Question

Which among the following is not a prerequisite for cooperative sensing?

(a) Non-corrupt neighbouring radios

(b) Knowledge of spectrum environment

(c) Knowledge of limits of transmission parameters

(d) Central entity

The question was posed to me in an internship interview.

The above asked question is from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct choice is (d) Central entity

Easiest explanation: Cooperative spectrum sharing involves sharing spectrum usage and noise information to other nodes of the spectrum. This mode considers the operation of other spectrum users thus raising the overall spectrum efficiency of the network. It requires non-corrupt neighbouring radios, knowledge of spectrum environment, understanding of limits imposed on transmission parameters, and transparent sharing of spectrum information by transmitters.