PLC脉冲噪声下的选择性合并算法

Selective merge algorithm for PLC impulse noise

电力线信道中存在着幅值波动很大的脉冲噪声,这种噪声会扩散到频域所有的子载波上,严重影响接收端数据符号的判决。针对此问题提出了一种选择性合并算法,通过检测脉冲噪声出现的符号位置,只对没有受到脉冲干扰的符号进行合并。该算法利用了电力线系统的分集拷贝特性,虽然牺牲了一些分集增益,但性能上却有明显提升。仿真结果表明,即使在脉冲环境极其恶劣的情况下,所提合并算法也能达到很好的性能。

There exists impulse noise whose amplitudes fluctuate greatly in the power line channel.This noise will spread to all subcarriers in the frequency domain,seriously affecting the decision of the received data symbols.Aiming at this problem,this paper proposed a selective combining algorithm,which should only merge symbols that were not impaired by pulse interference after detecting the position of impulse noise.The algorithm utilized the diversity characteristics of power line systems,although some diversity gain was sacrificed,the performance had obvious improvement.The simulation results show that even in the case of extremely bad impulsive pulse environment,the proposed algorithm can also achieve good performance.