Concatenated Spatially Coupled LDPC Codes With Sliding Window Decoding for Joint Source-Channel Coding

Ahmad Golmohammadi, David G. M. Mitchell

2021IEEE Transactions on Communications30 citationsDOI

Abstract

In this paper, a method for joint source-channel coding (JSCC) based on concatenated spatially coupled low-density parity-check (SC-LDPC) codes is investigated. A construction consisting of two SC-LDPC codes is proposed: one for source coding and the other for channel coding, with a joint belief propagation-based decoder. Also, a novel windowed decoding (WD) scheme is presented with significantly reduced latency and complexity requirements. The asymptotic behavior for various graph node degrees is analyzed using a protograph-based Extrinsic Information Transfer (EXIT) chart analysis for both LDPC block codes with block decoding and for SC-LDPC codes with the WD scheme, showing robust performance for concatenated SC-LDPC codes. Simulation results show a notable performance improvement compared to existing state-of-the-art JSCC schemes based on LDPC codes with comparable latency and complexity constraints.

Topics & Concepts

Low-density parity-check codeConcatenated error correction codeSerial concatenated convolutional codesComputer scienceAlgorithmBlock codeDecoding methodsTurbo codeTheoretical computer scienceForward error correctionEXIT chartSliding window protocolOperating systemWindow (computing)Error Correcting Code TechniquesCooperative Communication and Network CodingAdvanced Wireless Communication Techniques