分组衰落信道下LDPC的一种带信道估计的改进Belief-Propagation算法  

An Improved Belief-Propagation Algorithm with Channel Estimation of LDPC under Block Fading Channels

作　　者：邓建民[1] 尹长川[1] 纪红[1] 乐光新[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《电子与信息学报》2005年第4期519-522,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60172052)国家自然科学基金重大研究计划(90104018)资助课题

摘　　要：该文首先通过仿真证明了LDPC(Low Density Parity Check code)在分组衰落信道下,以通常的 Belief-propagation算法译码,具有较好性能。然后基于算法的特殊迭代特性,提出分组衰落信道下,在每一迭代步 骤中结合信道估计的改进的Belief-propagation算法。仿真证明,该算法可以有效地减少译码迭代次数。Firstly it is proved by simulation that the Low Density Parity Check(LDPC) code has sound performance under block fading channel when decoded by general belief-propagation algorithm. Then based on its special iterative nature, the improved belif-propagation algorithm is proposed under block fading channel with channel estimation in every iterative step. The simulation demonstrates that the proposed algorithm can effectively reduce the iterative times of decoding.

关 键 词：LDPC 信道估计 改进的Belief-propagation算法 

分 类 号：TN911.23[电子电信—通信与信息系统]