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ABSTRACT: Conventional adaptive array antenna processing must observe signals on all of the array antenna elements. However, because the low-cost electronically steerable parasitic array radiator (ESPAR) antenna has only a single-port output, none of the signals on the antenna's parasitic elements can be observed. A direct application of most of the algorithms for the conventional adaptive array antenna is impractical. In this paper, A technique of estimation of direction-of-arrivals (DoAs) is proposed for the ESPAR antenna. This technique is based on the modified MUltiple SIgnal Classification (MUSIC) algorithm. The correlation matrix used in the MUSIC algorithm is estimated from the signal received through the single-port output of the ESPAR antenna as it switches over a set of antenna patterns. Simulation results show that DoAs can be estimated by the reactance domain MUSIC algorithm for ESPAR antennas. Furthermore, the statistical performance on estimation error variance of the reactance domain MUSIC estimator is analyzed and compared with the Crame´r-Rao lower bound. Analytic and empirical results show that high-resolution DoAs estimation can be achieved by using the reactance domain MUSIC algorithm for ESPAR antennas.
IEEE Transactions on Antennas and Propagation 01/2005; · 2.15 Impact Factor
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[show abstract]
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ABSTRACT: Conventional adaptive array antenna processing must observe signals on all of the array antenna elements. However, because the low-cost electronically steerable parasitic array radiator (ESPAR) antenna has only a single-port output, it is not possible to observe all of the signals on the antenna elements. A direct application of most of the algorithms for the conventional adaptive array antenna is impractical. In this paper, we propose a new technique of estimation for direction-of-arrivals (DoAs) for the ESPAR antenna. This technique is based on a modification of the MUSIC (multiple signal classification) algorithm. An M-dimension vector y of the output of the antenna is obtained by using the angular diversity provided by the ESPAR antenna reactances. Then the M by M correlation matrix of the y vector is employed to estimate the MUSIC spectrum. Simulation results show that DoAs can be estimated by the reactance domain MUSIC algorithm for ESPAR antennas.
Microwave Conference, 2003. 33rd European; 11/2003
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ABSTRACT: The electronically steerable parasitic array radiator (ESPAR) antenna offers low cost and low complexity relative to conventional array antennas. Because of the low complexity of the antenna there is only a single-port output for processing the signals impinging on the antenna elements. Since a reactance-domain MUSIC algorithm for ESPAR antennas has been proposed, the practical problem of estimating the direction of arrival of signals impinging toward an ESPAR antenna can be tackled. In this paper, two experimental methods of estimating the arrival signal angles are proposed. A method of solving the practical problem of calibrating the ESPAR antenna output signal model is also shown. The experimental results show that for one impinging signal the direction of arrival can be estimated with precision of 3 degrees.
Wireless Communications and Networking, 2003. WCNC 2003. 2003 IEEE; 04/2003
