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LDPC-based space-time coded OFDM systems with channel estimation

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4 Author(s)
Syed, M.J. ; Groupe d''Etude des Syst. de Telecommun., Ecole Nat. Superieure d''Ingenieurs de Limoges, France ; Cances, J.-P. ; Meghdadi, V. ; Dumas, J.M.

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.

Published in:

Communications, IEE Proceedings-  (Volume:151 ,  Issue: 6 )