Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (1): 44-48.doi: 10.3969/j.issn.1000-565X.2010.01.009

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

Anti-Jamming System for Cognitive Radio Based on Fractional Fourier Transform

Liu Xin  Tan Xue-zhi   

  1. Communication Research Center, Harbin Institute of Technology, Harbin 150080, Heilongjiang, China
  • Received:2008-12-16 Revised:2009-03-23 Online:2010-01-25 Published:2010-01-25
  • Contact: 刘鑫（1984-），男，博士生，主要从事认知无线电研究． E-mail:liuxinstar1984@sohu.com
  • About author:刘鑫（1984-），男，博士生，主要从事认知无线电研究．
  • Supported by:

    国家“863”计划项目(2008AA12Z305)

PDF

929

Abstract:

As the confliction between two cognitive radio （CR） systems and the interference among authorized users may degrade the performance of CR systems, an anti-jamming system for CR based on fractional Fourier transform （FrFT） is proposed. In this system, Chirp signal whose energy concentrates in FrFF domain is used as the base-band signal of CR, and the original data are restored via the filtering in FrFT domain and some correlative calculations. Simulated results show that the proposed system can extract the energy of expected signals and effectively suppress muhipath interference and the interference of other cognitive users, and that, when the interference is a cosine signal, bit error rate of the proposed system is lower than that of the system without FrFT.

Key words: cognitive radio, fractional Fourier transform, interference suppression, spectrum hole, bit error rate