Multiuser DA-ML estimation of multipath channel delays for a DS-CDMA uplink

This paper deals with the synthesis and the performance analysis of multiuser delay estimators of multipath channels according to the maximum likelihood (ML) criterion in data aided (DA) mode for a BPSK DS-CDMA uplink. We suppose the channel tap weights are known perfectly, and we are interested in the estimation of the path delays. We perform open-loop (S-curve) and closed loop mean squared estimated error (MSEE) analysis in tracking mode and we compare the results to the classical Cramer-Rao lower bound (CRLB).