一种估计多用户多径信号DOA的改进方法

A New Method for Estimating Multipath Signals DOA of Multiusers

Cardoso于 1 989年提出了一种盲源分离方法。本文将这种方法加以推广 ,使其可以适用于阵元数多于用户数的情况。同时 ,本文还根据推广的 Cardoso方法计算出的方向矢量 ,利用前后向线性预测方法估计信号的到达角。该方法不但可以估计独立信号的到达角 ,而且可以对多径信号进行处理。此方法所能估计的信号个数要远远多于 MUSIC算法 ,计算量较 MUSIC算法少 ,而且本方法可以在较低的信噪比下估计出正确的结果。

Cardoso presented a blind source separation algorithm in 1989. This algorithm is generalized and is used when the number of array elements is great than the number of users. Based on the steering vector from the generalized Cardoso algorithm, the DOA information can be obtained by using the forward/backward linear prediction technique. The method cannot only estimate DOA of independent signals, but also proceed that of multipath signals. The method can obtain correct results when SNR is very low.