Multipath is the arrival of a transmitted signal at a receive antenna from multiple paths due to
reflections. The reflections can occur from the ground, trees, buildings, people, or whatever is around.
As an example, see Figure 1. The dominant signal is often the Line of Sight (LOS) signal, which
is the direct path from the receiver to the transmitter. The other arriving signals (due to reflections)
are known as multipath. In some situations (particularly in urban environments), there is no line of sight
signal, and all received rays are from multipath. Multipath causes significant variation in received
signal - sometimes the multipath reinforces the received signal, but often it subtracts from it (a phenomenon known
as fading). See also
Figure 1. Example of multipath.
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