Keigo TAKEUCHI


A Family of Counterexamples to the Central Limit Theorem Based on Binary Linear Codes
Keigo TAKEUCHI 
Publication:   
Publication Date: 2019/05/01
Vol. E102-A  No. 5  pp. 738-740
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
central limit theoremdependent random variablescounterexamplesbinary linear codes
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Asymptotic Optimality of QPSK Faster-than-Nyquist Signaling in Massive MIMO Systems
Keigo TAKEUCHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/12/01
Vol. E99-A  No. 12  pp. 2192-2201
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communication Theory and Systems
Keyword: 
Faster-than-Nyquist signalingquadrature phase-shift keying (QPSK)massive multiple-input multiple-output (MIMO)mutual informationreplica method
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Iterative Channel Estimation and Decoding via Spatial Coupling
Shuhei HORIO Keigo TAKEUCHI Tsutomu KAWABATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/02/01
Vol. E98-A  No. 2  pp. 549-557
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
spatial couplingbit-interleaved coded modulation (BICM)channel estimationiterative decodingdensity evolution
 Summary | Full Text:PDF(1.4MB)

A Phenomenological Study on Threshold Improvement via Spatial Coupling
Keigo TAKEUCHI Toshiyuki TANAKA Tsutomu KAWABATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/05/01
Vol. E95-A  No. 5  pp. 974-977
Type of Manuscript:  LETTER
Category: Information Theory
Keyword: 
spatial couplingthreshold saturationbelief propagation (BP)dynamical systems
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Bias-Based Training for Iterative Channel Estimation and Data Decoding in Fast Fading Channels
Keigo TAKEUCHI Ralf R. MULLER Mikko VEHKAPERA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/07/01
Vol. E94-B  No. 7  pp. 2161-2165
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
bias-based channel estimationiterative decodingfast fading channelsbelief propagation
 Summary | Full Text:PDF(344.1KB)