標題: | Self-compensation technique for simplified belief-propagation algorithm |
作者: | Liao, Yen-Chin Lin, Chien-Ching Chang, Hsie-Chia Liu, Chih-Wei 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
關鍵字: | belief-propagation;dynamic normalization;iterative decoding;low-density parity-check (LDPC) codes;min-sum algorithm;self compensation |
公開日期: | 1-六月-2007 |
摘要: | The min-sum algorithm is the most common method to simplify the belief-propagation algorithm for decoding low-density parity-check (LDPC) codes. However, there exists a performance gap between the min-sum and belief-propagation algorithms due to nonlinear approximation. In this paper, a self-compensation technique using dynamic normalization is thus proposed to improve the approximation accuracy. The proposed scheme scales the min-sum algorithm by a dynamic factor that can be derived theoretically from order statistics. Moreover, applying the proposed technique to several LDPC codes for DVB-S2 system, the average signal-to-noise ratio degradation, which results from approximation inaccuracy and quantization error, is reduced to 0.2 dB. Not only does it enhance the error-correcting capability of the min-sum algorithm, but the proposed self-compensation technique also preserves a modest hardware cost. After realized with 0.13-mu m standard cell library, the dynamic normalization requires about 100 additional gates for each check,node unit in the min-sum algorithm. |
URI: | http://dx.doi.org/10.1109/TSP.2007.893976 http://hdl.handle.net/11536/10765 |
ISSN: | 1053-587X |
DOI: | 10.1109/TSP.2007.893976 |
期刊: | IEEE TRANSACTIONS ON SIGNAL PROCESSING |
Volume: | 55 |
Issue: | 6 |
起始頁: | 3061 |
結束頁: | 3072 |
顯示於類別: | 期刊論文 |