载波相位噪声对QPS K调制解调的影响是不可忽略的，也是难以分析的。
The effect on modulation and demodulation of QPSK via carrier phase noise can not be ignored, and it is difficult to analyze.
与传统的光学相位差放大方法相比，数字法相位差放大对实验装置要求较低，并且具有易于抑制噪声、载波因子可调等优点。
The method does not need an excellent test setup, and is more easy than conventional optics methods to restrain noise and adjust carrier parameter.
简要介绍了换流站换流阀的传导噪声的产生、传播方式以及对邻近的电力线载波通道的影响。
This article briefly introduces the produce of transmitting noise caused by converter valves, noise propagation mode, and its affection to adjacent power line carrier channels.
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