A cooperative sensing area expansion using orthogonal frequency based information collection method. - Mai Ohta; Takeo Fujii; Kazushi Muraoka; Masayuki Ariyoshi (CrownCom, 2009)

A Novel Method for Information Gathering by Using Orthogonal Narrowband Signal for Cooperative Sensing in Cognitive Radio. - Mai Ohta; Takeo Fujii; Kazushi Muraoka; Masayuki Ariyoshi (IEICE Trans. Commun., 2009)

Outlier detection methods of low SNR nodes for cooperative spectrum sensing. - Hung Vu Le; Mai Ohta; Kei Inage; Takeo Fujii; Kazushi Muraoka; Masayuki Ariyoshi (ISWCS, 2010)

A novel power controlled sensing information gathering for cooperative sensing on shared spectrum with primary spectrum. - Mai Ohta; Takeo Fujii; Kazushi Muraoka; Masayuki Ariyoshi (CrownCom, 2011)

Demonstration of Vehicle to Vehicle Communications over TV White Space. - Onur Altintas; Mitsuhiro Nishibori; Takuro Oshida; Chikara Yoshimura; Youhei Fujii; Kota Nishida; Yutaka Ihara; Masahiro Saito; Kazuya Tsukamoto; Masato Tsuru 001; Yuji Oie; Rama Vuyyuru; et al. (VTC Fall, 2011)

Channel Selection Statistics for Control Information Sharing within Cognitive Radio Networks. - Mai Ohta; Takamasa Kimura; Hasan Rajib Imam; Sean Rocke; Jingkai Su; Alexander M. Wyglinski; Takeo Fujii (VTC Fall, 2012)

Cooperative Sensing with Distributed Pre-Detection for Gathering Sensing Information on Shared Primary Spectrum. - Mai Ohta; Takeo Fujii; Kazushi Muraoka; Masayuki Ariyoshi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

Data tracking and effect of frequency offset to simultaneous collecting method for wireless sensor networks. - Ryo Myoenzono; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Sliiro Handa (ICTC, 2014)

Selection method of cluster head in wireless sensor networks of wireless physical conversion for spectrum sharing. - Shohei Fujii; Osamu Takyu; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (ICTC, 2015)

Signal bandwidth estimation with energy detector based on windowed FFT for cognitive radio system. - Kensaku Tamayama; Mai Ohta; Makoto Taromaru (ICTC, 2015)

Spectrum sensing and channel utilization prediction by Nth-order markov chain model. - Ryota Nakanishi; Mai Ohta; Makoto Taromaru (WCNC Workshops, 2015)

Optimization of Learning Time for Learning-Assisted Rendezvous Channel in Cognitive Radio System. - Osamu Takyu; Takayuki Yamakita; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (IEICE Trans. Commun., 2015)

Data Tracking and Effect of Frequency Offset to Simultaneous Collecting Method for Wireless Sensor Networks. - Ryo Myoenzono; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (Int. J. Distributed Sens. Networks, 2015)

Fundamental study of decomposition based on heterogeneous sensing data in physical conversion sensor networks. - Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Fumihito Sasamori; Shiro Handa; Mai Ohta; Takeo Fujii (APSIPA, 2016)

Highly efficient environment aware wireless sensor network. - Takeo Fujii; Shunsuke Takegi; Taiki Nakayama; Mai Ohta; Osamu Takyu (CCNC, 2016)

Multi-target tracking based on features of sensing results and wireless parameters for physical wireless parameter conversion sensor networks. - Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (RWS, 2016)

Novel two-stage spectrum sensing for energy detection with FFT. - Mai Ohta; Osamu Takyu; Takeo Fujii; Makoto Taromaru (WCNC, 2016)

Performance evaluation of multi-target tracking for PhyC-SN. - Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Fumihito Sasamori; Shiro Handa; Takeo Fujii; Mai Ohta (WCNC Workshops, 2016)

Multiband hierarchical ad hoc network with wireless environment recognition. - Toshiyuki Shizuoka; Osamu Takyu; Mai Ohta; Takeo Fujii (APSIPA, 2017)

Optimal cluster head selection and rotation of cognitive wireless sensor networks for simultaneous data gathering. - Shohei Fujii; Osamu Takyu; Fumihito Sasamori; Shiro Handa; Takeo Fujii; Mai Ohta (ICOIN, 2017)

Optimization of multi-channel access in learning assisted measurement of channel occupancy ratio by USRP. - Takumi Kimura; Osamu Takyu; Fumihito Sasamori; Shiro Handa; Takeo Fujii; Mai Ohta (ICOIN, 2017)

Spectrum edge decision method for energy detection with FFT. - Mai Ohta; Makoto Taromaru; Takeo Fujii; Osamu Takyu (ICOIN, 2017)

Multiple information collection with frequency offset compensation by utilizing physical wireless parameter conversion sensor network (PHY-C SN). - Koji Kakinuma; Takeo Fujii; Osamu Takyu; Mai Ohta (ICUFN, 2017)

Robust channel selection method under home electronics-derived electromagnetic wave interference. - Mai Ohta; Osamu Takyu; Takeo Fujii; Makoto Taromaru (ICUFN, 2017)

Control Signal Transmission Based on IFDMA and Receiver with Nonlinear Amplifier for Compensating Access Channel Mismatch. - Ryo Kurosawa; Osamu Takyu; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (VTC Fall, 2017)

Data Tracking Using Frequency Offset and SIC for Physical Wireless Conversion Sensor Networks. - Takehiro Sakai; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (WCNC Workshops, 2017)

Measurement Technique for Occupancy Ratio and Transition Ratio in Cognitive Radio System. - Hayato Soya; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (WCNC Workshops, 2017)

Fusion Center Controlled MAC Protocol for Physical Wireless Parameter Conversion Sensor Networks (PHY-C SN). - Koji Kakinuma; Mai Ohta; Osamu Takyu; Takeo Fujii (IEICE Trans. Commun., 2017)

Optimal cluster head selection and rotation of cognitive wireless sensor networks for simultaneous data gathering and long life system. - Osamu Takyu; Shohei Fujii; Youhei Akimoto; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (Int. J. Distributed Sens. Networks, 2017)

A Study on Radio Signal Identification Method for Spectrum Sharing. - Haruki Fujita; Mai Ohta (APSIPA, 2018)

Experimental Evaluation of Interference Robustness for Frequency Spectrum Sharing in WLAN Systems. - Hironori Godo; Osamu Takyu; Koichi Adachi; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (APSIPA, 2018)

A Signal Separation Method for Physical Wireless Parameter Conversion Sensor Networks Using K-Shortest Path. - Shuhei Yamasaki; Minato Oriuchi; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (APSIPA, 2018)

Experimental study of signaling with IFDMA modulation and nonlinear amplifying for recovering access channel mismatch. - Ryo Kurosawa; Osamu Takyu; Fumihito Sasamori; Shiro Handa; Mai Ohta; Takeo Fujii (ICOIN, 2018)

Modified rendezvous scheme with inferring access channel probability of slave by master. - Hayato Soya; Osamu Takyu; Keiichiro Shirai; Fumihito Sasamori; Shiro Handa; Mai Ohta; Takeo Fujii (ICOIN, 2018)

Measurement Experiments on 920 MHz Band for Spectrum Sharing with LoRaWAN. - Mai Ohta; Koichi Adachi; Naoki Aihara; Osamu Takyu; Takeo Fujii; Makoto Taromaru (VTC Fall, 2018)

Channel assignment based on predictions of sensing result and channel occupancy rate in PhyC-SN. - Osamu Takyu; Shohei Fujii; Fumihito Sasamori; Shiro Handa; Mai Ohta; Takeo Fujii (WCNC, 2018)

Transmit control and data separation in physical wireless parameter conversion sensor networks with event driven sensors. - Kyosuke Fukuda; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (WiSNet, 2018)

Fast Rendezvous Scheme with a Few Control Signals for Multi-Channel Cognitive Radio. - Hayato Soya; Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii; Fumihito Sasamori; Shiro Handa (IEICE Trans. Commun., 2018)

Recognition and Countermeasure to Hidden Terminal Problem by Packet Analysis in Wireless LAN. - Akinori Kamio; Fumihito Sasamori; Shiro Handa; Osamu Takyu; Mai Ohta; Takeo Fujii (APSIPA, 2019)

Network MIMO with Interference Cancellation for Cloud-Cooperated Wireless Sensor Networks. - Toshiki Nonaka; Takeo Fujii; Osamu Takyu; Mai Ohta (ICOIN, 2019)

Data Separation Considering Smoothness of Sensing Data in Physical Wireless Parameter Conversion Sensor Networks. - Shuhei Yamasaki; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Shiro Handa (ICOIN, 2019)

Transmission Timing Control Method for IoT Devices Equipped with Poor Oscillator. - Masaki Amano; Mai Ohta; Makoto Taromaru (ICUFN, 2019)

Optimal Channel Selection Rate of Slave Terminal for Rendezvous Channel Scheme based on Channel Occupancy Rate. - Yuki Nishio; Osamu Takyu; Hayato Soya; Mai Ohta; Takeo Fujii (ICUFN, 2019)

Spectrum Sharing Exploiting Spectrum Database for LPWA. - Yudai Yamazaki; Takeo Fujii; Osamu Takyu; Mai Ohta; Koichi Adachi (ICUFN, 2019)

Adaptive Transmission Control with Prediction of Sensing Results for PhyC-SN. - Kyosuke Fukuda; Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta; Fumihito Sasamori; Sliiro Handa (RWS, 2019)

Q-Learning Aided Resource Allocation and Environment Recognition in LoRaWAN With CSMA/CA. - Naoki Aihara; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (IEEE Access, 2019)

Adaptive Channel Assignment With Predictions of Sensor Results and Channel Occupancy Ratio in PhyC-SN. - Osamu Takyu; Keiichiro Shirai; Takeo Fujii; Mai Ohta (IEEE Access, 2019)

ID Insertion and Data Tracking with Frequency Offset for Physical Wireless Parameter Conversion Sensor Networks. - Osamu Takyu; Keiichiro Shirai; Mai Ohta; Takeo Fujii (Sensors, 2019)

Autonomous Decentralized Transmission Timing Control in Wireless Sensor Network. - Aoto Kaburaki; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (APSIPA, 2020)

Estimation of Desired power and Undesired power Using Chirp Demodulation and Evaluation of Accuracy. - Gaku Kobayashi; Osamu Takyu; Koichi Adachi; Mai Ohta; Takeo Fujii (APSIPA, 2020)

Spectrum Sharing for Internet of Things System in Periodic Transmission. - Mai Ohta; Masaki Amano; Makoto Taromaru (APSIPA, 2020)

Specification of Link Quality Degradation in WLAN based on MCS and Retransmission Flag. - Hirotaka Senda; Osamu Takyu; Akinori Kamio; Mai Ohta; Takeo Fujii (APSIPA, 2020)

Transmission Timing Adjustment Algorithm in IoT System Equipped with Low-cost Oscillator with Low Frequency Stability. - Masaki Amano; Mai Ohta; Makoto Taromaru (ICAIIC, 2020)

Data Fusion Method Exploiting Data Correlation for Physical Wireless Parameter Conversion Sensor Networks. - Kohei Natsume; Mai Ohta; Osamu Takyu; Takeo Fujii (ICOIN, 2020)

Adapting the number of replicas in the E-IRSA system using the power control. - Toshiki Nonaka; Takeo Fujii; Osamu Takyu; Mai Ohta (ICOIN, 2020)

Intra-System Interference Avoidance for Packet-Level Index Modulation in Internet of Things. - Mai Ohta; Takeo Fujii (APSIPA ASC, 2021)

DCT Compression Scheme for Wireless Sensor Information considering Spatial Correlation. - Kohei Natsume; Mai Ohta; Koichi Adachi; Osamu Takyu; Takeo Fujii (ICOIN, 2021)

Proposal of interference power occupancy estimation method using chirp demodulation. - Gaku Kobayashi; Osamu Takyu; Koichi Adachi; Mai Ohta; Takeo Fujii (ICUFN, 2021)

Channel Allocation for LoRaWanConsidering Intra-System and Inter-System Interferences. - Shinichiro Kakuda; Yudai Yamazaki; Keita Katagiri; Takeo Fujii; Osamu Takyu; Mai Ohta; Koichi Adachi (VTC Fall, 2021)

Transmission Timing Control Using ACK Signal in LoRaWAN. - Muying Chen; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (WCNC, 2021)

Packet-Level Index Modulation for LoRaWAN. - Koichi Adachi; Kohei Tsurumi; Aoto Kaburaki; Osamu Takyu; Mai Ohta; Takeo Fujii (IEEE Access, 2021)

Autonomous Decentralized Traffic Control Using Q-Learning in LPWAN. - Aoto Kaburaki; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (IEEE Access, 2021)

Optimal Construction of Access Rate to Superior Channel in Rendezvous Channel Based on Channel-Occupancy Ratio. - Yuki Nishio; Osamu Takyu; Hayato Soya; Keiichiro Shirai; Mai Ohta; Takeo Fujii (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

High-Sensitivity Detection Method for Signals in PhyC-SN. - Toshi Ito; Osamu Takyu; Mai Ohta; Takeo Fujii; Koichi Adachi (ICUFN, 2022)

Performance Evaluation of Highly Efficient Information Collection Methods by Trend Analysis of Sensor Information Using Pre-learning. - Ryuji Miyamoto; Osamu Takyu; Hiroshi Fujiwara; Koichi Adachi; Mai Ohta; Takeo Fujii (ICUFN, 2022)

Differential Packet Level Index Modulation for Low Power Wide Area System. - Mai Ohta; Takeo Fujii (ICUFN, 2022)

Simple Clock Drift Estimation and Compensation for Packet-Level Index Modulation and Its Implementation in LoRaWAN. - Kohei Tsurumi; Aoto Kaburaki; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (IEEE Internet Things J., 2022)

Estimation Based on Chirp Modulation for Desired and Interference Power and Channel Occupancy Ratio in LoRa. - Osamu Takyu; Gaku Kobayashi; Koichi Adachi; Mai Ohta; Takeo Fujii (Sensors, 2022)

Flexible Index Mapping Scheme for Packet-Level Index Modulation. - Kosuke Suzuki; Koichi Adachi; Mai Ohta; Osamu Takyu; Takeo Fujii (IEEE Wirel. Commun. Lett., 2022)

Channel Access Control Instead of Random Backoff Algorithm. - Takashi Imanaka; Mai Ohta; Makoto Taromaru (ICAIIC, 2023)

Frame Design for Differential Packet-Level Index Modulation implemented by LoRaWAN. - Hitoshi Yamasaki; Hiroki Matsuura; Mai Ohta; Makoto Taromaru (ICUFN, 2023)

Resource Allocation for Periodic Traffic in Wireless Sensor Network. - Aoto Kaburaki; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (WCNC, 2023)

Packet-Level Index Modulation Under Duty Cycle Constraints. - Ryogo Oya; Shinichiro Kakuda; Takeo Fujii; Osamu Takyu; Mai Ohta; Koichi Adachi (WPMC, 2023)

Position Estimation of Radio Source Based on Fingerprinting With Physical Wireless Parameter Conversion Sensor Networks. - Masafumi Oda; Osamu Takyu; Mai Ohta; Takeo Fujii; Koichi Adachi (IEEE Access, 2023)

Three Level Recognition Based on the Average of the Phase Differences in Physical Wireless Parameter Conversion Sensor Networks and Its Effect to Localization with RSSI. - Toshi Ito; Masafumi Oda; Osamu Takyu; Mai Ohta; Takeo Fujii; Koichi Adachi (Sensors, 2023)

Data Gathering Method with High Accuracy of Environment Recognition Using Mathematical Optimization in Packet-Level Index Modulation. - Ryuji Miyamoto; Osamu Takyu; Hiroshi Fujiwara; Koichi Adachi; Mai Ohta; Takeo Fujii (IEICE Trans. Commun., 2023)

A Study on Packet-Level Index Modulation Using Frequency Offsets within a LoRaWAN Channel. - Mai Ohta; Hiroki Matsuura; Takeo Fujii (APSIPA, 2024)

Characterization of Discrimination of Number of Signal Collision Sensors Using Spectral Fluctuation Caused by Frequency Offset in Physical Wireless Parameter Conversion Sensor Networks. - Toshi Ito; Osamu Takyu; Mai Ohta; Takeo Fujii; Koichi Adachi (ICAIIC, 2024)

LBT-Based Resource Allocation Methods Utilizing Periodicity of Traffic in LPWAN. - Aoto Kaburaki; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (ICNC, 2024)

Novel Environmental Recognition Scheme with Mobile Data Gathering Station in Physical Wireless Parameter Conversion Sensor Networks. - Toshi Ito; Osamu Takyu; Mai Ohta; Takeo Fujii; Koichi Adachi (VTC Fall, 2024)

Received Signal Aided Implicit Node Clustering in LPWAN. - Takahiro Saraya; Aoto Kaburaki; Koichi Adachi; Osamu Takyu; Takeo Fujii; Mai Ohta (VTC Spring, 2024)

An Environment-Aware Adaptive Data-Gathering Method for Packet-Level Index Modulation in LPWA. - Osamu Takyu; Keita Takeda; Ryuji Miyamoto; Koichi Adachi; Mai Ohta; Takeo Fujii (Sensors, 2024)

Adaptive Resource Allocation Utilizing Periodic Traffic and Clock Drift in LPWAN. - Aoto Kaburaki; Koichi Adachi; Osamu Takyu; Mai Ohta; Takeo Fujii (IEEE Trans. Wirel. Commun., 2024)

Packet-Level Index Modulation Based on Channel Activity Detection. - Kosuke Suzuki; Koichi Adachi; Mai Ohta; Osamu Takyu; Takeo Fujii (IEEE Trans. Wirel. Commun., 2024)

An Effect of Temperature on Packet-Level Index Modulation for IoT. - Hitoshi Yamasaki; Hiroki Matsuura; Mai Ohta; Makoto Taromaru (ICAIIC, 2025)