Ken UMENO


Randomness Test to Solve Discrete Fourier Transform Test Problems
Atsushi IWASAKI Ken UMENO 
Publication:   
Publication Date: 2018/08/01
Vol. E101-A  No. 8  pp. 1204-1214
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
random numberstatistical testNIST SP800-22discrete Fourier transform
 Summary | Full Text:PDF(922.5KB)

Weyl Spreading Sequence Optimizing CDMA
Hirofumi TSUDA Ken UMENO 
Publication:   
Publication Date: 2018/03/01
Vol. E101-B  No. 3  pp. 897-908
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
asynchronous CDMAnonlinear programmingspreading sequencesignal to interference plus noise ratiobit error rate
 Summary | Full Text:PDF(1MB)

Performance Evaluation of CDMA Using Chaotic Spreading Sequence with Constant Power in Indoor Power Line Fading Channels
Ryo TAKAHASHI Ken UMENO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/07/01
Vol. E97-A  No. 7  pp. 1619-1622
Type of Manuscript:  LETTER
Category: Nonlinear Problems
Keyword: 
chaosCDMAfadingpower line channel
 Summary | Full Text:PDF(1.1MB)

Performance Evaluation of Band-Limited Baseband Synchronous CDMA Using Orthogonal ICA Sequences
Ryo TAKAHASHI Ken UMENO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/03/01
Vol. E93-A  No. 3  pp. 577-582
Type of Manuscript:  PAPER
Category: Nonlinear Problems
Keyword: 
independent component analysis (ICA)chaoscode division multiple access (CDMA)spreading sequenceband-limited signals
 Summary | Full Text:PDF(233.9KB)

Performance Analysis of Complex CDMA Using Complex Chaotic Spreading Sequence with Constant Power
Ryo TAKAHASHI Ken UMENO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/12/01
Vol. E92-A  No. 12  pp. 3394-3397
Type of Manuscript:  LETTER
Category: Nonlinear Problems
Keyword: 
chaoscomplex code division multiple accessspreading sequence
 Summary | Full Text:PDF(92.8KB)

Construction of Optimal Chaotic Spreading Sequence Using Lebesgue Spectrum Filter
Ken UMENO Akihiro YAMAGUCHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/04/01
Vol. E85-A  No. 4  pp. 849-852
Type of Manuscript:  Special Section LETTER (Special Section of Selected Papers from the 14th Workshop on Circuits and Systems in Karuizawa)
Category: 
Keyword: 
chaosCDMAergodic theorydigital filterLebesgue spectrum
 Summary | Full Text:PDF(181.9KB)