Takafumi FUJITA

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 modem, ubiquitous, transmission efficiency, burst synchronization, testbed 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 LAN, MIMO, OFDM, packet mode, synchronization, 
 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: 
OFDM, SDM, MIMO, MLD, Zero-Forcing, K-best, M-algorithm, IEEE 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 LAN, multiple-cell environment, universal frequency reuse, OFDM, MC/CDMA, fallback, 
 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 LANs, OFDM, CSMA/CA, cell throughput, system capacity, 
 Summary | Full Text:PDF(1.3MB)