Spatial and Space-Time Algorithms for Synchronisation in the Downlink of the UMTS FDD and TDD Modes

This paper presents methods for synchronisation in the downlink of the FDD and TDD modes of a UMTS system. Space-time processing based on multiple receive antennas is used to suppress co-channel interference caused by other base stations. We develop a detection-based synchronisation procedure exploiting the structure of the respective UMTS mode, for which we present two alternative detection algorithms. Simulation results using various propagation environments indicate the good performance of our synchronisation methods in the presence of strong co-channel interference.