Joint Time-Domain Tracking of Channel and Frequency Offsets for MIMO OFDM Systems
Wireless Personal Communications: An International Journal
Detection of fading overlapping multipath components
Signal Processing - Signal processing in UWB communications
Adaptive subchip multipath resolving for wireless location systems
EURASIP Journal on Applied Signal Processing
Robust and computationally efficient signal-dependent method for joint DOA and frequency estimation
EURASIP Journal on Advances in Signal Processing
An energy-efficient localization algorithm for mobile vehicles in vehicle to vehicle network
Concurrency and Computation: Practice & Experience
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This paper considers the problem of estimating the time delays and Doppler shifts of a known waveform received via several distinct paths by an array of antennas. The general maximum likelihood estimator is presented, and is shown to require a 2d-dimensional nonlinear minimization, where d is the number of received signal reflections. Two alternative solutions based on signal and noise subspace fitting are proposed, requiring only a d-dimensional minimization. In particular, we show how to decouple the required search into a two-step procedure, where the delays are estimated and the Dopplers solved for explicitly. Initial conditions for the time delay search can be obtained by applying generalizations of the MUSIC and ESPRIT algorithms, which are also outlined in the paper. Simulation examples are included to illustrate the algorithms' performance relative to the Cramer-Rao bound