Recovering Multiplexing Loss through Concurrent Decode-and-Forward (DF) Relaying |
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| Authors: | Chao Wang Yijia Fan John S Thompson |
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| Affiliation: | (1) Institute for Digital Communications, Joint Research Institute for Signal and Image Processing, School of Engineering and Electronics, University of Edinburgh, Edinburgh, EH9 3JL, UK |
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| Abstract: | In this paper, we develop a novel digital cooperative diversity transmission protocol for a two-source scenario by combining
the two sources’ two classic decode-and-forward (DF) relaying steps and using 2L + 1 time slots to transmit L codewords from each source. Assuming the relays can perfectly decode their associated source messages, we give an information-theoretic
average achievable capacity region for this transmission scheme. Through diversity-multiplexing tradeoff analysis, we show
that our so called concurrent DF relaying protocol can effectively recover the multiplexing loss induced by the half-duplex
operation in the relays, while still obtaining some diversity gain. Numerical results reveal our scheme offers significant
performance advantages over the classic DF relaying protocols, especially for high signal-to-noise ratio (SNR) and large frame
length L regime.
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| Keywords: | Cooperative diversity Concurrent decode-and-forward (DF) relaying Capacity region Diversity-multiplexing tradeoff |
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