Atsushi OKAMURA

An Equalization of PN-DSTBC for Concatenating with Spectral Precoding
Kanako YAMAGUCHI Nicolas GRESSET Hiroshi NISHIMOTO Akihiro OKAZAKI Hiroyasu SANO Shusaku UMEDA Kaoru TSUKAMOTO Atsushi OKAMURA 
Publication:   
Publication Date: 2019/03/01
Vol. E102-A  No. 3  pp. 544-552
Type of Manuscript:  PAPER
Category: Mobile Information Network and Personal Communications
Keyword: 
extremely high frequency, frequency diversity, spatial diversity, spectral precoding, DSTBC, 
 Summary | Full Text:PDF(2.7MB)
NL-BMD: Nonlinear Block Multi-Diagonalization Precoding for High SHF Wide-Band Massive MIMO in 5G
Hiroshi NISHIMOTO Akinori TAIRA Hiroki IURA Shigeru UCHIDA Akihiro OKAZAKI Atsushi OKAMURA 
Publication:   
Publication Date: 2017/08/01
Vol. E100-B  No. 8  pp. 1215-1227
Type of Manuscript:  Special Section PAPER (Special Section on Radio Access Technologies for 5G Mobile Communications System)
Category: Wireless Communication Technologies
Keyword: 
5G, massive MIMO, MU-MIMO, inter-user interference, precoding, nonlinear block multi-diagonalization, 
 Summary | Full Text:PDF(8.1MB)
Separation of Mixtures of Complex Sinusoidal Signals with Independent Component Analysis
Tetsuo KIRIMOTO Takeshi AMISHIMA Atsushi OKAMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/01/01
Vol. E94-B  No. 1  pp. 215-221
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
independent component analysis, fourth cumulant, complex sinusoidal signals, separation performance, radar, communication, 
 Summary | Full Text:PDF(605.2KB)
Feedforward Power Amplifier Control Method Using Weight Divided Adaptive Algorithm
Kenichi HORIGUCHI Atsushi OKAMURA Masatoshi NAKAYAMA Yukio IKEDA Tadashi TAKAGI Osami ISHIDA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/08/01
Vol. E86-C  No. 8  pp. 1494-1500
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: 
Keyword: 
normalized least mean square, adaptive algorithm, feedforward, power amplifier, microwave, 
 Summary | Full Text:PDF(695KB)
An Algorithm for Improving the Signal to Noise Ratio of Noisy Complex Sinusoidal Signals Using Sum of Higher-Order Statistics
Teruyuki HARA Atsushi OKAMURA Tetsuo KIRIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/09/25
Vol. E81-A  No. 9  pp. 1955-1957
Type of Manuscript:  LETTER
Category: Digital Signal Processing
Keyword: 
higher-order statistics, fourth-order cumulants, signal detection, signal to noise ratio, 
 Summary | Full Text:PDF(181.7KB)