The phenomenon that the effect of the high frequencymodulation is better than that of the lowfrequencymodulation is explained, and general rules of choosing modulator parameters are also presented.
解释了高频调制效果比低频调制好的实验现象，并且给出了确定调制器参数的一般原则。
2
Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.
为克服低压电力线信道的频率选择性和时变性，系统采用正交多载波方式传输信息。
3
This thesis introduces a series of low cost high precision Linear FrequencyModulation Continuous Wave (LFMCW) ranging radar.