学術論文誌 / Journals

1.  Y. Xiao, L. Xu, T. Tang, T. Ohtsuki, H. Sari, and G. Gui, "Robust and Efficient Specific Emitter Identification via Broad Learning-Based Mixture of Experts," IEEE Communications Letters, 2026 (accepted)

2. P. H. Rantelinggi, M. Bouazizi, and T. Ohtsuki, "Low-Data Cross-Environment Transfer Learning for Wi-Fi CSI-Based Human Activity Recognition: An Inductive Bias Perspective," IEEE Access, 2026 (accepted).

3. M. Nishikawa, S. Otaka, I. Seto, and T. Ohtsuki, "Digital-Only Phase Compensation for Secure Phase-Based Ranging in Vehicular RKE Systems," IEEE Open Journal of Vehicular Technology, early access, 2026.

4. X. Cheng, R. Li, S. Wang, T. Tang, T. Ohtsuki, and H. Sari, "LightSP: A Two-Timescale Deep-Broad Learning Framework for Cloud-Edge Spectrum Prediction," IEEE Internet of Things Journal, early access, 2026.

5. X. Zhou, X. Guan, H. Jiang, H. Chen, T. Ohtsuki and Z. Han, "Adaptive Hierarchical RAG-Empowered LLM for UAV Scheduling in Multi-Access Edge Computing," IEEE Transactions on Mobile Computing, early access, 2026.

6. J. Zhang, T. Tang, Q. Wang, Y. Yin, T. Ohtsuki and G. Gui, "Robust Radio Frequency Fingerprint Identification Under Temporal Domain Shifts Via Energy-Based Test-Time Adaptation," IEEE Transactions on Mobile Computing, early access, 2026.

7. C. Liu, F. Miao, J. Wu, S. Ma, H. Qi, Y. Yin, T. Ohtsuki, and G. Gui, "A Lightweight Dual-Branch Versatile Representation Framework for Multiple WiFi CSI Sensing Tasks," IEEE Internet of Things Journal, early access, 2026.

8. F. Miao, O. Takyu, L. Shan, O. Zhao, T. Ohtsuki and G. Gui, "CUTA-HAR: A Cross-User Temporal Attention Network for Wi-Fi CSI-Based Human Activity Recognition," IEEE Internet of Things Journal, early access, 2026.

9. H. Dong, X. Guan, N. Wang, H. Chen, T. Ohtsuki, Y. Zhang, and Z. Han, "Multi Policy SAC based Joint Optimization of Edge-Cloud Collaborative Task Offloading in Electric Vehicle Networks," IEEE Transactions on Vehicular Technology, early access, 2026.

10. J. Sun, X. Shen, H. Huang, R. Li, Q. Wang, H. Zhao, T. Ohtsuki, G. Gui, "VMamba-SLAM: Real-Time Dynamic Scene Adaptation Via Vision Mamba and Selective Feature Preservation for Enhanced Robotic Localization," IEEE Transactions on Vehicular Technology, early access, 2026.

11. Y. Wu, Q. Wang, T. Ohtsuki, D. Niyato, F. Adachi and G. Gui, "Generalized Wideband Power Amplifier Modeling for Vehicular Wireless Transceivers Using Kolmogorov-Arnold Convolutional Liquid Neural Networks," IEEE Transactions on Vehicular Technology, early access, 2026.

12. F. H. Panahi and T. Ohtsuki, "A Reinforcement Learning-Based Fire Warning and Suppression System Using Unmanned Aerial Vehicles," IEEE Transactions on Instrumentation and Measurement, early access, 2022.

13. Y. Qi, L. Wang, C. Zhao, P. T. Mathiopoulos, T. Ohtsuki, and F. Adachi, "SCRC-Net: A Structure-Constrained and Representation-Consistent Network for SAR Ship Classification," Pattern Recognition, vol. 180, article 114294, Dec. 2026.

14. L. Wang, H. Li, C. Zhao, P. Takis Mathiopoulos, T. Ohtsuki and F. Adachi, "Microamplitude Wave Detection Based on Nonlinear Representation and Underdetermined Mix Reconstruction," in IEEE Internet of Things Journal, vol. 13, no. 15, pp. 32820-32836, 1 Aug., 2026.

15. S. Wang, M. Bouazizi and T. Ohtsuki, "Dynamic Local Range–Doppler Map and Controlled Feature Fusion for Continuous Human Activity Recognition on Variable Multinode Radars," in IEEE Internet of Things Journal, vol. 13, no. 13, pp. 28851-28865, 1 July, 2026.

16. J. Sun, Y. Xutian, X. Shen, Y. Yin, H. Zhao, T. Ohtsuki, and G. Gui, "R²D-SLAM: A Real-Time and Robust Visual SLAM Framework for Autonomous Navigation in Dynamic Environments," in IEEE Transactions on Vehicular Technology, vol. 75, no. 7, pp. 14835-14848, July 2026.

17. R. Zhao, F. Miao, Y. Liu, Y. Yin, T. Ohtsuki, G. Gui, and F. Adachi, "Efficient Voxel-Based mmWave Radar HAR With Early Spatio–Temporal Fusion and a Compact 3-D–2-D Hybrid Network," in IEEE Internet of Things Journal, vol. 13, no. 10, pp. 21730-21739, 15 May, 2026.

18. T. Wang, G. Yang, L. Wang, P. Takis Mathiopoulos, T. Ohtsuki and M. Ouyang, "Twin-Timescale Traffic Signal Timing Method With Joint Communication Resource Allocation," in IEEE Internet of Things Journal, vol. 13, no. 9, pp. 18644-18660, 1 May, 2026.

19. X. Zhou, X. Guan, N. Wang, H. Chen, T. Ohtsuki and Y. Zhang, "Adaptive Task Offloading for Edge Computing in Internet of Energy via Retrieval-Augmented Generation," in IEEE Network, vol. 40, no. 3, pp. 219-228, May 2026.

20. Y. Yin, M. Bouazizi, B. Hu, G. Gui and T. Ohtsuki, "Integrated Deployment and Resource Allocation in Multilayer UAV-Enabled NOMA Wireless Caching Networks," in IEEE Internet of Things Journal, vol. 13, no. 7, pp. 14898-14911, 1 April, 2026.

21. L. Wang, B. Sun, C. Zhao, S. Mazhar, T. Ohtsuki, P. T. Mathiopoulos, and F. Adachi, "SAR Image Change Detection Based on Saliency Region Guidance and SIFT Keypoint Extraction," Pattern Recognition, vol. 172, article 112471, Apr. 2026.

22. X. Zhou, X. Guan, Y. Peng, Z. Zhang, X. Zhou, H. Chen, T. Ohtsuki, and Z. Han, "Depthwise-Attentive Hierarchical Cross-Modal Knowledge Distillation Network for Rail Surface Defect Detection," IEEE Internet of Things Journal, vol. 13, no. 6, pp. 10915–10928, 15 March 2026.

23. F. Miao, O. Takyu, L. Shan, Y. Yin, Ou Zhao, T. Ohtsuki, G. Gui, "MuECNet: A Lightweight Multiuser Enhanced Convolutional Architecture for Robust CSI-Based Human Activity Recognition in Real-World IoT Environments," in IEEE Internet of Things Journal, vol. 13, no. 6, pp. 12209-12219, 15 March, 2026.

24. L. Wang, J. E, C. Zhao, W. Gao, P. T. Mathiopoulos, and T. Ohtsuki, "Synthetic Aperture Radar Image Change Detection Based on Multi-Scale Deep Adaptive Convolution and Spatial-Frequency Dual-Domain Feature Extraction," Expert Systems with Applications, vol. 301, article 130431, Mar. 2026.

25. T. Wang, G. Yang, L. Wang, P. T. Mathiopoulos, T. Ohtsuki, and M. Ouyang, "Clock Asynchronous Traffic Signal Timing for Multi-Intersections Based on a Joint Traffic Prediction and Control Method," IEEE Transactions on Vehicular Technology, vol. 75, no. 1, pp. 1111–1125, Jan. 2026.

26. Y. Cao, T. Ohtsuki, S. Maghsudi and T. Q. S. Quek, "Memristor-Based Lightweight Meta Learning for Beam Prediction in Non-Stationary Environments," in IEEE Transactions on Cognitive Communications and Networking, vol. 12, pp. 9401–9414, 2026.

27. F. Shi, X. Zhang, T. Tang, Y. Wang, T. Ohtsuki, and G. Gui, "Robust Specific Emitter Identification Across Modulation Domains via Domain-Invariant Variational Autoencoding," IEEE Transactions on Information Forensics and Security, vol. 21, pp. 5880–5891, 2026.

28. F. Wen, X. Wang, G. Gui, T. Ohtsuki, D. Niyato and F. Adachi, "Fast DOD/DOA Estimation for Massive Conformal MIMO Arrays With Unknown Gain-Phase Errors," in IEEE Transactions on Wireless Communications, vol. 25, pp. 15866-15878, 2026.

29. J. He, X. Guan, H. Jiang, H. Chen, T. Ohtsuki and Z. Han, "Cloud–Edge Collaborative Digital Twin Modeling With Point Cloud Sampling in Smart City," in IEEE Transactions on Network Science and Engineering, vol. 13, pp. 8872-8891, 2026.

30. Z. He, Y. Yin, M. Bouazizi, T. Ohtsuki, D. Niyato and G. Gui, "Neural Approaches to Wi-Fi CSI-Based Human Activity Recognition: Architectures and Generalization," in IEEE Transactions on Cognitive Communications and Networking, vol. 12, pp. 7186-7200, 2026.

31. W. Li, Y. Cao, M. Bouazizi, T. Ohtsuki and S. Mumtaz, "Secrecy Rate Enhancement for Active RIS-Assisted MISO Wiretap Systems: A QoS-Aware Optimization Approach," in IEEE Wireless Communications Letters, vol. 15, pp. 2398-2402, 2026.

32. G. Lu, S. Wang, T. Ohtsuki, H. Sari and G. Gui, "Interpretability-Oriented UAV Recognition via Frequency-Aware Networks: A Coarse-to-Fine Framework for Enhanced Accuracy and Insight," in IEEE Transactions on Information Forensics and Security, vol. 21, pp. 3312-3324, 2026.

33. L. Ganeshkumar, R. Ramachandran and T. Ohtsuki, "Long-Term Sum-Rate Maximization in Irregular RIS-Aided V2X Communications Using Lyapunov Optimization," in IEEE Open Journal of the Communications Society, vol. 7, pp. 2446-2463, 2026.

34. Y. Wang, Z. Cai, T. Tang, T. Ohtsuki and G. Gui, "Toward Robust Radio Frequency Fingerprint Identification: A Federated Learning Framework With Feature Alignment," in IEEE Transactions on Information Forensics and Security, vol. 21, pp. 2641-2651, 2026.

35. G. Liu, Y. Cao, T. Ohtsuki, J. He and S. Mumtaz, "Generative Model-Aided Continual Learning for CSI Feedback in FDD mMIMO-OFDM Systems," in IEEE Signal Processing Letters, vol. 33, pp. 1013-1017, 2026.

36. L. Ganeshkumar, R. Ramachandran and T. Ohtsuki, "Sum-Rate Maximization in Irregular STAR-RIS-Driven V2X Systems," in IEEE Wireless Communications Letters, vol. 15, pp. 1504-1508, 2026.

37. L. Ganeshkumar, R. Ramachandran, and T. Ohtsuki, "Delay-Constrained Sum-Rate Maximization in STAR-RIS V2X Communications Using Lyapunov Framework," IEEE Access, vol. 14, pp. 857–874, 2026.

38. J. Sun, J. Shen, J. Tong, T. Tang, Y. Yin, T. Ohtsuki, and G. Gui, "Towards Robust and Real-Time State Estimation: A Neural Kalman Filter Framework with Mamba Architecture," IEEE Transactions on Vehicular Technology, vol. 75, no. 6, pp. 11545–11557, 2026.

39. C. Wang, X. Guan, N. Wang, H. Chen, T. Ohtsuki, and Z. Han, "Optimal Carbon Emission Reduction Modeling Considering Energy Consumer Satisfaction in Cyber-Physical Energy System," IEEE Internet of Things Journal, vol. 13, no. 4, pp. 6508–6521, 2026.

40. F. Miao, J. Lu, L. Shan, Z. Lu, O. Takyu, T. Ohtsuki, and G. Gui, "Lightweight Regularized Network for Indoor Human Multi-Task CSI Signal Recognition with Uncertainty Quantification," IEEE Internet of Things Journal, vol. 13, no. 4, pp. 6475–6484, 2026.

41. Y. Huang, Z. Wang, T. Tang, T. Ohtsuki, and G. Gui, "Dual-Stream Multi-Modal Fusion with Local-Global Attention for Remote Sensing Object Detection," IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 19, pp. 1691–1702, 2026.

42. A. A. Masud, X. Shi, M. Bouazizi, and T. Ohtsuki, "PCFEx: Point Cloud Feature Extraction for Graph Neural Networks," IEEE Internet of Things Journal, vol. 13, no. 4, pp. 5909–5917, 2026.

43. Z. Li, M. Bouazizi, T. Ohtsuki, and G. Gui, "Self-Supervised Federated Learning for UAV-IoT Systems with Dynamic Non-IID Data via Model Correlation," IEEE Internet of Things Journal, vol. 13, no. 4, pp. 5827–5841, 2026.

44. Q. Zhu, Y. Wang, T. Ohtsuki, S. Mao, D. Niyato, and G. Gui, "Bio-Inspired Dendritic Liquid Neural Network for Robust Near-Field Positioning in B5G/6G," IEEE Wireless Communications Letters, vol. 15, pp. 350–354, 2026.

45. Z. Xing,M. Bouazizi,and T. Ohtsuki, "Beyond Contact: An Open-Set Biometric Identification System Using Radar-Extracted Heart Signals," IEEE Journal of Biomedical and Health Informatics, vol. 30, no. 3, pp. 2718–2731, 2026.

46. Y. Cao, X. Wu, J. He, T. Ohtsuki, and T.Q.S. Quek, "Coverage and Rate Performance Analysis of Multi-RIS-Assisted Dual-Hop mmWave Networks," IEEE Transactions on Wireless Communications, vol. 25, pp. 3137–3152, 2026.

47. C. Liu, G. Gui, Y. Wang, T. Ohtsuki, D. Niyato, and X. S. Shen, "A Comprehensive Survey on Self-Supervised Learning for Specific Emitter Identification," IEEE Communications Surveys & Tutorials, vol. 28, pp. 1749–1775, 2026.

48. F. Yang, M. Li, K. Wang, P. Si, T. Ohtsuki, and F. R. Yu, "Handover Optimization for UAV-Assisted LEO Satellite Networks Based on IPPO and Three-Sided Matching Theory," IEEE Internet of Things Journal, vol. 13, no. 1, pp. 152–166, 2026.

49. Z. Zhao, C. Wu, Y. Lin, L. Zhong, Y. Ji, T. Ohtsuki, and M. Bennis, "LRGD: Low-Rank Guided Diffusion for Robust Image Transmission in Semantic Communication," IEEE Transactions on Cognitive Communications and Networking, vol. 12, pp. 2439–2454, 2026.

50. G. Pan, X. Guan, N. Wang, Y. Liu, H. Wu, H. Chen, T. Ohtsuki, and Z. Han, "Mobile Edge Computing based Intelligent Charging Strategy for Electric Vehicles in Cyber Physical Energy System," IEEE Transactions on Vehicular Technology, vol. 75, no. 2, pp. 3205–3221, 2026.

51. N. Ji, Y. Zhang, T. Ohtsuki, G. Gui, C. Yuen, and F. Adachi, "Generative Augmented Cascade Broad Learning for Lightweight Multi-Band Spectrum Prediction," IEEE Transactions on Cognitive Communications and Networking, vol. 12, pp. 382–394, 2026.

52. V. Ganapathy, R. Ramachandran, and T. Ohtsuki, "Improved Deep Learning Methods for Beamforming in Secure SWIPT Networks," IEEE Transactions on Green Communications and Networking, vol. 9, no. 3, pp. 962–976, Sept. 2025.

53. J. Liu, H. Zhao, P. Han, G. Gui, T. Ohtsuki, H. Sari, and F. Adachi, "An Ensemble Learning-Based Fault Detection Method for Vehicular Ad Hoc Networks in Intelligent Transportation Systems," IEEE Transactions on Vehicular Technology, vol. 74, no. 3, pp. 5114-5124, March 2025.

54. F. Miao, Y. Huang, Z. Lu, T. Ohtsuki, G. Gui, and H. Sari, "Wi-Fi Sensing Techniques for Human Activity Recognition: Brief Survey, Potential Challenges, and Research Directions," ACM Computing Surveys, Vol. 57, Issue 5, No. 107, pp. 1–30, Jan. 2025.

55. S. Wang, M. Bouazizi, Siyuan Yang, and T. Ohtsuki, "Accurate Cardiac Duration Detection for Remote Blood Pressure Estimation Using mm-Wave Doppler Radar," Sensors, vol. 25, no. 3, 619, Jan. 2025.

56. K. Liu, M. Bouazizi, Z. Xing, and T. Ohtsuki, "A Comparison Study of Person Identification Using IR Array Sensors and LiDAR," Sensors, vol. 25, no. 1, 271, Jan. 2025.

57. L. Li, X. Yang, W. Wu, H. Wang, T. Ohtsuki, X. Fu, M. Pan, and X. Shen, "MobiLLM: Enabling On-Device Fine-Tuning of Billion-Sized LLMs via Server-Assisted Side-Tuning," IEEE Journal of Selected Topics in Signal Processing, vol. 19, no. 7, pp. 1251–1265, 2025.

58. J. Sun, H. Huang, X. Shen, H. Zhao, Y. Yin, T. Ohtsuki, and G. Gui, "DFusion-SLAM: A Lightweight Semantic Fusion Framework for Robust Visual SLAM in Dynamic Environments," IEEE Internet of Things Journal, vol. 12, no. 24, pp. 55682–55692, 2025.

59. Z. Xiao, Y. Cao, M. Bouazizi, T. Ohtsuki, and S. Mumtaz, "A Deep Transfer Learning-Based Low-Overhead Beam Prediction in Vehicle Communications," IEEE Wireless Communications Letters, vol. 14, no. 12, pp. 4147–4151, 2025.

60. M. Bouazizi, S. Yang, L. Zhaojie, Y. Yin, and T. Ohtsuki, "Reinforcement Learning with Clustering Optimization for Antenna Parameter Adjustment in HAPS Networks," IEEE Access, vol. 13, pp. 172062–172079, 2025.

61. Y. Cao, G. Liu, T. Ohtsuki, H. H. Yang, and T. Q. S. Quek, "Distributed Gossip-GAN for Low-Overhead CSI Feedback Training in FDD mMIMO-OFDM Systems," IEEE Internet of Things Journal, vol. 12, no. 19, pp. 40176–40189, 2025.

62. C. Liu, F. Miao, Y. Chen, J. Wu, H. Wang, T. Tang, T. Ohtsuki, G. Gui, and H. Sari, "Lightweight CSI-Based Human Activity Recognition for Multi-Task IoT Applications," IEEE Internet of Things Journal, vol. 12, no. 17, pp. 35817–35827, 2025.

63. F. Yang, M. Li, T. Ohtsuki, W. Wu, P. Si, and T. Sun, "NoisyNet-DDQN-Based Sequential Handoff Algorithm for UAV Networks With End-to-End Network Slicing," IEEE Transactions on Vehicular Technology, vol. 74, no. 12, pp. 19496–19512, 2025.

64. R. Ariyoshi, A. Li, M. Hasegawa, and T. Ohtsuki, "Energy-Efficient Resource Allocation Scheme Based on Reinforcement Learning in Distributed LoRa Networks," Sensors, vol. 25, no. 16, article 4996, 2025.

65. P. H. Rantelinggi, X. Shi, M. Bouazizi, and T. Ohtsuki, "A Novel Deep Learning Model for Human Skeleton Estimation Using FMCW Radar," Sensors, vol. 25, no. 13, article 3909, 2025.

66. W. Lu, X. Jiang, Y. Cao, T. Ohtsuki, and E. Bai, "Model-Driven Meta-Learning-Aided Fast Beam Prediction in Millimeter-Wave Communications," Electronics, 14(13), 2734, 2025.

67. X. Zhou, X. Guan, N. Wang, H. Chen, T. Ohtsuki, Y. Zhang, and Z. Han, "Large Model Empowered Task Offloading for Multi- Access Edge Computing in the Internet of Vehicles," IEEE Transactions on Vehicular Technology, vol. 74, no. 11, pp. 18012–18025, 2025.

68. X. Shi, M. Bouazizi, T. Ohtsuki, "mmPoint-Attention: A Unified Attention Framework for Human Pose and Activity Recognition from mmWave Radar Point Clouds," IEEE Sensors Journal, vol. 25, no. 14, pp. 26794–26805, 2025.

69. X. Zhang, Y. Wang, T. Ohtsuki, G. Gui, C. Yuen, M. D. Renzo, and H. Sari, "Malware Traffic Classification via Expandable Class Incremental Learning with Architecture Search," IEEE Transactions on Information Forensics and Security, vol. 20, pp. 6074–6085, 2025.

70. C. Zheng, M. Bouazizi, T. Ohtsuki, M. Kitazawa, T. Horigome, T. Kishimoto, "Face Mesh for Dementia Detection: Evaluating Data Augmentation in Deep Learning and Traditional Machine Learning," IEEE Access, vol. 13, pp. 104501–104520, 2025.

71. G. Liu, Y. Cao, T. Ohtsuki, and T. Q.S. Quek, "Self-supervised Learning Enhanced Channel Estimation in Massive MIMO System with Low-Resolution ADCs," IEEE Wireless Communications Letters, vol. 14, no. 7, pp. 2209–2213, 2025.

72. X. Zhou, X. Guan, D. Sun, X. Zhang, Z. Zhang, and T. Ohtsuki, "Heterogeneous Multi-Agent Deep Reinforcement Learning Based Low Carbon Emission Task Offloading in Mobile Edge Computing," Computer Communications, vol. 234, article 108089, 2025.

73. W. Dai, S. Yang, Y. Yin, M. Bouazizi, and T. Ohtsuki, "A Clustering-Aided Optimization Algorithm for Antenna Beamforming in Multi-Cell HAPS Systems," IEEE Internet of Things Journal, vol. 12, no. 15, pp. 30168–30184, 2025.

74. J. E, L. Wang, C. Zhao, P. T. Mathiopoulos, T. Ohtsuki, and F. Adachi, "SAR Images Change Detection Based on Attention Mechanism-Convolutional Wavelet Neural Network," IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 18, pp. 12133–12149, 2025.

75. S. Yang, T. Ohtsuki, and X. Jiang, "Joint Angle-Based User Selection and Multiagent Reinforcement Learning for Dynamic Beamforming in HAPS-Assisted IoT Vehicular Networks," IEEE Internet of Things Journal, vol. 12, no. 14, pp. 27075–27083, 2025.

76. Z. He, M. Bouazizi, G. Gui, and T. Ohtsuki, "A Cross-subject Transfer Learning Method for CSI-based Wireless Sensing," IEEE Internet of Things Journal, vol. 12, no. 13, pp. 23946–23960, 2025.

77. Z. He, M. Bouazizi, Y. Yin, G. Gui, and T. Ohtsuki, "Robust Cross-Scenario WiFi Wireless Sensing Using Incremental Learning and Elastic Weight Consolidation Loss," IEEE Internet of Things Journal, vol. 12, no. 13, pp. 24288–24299, 2025.

78. H. Zhangcheng and T. Ohtsuki, "Loss-Adapter: Addressing Network Packet Loss in Distributed Inference for Lossy IoT Environments," IEEE Internet of Things Journal, vol. 12, no. 12, pp. 22048–22057, 2025.

79. X. Fu, Y. Wang, Y. Lin, T. Ohtsuki, B. Adebisi, G. Gui, and H. Sari, "Toward Collaborative and Cross-Environment UAV Classification: Federated Semantic Regularization," in IEEE Transactions on Information Forensics and Security, vol. 20, pp. 1624-1635, 2025.

80. R. Li, Z. Yao, Y. Wang, Y. Lin, G. Gui, T. Ohtsuki, and H. Sari, "Behavioral Modeling of Power Amplifiers Leveraging Multi-Channel Convolutional Long Short-Term Deep Neural Network," IEEE Transactions on Vehicular Technology, vol. 74, no. 7, pp. 11456–11460, 2025.

81. M. Bouazizi, K. Feghoul, S. Wang, Y. Yin, and T. Ohtsuki, "A Non-Invasive Approach for Facial Action Unit Extraction and Its Application in Pain Detection," Bioengineering 2025, 12(2), 195.

82. Y. Wang, T. Ohtsuki, Z. Sun, D. Niyato, X. Wang, and G. Gui, "Avoiding Shortcuts: Enhancing Channel-Robust Specific Emitter Identification via Single-Source Domain Generalization," IEEE Transactions on Wireless Communications, vol. 24, no. 4, pp. 3163–3176, 2025.

83. X. Meng, M. Bouazizi, Z. Li, T. Ohtsuki, "Indoor Human Activity Recognition using Multiple Dynamic Nonlinear Mapping Applied to 3D LiDAR-Collected Data," IEEE Internet of Things Journal, vol. 12, no. 11, pp. 16797–16812, 2025.

84. T. Okunishi, C. Zheng, M. Bouazizi, T. Ohtsuki, M. Kitazawa, T. Horigome, T. Kishimoto, "Dementia and MCI Detection Based on Comprehensive Facial Expression Analysis From Videos During Conversation," IEEE Journal of Biomedical and Health Informatics, vol. 29, no. 5, pp. 3537–3548, 2025.

85. H. Hirose, S. Yang, T. Ohtsuki, and M. Bouazizi, "Deep Learning-based Channel Estimation to Mitigate Channel Aging in Massive MIMO with Pilot Contamination," IEEE Access, vol. 13, pp. 1834–1845, 2025.

86. C. Zhao, K. Li, L. Wang, T. Ohtsuki, and F. Adachi, "A Rapid SAR Image Simulation Method for Ship Wakes Coupled with Sea Waves Using Fluid Velocity Potential," IEEE Signal Processing Letters, vol. 32, pp. 271–275, 2025.

87. Y. Wang, H. Zhao, T. Ohtsuki, H. Sari, and G. Gui, "Regularized Multi-Label Learning Empowered Joint Activity Recognition and Indoor Localization With CSI Fingerprints," IEEE Transactions on Wireless Communications, vol. 23, no. 11, pp. 16865–16874, Nov. 2024.

88. S. Xu, X. Guan, Y. Peng, Y. Liu, C. Cui, H. Chen, T. Ohtsuki, and Z. Han, "Deep Reinforcement Learning Based Data-Driven Mapping Mechanism of Digital Twin for Internet of Energy," in IEEE Transactions on Network Science and Engineering, vol. 11, no. 4, pp. 3876–3890, July-Aug. 2024.

89. V. Ganapathy, R. Ramachandran, and T. Ohtsuki, "Deep Learning Methods for Secure IoT SWIPT Networks," IEEE Internet of Things Journal, vol. 11, no. 11, pp. 19657-19677, 1 June, 2024.

90. K. Xu, X. Zhang, Y. Wang, T. Ohtsuki, B. Adebisi, H. Sari, and G. Gui, "Self-Supervised Learning Malware Traffic Classification Based on Masked Autoencoder," IEEE Internet of Things Journal, vol. 11, no. 10, pp. 17330–17340, May 2024.

91. H. Zhao, Q. Hao, H. Huang, G. Gui, T. Ohtsuki, H. Sari, and F. Adachi, "Online Trajectory Optimization for Energy-Efficient Cellular-Connected UAVs With Map Reconstruction," in IEEE Transactions on Vehicular Technology, vol. 73, no. 3, pp. 3445-3456, March 2024.

92. Y. Cao, S. Maghsudi, T. Ohtsuki, and T.Q.S. Quek, "Mobility-Aware Routing and Caching in Small Cell Networks using Federated Learning," IEEE Transactions on Communications, vol. 72, no. 2, pp. 815-829, Feb. 2024.

93. M. Hua, Y. Zhang, J. Sun, B. Adebisi, T. Ohtsuki, G. Gui, H. C. Wu, and H. Sari, "Specific Emitter Identification Using Adaptive Signal Feature Embedded Knowledge Graph," IEEE Internet of Things Journal, vol. 11, no. 3, pp. 4722–4734, Feb. 2024.

94. Y. Shibata, W. Takabatake, K. Hoshino, A. Nagate and T. Ohtsuki, "HAPS Cell Design Method for Coverage Extension Considering Coexistence on Terrestrial Mobile Networks," in IEEE Access, vol. 12, pp. 55506-55520, 2024.

95. C. Ye, S. Xu, Z. He, Y. Yin, T. Ohtsuki, and G. Gui, "Non-Contact Cross-Person Activity Recognition by Deep Metric Ensemble Learning," Bioengineering, vol. 11, no. 11, 1124, 2024.

96. G. Pan, X. Guan, H. Jiang, Y. Liu, H. Wu, H. Chen, T. Ohtsuki, and Z. Han, "Joint intelligent optimizing economic dispatch and electric vehicles charging in 5G vehicular networks," Computer Networks, vol. 255, article 110872, 2024.

97. S. Nakatani, M. Bouazizi, and T. Ohtsuki, "Heart Rate Estimation Considering Reconstructed Signal Features Based on VMD via MIMO FMCW Radar," Sensors, vol. 24, no. 21, article 6809, 2024.

98. W. Shao, M. Bouazizi, and T. Ohtsuki, "Depth Video-Based Secondary Action Recognition in Vehicles via CNN and Bi-LSTM with Spatial Enhanced Attention Mechanism," Sensors, vol. 24, no. 20, article 6604, 2024.

99. K. Liu, Z. Xing, M. Bouazizi, and T. Ohtsuki, "A Comparative Study of Methods of Person Identification Using Radar-Extracted Heartbeat Signals," IEEE Access, vol. 12, pp. 152196–152211, 2024.

100. W. Takabatake, Y. Shibata, K. Hoshino, and T. Ohtsuki, "Time-Efficient Neural-Network-Based Dynamic Area Optimization Algorithm for High-Altitude Platform Station Mobile Communications," Future Internet 2024, 16(9), 332.

101. C. Zhao, H. Liu, L. Wang, T. Ohtsuki, and F. Adachi, "SAR Image Wake Detection Based on Pseudo-Siamese Structure and Multidomain Feature Fusion," IEEE Geoscience and Remote Sensing Letters, vol. 21, article 4015605, 2024.

102. W. Shao, M. Bouazizi, X. Meng, and T. Ohtsuki, "People Identification in Private Car Using 3D LiDAR With Generative Image Inpainting and YOLOv5," IEEE Access, vol. 12, pp. 38258–38274, 2024.

103. M. Bouazizi, A. L. Mora, K. Feghoul, and T. Ohtsuki, "Activity Detection in Indoor Environments Using Multiple 2D Lidars," Sensors, vol. 24, no. 2, article 626, 2024.

104. Z. Li, M. Bouazizi, T. Ohtsuki, M. Ishii, and E. Nakahara, "Toward Building Trust in Machine Learning Models: Quantifying the Explainability by SHAP and References to Human Strategy," IEEE Access, vol. 12, pp. 11010–11023, 2024.

105. M. Bouazizi, C. Zheng, S. Yang, and T. Ohtsuki, "Dementia Detection from Speech: What if Language Models Are not the Answer?" Information 2024, 15(1), 2; https://doi.org/10.3390/info15010002.

106. X. Fu, Y. Wang, Y. Lin, T. Ohtsuki, G. Gui, and H. Sari, "Toward Robust Open-Set Radiofrequency Signal Identification in Internet of Things Using Hypersphere Manifold Embedding," in IEEE Internet of Things Journal.

107. X. Zhang, Q. Wang, M. Qin, Y. Wang, T. Ohtsuki, B. Adebisi, H. Sari, and G. Gui, "Enhanced Few-Shot Malware Traffic Classification via Integrating Knowledge Transfer with Neural Architecture Search," IEEE Transactions on Information Forensics and Security.

108. X. Xu, X. Zhang, Q. Zhang, Y. Wang, B. Adebisi, T. Ohtsuki, H. Sari, G. Gui, "Advancing Malware Detection in Network Traffic With Self-Paced Class Incremental Learning," in IEEE Internet of Things Journal.

109. Y. Yin, T. Ohtsuki, G. Gui, C. Yuen, H. -C. Wu and H. Sari, "Joint Optimization of User Pairing, Power Allocation and Content Server Deployment in NOMA-Assisted Wireless Caching Networks," in IEEE Transactions on Vehicular Technology, vol. 72, no. 12, pp. 16866-16870, Dec. 2023.

110. C. Sun, X. Xiong, Z. Zhai, W. Ni, T. Ohtsuki, and X. Wang, "Max-Min Fair 3D Trajectory Design and Transmission Scheduling for Solar-Powered Fixed-Wing UAV-Assisted Data Collection," IEEE Transactions on Wireless Communications, vol. 22, no. 12, pp. 8650–8665, Dec. 2023.

111. Y. Cao, T. Ohtsuki, S. Maghsudi, and T. Q. S. Quek, "Deep Learning and Image Super-Resolution-Guided Beam and Power Allocation for mmWave Networks," IEEE Trans. on Vehicular Technology, vol. 72, no. 11, pp. 15080-15085, Nov. 2023.

112. R. Yoshizawa, K. Yamamoto and T. Ohtsuki, "Investigation of Data Leakage in Deep-Learning-Based Blood Pressure Estimation Using Photoplethysmogram/Electrocardiogram," IEEE Sensors Journal, vol. 23, no. 12, pp. 13311-13318, 15 June, 2023.

113. R. Zhao, Y. Wang, Z. Xue, T. Ohtsuki, B. Adebisi and G. Gui, "Semisupervised Federated-Learning-Based Intrusion Detection Method for Internet of Things," in IEEE Internet of Things Journal, vol. 10, no. 10, pp. 8645-8657, May, 2023.

114. Y. Hu, X. Guan, B. Hu, Y. Liu, H. Chen and T. Ohtsuki, "Distributed Feature Selection Considering Data Pricing Based on Edge Computing in Electricity Spot Markets," in IEEE Internet of Things Journal, vol. 10, no. 3, pp. 2231-2244, 1 Feb., 2023.

115. T. Ohtsuki, "(Invited Paper) Machine Learning in 6G Wireless Communications," IEICE Transactions on Communications, Vol. E106-B, No.2, pp. 75–83, Feb. 2023.

116. X. Shi, N. Niida, K. Yamamoto, T. Ohtsuki, Y. Matsui, and K. Owada, "A Robust Approach Assisted by Signal Quality Assessment for Fetal Heart Rate Estimation from Doppler Ultrasound Signal," Sensors, vol. 23, no. 24, article 9698, 2023.

117. R. Zhu, X. Guan, J. Zheng, N. Wang, H. Jiang, C. Cui, and T. Ohtsuki, "DRL based low carbon economic dispatch by considering power transmission safety limitations in internet of energy," Internet of Things, vol. 24, article 100979, 2023.

118. V. Ganapathy, R. Ramachandran, and T. Ohtsuki, "Resource Allocation for Secure MIMO-SWIPT Systems in the Presence of Multi-Antenna Eavesdropper in Vehicular Networks," Sensors, vol. 23, no. 19, article 8069, 2023.

119. C. Zheng, M. Bouazizi,T. Ohtsuki, M. Kitazawa, T. Horigome, and T. Kishimoto, "Detecting Dementia from Face-Related Features with Automated Computational Methods," Bioengineering, vol. 10, no. 7, article 862, 2023.

120. F. H. Panahi and T. Ohtsuki, "Intelligent Cellular Offloading with VLC-enabled Unmanned Aerial Vehicles," IEEE Internet of Things Journal, vol. 10, no. 20, pp. 17718–17733, 2023.

121. M. Bouazizi, A.-L. Mora, and T. Ohtsuki, "A 2D Lidar-Equipped Unmanned Robot-Based Approach for Indoor Human Activity Detection," Sensors, vol. 23, no. 5, article 2534, 2023.

122. K. Endo, T. Ishikawa, K. Yamamoto, and T. Ohtsuki, "Multi-Person Position Estimation Based on Correlation Between Received Signals Using MIMO FMCW Radar," in IEEE Access, vol. 11, pp. 2610-2620, 2023.

123. S. Yang, M. Bouazizi, T. Ohtsuki, Y. Shibata, W. Takabatake, K. Hoshino, and A. Nagate, "Deep Reinforcement Learning Evolution Algorithm for Dynamic Antenna Control in Multi-Cell Configuration HAPS System," Future Internet 2023, 15(1), 34.

124. F. H. Panahi and T. Ohtsuki, "An Intelligent Path Planning Mechanism for Firefighting in Wireless Sensor and Actor Networks," IEEE Internet of Things Journal, vol. 10, no. 11, pp. 9646–9661, 2023.

125. C. Zhao, L. Ma, L. Wang, T. Ohtsuki, P. T. Mathiopoulos, and Y. Wang, "SAR Image Change Detection in Spatial-Frequency Domain Based on Attention Mechanism and Gated Linear Unit," IEEE Geoscience and Remote Sensing Letters, vol. 20, article 4002205, 2023.

126. X. Shi, K. Yamamoto, T. Ohtsuki, Y. Matsui, and K. Owada, "Unsupervised Learning-Based Non-Invasive Fetal ECG Multi-Level Signal Quality Assessment," Bioengineering, vol. 10, no. 1, article 66, 2023.

127. S. Nakatani, K. Yamamoto, and T. Ohtsuki, "Fetal Arrhythmia Detection based on Labeling Considering Heartbeat Interval," Bioengineering, 2023, 10(1), 48.

128. L. Wang, C. Zhao, P.T. Mathiopoulos, and T. Ohtsuki, "Heart Action Monitoring From Pulse Signals Using A Growing Hybrid Polynomial Network," Engineering Applications of Artificial Intelligence, vol. 117, article 105584, 2023.

129. M. Bouazizi, K. Yamamoto, K. Endo, and T. Ohtsuki, "A Novel Approach for Heartbeat Rate Estimation using 3-D Lidar and Multi-Beam MIMO Doppler Radar," in IEEE Sensors Journal.

130. D. Shi, L. Li, T. Ohtsuki, M. Pan, Z. Han and H. V. Poor, "Make Smart Decisions Faster: Deciding D2D Resource Allocation via Stackelberg Game Guided Multi-Agent Deep Reinforcement Learning," in IEEE Transactions on Mobile Computing, vol. 21, no. 12, pp. 4426-4438, 1 Dec. 2022.

131. Z. He, J. Yin, Y. Wang, G. Gui, B. Adebisi, T. Ohtsuki, H. Gacanin, and H. Sari, "Edge Device Identification Based on Federated Learning and Network Traffic Feature Engineering," IEEE Transactions on Cognitive Communications and Networking, vol. 8, no. 4, pp. 1898–1909, Dec. 2022.

132. T. Nakamura, M. Bouazizi, K. Yamamoto and T. Ohtsuki, "Wi-Fi-Based Fall Detection Using Spectrogram Image of Channel State Information," in IEEE Internet of Things Journal, vol. 9, no. 18, pp. 17220-17234, 15 Sept., 2022.

133. I. Seto, S. Otaka, H. Yoshida, K. Nonin, M. Nishikawa, T. Kato, Y. Nito, H. Ishiwata, and T. Ohtsuki, "Sub-GHz Two-Way Ranging Based on Phase Detection for Remote Keyless Entry Systems," IEEE Transactions on Vehicular Technology, vol. 71, no. 9, pp. 9705–9720, Sept. 2022.

134. R. Chen, L. Li, Y. Ma, Y. Gong, Y. Guo, T. Ohtsuki, and M. Pan, "Constructing Mobile Crowdsourced COVID-19 Vulnerability Map With Geo-Indistinguishability," IEEE Internet of Things Journal, vol. 9, no. 18, pp. 17403–17416, Sept. 2022.

135. M. Bouazizi, C. Ye and T. Ohtsuki, "2-D LIDAR-Based Approach for Activity Identification and Fall Detection," in IEEE Internet of Things Journal, vol. 9, no. 13, pp. 10872-10890, 1 July, 2022.

136. R. Zhao, J. Yin, Z. Xue, G. Gui, B. Adebisi, T. Ohtsuki, H. Gacanin, and H. Sari, "A Novel Intrusion Detection Method Based on Lightweight Neural Network for Internet of Things," IEEE Internet of Things Journal, vol. 9, no. 12, pp. 9960-9972, 15 June, 2022.

137. G. Fan, J. Sun, G. Gui, H. Gacanin, B. Adebisi and T. Ohtsuki, "Fully Convolutional Neural Network Based CSI Limited Feedback for FDD Massive MIMO Systems," in IEEE Transactions on Cognitive Communications and Networking, vol. 8, no. 2, pp. 672-682, June 2022.

138. K. A. Muthukumar, M. Bouazizi, and T. Ohtsuki, "An Infrared Array Sensor-Based Approach for Activity Detection, Combining Low-Cost Technology with Advanced Deep Learning Techniques," Sensors, 2022 May 20; 22(10): 3898.

139. H. Zhao, J. Tang, B. Adebisi, T. Ohtsuki, G. Gui, and H. Zhu, "An Adaptive Vehicle Clustering Algorithm Based on Power Minimization in Vehicular Ad-hoc Networks," IEEE Trans. on Vehicular Technology, vol. 71, no. 3, pp. 2939-2948, March 2022.

140. X. Fu, G. Gui, Y. Wang, T. Ohtsuki, B. Adebisi, H. Gacanin, and F. Adachi, "Lightweight Automatic Modulation Classification Based on Decentralized Learning," IEEE Transactions on Cognitive Communications and Networking, vol. 8, no. 1, pp. 57–70, Mar. 2022.

141. Y. Liu, X. Guan, Y. Peng, H. Chen, T. Ohtsuki, and Z. Han, "Blockchain Based Task Offloading for Edge Computing on Low-Quality Data via Distributed Learning in the Internet of Energy," in IEEE Journal on Selected Areas in Communications, vol. 40, no. 2, pp. 657-676, Feb. 2022.

142. K. Endo, K. Yamamoto, and T. Ohtsuki, "A Denoising Method Using Deep Image Prior to Human-Target Detection Using MIMO FMCW Radar," Sensors 2022, 22(23), 9401.

143. C. Zheng, M. Bouazizi and T. Ohtsuki, "An Evaluation on Information Composition in Dementia Detection Based on Speech," in IEEE Access, vol. 10, pp. 92294–92306, 2022.

144. S. Yang, M. Bouazizi, Y. Cao, and T. Ohtsuki, "Inter-User Distance Estimation Based on a New Type of Fingerprint in Massive MIMO System for COVID-19 Contact Detection," Sensors, vol. 22, no. 16, article 6211, 2022.

145. Y. Shibata, W. Takabatake, K. Hoshino, A. Nagate and T. Ohtsuki, "Two-Step Dynamic Cell Optimization Algorithm for HAPS Mobile Communications," IEEE Access, vol. 10, pp. 68085-68098, 2022.

146. M. Bouazizi, C. Ye, and T. Ohtsuki, "Low-Resolution Infrared Array Sensor for Counting and Localizing People Indoors: When Low End Technology Meets Cutting Edge Deep Learning Techniques," Information, vol. 13, no. 3, article 132, 2022.

147. L. Wang, T. Ohtsuki, K. Owada, N. Honda, and H. Hayashi, "A Multi-Layer Hybrid Network with Its Application in Fetal Heart Rate Monitoring," IEEE Signal Processing Letters, vol. 29, pp. 1207-1211, 2022.

148. M. Bouazizi and T. Ohtsuki, "Sarcasm Over Time and Across Platforms: Does the Way we Express Sarcasm Change?," IEEE Access, vol. 10, pp. 55958-55987, 2022.

149. T. Kitagawa, K. Yamamoto, K. Endo and T. Ohtsuki, "Multibeam Doppler Sensor-Based Non-Contact Heartbeat Detection Using Beam Diversity," in IEEE Access, vol. 10, pp. 16242-16253, 2022.

150. L. Sui, X. Guan, C. Cui, H. Jiang, H. Pan and T. Ohtsuki, "Graph Learning Empowered Situation Awareness in Internet of Energy with Graph Digital Twin," in IEEE Transactions on Industrial Informatics.

151. W. Shi, Y. Sun, M. Liu, H. Xu, G. Gui, T. Ohtsuki, B. Adebisi, H. Gacanin, and F. Adachi, "Joint UL/DL Resource Allocation for UAV-Aided Full-Duplex NOMA Communications," IEEE Transactions on Communications, vol. 69, no. 12, pp. 8474-8487, Dec. 2021.

152. J. Zeng, J. Sun, G. Gui, B. Adebisi, T. Ohtsuki, H. Gacanin, and H. Sari, "Downlink CSI Feedback Algorithm with Deep Transfer Learning for FDD Massive MIMO Systems," IEEE Transactions on Cognitive Communications and Networking, vol. 7, no. 4, pp. 1253-1265, Dec. 2021.

153. Y. Xu, G. Gui, T. Ohtsuki, H. Gacanin, B. Adebisi, H. Sari, and F. Adachi, "Robust Resource Allocation for Two-Tier HetNets: An Interference-Efficiency Perspective," IEEE Transactions on Green Communications and Networking, vol. 5, no. 3, pp. 1514-1528, Sept. 2021.

154. J. Wang, G. Gui, T. Ohtsuki, B. Adebisi, H. Gacanin and H. Sari, "Compressive Sampled CSI Feedback Method Based on Deep Learning for FDD Massive MIMO Systems," in IEEE Transactions on Communications, vol. 69, no. 9, pp. 5873-5885, Sept. 2021.

155. X. Song, J. Wang, J. Wang, G. Gui, T. Ohtsuki, H. Gacanin, and H. Sari, "SALDR: Joint Self-Attention Learning and Dense Refine for Massive MIMO CSI Feedback with Multiple Compression Ratios," IEEE Wireless Communications Letters, vol. 10, no. 9, pp. 1899-1903, Sept. 2021.

156. Y. Wang, G. Gui, H. Gacanin, T. Ohtsuki, O. A. Dobre and H. V. Poor, "An Efficient Specific Emitter Identification Method Based on Complex-Valued Neural Networks and Network Compression," in IEEE Journal on Selected Areas in Communications, vol. 39, no. 8, pp. 2305–2317, Aug. 2021.

157. W. Hou, J. Sun, G. Gui, T. Ohtsuki, A.M. Elbir, H. Gacanin, and H. Sari, "Federated Learning for DL-CSI Prediction in FDD Massive MIMO Systems," IEEE Wireless Communications Letters, vol. 10, no. 8, pp. 1810-1814, Aug. 2021.

158. R. Zhao, J. Yin, Z. Xue, G. Gui, B. Adebisi, T. Ohtsuki, H. Gacanin and H. Sari, "An Efficient Intrusion Detection Method Based on Dynamic Autoencoder," IEEE Wireless Communications Letters, vol. 10, no. 8, pp. 1707-1711, Aug. 2021.

159. Y. Wang, G. Gui, T. Ohtsuki, and F. Adachi, "Multi-Task Learning for Generalized Automatic Modulation Classification Under Non-Gaussian Noise with Varying SNR Conditions," IEEE Trans. on Wireless Communications, vol. 20, no. 6, pp. 3587-3596, June 2021.

160. C. Ye and T. Ohtsuki, "Spectral Viterbi Algorithm for Contactless Wide-Range Heart Rate Estimation With Deep Clustering," in IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 5, pp. 2629-2641, May 2021.

161. D. Fang, X. Guan, Y. Peng, H. Chen, T. Ohtsuki, and Z. Han, "Distributed Deep Reinforcement Learning for Renewable Energy Accommodation Assessment With Communication Uncertainty in Internet of Energy," IEEE Internet of Things Journal, vol. 8, no. 10, pp. 8557–8569, May 2021.

162. H. Echigo, Y. Cao, M. Bouazizi, and T. Ohtsuki, "A Deep Learning-based Low Overhead Beam Selection in mmWave Communications," IEEE Trans. on Vehicular Technology, vol. 70, no. 1, pp. 682-691, Jan. 2021.

163. M. Ishii, T. Maki, K. Oomori, and T. Ohtsuki, "Contact center DX by data analysis -When, who, where operators call to-," IPSJ Trans. on Digital Practice, Vol.2 No.1, Jan. 2021.

164. J. Luo, M. Bouazizi, and T. Ohtsuki, "Data Augmentation for Sentiment Analysis Using Sentence Compression-based SeqGAN with Data Screening," IEEE Access, vol. 9, pp. 99922-99931, 2021.

165. K. A. Muthukumar, M. Bouazizi and T. Ohtsuki, "A Novel Hybrid Deep Learning Model for Activity Detection Using Wide-Angle Low-Resolution Infrared Array Sensor," in IEEE Access, vol. 9, pp. 82563-82576, 2021.

166. F. H. Panahi and T. Ohtsuki, "Spectrum-Aware Energy Efficiency Analysis in K-Tier 5G HetNets," Electronics, vol. 10, no. 7, article 839, 2021.

167. A. Takahashi, O. Takyu, H. Fujiwara, T. Fujii, and T. Ohtsuki, "Overloaded Wireless MIMO Switching for Information Exchanging through Untrusted Relay in Secure Wireless Communication," IEICE Transactions on Communications, vol. E104.B, no. 10, pp. 1249–1259, 2021.

168. A. Yamada and T. Ohtsuki, "Discrete BP Polar Decoder using Information Bottleneck Method," IEEE Access, vol. 9, pp. 10645–10656, 2021.

169. Y. Cao and T. Ohtsuki, "Spatial Degrees of Freedom Exploration and Analog Beamforming Designs for Signature Spatial Modulation," IEICE Transactions on Communications, Vol. E104.B, No. 8, pp. 934-941, 2021.

170. H. Hirose, T. Ohtsuki, and G. Gui, "(invited paper) Deep Learning-based Channel Estimation for Massive MIMO Systems with Pilot Contamination," IEEE Open Journal of Vehicular Technology, vol. 2, pp. 67-77, 2021.

171. I. Sun, F. Liu, Y. Zhou, G. Gui, T. Ohtsuki, S. Guo, and F. Adachi, "Surveillance Plane Aided Air-Ground Integrated Vehicular Networks: Architectures, Applications, and Potential," IEEE Wireless Communications, vol. 27, no. 6, pp. 122-128, Dec. 2020.

172. Y. Kumar and T. Ohtsuki, "Influence and Mitigation of Pedestrian Blockage at mmWave Cellular Networks," IEEE Trans. on Vehicular Technology, vol. 69, no. 12, pp. 15442-15457, Dec. 2020.

173. Y. Cao, T. Ohtsuki and T. Q. S. Quek, "Dual-Ascent Inspired Transmit Precoding for Evolving Multiple-Access Spatial Modulation," in IEEE Transactions on Communications, vol. 68, no. 11, pp. 6945–6961, Nov. 2020.

174. Y. Liu, X. Guan, D. Sun, J. Li, T. Ohtsuki, M. Hassan, and A. Alelaiwi, "Evaluating Smart Grid Renewable Energy Accommodation Capability with Uncertain Generation Using Deep Reinforcement Learning," Future Generation Computer Systems, Vol. 110, pp. 647–657, Sep. 2020.

175. Y. Lu, J. Wang, M. Liu, K. Zhang, T. Ohtsuki, G. Gui, and F. Adachi, "Semi-Supervised Machine Learning Aided Anomaly Detection Method in Cellular Networks," IEEE Transactions on Vehicular Technology, vol. 69, no. 8, pp. 8459–8467, Aug. 2020.

176. L. Lin, X. Guan, Y. Peng, N. Wang, S. Maharjan, and T. Ohtsuki, "Deep Reinforcement Learning for Economic Dispatch of Virtual Power Plant in Internet of Energy," IEEE Internet of Things Journal, vol. 7, no. 7, pp. 6288-6301, July 2020.

177. Y. Wang, G. Gui, H. Gacanin, T. Ohtsuki, H. Sari and F. Adachi, "Transfer Learning for Semi-Supervised Automatic Modulation Classification in ZF-MIMO Systems," in IEEE Journal on Emerging and Selected Topics in Circuits and Systems, vol. 10, no. 2, pp. 231–239, June 2020.

178. C. Ye, K. Toyoda, and T. Ohtsuki, "Blind Source Separation on Non-contact Heartbeat Detection by Non-negative Matrix Factorization Algorithms," IEEE Trans. on Biomedical Engineering (TBME), Online First, pp. 1–13, May 2019, vol. 67, issue 2, pp. 482–494, Feb. 2020.

179. F. H. Panahi and T. Ohtsuki, "Energy Efficiency Analysis in Cache-Enabled D2D-Aided Heterogeneous Cellular Networks," IEEE Access, pp. 19540–19554, Jan. 2020.

180. K. Yamamoto, R. Hiromatsu, and T. Ohtsuki, "ECG Signal Reconstruction via Doppler Sensor by Hybrid Deep Learning Model with CNN and LSTM," IEEE Access, vol. 8, pp. 130551-130560, 2020.

181. Y. Deng and T. Ohtsuki, "Low-Complexity Subspace MMSE Channel Estimation in Massive MU-MIMO System," in IEEE Access, vol. 8, pp. 124371-124381, 2020.

182. K. Yamamoto and T. Ohtsuki, "Non-contact Heartbeat Detection by Heartbeat Signal Reconstruction based on Spectrogram Analysis with Convolutional LSTM," IEEE Access, vol. 8, pp. 123603-123613, 2020.

183. J. Tachibana and T. Ohtsuki, "Learning and Analysis of Damping Factor in Massive MIMO Detection Using BP Algorithm With Node Selection," in IEEE Access, vol. 8, pp. 96859–96866, 2020.

184. Y. Huang, X. Guan, H. Chen, Y. Liang, S. Yuan, and T. Ohtsuki, "Risk Assessment of Private Information Inference for Motion Sensor Embedded A. Devices," IEEE Trans. on Emerging Topics in Computational Intelligence, pp. 1–11, Oct. 2019.

185. Y. Cao and T. Ohtsuki, "Orthogonality Structure Designs for Generalized Precoding Aided Spatial Modulation," IEEE Wireless Communications Letters, Vol. 8, no. 5, pp. 1406–1409, Oct. 2019.

186. M. Bouazizi and T. Ohtsuki, "Multi-Class Sentiment Analysis on Twitter: Classification Performance and Challenges," BIG DATA MINING AND ANALYTICS, Vol. 3, no.4, pp. 181–194, Sep. 2019.

187. A. Li, G. Han, and T. Ohtsuki, "A Fast Blind Scheme with Full Rendezvous Diversity for Heterogeneous Cognitive Radio Networks," IEEE Trans. on Cognitive Communications and Networking, vol. 5, no. 3, pp. 805–818, Sept. 2019.

188. K. Toyoda, P. T. Mathiopoulos, and T. Ohtsuki, "A Novel Methodology for HYIP Operators' Bitcoin Addresses Identification," IEEE Access, Vol. 7, pp. 74835–74848, June 2019.

189. L. Wang and T. Ohtsuki, "Underdetermined Blind Source Separation with Multi-Subspace for Nonlinear Representation," IEEE Access, Vol. 7, pp. 84545–84557, June 2019.

190. C. Ye, K. Toyoda, and T. Ohtsuki, "A Stochastic Gradient Approach for Robust Heartbeat Detection with Doppler Radar Using Time-Window-Variation Technique," IEEE Trans. on Biomedical Engineering (TBME), Vol. 66, Issue 6, pp. 1730–1741, June 2019.

191. Y. Ai, M. Cheffena, T. Ohtsuki, and H. Zhuang, "Secrecy Performance Analysis of Wireless Sensor Networks," IEEE Sensors Letters, Vol. 3, Issue 5, May 2019.

192. K. Yamamoto, K. Toyoda, and T. Ohtsuki, "Doppler Sensor-based Blink Duration Estimation by Analysis of Eyelids Closing and Opening Behavior on Spectrogram," IEEE Access, Vol. 7, No. 1, pp. 2169–3536, Dec. 2018.

193. A. Li, G. Han, and T. Ohtsuki, "Multiple Radios for Fast Rendezvous in Heterogeneous Cognitive Radio Networks," IEEE Access, Vol. 7, No. 1, pp. 37342–37359, Dec. 2018.

194. Y. Cao and T. Ohtsuki, "Precoding Aided Generalized Spatial Modulation with An Iterative Greedy Algorithm," IEEE Access, Vol. 6, No. 1, pp. 72449–72457, Dec. 2018.

195. F. H. Panahi, G. H. Hattab, T. Ohtsuki, and G. Cabric, "Green Heterogeneous Networks via an Intelligent Sleep/Wake-up Mechanism and D2D Communications," IEEE Transactions on Green Communications and Networking, vol. 4, pp. 915–931, Dec. 2018.

196. H. Watanabe, M. Bouazizi, and T. Ohtsuki, "Hate Speech on Twitter: A Pragmatic Approach to Collect Hateful and Offensive Expressions and Perform Hate Speech Detection," IEEE Access, pp. 13825–13835, Vol. 6, Issue 1, Dec. 2018.

197. M. Bouazizi and T. Ohtsuki, "Multi-Class Sentiment Analysis in Twitter: What if Classification is not the Answer," IEEE Access, Vol. 6, no.1, pp. 64486–64502, Oct. 2018.

198. A. Mathur, Y. Ai, M.R. Bhatnagar, M. Cheffena, and T. Ohtsuki, "On Physical Layer Security of α-η-κ-μ Fading Channels," IEEE Communications Letters, Vol. 22, Issue 10, pp. 2168–2171, Oct. 2018.

199. C. Ye, G. Gui, L. Xu, and T. Ohtsuki, "Recovery of Block-Structured Sparse Signal Using Block-Sparse Adaptive Algorithms via Dynamic Grouping," IEEE Access, Vol. 6, pp. 56069–56083, Sep. 2018.

200. L. Wang and T. Ohtsuki, "Nonlinear Blind Source Separation Unifying Vanishing Component Analysis and Temporal Structure," IEEE Access, vol. 6 pp. 42837–42850, July 2018.

201. H.D. Trung, N.T. Hoa, N.H. Trung, and T. Ohtsuki, "A Closed-form Expression for Performance Optimization of Subcarrier Intensity QAM Signals-Based Relay-Added FSO Systems with APD," Physical Communications, https://doi.org/10.1016/j.phycom.2018.04.012, Apr. 2018.

202. K. Yamamoto, K. Toyoda, and T. Ohtsuki, "Spectrogram-based Non-contact RRI Estimation by Accurate Peak Detection Algorithm," IEEE Access, Vol. 6, pp. 60369 - 60379, 2018.

203. T. Ohtsuki, "(Invited Paper) A Smart City Based on Ambient Intelligence," IEICE Transactions on Communications, Vol.E100-B, No.9, pp. 1547–1553, Sep. 2017.

204. M. Bouazizi and T. Ohtsuki, "A Pattern-Based Approach for Multi-Class Sentiment Analysis in Twitter," IEEE Access, vol. 5, pp. 20617–20639, Aug. 2017.

205. T. Song, Q. Wang, M.W. Wu, T. Ohtsuki, M. Gurusamy, and P.Y. Kam, "Impact of Pointing Errors on the Error Performance of Intersatellite Laser Communications," Journal of Lightwave Technology, Vol. 35, no. 14, pp. 3082–3091, July 2017.

206. X. Guan, Y. Huang, M. Chen, H. Wu, T. Ohtsuki, and Y. Zhang, "Exploiting Interference for Capacity Improvement in Software-Defined Vehicular Networks," IEEE Access, pp. 10662–10673, June 2017.

207. K. Toyoda, T.P. Mathiopoulos, I. Sasase, and T. Ohtsuki, "A Novel Blockchain-Based Product Ownership Management System (POMS) for Anti-Counterfeits in The Post Supply Chain," IEEE Access, Vol. 5, pp. 17465–17477, June 2017.

208. F.H. Panahi, T. Ohtsuki, W. Jiang, and Y. Takatori, "Joint Interference Alignment and Power Allocation for Multi-User MIMO Interference Channels under Perfect and Imperfect CSI," IEEE Trans. on Green Communications and Networking, vol. 1, pp. 131–144, Apr. 2017.

209. P. Varela, J. Hong, T. Ohtsuki, and X. Qin, "IGMM-Based Co-localization of Mobile Users With Ambient Radio Signals," IEEE Internet of Things Journal, vol. 4, Issue 2, pp. 308–319, Apr. 2017.

210. S. Iwata, T. Ohtsuki, and P.Y. Kam, "A Lower Bound on Secrecy Capacity for MIMO Wiretap Channel Aided by a Cooperative Jammer with Channel Estimation Error," IEEE Access, vol. 5, pp. 4636-4645, Mar. 2017.

211. M. Ozawa and T. Ohtsuki, "Improvements of FBS Resource Utilization and ABS Assignment Convergence for Dynamic ABS Assignment," IET Communications, Vol. 11, Issue 3, pp. 370–376, Feb. 2017.

212. H. Hayashi and T. Ohtsuki, "Low Computational Complexity Direction-of-Arrival Estimation of Wideband Signal Sources Based on Squared TOPS," IEICE Trans. on Fundamentals of Electronics, Communications and Computer Sciences, Vol.E100-A, No.1, pp. 219–226, Jan. 2017.

213. T. Ohtsuki, "(Invited Paper) Superposed Multicarrier Transmission," ITE Transactions on Media Technology and Applications, Vol. 6, issue, pp. 91–97, 2017.

214. R. Seno, T. Ohtsuki, W. Jiang, and Y. Takatori, "Clustering Small Cells in Heterogeneous Networks with Interference Alignment," IEICE Communications Express, vol. 6, no. 6, pp. 369–374, 2017.

215. K. Toyoda, M. Park, N. Okazaki, and T. Ohtsuki, "Novel Unsupervised SPITters Detection Scheme by Automatically Solving Unbalanced Situation," IEEE Access, vol. 5, pp. 6746–6756, Dec. 2016.

216. R. Seno, T. Ohtsuki, W. Jiang, and Y. Takatori, "A low-complexity cell clustering algorithm in dense small cell networks," EURASIP Journal on Wireless Communications and Networking, Dec. 2016, 2016:262.

217. P. Varela and T. Ohtsuki, "Discovering Co-Located Walking Groups of People Using iBeacon Technology," IEEE Access, vol. 4, pp. 6591–6601, Oct. 2016.

218. H. Hayashi and T. Ohtsuki, "DOA Estimation Using Temporal Spatial Virtual Array Based on Doppler Shift with Adaptive PRI Control," Trans. of IEICE, EB, Vol.E99-B, No.9, pp. 2009–2018, Sep. 2016.

219. M. Bouazizi and T. Ohtsuki, "A Pattern-Based Approach for Sarcasm Detection on Twitter," IEEE Access, vol.4, pp. 5477–5488, Aug. 2016.

220. K. Matsumura and T. Ohtsuki, "Algorithm Design of Relative Magnitude Coefficients Using Brent's Method on the K-User MIMO-IFC," Trans. of IEICE, EB, Vol.E99-B, No.8, pp. 1902–1909, Aug. 2016.

221. Y. Kakizaki, Y. Shibata, T. Ohtsuki, and J. Mashino, "Suppression of multiple wideband interferences based on superposition probability," EURASIP Journal on Wireless Communications and Networking 2016 2016:198.

222. W. Jaafar, T. Ohtsuki, W. Ajib, and D. Haccoun, "Impact of the CSI on the Performance of Cognitive Relay Networks with Partial Relay Selection," IEEE Trans. on Vehicular Technology, vol. 65, Issue 2, pp. 673-684, Feb. 2016.

223. H. Hayashi and T. Ohtsuki, "DOA Estimation for Wideband Signals Based on Weighted Squared TOPS," EURASIP Journal on Wireless Communications and Networking, vol. 2016, article 243, 2016.

224. A. Beylerian and T. Ohtsuki, "Multi-Point Fairness in Resource Allocation for C-RAN Downlink CoMP Transmission," EURASIP Journal on Wireless Communications and Networking, 2016:12.

225. M. Yamamoto and T. Ohtsuki, "Power-absorption-based Model for Power Compensation in WLAN Positioning Using Smartphone," Trans. of IEICE, EB, no. 6, pp. 1125–1132, June 2015.

226. F.H. Panahi and T. Ohtsuki, "Stochastic Geometry Modeling and Analysis of Cognitive Heterogeneous Cellular Networks," EURASIP Journal on Wireless Communications and Networking.

227. J. Hong and T. Ohtsuki, "Signal Eigenvector-based Device-Free Passive Localization using Array Sensor," IEEE Trans. on Vehicular Technology, vol. 64, no. 4, pp. 1354–1363, Apr. 2015.

228. X. Guan, A. Li, Z. Cai, and T. Ohtsuki, "Coalition Graph Game for Robust Routing in Cooperative Cognitive Radio Networks," Mobile Networks and Applications, Springer Netherlands, Vol. 20, Issue 2, pp. 147–156.

229. F.H. Panahi and T. Ohtsuki, "Analytical modeling of cognitive heterogeneous cellular networks over Nakagami-m fading," EURASIP Journal on Wireless Communications and Networking, vol. 2015, 2015:61.

230. X. Guan, Y. Huang, Z. Cai, and T. Ohtsuki, "Intersection-Based Forwarding Protocol for Vehicular Ad Hoc Networks," Telecommunication Systems, Springer Netherlands.

231. Y. Shibata, N. Yoda, T. Ohtsuki, J. Mashino, and T. Sugiyama, "Iterative Estimation of Undesired Signal Power for Superposed Multicarrier Transmission with Channel Estimation Error," EURASIP Journal on Wireless Communications and Networking, vol. 2015, 2015:23.

232. A.S. Arifin and T. Ohtsuki, "Ergodic Capacity Analysis of Full-duplex MIMO Relay Channel using Tracy-Widom Distribution with Processing Delay," International Journal of Technology, Vol. 6, No. 2, 2015. http://dx.doi.org/10.14716/ijtech.v6i2.1003.

233. H. Zhuang and T. Ohtsuki, "A Model Based on Poisson Point Process for Analyzing MIMO Heterogeneous Networks Utilizing Fractional Frequency Reuse," IEEE Trans. on Wireless Communications, Vol. 13, Issue 12, pp. 6839–6850, Dec. 2014.

234. J.C. Corena and T. Ohtsuki, "Pollution-Free Regenerating Codes With Fast Reconstruction Verification for Verifiable Cloud Storage," Journal of Networks, Vol. 9, No. 11, pp. 2892–2904, Nov. 2014.

235. D. Chaima and T. Ohtsuki, "Adaptive Q-Learning Cell Selection Method for Open-access Femtocell Networks: Multi- User Case," Trans. of IEICE, EB, no. 8, pp. 1679–1688, Aug. 2014.

236. D. Chaima and T. Ohtsuki, "Cell Selection for Open-Access Femtocell Networks: Learning in Changing Environment," Physical Communications.

237. H. Zhuang and T. Ohtsuki, "A Model Based on Poisson Point Process for Downlink K Tiers Fractional Frequency Reuse Heterogeneous Networks," Physical Communications.

238. F.H. Panahi and T. Ohtsuki, "Optimal Channel-Sensing Scheme for Cognitive Radio Systems Based on Fuzzy Q-Learning," Trans. on IEICE, EB, no. 2, pp. 283–294, Feb. 2014.

239. A.S. Arifin and T. Ohtsuki, "Capacity of Data Collection in Wireless Sensor Networks based on Mutual Information and MMSE Estimation," International Scholarly Research Network (ISRN) Communications and Networking, Vol. 2014.

240. K. Mitsuyama, T. Ikeda, and T. Ohtsuki, "Development and Performance Evaluation of MMSE Macro-Diversity Reception System with Delay Difference Correction," IEEE Trans. on Vehicular Technology, Vol.62, No. 9, pp. 4288–4298, Nov. 2013.

241. X. Guan, M. Chen, and T. Ohtsuki, "Non-Cooperative Game based Packet Ferry Forwarding for Sparse Mobile Wireless Networks," Wireless Communications and Mobile Computing.

242. A.S. Arifin and T. Ohtsuki, "Water-Filling Solution for Distributed Estimation of Correlated Data in WSN MIMO System," International Scholarly Research Network (ISRN) Communications and Networking, Vol. 2013.

243. S. Tomii and T. Ohtsuki, "Learning Based Falling Detection Using Multiple Doppler Sensors," Advances in Internet of Things, vol. 3, no. 2A, pp. 33–34, June 2013.

244. Y. Inatomi, J. Hong, and T. Ohtsuki, "Hidden Markov Model Based Localization Using Array Antenna," International Journal of Wireless Information Networks, Vol. 20, Issue 4, pp 246-255.

245. K. Mitsuyama, T. Ikeda, and T. Ohtsuki, "MIMO Receiver with Antenna Subset Selection: Algorithm and Hardware Implementation," Trans. of IEICE, E96-B, no. 4, pp. 1039–1050, Apr. 2013.

246. T. Kudo and T. Ohtsuki, "Cell Range Expansion Using Distributed Q-Learning in Heterogeneous Networks," EURASIP Journal on Wireless Communications and Networking, vol. 2013, 2013:61.

247. O. Souihli and T. Ohtsuki, "Benefits of Rich Scattering in MIMO Channels: A Graph-Theoretical Perspective," IEEE Communications Letters, Vol. 17, No. 1, pp. 23–26, Jan. 2013.

248. J.C. Corena and T. Ohtsuki, "Secure and Fast Aggregation of Financial Data in Cloud-Based Expense Tracking Applications," Journal of Networks and Systems Management, Vol. 20, No. 4, pp. 534–560, Dec. 2012.

249. J. Hong and T. Ohtsuki, "State Classification with Array Sensor using Support Vector Machine for Wireless Monitoring Systems, Trans. of IEICE, Vol. E95-B, No.10, pp. 3088–3095, Oct. 2012.

250. J. Hong, S. Kawakami, C.N. Nyirenda, and T. Ohtsuki, "Array Antenna based Localization Using Spatial Smoothing Processing," Journal of Communications, Vol. 7, No. 6, 427–435, June 2012.

251. N.B. Harum, T. Ohtsuki, and M. Nakagawa, "PAPR Reduction of TDD-CDMA Using Joint Transmission Technique," Trans. of IEICE, Vol.E95-B, No.3, pp. 933–942, Mar. 2012.

252. X. Guan, M. Chen, and T. Ohtsuki, "Epidemic Theory Based H + 1 Hop Forwarding for Intermittently Connected Mobile Ad Hoc Networks," EURASIP Journal on Wireless Communications and Networking, 2012:76, 10 pages.

253. M. Jilani and T. Ohtsuki, "Joint SVD-GSVD precoding technique and secrecy capacity lower bound for the MIMO relay wire-tap channel," EURASIP Journal on Wireless Communications and Networking, vol. 2012, 2012:361.

254. O. Souihli and T. Ohtsuki, "Transparent Inband Feedback for Training-Based MIMO Systems," Wireless Personal Communications, Vol. 63, Issue 3 (2012), pp. 587–599, 2012.

255. Y. Hemmi, K. Adachi, and T. Ohtsuki, "Subcarrier Mapping for Single-User SC-FDMA Relay Communications," Trans. of IEICE, Vol. E94-A, No.12, pp. 2776–2779, Dec. 2011.

256. H. Chen, Q. Wan, H. Chen, and T. Ohtsuki, "Robust DOA Estimation for Uncorrelated and Coherent Signals," Trans. of IEICE, Vol. EB94-A, No.10, pp. 2035–2038, Oct. 2011.

257. S. Kawakami and T. Ohtsuki, "Localization Using Iterative Angle of Arrival Method Sharing Snapshots of Coherent Subarrays," EURASIP Journal on Advances in Signal Processing, Volume 2011 (2011), Aug. 2011.

258. K. Matsumura and T. Ohtsuki, "Orthogonal Beamforming Using Gram-Schmidt Orthogonalization for Multi-User MIMO Downlink System," EURASIP Journal on Wireless Communications and Networking, 2011:41.

259. N. Lynn, O. Takyu, K. Adachi, M. Nakagawa, and T. Ohtsuki, "An autonomous cooperative ARQ Protocol for Hybrid Mobile Wireless Sensor Networks," Journal of Communications, Vol. 6, no. 2, pp. 157–167, Apr. 2011.

260. O. Souihli and T. Ohtsuki, "Typical Set Cognitive Sensing," International Scholarly Research Network (ISRN) Communications and Networking, Volume 2011 (2011), Article ID 709091, 10 pages.

261. O. Rodriguez and T. Ohtsuki, "Improving Accuracy for Range-Based Localization in Multiple Target Wireless Sensor Networks," International Scholarly Research Network (ISRN) Communications and Networking, vol. 2011, Article ID 898123, 7 pages, 2011.

262. Y. Wang, T. Ohtsuki, A. Vasilakos, A. Sabharwal, Y. Chen and Y. Tseng, "Algorithms, Protocols and Future Applications of Wireless Sensor Networks," in The Computer Journal, vol. 53, no. 10, pp. 1551-1552, Dec. 2010.

263. C. Sertthin, T. Ohtsuki, and M. Nakagawa, "6Axes Sensor Assisted Low Complexity High Accuracy Visible Light Communication Based Indoor Positioning System," Trans. of IEICE, E93-B, no. 11, pp. 2879–2891, Dec. 2010.

264. K. Mitsuyama, T. Ikeda, and T. Ohtsuki, "Performance Evaluation of Iterative LDPC-Coded MIMO OFDM System with Time Interleaving," Trans. of IEICE, E93-A, no. 12, pp. 2654–2662, Dec. 2010.

265. C. Sertthin, T. Fujii, T. Ohtsuki, and M. Nakagawa, "Multi-band Received Signal Strength Fingerprinting Based Indoor Location System," Trans. of IEICE, E93-B, no.8, pp. 1993–2003, Aug. 2010.

266. Y. Kumano and T. Ohtsuki, "Half-Duplex Relaying with Serially-Concatenated Low-Density Generator Matrix (SCLDGM) Codes," Elsevier Physical Communications, vol. 3, issue 2, pp. 129–135, June 2010.

267. O. Souihli and T. Ohtsuki, "Joint Feedback and Scheduling Scheme For Training-Based Multiuser MIMO Systems With Service Differentiation," IEEE Trans. on Wireless Communications, vol. 9, no. 2, pp. 528–533, Feb. 2010.

268. X. Guan, L. Guan, X.G. Wang, and T. Ohtsuki, "A New Load Balancing And Data Collection Algorithm For Energy Saving In Wireless Sensor Networks," Telecommunication Systems, Springer Netherlands, Volume 45, Number 4 (2010), 313-322.

269. S. Kawakami, K. Okane, and T. Ohtsuki, "Detection Performance of Security System Using Radio Waves Based on Space-Time Signal Processing," Procedia–Social and Behavioral Sciences, vol. 2, no. 1, pp. 171–178, 2010.

270. M. Yanase and T. Ohtsuki, "User Selection Scheme with Secrecy Capacity in MIMO Downlink Systems," Procedia–Social and Behavioral Sciences, vol. 2, no. 1, pp. 161–170, 2010.

271. Z. Min and T. Ohtsuki, "An Improved User Selection Algorithm in Multiuser MIMO Broadcast with Channel Prediction," Trans. of IEICE, E92-B, no.8, pp. 2667–2674, Aug. 2009.

272. S. Ikeda, H. Tsuji, and T. Ohtsuki, "Indoor Event Detection with Signal Subspace Spanned by Eigenvector for Home or Office Security," Trans. of IEICE, E92-B, no.7, pp. 2406–2412, July 2009.

273. Y. Tsuchiya and T. Ohtsuki, "Random Beamforming Using Iterative Power Allocation with Small Feedback Information and Low Latency," Trans. of IEICE, E92-B, no.5, pp.1908–1911, May 2009.

274. J.H. Lee, T. Ohtsuki, and M. Nakagawa, "Turbo Equalized Double Window Cancellation and Combining Robust to Large Delay Spread Channel," Trans. of IEICE, E92-B, no. 2, pp. 517–526, Feb. 2009.

275. S. Gounai and T. Ohtsuki, "Convergence Acceleration of Iterative Signal Detection for MIMO System with Belief Propagation," Trans. of IEICE, E91-B, no. 8, pp. 2640–2648, Aug. 2008.

276. S. Gounai, T. Ohtsuki, and T. Kaneko, "Mapping for Iterative MMSE-SIC with Belief Propagation," Trans. of IEICE, E91-B, no. 7, pp. 2187–2197, July 2008.

277. I. Yamada, T. Ohtsuki, T. Hisanaga, and Li Zheng "An indoor position estimation method by maximum likelihood algorithm using received signal strength," SICE Journal of Control, Measurement, and System Integration, vol. 1, no. 3, pp. 251–256, Mar. 2008.

278. K. Kobayashi, T. Ohtsuki, and T. Kaneko, "MIMO Systems in the Presence of Feedback Delay," Trans. of IEICE, E91-B, no. 3, pp. 829–836, Mar. 2008.

279. K. Kobayashi, T. Someya, T. Ohtsuki, S. PW. Sigit, and T. Kashima, "MIMO System with Relative Phase Difference Time-Shift Modulation for Rician Fading Environment," Trans. of IEICE, E91-B, no. 2, pp. 459–465, Feb. 2008.

280. Y. Tsuchiya, T. Ohtsuki, and T. Kaneko, "Scheduling Algorithm with Power Allocation for Random Unitary Beamforming," Trans. of IEICE, E91-B, no. 1, pp. 232–238, Jan. 2008.

281. J.H. Lee, Y. Kishiyama, T. Ohtsuki, and M. Nakagawa, "Double window cancellation and combining for OFDM in time-invariant large delay spread channel," Trans. of IEICE, E90-A, no. 10, pp. 2066–2078, Oct. 2007.

282. F. Tsuzuki and T. Ohtsuki, "Performance Evaluation of SAGE Algorithm for Channel Estimation and Data Detection Using Superimposed Training in MIMO System," Trans. of IEICE, E90-B, no. 6, pp. 1460–1466, June 2007.

283. (Invited Survey Paper) T. Ohtsuki, "LDPC codes in communications and broadcasting," Trans. of IEICE, E90-B, no. 3, pp. 440–453, Mar. 2007.

284. S. Gounai, T. Ohtsuki, and T. Kaneko, "Lowering Error Floors of Irregular LDPC Code on Fast Fading Environment with Perfect and Imperfect CSIs," Trans. of IEICE, E90-B, no. 3, pp. 569–577, Mar. 2007.

285. S. Ichiki and T. Ohtsuki, "Chip-level Detection in Optical Frequency Hopping Code Division Multiple Access," Trans. of IEICE, E89-A, no. 7, pp. 2056–2062, July 2006.

286. O. Takyu, T. Ohtsuki, and M. Nakagawa, "Companding System Based on Time Clustering for Reducing Peak Power of OFDM Symbol in Wireless Communications,'' IEICE Trans. of IEICE, E89-A, no. 7, pp. 1884–1891, July 2006.

287. D. Takase and T. Ohtsuki, "Spatial Multiplexing in Optical Wireless MIMO Communications Over Indoor Environment," Trans. of IEICE, E89-B, no. 4, pp. 1364–1371, Apr. 2006.

288. O. Takyu, T. Ohtsuki, and M. Nakagawa, "A Sign Selection Method of Orthogonal Variable Spreading Factor Code for Peak Power Reduction in Multi-Rate OFCDM Systems," Trans. of IEICE, E89-B, no. 4, pp. 1333–1345, Apr. 2006.

289. Y. Inaba and T. Ohtsuki, "Bootstrapped Modified Weighted Bit Flipping Decoding of Low Density Parity Check Codes," Trans. of IEICE, E89-A, no. 4, pp. 1145–1149, Apr. 2006.

290. Y. Inaba, T. Saito, and T. Ohtsuki, "Reliability-Based Hybrid ARQ (RB-HARQ) Schemes using Low-Density Parity-Check (LDPC) Codes," Trans. of IEICE, E89-B, no. 4, pp. 1170–1177, Apr. 2006.

291. T. Ohtsuki, "Performance Analysis of Statistical STBC Cooperative Diversity Using Binary Sensors with Observation Noise," Trans. of IEICE, E89-B, no. 3, pp. 970–973, Mar. 2006.

292. K. Honjo and T. Ohtsuki, "Computational Complexity Reduction of MLD Based on SINR in MIMO Spatial Multiplexing Systems," Trans. of IEICE, E89-B, no. 3, pp. 914–921, Mar. 2006.

293. H. Sato and T. Ohtsuki, "Frequency Domain Channel Estimation and Equalization for Direct Sequence-Ultra Wideband (DS-UWB) System," IEE Proc. Commun., vol. 153, No. 1, pp. 93–98, Feb. 2006.

294. F. Tsuzuki and T. Ohtsuki, "Channel Estimation with Selective Superimposed Pilot Sequences under Fast Fading Environments," Trans. of IEICE, E89-B, no. 2, pp. 556–563, Feb. 2006.

295. S. Gounai and T. Ohtsuki, "Lowering Error Floor of Irregular LDPC Codes by CRC and OSD Algorithm," Trans. of IEICE, E89-B, no. 1, pp. 1–10, Jan. 2006.

296. S. Teramoto and T. Ohtsuki, "Multiple-subcarrier optical communication systems with subcarrier signal point sequence," IEEE Trans. on Communications, no.10, pp. 1738–1743, Oct. 2005.

297. K. Suto, Y. Hara, T. Ohtsuki, and Y. Takei, "Throughput Maximization Transmission Control Scheme for MIMO Systems," Trans. of IEICE, E88-B, no. 10, pp. 4040–4046, Oct. 2005.

298. T. Ezaki and T. Ohtsuki, "Rake Performance for UWB-IR system with SISO and MISO," Trans. of IEICE, E88-B, no. 10, pp. 4112–4116, Oct. 2005.

299. H. Sato and T. Ohtsuki, "Computational Complexity and Performance of RAKE Receivers with Channel Estimation for DS-UWB," Trans. of IEICE, E88-A, no. 9, pp. 2318–2326, Sep. 2005.

300. S. Gounai and T. Ohtsuki, "Decoding Algorithms Based on Oscillation for Low-Density Parity Check Codes," Trans. of IEICE, E88-A, no. 8, pp. 2216–2226, Aug. 2005.

301. O. Takyu, T. Ohtsuki, and M. Nakagawa, "Criterion for Improving Error Rate Degradation by Nonlinear Amplifier for Multicarrier Transmission," Trans. of IEICE, E88-B, no. 7, pp. 3057–3069, July 2005.

302. S. Imada and T. Ohtsuki, "Pre-Rake Diversity Combining for UWB Systems in IEEE 802.15 UWB Multipath Channel," Trans. of IEICE, E88-B, no. 5, pp. 2193–2199, May 2005.

303. K. Wakafuji and T. Ohtsuki, "Performance Analysis of Atmospheric Optical Subcarrier Multiplexing Systems and Atmospheric Optical Subcarrier Modulated Code Division Multiplexing Systems," Journal of Lightwave Technology, Vol. 23, no. 10, pp. 1676–1682, Apr. 2005.

304. N. Kitamoto and T. Ohtsuki, "Parallel Combinatory Multiple-Subcarrier Optical Wireless Communication Systems," Wiley International Journal of Communication Systems, Vol. 18, Issue 3, pp. 195–203, Mar. 2005.

305. S. Teramoto and T. Ohtsuki, "Optical Wireless Sensor Network System Using Corner Cube Retroreflectors," EURASIP Journal on Wireless Communications and Networking, vol. 2005, no. 1, pp. 39–44, Mar. 2005.

306. Y. Sasazaki and T. Ohtsuki, "Design Criteria for Space-Time Trellis Codes Based on Product Distance Distribution and Trace Distribution in Fast Fading Channels," Electronics and Communications in Japan (Part I: Communications), vol. 88, no. 11, pp. 54–64, 2005.

307. S. Teramoto and T. Ohtsuki, "Multiple-Subcarrier Optical Communication System with Peak Reduction Carriers," Trans. of IEICE, E87-B, no. 11, pp. 3385–3388, Nov. 2004.

308. A. Ogawa, T. Yamazato, and T. Ohtsuki, "Information and Signal Processing for Sensor Networks," Trans. of IEICE, E87-A, no. 10, pp. 2599–2606, Oct. 2004. [Invited Paper].

309. N. Ohkubo and T. Ohtsuki, "OFDM Packet Transmission System with Added Pilot Semi-Blind Iterative Channel Estimation for Tracking Fast Time-Varying Channel," Trans. of IEICE, E87-B, no. 9, pp. 2729–2737, Sep. 2004.

310. T. Ezaki and T. Ohtsuki, "Diversity Gain in Ultra Wideband Impulse Radio (UWB-IR)," Trans. of IEICE, E87-B, no. 8, pp. 2385–2390, Aug. 2004.

311. K. Suto and T. Ohtsuki, "Space-Time-Frequency Block Codes over Frequency Selective Fading Channels," Trans. of IEICE, E87-B, no. 7, pp. 1939–1945, July 2004.

312. H. Kanemaru and T. Ohtsuki, "Space-Time/Space-Frequency Block Coded OFDM with Diagonalized Maximum Likelihood Decoder (ST/SF-OFDM with DMLD)," Trans. of IEICE, E87-B, no. 7, pp. 2034–2039, July 2004.

313. T. Horiuchi, W. Yang, T. Ohtsuki, and I. Sasase, "Performance Evaluation of OFDM With a Nonlinear Distortion Compensation Technique Using Partial Transmit Sequence and Predistortion," Electronics and Communications in Japan (Part I: Communications), vol. 87, no. 6, pp. 34–42, June 2004.

314. 笹崎幸弘, 大槻知明, "高速フェージング環境における積距離分布及びトレース分布に基づく空間時間トレリス符号の設計基準," 電子情報通信学会論文誌 B, Vol. J87-B, no. 6, pp. 773–783, June 2004.

315. O. Takyu, T. Ohtsuki, and M. Nakagawa, "Frequency Offset Compensation with MMSE-MUD for Multi-Carrier CDMA in Quasi-Synchronous Uplink," Trans. of IEICE, E87-B, no. 6, pp. 1495–1504, June 2004.

316. H. Futaki and T. Ohtsuki, "Decoding Algorithms for Low-Density Parity-Check Codes with Multilevel Modulations," Trans. of IEICE, E87-B, no. 5, pp. 1282–1289, May 2004.

317. H. Futaki and T. Ohtsuki, "Low-Density Parity-Check (LDPC) Coded OFDM Systems: Bit Error Rate and The Number of Decoding Iterations," Trans. of IEICE, E86-B, no. 11, pp. 3310–3336, Nov. 2003.

318. K. Wakafuji and T. Ohtsuki, "Direct-Detection Optical CDMA Receiver With Interference Estimation and Double Optical Hardlimiters," Journal of Lightwave Technology, Vol. 21, No. 10, pp. 2182–2188, Oct. 2003.

319. H. Futaki and T. Ohtsuki, "Space-Time Transmit Diversity Schemes with Low-Density Parity-Check (LDPC) Codes," Trans. of IEICE, E86-B, no. 10, pp. 3131–3136, Oct. 2003.

320. K. Wakafuji and T. Ohtsuki, "Multibits/Sequence-Period Optical CDMA Receiver with Double Optical Hardlimiters," Trans. of IEICE, E86-A, no. 10, pp. 2670–2677, Oct. 2003.

321. N. Ohkubo and T. Ohtsuki, "Design Criteria for Phase Sequences in Selected Mapping," Trans. of IEICE, E86-B, no. 9, pp. 2628–2636, Sep. 2003.

322. H. Yamaguchi, T. Ohtsuki, and I. Sasase, "Multiple Subcarrier Modulation for Infrared Wireless Systems Using Punctured Convolutional Codes and Variable Amplitude Block Codes," Trans. of IEICE, E86-B, no. 8, pp. 2433–2439, Aug. 2003.

323. T. Ohtsuki, "Multiple-Subcarrier Modulation in Optical Wireless Communications," IEEE Communications Magazine, vol. 41, no. 3, pp. 74–79, Mar. 2003.

324. Y. Sasazaki and T. Ohtsuki, "Improved Design Criteria and New Trellis Codes for Space-Time Trellis Coded Modulation in Fast Fading Channels," Trans. of IEICE, E86-B, no. 3, pp. 1057–1062, Mar. 2003.

325. T. Ohtsuki, "Performance Analysis of Atmospheric Optical PPM CDMA Systems," Journal of Lightwave Technology, Vol. 21, No. 2, pp. 406–411, Feb. 2003.

326. 堀内隆明, 楊偉祖, 大槻知明, 笹瀬 巌, "プレディストーション及び部分系列伝送を用いたOFDM非線形ひずみ補償法の特性評価," 電子情報通信学会論文誌 B, Vol.J85-B, No.11, pp. 1865–1873, Nov. 2002.

327. H. Yamaguchi, R. Matsuo, T. Ohtsuki, and I. Sasase, "Equalization for Infrared Wireless Systems Using OOK-CDMA," Trans. of IEICE, E85-B, no. 10, pp. 2292–2299, Oct. 2002.

328. 松尾綾子, 大槻知明, 笹瀬巌, "EMアルゴリズムを用いた空間時間符号化でのチャネル推定及び送信信号検出の簡略化," 電子情報通信学会論文誌 B, Vol.J85-B, No.1, pp. 20–30, Jan. 2002.

329. H. Yamaguchi, R. Matsuo, M. Matsuo, T. Ohtsuki, and I. Sasase, "Indoor Infrared Wireless Systems using OOK-CDMA with Decision-Feedback Equalizer on Diffuse Channels," Trans. of IEICE, E84-B, no. 4, pp. 960–966, Apr. 2001.

330. 新宮秀樹, 鎌倉功弘, 大槻知明, 笹瀬巌, "光クリッパを設けた干渉除去器を適用した光符号分割多元接続方式," 電子情報通信学会論文誌 B, Vol.J84-B, No.1, pp. 50–60, Jan. 2001.

331. R. Matsuo, M. Matsuo, T. Ohtsuki, I. Sasase, and T. Udagawa, "Performance Analysis of Indoor Infrared Wireless Systems Using OOK CDMA on a Diffuse Channel," Electronics and Communications in Japan (Part I: Communications), vol. 84, no. 10, pp. 1–9, 2001.

332. T. Ohtsuki and J. M. Kahn, "BER Performance of Turbo-Coded PPM CDMA Systems on Optical Fiber," Journal of Lightwave Technology, Vol. 18, No. 12, pp. 1776–1784, Dec. 2000.

333. 佐藤章博, 大槻知明, 笹瀬巌,"サイトダイバーシチを用いた無指向性直射室内赤外線無線通信システムの光路しゃへいに関する一検討," 電子情報通信学会論文誌 B, Vol.J83-B, No.12, pp. 1692–1702, Dec. 2000.

334. H. Sawagashira, K. Kamakura, T. Ohtsuki, and I. Sasase, "Direct-Detection Optical Synchronous CDMA Systems with Interference Canceller Using Group Information Codes," Trans. of IEICE, E83-A, no. 11, pp. 2138–2142, Nov. 2000.

335. Y. Gamachi, T. Ohtsuki, H. Uehara, and I. Sasase, "An Optical Synchronous M-Ary FSK/CDMA System Using an Interference Canceler," Electronics and Communications in Japan (Part I: Communications), vol. 83, no. 9, pp. 20–32, Sept. 2000.

336. A. Sato, T. Ohtsuki, H. Uehara, and I. Sasase, "A Study of Transmitted Pulse Waveforms on Indoor Infrared Wireless Communications via Diffuse Links," Electronics and Communications in Japan (Part I: Communications), vol. 83, no. 9, pp. 33–43, Sept. 2000.

337. 園田敏雄, 新宮秀樹, 鎌倉功弘, 大槻知明, 笹瀬巌, "時間領域符号化を適用した光周波数領域符号化符号分割多元接続方式の特性解析," 電子情報通信学会論文誌 B, Vol.J83-B, No.8, pp. 1114–1124, Aug. 2000.

338. 大槻知明, "PPM CDMAを用いた室内赤外線無線通信方式の特性解析," 電子情報通信学会論文誌 B,Vol.J83-B, No.7, pp. 937–947, July 2000.

339. 松尾綾子, 松尾道人, 大槻知明, 笹瀬巌, 宇田川智之, "拡散反射通信路におけるOOK CDMA室内赤外線無線通信方式の特性解析," 電子情報通信学会論文誌 B, Vol.J83-B, No.7, pp. 970–979, July 2000.

340. T. Ohtsuki, "Rate-Adaptive Indoor Infrared Wireless Communication Systems Using Repeated and Punctured Convolutional Codes," IEEE Communications Letters, Vol. 4, No. 2, pp. 56–58, Feb. 2000.

341. 松尾道人, 大槻知明, 笹瀬巌, 宇田川智之, "パンクチャド畳込み符号と適応PPM変調を用いた適応ビットレート室内赤外線無線通信方式," 電子情報通信学会論文誌 B, Vol.J83-B, No.1, pp. 14–21, Jan. 2000.

342. 新宮秀樹, 蒲池嘉展, 大槻知明, 笹瀬巌, "マルチパルス位置変調を用いた光符号分割多重方式," 電子情報通信学会論文誌 B, Vol.J82-B, No.9, pp. 1689–1701, Sep. 1999.

343. K. Kamakura, T. Ohtsuki, and I. Sasase, "Optical Spread Time CDMA Communication Systems with PPM Signaling," Trans. of IEICE, E82-B, No. 7, pp. 1038–1047, July 1999.

344. W. Yang, T. Ohtsuki, M. Ueda, K. Matsumoto, and I. Sasase, "Performance Analysis of ADSL with Punctured Convolutional Code," Trans. of IEICE, E82-B, No. 7, pp. 1030–1037, July 1999.

345. T. Ohtsuki, "Performance Analysis of Direct-Detection Optical CDMA Systems with Optical Hard-Limiter using Equal-Weight Orthogonal Signaling," Trans. of IEICE, E82-B, No. 3, pp. 512–520, March 1999.

346. 蒲池嘉展, 大槻知明, 上原秀幸, 笹瀬巌, "干渉キャンセラを適用した光同期 M-ary FSK/CDMA方式," 電子情報通信学会論文誌 B, Vol.J82-B, No.1, pp. 43–55, Jan. 1999.

347. 佐藤章博, 大槻知明, 上原秀幸, 笹瀬巌, "拡散反射通信路を利用した室内赤外線無線通信における送信パルス波形の検討," 電子情報通信学会論文誌 B, Vol.J81-B1, No.12, pp. 861–871, Dec. 1998.

348. K. Kamakura, Y. Gamachi, H. Uehara, T. Ohtsuki, and I. Sasase, "Performance Analysis of Optical Frequency Domain Encoding CDMA Enhancement of Frequency Division Multiplexing," Trans. of IEICE, E81-B, No.9, pp. 1749–1757, Sep. 1998.

349. T. Ohtsuki, "Direct-Detection Optical Asynchronous CDMA Systems with Double Optical Hard-Limiters: APD Noise and Thermal Noise," Trans. of IEICE, E81-B, No. 7, pp. 1491–1499, July 1998.

350. T. Ohtsuki, "Channel Interference Cancellation Using Electrooptic Switch and Optical Hard-Limiters for Direct-Detection Optical CDMA Systems," Journal of Lightwave Technology, vol. 16, no. 4, pp. 520–526, April 1998.

351. T. Ohtsuki, M. Takeoka, and E. Iwahashi, "Performance Analysis of Direct-Detection Optical Synchronous CDMA Systems with Co-Channel Interference Canceller," Trans. of IEICE, E80-A, No. 11, pp. 2260–2263, Nov. 1997.

352. T. Ohtsuki, "Performance Analysis of Direct-Detection Optical Asynchronous CDMA Systems with Double Optical Hard-Limiters," Journal of Lightwave Technology, vol. 15, no. 3, pp. 452–457, March 1997.

353. T. Ohtsuki, K. Sato, I. Sasase, and S. Mori, "Direct-Detection Optical Synchronous CDMA Systems with Double Optical Hard-Limiters Using Modified Prime Sequence Codes," IEEE Journal on Selected Areas on Communications, vol. 14, no. 9, pp. 1879–1887, Dec. 1996.

354. T. Ohtsuki, "Direct-Detection Optical Synchronous CDMA Systems with Channel Interference Canceller using Time Division Reference Signal," Trans. of IEICE, E79-A, No. 12, pp. 1948–1956, Dec. 1996.

355. T. Ohtsuki, I. Sasase, and S. Mori, "Access Timing Controlled Direct-Detection Optical CDMA Systems with PPM Signaling," Trans. of IEICE, E79-A, No. 9, pp. 1392–1400, Sep. 1996.

356. T. Ohtsuki, I. Sasase, and S. Mori, "Cutoff Rate Analysis of Overlapping Multi-pulse Pulse Position Modulation (OMPPM) in Optical Direct-Detection Channel," Trans. of IEICE, E79-A, No. 9, pp. 1471–1474, Sep. 1996.

357. K. Sato, T. Ohtsuki, H. Uehara, and I. Sasase, "Effect of Imperfect Slot Synchronization on Direct-Detection Optical Synchronous CDMA Communication Systems with PPM Signaling," Journal of Lightwave Technology, vol. 14, no. 9, pp. 1963–1969, Sep. 1996.

358. Y. Gamachi, T. Ohtsuki, H. Uehara, and I. Sasase, "Performance Analysis of Optical Synchronous PPM/CDMA Systems with Interference Canceller Under Number-State Light Field," Trans. of IEICE, E79-B, No.7, pp. 915–922, July 1996.

359. N. Aoki, T. Ohtsuki, and I. Sasase, "Performance Analysis of Multi-Pulse Pulse Position Modulation Using Avalanche Photodiode in Optical Intersatellite Links," Trans. of IEICE, E79-B, No. 11, pp. 52–56, Jan. 1996.

360. T. Ohtsuki, I. Sasase, and S. Mori, "Effects of Hard-Limiter and Error Correction Coding on Performance of Direct-Detection Optical CDMA Systems with PPM Signaling," Trans. of IEICE, Vol. E78-A, No. 9, pp. 1092–1101, Sep. 1995.

361. K. Sato, T. Ohtsuki and I. Sasase, "Coding for Multi-pulse PPM with Imperfect Slot Synchronization in Optical Direct-Detection Channels," Trans. of IEICE, Vol. E78-B, No. 6, pp. 916–922, June 1995.

362. H. Uehara, T. Ohtsuki, and I. Sasase, "Performance Analysis of Coherent Optical POLSK Receivers with Local Oscillator Intensity Noise and Unmatched Quantum Efficiencies," Trans. of IEICE, Vol. E77-B, No. 12, pp. 1590–1599, Dec. 1994.

363. T. Ohtsuki, I. Sasase, and S. Mori, "Lower Bounds on Capacity and Cutoff Rate of Differential Overlapping Pulse Position Modulation in Optical Direct-Detection Channel," Trans. of IEICE, E77-B, No. 10, pp. 1230–1237, Oct. 1994.

364. T. Ohtsuki, I. Sasase, and S. Mori, "Error Performance of Overlapping Multi-Pulse Pulse Position Modulation (OMPPM) and Trellis Coded OMPPM in Optical Direct-Detection Channel," Trans. of IEICE, Vol. E77-B, No. 9, pp. 1133–1143, Sep. 1994.

365. T. Ohtsuki, I. Sasase, and S. Mori, "Capacity and Cutoff Rate of Overlapping Multi-pulse Pulse Position Modulation (OMPPM) in Optical Direct-Detection Channel: Quantum Limited Case," Trans. of IEICE, Vol. E77-A, No. 8, pp. 1298–1308, Aug. 1994.

366. T. Ohtsuki, I. Sasase, and S. Mori, "Performance Analysis of Multi-pulse Pulse Position Modulation (MPPM) in Noisy Photon Counting Channel," Trans. of IEICE, Vol. E77-A, No. 8, pp. 1381–1386, Aug. 1994.

367. K. Sato, T. Ohtsuki, and I. Sasase, "Performance Analysis of Multi-Pulse PPM With Imperfect Slot Synchronization in Optical Direct-Detection Channel," Trans. of IEICE, Vol. E77-B, No. 8, pp. 1032–1039, Aug. 1994.

368. I. Seto, T. Ohtsuki, I. Sasase, and S. Mori, "Polarization Shift Keying (POLSK) Phase Diversity Homodyne System with Multiplying Detection in Coherent Optical Communications," Journal of Fibre and Integrated Optics, Vol. 12, No. 4, pp. 381–395, Sep. 1993.

369. T. Ohtsuki, I. Sasase, and S. Mori, "The Effects of Laser Phase Noise on Optical Coherent Coded Subcarrier Multiplexing System with Distributing Local Oscillator in Local Loop," Trans. of IEICE, Vol. E76-C, No. 2, pp. 293–300, June 1993.

370. T. Ohtsuki, H. Yashima, I. Sasase, and S. Mori, "Coherent Subcarrier Multiplexed System with Distributing Local Oscillator in Local Loop," Trans. of IEICE, Vol. E75-B, No. 6, pp. 499–505, June 1992.

371. I. Seto, T. Ohtsuki, H. Yashima, I. Sasase, and S. Mori, "Coherent Optical Polarization-Shift-Keying (POLSK) Homodyne System Using Phase-Diversity Receivers," Trans. of IEICE, Vol. E75-A,C, No. 1, pp. 52–59, pp. 50– 57, Jan. 1992.

372. T. Ohtsuki, H. Yashima, I. Sasase, and S. Mori, "Parallel Rate-Variable Punctured Convolutional Coded PPM in Photon Communication," Trans. of IEICE, Vol. E75-A,C, No. 1, pp. 46–51, pp. 44–49, Jan. 1992.

373. T. Ohtsuki, H. Yashima, I. Sasase, and S. Mori, "Cutoff Rate and Capacity of MPPM in Noiseless Photon Counting Channel," Trans. of IEICE, Vol. E74, No. 12, pp. 4080–4084, Dec. 1991.