DocumentCode :
3218555
Title :
Time-domain nearfield wideband beamforming based on fractional delay filters
Author :
Qi-li, Guo ; Chao, Sun
Author_Institution :
Inst. of Acoust. Eng., Northwestern Polytech. Univ., Xi´´an, China
fYear :
2011
fDate :
27-29 May 2011
Firstpage :
421
Lastpage :
425
Abstract :
In order to reduce the design burden of the wideband beamforming systems, a method of time-domain nearfield wideband beamforming is proposed in this paper. The proposed method which combines the nearfield compensation method together with fractional delay filters first performs nearfield compensation to the received signals using FIR fractional delay filters, before a time-domain farfield wideband beamformer which could remain unchanged with the source distance, as shown in Fig.1. A design example of a 30-element uniform linear array was given, and the design results show that, the nearfield broadband beampatterns obtained by this method can meet the expected design requirements of low sidelobe level and constant beamwidth, thus ensuring the performance of the time-domain nearfield wideband beamformer. The design example has proved that, this time-domain nearfield wideband beamforming method is a practical and feasible scheme, which can greatly reduce the design complexity of time-domain nearfield wideband beamforming systems.
Keywords :
FIR filters; array signal processing; delay filters; time-domain analysis; 30-element uniform linear array; FIR fractional delay filters; constant beamwidth; nearfield broadband beampatterns; nearfield compensation method; sidelobe level; source distance; time-domain farfield wideband beamformer; time-domain nearfield wideband beamforming; wideband beamforming systems; Array signal processing; Arrays; Delay; Finite impulse response filter; Sensors; Time domain analysis; Wideband; constant beamwidth; fractional delay; nearfield compensation; wideband beamforming;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communication Software and Networks (ICCSN), 2011 IEEE 3rd International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-61284-485-5
Type :
conf
DOI :
10.1109/ICCSN.2011.6013625
Filename :
6013625
Link To Document :
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