In applications where more than one propagation path will exist, the
interaction of the signals from these multiple paths at the receiver (multipath
propagation) gives rise to significant distortion of the received data symbols.
The same source signal, arriving by a different route, will experience a different path
length and hence a different propagation delay. This difference in delay will result in
different phases between the two received signals. If the phase difference approaches 180o
then the signals will in fact partially cancel each other, while if the phase difference
approaches 0o they will reinforce.
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