tailieunhanh - Báo cáo hóa học: " An Approximate Algorithm for Robust Adaptive Beamforming"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An Approximate Algorithm for Robust Adaptive Beamforming | EURASIP Journal on Applied Signal Processing 2004 17 2675-2683 2004 Hindawi Publishing Corporation An Approximate Algorithm for Robust Adaptive Beamforming Tomoaki Yoshida NTT Access Network Service Systems Laboratories Chiba 261-0023 Japan Email tomoaki@ Youji Iiguni Department of Systems Innovation Graduate School of Engineering Science Osaka University Osaka 560-8531 Japan Email iiguni@ Received 11 February 2004 Revised 7 July 2004 Recommended for Publication by Mos Kaveh This paper presents an adaptive weight computation algorithm for a robust array antenna based on the sample matrix inversion technique. The adaptive array minimizes the mean output power under the constraint that the mean square deviation between the desired and actual responses satisfies a certain magnitude bound. The Lagrange multiplier method is used to solve the constrained minimization problem. An efficient and accurate approximation is then used to derive the fast and recursive computation algorithm. Several simulation results are presented to support the effectiveness of the proposed adaptive computation algorithm. Keywords and phrases robust array antenna Lagrange multiplier method Taylor series approximation direction of arrival. 1. INTRODUCTION The directionally constrained minimization of power DCMP adaptive array adjusts the array weights to minimize the mean output power while keeping the antenna response to the direction of arrival DOA of the desired signal 1 2 . When the true DOA is known a priori the DCMP array achieves a good performance. More precisely the array provides spatial filtering that maximizes the radar s sensitivityin the desired direction while suppressing interference signals coming from other directions and measurement noises. However if there is a mismatch between the prescribed and actual DOAs the desired signal is viewed as an interference and then suppressed 3 . Even a small mismatch may cause a significant performance .

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