論文 - 安達　宏一

Channel Phase Nonreciprocity Compensation for Space-Frequency Line Coded OFDM Systems

Han-Gyeol Lee, Jihoon Choi, Juyeop Kim, Koichi Adachi, Yue Xiao, Jingon Joung

IEEE Access 2025年06月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Transmit Antenna Selection Using Gated Recurrent Units for UAV-to-LEO Satellite Communications

Jaehong Kim, Seok-Jin Hong, Koichi Adachi, Jian Zhao, Eui-Rim Jeong, Jingon Joung

IEEE Transactions on Vehicular Technology （IEEE）     1 - 6 2025年05月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Transmission Timing and Synchronization Control for Energy-Efficient Multi-Hop LoRaWAN

Hiroto Shida, Aoto Kaburaki, Koichi Adachi

IEEE Access 12   183195 - 183204 2024年11月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Tackling Hidden Node Problem Utilizing Traffic Periodicity and Downlink Carrier Sense in LPWAN

Aoto Kaburaki, Koichi Adachi, Osamu Takyu

IEEE Internet of Things Journal 12 （ 6 ） 6536 - 6547 2024年11月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Differential Space-Time Line Codes

Jingon Joung, Koichi Adachi, Chau Yuen

IEEE Transactions on Vehicular Technology （Institute of Electrical and Electronics Engineers (IEEE)）  73 （ 10 ） 15837 - 15842 2024年10月

研究論文（学術雑誌）, 査読有り,  ISSN  0018-9545

• Access to Document (DOI)

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

The 2024 IEEE 100th Vehicular Technology Conference (VTC2024-Fall)    1 - 5 2024年10月

研究論文（国際会議プロシーディングス）, 査読有り

FSF-LoRa: Fractional-Spreading-Factor-LoRa for Flexible Resource Allocation

Ryoya Saito, Koichi Adachi

The 2024 IEEE 100th Vehicular Technology Conference (VTC2024-Fall)    1 - 5 2024年10月

研究論文（国際会議プロシーディングス）, 責任著者, 査読有り

Indoor Radio Environment Map Construction Using Node Position Estimation for Smart Factories

Hayato Mukasa, Kohei Yuzawa, Takeo Fujii, Koichi Adachi

IEEE Int. Symp. on Personal, Indoor and Mobile Radio Commun. 3rd Workshop on Integrated, Intelligent and Ubiquitous Connectivity for 6G    1 - 5 2024年09月

研究論文（国際会議プロシーディングス）, 査読有り

Radio Resource Allocation Scheme Considering Future Channel Conditions Based on Radio Environment Map

Kotaro Yoshikawa, Takumi Tanagi, Koichi Adachi

The 20th IEEE Asia Pacific Wireless Commun. Symp. (APWCS 2024)    1 - 5 2024年08月

研究論文（国際会議プロシーディングス）, 責任著者, 査読有り

Chirp Index Space Partitioning Based Multiple Access Technique

Hinata Sakamoto, Koichi Adachi

The 15th Int. Conf. on Ubiquitous and Future Networks (ICUFN 2024),    1 - 5 2024年07月

研究論文（国際会議プロシーディングス）, 責任著者, 査読有り

Resource Management for Wireless Power Transfer and Wireless Information Transfer in Industrial IoT

Daichi Watabe, Kotaro Yoshikawa, Koichi Adachi

The 5th Int. Workshop on Smart Radio for IoT Era (SRIoT 2024), The 15th Int. Conf. Ubiquitous and Future Netw. (ICUFN 2024)    1 - 5 2024年07月

研究論文（国際会議プロシーディングス）, 責任著者, 査読有り

Received Signal Aided Implicit Node Clustering in LPWAN

Takahiro Saraya, Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Takeo Fujii, Mai Ohta

IEEE Veh. Technol. Conf. (VTC’24)-spring    1 - 5 2024年06月

研究論文（国際会議プロシーディングス）, 責任著者, 査読有り

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 （MDPI AG）  24 （ 8 ） 2514 - 2514 2024年04月

研究論文（学術雑誌）, 査読有り

　概要を見る

Low-power wide-area (LPWA) is a communication technology for the IoT that allows low power consumption and long-range communication. Additionally, packet-level index modulation (PLIM) can transmit additional information using multiple frequency channels and time slots. However, in a competitive radio access environment, where multiple sensors autonomously determine packet transmission, packet collisions occur when transmitting the same information. The packet collisions cause a reduction in the throughput. A method has been proposed to design a mapping table that shows the correspondence between indexes and information using a packet collision minimization criterion. However, the effectiveness of this method depends on how the probability of the occurrence of the information to be transmitted is modeled. We propose an environment-aware adaptive data-gathering method that identifies the location of factors affecting sensor information and constructs a model for the probability of the occurrence of sensor information. The packet collision rate of the environment-aware adaptive data-gathering method was clarified through computer simulations and actual experiments on a 429 MHz LPWA. We confirm that the proposed scheme improves the packet collision rate by 15% in the computer simulation and 30% in the experimental evaluation, respectively.

• Access to Document (DOI)

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 24 （ 8 ）  2024年04月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Adaptive Resource Allocation Utilizing Periodic Traffic and Clock Drift in LPWAN

Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii

IEEE Transactions on Wireless Communications （Institute of Electrical and Electronics Engineers (IEEE)）  23 （ 4 ） 3795 - 3807 2024年04月

研究論文（学術雑誌）, 査読有り,  ISSN  1536-1276

• Access to Document (DOI)

Packet-Level Index Modulation Based on Channel Activity Detection

Kosuke Suzuki, Koichi Adachi, Mai Ohta, Osamu Takyu, Takeo Fujii

IEEE Transactions on Wireless Communications （Institute of Electrical and Electronics Engineers (IEEE)）  23 （ 4 ） 2812 - 2823 2024年04月

研究論文（学術雑誌）, 査読有り,  ISSN  1536-1276

• Access to Document (DOI)

Energy-Efficient Multi-hop LoRaWAN with Transmission and Synchronization Control,

Hiroto Shida, Aoto Kaburaki, Koichi Adachi

Int. Conf. on Computing, Netw. and Commun. (ICNC 2024)    1 - 5 2024年02月

研究論文（国際会議プロシーディングス）, 責任著者, 査読有り

Microwave Power Transmission Using a Signal-to-Leakage-and-Noise Ratio to Protect Wireless Communication Devices

Shun Shibuya, Koichi Adachi, Hiroyuki Morikawa, Yoshiaki Narusue

IEICE Communications Express 13 （ 2 ） 39 - 42 2024年02月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

LBT-based Resource Allocation Methods Utilizing Periodicity of Traffic in LPWAN

Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii

Int. Conf. on Computing, Netw. and Commun. (ICNC 2024)    1 - 5 2024年02月

研究論文（学術雑誌）, 査読有り

Indoor Wireless Environment Visualization for Smart Factories

Hayato Mukasa, Koshiro Aruga, Takeo Fujii, Koichi Adachi

ICOIN 2024    1 - 5 2024年01月

研究論文（国際会議プロシーディングス）, 査読有り

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 Transactions on Communications （Institute of Electrical and Electronics Engineers (IEEE)）  E106.B （ 12 ） 1337 - 1349 2023年12月

研究論文（学術雑誌）, 査読有り,  ISSN  0916-8516

• Access to Document (DOI)

Transmission Control for Highly Efficiency Data Gathering in Packet-Level Index Modulation

Ryuji Miyamoto, Osamu Takyu, Hiroshi Fujiwara, Koichi Adachi, Mai Ohta, Takeo Fujii

Int. Conf. on Emerging Technol. for Commun. (ICETC'24)    1 - 5 2023年12月

研究論文（国際会議プロシーディングス）, 査読有り

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

The 26th Int. Symp. on Wireless Personal Multimedia Commun. (WPMC 2023)    1 - 5 2023年11月

研究論文（国際会議プロシーディングス）, 査読有り

Packet-Level Index Modulation under Duty Cycle Constraints

Ryogo Ohta, Shinichiro Kakuda, Takeo Fujii, Osamu Takyu, Mai Ohta, Koichi Adachi

The 26th Int. Symp. on Wireless Personal Multimedia Commun. (WPMC 2023)    1 - 5 2023年11月

研究論文（国際会議プロシーディングス）, 査読有り

Interference Cancelation for Coexistence of LoRaWAN With Wireless Power Transfer

Ryota Kumada, Koichi Adachi

IEEE Internet of Things Journal （Institute of Electrical and Electronics Engineers (IEEE)）  10 （ 15 ） 13109 - 13122 2023年08月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Dynamic Path Planning for QoS Improvement in Multiple Automated Guided Vehicles

Takumi Tanagi, Koichi Adachi

2023 VTS Asia Pacific Wireless Commun. Symp. (APWCS)    1 - 5 2023年08月

研究論文（国際会議プロシーディングス）, 責任著者, 査読有り

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 （MDPI AG）  23 （ 6 ） 3308 - 3308 2023年03月

研究論文（学術雑誌）, 査読有り

　概要を見る

In recent years, there have been increased demands for aggregating sensor information from several sensors owing to the spread of the Internet of Things (IoT). However, packet communication, which is a conventional multiple-access technology, is hindered by packet collisions owing to simultaneous access by sensors and waiting time to avoid packet collisions; this increases the aggregation time. The physical wireless parameter conversion sensor network (PhyC-SN) method, which transmits sensor information corresponding to the carrier wave frequency, facilitates the bulk collection of sensor information, thereby reducing the communication time and achieving a high aggregation success rate. However, when more than one sensor transmits the same frequency simultaneously, the estimation accuracy of the number of accessed sensors deteriorates significantly because of multipath fading. Thus, this study focuses on the phase fluctuation of the received signal caused by the frequency offset inherent to the sensor terminals. Consequently, a new feature for detecting collisions is proposed, which is a case in which two or more sensors transmit simultaneously. Furthermore, a method to identify the existence of 0, 1, 2, or more sensors is established. In addition, we demonstrate the effectiveness of PhyC-SNs in estimating the location of radio transmission sources by utilizing three patterns of 0, 1, and 2 or more transmitting sensors.

• Access to Document (DOI)

Resource Allocation for Periodic Traffic in Wireless Sensor Network

Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Mai Ohta, Takeo Fujii

IEEE WCNC International Workshop on Smart Spectrum (IWSS 2023) 2023年03月

研究論文（国際会議プロシーディングス）, 査読有り

Position Estimation of Radio Source Based on Fingerprinting With Physical Wireless Parameter Conversion Sensor Networks

Masafumi Oda, Osamu Takyu, Mai Ohta, Takeo Fujii, and Koichi Adachi

IEEE Access （IEEE）  11   12843 - 12857 2023年02月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Aiming in Harsh Environments: A New Framework for Flexible and Adaptive Resource Management

Jiaqi Zou, Rui Liu, Chenwei Wang, Yuanhao Cui, Zixuan Zou, Songlin Sun, Koichi Adachi

IEEE Network （IEEE）  36 （ 4 ） 70 - 77 2022年10月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Simple Clock Drift Estimation & Compensation for Packet-Level Index Modulation and its Implementation in LoRaWAN

Kohei Tsurumi, Aoto Kaburaki, Koichi Adachi, Osamu Takyu, Takeo Fujii

IEEE Internet of Things Journal （IEEE）  9 （ 16 ） 15089 - 15099 2022年08月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

High-Sensitivity Detection Method for Signals in PhyC-SN

Toshi Ito, Osamu Takyu, Mai Ohta, Takeo Fujii, Koichi Adachi

ICUFN 2022 2022年07月

研究論文（国際会議プロシーディングス）, 査読有り

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 2022年07月

研究論文（国際会議プロシーディングス）, 査読有り

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 （{MDPI} {AG}）  22 （ 11 ） 4140 2022年05月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Flexible Index Mapping Scheme for Packet-Level Index Modulation

Kosuke Suzuki, Koichi Adachi, Mai Ohta, Osamu Takyu, Takeo Fujii

IEEE Wireless Communications Letters （IEEE）  11 （ 4 ） 703 - 706 2022年04月

研究論文（学術雑誌）, 査読有り,  ISSN  2162-2337

　概要を見る

Long range wide area network (LoRaWAN) attracts attention due to its ability to realize massive machine-type communication (MTC); however, the throughput is low due to its narrow-band transmission and chirp spread spectrum. Packet-level index modulation (PLIM) increases the throughput by utilizing a data packet’s frequency channel and transmission timing as an information-bearing index. This letter proposes a flexible index mapping scheme to fully utilize the available frequency channels and transmission timings to increase the number of bits transmitted by an index and avoid packet collision. Numerical results show that the proposed scheme improves the throughput and significantly reduces the required memory size of end nodes.

• Access to Document (DOI)

Estimation Accuracy to Channel Occupancy Ratio and Signal Power under Co-Channel Interference in LoRa

Gaku Kobayashi, Osamu Takyu, Koichi Adachi, Mai Ohta, Takeo Fujii

2021 Int. Conf. on Emerging Technologies for Commun. (ICETC2021)    1 - 1 2021年12月

研究論文（国際会議プロシーディングス）, 査読有り

Achievable Rate Enhancement based on Multi-packet Indexing in Packet-Level Index Modulation

Riku Yamabe, Mikihiko Nishiara, Osamu Takyu, Koichi Adachi

IEEE Access （IEEE）  9   154938 - 154946 2021年11月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Channel Allocation for LoRaWAN Considering Intra-System and Inter-System Interferences

S. Kakuda, Y. Yamazaki, K. Katagiri, T. Fujii, O. Takyu, M. Ohta, K. Adachi

The 2021 IEEE 94th Vehicular Technology Conference (VTC'21-fall)    1 - 5 2021年09月

研究論文（国際会議プロシーディングス）, 査読有り

Proposal of Interference Power Occupancy Estimation Method Using Chirp Demodulation

G. Kobayashi, O. Takyu, K. Adachi, M. Ohta, T. Fujii

The 12th International Conference on Ubiquitous and Future Networks (ICUFN 2021)    1 - 5 2021年08月

研究論文（国際会議プロシーディングス）, 査読有り

Autonomous Decentralized Traffic Control Using Q-learning in LPWAN

A. Kaburaki, K. Adachi, O. Takyu, M. Ohta, T. Fujii

IEEE Access （IEEE）  9   93651 - 93661 2021年06月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Image-Driven Spatial Interpolation with Deep Learning for Radio Map Construction,

K. Suto, S. Bannai, K. Sato, K. Inage, K. Adachi, T. Fujii

IEEE Wireless Commun. Lett. （Institute of Electrical and Electronics Engineers ({IEEE})）  10 （ 6 ） 1222 - 1226 2021年06月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Transmission Timing Control Using ACK Signal in LoRaWAN

M. Chen, K. Adachi, O. Takyu, M. Ohta, T. Fujii

IEEE Wireless Communications and Networking Conference (WCNC'21)    1 - 6 2021年04月

研究論文（国際会議プロシーディングス）, 査読有り

Array Antenna Equipped UAV-BS for Efficient Low Power WSN and Its Theoretical Analysis

Hendrik Lumbantoruan, Koichi Adachi

IET Commun. （Institution of Engineering and Technology ({IET})）  15 （ 16 ） 1 - 14 2021年04月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

DCT Compression Scheme for Wireless Sensor Information Considering Spatial Correlation

K. Natsume, M. Ohta, K. Adachi, O. Takyu, T. Fujii

Int. Conf. on Information Netw. (ICOIN 2021)    1 - 6 2021年01月

研究論文（国際会議プロシーディングス）, 査読有り

Space-Frequency-Interpolated Radio Map

K. Sato, K. Suto, K. Inage, K. Adachi, T. Fujii

IEEE Trans. Veh. Technol. （Institute of Electrical and Electronics Engineers ({IEEE})）  70 （ 1 ） 714 - 725 2021年01月

研究論文（国際会議プロシーディングス）, 査読有り

• Access to Document (DOI)

Packet-Level Index Modulation for LoRaWAN

K. Adachi, K. Tsurumi, A. Kaburaki, O. Takyu, M. Ohta, T. Fujii

IEEE Access （Institute of Electrical and Electronics Engineers ({IEEE})）  9   12601 - 12610 2021年01月

研究論文（学術雑誌）, 査読有り

• Access to Document (DOI)

Generalized Interference Detection Scheme in Heterogeneous Low Power Wide Area Networks

Naoki Aihara, Koichi Adachi, Mai Ohta, Osamu Takyu, and Takeo Fujii

IEEE Sensors Lett. （Institute of Electrical and Electronics Engineers ({IEEE})）  4 （ 6 ） 1 - 4 2020年05月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Q-Learning Aided Resource Allocation and Environment Recognition in LoRaWAN With CSMA/CA

Naoki Aihara, Koichi Adachi, Osamu Takyu, Mai Ohta, and Takeo Fujii

IEEE Access （Institute of Electrical and Electronics Engineers ({IEEE})）  7   152126 - 152137 2019年10月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Radio and Computing Resource Allocation for Minimizing Total Processing Completion Time in Mobile Edge Computing

Ryuji Kobayashi and Koichi Adachi

IEEE Access （Institute of Electrical and Electronics Engineers ({IEEE})）  7   141119 - 141132 2019年09月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Network coding based payload concatenation for relay-assisted V2V communications

Le Tien Trien, Koichi Adachi, Yasushi Yamao

IEICE Communications Express 7 （ 4 ） 148 - 153 2018年04月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Packet relay-assisted V2V communication with sectorised relay station employing payload combining scheme

Le Tien Trien, Koichi Adachi, Yasushi Yamao

IET Commun. 12 （ 4 ） 458 - 465 2018年02月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Efficient CSMA/CA Packet Relay-Assisted Scheme with Payload Combining for ITS V2V Communication

Le Tien Trien, Koichi Adachi, Yasushi Yamao

J. of Information Processing 26   11 - 19 2018年01月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

A Distributed Resource Reservation Scheme for Handover Failure Reduction

Koichi Adachi, Jingon Joung, Yuan Zhou, and Sumei Sun

IEEE Wireless Commun. Lett. （Institute of Electrical and Electronics Engineers ({IEEE})）  4 （ 5 ） 537 - 540 2015年07月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

A Survey on Power-Amplifier-Centric Techniques for Spectrum- and Energy-Efficient Wireless Communications

Jingon Joung, Chin Keong Ho, Koichi Adachi, and Sumei Sun

IEEE Commun. Surveys & Tut. （Institute of Electrical and Electronics Engineers ({IEEE})）  17 （ 1 ） 315 - 333 2014年08月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Adaptive Coordinated Napping (CoNap) for Energy Saving in Wireless Networks

Koichi Adachi, Jingon Joung, Sumei Sun, and Peng Hui Tan

IEEE Transactions on Wireless Communications （Institute of Electrical and Electronics Engineers ({IEEE})）  12 （ 11 ） 5656 - 5667 2013年10月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Recursive QR packet combining for uplink single-carrier multi-user MIMO HARQ using near ML detection

Tetsuya Yamamoto, Koichi Adachi, Sumei Sun, and Fumiyuki Adachi

Wireless Commun. & Mobile Computing 12 （ 18 ） 1652 - 1663 2012年10月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Joint Cooperative-Transmit and Receive FDE for Single-Carrier Incremental Relaying

Koichi Adachi, Kazuki Takeda, Sumei Sun, and Fumiyuki Adachi

IEEE Trans. Veh. Technol. （Institute of Electrical and Electronics Engineers ({IEEE})）  62 （ 1 ） 1 - 13 2012年09月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Power Minimization of Cooperative Relay Transmission with Relay's Private Information

Koichi Adachi, Sumei Sun, and Chin Keong Ho

IEEE Transactions on Wireless Communications （Institute of Electrical and Electronics Engineers ({IEEE})）  11 （ 7 ） 2520 - 2530 2012年05月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Subcarrier Mapping for Single-User SC-FDMA Relay Communications

Yu Hemmi, Koichi Adachi, and Tomoaki Ohtsuki

IEICE Trans. Fundamentals E94-A （ 12 ） 2776 - 2779 2011年12月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

An Autonomous Selective Cooperative ARQ Protocol for Hybrid Mobile Wireless Sensor Networks

NandarLynn, Osamu Takyu, Koichi Adachi, Tomoaki Ohtsuki, and Masao Nakagawa

J. of Commun. 6 （ 2 ） 157 - 167 2011年01月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication

Takeo Yamasaki, Osamu Takyu, Koichi Adachi, Yohtaro Umeda, and Masao Nakagawa

IEICE Trans. Fundamentals E93-A （ 12 ） 2672 - 2681 2010年12月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

On the Construction of Orthogonal Spreading Code Groups for MC-CDMA with FDE in a Frequency Selective Channel

Koichi Adachi and Masao Nakagawa

IEICE Trans. Commun. E93-B （ 3 ） 650 - 659 2010年03月

研究論文（学術雑誌）, 共著, 査読有り

• Access to Document (DOI)

Channel Capacity of MC-CDMA and Impact of Residual ICI

Koichi Adachi, Fumiyuki Adachi, and Masao Nakagawa

IEICE Trans. Commun. E92-B （ 1 ） 209 - 218 2009年01月

研究論文（学術雑誌）, 共著, 査読有り

On Cellular MIMO Channel Capacity

Koichi Adachi, Fumiyuki Adachi, and Masao Nakagawa

IEICE Trans. Commun. E91-B （ 7 ） 2366 - 2373 2008年07月

研究論文（学術雑誌）, 共著, 査読有り

Relay Method of Sending Soft Decision Symbol Based on the Result of Error Detecting Code in Cooperative Communication

Yuki Fukuyama, Osamu Takyu, Koichi Adachi, and Masao Nakagawa

IEICE Trans. Fundamentals E90-A （ 11 ） 2404 - 2412 2007年11月

研究論文（学術雑誌）, 共著, 査読有り

Theoretical Analysis of Decision Directed Block Iterative Channel Estimation for OFDM Mobile Radio,

Koichi Adachi and Masao Nakagawa

IEICE Trans. Commun. E90-B （ 7 ） 1764 - 1772 2007年07月

研究論文（学術雑誌）, 共著, 査読有り

Iterative Modified QRD-M Based on CRC Codes for OFDM MIMO Multiplexing

Koichi Adachi and Masao Nakagawa

IEICE Trans. Commun. E90-B （ 6 ） 1433 - 1443 2007年06月

研究論文（学術雑誌）, 共著, 査読有り

Iterative QRM-MLD with Pilot Assisted Decision Directed Channel Estimation for OFDM MIMO Multiplexing

Koichi Adachi, Riaz Esmailzadeh, and Masao Nakagawa

IEICE Trans. Fundamentals E89-A （ 7 ） 1892 - 1902 2006年07月

研究論文（学術雑誌）, 共著, 査読有り