Akira OGAWA


FOREWORD
Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/10/01
Vol. E88-A  No. 10  pp. 2707-2707
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(43.6KB)

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)

Information and Signal Processing for Sensor Networks
Akira OGAWA Takaya YAMAZATO Tomoaki OHTSUKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/10/01
Vol. E87-A  No. 10  pp. 2599-2606
Type of Manuscript:  INVITED PAPER (Special Section on Wide Band Systems)
Category: 
Keyword: 
sensor networkscollaborative information and signal processingjoint source and channel codingdeterministic and statistic collaborationcooperative diversity
 Summary | Full Text:PDF(316.8KB)

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)

A Symbol Synchronizer for Multi-Carrier Spread-Spectrum Systems
Shigetaka GOTO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/12/01
Vol. E85-A  No. 12  pp. 2881-2885
Type of Manuscript:  Special Section LETTER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
multi-carrier spread-spectrumsymbol synchronizerpacket transmissionfalse-detectionmiss-detection
 Summary | Full Text:PDF(494.4KB)

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)

QoS and Capacity Comparison of CDMA ALOHA Protocols in Multimedia Networks
Abbas SANDOUK Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/06/01
Vol. E84-B  No. 6  pp. 1588-1595
Type of Manuscript:  Special Section LETTER (Special Issue on New Developments on QoS Technologies for Information Networks)
Category: 
Keyword: 
CDMA ALOHApacket CDMAthroughput analysisoutage probabilityvoice and data transmission
 Summary | Full Text:PDF(520.3KB)

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)

Joint Multi-Dimensional Channel Parameter Estimation Schemes for DS-CDMA Systems Using a Modified Version of the SAGE Algorithm
Youssef R. SENHAJI Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 511-519
Type of Manuscript:  Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21st Century)
Category: 
Keyword: 
channel parameter estimationEM algorithmSAGE algorithmCramer-Rao lower boundmaximum-likelihood estimation
 Summary | Full Text:PDF(499.1KB)

Throughput Performance of CDMA Slotted ALOHA Systems Based on Average Packet Success Probability Considering Bit-to-Bit Dependence
Masato SAITO Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/02/01
Vol. E84-A  No. 2  pp. 653-659
Type of Manuscript:  PAPER
Category: Spread Spectrum Technologies and Applications
Keyword: 
CDMA Slotted ALOHApacket success probabilitybit-to-bit dependencethroughput
 Summary | Full Text:PDF(740.8KB)

An Initial Code Acquisition Scheme for Indoor Packet DS/SS Systems with Macro/Micro Antenna Diversity
Youhei IKAI Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/11/25
Vol. E83-A  No. 11  pp. 2070-2077
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
spread spectrumcode acquisitionindoor packet radiospatial diversityfading and shadowing
 Summary | Full Text:PDF(820.6KB)

FOREWORD
Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/11/25
Vol. E83-A  No. 11  pp. 2047-2047
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(91.1KB)

An Access Control Protocol for a Heterogeneous Traffic with a Multi-Code CDMA Scheme
Abbas SANDOUK Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/11/25
Vol. E83-A  No. 11  pp. 2085-2092
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
access controlintegrated voice and datapacket CDMAmulti-code CDMAthroughput and delay analysis
 Summary | Full Text:PDF(965.8KB)

A Study on Reducing the Nonlinear Distortion in Multicarrier Systems
Masaaki HARADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/10/25
Vol. E83-A  No. 10  pp. 1992-1995
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Multicarrier System
Keyword: 
multicarrier signalsignal point seriesPMEPRMLSDsquared distance
 Summary | Full Text:PDF(281.5KB)

Joint Optimization of Transmitter/Receiver with Multiple Transmit/Receive Antennas in Band-Limited Channels
Koichiro BAN Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/08/25
Vol. E83-B  No. 8  pp. 1697-1704
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
joint optimizationmultiple antennasbit allocationdiversity
 Summary | Full Text:PDF(765.4KB)

Adaptive Transmit Permission Probability Control in CDMA Cellular Packet Communications with Site Diversity
Kazuo MORI Takehiko KOBAYASHI Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/07/25
Vol. E83-B  No. 7  pp. 1445-1453
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
fairnessCDMApacket communicationtransmit permission probabilityadaptive control
 Summary | Full Text:PDF(972.3KB)

Optimum Cell Boundary for Uplink and Downlink in CDMA Systems
Kohji TAKEO Shinichi SATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/04/25
Vol. E83-B  No. 4  pp. 865-868
Type of Manuscript:  LETTER
Category: Terrestrial Radio Communications
Keyword: 
CDMA systemup/downlinknon-uniform trafficcell structure
 Summary | Full Text:PDF(346.9KB)

Effects of Cell Structure on Quality of Service of LEOS Communication Systems
Kenichi ONO Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/04/25
Vol. E83-B  No. 4  pp. 782-790
Type of Manuscript:  PAPER
Category: Satellite and Space Communications
Keyword: 
LEOS (low earth-orbital satellite)overlap celloverlay cellhandoverQoS (quality of service)
 Summary | Full Text:PDF(1.2MB)

Decorrelating Detector for Multi-Processing Gain CDMA Systems
Hiroyuki HIRAIWA Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2774-2777
Type of Manuscript:  Special Section LETTER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
decorrelating detectorCDMAmulti-processing gainmultiuser detection
 Summary | Full Text:PDF(339.9KB)

Chip-by-Chip Turbo Coding for DS/SS Systems
Chen ZHENG Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2751-2757
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
Turbo-codeschip-by-chip codingDS/SS modulationenergy compensation
 Summary | Full Text:PDF(985.4KB)

Code Acquisition of a DS/SS Signal with Transmit and Receive Antenna Diversity
Youhei IKAI Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2728-2734
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
spread spectrumacquisitionindoor radio transmissiondiversityfading
 Summary | Full Text:PDF(712KB)

Uplink and Downlink Communications Qualities in CDMA Cellular Systems Considering Effects of Traffic Distribution
Kohji TAKEO Shinichi SATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2677-2686
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
CDMA cellular systemtraffic distributioncommunications qualityuplink/downlink
 Summary | Full Text:PDF(1006.5KB)

Adaptive Array Antennas for the Base Station of a Multi Processing Gain CDMA System
Akihito MORIMOTO Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2687-2696
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
adaptive array antennaCDMAdespreading procedureinterference cancellation
 Summary | Full Text:PDF(886.6KB)

Service Fairness in CDMA Cellular Packet Systems with Site Diversity Reception
Kazuo MORI Takehiko KOBAYASHI Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 1964-1973
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
service fairnessCDMApacket communicationslotted-ALOHAtransmission power controlpermission probability control
 Summary | Full Text:PDF(948.3KB)

FOREWORD
Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2615-2615
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(81.7KB)

FOREWORD
Akira OGAWA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/10/25
Vol. E82-A  No. 10  pp. 1997-1997
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(185.4KB)

An Integrated Voice/Data CDMA Packet Communications with Multi-Code CDMA Scheme
Abbas SANDOUK Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/10/25
Vol. E82-A  No. 10  pp. 2105-2114
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communication Systems
Keyword: 
integrated voice and datapacket CDMACDMA ALOHAmulti-code CDMAthroughputoutage probabilityMCLSP
 Summary | Full Text:PDF(937.5KB)

Hierarchical Transmission of Huffman Code Using Multi-Code/Multi-Rate DS/SS Modulation with Appropriate Power Control
Satoshi MAKIDO Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/12/25
Vol. E81-B  No. 12  pp. 2283-2289
Type of Manuscript:  Special Section PAPER (Special Issue on the Latest Development of Telecommunication Research)
Category: Transmission and Modulation
Keyword: 
Huffman codemulti-code SSparallel transmissionhierarchical transmission
 Summary | Full Text:PDF(620.5KB)

Performance Evaluation of DS/CDMA Communications Systems Modulated with π/2-Shift BPSK over Multipath Rayleigh Fading Channels
M. M. Asadullah GALIB Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/11/25
Vol. E81-A  No. 11  pp. 2304-2310
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
π/2-shift BPSKDS/SS/CDMAsoft/hard-limiterout-of-band powerspectral efficiencyRAKE receiver
 Summary | Full Text:PDF(645.1KB)

New Quasi-Synchronous Sequences for CDMA Slotted ALOHA Systems
Masato SAITO Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/11/25
Vol. E81-A  No. 11  pp. 2274-2280
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
CDMA slotted ALOHA systemQS-sequencesaccess timing errororthogonal Gold sequences flat fading channel
 Summary | Full Text:PDF(563.9KB)

Initial Acquisition of Code Timings and Carrier Frequencies of CDM Down-Link Signals in Multiple-LEO-Satellite Communication Systems
Mihoko ISHIZU Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/11/25
Vol. E81-A  No. 11  pp. 2281-2290
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
spread-spectrumDoppler offsetinitial acquisitionCDMFFT
 Summary | Full Text:PDF(804.8KB)

Error Correcting Capability of Constant Amplitude Coding for Orthogonal Multi-Code CDMA Systems
Tadahiro WADA 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. 2166-2169
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
orthogonal multi-code CDMA systemsconstant amplitude codingnonlinear distortionerror correcting capability
 Summary | Full Text:PDF(308.8KB)

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)

A Constant Amplitude Coding for Orthogonal Multi-Code CDMA Systems
Tadahiro WADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/12/25
Vol. E80-A  No. 12  pp. 2477-2484
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
orthogonal multi-code CDMA systemsconstant amplitude codingHadamard code sequencesnon-liner amplifier
 Summary | Full Text:PDF(597.4KB)

Effects of Transmission Control in an Integrated Voice and Data CDMA System
Takeshi SATO Abbas SANDOUK Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/12/25
Vol. E80-A  No. 12  pp. 2509-2516
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
CDMACLSPvoicedata
 Summary | Full Text:PDF(681.2KB)

CDMA for Personal Communications Based on Low Earth-Orbital Satellite Systems
Akira OGAWA Masaaki KATAYAMA Takaya YAMAZATO Abbas JAMALIPOUR 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/12/25
Vol. E80-A  No. 12  pp. 2347-2356
Type of Manuscript:  INVITED PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
CDMAPCSLEOSmultiple accesscode acquisitiontraffic nonuniformityCDMA ALOHA
 Summary | Full Text:PDF(897.4KB)

Multi-Antenna Transmission Scheme for Convolutionally Coded DS/CDMA System
Koichiro BAN Masaaki KATAYAMA Wayne E. STARK Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/12/25
Vol. E80-A  No. 12  pp. 2437-2444
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
multi-antenna transmissionconvolutional codesfadingCDMAdiversity
 Summary | Full Text:PDF(677.5KB)

A Simple Transmit/Receive Antenna Diversity for Indoor DS/CDMA Wireless Communication Systems
Koichiro BAN Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/12/25
Vol. E80-B  No. 12  pp. 1790-1796
Type of Manuscript:  PAPER
Category: Radio Communication
Keyword: 
multi-antenna transmissionflat fadingCDMAdiversity
 Summary | Full Text:PDF(590.4KB)

A Spread-Spectrum System with Dual Processing Gains Designed for Cyclic Noise in Power Line Communications
Hisashi NIWA Osamu OONO Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA Noriyuki ISAKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/12/25
Vol. E80-A  No. 12  pp. 2526-2533
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
power line communicationsspread spectrumcyclic noisedual processing gains
 Summary | Full Text:PDF(672.3KB)

An Initial Acquisition Method for M-Ary Spread-Spectrum Signals Using Hadamard Code Sequences
Tadahiro WADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/11/25
Vol. E80-A  No. 11  pp. 2172-2179
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communications/Coded Modulation/Spread Spectrum
Keyword: 
M-ary/SS communication systeminitial acquisition methodcarrier frequency offsetHadamard code sequences
 Summary | Full Text:PDF(624.7KB)

π/2-shift BPSK A Modulation Scheme Robust to Nonlinear Amplification for CDMA Mobile Communications
Kumud KASHYAP Tadahiro WADA Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/09/25
Vol. E80-A  No. 9  pp. 1634-1639
Type of Manuscript:  Special Section LETTER (Special Section on Nonlinear Theory and its Applications)
Category: 
Keyword: 
π/2-BPSKCDMAspread spectrumnonlinear amplifiercoherent detectiondifferential detection
 Summary | Full Text:PDF(428KB)

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)

DS/SS/GMSK with Differential Detection Over Multipath Reyleigh Fading Channels
Isamu WAKAKI Takayuki ISHIGURO 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. 1957-1962
Type of Manuscript:  Special Section PAPER (Special Secton on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
GMSKCDMAspread spectrumdifferential detectionRAKE
 Summary | Full Text:PDF(580.4KB)

Coordinate Interleaved Trellis Coded QPSK with T-Algorithm on Rayleigh Fading Channel
Hiroki NAKAMURA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/09/25
Vol. E79-B  No. 9  pp. 1248-1255
Type of Manuscript:  Special Section PAPER (Special Issue on Personal Communications)
Category: Modulation, Equalization and interference cancellation technologies
Keyword: 
T-algorithmconvolutional codecoordinate interleavingfading channels
 Summary | Full Text:PDF(610.8KB)

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)

Effects of Multiple Access Interference in a Multi-Rate SSMA System
Motohiro ICHIBA Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/09/25
Vol. E79-B  No. 9  pp. 1333-1338
Type of Manuscript:  Special Section PAPER (Special Issue on Personal Communications)
Category: CDMA and multiple access technologies
Keyword: 
wireless multimedia communication systemsmultirate signalspread spectrumdifferent processing gainscrosscorrelation
 Summary | Full Text:PDF(536.2KB)

A New M-ary Spread-Spectrum Multiple-Access Scheme in the Presence of Carrier Frequency Offset
Tadahiro WADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/09/25
Vol. E79-A  No. 9  pp. 1415-1422
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communication/Spread Spectrum
Keyword: 
M-ary/SSMA communication schemecarrier frequency offsetmultipath-access interferenceHadamard codes
 Summary | Full Text:PDF(688.8KB)

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)

Adaptive Transmit Permission Control on Spread-Slotted Aloha Packets Applicable in LEOS Systems
Abbas JAMALIPOUR Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/03/25
Vol. E79-B  No. 3  pp. 257-265
Type of Manuscript:  Special Section PAPER (Special Issue on Advanced Adaptive Radio Communication Technologies)
Category: Access, Network
Keyword: 
spread spectrumslotted-Alohamobile communicationsadaptive service areainterference reductionthroughput
 Summary | Full Text:PDF(835KB)

Throughput Analysis of Spread-Slotted ALOHA in LEO Satellite Communication Systems with Nonuniform Traffic Distribution
Abbas JAMALIPOUR Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1995/12/25
Vol. E78-B  No. 12  pp. 1657-1665
Type of Manuscript:  PAPER
Category: Satellite Communication
Keyword: 
LEO satellite systemsnonuniform traffic distributionspread-slotted ALOHA packet communicationthroughput analysis
 Summary | Full Text:PDF(719.8KB)

Estimation of the Location of Intracranial Vascular Diseases Using Several Sensors
Satoshi HONGO Masato ABE Yoshiaki NEMOTO Noriyoshi CHUBACHI Yasunari OTAWARA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/12/25
Vol. E78-A  No. 12  pp. 1640-1648
Type of Manuscript:  Special Section PAPER (Special Section on Acoustic Diagnosis)
Category: 
Keyword: 
cranial bruitcross-spectrumnon-invasive measurementaneurysmweighted least squares method
 Summary | Full Text:PDF(676.2KB)

Non-coherent Reception of M-ary Spread-Spectrum Signals in the Presence of Carrier Frequency Offset
Tadahiro WADA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/09/25
Vol. E78-A  No. 9  pp. 1102-1108
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
M-ary spread-spectrum communication systemnon-coherent receptioncarrier frequency offsetHadamard matrix
 Summary | Full Text:PDF(594.2KB)

Performance of Bit-Interleaved Trellis Coded 16-QAM with Maximized Code Diversity
Akio AOYAMA Hitoshi NAKAGAWA Takaya YAMAZATO Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/09/25
Vol. E78-A  No. 9  pp. 1215-1219
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
TCMRayleigh fading channelbit interleaving16QAM
 Summary | Full Text:PDF(353.5KB)

Effect of Nonlinear Amplification on a Spread Spectrum Signal and Receiver Configurations
Manabu SAWADA Masaaki KATAYAMA Takaya YAMAZATO Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1994/11/25
Vol. E77-A  No. 11  pp. 1855-1862
Type of Manuscript:  Special Section PAPER (Special Section on Nonlinear Theory and Its Applications)
Category: Nonlinear Channel
Keyword: 
nonlinear amplificationspread spectrumradio communicationMLSE
 Summary | Full Text:PDF(617.3KB)

Performance of Asynchronous Band-Limited DS/SSMA Systems
Takafumi SHIBATA Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/08/25
Vol. E76-B  No. 8  pp. 921-928
Type of Manuscript:  Special Section PAPER (Special Issue on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
direct-sequence spread-spectrum multiple-accesssignal-to-noise plus interference ratioband-limitationspectral efficiencygold sequence
 Summary | Full Text:PDF(490.5KB)

Effect of Nonlinear Amplifiers of Transmitters in the CDMA System Using Offset-QPSK
Manabu SAWADA Masaaki KATAYAMA Akira OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/07/25
Vol. E76-B  No. 7  pp. 741-744
Type of Manuscript:  Special Section LETTER (Special Section of Letters Selected from the 1992 IEICE Fall Conference and the 1993 IEICE Spring Conference)
Category: 
Keyword: 
radio communicationnonlinear amplifierCDMAoffset-QPSK
 Summary | Full Text:PDF(262.3KB)

Bit Error Rate Performance of Soft Decision Viterbi Decoding
Yutaka YASUDA Yasuo HIRATA Akira OGAWA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1981/11/25
Vol. E64-E  No. 11  pp. 700-707
Type of Manuscript:  PAPER
Category: Transmission Systems
Keyword: 
 Summary | Full Text:PDF(492.5KB)

A Unique Word Detection Method and Its Error Rate Performance
Akira OGAWA Hideo OKINAKA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1981/09/25
Vol. E64-E  No. 9  pp. 595-601
Type of Manuscript:  PAPER
Category: Applications
Keyword: 
 Summary | Full Text:PDF(482.6KB)