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In this paper we consider the multiple-relay channel. For this scenario there are two well known results: the decode-and-forward (DAF) result of [Xie and Kumar, 2005] and the estimate-and forward (EAF) result of [Kramer et al., 2005]. However, the EAF result does not lend itself to numerical evaluation due to the large number of parameters to be determined and the non-convex nature of the optimization...
In this work we consider the Gaussian relay channel with coded modulation at the transmitter and an orthogonal relay-destination link. We investigate the application of the estimate-and-forward (EAF) scheme with different mappings at the relay to this scenario. We show that in certain situations a three-level quantization outperforms the Gaussian mapping, which is the common practice in this scenario...
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