Joint DoA and TDoA Estimation for mmWave Communications Using Zadoff-Chu Sequence

In this paper, we propose a joint DoA and TDoA estimation algorithm for mmWave communications. The key idea of proposed scheme is to use the pilot signal generated from the Zadoff-Chu sequence. Zadoff-Chu sequence is a type of constant amplitude zero auto-correlation (CAZAC) sequence that has a circular auto-correlation property. Using this property, we can effectively determine the time delay of multi-path signals. Also, by applying the maximum likelihood (ML) estimation at the Zadoff-Chu pilot measurements, we can acquire high resolution DoAs and corresponding path gains.