电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2015年
7期
51-56
,共6页
电力线通信%低信噪比%噪声消除%经验模态分解%时频峰值滤波
電力線通信%低信譟比%譟聲消除%經驗模態分解%時頻峰值濾波
전력선통신%저신조비%조성소제%경험모태분해%시빈봉치려파
power line communication system%low SNR%noise mitigation%empirical mode decomposition%time frequency peak filter
针对电力线通信系统中，发射端与接收端之间存在大量噪声严重影响通信质量的情况，引用时频峰值滤波算法(Time-Frequency Peak Filtering, TFPF)作为噪声消除技术。考虑时频峰值滤波算法中窗长选择的严格限制，引用经验模态分解(Empirical Mode Decomposition, EMD)方法对TFPF进行改进。将信号分解为不同模态，在不同模态采用不同窗长进行TFPF滤波，以在信号保真和噪声压制方面得到更好的权衡。实验证明，相对原始TFPF，该方法具有更好的信号保真和噪声压制作用，可以有效地消除电力线通信系统噪声，降低误码率(BER)，提高通信质量。
針對電力線通信繫統中，髮射耑與接收耑之間存在大量譟聲嚴重影響通信質量的情況，引用時頻峰值濾波算法(Time-Frequency Peak Filtering, TFPF)作為譟聲消除技術。攷慮時頻峰值濾波算法中窗長選擇的嚴格限製，引用經驗模態分解(Empirical Mode Decomposition, EMD)方法對TFPF進行改進。將信號分解為不同模態，在不同模態採用不同窗長進行TFPF濾波，以在信號保真和譟聲壓製方麵得到更好的權衡。實驗證明，相對原始TFPF，該方法具有更好的信號保真和譟聲壓製作用，可以有效地消除電力線通信繫統譟聲，降低誤碼率(BER)，提高通信質量。
침대전력선통신계통중，발사단여접수단지간존재대량조성엄중영향통신질량적정황，인용시빈봉치려파산법(Time-Frequency Peak Filtering, TFPF)작위조성소제기술。고필시빈봉치려파산법중창장선택적엄격한제，인용경험모태분해(Empirical Mode Decomposition, EMD)방법대TFPF진행개진。장신호분해위불동모태，재불동모태채용불동창장진행TFPF려파，이재신호보진화조성압제방면득도경호적권형。실험증명，상대원시TFPF，해방법구유경호적신호보진화조성압제작용，가이유효지소제전력선통신계통조성，강저오마솔(BER)，제고통신질량。
In the power line communication system (PLC), large amount of noise exist between transmitter and receiver which seriously affects the reliability of the signal transmission. This paper presents a noise mitigation method based on time-frequency peak filtering (TFPF). However, there is a large restriction to TFPF by the selection of window length. In order to obtain the good trade-off between noise suppression and amplitude preservation, this paper adopts EMD method to assist TFPF. It utilizes the decomposition characteristic of EMD which can decompose a signal to a series of intrinsic mode functions (IMFs) from high frequency to low frequency and select different window length for these modes. Numerical experiments show that the EMD-TFPF method can effectively eliminate the power line communication system noise, reduce the Bit Error Rate (BER) and improve the quality of communication system. Moreover, it can make a better tradeoff between noise suppression and amplitude preservation. This work is supported by National Natural Science Foundation of China (No. 60972004).
