Spatially Coupled Codes via Bidirectional Block Markov Superposition Transmission  

作　　者：Gaoyan Li Shancheng Zhao Haiqiang Chen Jinming Wen 

机构地区：[1]College of Information Science and Technology,Jinan University,Guangzhou 510632,China [2]Guangxi Key Laboratory of Multimedia Communications and Network Technology,Guangxi University,Nanning 530004,China

出　　处：《Tsinghua Science and Technology》2024年第3期656-670,共15页清华大学学报（自然科学版（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62271233,12271215,and 62261003);the Basic Research Program of Guangzhou Municipal Science and Technology Bureau(No.202201020036);the Guangdong Provincial Natural Science Foundation(Nos.2022A1515010029 and 2021A1515011906).

摘　　要：In this paper,we present a new class of spatially coupled codes obtained by using both non-recursive and recursive block-oriented superposition.The resulting codes are termed as bidirectional block Markov superposition transmission(BiBMST)codes.Firstly,we perform an iterative decoding threshold analysis according to protograph-based extrinsic information transfer(PEXIT)charts for the BiBMST codes over the binary erasure channels(BECs).Secondly,we derive the generator and parity-check matrices of the BiBMST codes.Thirdly,extensive numerical results are presented to show the advantages of the proposed BiBMST codes.Particularly,our numerical results show that,under the constraint of an equal decoding latency,the BiBMST codes perform better than the recursive BMST(rBMST)codes.However,the simulation results show that,in finite-length regime,negligible performance gain is obtained by increasing the encoding memory.We solve this limitation by introducing partial superposition,and the resulting codes are termed as partially-connected BiBMST(PC-BiBMST)code.Analytical results have confirmed the advantages of the PC-BiBMST codes over the original BiBMST codes.We also present extensive simulation results to show the performance advantages of the PC-BiBMST codes over the spatially coupled low-density parity-check(SC-LDPC)codes,spatially coupled generalized LDPC(SC-GLDPC)codes,and the original BiBMST codes in the finite-length regime.

关 键 词：block Markov superposition transmission(BMST) protograph-based extrinsic information transfer(PEXIT) capacity-approaching codes spatial coupling 

分 类 号：U495[交通运输工程—交通运输规划与管理]