Modeling of OFDM-based systems with frequency offsets and frequency selective fading channels

Author

Zhang, Wei ; Lindner, Jurgen

Author_Institution

Dept. of Inf. Technol., Ulm Univ., Germany

Volume

5

fYear

2005

fDate

30 May-1 June 2005

Firstpage

3072

Abstract

We derive vector transmission models for OFDM-based systems: pure OFDM, multiuser OFDM (OFDMA), CDM-OFDMA and MC-CDMA. Two kinds of OFDMA systems, conventional OFDMA and interleaved OFDMA are studied and the effects of frequency offset and multipath propagation are investigated. For each system both downlink and uplink transmission models are described. The models allow multiuser detection as a means to cope with carrier frequency offsets, which is especially useful for the uplink. The possibility of frequency offset estimation is discussed briefly.

Keywords

OFDM modulation; channel coding; channel estimation; fading channels; interleaved codes; multipath channels; multiuser channels; radio links; OFDM-based systems; downlink transmission models; frequency offsets; frequency selective fading channels; interleaved OFDMA; multipath propagation; multiuser detection; uplink transmission models; vector transmission models; Doppler shift; Downlink; Fading; Frequency diversity; Frequency estimation; Multiuser detection; OFDM; Spread spectrum communication; Transmitters; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st

ISSN

1550-2252

Print_ISBN

0-7803-8887-9

Type

conf

DOI

10.1109/VETECS.2005.1543912

Filename

1543912