计算机应用 ›› 2012, Vol. 32 ›› Issue (03): 783-786.DOI: 10.3724/SP.J.1087.2012.00783

• 网络与通信 • 上一篇    下一篇

新的混合型盲均衡算法

耿天玉,舒勤,应大力   

  1. 四川大学 电气信息学院,成都 610065
  • 收稿日期:2011-09-01 修回日期:2011-11-06 发布日期:2012-03-01 出版日期:2012-03-01
  • 通讯作者: 耿天玉
  • 作者简介:耿天玉(1986-),男,河北衡水人,硕士研究生,主要研究方向:现代信号处理;舒勤(1958-),男,重庆人,教授,博士,主要研究方向:现代信号处理、盲信号处理、计算机网络;应大力(1982-),男,重庆人,讲师,硕士,主要研究方向:通信信号处理。

New mixed blind equalization algorithm

GENG Tian-yu,SHU Qin,YING DA-li   

  1. School of Electrical Engineering and Information Technology, Sichuan University, Chengdu Sichuan 610065, China
  • Received:2011-09-01 Revised:2011-11-06 Online:2012-03-01 Published:2012-03-01

摘要: 针对恒模算法(CMA)仅适用于模值为常数的信号,对高阶QAM信号的均衡效果差这一问题,结合CMA与判决引导(DD)算法各自的优点,提出一种CMA与DD算法相结合的改进混合型算法。在算法初期,利用CMA+DD并行算法使系统眼图睁开;然后,再转换到DD算法来进一步减小剩余误差。仿真结果表明,采用新算法对高阶信号均衡有较快的收敛速度和较小的剩余误差,星座图恢复很紧凑,并且改进算法能修正相位和跟踪信道。

关键词: 恒模算法, 判决引导算法, 混合型算法, 均方误差, 高阶QAM信号

Abstract: Constant Modulus Algorithm (CMA) is only suited to balance the signals with modulus of the same value, but not suited to balance the high-order Quadrature Amplitude Modulation (QAM) signals. Combined with the virtues of CMA and Decision-Directed (DD) algorithm, an improved mixed blind equalization algorithm had been presented. First, the improved algorithm would make the system eye open using the CMA+DD parallel algorithm, and then switch to the DD algorithm to further reduce the residual error. The simulation results indicate that the improved algorithm has a very fast convergence speed, as well as a very small residual error for high-order QAM signals, and constellation recovery plan is very tight. Meanwhile, the improved algorithm can correct phase, and trace channel.

Key words: Constant Modulus Algorithm (CMA), Decision-Directed (DD) algorithm, mixed algorithm, Mean Square Error (MSE), high-order Quadrature Amplitude Modulation (QAM) signal

中图分类号: