Adaptive H/sup ∞/ delay tracking in asynchronous DS-CDMA systems

Abstract

In this paper a new ITm-type delay acquisition/tracking approach is proposed which is based on partitioning of the PN-code matrix of the CDMA users into submatrices which are then used to form a 'state-space' Hm-type linear combiner. The proposed novel formulation and approach is robust to modelling errors such as over-and underestimation of the number of signals present and provides a powerful near-far resistant delaytracking solution in a multiuser DS-CDMA signal environment.

MIMO Radar: An H-Infinity Approach for Robust Multitarget Tracking in Unknown Cluttered Environment

“…In contrast, for a non-robust algorithm such as LS (or H 2 ) based Recursive Least-Squares (RLS) or KF, small disturbances may lead to large estimation errors if the assumptions on the disturbances are violated [34]. The H ∞ tracking approach has been proposed in the past for applications such as passive source tracking [35], communications [36], [37], and radar [10]. Under the H ∞ framework, a propagator is recursively estimated, which can be used to form a subspace that is orthogonal to the signal subspace.…”