瑞利衰落信道中SC-LDPC码滑窗译码算法  

Sliding window decoding of the spatially coupled LDPC code Over Rayleigh fading channels

作　　者：张娅妹 周林[1,2] 陈辰 陈启望 贺玉成[1,2] ZHANG Yamei;ZHOU Lin;CHEN Chen;CHEN Qiwang;HE Yucheng(Xiamen Key Laboratory of Mobile Multimedia Communications,College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China;State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an 710071,China)

机构地区：[1]华侨大学信息学院厦门市移动多媒体通信重点实验室,福建厦门361021 [2]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2020年第6期78-83,共6页Journal of Xidian University

基　　金：国家自然科学基金(61901182,61302095);福建省自然科学基金(2018J01096);厦门市科技计划项目(3502Z20203034);泉州市科技计划(2018C108R);华侨大学研究生科研创新基金(18014082037)。

摘　　要：空间耦合低密度奇偶校验码的滑窗译码具有译码延迟低、复杂度低、所需存储空间小等优点,成为近期研究热点。但目前的研究大都专注于高斯信道。在瑞利衰落信道下,提出了一种根据信道状态信息来扩展译码窗口大小的改进方案,其中采用信噪比估计来获取信道状态信息。在译码过程中,若当前窗口的平均接收信噪比小于预设阈值,则扩展译码窗口的大小后重新迭代。重复上述过程直至当前窗口的平均接收信噪比大于预设阈值或窗口大小扩展到其最大值。最后基于扩展后的窗口进行译码。仿真结果表明,空间耦合低密度奇偶校验码的滑窗译码在瑞利衰落信道下具有较好的性能,且该算法的性能明显优于传统的滑窗译码算法。A recent research hot spot,the sliding window decoding(SWD)of spatially coupled low density parity check(SC-LDPC)codes has the advantages of low decoding latency,low complexity,and small memory requirements.But at present,most of the current research work is focused on Gaussian channels.Over the Rayleigh fading channel,an improved approach to extending the size of the decoding window based on the channel state information(CSI)is proposed,and the CSI is obtained by using the received signal-to-noise ratio(SNR).During the decoding process,if the average received SNR of the current window is less than the preset threshold,the decoding window is extended and then the iteration is performed again.The above process is repeated until the average received SNR of the current window is larger than the preset threshold or the window size is extended to its maximum value,and finally decoding is performed based on the extended window.Simulation results show that the SWD of SC-LDPC codes has a better performance over Rayleigh fading channels,and the performance of the proposed algorithm is significantly better than that of the traditional SWD algorithm.

关 键 词：空间耦合低密度奇偶校验码 瑞利衰落信道 滑窗译码 

分 类 号：TN911.22[电子电信—通信与信息系统]