基于循环平稳的多天线感知无线电频谱检测

Cyclostationarity-Based Spectrum Sensing Technique in Multi-Antenna Cognitive Radio

为了利用多天线的空间分集,提高感知无线电频谱检测性能,提出了基于循环平稳特性的多天线合并频谱检测方法,首先从各天线接收信号的谱相关函数中提取信道频域响应的信息,在频域合并各天线的接收信号;然后对合并信号进行频谱检测.理论分析和仿真结果表明,该方法能充分利用多天线系统的空间分集,提高频谱检测的性能.

A multi-antenna spectrum sensing technique based on cyclostationary characters was proposed to improve the sensing performance in cognitive radio. After estimating the channel frequency response from the spectral correlation function （SCF） of each antenna, the new method combines the multiple antenna signals in frequency domain to detect the spectrum of combined signal. The closedform expression for the signal noise ratio （SNR） of combined signal＇s SCF and simulation results show that the technique is capable of achieving full spatial diversity in spectrum sensing.