DocumentCode :
1191233
Title :
LDPC-based space-time coded OFDM systems with channel estimation
Author :
Syed, M.J. ; Cances, J.-P. ; Meghdadi, V. ; Dumas, J.M.
Author_Institution :
Groupe d´´Etude des Syst. de Telecommun., Ecole Nat. Superieure d´´Ingenieurs de Limoges, France
Volume :
151
Issue :
6
fYear :
2004
Firstpage :
567
Lastpage :
573
Abstract :
The authors consider a space-time coded (STC) orthogonal frequency-division multiplexing (OFDM) system with multiple transmitter and receiver antennas over correlated frequency- and time-selective fading channels. They propose first a maximum-likelihood (ML) receiver for space-time block code OFDM systems based on the expectation-maximisation (EM) algorithm. They then propose a low-density parity-check (LDPC)-code-based STC-OFDM system to interface with the EM algorithm. When comparing the proposed scheme with the conventional space-time trellis code, the LDPC-based STC significantly improves the system performance by exploiting both spatial and selective-fading diversity in wireless channels. Compared with the recently proposed turbo-code-based STC scheme, LDPC-based STC exhibits a lower complexity and more flexible scalability.
Keywords :
OFDM modulation; antenna arrays; block codes; channel estimation; dispersive channels; diversity reception; fading channels; iterative decoding; parity check codes; radio receivers; receiving antennas; space-time codes; transmitting antennas; LDPC; OFDM system; channel estimation; expectation-maximisation algorithm; low-density parity-check; maximum-likelihood receiver; multiple transmitter antennas; orthogonal frequency-division multiplexing; receiver antennas; selective-fading diversity; space-time block code; time-selective fading channel;
fLanguage :
English
Journal_Title :
Communications, IEE Proceedings-
Publisher :
iet
ISSN :
1350-2425
Type :
jour
DOI :
10.1049/ip-com:20040568
Filename :
1370500
Link To Document :
بازگشت