Cyclostationarity based DOA estimation for wideband sources with a conjugate minimum-redundancy linear array

Cyclostationarity based direction of arrival (DOA) estimation is of interest due to its immunity to interference and noise. Recently the use of cyclic methods with a conjugate minimum-redundancy linear array (MRLA) and an appropriate matrix augmentation technique was exploited by Gelli and Izzo (1997) to improve the performance of cyclic MUSIC for narrowband signals. In this paper, we propose a cyclostationarity based wideband signal DOA estimation method with a conjugate MRLA. Exploiting the similarity of our problem to DOA estimation for coherent signals, we propose to utilize the forward/backward spatial smoothing (FBSS) technique in our method instead of using the matrix augmentation technique. It is shown that our new method, in addition to generalizing the previous method to wideband signals, is able to detect more signals with improved performance to the previous method.