IEICE Trans

Hiraku OKADA

Voronoi-Based UAV Flight Method for Non-Uniform User Distribution in Delay-Tolerant Aerial Networks Hiroyuki ASANO Hiraku OKADA Chedlia BEN NAILA Masaaki KATAYAMA
Publication: Publication Date: 2022/11/01 Vol. E105-B No. 11 pp. 1414-1423 Type of Manuscript: PAPER Category: Network Keyword: unmanned aerial vehicle (UAV), delay-tolerant networking (DTN), delay, Voronoi, user distribution,
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An Overview of Aerial Wireless Relay Networks for Emergency Communications during Large-Scale Disasters Hiraku OKADA
Publication: Publication Date: 2020/12/01 Vol. E103-B No. 12 pp. 1376-1384 Type of Manuscript: INVITED PAPER (Special Section on IoT Sensor Networks and Mobile Intelligence) Category: Keyword: aerial wireless relay networks, multicopter UAV, delay time, flight schemes,
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FOREWORD Hiraku OKADA
Publication: Publication Date: 2019/04/01 Vol. E102-B No. 4 pp. 659-659 Type of Manuscript: FOREWORD Category: Keyword:
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Simplified Vehicle Vibration Modeling for Image Sensor Communication Masayuki KINOSHITA Takaya YAMAZATO Hiraku OKADA Toshiaki FUJII Shintaro ARAI Tomohiro YENDO Koji KAMAKURA
Publication: Publication Date: 2018/01/01 Vol. E101-A No. 1 pp. 176-184 Type of Manuscript: Special Section PAPER (Special Section on Wideband Systems) Category: Keyword: visible light communication, image sensor communication, vehicle vibration, road surface irregularity, transmitter displacement, vehicle motion model,
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Link Quality Information Sharing by Compressed Sensing and Compressed Transmission for Arbitrary Topology Wireless Mesh Networks Hiraku OKADA Shuhei SUZAKI Tatsuya KATO Kentaro KOBAYASHI Masaaki KATAYAMA
Publication: Publication Date: 2017/03/01 Vol. E100-B No. 3 pp. 456-464 Type of Manuscript: PAPER Category: Terrestrial Wireless Communication/Broadcasting Technologies Keyword: wireless mesh network, link quality, information sharing, compressed sensing, diffusion wavelets,
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H-Infinity Control Design Considering Packet Loss as a Disturbance for Networked Control Systems Takashi OGURA Kentaro KOBAYASHI Hiraku OKADA Masaaki KATAYAMA
Publication: Publication Date: 2017/02/01 Vol. E100-A No. 2 pp. 353-360 Type of Manuscript: Special Section PAPER (Special Section on Reliable Communication and Control) Category: Keyword: networked control, packet loss, control design, robust control, H-infinity control, LQ control,
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Predictive Control for Performance Improvement of a Feedback Control System Using Cyclostationary Channels Cesar CARRIZO Kentaro KOBAYASHI Hiraku OKADA Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2015/04/01 Vol. E98-A No. 4 pp. 1000-1005 Type of Manuscript: PAPER Category: Communication Theory and Signals Keyword: power line communications (PLC), feedback control, cyclostationary channel, rotary inverted pendulum, predictive control,
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Mutual Information Evaluation and Optimization of Intermittent Transmission Methods in Energy Harvesting Wireless Sensor Networks Xiaohui FAN Hiraku OKADA Kentaro KOBAYASHI Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2014/09/01 Vol. E97-B No. 9 pp. 1826-1834 Type of Manuscript: Special Section PAPER (Special Section on Ambient Intelligence and Sensor Networks) Category: Keyword: mutual information, temporal correlation, spatial correlation, energy harvesting, wireless sensor network,
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Spectrum Sharing Overlay System with a Repeater for the Primary Signal Jun NAGANAWA Kentaro KOBAYASHI Hiraku OKADA Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2014/07/01 Vol. E97-A No. 7 pp. 1576-1586 Type of Manuscript: PAPER Category: Communication Theory and Signals Keyword: cognitive radio, spectrum sharing, overlay, regenerative repeater, QAM,
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Impact of the Reduction of Transmitted Information on the Control Quality in a Wireless Feedback Control System Ryota MIZUTANI Kentaro KOBAYASHI Hiraku OKADA Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2013/05/01 Vol. E96-A No. 5 pp. 869-877 Type of Manuscript: Special Section PAPER (Special Section on Networked Control Systems: Theories & Applications) Category: Keyword: wireless control, reliable radio, feedback control, reduction of transmitted information, rotary inverted pendulum,
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Control Quality of a Feedback Control System under Cyclostationary Noise in Power Line Communication Cesar CARRIZO Kentaro KOBAYASHI Hiraku OKADA Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2012/04/01 Vol. E95-A No. 4 pp. 706-712 Type of Manuscript: Special Section PAPER (Special Section on Reliable Robust Radio Control Technology) Category: Keyword: power line communications (PLC), machine control through power lines, cyclostationary noise, rotary inverted pendulum, feedback control,
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Experimental Results on Simple Distributed Cooperative Transmission Scheme with Visible Light Communication Takaya YAMAZATO Koji NAKAO Hiraku OKADA Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2010/11/01 Vol. E93-B No. 11 pp. 2959-2962 Type of Manuscript: Special Section LETTER (Special Section on Fundamental Issues on Deployment of Ubiquitous Sensor Networks) Category: Keyword: wireless sensor networks, distributed cooperative transmission, turbo coded FSK, random phase multiplication, visible light communication,
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Error Correction Using Time-Dependent Correlation and Transmit Power Control in Sensor Networks Suguru DOKI Hiraku OKADA Kenichi MASE
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2008/11/01 Vol. E91-B No. 11 pp. 3426-3433 Type of Manuscript: Special Section PAPER (Special Section on Emerging Technologies for Practical Ubiquitous and Sensor Networks) Category: Keyword: sensor network, time-dependent correlation, turbo code, transmission power control,
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Analysis and Proposal of Position-Based Routing Protocols for Vehicular Ad Hoc Networks Hiraku OKADA Akira TAKANO Kenichi MASE
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2008/07/01 Vol. E91-A No. 7 pp. 1634-1641 Type of Manuscript: Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks) Category: Keyword: VANET, position-based routing, next-hop forwarding method, directed flooding method,
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Performance Analysis of Source-Destination ARQ Scheme for Multiroute Coding in Wireless Multihop Networks Hiraku OKADA Masato SAITO Tadahiro WADA Kouji OHUCHI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2007/08/01 Vol. E90-B No. 8 pp. 2111-2119 Type of Manuscript: PAPER Category: Terrestrial Radio Communications Keyword: wireless multihop network, multiple routes, ARQ, error correcting,
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Influence of ADC Nonlinearity on the Performance of an OFDM Receiver Manabu SAWADA Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2006/12/01 Vol. E89-B No. 12 pp. 3250-3256 Type of Manuscript: Special Section PAPER (Special Section on Software Defined Radio Technology and Its Applications) Category: Keyword: OFDM, ADC, nonlinearity, quantization error, clipping,
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MIMO Zero-Forcing Equalizer for BFDM/OQAM Systems in Time-Frequency Dispersive Channels Bayarpurev MONGOL Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2006/11/01 Vol. E89-A No. 11 pp. 3114-3122 Type of Manuscript: Special Section PAPER (Special Section on Wide Band Systems) Category: Keyword: pulse-shaping OFDM, BFDM/OQAM, ISI/ICI, MIMO zero-forcing equalizer,
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Multi-Route Coding in Wireless Multi-Hop Networks Hiraku OKADA Nobuyuki NAKAGAWA Tadahiro WADA Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2006/05/01 Vol. E89-B No. 5 pp. 1620-1626 Type of Manuscript: PAPER Category: Terrestrial Radio Communications Keyword: multi-route coding, turbo code, multipath dynamic source routing, wireless multi-hop network,
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Outage Probability of a Macro and Micro MIMO Diversity Scheme in an Indoor Fading and Shadowing Environment Ryosuke UCHIDA Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2005/10/01 Vol. E88-A No. 10 pp. 2945-2951 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: MIMO System Keyword: MIMO, STBC, wireless control, industrial equipment,
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Application of Successive Interference Cancellation to a Packet-Recognition/Code-Acquisition Scheme in CDMA Unslotted ALOHA Systems Yukihiro TADOKORO Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2005/06/01 Vol. E88-A No. 6 pp. 1605-1612 Type of Manuscript: PAPER Category: Communication Theory and Signals Keyword: CDMA Unslotted ALOHA, successive interference cancellation, throughput, packet recognition, code acquisition,
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An Adaptive Receiver for Power-Line Communications with the Estimation of Instantaneous Noise Power Yuichi HIRAYAMA Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2005/03/01 Vol. E88-A No. 3 pp. 755-760 Type of Manuscript: PAPER Category: Spread Spectrum Technologies and Applications Keyword: non-stationary noise, noise power estimation, MAP and adaptive receiver,
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Hierarchical Transmission of DCT Coefficients Using Multi-Code DS/SS Modulation Masaru HONJO Satoshi MAKIDO Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2004/11/01 Vol. E87-A No. 11 pp. 3001-3007 Type of Manuscript: PAPER Category: Communication Theory and Signals Keyword: DCT, multi-code SS, hierarchical transmission,
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Performance Improvement for Coded OFDM Systems with Adaptive Interleaving in Frequency Selective Fading Channel Masaaki HARADA Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2003/06/01 Vol. E86-A No. 6 pp. 1541-1549 Type of Manuscript: PAPER Category: Coding Theory Keyword: OFDM, adaptive interleave, bit interleave, symbol interleave, MTCM, convolutional code, trellis diagram, frequency selective fading, Euclidean distance,
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A Study on Turbo Soft-Decision Decoding for Hard-Detected Optical Communication Signals Chen ZHENG Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2003/03/01 Vol. E86-B No. 3 pp. 1022-1030 Type of Manuscript: PAPER Category: Fiber-Optic Transmission Keyword: turbo decoding, error-detected reliability, error-detected state, optical fiber communication,
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Soft-Decision Decoding of Low-Density Parity-Check Codes for Hard-Detected Optical Communication Signals Chen ZHENG Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2003/03/01 Vol. E86-B No. 3 pp. 1132-1135 Type of Manuscript: LETTER Category: Fundamental Theories Keyword: low-density parity-check codes, optical fiber communication, error detection, hard-detected signal,
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Comparison of Multiple Access Schemes in Multibeam Non-GEO Satellite Communication Systems Naoki ICHIKAWA Masaaki KATAYAMA Hiraku OKADA Takaya YAMAZATO Akira OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2003/02/01 Vol. E86-B No. 2 pp. 785-791 Type of Manuscript: PAPER Category: Satellite and Space Communications Keyword: multibeam satellite, multiple access, capacity, interference,
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Performance Improvement of OFDM System with Consideration on the Characteristics of Power-Line Noise Kazutoshi SUGIMOTO Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2002/12/01 Vol. E85-A No. 12 pp. 2822-2829 Type of Manuscript: Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications) Category: Keyword: power-line communication, OFDM, cyclo-stationary Gaussian noise, repetition code,
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Medium Access Control Protocol Based on Estimation of Multimedia Traffic with an Adaptive Algorithm in CDMA Packet Communications Yasuhiro HIRAYAMA Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2002/12/01 Vol. E85-A No. 12 pp. 2868-2876 Type of Manuscript: Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications) Category: Keyword: CDMA packet communications, multimedia traffic, medium access control, adaptive algorithm,
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New Analytical Model for TCP in Wireless Environments Katsuhiro NAITO Hiraku OKADA Masato SAITO Takaya YAMAZATO Masaaki KATAYAMA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2002/07/01 Vol. E85-A No. 7 pp. 1501-1510 Type of Manuscript: Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks) Category: Keyword: TCP, Markov chain, throughput, wireless,
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BER Analysis for Multi-Carrier DS CDMA with Multi-Rate Traffic Abbas SANDOUK Masaaki HARADA Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2001/07/01 Vol. E84-A No. 7 pp. 1723-1731 Type of Manuscript: Special Section LETTER (Special Section on Multi-dimensional Mobile Information Networks) Category: Keyword: multi-rate traffic, BER analysis, multi-carrier DS-CDMA, OFDM-CDMA,
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Generation of Sets of Sequences Suitable for Multicode Transmission in Quasi-Synchronous CDMA Systems Masato SAITO Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2001/03/01 Vol. E84-B No. 3 pp. 576-580 Type of Manuscript: Special Section LETTER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21^st Century) Category: Keyword: quasi-synchronous CDMA, Gold code, orthogonal Gold code, multicode transmission,
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Queueing Analysis of CDMA Unslotted ALOHA Systems with Finite Buffers Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1998/10/25 Vol. E81-A No. 10 pp. 2083-2091 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Spread Spectrum System Keyword: CDMA unslotted ALOHA, finite buffer capacity, packet queueing, Markov chain,
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CDMA Slotted ALOHA System with Finite Buffers Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1998/07/25 Vol. E81-A No. 7 pp. 1473-1478 Type of Manuscript: Special Section LETTER (Special Section on Fundamentals of Multi-dimensional Mobile Information Network) Category: Keyword: CDMA slotted ALOHA, finite buffer capacity, finite population, throughput, average delay, rejection probability,
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Throughput Improvement of CDMA Slotted ALOHA Systems Masato SAITO Hiraku OKADA Takeshi SATO Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 1997/01/25 Vol. E80-B No. 1 pp. 74-80 Type of Manuscript: Special Section PAPER (Special Issue on Advances in Satellite Communications toward Multimedia Era) Category: Protocol Keyword: CDMA slotted ALOHA systems, QS-sequences, access timing error, modified channel load sensing protocol, access timing delay,
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CDMA ALOHA Systems with Modified Channel Load Sensing Protocol for Satellite Communications Hiraku OKADA Masato SAITO Takeshi SATO Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1996/12/25 Vol. E79-A No. 12 pp. 2035-2042 Type of Manuscript: Special Section PAPER (Special Secton on Spread Spectrum Techniques and Applications) Category: Keyword: CDMA ALOHA, throughput, access control, access timing delay,
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Effects of the Access Timing Delay on CDMA Unslotted ALOHA with Channel Load Sensing Takeshi SATO Hiraku OKADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 1996/09/25 Vol. E79-B No. 9 pp. 1339-1345 Type of Manuscript: Special Section PAPER (Special Issue on Personal Communications) Category: CDMA and multiple access technologies Keyword: CDMA ALOHA, CLSP, access timing delay,
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CDMA Unslotted ALOHA Systems with Packet Retransmission Control Hiraku OKADA Takeshi SATO Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1996/07/25 Vol. E79-A No. 7 pp. 1004-1010 Type of Manuscript: Special Section PAPER (Special Section on Multi-dimensional Mobile Informatin Network) Category: Keyword: CDMA unslotted ALOHA, throughput, delay, system stability, retransmission control,
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