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针对于在低信噪比环境，underlay 频谱共享方式下时频重叠信号的信号分量个数估计性能低的问题，提出了一种underlay频谱共享方式下时频重叠信号的信号分量个数的估计新方法，该方法首先利用动态延时构造出虚拟阵列信号，然后利用噪声奇异值变化不大的特点构造特征量和估计准则，从而估计出underlay频谱共享方式下时频重叠信号的信号分量个数。仿真结果表明，所提方法在低信噪比和高频谱重叠率条件下，比现有方法的估计性能更好。
Aiming at the problem of low estimation performance of the number of signal components of time-frequency overlap signal under low signal-to-noise ratio (SNR) environment and underlay frequency spectrum sharing method, an estimate of the number of signal components of time-frequency overlap signal under underlay spectrum sharing is proposed The method firstly constructs the virtual array signal by using dynamic delay and then constructs the feature quantity and the estimation criterion by using the feature that the variation of the singular value of noise is small, so as to estimate the number of signal components of the time-frequency overlapping signal in underlay spectrum sharing mode. Simulation results show that the proposed method has better estimation performance than the existing methods at low SNR and high spectral overlap rate.