Noise uncertainty study of the low SNR energy detector in cognitive radio

  • Authors:

  • Guoqing Ji;Hongbo Zhu

  • Affiliations:

  • Nanjing University of Posts and Telecommunications, Province Key Laboratory on Wireless Communicantion of Jiangsu, Nanjing, China;Nanjing University of Posts and Telecommunications, Province Key Laboratory on Wireless Communicantion of Jiangsu, Nanjing, China

  • Venue:
  • AICI'10 Proceedings of the 2010 international conference on Artificial intelligence and computational intelligence: Part I
  • Year:
  • 2010

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Abstract

It's well known that a signal-noise-ratio(SNR) threshold named "SNR wall"[5] appears in the energy detection due to the noise uncertainty. It makes energy detector(ED) highly non-robust in low SNR environment. In this paper, a log-normal distribution model of the noise power uncertainty is proposed. The detection performances of the energy detector are analyzed based on the proposed noise model. The numerical results illustrate that not only local but also cooperative low SNR Eds are reduced to invalid for a biggish noise power uncertainty.