Wideband Direction-of-Arrival Estimation and Phase Noise Compensation

This paper proposes an estimation method of wideband direction-of arrival (DoA) by using multiple snapshots in the presence of phase noise (PN). PNs generated by different oscillators configured for individual radio frequency (RF) chains bring significant difficulties to the DoA estimation, especially at millimeter-wave frequencies. In order to solve the problem of DoA estimation for wideband signals in the presence of PNs, we divide each snapshot into several segments and use a piece-wise linear model to obtain the discrete Fourier transform (DFT) of the signals received by the antenna array to avoid complex convolution. Then we estimate the DoA and PN parameters iteratively by employing the modified Newton method. To evaluate the performance of our proposed method, we compare the root mean square error (RMSE) of the DoA and PNs estimates with their corresponding true values, respectively. Simulation results demonstrate the effectiveness of our proposed method in the joint DoA estimation and PN compensation.