Direction Finding Using Cumulant in Multipath Environment with an Arbitrary Array

Maryam Johnny, Vahid Tabataba Vakili, Mansour Sheikhan

Electrical Engineering Depart- ment, Iran University of Science and Technology, Tehran, Iran.
Electrical Engineering Department, Islamic Azad University-South Tehran Branch, Tehran, Iran.

DOI: 10.4236/jsip.2012.32029                

Abstract

In this paper, the problem of estimating the direction of arrival of signals of which some may be perfectly correlated is considered. This method can be applied in the situation that the non-Gaussian independent and coherent signals coexist with unknown Gaussian noise. In this method at first via mappings, the virtual uniform linear array (ULA) and also the shifted versions of this virtual ULA by assuming that all the DOAs are located in one section are constructed. In order to avoid coloring the noise because of these mappings we use a cumulant matrix instead of a covariance ones. In this method since we construct all the subarrays virtually for detection of coherent signals we do not need the array with regular configuration. The advantages of this method are: increasing the array aperture, having the ability to find the DOAs with fewer sensors and also avoiding the coupling between sensors as much as possible in contrast to conventional spatial smoothing.

Keywords

Array Interpolation; Direction of Arrival; MUSIC; Cumulant; Uniform Linear Array

Conflicts of Interest

The authors declare no conflicts of interest.

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