Abstract
The conventional adaptive beamformers face the
problem of performance degradation in the presence of desired
signal in the training data snapshots if there is a small mismatch
between the presumed and the actual signal direction. In case of
such mismatch, these beamformers generate the main beam in the
presumed direction of desired signal and the actual signal with
mismatched direction is considered as the interference, so the
desired signal cancellation appears in this situation. This paper
presents the effect of direction of arrival mismatch on traditional
beamformers like minimum variance distortionless response
(MVDR) and generalized sidelobe canceller (GSC). Furthermore,
the performance comparison of different adaptive Beaforming
algorithms which are robust against direction of arrival mismatch
has also been done. These algorithms include worst case
performance optimization beamformer for direction of arrival
mismatch and generalized sidelobe canceller with modified
blocking matrix. Simulation results show that the GSC with
modified blocking matrix has better performance as compare to
the worst case performance optimization beamformer for
direction of arrival mismatch.
Zafar Ullah Khan, A. Naveed, I. M. Qureshi, Fawad Zaman. (2012) Comparison of Adaptive Beamforming Algorithms Robust Against Directional of Arrival Mismatch, Journal of Space Technology , Volume 2, Issue 1.
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