Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (2): 101-105,131.doi: 10.3969/j.issn.1000-565X.2010.02.019

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Performance of Cognitive Radio Networks with Different Packet Level Policies

Zhang Min 1  Wei Gang 1  He Chun-xiong 2  Wang Hong-jiang 1   

  1. 1 School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Department of Mathematics, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-03-05 Revised:2009-05-13 Online:2010-02-25 Published:2010-02-25
  • Contact: 张敏（1983-），女，博士生，主要从事认知无线电网络研究． E-mail:aries．zm@grnail．com
  • About author:张敏（1983-），女，博士生，主要从事认知无线电网络研究．
  • Supported by:

    国家杰出青年科学基金资助项目（60625101）;国家“863”计划项目（2007AA01Z210）;广东省自然科学基金资助项目（07006488）

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Abstract:

In this paper, the performances of cognitive radio networks with different packet level policies for secondary users are analyzed, and two models for cognitive radio networks are proposed to derive the formulas of packet loss ratio, packet delay, throughput and spectrum utilization for secondary users. Moreover, a performance simulation is carried out to evaluate the accuracy of the proposed theoretical models. Analysis and simulation results indicate that （ 1 ） the proposed models can accurately evaluate the performance of cognitive radio networks ; （2） the packet loss ratio, packet delay and spectrum utilization of secondary users all increase with the arrival rates of services; （3） cognitive radio networks help to improve the spectrum utilization remarkably; and （4） the difference in packet level policy of secondary users affects the spectrum utilization slightly but it exerts significant effects on the throughput.

Key words: cognitive radio network, Markov model, packet level policy