Title :
Threshold-based design of quantized decoder for LDPC codes
Author :
He, Yu-Cheng ; Li, Hong-Pei ; Sun, Shao-Hui ; Li, Lei
Author_Institution :
Nat. Key Lab. of ISN, Xidian Univ., Xi´´an, China
fDate :
29 June-4 July 2003
Abstract :
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.
Keywords :
AWGN channels; iterative decoding; parity check codes; LDPC codes; additive white Gaussian noise channel; iteratively decoding; low-density parity-check codes; quantized decoder; sum-product algorithm; threshold-based design; Additive white noise; Algorithm design and analysis; Bit error rate; Helium; Iterative algorithms; Iterative decoding; Parity check codes; Performance evaluation; Performance loss; Quantization;
Conference_Titel :
Information Theory, 2003. Proceedings. IEEE International Symposium on
Print_ISBN :
0-7803-7728-1
DOI :
10.1109/ISIT.2003.1228163
