摘要
电力线通信中面临低信噪比下信号检测的问题。文中将电力线通信最常见的调制信号—OFDM信号作为检测对象,分析了小波包变换的良好时频分析特性,根据OFDM信号与其他单载波信号具有不同的小波包分解特性,引入利用MATLAB平台对该模型进行仿真,仿真结果表明该检测方法可以在低信噪比情况下实现OFDM信号的检测,体现了小波包变换应用于电力线通信信号检测中的优越性。
Aiming at the problem of signal detection in low signal-to-noise ratio in power line communication,the paper takes the most common modulation signal in power line communication— OFDM signal as detection object,and analyzes the favorable time-frequency analysis characteristics of wavelet packet transform.In the power line noise channel,according to the different wavelet packet decomposition characteristics of OFDM signal with the other single carrier signal,a detection method of OFDM signal based on wavelet packet transform is proposed by taking maximum value of wavelet packet decomposition coefficient norm two as detection characteristic quantity.The simulation results got by MATLAB show that this detection method can detect the OFDM signal in low signal-to-noise ratio,and reflect advantages of the wavelet packet transform applying to the power line communication.
出处
《电子测量技术》
2015年第12期111-115,共5页
Electronic Measurement Technology
