Time synchronization in the uplink of an OFDM system

Author

Wahlqvist, M. ; Larsson, R. ; Östberg, C.

Author_Institution

Dept. of Commun. Syst., Telia Res. AB, Lulea, Sweden

Volume

3

fYear

1996

fDate

28 Apr-1 May 1996

Firstpage

1569

Abstract

The use of orthogonal frequency division multiplex in a cellular system requires that the base station and the mobile station are time and frequency synchronized in order to preserve the orthogonality between the subcarriers. For the downlink a number of methods has been proposed for time and frequency synchronisation. For the uplink the problem is more difficult since each mobile has a unique radio transmission path to the base station. This article proposes and analyses the performance for a new scheme for initial time synchronisation. It is shown that a random access protocol based on the proposed scheme will have a good performance in a mobile radio environment

Keywords

cellular radio; frequency division multiple access; frequency division multiplexing; radio links; synchronisation; FDMA; OFDM system; base station; cellular system; frequency synchronisation; mobile radio environment; mobile station; orthogonal frequency division multiplex; performance analysis; radio transmission path; random access protocol; subcarriers; time synchronization; uplink; Access protocols; Base stations; Delay estimation; Discrete Fourier transforms; Frequency conversion; Frequency synchronization; Interference; OFDM; Timing; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th

Conference_Location

Atlanta, GA

ISSN

1090-3038

Print_ISBN

0-7803-3157-5

Type

conf

DOI

10.1109/VETEC.1996.504022

Filename

504022