Adaptive H∞ robust beamforming for imperfect antenna array

Authors:
Ann-Chen Chang;Ching-Tai Chiang
Affiliations:
Department of Electrical Engineering, Chung-Cheng Institute of Technology, Taoyuang 335, Taiwan, ROC;Department of Electrical Engineering, I-SHOU University, 1, Section 1, Hsueh-Cheng Rd., Ta-Hsu Hsiang, Kaohsiung County 84008, Taiwan, ROC
Venue:
Signal Processing
Year:
2002

Citing 3
Cited 0

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Adaptive filter theory (3rd ed.)
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Game theory approach to discrete H∞ filter design

IEEE Transactions on Signal Processing

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Abstract

The inherent robustness of the H∞ algorithm in dealing with modeling disturbances is used to improve the performance of imperfect antenna array with the generalized sidelobe canceller structure. The modeling disturbances include sensor gain perturbation, initial condition error, and colored noise contamination. The influence of modeling disturbances, which is not in volved in the recursive least squares (RLS) algorithm, is lumped into the estimation error minimization of the adaptive H∞ algorithm. Thus, an H∞-based beamformer converges faster and is more robust to imperfect antenna array than an RLS-based beamformer. Computer simulation results have been provided to show the robustness feature of the proposed technique when applied to an imperfect antenna array.