Question

Which among of the following may be employed to synchronise base station to local reference station?

(a) Two signals of different frequency

(b) Two signals of different phase

(c) Four signals of different frequency

(d) Four signals of different phase

I had been asked this question in an internship interview.

My question is from Environment Awareness topic in portion Location and Environment Awareness in Cognitive Radio of Cognitive Radio

Answer 1

Correct choice is (a) Two signals of different frequency

The best explanation: Synchronisation between base station and local reference station may be achieved by using accurate synchronous clocks, employing two signals of different frequency, or through measurement to or triggering from a common reference point.