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: Research Article Improvement on EVESPA for Beamforming and Direction of Arrival Estimation Emmanuel Racine and Dominic Grenier | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 283020 5 pages doi 2011 283020 Research Article Improvement on EVESPA for Beamforming and Direction of Arrival Estimation Emmanuel Racine and Dominic Grenier Department of Electrical and Computer Engineering Laval University 1065 Avenue de la Medecine Quebec QC Canada G1V 0A6 Correspondence should be addressed to Emmanuel Racine Received 9 September 2010 Revised 18 January 2011 Accepted 22 February 2011 Academic Editor Laurence Mailaender Copyright 2011 E. Racine and D. Grenier. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. This paper presents an alternative estimation procedure of the generalized steering matrix of the sources in EVESPA suitable for both beamforming and direction of arrival estimation. It is shown how the estimation of such a matrix can be restricted to that of its corresponding coefficient matrix in the signal subspace providing both performance enhancement and computational complexity reduction. Performance comparison through numerical simulations is presented to confirm the effectiveness of the proposed procedure. 1. Introduction The EVESPA algorithm was introduced by Gonen et al. in 1 as an adapted version of VESPA to handle the case of coherent signals. Using fourth-order cumulants this algorithm properly generates an unbiased estimation of the generalized steering matrix GSM B of the sources from which an analysis of the signal parameters can be performed for each coherent group in an independent fashion. The same estimation procedure is also undertaken in 2 as a means of computing the weights of an optimal beamformer capable of maximizing the signal-to-interference plus noise ratio SINR in a coherent environment. EVESPA has also been .
