WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 14, 2015
Performance Evaluation of Cooperative Versus Receiver Coded Diversity
Authors: , ,
Abstract: The amplify-and-forward and the decode-and-forward cooperative coded diversity are compared with the conventional receiver coded diversity in terms of the pairwise error probability and the overall bit error rate. The diversity systems under consideration can achieve the diversity order at most two. The performance comparison assumes channel coding with non-binary linear modulations, independent fading channels with path-loss attenuations proportional to the distances between the communicating nodes, and the diversity combining at the destination receiver. The expressions for the pairwise error probabilities are obtained analytically and verified by computer simulations. The performance of the cooperative diversity is found to be strongly relay location dependent. Hence, using the analytical as well as extensive numerical results, the geographical areas of the relay locations are obtained for small to medium signal-to-noise ratio values, such that the cooperative coded diversity outperforms the receiver coded diversity. On the other hand, for sufficiently large signal-to-noise ratio values, or if the path-loss attenuations are not considered, then the receiver coded diversity always outperforms the cooperative coded diversity. The obtained results have important implications on the deployment of the next generation cellular systems supporting the cooperative as well as the receiver diversity.
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Keywords: Channel coding, communication system performance, cooperative systems, diversity methods, fading channels
Pages: 309-324
WSEAS Transactions on Communications, ISSN / E-ISSN: 1109-2742 / 2224-2864, Volume 14, 2015, Art. #36