摘要
针对衰落环境下频谱利用率的提高,采用了一种基于接收信号自相关矩阵的特征值的检测方法。该方法基于随机矩阵理论,用最大最小特征值作为检验统计量来检测授权用户是否存在,从而改善频谱利用率。将随机产生的BPSK信号和捕获的DTV信号分别作为信号源在莱斯衰落信道下进行信号检测仿真。实验表明与传统能量检测方法的对比,该检测算法在莱斯衰落信道下具有良好的检测性能。
To improve spectrum utilization in fading environment,a method is adopted based on the eigenvalue of the autocorrelation matrix of the received signal.This method is based on the random matrix theory,using the ratio from the maximum eigenvalue to the minimum eigenvalue as the test statistic to detect the existence of primary users,so as to improve the spectrum efficiency.Simulations are made respectively based on the BPSK（Binary Phase Shift Keying）and the captured DTV（Digital Television）signals in the Rician fading channel.The results show that the performance of the adopted method is better than the energy detection method in the same fading environment.
出处
《无线电工程》
2012年第3期14-16,24,共4页
Radio Engineering
关键词
频谱利用率
特征值
莱斯衰落信道
检测性能
spectrum efficiency
eigenvalue
Rician fading channel
detection performance
