Title :
A two-stage beamformer with enhanced resistance against larger pointing errors
Author_Institution :
Dept. of Electron. Eng., Nat. United Univ., Miaoli, Taiwan
Abstract :
In this paper, a theoretical analysis on the output signal-to-interference-plus-noise ratio (SINR) for the eigenspace beamformer is carried out to examine the performance degradation due to larger pointing errors. As a remedy, a robust two-stage scheme is proposed for adaptive beamformer. A time-efficient algorithm is first developed to adjust the direction-of-arrival (DOA) estimate of the desired source. By exploiting the refined DOA estimate, an eigenspace beamformer incorporating with the spatial derivative constraints (SDC) is then used to further mitigate desired signal cancellation. Analysis and numerical results demonstrate the robustness against pointing errors and superiority over conventional methods.
Keywords :
array signal processing; direction-of-arrival estimation; eigenvalues and eigenfunctions; signal denoising; DOA; adaptive beamformer; direction-of-arrival; eigenspace beamformer; enhanced resistance; signal cancellation; signal-to-interference-plus-noise ratio; spatial derivative constraints; time-efficient algorithm; two-stage beamformer; Antenna arrays; Degradation; Direction of arrival estimation; Interference constraints; Interference elimination; Noise cancellation; Performance analysis; Robustness; Signal analysis; Signal to noise ratio;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2009 IEEE 20th International Symposium on
Conference_Location :
Tokyo
Print_ISBN :
978-1-4244-5122-7
Electronic_ISBN :
978-1-4244-5123-4
DOI :
10.1109/PIMRC.2009.5449920