TITLE:
A Novel Cooperative Spectrum Sharing Algorithm Based on Optimal Cognitive Radio User Selection
AUTHORS:
Mohammad Bigdeli, Bahman Abolhassani
KEYWORDS:
Cognitive Radio Network (CRN); Spectrum Sharing; Spectrum Pool; Principle of Optimality
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.5 No.1,
December
31,
2011
ABSTRACT: In this paper, we consider the problem of cognitive radio (CR) user selection to maximize overall CR network (CRN) throughput when the available spectrum bandwidth is less than the demand by all CR users. We formulate optimal CR user selection problem. Then, based on approximation of the average received signal to interference plus noise ratio (SINR) and adaptive modulation and coding (AMC), we estimate the required bandwidth of CR users with different required quality of services (QoSs). Using the principle of optimality, we propose a novel cooperative spectrum sharing algorithm for a CRN. The proposed algorithm not only achieves exhaustive search performance but also its complexity is in the order of N × M versus 2N for exhaustive search, where N is the number of CR users, and M is the spectrum pool size. Extensive simulation results illustrate that the proposed algorithm significantly outperforms the existing algorithms that ignore optimal CR user selection. Also, these results illustrate a better fairness criterion than those of previous works.