Abstract

Through location awareness, cognitive radio systems can establish a scanning-free region where coexistence with a primary network is possible. Exploiting the power control capability of cognitive radio devices can expand this region, improving the system throughput. In this paper we investigate the impact of power control on the concurrent transmission probability. A new analytical model is proposed that allows to estimate the resulting expanded region when power adjustment is made between known limits. Computer simulations show that employing the proposed method the system performance is significantly improved compared to conventional fixed transmission power allocation.