基于压扩变换的电力线通信系统脉冲噪声抑制

Impulse noise suppression of power line communication system based on companding transform

针对电力线通信系统高负荷期急变脉冲噪声抑制问题,提出了一种基于压扩变换的噪声抑制方法。该方法在发射端对通信信号进行压扩变换,压缩和扩展信号幅值,改善信号峰均功率比性能;接收端首先利用压扩峰值估计噪声脉冲概率,然后对接收信号进行消隐降噪处理,最后再通过硬反馈判决进一步去除残留脉冲噪声。仿真结果表明,提出算法具有较高的噪声脉冲检测概率,能够有效去除电力线通信系统的脉冲噪声,对于高负荷期急变脉冲噪声具有良好抑制性能,降低了系统通信误码率。

Regarding the problem of impulse noise suppression in power line communication system during high load period,a noise suppression method based on companding transform is proposed.In this method,the communication signal is compressed and transformed at the transmitter.The peak to average power ratio(PAPR)performance is improved by compressing and expanding the signal amplitude.The receiver first estimates the probability of noise pulse by using the peak value of companding.Then,the received signal is processed by blanking and noise reduction.Finally,the residual impulse noise is further removed by rigid feedback decision.The simulation results show that the proposed algorithm has a high probability of noise pulse detection which can effectively remove the impulse noise of power line communication system,and has a good suppression performance for the sudden change impulse noise in high load period.The system communication error rate is reduced.