南京邮电大学学报（自然科学版）2017，Vol.37Issue(2)：1-8,8.DOI:10.14132/j.cnki.1673-5439.2017.02.001
阈值系统中的LDPC译码随机共振及应用研究
Stochastic resonance of LDPC code decoding and application in threshold system
摘要
Abstract
The effects of stochastic resonance (SR) of low density parity check (LDPC) code decoding in the threshold array system are studied The source array coded by LDPC adds independent identically distributed Gauss noise through threshold array system.At the receiving end a BP iterative decoding algorithm is used and a bit error ratio is used as measurement.The simulation results demonstrate that when the signal is subthreshold,the bit error ratio firstly declines and then rises,as the noise intensity increases,showing the SR does exits.Especially,when the number of threshold devices is larger,SR is obvious.However,when the signal is suprathreshold,the noise cannot improve the decoding performance,SR does not occur in this case.The improving effects of LDPC decoding performance on the threshold array system under rice noise are studied and the existence of supra-threshold stochastic resonance (SSR) is confirmed.Finally,the noise effects on the transmission performance of the image in the LDPC coding and decoding system are studied.Results show that the improving noise effects on nonlinear system channel decoding can expand the application of SR in the channel decoding.关键词
随机共振/阈上随机共振/阈值阵列系统/LDPC码/噪声Key words
stochastic resonance (SR)/supra-threshold stochastic resonance (SSR)/threshold array system/low density parity check (LDPC) code/noise分类
信息技术与安全科学引用本文复制引用
王友国,李冰,翟其清..阈值系统中的LDPC译码随机共振及应用研究[J].南京邮电大学学报（自然科学版）,2017,37(2):1-8,8.基金项目
国家自然科学基金(61179027)和江苏省“青蓝工程”基金(QL06212006)资助项目 （61179027）
