Perhaps the most challenging technical problems facing communication system engineers are fading in a mobile environment. The term fading refers to the time variation of received signal power caused by changes in the transmission medium or paths. In a fixed environment, fading is affected by changes in atmosphere conditions, such as rainfall, but in a mobile environment, where one of the two antennas is moving relative to the other. The relative location of various obstacles charges over time creating complex transmission effects.
Types of fading:
1. Fast fading
2. Slow fading
3. Flat fading
4. Selective fading.
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