低压电力线通信自适应脉冲噪声抑制

Adaptive Mitigation of Impulsive Noise in Low-voltage Power Line Communication

针对脉冲噪声严重影响电力线通信系统传输性能,提出一种室内电器脉冲噪声估计和抑制方法。首先,分析室内脉冲噪声的特性,在通信过程中对传输信号进行交织操作。然后,在接收端利用矩估计的方法对脉冲噪声的特征参数进行估计,根据估计的脉冲噪声信息建立噪声抑制的自适应门限。最后,根据自适应门限对电力线脉冲噪声进行抑制。仿真结果表明,所提算法在未知脉冲噪声特征情况下,能对接收信号中的脉冲噪声进行可靠估计,对电力线脉冲噪声能够进行自适应抑制,并且该算法的噪声抑制性能优于传统的限幅和消隐抑制算法。

Considering the problem that impulsive noise(IN)seriously affects the transmission performance of a power line communication system,an estimation and mitigation method for indoor electrical IN is proposed in this paper.First,the characteristics of indoor IN are analyzed,and the transmitted signal is interleaved in the communication process.Second,the characteristic parameters of IN are estimated at the receiver using the method of moment estimation,and an adaptive threshold for noise mitigation is established according to the estimated information of IN.Finally,the IN in the power line is mitigated according to the adaptive threshold.Simulation results show that the proposed algorithm can reliably estimate the IN contained in the received signal in the case of unknown characteristics of IN,and it can mitigate the IN in the power line adaptively.It is concluded that the noise mitigation performance of the proposed algorithm is superior to those of the traditional algorithms which use clipping and blanking methods.