摘要
针对串行级联连续相位调制系统(SCCPM)存在正反馈的问题,提出了一种基于平均外信息交换的迭代停止译码算法.该算法采用平均外信息交换方法,将历次迭代外信息的平均值作为下次迭代的先验信息,并结合符号改变率(SCR)和辅助硬判决(HDA)两种迭代停止准则进行迭代译码.仿真结果表明,平均外信息交换与动态迭代停止算法相结合可以有效抑制正反馈,提高SCCPM系统性能,并且能够减少译码时延.
In order to decrease the positive feedback of the Serially Concatenated Continuous Phase Modulation （SCCPM）, a new stopping algorithm for iterative decoding based on the average extrinsic information exchange is proposed. The algorithm uses the method for average extrinsic information exchange, which makes the mean of extrinsic information of all previous iterations a priori information for the next iteration, and then it performs decoding with two stopping criterions of dynamic iterative decoding： Sign Change Ratio （SCR） and Hard Decision-Aided （HDA）. Simulation result shows that the proposed algorithm with dynamic iterative stopping criteria can resist the positive feedback and improve BER performance as well as reduce the iterative decoding delay.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第4期716-720,748,共6页
Journal of Xidian University
基金
国家自然科学基金重点项目资助(60532060)
国家自然科学基金资助项目资助(60496316)
高等学校优秀青年教师科研奖励计划资助(TRAPOYT)
高校博士点基金资助(20050701007)
关键词
连续相位调制
SCCPM
外信息交换
迭代译码
停止算法
continuous phase modulation
SCCPM
extrinsic information exchange
i terative decoding
stopping algorithm
