Ken UMENO

Randomization Approaches for Reducing PAPR with Partial Transmit Sequence and Semidefinite Relaxation
Hirofumi TSUDA Ken UMENO 
Publication:   
Publication Date: 2021/03/01
Vol. E104-B  No. 3  pp. 262-276
Type of Manuscript:  PAPER
Category: Transmission Systems and Transmission Equipment for Communications
Keyword: 
orthogonal frequency division multiplexing (OFDM), peak-to-average power ratio (PAPR), partial transmit sequence, semidefinite relaxation, randomization algorithm, 
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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 number, statistical test, NIST SP800-22, discrete Fourier transform, 
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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 CDMA, nonlinear programming, spreading sequence, signal to interference plus noise ratio, bit error rate, 
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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: 
chaos, CDMA, fading, power line channel, 
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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), chaos, code division multiple access (CDMA), spreading sequence, band-limited signals, 
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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: 
chaos, complex code division multiple access, spreading sequence, 
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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: 
chaos, CDMA, ergodic theory, digital filter, Lebesgue spectrum, 
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