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A robust approach to optimum widely linear MVDR beamformer

机译：一种最佳的广泛线性MVDR波束形成器的鲁棒方法

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摘要

In many array processing, the received signals are nonstationary, or in particular, noncircular. Widely linear minimum variance distortionless response (WL MVDR) beamformers can exploit the noncircularity of received signals and improve the performance of the conventional MVDR beamformer. However, in the optimum WL MVDR beamformer, the array steering vector (ASV) and the signal noncircularity coefficient should be known a priori for the signal of interest. This requirement puts strict limitation to the implementation of this beamformer. We therefore in this paper propose a robust approach to the optimal WL MVDR beamformer that can deal with the uncertainties in the ASV and noncircularity coefficient. Two variants of the proposed approach are developed based on the treatment of the uncertainties. By doing so, the requirement on the exact information is relaxed while the performance improvement can still be obtained. Simulation studies are also provided to illustrate the performance of the proposed approach.
机译：在许多阵列处理中，所接收的信号是非间断的，或者特别是非频率。广泛的线性最小方差无失真响应（WL MVDR）波束形成器可以利用接收信号的非功能性，提高传统MVDR波束形成器的性能。然而，在最佳WL MVDR波束形成器中，应当知道阵列转向矢量（ASV）和信号非循环系距，以获得感兴趣的信号的先验。这一要求对该波束形成器的实施进行了严格的限制。因此，我们本文提出了一种稳健的方法，可以实现最佳的WL MVDR波束形成器，可以应对ASV和非圆形系数的不确定性。建议方法的两个变体是基于治疗不确定性的治疗。通过这样做，在仍然可以获得性能改进的同时放宽对确切信息的要求。还提供了模拟研究以说明所提出的方法的性能。

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