期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2015
卷号：77
期号：1
出版社：Journal of Theoretical and Applied
摘要：Beamforming algorithms are a digital signal processing algorithm which combined with uniform array in the smart antenna technology. Minimum Variance Distortionless Response (MVDR) is one of these algorithms which produce optimal adaptive complex weight for array�s elements. The overall radiation beam pattern is generated according to this weight for minimizing the radiation power and maintains the main beam in the desired direction with unity gain. The resolution of this method for estimating the signal DOA depends on steering vector, a small mismatch in this vector leads to degradation on MVDR performance. This paper presents a new model for enhancing the resolution of MVDR to estimate signal�s direction based on single Uniform Linear Array (ULA) with two reference elements. DOA covariance matrix is extracted according to these two references� matrices. Therefore, steering vector is constructed in actual mode with all impinging signals information. The null constraint is added to the proposed MVDR for producing robust weight vector that concern to the interference signals such as the concern to the desired signals.
关键词：Beamforming; DOA; MVDR; Smart antenna; Signal estimation; ULA; Null steering
