An efficient non-iterative method for estimating the angles of arrival of known signals

The vast majority of existing high resolution angle of arrival (AOA) estimators are designed for the case of completely unknown signal waveforms. However, in many applications, such as mobile communications, the receiver has access to the structure of the incoming signals. By exploiting this extra information, a considerable improvement in estimation accuracy and/or computational complexity can be achieved. Herein, we propose a simple two-step procedure for the case of perfectly known waveforms (up to gain and phase). Despite its low complexity, the method can operate in the presence of arbitrary noise fields including interfering signals. Furthermore, if the signals of interest are uncorrelated, the proposed technique yields statistically efficient AOA estimates