光学与光电技术, 2016, 14 (2): 70, 网络出版: 2016-05-11   

一种基于恒模算法改进的光相位均衡技术

Optical Phase Equalization Technology Based on Improved Constant Modulus Algorithm
作者单位
西安工程大学电子信息学院, 陕西 西安 710048
摘要
传统恒模盲均衡技术由于在信号相位均衡中采用固定步长,致使相位点的收敛速度和收敛精度之间相互制约,其应用范围受到很大的限制。为使接收到的信号恢复效果达到最佳,对传统算法进行了改进,提出了一种以均方误差为判决依据,用时变步长代替固定步长的恒模盲均衡算法,同时对两种算法的均方误差曲线进行比较分析。实验结果表明,随着迭代次数的增加,改进算法恢复的星座图中相位点的收敛速度是原始算法的3倍,其迭代次数在2 000点以后便趋于稳定,使得相位之间的误差减少,信号的恢复效果明显。
Abstract
Traditional constant modulus blind equalization technology adoptes fixed step length in the signal phase equilibrium, which makes the mutual restriction of phase between convergence speed and convergence accuracy, so that its application is limited. In order to make the received signal recovery achieve the best effect, the traditional algorithm is improved in this paper, and a kind of constant modulus blind equalization algorithm is put forward based on time-varying step size instead of fixed step length. The MSE curves of the two algorithms are compared as well. The experimental results show that the convergence speed of the improved algorithm to recover the constellation phase point is 3 times of the original algorithm with the increase in the number of iterations. The iterations after 2 000 points will tend to be stable that makes the phase error reduce. The signal recovered effect is obvious.

关浩, 朱耀麟. 一种基于恒模算法改进的光相位均衡技术[J]. 光学与光电技术, 2016, 14(2): 70. GUAN Hao, ZHU Yao-lin. Optical Phase Equalization Technology Based on Improved Constant Modulus Algorithm[J]. OPTICS & OPTOELECTRONIC TECHNOLOGY, 2016, 14(2): 70.

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