Performance of an Adaptive Multiuser OFDM Uplink with Carrier Frequency Offsets

Author

Wang, Wei ; Ottosson, Tony ; Svensson, Tommy

Author_Institution

Dept. Signals & Syst., Chalmers Univ. of Technol., Goteborg

Volume

1

fYear

2006

fDate

7-10 May 2006

Firstpage

216

Lastpage

220

Abstract

Using an OFDM based uplink for future cellular networks has been a controversial issue due to difficulties in carrier frequency synchronization. In this paper, a model is provided to quantify the effects of Gaussian distributed carrier frequency offsets in a multiuser OFDM uplink. Both theoretical evaluations and simulations on spectral efficiency are performed in a slotted OFDM uplink, in which time-frequency bins are allocated adaptively to different users based on their channel conditions. The results show that the loss in spectral efficiency is small when the standard deviation of each user´s carrier frequency offset is no more than 2% of the subcarrier spacing

Keywords

Gaussian distribution; OFDM modulation; cellular radio; radio links; Gaussian distributed carrier frequency offsets; adaptive multiuser OFDM uplink; carrier frequency synchronization; future cellular networks; orthogonal frequency division multiplexing; slotted OFDM uplink; spectral efficiency; time-frequency bins; Demodulation; Downlink; Frequency synchronization; Interference; Modulation; OFDM; Payloads; Quadrature phase shift keying; Signal to noise ratio; Time frequency analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd

Conference_Location

Melbourne, Vic.

ISSN

1550-2252

Print_ISBN

0-7803-9391-0

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2006.1682807

Filename

1682807