Acta Metallurgica Sinica(English letters) ›› 2015, Vol. 22 ›› Issue (3): 26-34.doi: 10.1016/S1005-8885(15)60649-5

• Wireless • Previous Articles     Next Articles

Energy efficiency optimization of cognitive relay network based on cooperative spectrum sensing

Song Yaolian, Zhang Fan, Shao Yubin, Long Hua   

  1. Faculty of Information Engineering and Automation, Kunming University of Science and Technology
  • Received:2014-08-26 Revised:2015-01-22 Online:2015-06-30 Published:2015-06-24
  • Contact: Song Yiaolian, E-mail:
  • Supported by:
    the National Science Fund under Grant No. 6087215, the Yunnan Research Program of Application Foundation under Grant No.2011FB035 and the School training fund under granted No.KKZ3201403010

Abstract: This paper focuses on the energy efficiency of cognitive relay (CR) networks with cooperative sensing, joint optimization of the sensing time and the signal-to-noise ratio (SNR) is studied to maximize the energy efficiency of CR network. Theoretical analysis shows that there exists an optimal sensing time and optimal SNR to make the energy efficiency maximized under a constraint of detection probability. Simulation results illustrate that the optimal fusion rule performs better than the OR rule and the AND rule in terms of the energy efficiency. By properly designing the fusion rule threshold as well as the number of cooperative sensing users, the energy efficiency of CR networks can be further improved.

Key words: cognitive radio network, cognitive relay network, energy efficiency, sensing time, fusion rule threshold, number of cooperative sensing users