Mobility

Multi-Relay Cooperative NB-LDPC Coding With Non-Binary Repetition Codes

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Executive Summary

In this paper, the authors propose a system based on non-binary Low-Density Parity-Check (LDPC) codes to communicate efficiently over the multiple-relay fading channels, with a simple joint decoding strategy at the receiver end. The particularity of their approach is to rely on non-binary LDPC codes at the source, coupled with multiplicative non-binary local codes at the relays, such that the joint decoding complexity is not increased compared to a system without relays, while preserving the coding gain brought by the re-encoding of the sequence at the relays. They show by simulations on simple configurations that this cooperative scheme is superior to other techniques proposed in the paper, and close to the Gaussian relay channel capacity, even at moderate codeword lengths.

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