摘要
认知无线电之间的冲突或者授权用户的干扰会降低认知无线电系统的性能,为此,文中提出了采用分数傅里叶变换的认知无线电抗干扰系统,将在分数傅里叶变换域具有能量集中性的Chirp信号作为认知无线电的基带信号,接收端通过分数傅里叶变换域滤波和相关运算恢复出原始数据.仿真表明:文中的系统能够提取出有用信号的能量,当干扰为余弦信号时,要比未采用分数傅里叶变换的系统具有更低的误码率,而且还能够有效地抑制多径干扰和其他的多认知用户的干扰.
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.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第1期44-48,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
国家"863"计划项目(2008AA12Z305)
关键词
认知无线电
分数傅里叶变换
干扰抑制
频谱空穴
误码率
cognitive radio
fractional Fourier transform
interference suppression
spectrum hole
bit error rate
