A subspace-based blind detector with rapid channel tracking structure for TH-UWB systems over time-varying multi-path channels

Abstract

In this paper, the applicability of the subspace-based blind adaptive detector in multiple access time-hopping ultra-wideband (TH-UWB) systems is investigated. The subspace-based blind adaptive detector is highly sensitive to sudden changes in a time-varying channel. The sudden changes in such an environment result in significant performance degradation of the adaptive detector and slow convergence to the steady state. To overcome this shortcoming, we propose a simple decision mechanism, called "decision timing instant" (DTI), to detect the sudden changes. The results show that the subspace-based blind adaptive detector with DTI mechanism can improve both the system performance and convergence speed over time-varying multi-path channels.