Koichi Adachi

Publication Activity (10 Years)

Years Active: 2006-2024
Publications (10 Years): 54

Top Topics

Wireless Sensor

Activity Detection

Resource Allocation

Top Venues

Publications

Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
Adaptive Resource Allocation Utilizing Periodic Traffic and Clock Drift in LPWAN. IEEE Trans. Wirel. Commun. 23 (4) (2024)
Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
LBT-Based Resource Allocation Methods Utilizing Periodicity of Traffic in LPWAN. ICNC (2024)
Hayato Mukasa, Koshiro Aruga, Takeo Fujii, Koichi Adachi
Indoor Wireless Environment Visualization for Smart Factories. ICOIN (2024)
Hiroto Shida, Aoto Kaburaki, Koichi Adachi
Energy-Efficient Multi-Hop LoRaWAN with Transmission and Synchronization Control. ICNC (2024)
Osamu Takyu, Keita Takeda, Ryuji Miyamoto, Koichi Adachi, Mai Ohta, Takeo Fujii
An Environment-Aware Adaptive Data-Gathering Method for Packet-Level Index Modulation in LPWA. Sensors 24 (8) (2024)
Toshi Ito, Osamu Takyu, Mai Ohta, Takeo Fujii, Koichi Adachi
Characterization of Discrimination of Number of Signal Collision Sensors Using Spectral Fluctuation Caused by Frequency Offset in Physical Wireless Parameter Conversion Sensor Networks. ICAIIC (2024)
Kosuke Suzuki, Koichi Adachi, Mai Ohta, Osamu Takyu, Takeo Fujii
Packet-Level Index Modulation Based on Channel Activity Detection. IEEE Trans. Wirel. Commun. 23 (4) (2024)
Toshi Ito, Masafumi Oda, Osamu Takyu, Mai Ohta, Takeo Fujii, Koichi Adachi
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. Sensors 23 (6) (2023)
Ryota Kumada, Koichi Adachi
Interference Cancelation for Coexistence of LoRaWAN With Wireless Power Transfer. IEEE Internet Things J. 10 (15) (2023)
Ryogo Oya, Shinichiro Kakuda, Takeo Fujii, Osamu Takyu, Mai Ohta, Koichi Adachi
Packet-Level Index Modulation Under Duty Cycle Constraints. WPMC (2023)
Ryuji Miyamoto, Osamu Takyu, Hiroshi Fujiwara, Koichi Adachi, Mai Ohta, Takeo Fujii
Data Gathering Method with High Accuracy of Environment Recognition Using Mathematical Optimization in Packet-Level Index Modulation. IEICE Trans. Commun. 106 (12) (2023)
Takumi Tanagi, Koichi Adachi
Dynamic Path Planning for QoS Improvement in Multiple Automated Guided Vehicles. APWCS (2023)
Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
Resource Allocation for Periodic Traffic in Wireless Sensor Network. WCNC (2023)
Masafumi Oda, Osamu Takyu, Mai Ohta, Takeo Fujii, Koichi Adachi
Position Estimation of Radio Source Based on Fingerprinting With Physical Wireless Parameter Conversion Sensor Networks. IEEE Access 11 (2023)
Osamu Takyu, Gaku Kobayashi, Koichi Adachi, Mai Ohta, Takeo Fujii
Estimation Based on Chirp Modulation for Desired and Interference Power and Channel Occupancy Ratio in LoRa. Sensors 22 (11) (2022)
Jiaqi Zou, Rui Liu, Chenwei Wang, Yuanhao Cui, Zixuan Zou, Songlin Sun, Koichi Adachi
Aiming in Harsh Environments: A New Framework for Flexible and Adaptive Resource Management. CoRR (2022)
Toshi Ito, Osamu Takyu, Mai Ohta, Takeo Fujii, Koichi Adachi
High-Sensitivity Detection Method for Signals in PhyC-SN. ICUFN (2022)
Kohei Tsurumi, Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
Simple Clock Drift Estimation and Compensation for Packet-Level Index Modulation and Its Implementation in LoRaWAN. IEEE Internet Things J. 9 (16) (2022)
Jiaqi Zou, Rui Liu, Chenwei Wang, Yuanhao Cui, Zixuan Zou, Songlin Sun, Koichi Adachi
Aiming in Harsh Environments: A New Framework for Flexible and Adaptive Resource Management. IEEE Netw. 36 (4) (2022)
Ryuji Miyamoto, Osamu Takyu, Hiroshi Fujiwara, Koichi Adachi, Mai Ohta, Takeo Fujii
Performance Evaluation of Highly Efficient Information Collection Methods by Trend Analysis of Sensor Information Using Pre-learning. ICUFN (2022)
Kosuke Suzuki, Koichi Adachi, Mai Ohta, Osamu Takyu, Takeo Fujii
Flexible Index Mapping Scheme for Packet-Level Index Modulation. IEEE Wirel. Commun. Lett. 11 (4) (2022)
Muying Chen, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
Transmission Timing Control Using ACK Signal in LoRaWAN. WCNC (2021)
Koichi Adachi, Kohei Tsurumi, Aoto Kaburaki, Osamu Takyu, Mai Ohta, Takeo Fujii
Packet-Level Index Modulation for LoRaWAN. IEEE Access 9 (2021)
Shinichiro Kakuda, Yudai Yamazaki, Keita Katagiri, Takeo Fujii, Osamu Takyu, Mai Ohta, Koichi Adachi
Channel Allocation for LoRaWanConsidering Intra-System and Inter-System Interferences. VTC Fall (2021)
Naotaka Hirayama, Takuya Kobayashi, Koichi Adachi
Offloading Selection with Unequal Timeslot in Mobile Edge Computing. APSIPA ASC (2021)
Katsuya Suto, Shinsuke Bannai, Koya Sato, Kei Inage, Koichi Adachi, Takeo Fujii
Image-Driven Spatial Interpolation With Deep Learning for Radio Map Construction. IEEE Wirel. Commun. Lett. 10 (6) (2021)
Hendrik Lumbantoruan, Koichi Adachi
Array antenna equipped UAV-BS for efficient low power WSN and its theoretical analysis. IET Commun. 15 (16) (2021)
Koya Sato, Katsuya Suto, Kei Inage, Koichi Adachi, Takeo Fujii
Space-Frequency-Interpolated Radio Map. IEEE Trans. Veh. Technol. 70 (1) (2021)
Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
Autonomous Decentralized Traffic Control Using Q-Learning in LPWAN. IEEE Access 9 (2021)
Gaku Kobayashi, Osamu Takyu, Koichi Adachi, Mai Ohta, Takeo Fujii
Proposal of interference power occupancy estimation method using chirp demodulation. ICUFN (2021)
Kohei Natsume, Mai Ohta, Koichi Adachi, Osamu Takyu, Takeo Fujii
DCT Compression Scheme for Wireless Sensor Information considering Spatial Correlation. ICOIN (2021)
Riku Yamabe, Mikihiko Nishiara, Osamu Takyu, Koichi Adachi
Achievable Rate Enhancement Based on Multi-Packet Indexing in Packet-Level Index Modulation. IEEE Access 9 (2021)
Hendrik Lumbantoruan, Koichi Adachi
Trajectory and Communication Protocol for Efficient Data Collecting in UAV-Enabled WSN. ICOIN (2020)
Kosuke Suzuki, Naoki Aihara, Koichi Adachi, Satoshi Yamazaki
Autonomous Decentralized Frequency Resource Allocation using ACK Signal in LoRaWAN. WPMC (2020)
Takuya Kobayashi, Koichi Adachi
Probabilistic Binary Offloading for Wireless Powered Mobile Edge Computing System. APSIPA (2020)
Gaku Kobayashi, Osamu Takyu, Koichi Adachi, Mai Ohta, Takeo Fujii
Estimation of Desired power and Undesired power Using Chirp Demodulation and Evaluation of Accuracy. APSIPA (2020)
Kazunari Takahashi, Koichi Adachi
Base Station Operation Based on Affinity Propagation in Cellular Networks. ICOIN (2020)
Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
Autonomous Decentralized Transmission Timing Control in Wireless Sensor Network. APSIPA (2020)
Miho Musashi, Koichi Adachi
Spectrum Database Aided Prior Vacant Frequency Band Detection for Spectrum Sharing. ICAIIC (2020)
Miho Tanaka, Kenichi Nagasue, Jun Ogawa, Akira Yokomichi, Yoshihiro Ando, Takayuki Ojima, Toshiyuki Shizuoka, Koichi Adachi, Takeo Fujii
Proactive Cache System Using Cellular-Radio Information on MEC. ICUFN (2019)
Hendrik Lumbantoruan, Koichi Adachi
Array Antenna for Power Saving of Sensor Nodes in UAV-BS enabled WSN. ICNC (2019)
Ryuji Kobayashi, Koichi Adachi
Radio and Computing Resource Allocation for Minimizing Total Processing Completion Time in Mobile Edge Computing. IEEE Access 7 (2019)
Yudai Yamazaki, Takeo Fujii, Osamu Takyu, Mai Ohta, Koichi Adachi
Spectrum Sharing Exploiting Spectrum Database for LPWA. ICUFN (2019)
Jumpei Kawakami, Hendrik Lumbantoruan, Koichi Adachi
NOMA Based UAV Relay Communication Protocol in Cellular Network. APSIPA (2019)
Naoki Aihara, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii
Q-Learning Aided Resource Allocation and Environment Recognition in LoRaWAN With CSMA/CA. IEEE Access 7 (2019)
Yusuke Sunada, Koichi Adachi, Yasushi Yamao
Throughput Analysis of Dynamic Multi-Hop Network Under High Traffic Load. ICUFN (2018)
Naoki Aihara, Koichi Adachi
Orthogonal Resource Allocation Using SVM for CSMA/CA. APSIPA (2018)
Le Tien Trien, Koichi Adachi, Yasushi Yamao
Packet relay-assisted V2V communication with sectorised relay station employing payload combining scheme. IET Commun. 12 (4) (2018)
Hironori Godo, Osamu Takyu, Koichi Adachi, Mai Ohta, Takeo Fujii, Fumihito Sasamori, Shiro Handa
Experimental Evaluation of Interference Robustness for Frequency Spectrum Sharing in WLAN Systems. APSIPA (2018)
Le Tien Trien, Koichi Adachi, Yasushi Yamao
Efficient CSMA/CA Packet Relay-Assisted Scheme with Payload Combining for ITS V2V Communication. J. Inf. Process. 26 (2018)
Mai Ohta, Koichi Adachi, Naoki Aihara, Osamu Takyu, Takeo Fujii, Makoto Taromaru
Measurement Experiments on 920 MHz Band for Spectrum Sharing with LoRaWAN. VTC Fall (2018)
Ernest Kurniawan, Peng Hui Tan, Koichi Adachi, Sumei Sun
Hybrid Group Paging for Massive Machine-Type Communications in LTE Networks. GLOBECOM (2017)
Ashim Khadka, Koichi Adachi, Sumei Sun, Junyuan Wang, Huiling Zhu, Jiangzhou Wang
Cooperative Transmission Strategy over Users' Mobility for Downlink Distributed Antenna Systems. GLOBECOM (2017)
Koichi Adachi, Maodong Li, Peng Hui Tan, Yuan Zhou, Sumei Sun
Q-Learning Based Intelligent Traffic Steering in Heterogeneous Network. VTC Spring (2016)
Koichi Adachi, Jingon Joung, Yuan Zhou, Sumei Sun
A Distributed Resource Reservation Scheme for Handover Failure Reduction. IEEE Wirel. Commun. Lett. 4 (5) (2015)
Ashim Khadka, Koichi Adachi, Sumei Sun, Huiling Zhu, Jiangzhou Wang
Cooperative Transmission Strategy for Downlink Distributed Antenna Systems over Time-Varying Channel. GLOBECOM (2015)
Koichi Adachi
Global Communications Newsletter. IEEE Commun. Mag. 53 (9) (2015)
Sumei Sun, Koichi Adachi, Peng Hui Tan, Yuan Zhou, Jingon Joung, Chin Keong Ho
Heterogeneous network: An evolutionary path to 5G. APCC (2015)
Sumei Sun, Peng Hui Tan, Yuan Zhou, Koichi Adachi, Maodong Li
AP based traffic steering for LTE-Wi-Fi networks. ICCC (2015)
Jingon Joung, Chin Keong Ho, Koichi Adachi, Sumei Sun
A Survey on Power-Amplifier-Centric Techniques for Spectrum- and Energy-Efficient Wireless Communications. IEEE Commun. Surv. Tutorials 17 (1) (2015)
Koichi Adachi, Kazuki Takeda, Sumei Sun, Fumiyuki Adachi
Joint Cooperative-Transmit and Receive FDE for Single-Carrier Incremental Relaying. IEEE Trans. Veh. Technol. 62 (1) (2013)
Poramate Tarasak, Koichi Adachi, Sumei Sun
Cell selection for TDD two-tier cellular networks based on uplink-downlink capacity. WCNC (2013)
Koichi Adachi, Jingon Joung, Sumei Sun, Peng Hui Tan
Adaptive Coordinated Napping (CoNap) for Energy Saving in Wireless Networks. IEEE Trans. Wirel. Commun. 12 (11) (2013)
Koichi Adachi, Sumei Sun
Power-efficient dynamic BS muting in clustered cellular system. PIMRC (2012)
Koichi Adachi, Sumei Sun
Inter-Sector Cooperative Relaying for Network Power Minimization. VTC Spring (2012)
Tetsuya Yamamoto, Koichi Adachi, Sumei Sun, Fumiyuki Adachi
Recursive QR packet combining for uplink single-carrier multi-user MIMO HARQ using near ML detection. IWCMC (2012)
Koichi Adachi, Jingon Joung, Sumei Sun, Peng Hui Tan
Energy-saving coordinated napping (CoNap) for wireless networks. GLOBECOM Workshops (2012)
Tetsuya Yamamoto, Koichi Adachi, Sumei Sun, Fumiyuki Adachi
Recursive QR packet combining for uplink single-carrier multi-user MIMO HARQ using near ML detection. Wirel. Commun. Mob. Comput. 12 (18) (2012)
Koichi Adachi, Sumei Sun, Chin Keong Ho
Power Minimization of Cooperative Relay Transmission with Relay's Private Information. IEEE Trans. Wirel. Commun. 11 (7) (2012)
Koichi Adachi, Sumei Sun, Chin Keong Ho
Power Minimization of Cooperative Relay Transmission with Relay's Private Information. VTC Fall (2011)
Kazunori Yamamoto, Koichi Adachi, Tomoaki Ohtsuki
Phase Rotation Sequence Selection Method for IFDMA with DDCE. VTC Spring (2011)
Hironori Kizuka, Koichi Adachi, Tomoaki Ohtsuki
Frequency Band Allocation in MIMO System Based on Received Power Difference among Users. VTC Spring (2011)
Kazuki Takeda, Koichi Adachi, Sumei Sun, Fumiyuki Adachi
Single-Carrier Incremental Relaying with Joint Tx/Rx FDE. VTC Fall (2011)
Nandar Lynn, Osamu Takyu, Koichi Adachi, Masao Nakagawa, Tomoaki Ohtsuki
An Autonomous Selective Cooperative ARQ Protocol for Hybrid Mobile Wireless Sensor Networks. J. Commun. 6 (2) (2011)
Yu Hemmi, Koichi Adachi, Tomoaki Ohtsuki
Subcarrier Mapping for Single-User SC-FDMA Relay Communications. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (12) (2011)
Kyohei Takano, Koichi Adachi, Tomoaki Ohtsuki
Transmit and Receive Weights in Vector Coding with Channel Estimation Error and Feedback Delay. GLOBECOM (2011)
Koichi Adachi, Sumei Sun, Jingon Joung
Cooperative Relay Transmission with Relay's Private Information. VTC Spring (2011)
Yuichi Kazama, Akira Yamasaki, Koichi Adachi, Masao Nakagawa
Impact of Frequency Diversity and Multi-User Diversity in IFDMA. VTC Spring (2010)
Koichi Adachi, Masao Nakagawa
Iterative Interference Cancellation for Multi-Code PR/MC-CDMA. WCNC (2010)
Koichi Adachi, Masao Nakagawa
On the Construction of Orthogonal Spreading Code Groups for MC-CDMA with FDE in a Frequency Selective Channel. IEICE Trans. Commun. (3) (2010)
Takeo Yamasaki, Osamu Takyu, Koichi Adachi, Yohtaro Umeda, Masao Nakagawa
Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (12) (2010)
Koichi Adachi, Masao Nakagawa
Phase Rotation/MC-CDMA for Uplink Transmission. MCSS (2009)
Koichi Adachi, Masao Nakagawa
On the construction of orthogonal spreading code groups for MC-CDMA with FDE in a frequency selective channel. WCNC (2009)
Koichi Adachi, Fumiyuki Adachi, Masao Nakagawa
Channel Capacity of MC-CDMA and Impact of Residual ICI. IEICE Trans. Commun. (1) (2009)
Koichi Adachi, Fumiyuki Adachi, Masao Nakagawa
Virtual MIMO Space Division Multiplexing for MC-CDMA. VTC Fall (2009)
Koichi Adachi, Fumiyuki Adachi, Masao Nakagawa
On Cellular MIMO Channel Capacity. IEICE Trans. Commun. (7) (2008)
Koichi Adachi, Masao Nakagawa
Bit-Wise Error Detection Based Iterative Signal Detection for OFDM MIMO Multiplexing. WCNC (2008)
Koichi Adachi, Fumiyuki Adachi, Masao Nakagawa
Cellular MIMO Channel Capacities of MC-CDMA and OFDM. VTC Spring (2008)
Koichi Adachi, Masao Nakagawa
Iterative Modified QRD-M Based on CRC Codes for OFDM MIMO Multiplexing. IEICE Trans. Commun. (6) (2007)
Koichi Adachi, Fumiyuki Adachi, Masao Nakagawa
On Cellular MIMO Spectrum Efficiency. VTC Fall (2007)
Koichi Adachi, Masao Nakagawa
Theoretical Analysis of Decision Directed Block Iterative Channel Estimation for OFDM Mobile Radio. IEICE Trans. Commun. (7) (2007)
Yuki Fukuyama, Osamu Takyu, Koichi Adachi, Masao Nakagawa
Relay Method of Sending Soft Decision Symbol Based on the Result of Error Detecting Code in Cooperative Communication. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (11) (2007)
Koichi Adachi, Masao Nakagawa
LDPC Coded Iterative Signal Detection Based on QRD-M with CRC Check. VTC Fall (2006)
Yuki Fukuyama, Osamu Takyu, Koichi Adachi, Masao Nakagawa
Relay method of sending soft decided symbol in cooperative communication. Communication Systems and Networks (2006)
Koichi Adachi, Riaz Esmailzadeh, Masao Nakagawa
Iterative QRM-MLD with Pilot-Assisted Decision Directed Channel Estimation for OFDM MIMO Multiplexing. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (7) (2006)
Koichi Adachi, Masao Nakagawa
Iterative Modified QRM-MLD Based on CRC Check for OFDM MIMO Multiplexing. VTC Spring (2006)