Adaptive Extrinsic Information Scaling for Concatenated Zigzag Codes Based on Max-Log-APP

Hao ZHENG  Xingan XU  Changwei LV  Yuanfang SHANG  Guodong WANG  Chunlin JI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E101-A   No.3   pp.627-631
Publication Date: 2018/03/01
Online ISSN: 1745-1337
Type of Manuscript: LETTER
Category: Coding Theory
concatenated zigzag codes,  extrinsic information,  adaptive scaling,  iterative decoding,  

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Concatenated zigzag (CZ) codes are classified as one kind of parallel-concatenated codes with powerful performance and low complexity. This kind of codes has flexible implementation methods and a good application prospect. We propose a modified turbo-type decoder and adaptive extrinsic information scaling method based on the Max-Log-APP (MLA) algorithm, which can provide a performance improvement also under the relatively low decoding complexity. Simulation results show that the proposed method can effectively help the sub-optimal MLA algorithm to approach the optimal performance. Some contrasts with low-density parity-check (LDPC) codes are also presented in this paper.