This paper presents an uncertainty-set-shrinkage (USS) algorithm that aims to reconstruct a precise interference-plus-noise covariance matrix (INCM) and improve the performance of adaptive beamformers when steering vector (SV) mismatch exists. Both of the interference covariance matrix (ICM) and the desired signal covariance matrix (DSCM) can be divided into two parts, namely the nominal matrix reconstructed using the nominal SVs and the error matrix consisting of the residual component of the covariance matrix. By using a two-step uncertainty set shrinkage method, the proposed beamformer constructs the error matrices by integrating the estimated spatial spectrum over the shrinked uncertainty set at a cost of low computational complexity. After extracting the principal component of the reconstructed ICM and DSCM, the INCM and the SV of the source of interest (SOI) can be estimated without solving any optimization problem. Both of numerical simulations and experimental results demonstrate that the performance of the proposed algorithm is robust with several categories of SV mismatches.
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This work is supported by the China Postdoctoral Science Foundation under Grant 2019M660049XB, and by the Fundamental Research Funds for the Central Universities, CHD under Grant 300102240302.
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Chen, P., Yang, Y. An uncertainty-set-shrinkage-based covariance matrix reconstruction algorithm for robust adaptive beamforming. Multidim Syst Sign Process 32, 263–279 (2021). https://doi.org/10.1007/s11045-020-00737-w
- Adaptive beamforming
- Covariance matrix reconstruction
- Principal component
- Uncertainty set shrinkage