动态反馈多载波光通信非线性失真抑制算法

Nonlinearity Distortion Algorithm for Multicarrier Optical Communication Systems Based on Dynamic Feedback

针对多载波光通信系统中多载波峰值平均功率比较大,导致放大器非线性失真严重的问题,提出一种基于动态反馈的多载波光通信非线性失真抑制算法。该算法采用部分传输序列对子信道的载波相位优化以降低峰值平均功率比发生概率,并对多载波信号噪声进行压扩限幅,接收端采用最大似然准则估算误码率最低部分传输序列相位加权系数,并将该相位加权系数反馈到发送端进行动态补偿,最大程度降低限幅噪声。性能分析和仿真结果表明,与概率类算法相比,该算法有效抑制峰值平均功效比非线性失真与限幅噪声,并降低了系统误码率。

According to the multi carrier wave communication system in multi carrier peak to average power is relatively large leads to serious problems of nonlinear distortion amplifier, this paper puts forward a dynamic feedback multi carrier optical communication based on nonlinear distortion suppression algorithm. The algorithm uses the carrier phase optimization of partial transmit sequence on channel to reduce the peak to average power ratio probability, and the multi carrier signal companding limiting, the receiving end criterion of maximum likelihood estimation minimum bit error rate of the partial transmit sequence phase weighting coefficient, and feedback of the phase weighting coefficient to the sending end of dynamic compensation, the maximum degree reduce the clipping noise. Performance analysis and simulation results show that,compared with the probability method, the algorithm can effectively inhibit the peak to average power ratio of nonlinear distortion and the clipping noise, and reduce the system bit error rate.