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On implementation of min-sum algorithm for decoding low-density parity-check (LDPC) codes

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2 Author(s)
Zarkeshvari, F. ; Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada ; Banihashemi, A.H.

This paper is concerned with the implementation issues of the so-called min-sum algorithm (also referred to as max-sum or max-product) for the decoding of low-density parity-check (LDPC) codes. The effects of clipping threshold and the number of quantization bits on the performance of the min-sum algorithm at short and intermediate block lengths are studied. It is shown that min-sum is robust against quantization effects, and in many cases, only four quantization bits suffices to obtain close to ideal performance. We also propose modifications to the min-sum algorithm that improve the performance by a few tenths of a dB with just a small increase in decoding complexity.

Published in:

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE  (Volume:2 )

Date of Conference:

17-21 Nov. 2002

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