Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2015, Vol. 38 ›› Issue (3): 130-134.doi: 10.13190/j.jbupt.2015.03.023

• Reports • Previous Articles    

Interference Power Analyses of Delay-Constrained Cognitive Radio Systems

SHI Xiang-qun1, CHU Qing-xin2   

  1. 1. School of Electronic and Information Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Guangdong Zhongshan 528402, China;
    2. School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China
  • Received:2014-08-04 Online:2015-06-28 Published:2015-06-26

Abstract:

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-m 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.

Key words: cognitive radio, effective capacity, delay quality-of-service, power control, Nakagami-m fading

CLC Number: