Three types of cumulant matrices for DOA estimation of coherent signals based on a uniform circular array

This paper focuses on applying a fourth-order cumulant with spatial smoothing to direction of arrival (DOA) estimation of coherent signals based on a uniform circular array (UCA). We use three types of cumulant matrices in the so-called mode space with spatial smoothing to handle this problem. The DOA estimation performance comparisons of these cumulant matrices with spatial smoothing are shown by some theoretical analysis and simulations, and some useful results are concluded.