2D Markovian SS codes flatten time-frequency distribution of signals in asynchronous Gabor division CDMA systems

Author

Kohda, Tohru ; Jitsumatsu, Yutaka ; Aihara, Kazuyuki

Author_Institution

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

fYear

2011

fDate

22-27 May 2011

Firstpage

3140

Lastpage

3143

Abstract

We propose a Gabor division (GD)-CDMA system which permits time and frequency offsets. Negatively correlated time- and frequency-domain spreading codes have shown to reduce the variances of mutual- and self-interferences. In this paper, we show that such negatively correlated spreading codes have another important property that they flatten the time-frequency energy distributions of signals in GD-CDMA system.

Keywords

Markov processes; code division multiple access; codes; radiofrequency interference; signal processing; spread spectrum communication; time-domain analysis; time-frequency analysis; 2D Markovian SS codes; Gabor division system; asynchronous gabor division CDMA systems; correlated time-domain spreading codes; flatten time-frequency distribution; frequency offsets; frequency-domain spreading codes; mutual-interference variance; negative correlated spreading codes; self-interferences; signal distribution; spread spectrum code; Frequency conversion; Markov processes; Multiaccess communication; RNA; Time frequency analysis; Timing; Ambiguity function; CDMA; Spread Spectrum code; Time and frequency offsets; interference;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on

Conference_Location

Prague

ISSN

1520-6149

Print_ISBN

978-1-4577-0538-0

Electronic_ISBN

1520-6149

Type

conf

DOI

10.1109/ICASSP.2011.5946687

Filename

5946687