A time and frequency synchronization scheme for multiuser OFDM

Author

van de Beek, J.-J. ; Börjesson, Per Ola ; Boucheret, Marie-Laure ; Landström, Daniel ; Arenas, Julia Martinez ; Ödling, Per ; Ostberg, Christer ; Wahlqvist, Mattias ; Wilson, Sarah Kate

Author_Institution

Nokia Svenska AB, Stockholm, Sweden

Volume

17

Issue

11

fYear

1999

fDate

11/1/1999 12:00:00 AM

Firstpage

1900

Lastpage

1914

Abstract

We present a multiuser synchronization scheme for tracking the mobile´s uplink time and frequency offsets. It uses the redundancy introduced by the cyclic prefix and does not need additional pilots. We show performance results of an orthogonal frequency division multiplexing (OFDM)-based radio interface based on the universal mobile telecommunication system (UMTS) parameters. For a UMTS-typical mobile channel environment, the performance of a coherent system employing the scheme is virtually indistinguishable from the performance of a perfectly synchronized system. In a differentially modulated system, synchronization errors decrease the system performance by about 0.7 dB compared to a perfectly synchronized system

Keywords

OFDM modulation; cellular radio; frequency division multiple access; frequency estimation; multiuser channels; network interfaces; radio links; radio tracking; synchronisation; time division multiple access; UMTS; coherent system; cyclic prefix; differentially modulated system; frequency offset estimation; frequency offset tracking; frequency synchronization; hybrid TDMA/FDMA scheme; mobile channel environment; mobile uplink; multiuser OFDM; orthogonal frequency division multiplexing; performance results; radio interface; symbol error rate; synchronization errors; system performance; time offset tracking; time synchronization; universal mobile telecommunication system; 3G mobile communication; Base stations; Broadcasting; Downlink; Frequency estimation; Frequency synchronization; GSM; OFDM; Proposals; Time division multiple access;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.806820

Filename

806820