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Abstract: We study the capacity of the full-duplex bidirectional or two-way relaychannel with two nodes and one relay. The channels in the forward direction areassumed to be different in general than the channels in the backwarddirection, i.e. channel reciprocity is not assumed. We use the recentlyproposed deterministic approach to capture the essence of the problem and todetermine a good transmission and relay strategy for the Gaussian channel.Depending on the ratio of the individual channel gains, we propose to useeither a simple amplify-and-forward or a particular superposition codingstrategy at the relay. We analyze the achievable rate region and show that thescheme achieves to within 3 bits the cut-set bound for all values of channelgains.



Author: Amir Salman Avestimehr, Aydin Sezgin, David N.C. Tse

Source: https://arxiv.org/



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