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Wireless Glossary


Multipath is the composition of a primary signal plus duplicate or echoed images caused by reflections of signals off objects between the transmitter and receiver. The receiver "hears" the primary signal sent directly from the transmission facility, but it also sees secondary signals that are bounced off nearby objects. These bounced signals will arrive at the receiver later than the incident signal. Because of this misalignment, the "out-of-phase" signals will cause intersymbol interference or distortion of the received signal. Although most of the multipath is caused by bounces of tall objects, multipath can also occur from bounces on low objects such as lakes and pavements.