Question

The rule of thumb for antenna diversity states that for an antenna separation of 10 wavelengths or more, there is a considerable probability for the diversity signal to be substantially decorrelated from the primary signal.

(a) True

(b) False

This question was addressed to me in a job interview.

Origin of the question is Antenna Tradeoffs topic in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio

Answer 1

Right choice is (a) True

For explanation I would say: Doppler spread introduces decorrelation as a function of antenna separation.The rule of thumb for antenna diversity states that for an antenna separation of 10 wavelengths or more, there is a considerable probability for the diversity signal to be substantially decorrelated from the primary signal.