Optimization Algorithm for Impulsive Noise Mitigation Schemes of Middle-Voltage Distribution Line Communication Systems
中压配电线通信系统脉冲噪声处理的阈值优化算法

OFDM has received a considerable attention for realization of high-speed power line communications,and impulse noise is one of the main disturbances in power line. An optimization algorithm for impulsive noise mitigation in OFDM system is proposed based on the analysis of output SNR of blanking nonlinearity. Simulation results show that the proposed analysis provides very good prediction of the output SNR if the number of OFDM subcarriers is sufficiently large. For given impulsive index(A) ,there is a minimal optimum threshold. As the decrease of A,the minimal optimum threshold becomes larger. The output SNR and performance gain are functions of Signal to Impulsive Noise Ratio(SINR) respectively. Under lower and higher SINR,the output SNR changes linearly;and performance gain close to a fixed value respectively. But under middle SINR region,SNR and gain are nonlinear functions of SINR. The optimization algorithm proposed can improve the performance of impulse detection algorithm;furthermore,heighten the overall performance of the OFDM receiver in impulsive noise environment.