Chikara OHTA


Utility-Based Distributed Association Control Scheme with User Guidance for IEEE802.11 Wireless LANs
Takahiro IWAMI Irda ROSLAN Yumi TAKAKI Kyoko YAMORI Chikara OHTA Hisashi TAMAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/08/01
Vol. E98-B  No. 8  pp. 1700-1714
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
IEEE802.11throughput estimationassociation controlhandoveruser guidanceuser utility
 Summary | Full Text:PDF(2MB)

Fair Partitioning of the Downlink Resources of an OFDMA-Based Multi-User Multi-Tier Cellular Network Using Fractional Frequency Reuse
Akindele Segun AFOLABI Erdenebileg MUNKHBAT Yumi TAKAKI Chikara OHTA Hisashi TAMAKI Yoshizo TANAKA Takashi YAMAMOTO Yoji OKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/10/01
Vol. E95-B  No. 10  pp. 3353-3357
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
resource partitioningOFDMAFFRmacrocellfemtocell
 Summary | Full Text:PDF(440.9KB)

Divided Static Random Access Memory for Data Aggregation in Wireless Sensor Nodes
Takashi MATSUDA Shintaro IZUMI Yasuharu SAKAI Takashi TAKEUCHI Hidehiro FUJIWARA Hiroshi KAWAGUCHI Chikara OHTA Masahiko YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/01/01
Vol. E95-B  No. 1  pp. 178-188
Type of Manuscript:  PAPER
Category: Network
Keyword: 
wireless sensor networkdata aggregationdata storage managementSRAM
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A 58-µW Single-Chip Sensor Node Processor with Communication Centric Design
Shintaro IZUMI Takashi TAKEUCHI Takashi MATSUDA Hyeokjong LEE Toshihiro KONISHI Koh TSURUDA Yasuharu SAKAI Hiroshi KAWAGUCHI Chikara OHTA Masahiko YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/03/01
Vol. E93-C  No. 3  pp. 261-269
Type of Manuscript:  Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
cross-layer designsensor networkssensor nodeMAC protocoltime synchronizationlow power
 Summary | Full Text:PDF(1.6MB)

Scheduling Algorithm to Provide QoS over a Shared Wireless Link
Augusto FORONDA Chikara OHTA Hisashi TAMAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/06/01
Vol. E92-B  No. 6  pp. 2160-2167
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless networkmodified largest weighted delay first (M-LWDF)proportional fair (PF)effective bandwidth
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A 433-MHz Rail-to-Rail Voltage Amplifier with Carrier Sensing Function for Wireless Sensor Networks
Takashi TAKEUCHI Shinji MIKAMI Hyeokjong LEE Hiroshi KAWAGUCHI Chikara OHTA Masahiko YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2009/06/01
Vol. E92-C  No. 6  pp. 815-821
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
wireless sensor networkamplifier
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Counter-Based Broadcasting with Hop Count Aware Random Assessment Delay Extension for Wireless Sensor Networks
Shintaro IZUMI Takashi TAKEUCHI Takashi MATSUDA Hiroshi KAWAGUCHI Chikara OHTA Masahiko YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/11/01
Vol. E91-B  No. 11  pp. 3489-3498
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Technologies for Practical Ubiquitous and Sensor Networks)
Category: 
Keyword: 
sensor networkbroadcastfloodingcounter-based scheme
 Summary | Full Text:PDF(1005.5KB)

Cross-Layer Design for Low-Power Wireless Sensor Node Using Wave Clock
Takashi TAKEUCHI Yu OTAKE Masumi ICHIEN Akihiro GION Hiroshi KAWAGUCHI Chikara OHTA Masahiko YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/11/01
Vol. E91-B  No. 11  pp. 3480-3488
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Technologies for Practical Ubiquitous and Sensor Networks)
Category: 
Keyword: 
cross-layer designcrystal oscillatorlong-wave standard time codelow power listeningMAC
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Scheduling Algorithms for Maximizing Throughput with Zero-Forcing Beamforming in a MIMO Wireless System
Augusto FORONDA Chikara OHTA Hisashi TAMAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/06/01
Vol. E91-B  No. 6  pp. 1952-1961
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless networkmultiple-input/multiple-output (MIMO)zero-forcing beamforming (ZFBF)multiuser diversity
 Summary | Full Text:PDF(618.7KB)

Data Transmission Scheduling Based on RTS/CTS Exchange for Periodic Data Gathering Sensor Networks
Takashi MATSUDA Masumi ICHIEN Hiroshi KAWAGUCHI Chikara OHTA Masahiko YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/12/01
Vol. E90-B  No. 12  pp. 3410-3418
Type of Manuscript:  Special Section PAPER (Special Section on Ubiquitous Sensor Networks)
Category: 
Keyword: 
sensor networkdata gatheringschedulingcross-layer
 Summary | Full Text:PDF(703.2KB)

Service Interval Optimization with Delay Bound Guarantee for HCCA in IEEE 802.11e WLANs
Augusto FORONDA Yuhi HIGUCHI Chikara OHTA Masahiko YOSHIMOTO Yoji OKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/11/01
Vol. E90-B  No. 11  pp. 3158-3169
Type of Manuscript:  PAPER
Category: Network
Keyword: 
wireless networkbandwidth optimizationbounded delayscheduler
 Summary | Full Text:PDF(1MB)

Aggregation Efficiency-Aware Greedy Incremental Tree Routing for Wireless Sensor Networks
Shinji MIKAMI Takafumi AONISHI Hironori YOSHINO Chikara OHTA Hiroshi KAWAGUCHI Masahiko YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/10/01
Vol. E89-B  No. 10  pp. 2741-2751
Type of Manuscript:  Special Section PAPER (Special Section on Mobile Multimedia Communications)
Category: 
Keyword: 
sensor networksaggregation efficiencygreedy incremental tree routing
 Summary | Full Text:PDF(989.1KB)

Moment Calculating Algorithm for Busy-period of Discrete-time Finite-capacity M/G/1 Type Queue
Chikara OHTA Masakatu MORII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/01/01
Vol. E85-B  No. 1  pp. 293-304
Type of Manuscript:  PAPER
Category: Network
Keyword: 
discrete-time M/G/1 type queuebusy periodmomentsHOL priority control
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Phase Assignment Algorithm Based on Traffic Measurement for Real-time MPEG Sources in ATM Networks
Shinya TOJO Fumio ISHIZAKI Chikara OHTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 2073-2080
Type of Manuscript:  PAPER
Category: Communication Networks and Services
Keyword: 
ATMMPEG videophase assignmentmeasurement
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Phase Assignment Control for Periodic and Bursty Sources in ATM Networks
Fumio ISHIZAKI Chikara OHTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/07/25
Vol. E82-B  No. 7  pp. 1064-1068
Type of Manuscript:  LETTER
Category: Communication Networks and Services
Keyword: 
ATMphase assignment controlCACperiodic and bursty sourceMPEG
 Summary | Full Text:PDF(201.7KB)

Output Process of Shaper and Switch with Self-Similar Traffic in ATM Networks
Chikara OHTA Fumio ISHIZAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/10/25
Vol. E81-B  No. 10  pp. 1936-1940
Type of Manuscript:  LETTER
Category: Switching and Communication Processing
Keyword: 
self-similar trafficoutput processshaperswitchATM networks
 Summary | Full Text:PDF(344.1KB)

Comparison of Cell Transfer Quality Control for Multimedia Traffic in ATM Networks
Chikara OHTA Katsunori SATO Yoshikuni ONOZATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/08/25
Vol. E80-B  No. 8  pp. 1273-1277
Type of Manuscript:  LETTER
Category: Switching and Communication Processing
Keyword: 
rate-based congestion controlpreventive congestion controlcell transfer quality controlmultimedia environment
 Summary | Full Text:PDF(355.4KB)

Performance Study of Channel Reservation for Ahead Cells in Street Micro-Cellular Systems
Ami KANAZAWA Chikara OHTA Yoshikuni ONOZATO Tsukasa IWAMA Shigetoshi YOSHIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/07/25
Vol. E79-A  No. 7  pp. 990-996
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Informatin Network)
Category: 
Keyword: 
channel reservationdynamic channel assignmentstreet micro-cellular systemchannel changingsforced call termination rate
 Summary | Full Text:PDF(632.4KB)

A Proposal of Quasi-STM Transmission Method in ATM-Based Network
Hideki TODE Noriaki KAMIYAMA Chikara OHTA Miki YAMAMOTO Hiromi OKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/07/25
Vol. E76-B  No. 7  pp. 719-722
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: 
ATMlossfreeno delay jitterhierarchical frameQuasi-STM
 Summary | Full Text:PDF(285.8KB)