Question

Which among the following would result in increased out-of-band rejection at receivers while broadcasting?

(a) Periodic transmissions

(b) Increased transmission power

(c) Frequency reuse

(d) Close band spacing between stations

I have been asked this question in an interview for internship.

This key question is from Next Generation Wireless Network topic in division Next Generation Wireless Network of Cognitive Radio

Answer 1

Right option is (d) Close band spacing between stations

Explanation: The close band spacing between stations is a potential method for increasing the station density. However it causes increased out-of-band rejection at the receivers. Reduction of transmission and increased frequency reuse are other approaches for increasing station density. However these methods result in reduced coverage.