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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 7    July 2015

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Optimization of sensing time and cooperative user allocation for or-rule cooperative spectrum sensing in cognitive radio network
LIU Xin(刘鑫), ZHONG Wei-zhi(仲伟志), CHEN Kun-qi(陈琨奇)

College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Abstract:In order to improve the throughput of cognitive radio (CR), optimization of sensing time and cooperative user allocation for OR-rule cooperative spectrum sensing was investigated in a CR network that includes multiple users and one fusion center. The frame structure of cooperative spectrum sensing was divided into multiple transmission time slots and one sensing time slot consisting of local energy detection and cooperative overhead. An optimization problem was formulated to maximize the throughput of CR network, subject to the constraints of both false alarm probability and detection probability. A joint optimization algorithm of sensing time and number of users was proposed to solve this optimization problem with low time complexity. An allocation algorithm of cooperative users was proposed to preferentially allocate the users to the channels with high utilization probability. The simulation results show that the significant improvement on the throughput can be achieved through the proposed joint optimization and allocation algorithms.

 

Key words: cognitive radio; energy detection; cooperative spectrum sensing; throughput; optimization

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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