Hiraku OKADA


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 networklink qualityinformation sharingcompressed sensingdiffusion wavelets
 Summary | Full Text:PDF(1.5MB)

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 controlpacket losscontrol designrobust controlH-infinity controlLQ control
 Summary | Full Text:PDF(1.1MB)

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 controlcyclostationary channelrotary inverted pendulumpredictive control
 Summary | Full Text:PDF(1.3MB)

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 informationtemporal correlationspatial correlationenergy harvestingwireless sensor network
 Summary | Full Text:PDF(2.1MB)

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 radiospectrum sharingoverlayregenerative repeaterQAM
 Summary | Full Text:PDF(1.9MB)

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 controlreliable radiofeedback controlreduction of transmitted informationrotary inverted pendulum
 Summary | Full Text:PDF(1.7MB)

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 linescyclostationary noiserotary inverted pendulumfeedback control
 Summary | Full Text:PDF(1.3MB)

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 networksdistributed cooperative transmissionturbo coded FSKrandom phase multiplicationvisible light communication
 Summary | Full Text:PDF(971.8KB)

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 networktime-dependent correlationturbo codetransmission power control
 Summary | Full Text:PDF(416KB)

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: 
VANETposition-based routingnext-hop forwarding methoddirected flooding method
 Summary | Full Text:PDF(787KB)

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 networkmultiple routesARQerror correcting
 Summary | Full Text:PDF(546.5KB)

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: 
OFDMADCnonlinearityquantization errorclipping
 Summary | Full Text:PDF(1.3MB)

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 OFDMBFDM/OQAMISI/ICIMIMO zero-forcing equalizer
 Summary | Full Text:PDF(542.9KB)

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 codingturbo codemultipath dynamic source routingwireless multi-hop network
 Summary | Full Text:PDF(444.9KB)

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: 
MIMOSTBCwireless controlindustrial equipment
 Summary | Full Text:PDF(343.8KB)

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 ALOHAsuccessive interference cancellationthroughputpacket recognitioncode acquisition
 Summary | Full Text:PDF(719KB)

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 noisenoise power estimationMAP and adaptive receiver
 Summary | Full Text:PDF(623.4KB)

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: 
DCTmulti-code SShierarchical transmission
 Summary | Full Text:PDF(480.3KB)

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: 
OFDMadaptive interleavebit interleavesymbol interleaveMTCMconvolutional codetrellis diagramfrequency selective fadingEuclidean distance
 Summary | Full Text:PDF(529.3KB)

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 codesoptical fiber communicationerror detectionhard-detected signal
 Summary | Full Text:PDF(245.3KB)

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 decodingerror-detected reliabilityerror-detected stateoptical fiber communication
 Summary | Full Text:PDF(461.1KB)

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 satellitemultiple accesscapacityinterference
 Summary | Full Text:PDF(477.7KB)

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 communicationOFDMcyclo-stationary Gaussian noiserepetition code
 Summary | Full Text:PDF(1.2MB)

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 communicationsmultimedia trafficmedium access controladaptive algorithm
 Summary | Full Text:PDF(781.5KB)

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: 
TCPMarkov chainthroughputwireless
 Summary | Full Text:PDF(422.3KB)

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 trafficBER analysismulti-carrier DS-CDMAOFDM-CDMA
 Summary | Full Text:PDF(627.3KB)

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 21st Century)
Category: 
Keyword: 
quasi-synchronous CDMAGold codeorthogonal Gold codemulticode transmission
 Summary | Full Text:PDF(166.9KB)

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 ALOHAfinite buffer capacitypacket queueingMarkov chain
 Summary | Full Text:PDF(703.6KB)

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 ALOHAfinite buffer capacityfinite populationthroughputaverage delayrejection probability
 Summary | Full Text:PDF(459.4KB)

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 systemsQS-sequencesaccess timing errormodified channel load sensing protocolaccess timing delay
 Summary | Full Text:PDF(619.4KB)

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 ALOHAthroughputaccess controlaccess timing delay
 Summary | Full Text:PDF(707.6KB)

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 ALOHACLSPaccess timing delay
 Summary | Full Text:PDF(552.7KB)

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 ALOHAthroughputdelaysystem stabilityretransmission control
 Summary | Full Text:PDF(649.7KB)