Computer Science – Information Theory
Scientific paper
2012-01-16
Computer Science
Information Theory
27 pages, 11 Figures, Submitted to IEEE Transactions on Communications
Scientific paper
In this paper, we propose a new distributed coding structure with a soft input soft output (SISO) relay encoder for error-prone parallel relay channels. We refer to it as the distributed soft coding (DISC). In the proposed scheme, each relay first uses the received noisy signals to calculate the soft symbol estimate (SSE) of the source symbols. A simple SISO encoder is developed to encode the SSEs of source symbols based on a constituent code generator matrix. The SISO encoder outputs at different relays are then forwarded to the destination and form a distributed codeword. The performance of the proposed scheme is analyzed. It is shown that its performance is determined by the generator sequence weight (GSW) of the relay constituent codes, where the GSW of a constituent code is defined as the number of ones in its generator sequence. A new coding design criterion for optimally assigning the constituent codes to all the relays is proposed based on the analysis. Results show that the proposed DISC can effectively circumvent the error propagation due to the decoding errors in the conventional decode and forward (DF) protocols and at the same time bring considerable coding gains, compared to the conventional soft information relaying (SIR).
Li Yonghui
Vucetic Branka
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