Direction-of-arrival estimation for constant modulus signals

In many cases where direction finding is of interest, the signals impinging on an antenna array are known to be phase modulated and, hence, to have a constant modulus (CM). This is a strong property; by itself, it is already sufficient for source separation and can be used to construct improved dire...

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Bibliographic Details
Published in:IEEE transactions on signal processing 1999-11, Vol.47 (11), p.3125-3129
Main Authors: Leshem, A., van der Veen, A.-J.
Format: Article
Language:English
Subjects:
Antenna arrays
Applied sciences
Detection, estimation, filtering, equalization, prediction
Direction of arrival estimation
Directive antennas
Exact sciences and technology
Information, signal and communications theory
Iterative algorithms
Multiple signal classification
Phased arrays
Sensor arrays
Signal and communications theory
Signal processing
Signal processing algorithms
Signal, noise
Source separation
Telecommunications and information theory
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Summary:In many cases where direction finding is of interest, the signals impinging on an antenna array are known to be phase modulated and, hence, to have a constant modulus (CM). This is a strong property; by itself, it is already sufficient for source separation and can be used to construct improved direction finding algorithms. We first derive the relevant Cramer-Rao bounds (CRBs) for arbitrary array configurations and specialize to uniform linear arrays. We then propose a simple suboptimal direction estimation algorithm in which the signals are separated using the CM property followed by direction finding on the decoupled signals. Compared with the ESPRIT algorithm and the CRB for arbitrary signals, the algorithm shows good results.
ISSN:1053-587X
1941-0476
DOI:10.1109/78.796446