学術論文誌 / Journals

1. Y. Shibata, W. Takabatake, K. Hoshino, A. Nagate and T. Ohtsuki, "HAPS Cell Design Method for Coverage Extension Considering Coexistence on Terrestrial Mobile Networks," IEEE Access, Accepted.

2. S. Xu, X. Guan, Y. Peng, C. Cui, H. Chen, T. Ohtsuki, and Z. Han, "Deep Reinforcement Learning based Data-driven Mapping Mechanism of Digital Twin for Internet of Energy," IEEE Transactions on Network Science and Engineering Information for Authors, Accepted.

3. V. Ganapathy, R. Ramachandran, and T. Ohtsuki, "Deep Learning Methods for Secure IoT SWIPT Networks," IEEE Internet of Things Journal, 2024. (accepted)

4. K. Xu, Y. Zhang, Y. Wang, T. Ohtsuki, B. Adebisi, H. Sari, and G. Gui, "Self-Supervised Learning Malware Traffic Classification Based on Masked Auto-Encoder," IEEE Internet of Things Journal, 2024. (accepted)

5. M. Bouazizi, A. L. Mora, K. Feghou, and T. Ohtsuki, "Activity Detection in Indoor Environments using Multiple 2D LiDARs" Sensors 2024. (accepted)

6. Z. Li, M. Bouazizi, T. Ohtsuki, M. Ishii, and E. Nakaraha, "Towards Building Trust in Machine Learning Models: Quantifying the Explainability by SHAP and References to Human Strategy," IEEE Access, accepted.

7. 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

8. 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 2023, 23(24), 9698; https://doi.org/10.3390/s23249698

9. M. Bouazizi, K. Yamamoto, K. Endo, and T. Ohtsuki, "A Novel Approach for Heartbeat Rate Estimation using 3D Lidar and Multi-Beam MIMO Doppler Radar," in IEEE Sensors Journal, doi: 10.1109/JSEN.2023.3330472.

10. 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, 2023. (Accepted)

11. 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 Deep Image Prior Map Reconstruction," IEEE Trans. on Vehicular Technology, 2023. (Accepted) 

12. 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 2023, 23(19), 8069; https://doi.org/10.3390/s23198069. (accepted)

13. 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, 2023 doi: 10.1109/JIOT.2023.3300689. (accepted)

14. C. Zheng, M. Bouazizi,T. Ohtsuki, M. Kitazawa, T. Horigome, and T. Kishimoto, "Detecting Dementia from Face-Related Features with Automated Computational Methods," Bioengineering, 2023, 10(7), 862, 2023

15. F. H. Panahi, F. H. Panahi, and T. Ohtsuki, "Intelligent Cellular Offloading with VLC-enabled Unmanned Aerial Vehicles," in IEEE Internet of Things Journal, 2023. (Accepted)

16. Y. Cao, T. Ohtsuki, S. Maghsudi, and To. Q. S. Quek, "Deep Learning and Image Super-Resolution-Guided Beam and Power Allocation for mmWave Networks," IEEE Trans. on Vehicular Technology, 2023. (Accepted)

17. R. Yoshizawa, K. Yamamoto, and T. Ohtsuki, "Investigation of Data Leakage in Deep Learning-based Blood Pressure Estimation using Photoplethysmogram/ Electrocardiogram," IEEE Sensors Journal 2023. (Accepted)

18. 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 Trans. on Wireless Communications, 2023. 

19. M. Bouazizi, A.-L. Mora, and T. Ohtsuki, "A 2D Lidar-equipped unmanned robot-based approach for indoor human activity detection," Sensors 2023. (Accepted)

20. 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.

21. 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.

22. 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.

23. F. H. Panahi, F. H. Panahi, and T. Ohtsuki, "An Intelligent Path Planning Mechanism for Firefighting in Wireless Sensor and Actor Networks," in IEEE Internet of Things Journal, 2023 (accepted).

24. 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.1, 2023.

25. 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 (Accepted).

26. 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, doi: 10.1109/TII.2022.3227641.

27. 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, doi: 10.1109/TMC.2021.3085206.

28. X. Shi, K. Yamamoto, T. Ohtsuki, Y. Matsui, and K. Owada, ``Unsupervised Learning-Based Non-Invasive Fetal ECG Muti-Level Signal Quality Assessment," Bioengineering, 2023, 10(1), 66.

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

30. F.H. Panahi, F.H. Panahi, and T. Ohtsuki, "A Reinforcement Learning-based Fire Warning and Suppression System Using Unmanned Aerial Vehicles," IEEE Transactions on Instrumentation & Measurement, 2022. (Accepted)

31. 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, Part A, Jan. 2023. (Accepted)

32. C. Zheng, M. Bouazizi, and T. Ohtsuki, "An Evaluation on Information Composition in Dementia Detection Based on Speech," IEEE Access, 2022. (Accepted)

33. 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, 2022. (Accepted)

34. T. Ohtsuki, "(Invite Paper) Machine Learning in 6G Wireless Communications,” IEICE Transactions on Communications, 2022. (Accepted)

35. Y. Shibata, W. Takabatake, K. Hoshino, A. Nagate, and T. Ohtsuki, ``Two-Step Dynamic Cell Optimization Algorithm for HAPS Mobile Communications," IEEE Access, 2022. (Accepted)

36. 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 July1, 2022, doi: 10.1109/JIOT.2021.3127186.

37. I. Seto, S. Otaka, H. Yoshida, K. Nonin, M. Nishikawa, T. Kato, Y. Nito, H. Ishikawa, and T. Ohtsuki, ``Sub-GHz Two-Way Ranging based on Phase Detection for Remote Keyless Entry Systems," IEEE Trans. on Vehicular Technology, 2022. (Accepted) 

38. 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. (Accepted)

39. R. Zhao, Y. Wang, Z. Xue, T. Ohtsuki, B. Adebisi, and G. Gui, "Semi-Supervised Federated Learning-Based Intrusion Detection Method for Internet of Things," IEEE Internet of Things Journal, 2022. (Accepted)

40. M. Bouazizi and T. Ohtsuki, ``Sarcasm Over Time and Across Platforms: Does the Way we Express Sarcasm Change?," IEEE Access, 2022. (Accepted)

41. 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, 2022. (Accepted)

42. 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,'' MDPI Information Special Issue Biomedical Signal Processing and Data Analytics in Healthcare Systems, 2022. (Accepted)

43. 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, 2022. (Accepted)

44. T. Nakamura, M. Bouazizi, K. Yamamoto, and T. Ohtsuki, "Wi-Fi-based Fall Detection Using Spectrogram Image of Channel State Information," IEEE Internet of Things Journal, 2022. (Accepted)

45. T. Kitagawa, K. Yamamoto, K. Endo, and T. Ohtsuki, "Multibeam Doppler Sensor-based Non-contact Heartbeat Detection Using Beam Diversity," IEEE Access, 2022. (Accepted)

46. 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, doi: 10.1109/TCCN.2021.3119945.

47. 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, 2021. (Accepted)

48. 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 Trans. on Communications, 2021. (Accepted)

49. Z. He, J. Yin, G. Gui, B. Adebisi, T. Ohtsuki, H. Gacanin, and H. Sari, "Edge Device Identification Based on Federated Learning and Network Traffic Feature Engineering," IEEE Trans. on Cognitive Communications and Networking, 2021. (Accepted)

50. J. Luo, M. Bouazizi, and T. Ohtsuki, "Data Augmentation for Sentiment Analysis Using Sentence Compression-based SeqGAN with Data Screening," IEEE Access, 2021. (Accepted)

51. 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 Trans. on Green Communications and Networking, 2021. (Accepted)

52. 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," IEEE Access, 2021.

53. X. Fu, G. Gui, Y. Wang, T. Ohtsuki, B. Adebisi, H. Gacanin, and F. Adachi, "Lightweight Automatic Modulation Classification Based on Decentralized Learning," IEEE Trans. on Cognitive Communications and Networking, 2021.

54. 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 Trans. on Cognitive Communications and Networking, 2021.

55. 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," IEEE Trans. on Communications, 2021.

56. 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, 2021.

57. 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 Network and Network Compression," IEEE Journal on Selected Areas on Communications, 2021 (Accepted).

58. 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, 2021. (Accepted)

59. 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, 2021. (Accepted)

60. A. Takahashi, O. Takyu, H. Fujiwara, T. Fujii, and T. Ohtsuki, ``Overloaded Wireless MIMO Switching for Information Exchanging through Untrusted Relay in SecureWireless Communication,” IEICE Transactions on Communications, 2021. (Accepted)

61. F.H. Panahi, and T. Ohtsuki, “Spectrum-Aware Energy Efficiency Analysis in K-tier 5G HetNets,” Electronics, 2021. (Accepted)

62. 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, 2021. (Accepted)

63. 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, 2021. (Accepted)

64. A. Yamada, T. Ohtsuki,  “Discrete BP Polar Decoder using Information Bottleneck Method,” IEEE Access, 2021. (Accepted) 

65. 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.

66. 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

67. C. Ye and T. Ohtsuki, “Spectral Viterbi algorithm for contactless wide-range heart rate estimation with deep clustering,” IEEE Transactions on Microwave Theory and Techniques, Feb. 2021, Early Access. doi: 10.1109/TMTT.2021.3054560 

68. 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, 2020 (Accepted)

69. D. Fang, X. Guan, Y. Peng, H. Chen, T. Ohtsuki, and H. Zhu, “Distributed Deep Reinforcement Learning for Renewable Energy Accommodation Assessment with Communication Uncertainty in Internet of Energy,” IEEE Internet of Things Journal, 2020 (Accepted)

70. Y. Kumar and T. Ohtsuki, “Influence and Mitigation of Pedestrian Blockage at mmWave Cellular Networks,” IEEE Trans. on Vehicular Technology (Accepted)

71. 石井方邦, 槇俊孝, 大森久美子, 大槻知明, “データ分析によるコンタクトセンタ効率化DX －いつだれがどこに電話をかければよいか－,” 情報処理学会論文誌トランザクションデジタルプラクティス, 2020. (Accepted)

72. Y. Cao, T. Ohtsuki, and T.Q.S. Quek, “Dual-Ascent Inspired Transmit Precoding for Evolving Multiple-Access Spatial Modulation,” IEEE Trans. on Communications, July 2020. (Accepted)

73. K. Yamamoto and T. Ohtsuki, "ECG Signal Reconstruction via Doppler Sensor by Hybrid Deep Learning Model with CNN and LSTM," IEEE Access, 2020. (Accepted)

74. Y. Deng and T. Ohtsuki, ``Low-Complexity Subspace MMSE Channel Estimation in Massive MU-MIMO System,” IEEE Access, 2020. (Accepted)

75. K. Yamamoto and T. Ohtsuki, "Non-contact Heartbeat Detection by Heartbeat Signal Reconstruction based on Spectrogram Analysis with Convolutional LSTM," IEEE Access, 2020. (Accepted)

76. Y. Liu, X. Guan, D. Sun, J. Li, T. Otsuki, 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.

77. 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 Trans. on Vehicular Technology (Accepted)

78. 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," IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2020. (Accepted)

79. J. Tachibana and T. Ohtsuki, ``Learning and Analysis of Damping Factor in Massive MIMO Detection using BP Algorithm with Node Selection," IEEE Access, vol. 8, pp.96859–96866, May 2020.

80. 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, 2020. (Accepted)

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

82. Y. Huang, X. Guan, H. Chen, Y. Liang, S. Yuan, and T. Ohtsuki, ``Risk Assessment of Private Information Inference for Motion Sensor Embedded IoT Devices," IEEE Trans. on Emerging Topics in Computational Intelligence, 2019. (Accepted)

83. D. Sun, Y. Liu, X.Guan, J. Li, and T. Otsuki, ``Evaluating Renewable Energy Accommodation Capability with Uncertain Generation Using Deep Reinforcement Learning," Future Generation Computer Systems, 2019. (Accepted)

84. 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.

85. 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. doi: 10.26599/BDMA.2019.9020002

86. 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.

87. 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.

88. C. Ye, K. Toyoda, and T. Ohtsuki, “Blind Source Separation on Non-contact Heartbeat Detection by Non-negative Matrix Factorization Algorithms ,” IEEE Transactions on Biomedical Engineering,  vol. 67, no. 2, pp. 482-494, Feb. 2020. doi: 10.1109/TBME.2019.2915762

89. L. Wang and T. Ohtsuki, ``Underdetermined Blind Source Separation with Multi-Subspace for Nonlinear Representation," IEEE Access, Vol. 7, pp. 84545-845572019, June 2019.

90. Y. Cao and T. Ohtsuki, ``Orthogonality Structure Designs for Generalized Precoding Aided Spatial Modulation," IEEE Wireless Communications Letters, May 2019. (Accepted)

91. 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.

92. 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.

93. 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.

94. C. Ye, K. Toyoda, and T. Ohtsuki, ``A Stochastic Gradient Approach for Robust Heartbeat Detection with Doppler Radar Using Time-Window-Variation Technique," IEEE Transactions on Biomedical Engineering, vol. 66, no. 6, pp. 1730-1741, June 2019.

95. 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.

96. 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.

97. 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.

98. 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.

99. 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.

100. F.H. Panahi, 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 Trans. on Green Communications and Networking, DOI: 10.1109/TGCN.2018.2844301, vol. 4, pp. 915-931, Dec. 2018.

101. 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.

102. 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.

103. T. Ohtsuki, ``(Invited Paper) Superposed Multicarrier Transmission,” ITE Transactions on Media Technology and Applications, Vol. 6, issue, pp. 91-97, 2017.

104. T. Ohtsuki, ``(Invite Paper) A Smart City Based on Ambient Intelligence,” IEICE Transactions on Communications, Vol.E100-B, No.9,  pp. 1547-1553, Sep. 2017. Download

105. 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,” IEEE Journal of Lightwave Technology, Vol. 35, no. 14, pp. 3082-3091, July 2017.

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

107. 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

108. 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.

109. 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.

110. 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.

111. R. Seno, T. Ohtsuki, W. Jiang, and Y. Takatori, ``Clustering Small Cells in Heterogeneous Networks with Interference Alignment," IEICE CoMEX, 2017. (Accepted)

112. 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.

113. 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.

114. 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.

115. 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. 370-37616, Feb. 2017.

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

117. H. Hayashi and T. Ohtsuki, ``DOA estimation for Wideband Signals Based on Weighted Squared TOPS," EURASIP Journal on Wireless Communications and Networking, 2016. (Accepted)

118. 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

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

120. 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.

121. 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.

122. 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 DOI: 10.1186/s13638-016-0699-9, Aug. 2016.

123. 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 DOI: 10.1186/s13638-015-0501-4, 2016.

124. 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

125. 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.

126. 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.

127. 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, DOI 10.1007/s11036-015-0589-0, Apr. 2015.

128. X. Guan, Y. Huang, Z. Cai, and T. Ohtsuki, “Intersection-Based Forwarding Protocol for Vehicular Ad Hoc Networks,” Telecommunication Systems, Springer Netherlands, DOI 10.1007/s11235-015-9983-y, Mar. 2015.

129. F.H. Panahi and T. Ohtsuki, “Stochastic Geometry Modeling and Analysis of Cognitive Heterogeneous Cellular Networks,” EURASIP Journal on Wireless Communications and Networking, 2015.

130. 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 doi:10.1186/s13638-015-0277-6, Mar. 2015.

131. 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 doi:10.1186/s13638-015-0268-7, Feb. 2015.

132. J. Hong and T. Ohtsuki, “Signal Eigenvector-based Device-Free Passive Localization using Array Sensor,” IEEE Trans. on Vehicular Technology, 2015.

133. 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, 2014.

134. X. Guan, Y. Huang, Z. Cai, and T. Ohtsuki, “Intersection-based Forwarding Protocol for Vehicular Ad Hoc Networks,” Telecommunication Systems, 2014.

135. D. Chaima and T. Ohtsuki, “Adaptive Q-Learning Cell Selection Method for Open-access Femtocell Networks: Multi- User Case,” Trans. of IEICE, EB, 2014.

136. H. Zhuang and T. Ohtsuki, “A Model Based on Poison Point Process for Downlink K Tiers Fractional Frequency Reuse Heterogeneous Networks,” Elsevier Physical Communications, 2014.

137. D. Chaima and T. Ohtsuki, “Cell Selection for Open-Acces Femtocell Networks: Learning in Changing Environment,” Elsevier Physical Communications, 2014.

138. J.C. Corena and T. Ohtsuki, “Pollution-Free Regenerating Codes With Fast Reconstruction Verification for Verifiable Cloud Storage,” Journal of Networks, 2014.

139. 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, 2014.

140. F.H. Panahi and T. Ohtsuki, “Optimal Channel-Sensing Scheme for Cognitive Radio Systems Based on Fuzzy Q-Learning,” Trans. of IEICE, EB, 2013.

141. 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, Volume 2013.

142. Y. Inatomi, J. Hong,  and T. Ohtsuki, “Hidden Markov Model BasedLocalization Using Array Antenna,” International Journal of Wireless Information Networks, 10.1007/s10776-013-0211-y, June 2013

143. 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

144. 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.

145. S. Tomii and T. Ohtsuki, “Learning Based Falling Detection Using Multiple Doppler Sensors,” Advances in Internet of Things (Accepted)

146. T. Kudo and T. Ohtsuki, “Cell Range Expansion Using Distributed Q-Learning in Heterogeneous Networks,” EURASIP Journal on Wireless Communications and Networking (Accepted)

147. 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. (accepted for publication)

148. O. Souihli and T. Ohtsuki, “Benefits of Rich Scattering in MIMO Channels: A Graph-Theoretical Perspective,” IEEE Communications Letters

149. J. Hong and T. Ohtsuki, “State Classification with Array Sensor using Support Vector Machine for Wireless Monitoring  Systems,” Trans. of IEICE, EB (accepted for publication)

150. 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. (accepted for publication)

151. 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. (accepted for publication)

152. J. Hong, S. Kawakami, C.N. Nyirenda, and T. Ohtsuki, “Array Antenna based Localization Using Spatial Smoothing Processing,” Journal of Communications, (accepted)

153. 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.

154. 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.

155. 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.-,Dec. 2011.(accepted for publication)

156. 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

157. H. Chen, Q. Wan, H. Chen, and T. Ohtsuki, “Robust DOA Estimation for Uncorrelated and Coherent Signals,” Trans. of IEICE, EB (accepted for publication)

158. O. Rodoriguez and T. Ohtsuki, “Improving Accuracy for Range-Based Localization in Multiple Target Wireless Sensor Networks,” International Scholarly Research Network (ISRN) Communications and Networking.

159. K. Matsumura and T. Ohtsuki, “Orthogonal Beamforming Using Gram-Schmidt Orthogonalization for Multi-User MIMO Downlink System,” EURASIP Journal on Wireless Communications and Networking. (accepted for publication)

160. S. Kawakami and T. Ohtsuki, “Localization Using Iterative Angle of Arrival Method Sharing Snapshots of Coherent Subarrays,” EURASIP Journal on Advances in Signal Processing. (accepted for publication)

161. N. Lynn, O. Takyu, K. Adachi, M. Nakagawa, and T. Ohtsuki, “An autonomous cooperative ARQ Protocol for Hybrid Mobile Wireless Sensor Networks,” Special issue on “Recent Advance on Distributed Sensor Systems & Applications” in the Journal of Communications (JCM, ISSN 1796-2021).(accepted for publication)

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

163. K. Mitsuyama, T. Ikeda, and T. Ohtsuki, “Performance Evaluation of Iterative LDPC-Coded MIMO OFDM System with Time Interleaving,” Trans. of IEICE, EA, 2010.

164. 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.

165. 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.

166. 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, Feb. 2010.

167. 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.

168. 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.

169. 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.

170. 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.

171. 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.

172. 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.

173. 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.

174. 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.

175. 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.

176. 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.

177. 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.

178. 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.

179. 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.

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

181. 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.

182. 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.

183. 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.

184. 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.

185. 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.

186. 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.

187. 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.

188. 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.

189. 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.

190. 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.

191. 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.

192. 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.

193. 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.

194. 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.

195. 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.

196. 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.

197. 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.

198. 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.

199. 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.

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

201. 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.

202. S. Teramoto and T. Ohtsuki, “Optical Wireless Sensor Network System Using Corner Cube Retroreflectors (CCRs),” EURASIP Journal on Wireless Communications and Networking, vol. 2005, no. 1, pp. 39–44, Mar. 2005.

203. 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.

204. 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）

205. 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.

206. 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.

207. 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.

208. 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.

209. 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), no. 6, pp. 773–783, June 2004.

210. 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.

211. 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.

212. 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.

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

214. 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.

215. 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.

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

217. 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.

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

219. 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.

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

221. 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非線形歪み補償法の特性評価,” 電子情報通信学会論文誌(B), no. 11, pp. 1865–1873, Nov. 2002.

222. 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.

223. 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), no. 1, pp. 20–30, Jan. 2002.

224. 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.

225. 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), no. 1, pp. 50–60, Jan. 2001.

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

227. 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), no. 12, pp. 1692–1702, Dec. 2000.

228. 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.

229. 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)，no. 8, pp. 1114–1124, Aug. 2000.

230. 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.

231. 松尾綾子, 松尾道人, 大槻知明, 笹瀬巌, 宇多川智之, “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)，no. 7, pp. 970–979, July 2000.

232. 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.

233. 松尾道人, 大槻知明, 笹瀬巌, 宇多川智之, “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.

234. 新宮秀樹, 蒲地嘉展, 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.

235. 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.

236. 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.

237. 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.

238. 蒲地嘉展, 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.

239. 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-I)，vol. J81-B-I, no. 12, pp. 861–871, Dec. 1998.

240. 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.

241. 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.

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

243. 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.

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

245. 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.

246. 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.

247. 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.

248. 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.

249. 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,” IEEE Journal of Lightwave Technology, vol. 14, no . 9, pp. 1963–1969, Sep. 1996.

250. 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.

251. 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.

252. 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.

253. 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.

254. 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.

255. 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.

256. 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.

257. 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.

258. 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.

259. 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.

260. 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.

261. 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.

262. 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.

263. 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.

264. 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

265. 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.