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首页> 外文期刊>Proceedings of the IEE - Part C: Monographs >Intermodulation distortion due to fading in frequency-modulation frequency-division multiplex trunk radio systems
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Intermodulation distortion due to fading in frequency-modulation frequency-division multiplex trunk radio systems

机译：调频频分复用干线无线电系统中由于衰落引起的互调失真

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Increased intermodulation distortion in frequency-modulation frequency-division multiplex trunk radio systems will be generated under fading conditions when the fade is due to the presence of one or more echoes. The distortion level is not simply related to the fading depth, but depends in a rather complicated way on the parameters of the echoes responsible for the fade. As a guide for future experimental work, theoretical investigation has been made of the nature of this dependence, both for single-echo and for multi-echo fading. In the latter case, a simple formula has been developed for the worst intermodulation distortion due to a system of echoes of given amplitudes and delay times. Numerical results are given for a particular 22.5 dB fade whose echo structure was derived experimentally.2 It is concluded that nothing can be deduced from measurements of fading depth alone about the magnitude of intermodulation distortion associated with fades generated by cancelling echoes. Measurements are required either of the parameters of the echoes or, directly, of the distortion.
机译：当衰落是由于一个或多个回波的存在而导致的衰落条件下，将在调频频分多路复用干线无线电系统中产生增加的互调失真。失真水平不仅与衰落深度有关，而且还以相当复杂的方式取决于引起衰落的回波参数。作为未来实验工作的指南，已经针对单回波和多回波衰落对这种依赖性的性质进行了理论研究。在后一种情况下，由于给定幅度和延迟时间的回波系统，为最坏的互调失真开发了一个简单的公式。给出了一个特定的22.5 dB衰落的数值结果，该衰落是通过实验得出的。2结论是，仅通过衰落深度的测量就无法得出与消除回声所产生的衰落相关的互调失真幅度的结论。需要回波参数或直接测量失真的参数。

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