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wideband beamforming for Multipath Signals Based on Frequency Invariant Transformation

International Journal of Automation and computing 2012年第4期9卷 420-428页

作者： Wei Liu Communications Research Group,Department of Electronic & Electrical Engineering,University of Sheffield,Sheffield,S1 3JD,UK Communications Research Group Department of Electronic & Electrical Engineering University of Sheffield Sheffield UK

It is well known that the performance of conventional adaptive beamformers degrades severely due to the presence of coherent or correlated interferences(multipath propagation) and various techniques have been developed to improve the performance of the ***,most of the work in the past has been focused on the narrowband *** this paper,the wideband beamforming problem in the presence of multipath signals is addressed,with a novel approach proposed by employing a pre-processing stage based on the frequency invariant beamforming(FIB) *** this approach,the received wideband array signals are first processed by an FIB network,and then a traditional narrowband adaptive beamformer or an appropriate instantaneous blind source separation(BSS) algorithm can be applied to the network *** is shown that with the proposed structure,cancellation of the desired signal is reduced,leading to a significantly improved output signal to interference plus noise ratio(SINR).

关键词： wideband beamforming multipath signals frequency invariant beamforming blind beamforming convolutive mixtures.

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A wideband beamforming method based on directional uniform circular arrays

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Science China(Information Sciences) 2010年第12期53卷 2600-2609页

作者： MU PengCheng ,YIN QinYe & ZHANG JianGuo Ministry of Education Key Lab for Intelligent Networks and Network Security,School of Electronics and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China Ministry of Education Key Lab for Intelligent Networks and Network Security School of Electronics and Information Engineering Xi’an Jiaotong University Xi’an China

A new method for solving the wideband beamforming problem is proposed in this paper based on directional uniform circular *** basic idea is designing a narrowband beamforming spatial filter at a specific frequency and using the obtained filter weights directly to wideband signals,which reduces the complexities of designing and *** the premise of knowing signals’ direction information,this paper uses the method of least square with linear constraints to design the narrowband spatial *** the directional uniform circular array is insensitive to the variation of frequency,coincident beams and notches are obtained at different frequencies of the wideband signal by using the obtained narrowband spatial filter *** computation complexity of array signal processing can be greatly reduced by using the method proposed in this paper,which is convenient for real-time signal processing.

关键词： array signal processing wideband beamforming uniform circular array spatial filter least square

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