摘要
在进行电力线载波机单边带解调时,往往会遇到信道衰耗及解调载波与调制载波相位不同步的问题,这都会引起解调出来的信号出现增益偏差,文章介绍了一种通过二次自动增益控制(AGC)控制分别来解决信道衰耗和相位不同步问题的自动增益控制AGC方法,并分析了它的功能及对解调结果的影响。第一次AGC,解决相位不同步的问题;第二次AGC,解决信道衰减的问题。试验结果表明这种AGC方法比普通的AGC方法具有更高的准确性与稳定性。
In power line carrier SSB demodulation system, the problem of channel decay and phase asynchrony of carrier signal will cause the different gain of demodulated signal. This paper introduces a quadratic AGC control method, which respectively solves the problem of channel decay and phase asynchrony of carrier signal, and analyzes the performance of this method. The AGC of first time solves the problem of phase asynchrony of carrier; the AGC of second time solves the problem of channel attenuation. The result of the test shows quadratic AGC method is more exact and steadier than ordinary AGC method.
出处
《电力系统通信》
2005年第12期47-49,共3页
Telecommunications for Electric Power System
关键词
Goertzel
自动增益控制
电力线载波机
数字信号处理器
单边带
goertzel algorithm
Automatic Gain Control ( AGC )
Power Line Carrier ( PLC )
Digital Signal Processing (DSP)
Single Side Band