Distortion Exponents of Two-Way Relaying Networks With Multiple-Access Broadcast Protocol
In this paper, the authors study the end-to-end distortions when transmitting two Gaussian signals in a three-node, half-duplex, and two-way relaying network, where two users communicate in both directions with the help of one relay, and can transmit at different rates. They focus on the two-phase Multiple-Access Broad-Cast (MABC) cooperation protocol with Decode-and-Forward (DF), Amplify-and-Forward (AF), or Compress-and-Forward (CF) strategy at the relay. In each case, they analyze the achievable distortion exponents of the two sources at high Signal-to-Noise Ratio (SNR) regime. The results illustrate the effects of the bandwidth ratio and cooperation strategies on the optimized distortion exponents. They also derive the achievable diversity-multiplexing gain trade-offs of these two-way relaying protocols.