A novel decoding-and-forward scheme with joint modulation for two-way relay channel

Authors:
Zhiyong Chen;Hui Liu;Wenbo Wang
Affiliations:
University of Washington, and Beijing University of Posts and Telecommunications;Department of Electrical Engineering, University of Washington, Seattle, WA;Key Laboratory of Universal Wireless Communications for the Ministry of Education, Beijing University of Posts and Telecommunications, Beijing, China
Venue:
IEEE Communications Letters
Year:
2010

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Abstract

In this letter, a novel decode-and-forward (DF) strategy for the two-way relay over Rayleigh fading channels is presented and analyzed. By encoding the two messages jointly at the relay node, the proposed scheme (termed DF-JM) can effectively handle matched or unmatched data rates from the two sources. In addition, it is possible to design optimal constellation labeling maps at the relay node, so that the minimum Euclidean distance among the desired points can be maximized for side-information based demodulation at the destinations. Simulation results indicate that the DF-JM approach performs better than existing DF schemes and the denoise-and-forward (DNF) scheme in terms of the end-to-end bit error rate (BER).