一种提高SCCPM系统迭代检测收敛性的方法
doi: 10.3724/SP.J.1146.2005.01579
A Method to Improve the Iterative Detection Convergence of SCCPM
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摘要: 该文运用动力学原理对串行级联连续相位调制系统(SCCPM)迭代检测过程中存在的正反馈现象进行了分析，从正反馈的减少和检测两方面对迭代方法进行了改进。提出了一种加权外信息交换的迭代方法，有效改善了系统收敛的程度。设计了基于硬判决符号改变的动态迭代方法，在减少平均迭代次数的同时，能够通过对残存正反馈的检测来选择较小错误数的迭代。仿真结果表明所提出的改进方法能有效抑制SCCPM系统中存在的正反馈现象，提高系统性能。
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关键词:
- 连续相位调制;代方法;收敛性;信息
Abstract: Convergence of Serially Concatenated Continuous Phase Modulation (SCCPM) is studied. Based on the theory of dynamic system, phenomena of positive feedback during iterative detection are analyzed, and improved methods are proposed from the views of decrease and detection of positive feedback. An iterative method based on weighed extrinsic information exchange is proposed, which can improve the convergence of SCCPM effectively. A dynamic iterative method based on the number of change of hard decision is designed; which can detect the positive feedback as well as reduce the average number of iteration. Simulation results show the proposed methods can decrease positive feedback and improve the performance of SCCPM effectively. -
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