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PIER PIER B PIER C PIER M PIER Letters
2011-08-16
A Differential Evolution Approach for Robust Adaptive Beamforming Based on Joint Estimation of Look Direction and Array Geometry
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

P. N. Suganthan,

    Dr. P. N. Suganthan

    Nanyang Technological Univ

    Singapore

    Homepage

Sirajudeen Gulam Razul,

    Dr. Sirajudeen Gulam Razul

    Nanyang Technological University

    Singapore

    Homepage

Chong Meng S. See

    Dr. Chong Meng S. See

    DSO National Laboratories

    Singapore

    Homepage

Progress In Electromagnetics Research, Vol. 119, 381-394, 2011
doi:10.2528/PIER11052205
Abstract
The performance of traditional beamformers tends to degrade due to inaccurate estimation of covariance matrix and imprecise knowledge of array steering vector. The inaccurate estimation of covariance matrix can be attributed to limited data samples and the presence of desired signal in the training data. The mismatch between the actual and presumed steering vectors can be due to the error in the position (geometry) and/or in the look direction estimate. In this paper, we propose a differential evolution (DE) based robust adaptive beamforming that is able to achieve near optimal performance even in the presence of geometry error. Initially, we estimate an optimal steering vector by maximizing and minimizing the signal power in and out of the desired signal's angular range, respectively. Then, we estimate the look direction and reconstruct the covariance matrix. Based on the obtained steering vector, estimate for look direction and reconstructed covariance matrix, near optimal output SINR, can be obtained with the increase in the input SNR without observing any saturation even in the presence of geometry error. Numerical simulations are presented to demonstrate the efficacy of the proposed algorithm.
Citation
Rammohan Mallipeddi, Joni Lie, P. N. Suganthan, Sirajudeen Gulam Razul, and Chong Meng S. See, "A Differential Evolution Approach for Robust Adaptive Beamforming Based on Joint Estimation of Look Direction and Array Geometry," Progress In Electromagnetics Research, Vol. 119, 381-394, 2011.
doi:10.2528/PIER11052205
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