On the throughput maximization of Cognitive Radio using cooperative spectrum sensing over erroneous control channel

Abstract

In this paper, we consider optimization of number of secondary users (M) by maximizing average channel throughput of the cognitive radio (CR) network for a given fusion rule (k-out-of-M) at the fusion center (FC) over erroneous control channel. For a given arbitrary positive integer value n, we obtain the mathematical expressions for optimal M for k = 1 + n and k = M - n rules at FC. Considering energy detector as an example for the analysis, following observations are made: 1) In the interval n ∈ [0, ⌈M/2⌉ - 1], as n increases optimal M increases. If FC uses k = 1 + n or k = M - n fusion rule, average channel throughput improves as n increases. 2) For a given n, average channel throughput obtained using k = M - n fusion rule is better compared to k = 1 + n fusion rule.