JPL's Wireless Communication Reference Website

Chapter: Analog and Digital Transmission.

Diversity Reception

A signal transmitted at a particular carrier frequency and at a particular instant of time may be received in a multipath null. Diversity reception reduces the probability of occurrence of communication failures (outages) caused by fades by combining several copies of the same message received over different channels. In general, the efficiency of the diversity techniques reduces if the signal fading is correlated at different branches.

Figure: L-branch antenna diversity receiver (L = 5)

Methods for obtaining multiple replicas

Selection Methods

Various techniques are known to combine the signals from multiple diversity branches.

Video and Slide Show

Signal Processing for diversity reception
How to combine the the signals received via multiple antennas?

JPL's Wireless Communication Reference Website 1993, 1995.