Frequency division (FD)-based CDMA system which permits frequency offset

Author

Kohda, Tohru ; Jitsumatsu, Yutaka ; Fujino, Kenjiro ; Aihara, Kazuyuki

Author_Institution

Dept. of Inf., Kyushu Univ., Fukuoka, Japan

fYear

2010

fDate

17-20 Oct. 2010

Firstpage

61

Lastpage

66

Abstract

We propose a CDMA system which is regarded as a frequency dual of a chip-asynchronous DS/CDMA system. In such a system, each user´s signal may have a frequency offset, i.e. users´ carrier frequencies are not synchronised completely. We show that the variance of multiple access interference (MAI) is reduced when frequency offsets are introduced. Such an MAI can be further reduced if we employ Markovian frequency-domain spreading codes.

Keywords

Markov processes; code division multiple access; codes; frequency division multiple access; frequency-domain analysis; interference (signal); FD-based CDMA system; MAI; Markovian frequency-domain spreading code; carrier frequency; chip-asynchronous DS-CDMA system; direct sequence code division multiple access; frequency division based CDMA system; frequency offset; multiple access interference; Bandwidth; Markov processes; Optical wavelength conversion; Time frequency analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications (ISITA), 2010 IEEE 11th International Symposium on

Conference_Location

Taichung

ISSN

1943-7439

Print_ISBN

978-1-4244-6013-7

Electronic_ISBN

1943-7439

Type

conf

DOI

10.1109/ISSSTA.2010.5650056

Filename

5650056