Time and frequency synchronization for uplink OFDM-CDMA

Author

Kan Zheng ; Lin Huang ; Maomao Chen ; Wenbo Wang

Author_Institution

Sch. of Telecommun. Eng., Beijing Univ. of Posts & Telecommun., China

Volume

1

fYear

2004

Firstpage

349

Abstract

A novel OFDM-CDMA system, which merges the advantages of OFDMA and CDMA to minimize multiple access interference and is less vulnerable to asynchronism among users, becomes more suitable for uplink transmission. The paper presents a simple time and frequency synchronization method for uplink OFDM-CDMA. Symbol timing is achieved by making use of the good correlation property of training sequences that are distinguished, not only in the frequency domain, but also in the code domain. Frequency offsets are estimated using the maximum likelihood (ML) principle. Simulation results illustrate the high accuracy and efficiency of the proposed estimation algorithms.

Keywords

OFDM modulation; code division multiple access; frequency division multiple access; frequency estimation; maximum likelihood estimation; minimisation; mobile radio; radiofrequency interference; synchronisation; timing; OFDMA; correlation property; frequency estimation; frequency offset estimation; frequency synchronization; maximum likelihood estimation; mobile communications; multiple access interference; symbol timing; time synchronization; training sequences; uplink OFDM-CDMA; Downlink; Fading; Frequency estimation; Frequency synchronization; Gold; Interference; Multiaccess communication; Multicarrier code division multiple access; OFDM; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems, 2004. ICCCAS 2004. 2004 International Conference on

Conference_Location

Chengdu

Print_ISBN

0-7803-8647-7

Type

conf

DOI

10.1109/ICCCAS.2004.1346097

Filename

1346097