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A Class of Constrained Adaptive Beamforming Algorithms Based on Uniform Linear Arrays

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3 Author(s)
Zhang, Lei ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK ; Wei Liu ; Langley, R.J.

A new class of adaptive beamforming algorithms is proposed based on a uniformly spaced linear array by constraining its weight vector to a specific conjugate symmetric form. The method is applied to the well-known reference signal based (RSB) beamformer and the linearly constrained minimum variance (LCMV) beamformer as two implementation examples. The effect of the additional constraint is equivalent to adding a second step in the derived adaptive algorithm. However, a difference arises for the RSB case since no direction-of-arrival (DOA) information of the desired signal is available, which leads to a two-stage structure for incorporating the imposed constraint. Compared to the traditional algorithms, the proposed ones can achieve a faster convergence speed and a higher steady state output signal-to-interference-plus-noise ratio, given the same stepsize.

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Signal Processing, IEEE Transactions on  (Volume:58 ,  Issue: 7 )