Widely linear (WL) robust adaptive beamforming exhibits superior performance by effectively leveraging the additional noncircularity information. However, existing studies focus solely on the noncircular (NC) impinging interferences, often overlooking main-lobe interferences and suffering from high computational complexity. To tackle these challenges, this article introduces a generalized WL sparse reconstruction (GWLSR) beamforming framework that addresses the general scenario where the impinging interferences consist of mixed circular and NC signals from a sparse reconstruction perspective. The framework considers two variants, GWLSR$_{1}$ and GWLSR$_{2}$, to accommodate circular and NC signal of interest, respectively. Within this framework, we can estimate the power of a larger number of interferences in the general scenario, supported by a root finding-based approach for direction-of-arrival (DOA) and NC phase (NCP) estimation. We then reconstruct the conjugate augmented interference-plus-noise covariance by leveraging the estimated DOAs, NCPs, and power associated with the interferences. The proposed beamformers are computational efficient as all the involved procedures can be formulated using close-form expressions. In addition, they can effectively suppress main-lobe interferences. Simulation examples are provided to illustrate the advantages of the proposed beamformers.
Generalized Widely Linear Robust Adaptive Beamforming: A Sparse Reconstruction Perspective
IEEE Transactions on Aerospace and Electronic Systems ; 60 , 5 ; 5663-5673
2024-10-01
1188885 byte
Article (Journal)
Electronic Resource
English