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Threshold-based design of quantized decoder for LDPC codes

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4 Author(s)
Yu-Cheng He ; Nat. Key Lab. of ISN, Xidian Univ., Xi''an, China ; Hong-Pei Li ; Shao-Hui Sun ; Lei Li

The effects of quantization on the sum-product (SP) algorithm for iteratively decoding low-density parity-check (LDPC) codes are investigated. Two threshold-based designs of the quantized sum-product (Q-SP) algorithm are presented together with the results of the 4-bit decoding for several known regular codes over the additive white Gaussian noise channel. Nonuniform quantization can significantly improve the Q-SP decoding performance without increase in implementation complexity.

Published in:

Information Theory, 2003. Proceedings. IEEE International Symposium on

Date of Conference:

29 June-4 July 2003