Comparison of downlink and uplink MC-DS-CDMA sensitivity to carrier frequency offsets

Author

Steendam, Heidi ; Moeneclaey, Marc

Author_Institution

Telecommun. & Inf. Process. (TELIN) Dept., Ghent Univ., Gent, Belgium

Volume

3

fYear

2001

fDate

2001

Firstpage

1693

Abstract

We study the sensitivity of uplink and downlink MC-DS-CDMA to carrier frequency offsets, assuming orthogonal spreading sequences. For both uplink and downlink MC-DS-CDMA, we show that the performance rapidly degrades for an increasing ratio of maximum frequency offset to carrier spacing. We point out that the degradation in the uplink is larger than in the downlink, because only the former is affected by multiuser interference. For a given (small) ratio of maximum frequency offset to carrier spacing, enlarging the spreading factor in a fully loaded system does not affect the downlink degradation, but strongly increases the uplink degradation

Keywords

code division multiple access; land mobile radio; modulation; multiuser channels; radio links; radiofrequency interference; spread spectrum communication; carrier frequency offsets; downlink MC-DS-CDMA; downlink degradation; fully loaded system; maximum frequency offset to carrier spacing ratio; multiuser interference; orthogonal spreading sequences; spreading factor; uplink MC-DS-CDMA; uplink degradation; Bandwidth; Degradation; Downlink; Filters; Frequency; Information processing; Interference; Noise measurement; OFDM modulation; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd

Conference_Location

Rhodes

ISSN

1090-3038

Print_ISBN

0-7803-6728-6

Type

conf

DOI

10.1109/VETECS.2001.944983

Filename

944983