The Half-Duplex AWGN Single-Relay Channel: Full Decoding or Partial Decoding?

Details The Half-Duplex AWGN Single-Relay Channel: Full Decoding or Partial Decoding? The Half-Duplex AWGN Single-Relay Channel: Full Decoding or Partial Decoding?

2011-11-09

arxiv.org/abs/1111.2098v1

Computer Science

Information Theory

submitted to IEEE Transactions on Communications

Scientific paper

This paper compares the partial-decode-forward and the complete-decode-forward coding strategies for the half-duplex Gaussian single-relay channel. We analytically show that partial-decode-forward outperforms the more straightforward complete-decode-forward by at most 12.5%, for any channel parameters. Furthermore, in the following asymptotic cases, complete-decode-forward achieves the same rates as partial-decode-forward does: (i) when the relay is close to the source, (ii) when the relay is close to the destination, and (iii) when the SNR is low. In addition, when the SNR increases, the normalized gap between the rates achievable by the two coding strategies diminishes. Consequently, significant performance improvements are not achieved by optimizing the fraction of data the relay should decode and forward.

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