%0 Journal Article
%A CHU Qing-xin
%A SHI Xiang-qun
%T Interference Power Analyses of Delay-Constrained Cognitive Radio Systems
%D 2015
%R 10.13190/j.jbupt.2015.03.023
%J Journal of Beijing University of Posts and Telecommunications
%P 130-134
%V 38
%N 3
%X <p>To quantify the relationships between the queuing-delay bound at the secondary user and the interference power to the primary receiver caused by the secondary user, a power allocation scheme was proposed for cognitive radio systems. The scheme aims at minimizing an average interference power subject to a delay-bound quality-of-service(QoS) constraint. The closed-form expression for an average interference power was obtained in asymmetric Nakagami-<em>m</em> fading channels. Simulations show that there exists a tradeoff between interference power and the delay-bound constraint. It is also shown that diversity-based cognitive radio systems can significantly reduce the interference power, especially under stringent delay-bound constraint.</p>
%U https://journal.bupt.edu.cn/EN/10.13190/j.jbupt.2015.03.023