The Error Probability of Sparse Superposition Codes With Approximate Message Passing Decoding
The Error Probability of Sparse Superposition Codes With Approximate Message Passing Decoding
复制标题
稀疏叠加码近似消息传递译码的错误概率
DOI:
10.1109/tit.2018.2882177
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发表时间:
2019
影响因子:
2.5
通讯作者:
Rush C
中科院分区:
文献类型:
--
作者:
Rush C
Sparse superposition codes, or sparse regression codes, are a recent class of codes for reliable communication over the AWGN channel at rates approaching the channel capacity. Approximate message passing (AMP) decoding, a computationally efficient technique for decoding SPARCs, has been proven to be asymptotically capacity-achieving for the AWGN channel. In this paper, we refine the asymptotic result by deriving a large deviation bound on the probability of an AMP decoding error. This bound gives insight into the error performance of the AMP decoder for large but finite problem sizes, giving an error exponent as well as guidance on how the code parameters should be chosen at finite block lengths. For an appropriate choice of code parameters, we show that for any fixed rate less than the channel capacity, the decoding error probability decays exponentially in n/(logn)2T, where T, the number of AMP iterations required for successful decoding, is bounded in terms of the gap from capacity.
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