Turbo-coded modulation as an alternative to space-time codes: the case of a large number of transmit-and-receive antennas

Andrej Stefanov; Tolga M. Duman

doi:10.1117/12.394098

26 July 2000 Turbo-coded modulation as an alternative to space-time codes: the case of a large number of transmit-and-receive antennas

Andrej Stefanov, Tolga M. Duman

Author Affiliations +

Proceedings Volume 4045, Digital Wireless Communication II; (2000) https://doi.org/10.1117/12.394098
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

In a recent paper we have shown that a simple turbo coded modulation scheme provides significant performance improvement with respect to the properly interleaved space- time trellis codes for block Rayleigh fading channels. The turbo coded modulation scheme for the multiple antenna system is based on a simple encoding procedure which uses the encoder for a binary turbo code and maps the encoded bits to a certain constellation, and a simple decoding procedure which is based on a log-likelihood computation of the transmitted bits and the use of these log-likelihoods in a sub-optimal iterative decoding algorithm. Although the computation of log-likelihoods is not a problem for small number of transmit antennas, the computational complexity at the receiver is too high for the case of large number of transmit antennas. In this paper we present a practical method for handling this problem. In particular, we present a new decoding algorithm which does not suffer from the same computational complexity. Our method is similar to the array processing/group interference suppression scheme developed for space-time trellis coding. We present examples for the case of four transmit-four receive antennas and for the case of eight transmit-eight receiver antennas over block fading channels. We observe gains of around 3 dB at a bit error rate of 10^-5 over the multi-layered space-time trellis coding with symbol interleaving. We also observe that although the current approach is computationally efficient, it results in a considerable performance degradation compared to the original (more complex) approach.

Citation Download Citation

Andrej Stefanov and Tolga M. Duman "Turbo-coded modulation as an alternative to space-time codes: the case of a large number of transmit-and-receive antennas", Proc. SPIE 4045, Digital Wireless Communication II, (26 July 2000); https://doi.org/10.1117/12.394098

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