Amplify-and-forward cooperative OFDM with multiple-relays: performance analysis and relay selection methods

Authors:
Yanwu Ding;Murat Uysal
Affiliations:
Department of Electrical Engineering and Computer Science, Wichita State University, Fairmount, Wichita;Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 8
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Multi-relay cooperative OFDM with amplify-and-forward relaying

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Multi-relay cooperative OFDM with amplify-and-forward relaying

RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium

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Abstract

In this paper, we investigate a cooperative system with multiple relays and amplify-and-forward relaying over frequency-selective channels. To extract the available multipath diversity, we employ orthogonal frequency division multiplexing (OFDM) with precoding. Through the derivation of pairwise error probability (PEP), we demonstrate that PEP is not a simple exponential function of the signal-to-noise ratio (SNR), but it includes a term that involves some power of logarithm of the SNR. If that term is ignored, the diversity order is given by the summation of the channel length in the direct link and the minimum of channel lengths in each relaying link confirmed by simulation results. Based on the PEP expression, we also propose two relay selection strategies; one is on a per-subcarrier basis and the other is on an all-subcarrier basis. Our simulation results indicate that both strategies result in performance improvements although the per-subcarrier method performs better.