DocumentCode :
2211899
Title :
New recursive adaptive beamforming algorithms for uniform concentric circular arrays with frequency invariant characteristics
Author :
Chen, H.H. ; Chan, S.C. ; Ho, K.L.
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong, China
fYear :
2006
fDate :
4-8 Sept. 2006
Firstpage :
1
Lastpage :
4
Abstract :
This paper proposes new recursive adaptive beamforming algorithms for uniform concentric circular array (UCCA) that has nearly frequency invariant (FI) characteristics. By using a fixed compensation network, the far field pattern of a UCCA frequency invariant beamformer (FIB) is determined by a set of weights and it is approximately invariant over a wide range of frequencies. New recursive adaptive beamforming algorithms based on the least mean square (LMS) and recursive least square (RLS) algorithms and the Generalized Sidelobe Canceller (GSC) structure are proposed to address the high computational complexity of the sample matrix inversion (SMI) method proposed previously by the authors. Simulation results show that the proposed adaptive FI-UCCA beamformer requires much fewer variable taps than the conventional UCCA for the same steady-state performance, while offering much faster convergence speed.
Keywords :
adaptive signal processing; array signal processing; least mean squares methods; FIB; GSC structure; LMS algorithm; RLS algorithm; SMI method; UCCA frequency invariant beamformer; convergence speed; far field pattern; generalized sidelobe canceller structure; high computational complexity; least mean squares; recursive adaptive beamforming algorithms; recursive least square algorithm; sample matrix inversion method; uniform concentric circular arrays; Array signal processing; Broadband communication; Finite impulse response filters; Least squares approximations; Signal processing algorithms; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Conference, 2006 14th European
Conference_Location :
Florence
ISSN :
2219-5491
Type :
conf
Filename :
7071061
Link To Document :
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