Keigo TAKEUCHI


On the Convergence of Convolutional Approximate Message-Passing for Gaussian Signaling
Keigo TAKEUCHI 
Publication:   
Publication Date: 2022/02/01
Vol. E105-A  No. 2  pp. 100-108
Type of Manuscript:  PAPER
Category: Communication Theory and Signals
Keyword: 
linear inverse problemsconvolutional approximate message-passingstate evolutionGaussian signalingbifurcation analysis
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Finite-Size Correction of Expectation-Propagation Detection
Yuki OBA Keigo TAKEUCHI 
Publication:   
Publication Date: 2022/01/01
Vol. E105-A  No. 1  pp. 77-81
Type of Manuscript:  LETTER
Category: Communication Theory and Signals
Keyword: 
compressed sensingmassive multiple-input multiple-output (MIMO)expectation propagationstate evolutionvariance correction
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Pilot Decontamination in Spatially Correlated Massive MIMO Uplink via Expectation Propagation
Wataru TATSUNO Keigo TAKEUCHI 
Publication:   
Publication Date: 2021/04/01
Vol. E104-A  No. 4  pp. 723-733
Type of Manuscript:  PAPER
Category: Communication Theory and Signals
Keyword: 
massive MIMOspatial correlationpilot contaminationtime-shifted pilotsexpectation propagation (EP)
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Expectation-Propagation Detection for Generalized Spatial Modulation with Sparse Orthogonal Precoding
Tatsuya SUGIYAMA Keigo TAKEUCHI 
Publication:   
Publication Date: 2021/03/01
Vol. E104-A  No. 3  pp. 661-664
Type of Manuscript:  LETTER
Category: Communication Theory and Signals
Keyword: 
compressed sensinggeneralized spatial modulationmultiple-input multiple-output (MIMO)sparse orthogonal matricesexpectation propagation
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Expectation Propagation Decoding for Sparse Superposition Codes
Hiroki MAYUMI Keigo TAKEUCHI 
Publication:   
Publication Date: 2020/12/01
Vol. E103-A  No. 12  pp. 1666-1669
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
sparse superposition codesorthogonal frequency division multiplexing (OFDM)discrete Fourier transform (DFT) dictionaryapproximate message-passingexpectation propagation
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Pilot Decontamination in Massive MIMO Uplink via Approximate Message-Passing
Takumi FUJITSUKA Keigo TAKEUCHI 
Publication:   
Publication Date: 2020/12/01
Vol. E103-A  No. 12  pp. 1356-1366
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communication Theory
Keyword: 
massive MIMOpilot contaminationjoint channel and data estimationapproximate message-passing (AMP)
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Hardware-Aware Sum-Product Decoding in the Decision Domain
Mizuki YAMADA Keigo TAKEUCHI Kiyoyuki KOIKE 
Publication:   
Publication Date: 2019/12/01
Vol. E102-A  No. 12  pp. 1980-1987
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
low-density parity-check (LDPC) codessum-product (SP) decodinghardware implementationdecision domainpolynomial approximation
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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
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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
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