Multipath

Multipath

For wireless facilities where there is a relatively free choice of where antennas are
to be located, they can be placed so that if there are no nearby interfering obstacles,
there is a direct line-of-sight path from transmitter to receiver. This is generally
the case for many satellite facilities and for point-to-point microwave.Xn other
cases, such as mobile telephony, there are obstacles in abundance. The signal can
be reflected by such obstacles so that multiple copies of the signal with varying
delays can be received. In fact, in extreme cases, the receiver my capture only
reflected signals and not the direct signal. Depending on the differences in the
path lengths of the direct and reflected waves, the composite signal can be either