Title :
A "Decision and Re-Solving" Beamformer for the PAM Communication System
Author :
Liu, Wenlong ; Ding, Shuxue
Author_Institution :
Dalian Univ. of Technol., Dalian
Abstract :
Minimum variance distortionless response (MVDR) beamforming is known to degrade due to effects of imprecise knowledge about the steering vector and finite sample size. However, the theoretical reasons for these have not been well investigated yet. In this paper, we propose a new mathematical model about beamforming. In the new model, beamforming is posed as ill-conditioned linear equations. The new model can clearly explain why the MVDR method suffers significant performance degradation when the knowledge about the steering vector is imprecise and the sample size is finite. Using the new model, we also propose a new beamformer for the PAM communication, which is termed as "decision and resolving beamformer". Numerical experiments have shown the robustness of the proposed beamformer against imprecise knowledge on the steering vector and/or against the finite signal length effect.
Keywords :
optical communication; pulse amplitude modulation; PAM communication system; beamformer; beamforming; finite sample size; finite signal length effect; ill-conditioned linear equations; mathematical model; minimum variance distortionless response; pulse amplitude modulation; steering vector; Array signal processing; Communication systems; Degradation; Equations; Interference; Mathematical model; Sensor arrays; Signal resolution; Signal to noise ratio; Vectors;
Conference_Titel :
Innovative Computing Information and Control, 2008. ICICIC '08. 3rd International Conference on
Conference_Location :
Dalian, Liaoning
Print_ISBN :
978-0-7695-3161-8
Electronic_ISBN :
978-0-7695-3161-8
DOI :
10.1109/ICICIC.2008.4