Time Reversal Direction of Arrival Estimation with Cramer-Rao Bound Analysis

In this paper, the effect of coupling time reversal (TR) to direction of arrival (DOA) estimation is studied through theoretical Cramer-Rao bound (CRB) analysis and numerical simulations. The proposed TR/DOA estimator adds an additional stage and retransmits the time-reversed versions of the observations made during the original forward probing stage. The backscatters of the time reversed probing signals obtained from this second TR stage is used for DOA estimation based on the Capon algorithm. Simulations results and CRBs comparing the performance of the proposed TR/DOA estimator with that of the conventional approach based only on observations from the forward probing stage are presented.