Joint Angle and Delay Estimation (JADE) for Signals in Multipath Environments

We propose a subspace-based approach to estimate the angles-of-arrival (AOAs) and delays of multipath signals from one or more digitally modulated sources arriving at an antenna array. Our approach uses a collection of estimates of a consistent space-time vector channel. The channel estimates from different time slots in TDMA systems have constant path AOA and delay over the observed periods, but variable fade amplitudes between the slots. With this approach, we are able to estimate more parameters than the number of antennas. The Cramer-Rao bound for the parameter estimates is also provided. 1. Introduction In wireless communications, mobiles emit signals that arrive at a base station with multiple paths, each with its own angle-of-arrival (AOA), path delay, and fading. Many practical applications, such as radar, sonar, and mobile localization for 911 service, require estimating the AOAs and delays of signals. This work proposes a novel approach (JADE) to estimating the AOAs and delay..