  Recently, the higher order statistics (HOS) and sparsity based array are most
talked about techniques to estimate the Direction of Arrival (DoA). They not
only provide enhanced Degree of Freedom (DoF) to handle underdetermined cases
but also improve the estimation accuracy of the system. To achieve high
accuracy and more number of DoF with limited number of sensors, here we have
proposed a method based on the fourth order statistics. The aperture of virtual
array becomes O(16N^4) using N physical sensors. Proposed method can be
extended to the HOS which increases the DoF by many folds. Numeric simulation
validates these claims that the proposed method increases the resolution
capacity as well as maximize the DoF among all the earlier proposed method.
