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In this paper, we present a simplified mutual coupling matrix (MCM) for Sparse Circular Arrays (SCA) that is used for underdetermined direction of arrival (DOA) estimation. The array type used in this paper is composed of dense and sparse parts that obtains very low mutual coupling (MC). This leads to a banded-like MCM. By incorporating the MCM in the DOA estimation problem, SCA is capable of DOA...
In this paper, the problem of direction-of-arrival (DOA) estimation for quasi-stationary signals is addressed using non-uniform circular arrays called nested circular array. We use the Khatri-Rao (KR) subspace approach to obtain an increase in the degrees of freedom. Thus, the nested circular array is capable of resolving more sources than the number of sensors. We therefore perform overdetermined...
Direction-Of-Arrival (DOA) estimation is one of the most important field in array signal processing. This paper presents a compact Reactance based Uniform Circular Array (RB-UCA) antenna system and a technique to steer nulls using optimized reactances as well as to estimate DOAs. A comparison between optimized and random reactances is presented by finding the array pattern when two interfering signals...
This paper presents an IIR-formed adaptive array via realizing feedback structure with DOA (Direction-Of-Arrival) estimator. The output of adaptive array is basically given as a weighted sum of multiple array inputs, which can be regarded as an FIR filtering in spatial domain. One may consider spatial IIR filtering but it is unfeasible because spatial delay element does not exist. Recalling that IIR...
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