Digital joint phase and sampling instant synchronisation for UMTS standard

Abstract

Publication Date: 3-7 April 2005 On page(s): 1037- 1040 ISBN: 0-7803-9068-7 INSPEC Accession Number: 8670636 Digital Object Identifier: 10.1109/WCACEM.2005.1469760 Posted online: 2005-08-15 08:23:55.International audienceIn asynchronous direct-sequence code division multiple access (DS-CDMA) receivers, one of the major functions is timing and phase synchronisation. Many proposed solutions treat these functions separately. In this paper we present a new joint synchronisation solution for UMTS standard. This solution is based on a digital delay and phase looked loops. In addition this implementation is programmable for the two modes of UMTS (FDD and TDD) with variable over-sampling factor. It has tested in real time on TigerSHARC DSP

Novel Joint Chip Sampling and Phase Synchronization Algorithm for Multistandard UMTS Systems

“…In a DLL the received signal is cross-correlated with an early and a late copy of a pilot signal. The proposed tracking algorithm is inspired from the concept of lock loop to establish estimation [14]. So the complex correlation function of the received signal and pilot signal is computed in three points (which corresponds to original, early and late copy of the pilot signal).…”

“…For the feedback corrector, an interpolator [15] is used to find the sample at the estimated instant; the used interpolator gives good compromises between precision and real time application. The correction of phase rotation consists of multiplying the received signal by the complex exponential of estimated phase [14,15].…”