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A sampling-based approach to wideband interference cancellation

机译：基于采样的宽带干扰消除方法

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Classical adaptive array schemes which use only complex spatial weights are inherently narrowband and consequently perform poorly when attempting to suppress wideband interference. The common solution to this problem is the use of tapped delay line filters in each spatial channel to facilitate space-time adaptive processing (STAP). The higher performance provided by the STAP architecture comes at the cost of a considerable increase in complexity. This paper presents a simpler technique based on programmable time adjustable sampling (TAS) that provides a limited number of wideband degrees of freedom. Two TAS methods are introduced: TAS-sidelobe canceler (TAS-SLC) is based on the sidelobe canceler, while TAS-minimum variance beamformer (TAS-MVB) is derived from the minimum variance beamformer. TAS is implemented by adjusting the sampling instant at selected array channels. TAS-SLC consists of controlling the sampling in the main channel of the sidelobe canceler With TAS-MVB array complex weights are substituted with TAS time delays. The performance of TAS methods with wideband interference is compared to the conventional sidelobe canceler and minimum variance beamformers. It is shown that TAS-SLC provides better performance than the sidelobe canceler, while TAS-MVB outperforms the minimum variance beamformer.
机译：仅使用复杂空间权重的经典自适应阵列方案本质上是窄带的，因此在尝试抑制宽带干扰时性能较差。该问题的常见解决方案是在每个空间通道中使用抽头延迟线滤波器来促进空时自适应处理（STAP）。 STAP体系结构提供的更高性能是以复杂性显着增加为代价的。本文提出了一种基于可编程时间可调采样（TAS）的较简单技术，该技术可提供有限数量的宽带自由度。引入了两种TAS方法：TAS旁瓣消除器（TAS-SLC）基于旁瓣消除器，而TAS最小方差波束形成器（TAS-MVB）从最小方差波束形成器派生。通过调整选定阵列通道上的采样时刻来实现TAS。 TAS-SLC包括控制旁瓣抵消器主信道中的采样。使用TAS-MVB阵列时，复数权重被TAS时间延迟代替。将具有宽带干扰的TAS方法的性能与常规的旁瓣消除器和最小方差波束形成器进行比较。结果表明，TAS-SLC提供的性能优于旁瓣消除器，而TAS-MVB的性能优于最小方差波束形成器。

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