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Frequency Fading: Fading describes the variation of the total pathloss (à signal level) when receiver/transmitter moves in the cell coverage area. Fading is commonly categorized to two categories based on the phenomena causing it. ? Slow fading: Caused by shadowing because of obstacles ? Fast fading: Caused by multipath propagation –Time-selective fading: Short delay + Doppler –Frequency-selective fading: Long delay –Space-selective fading: Large angle
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