Diversity scheme
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diversity reception: Radio reception in which a resultant signal is obtained by combining or selecting signals, from two or more independent sources, that have been modulated with identical information-bearing signals, but which may vary in their fading characteristics at any given instant.
Note 1: Diversity reception is used to minimize the effects of fading.
Note 2: The amount of received signal improvement when using diversity reception is directly dependent on the independence of the fading characteristics.
Source: from Federal Standard 1037C and from MIL-STD-188