Wideband Beamforming for Multipath Signals Based on Spatial Smoothing Method

Chengcheng LIU  Dexiu HU  Yongjun ZHAO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.11   pp.1130-1133
Publication Date: 2014/11/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.1130
Type of Manuscript: BRIEF PAPER
Category: Electromagnetic Theory
Keyword: 
multipath,  beamforming,  spatial smoothing,  wideband,  

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Summary: 
In this paper, the spatial smoothing (SS) method is extended to the wideband multipath case. By reordering the array input signal and the weight vector, the corresponding covariance matrix of each subarray can be constructed conveniently. Then, a novel wideband beamforming algorithm, based on the SS method (SS-WB), can be achieved by linearly constrained minimum variance (LCMV). Further improvement of the output signal-to-interference-plus-noise ratio (SINR) for SS-WB can be obtained by removing the desired signal in the observed array data with the reconstruction of covariance matrix, which is denoted as wideband beamformer based on modified SS method (MSS-WB). Both proposed algorithms can reduce the desired signal cancellation due to the super decorrelation ability of SS method and MSS-WB can lead to a significantly improved output SINR. The simulations verify their effectiveness in the multipath environment.