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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2011-07-07
Robust Adaptive Beamforming Based on Covariance Matrix Reconstruction for Look Direction Mismatch
By
Rammohan Mallipeddi,

    Dr. Rammohan Mallipeddi

    School of Electrical and Electronic Engineering

    Nanyang Technological University

    Singapore

    Homepage

Joni Lie,

    Dr. Joni Lie

    School of Electrical and Electronic Engineering

    Nanyang Technological University

    Singapore

    Homepage

Sirajudeen Gulam Razul,

    Dr. Sirajudeen Gulam Razul

    Nanyang Technological University

    Singapore

    Homepage

P. N. Suganthan,

    Dr. P. N. Suganthan

    Nanyang Technological Univ

    Singapore

    Homepage

Chong Meng S. See

    Dr. Chong Meng S. See

    DSO National Laboratories

    Singapore

    Homepage

Progress In Electromagnetics Research Letters, Vol. 25, 37-46, 2011
doi:10.2528/PIERL11040104 | Google Scholar

Abstract
The performance degradation in traditional adaptive beamformers can be attributed to the imprecise knowledge of the array steering vector and inaccurate estimation of the covariance matrix. The inaccurate estimation of the covariance matrix is due to the limited data samples and presence of desired signal components in the training data. The mismatch between the actual and presumed steering vectors can be mainly due to the error in the look direction estimate. In this paper, we propose a novel algorithm to estimate the look direction and to reconstruct the covariance matrix so that near optimal performance without the effect of saturation can be achieved as the input SNR increases. Numerical results also show that all existing beamforming algorithms suffer from saturation effect as the input SNR increases.
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Citation
Rammohan Mallipeddi, Joni Lie, Sirajudeen Gulam Razul, P. N. Suganthan, and Chong Meng S. See, "Robust Adaptive Beamforming Based on Covariance Matrix Reconstruction for Look Direction Mismatch," Progress In Electromagnetics Research Letters, Vol. 25, 37-46, 2011.
doi:10.2528/PIERL11040104
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