Sensitivity of OFDM-CDMA Systems to Carrier Frequency Offset

Author

Nasser, Youssef ; Noes, Mathieu Des ; Ros, Laurent ; Jourdain, Geneviève

Author_Institution

CEA-LETI, 38054 Grenoble cedex 09 France. youssef.nasser@cea.fr

Volume

10

fYear

2006

fDate

38869

Firstpage

4577

Lastpage

4582

Abstract

This paper presents the impact of a carrier frequency offset on the performance of 2 dimensional spreading OFDM-CDMA systems. This is measured by the degradation of the Signal to Interference plus Noise Ratio (SINR) obtained after despreading and equalization. Using some properties of random matrix and free probability theories, a new expression of the SINR is derived. It is independent of the actual value of the spreading codes while still accounting for the orthogonality between codes. This model is validated by means of Monte-Carlo simulations. It is also exploited to compare the sensitivities of MC-CDMA and MC-DS-CDMA systems to carrier offset in a frequency selective channel. This work is carried out for zero forcing (ZF) and minimum mean square error (MMSE) equalizers.

Keywords

Degradation; Equalizers; Frequency synchronization; Interference; Mean square error methods; Multiaccess communication; Multicarrier code division multiple access; OFDM; Signal to noise ratio; Transmitters; Carrier offset; MC-CDMA; MC-DS-CDMA; OFDM-CDMA; SINR;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2006. ICC '06. IEEE International Conference on

Conference_Location

Istanbul

ISSN

8164-9547

Print_ISBN

1-4244-0355-3

Electronic_ISBN

8164-9547

Type

conf

DOI

10.1109/ICC.2006.255361

Filename

4024759