Sadayuki ABETA


Performance Evaluation of LTE-Advanced Heterogeneous Network Deployment Using Carrier Aggregation between Macro and Small Cells
Takahiro TAKIGUCHI Kohei KIYOSHIMA Yuta SAGAE Kengo YAGYU Hiroyuki ATARASHI Sadayuki ABETA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1297-1305
Type of Manuscript:  Special Section PAPER (Special Section on Heterogeneous Networks for Future Cellular Systems)
Category: 
Keyword: 
LTE-Advanced (LTE-A)carrier aggregationheterogeneous networksmall cell
 Summary | Full Text:PDF(2.7MB)

Field and Indoor Experimental Results of E-UTRA Uplink
Naoto OKUBO Yoshiaki OFUJI Sadayuki ABETA Takehiro NAKAMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/05/01
Vol. E92-B  No. 5  pp. 1714-1724
Type of Manuscript:  Special Section PAPER (Special Section on Radio Access Techniques for 3G Evolution)
Category: 
Keyword: 
Evolved UTRA uplinkAMCTPCvariable RB allocation
 Summary | Full Text:PDF(1.7MB)

Comparison of Throughput Employing Hybrid ARQ Packet Combining in Forward Link OFCDM Broadband Packet Wireless Access
Nobuhiko MIKI Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/02/01
Vol. E88-B  No. 2  pp. 594-603
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part2)
Category: 
Keyword: 
OFCDMhybrid ARQincremental redundancyChase combining
 Summary | Full Text:PDF(1.6MB)

Unified Packet Scheduling Method Considering Delay Requirement in OFCDM Forward Link Broadband Wireless Access
Yoshiaki OFUJI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 170-182
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Scheduling
Keyword: 
fast packet schedulingOFCDMQoSdelay
 Summary | Full Text:PDF(2.7MB)

Cell Selection Based on Shadowing Variation for Forward Link Broadband OFCDM Packet Wireless Access
Akihito MORIMOTO Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 150-158
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Cell Selection
Keyword: 
broadband packet wireless accessOFCDMcell selectionhard handovershadowing
 Summary | Full Text:PDF(1.6MB)

Comparison of Packet Scheduling Algorithms Focusing on User Throughput in High Speed Downlink Packet Access
Yoshiaki OFUJI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 132-141
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
packet schedulingHSDPAuser throughputcoverage
 Summary | Full Text:PDF(1.4MB)

Adaptive Radio Parameter Control Considering QoS for Forward Link OFCDM Wireless Access
Atsushi HARADA Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 314-324
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
broadband packet wireless accessforward linkQoS controlHARQadaptive modulation and channel coding
 Summary | Full Text:PDF(1.9MB)

Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) for Broadband Packet Wireless Access
Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 291-299
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
broadband packet wireless accessOFCDMOFDMvariable spreading factorVSF-OFCDM
 Summary | Full Text:PDF(1.4MB)

Multipath Interference Canceller Employing Multipath Interference Replica Generation with Previously Transmitted Packet Combining for Incremental Redundancy in HSDPA
Nobuhiko MIKI Sadayuki ABETA Hiroyuki ATARASHI Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 142-153
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
multipath interference cancellerhybrid ARQsoft-decisionhigh-speed downlink packet access
 Summary | Full Text:PDF(2.2MB)

Performance of Fast Cell Selection Coupled with Fast Packet Scheduling in High-Speed Downlink Packet Access
Akihito MORIMOTO Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/10/01
Vol. E85-B  No. 10  pp. 2021-2031
Type of Manuscript:  Special Section PAPER (Special Issue on Mobile Multimedia Communications)
Category: 
Keyword: 
mobile radiohigh-speed downlink packet accesshandoverfast cell selectionpacket scheduling
 Summary | Full Text:PDF(2.3MB)

Antenna Diversity Reception Appropriate for MMSE Combining in Frequency Domain for Forward Link OFCDM Packet Wireless Access
Noriyuki MAEDA Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/10/01
Vol. E85-B  No. 10  pp. 1966-1977
Type of Manuscript:  Special Section PAPER (Special Issue on Mobile Multimedia Communications)
Category: 
Keyword: 
broadband wireless accessforward linkOFCDMantenna diversity
 Summary | Full Text:PDF(2.1MB)

Comparison of Hybrid ARQ Packet Combining Algorithm in High Speed Downlink Packet Access in a Multipath Fading Channel
Nobuhiko MIKI Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/07/01
Vol. E85-A  No. 7  pp. 1557-1568
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
hybrid ARQadaptive modulation and codingmultipath interference cancellerhigh speed downlink packet access
 Summary | Full Text:PDF(2.2MB)

Pilot Channel Assisted MMSE Combining in Forward Link for Broadband OFCDM Packet Wireless Access
Noriyuki MAEDA Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/07/01
Vol. E85-A  No. 7  pp. 1635-1646
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
broadband packet wireless accessforward linkOFCDMpilot channel assisted MMSE combining
 Summary | Full Text:PDF(3.3MB)

Optimum Bandwidth per Sub-Carrier of Multicarrier/DS-CDMA for Broadband Packet Wireless Access in Reverse Link
Shingo SUWA Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/07/01
Vol. E85-A  No. 7  pp. 1624-1634
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
broadband packet wireless accessreverse linkmulticarrier/DS-CDMAoptimum bandwidth
 Summary | Full Text:PDF(2MB)

Comparison of Hybrid ARQ Schemes and Optimization of Key Parameters for High-Speed Packet Transmission in W-CDMA Forward Link
Nobuhiko MIKI Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/07/01
Vol. E84-A  No. 7  pp. 1681-1690
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
mobile radioW-CDMAhigh-speed downlink packet accesshybrid ARQ
 Summary | Full Text:PDF(1011.4KB)

Performance Evaluation of Coherent High-Speed TD-OFCDM Broadband Packet Wireless Access in Forward Link Employing Multi-Level Modulation and Hybrid ARQ
Hiroyuki ATARASHI Sadayuki ABETA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/07/01
Vol. E84-A  No. 7  pp. 1670-1680
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
broadband packet wireless accessforward linkTD-OFCDMmulti-level modulationhybrid ARQ
 Summary | Full Text:PDF(2.1MB)

Performance of Coherent Multi-Carrier/DS-CDMA and MC-CDMA for Broadband Packet Wireless Access
Sadayuki ABETA Hiroyuki ATARASHI Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 406-414
Type of Manuscript:  Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21st Century)
Category: 
Keyword: 
broadband packet wireless accesssingle-carrier/DS-CDMAmulti-carrier/DS-CDMAmulticarrier CDMA
 Summary | Full Text:PDF(1.1MB)

Adaptive Channel Estimation for Coherent DS-CDMA Mobile Radio Using Time-Multiplexed Pilot and Parallel Pilot Structures
Sadayuki ABETA Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/09/25
Vol. E82-B  No. 9  pp. 1505-1513
Type of Manuscript:  PAPER
Category: Mobile Communication
Keyword: 
adaptive channel estimationDS/CDMApilot channelcoherent RAKE
 Summary | Full Text:PDF(569.8KB)

Performance Comparison between Time-Multiplexed Pilot Channel and Parallel Pilot Channel for Coherent Rake Combining in DS-CDMA Mobile Radio
Sadayuki ABETA Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/07/25
Vol. E81-B  No. 7  pp. 1417-1425
Type of Manuscript:  Special Section PAPER (Special Issue on Third Generation Land Mobile Communication Systems)
Category: 
Keyword: 
DS-CDMAchannel estimationpilot channeltransmitter power control
 Summary | Full Text:PDF(701.7KB)

Adaptive Coding Rate and Process Gain Control with Channel Activation for Multi-Media DS/CDMA Systems
Sadayuki ABETA Seiichi SAMPEI Norihiko MORINAGA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/04/25
Vol. E80-B  No. 4  pp. 581-588
Type of Manuscript:  PAPER
Category: Radio Communication
Keyword: 
DS/CDMAchannel activationsoft power controladaptive modulation
 Summary | Full Text:PDF(601.5KB)