Chang-Jun AHN


Achievement Accurate CSI for AF Relay MIMO/OFDM Based on Complex HTRCI Pilot Signal with Enhanced MMSE Equalization
Yuta IDA Chang-Jun AHN Takahiro MATSUMOTO Shinya MATSUFUJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/11/01
Vol. E98-A  No. 11  pp. 2254-2262
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: 
Keyword: 
AF relay transmissionsMIMOOFDMcomplex HTRCI pilot signalenhanced MMSE equalization
 Summary | Full Text:PDF(1.8MB)

Removing Deep Faded Subcarrier Channel for Cooperative Multiuser Diversity OFDMA Based on Low Granularity Block
Yuta IDA Chang-Jun AHN Takahiro MATSUMOTO Shinya MATSUFUJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/12/01
Vol. E97-A  No. 12  pp. 2586-2594
Type of Manuscript:  Special Section PAPER (Special Section on Signal Design and Its Applications in Communications)
Category: Communication Theory and Signals
Keyword: 
multiuser diversity OFDMAlow granularity blockcooperative communicationsdeep faded subcarrier channel
 Summary | Full Text:PDF(2.3MB)

Single Symbol Decodable QO-STBC with Full Diversity
Naotoshi YODA Chang-Jun AHN Ken-ya HASHIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/01/01
Vol. E97-A  No. 1  pp. 2-6
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: Foundations
Keyword: 
QO-STBCsymbol modificationpower imbalancetransmission diversity
 Summary | Full Text:PDF(814.8KB)

Heterogeneous Constellation Based QOSTBC for Improving Detection Property of QRD-MLD
Chang-Jun AHN Ken-ya HASHIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/08/01
Vol. E95-B  No. 8  pp. 2674-2677
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
OSTBCQOSTBCMIMOQRD-MLDheterogeneous constellation
 Summary | Full Text:PDF(281.5KB)

Performance Enhancement of MQRD-PCM/MIMO-OFDM Using Channel Ranking Based Joint Symbols Detection
Chang-Jun AHN 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/08/01
Vol. E92-A  No. 8  pp. 1913-1919
Type of Manuscript:  Special Section PAPER (Special Section on Signal Processing)
Category: Communications
Keyword: 
OFDMMIMOMQRD-PCMchannel rankinginter-antenna interference (IAI)
 Summary | Full Text:PDF(343.7KB)

Link Correlation Based Transmit Sector Antenna Selection for Alamouti Coded OFDM
Chang-Jun AHN 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/03/01
Vol. E92-A  No. 3  pp. 816-823
Type of Manuscript:  Special Section PAPER (Special Section on Latest Advances in Fundamental Theories of Signal Processing)
Category: 
Keyword: 
MIMOFBIOFDMantenna selectionsector antenna
 Summary | Full Text:PDF(743.5KB)

Throughput Improvement with Discrete Pilot Signal Assignment and Iterative Channel Identification for MQRD-PCM/OFDM
Chang-Jun AHN 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/08/01
Vol. E91-A  No. 8  pp. 2000-2007
Type of Manuscript:  Special Section PAPER (Special Section on Signal Processing)
Category: 
Keyword: 
MIMOOFDMQR decompositionMQRD-PCM
 Summary | Full Text:PDF(557.9KB)

Accurate Channel Identification with Time-Frequency Interferometry for OFDM
Chang-Jun AHN 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/11/01
Vol. E90-A  No. 11  pp. 2641-2645
Type of Manuscript:  LETTER
Category: Communication Theory and Signals
Keyword: 
OFDMtime-frequency interferometryCSI
 Summary | Full Text:PDF(254.2KB)

Subcarrier Block Power Control for Adaptive Downlink OFDM with Frequency Spreading and Equalization
Nam-Su KIM Sungho CHO Chang-Jun AHN 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/07/01
Vol. E89-B  No. 7  pp. 2102-2105
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
subcarrier block power controlfrequency symbol spreadingMMSEC
 Summary | Full Text:PDF(345.8KB)

Superimposed Frequency Symbol Based Adaptive Downlink OFDM with Frequency Spreading and Equalization
Chang-Jun AHN Hiroshi HARADA Yukiyoshi KAMIO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/02/01
Vol. E89-B  No. 2  pp. 500-508
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
AMS/OFDMfrequency symbol spreadingfrequency equalizationMMSECORC
 Summary | Full Text:PDF(660KB)

Stochastic Method of Determining Substream Modulation Levels for MIMO Eigenbeam Space Division Multiplexing
Satoshi TAKAHASHI Chang-Jun AHN Hiroshi HARADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/01/01
Vol. E89-B  No. 1  pp. 142-149
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
mobile radio propagationadaptive modulationmultipath environmentsray tracingMIMOE-SDM
 Summary | Full Text:PDF(464.2KB)

Adaptive Subcarrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Downlink OFDM Using Uplink Delay Spread
Chang-Jun AHN Satoshi TAKAHASHI Hiroshi HARADA Yukiyoshi KAMIO Iwao SASASE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/07/01
Vol. E88-A  No. 7  pp. 1889-1896
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: Wireless Communication Technology
Keyword: 
DMPSA-ASMS/OFDMMLIcoherence bandwidthRMS delay spread
 Summary | Full Text:PDF(592.2KB)

Effect of Delay Spread Enhancement in MIMO Eigenbeam Space Division Multiplexing Transmission
Satoshi TAKAHASHI Chang-Jun AHN Hiroshi HARADA Yukiyoshi KAMIO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/07/01
Vol. E88-A  No. 7  pp. 1931-1935
Type of Manuscript:  Special Section LETTER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
radio propagationdelay spreadMIMOE-SDM
 Summary | Full Text:PDF(392.6KB)

Differential Modulated Pilot Symbol Assisted Adaptive OFDM for Reducing the MLI with Predicted FBI
Chang-Jun AHN Satoshi TAKAHASHI Hiroshi HARADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/02/01
Vol. E88-B  No. 2  pp. 436-442
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part2)
Category: 
Keyword: 
AMS/OFDMMLIFBI
 Summary | Full Text:PDF(520.1KB)

Reverse Link Performance Improvement for Wideband OFDM Using Alamouti Coded Heterogeneous Polarization Antennas
Chang-Jun AHN Yukiyoshi KAMIO Satoshi TAKAHASHI Hiroshi HARADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/11/01
Vol. E87-B  No. 11  pp. 3281-3288
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
OFDMSTBCpolarizationXPD
 Summary | Full Text:PDF(602.8KB)

Iterative Decoding with LDPC Based Unitary Matrix Modulated OFDM with Splitting the Diagonal Components over the Coherence Bandwidth
Chang-Jun AHN 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/08/01
Vol. E87-B  No. 8  pp. 2411-2414
Type of Manuscript:  LETTER
Category: Wireless Communication Technology
Keyword: 
LDPCOFDMcoherence bandwidthunitary matrix
 Summary | Full Text:PDF(277.4KB)

Multiple Pre-Rake Filtering Based on the Predicted Channel Impulse Response in the Transmitter and a Rake Combiner in the Receiver for TDD/DS-CDMA Mobile Communication Systems
Chang-Jun AHN Iwao SASASE 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/10/01
Vol. E85-B  No. 10  pp. 2282-2291
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
CDMARake receiverpre-Rake systemtime division duplex (TDD)
 Summary | Full Text:PDF(771.4KB)

Code Orthogonalizing Filter Based Adaptive Array Antenna Using Common Correlation Matrix of Time Domain Signals for Multicarrier DS/CDMA Systems
Chang-Jun AHN Iwao SASASE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/07/01
Vol. E85-A  No. 7  pp. 1604-1611
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
MC-DS/CDMAcode orthogonalizing filter (COF)sample matrix inversion (SMI)adaptive array antennacommon correlation matrix
 Summary | Full Text:PDF(667.6KB)