摘要
为了提高系统的误码率性能,减小码间干扰带来的影响,在修正常数模算法(MCMA)的基础上,提出了一种变步长的算法。该算法采用判决反馈滤波器的结构,根据星座点的收敛程度的不同而实时地调整步长,能显著提高系统的误码率性能,加快收敛速度,同时补偿信道的相位误差。对改进的算法进行计算机仿真,结果表明:该算法误码率性能良好,收敛后星座点紧簇且稳态误差较小,并且解决了常数模(CMA)算法无法解决的相位偏转问题。
For the sake of improving the p^rformance of BER of the communication system and reducing the impact of Intersymbol Interference （ISI）, we put forward a new algorithm with Variable Step-sizes （VSS） based on Modified Constant Modulus Algorithm （MCMA） .The algorithm uses Decision Feedback Equalization （DFE） structure and variable step-sizes which changes with the conver- gence of the constellations. It can improve significantly the performance of BER and the convergence speed and compensate the phase error of the system channel at the same time. The computer simulation results show that the improved algorithm has a good performance of BER,gathering constellations,small residual error and solves the problem of the phase rotation which can＇ t be solved by CMA.
出处
《无线电通信技术》
2014年第1期41-44,共4页
Radio Communications Technology
基金
国家部委基金资助项目
