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Journal of Electrical and Computer Engineering
Volume 2015, Article ID 964901, 8 pages
http://dx.doi.org/10.1155/2015/964901
Research Article

Improved Mainlobe Interference Suppression Based on Blocking Matrix Preprocess

1School of Communication and Information, Ai’an University of Post & Telecommunication, Xi’an, Shaanxi 710121, China
2Research Institute of Electronic Countermeasure, Xidian University, Xi’an, Shaanxi 710071, China

Received 10 February 2015; Revised 19 March 2015; Accepted 20 March 2015

Academic Editor: John N. Sahalos

Copyright © 2015 Jie Yang and Congfeng Liu. 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.

Abstract

For the problem of mainlobe direction shifting that is caused by the mainlobe interference suppression based on blocking matrix preprocess, an effective method is proposed which is based on the combination of diagonal loading and linear constraints. Therein, the reason for mainlobe direction shifting is analyzed and found to be that the covariance matrix mismatch exists in the realization of the adaptive beamforming. Therefore, the diagonal loading processing is used to overcome the mismatch and correct the mainlobe direction shifting, and the linear constraints are used to make sure of the beam pattern nulling in the interference directions; then the desired performance of adaptive beamforming is obtained. Simulation results attest the correctness and effectiveness of the proposed method, and they also show that the proposed method is insensitive to the selection of diagonal loading level, which means the loading factor is easy to choose.