Bandlimited quasi-synchronous CDMA: a novel satellite access technique for mobile and personal communication systems

Author

De Gaudenzi, Riccardo ; Elia, Carlo ; Viola, Roberto

Author_Institution

Dept. of Electr. Syst., ESA, Noordwijk, Netherlands

Volume

10

Issue

2

fYear

1992

fDate

2/1/1992 12:00:00 AM

Firstpage

328

Lastpage

343

Abstract

Recent trends in digital communications are opening commercial applications to code division multiple access (CDMA). A novel access technique based on bandlimited quasi-synchronous CDMA (BLQS-CDMA) is described, showing all the advantages of synchronizing conventional direct sequence CDMA to drastically reduce the effect of self-noise. Bandlimitation is achieved with no detection loss by means of Nyquist chip shaping, leading to a simple all-digital demodulator structure. Detection losses due to imperfect carrier frequency and chip timing synchronization are analytically derived and numerical results are checked by computer simulations. Impairments due to satellite transponder distortions are evaluated. The full digital modem structure is presented, together with possible applications to mobile and very small aperture terminal (VSAT) satellite communications

Keywords

code division multiple access; demodulation; mobile radio systems; modems; satellite relay systems; synchronisation; Nyquist chip shaping; VSAT communication; bandlimited quasi-synchronous CDMA; chip timing synchronization; code division multiple access; demodulation; digital modem structure; imperfect carrier frequency; mobile satellite radio; satellite transponder distortions; very small aperture terminal; Application software; Computer simulation; Demodulation; Digital communication; Frequency synchronization; Modems; Multiaccess communication; Satellites; Timing; Transponders;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.126984

Filename

126984