Robust cyclic adaptive beamforming using a compensation method

Authors:
Ju-Hong Lee;Chia-Cheng Huang
Affiliations:
Room 517, Building 2, Graduate Institute of Communication Engineering, National Taiwan University, Taipei 10617, Taiwan and Department of Electrical Engineering, National Taiwan University, Taipei ...;Room 517, Building 2, Graduate Institute of Communication Engineering, National Taiwan University, Taipei 10617, Taiwan
Venue:
Signal Processing
Year:
2012

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Abstract

This paper deals with the problem of robust adaptive array beamforming using signal cyclostationarity. The constrained cyclic adaptive beamforming (C-CAB) algorithm presented by Wu and Wong (1996) [6] has been shown to be effective in performing adaptive beamforming without requiring the direction vector or the waveform of the desired signal. However, this algorithm suffers from severe performance degradation even if there is a small mismatch in the cycle frequency of the desired signal. In this paper, we first evaluate the performance degradation of the C-CAB algorithm in the presence of cycle frequency error (CFE). A novel compensation method in conjunction with the subspace projection is then proposed to tackle the problem due to CFE. We reconstruct the required cyclic conjugate correlation matrix by using a compensation matrix to cope with the deterioration of its dominant singular value when CFE exists. Finally, several simulation examples are provided to show the effectiveness of the proposed algorithm.