基于导频的光OFDM系统信道估计

Pilot-based Channel Estimation for Optical OFDM Systems

信道估计是光正交频分复用(OOFDM)系统关键技术之一,为了克服光纤色散和模式的传输时延所产生的载波间干扰(ICI),设计了一种基于导频的信道估计器,通过分析最小二乘(LS)和线性最小均方误差(LMMSE)算法估计原理,仿真实验比较两种算法的误比特率和均方误差性能,实验结果表明,LS与LMMSE在OOFDM系统中都有较好的作用,但LMMSE算法性能要优于LS算法。

Channel estimation is one of the key technologies in optic OFDM.In order to overcome ICI resulted from the fiber dispersion and the mode transmission delay,a Pilot-based channel estimator is designed,and the estimation principle of LS algorithm and LMMSE algorithm is analyzed.The simulation experiments and the comparison for bit error rate and mean square error performance of the two algorithms show that both LS and LMMSE in optical OFDM systems have a fairly good performance,but LMMSE algorithm performs better than LS algorithm.