Soft-decision decoding of block codes: a factor-graph approach (無線通信システム)
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概要
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Linear block codes capable of correcting a burst of bit errors are desirable for protection of control plane data in mobile networks because of their effectiveness and low overhead. Yet most decoding schemes for block codes use hard decisions. The recent use of low-density parity-check (LDPC) decoders based on factor-graph, sum-product algorithm (SPA) promise improved performance over hard-decision block decoding for codes with large and sparse parity-check matrices. This requirement has thus far limited the application of SPA to most well-known block codes. We present a simple modification of SPA which can handle non-sparse matrices. We illustrate the advantage of this approach in the case of Reed-Solomon (RS) codes.
- 2009-02-25
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