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Medium-scale or large-scale receive antenna array with digital beamformingcan be employed at receiver to make a significant interference reduction, butleads to expensive cost and high complexity of the RF-chain circuit. To dealwith this issue, a classic analog-and-digital beamforming (ADB) structure wasproposed in the literature for greatly reducing the number of RF-chains. Basedon the ADB structure, we in this paper propose a robust hybrid ADB scheme toresist directions of arrival (DOAs) estimation errors. The key idea of ourscheme is to employ null space projection (NSP) in analog beamforming domainand diagonal loading (DL) method in digital beamforming domain. Simulationresults show that the proposed scheme performs more robustly, and moreover, hasa significant improvement on the receive signal to interference plus noiseratio (SINR) compared to NSP ADB scheme and DL method.

A Robust Secure Hybrid Analog and Digital Receive Beamforming Scheme for Efficient Interference Reduction