Recovering Multiplexing Loss through Concurrent Decode-and-Forward (DF) Relaying

Authors:
Chao Wang;Yijia Fan;John S. Thompson
Affiliations:
Institute for Digital Communications, Joint Research Institute for Signal and Image Processing, School of Engineering and Electronics, University of Edinburgh, Edinburgh, UK EH9 3JL;Institute for Digital Communications, Joint Research Institute for Signal and Image Processing, School of Engineering and Electronics, University of Edinburgh, Edinburgh, UK EH9 3JL;Institute for Digital Communications, Joint Research Institute for Signal and Image Processing, School of Engineering and Electronics, University of Edinburgh, Edinburgh, UK EH9 3JL
Venue:
Wireless Personal Communications: An International Journal
Year:
2009

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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.