双空间耦合LDPC码滑窗译码算法改进

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中图分类号：TN911.22 文献标志码：A 文章编号： 1000-5013（2025）04-0448-（

Improvement of Sliding Window Decoding Algorithm for Double Spatially Coupled LDPC Codes

LIAN Qiufang， SUN Xiaofang，CHEN Qiwang，LU Zijun，ZHOU Lin

（College of Information Science and Engineering，Huaqiao University，Xiamen 361O21，China）

Abstract：With regard to the decoding performance optimization issue of double spatially coupled low-density parity-check （LDPC） codes in a joint source-channel coding system，a supervised sliding-window decoding algorithm is proposed. First，supervisor bits are incorporated within the current decoding window.Then，the supervisor bits supervise the most reliable log-likelihood values and the minimum average error probabilities within the current window， they are placed into the corresponding positions in the memory， respectively. Next，the codewords within the window undergo the next round of iteration until the decoding termination conditions are met. Finally，the decoder estimates the decoding result based on the stored log-likelihood values. Simulation results show that under both additive Gaussian white noise and Rayleigh fading channels，the performance of the supervision sliding-window decoding algorithm is significantly improved in both the eror floor and waterfall regions.

Keywords：joint source-channel coding；double spatially coupled LDPC code； sliding window decoding algorithm；supervision

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