Takafumi FUJITA


Highly Reliable Radio Access Scheme by Duplicate Transmissions via Multiple Frequency Channels and Suppressed Useless Transmission under Interference from Other Systems
Hideya SO Takafumi FUJITA Kento YOSHIZAWA Maiko NAYA Takashi SHIMIZU 
Publication:   
Publication Date: 2021/06/01
Vol. E104-B  No. 6  pp. 696-704
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
Internet of things (IoT)highly reliable wireless communicationduplicated transmissionmultiple frequency channelsinterference from the other systemsoccupation time ratio
 Summary | Full Text:PDF(2.1MB)

A Burst Modulation/Demodulation Method for Narrowband Ubiquitous Communication Systems
Takafumi FUJITA Daisei UCHIDA Yosuke FUJINO Osamu KAGAMI Kazuji WATANABE 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/11/01
Vol. E91-B  No. 11  pp. 3416-3425
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Technologies for Practical Ubiquitous and Sensor Networks)
Category: 
Keyword: 
burst modemubiquitoustransmission efficiencyburst synchronizationtestbed study
 Summary | Full Text:PDF(3.3MB)

A Synchronization Scheme for Packet Mode MIMO-OFDM Signals in Wireless LAN
Takeshi ONIZAWA Takafumi FUJITA Yusuke ASAI Daisei UCHIDA Atsushi OHTA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/01/01
Vol. E90-B  No. 1  pp. 92-104
Type of Manuscript:  PAPER
Category: Terrestrial Radio Communications
Keyword: 
wireless LANMIMOOFDMpacket modesynchronization
 Summary | Full Text:PDF(1.4MB)

A Reduced-Complexity Signal Detection Scheme Employing ZF and K-Best Algorithms for OFDM/SDM
Takafumi FUJITA Atsushi OHTA Takeshi ONIZAWA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 66-75
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Space Division Multiplexing
Keyword: 
OFDMSDMMIMOMLDZero-ForcingK-bestM-algorithmIEEE 802.11a
 Summary | Full Text:PDF(806.4KB)

A New Very High-Rate Wireless LAN System Employing OFDM and MC/CDMA Signals
Takeshi ONIZAWA Takafumi FUJITA Tetsu SAKATA Masahiro MORIKURA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/05/01
Vol. E87-B  No. 5  pp. 1227-1234
Type of Manuscript:  Special Section PAPER (Special Section on Mobile Multimedia Communications)
Category: Wireless LAN
Keyword: 
wireless LANmultiple-cell environmentuniversal frequency reuseOFDMMC/CDMAfallback
 Summary | Full Text:PDF(1.3MB)

A Scheme to Evaluate Cell Throughput of Multi-Rate Wireless LAN Systems with CSMA/CA
Takafumi FUJITA Takeshi ONIZAWA Satoru HORI Atsushi OHTA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/04/01
Vol. E87-B  No. 4  pp. 880-890
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
wireless LANsOFDMCSMA/CAcell throughputsystem capacity
 Summary | Full Text:PDF(1.3MB)