Spread spectrum synchronization for a LEO personal communications satellite system

Author

Dodds, David E. ; Moher, Michael

Author_Institution

Saskatchewan Univ., Saskatoon, Sask., Canada

Volume

1

fYear

1995

Firstpage

20

Abstract

This paper investigates required signal structure and receiver code synchronization techniques for satellite based CDMA personal communications systems. A signal structure is proposed in which different CDMA codes are used to differentiate each satellite (as in the GPS system) and different phases of one code (as in the IS-95 standard) to differentiate spot beams on one satellite. Due to satellite overlap, the number of effective co-users in each cell can be two or three times the number of actual cell users which leads to a required spreading gain in the order of 20 times the actual number of cell users. The paper investigates correlator receiver structures and shows that the optimum correlation time is 400-1000 chips when the number of effective co-users is 100

Keywords

code division multiple access; correlation methods; mobile satellite communication; personal communication networks; pseudonoise codes; radio receivers; spread spectrum communication; synchronisation; CDMA codes; GPS system; IS-95 standard; LEO personal communications satellite system; correlator receiver structures; optimum correlation time; receiver code synchronization; satellite overlap; signal structure; spot beams; spread spectrum synchronization; spreading gain; Artificial satellites; Base stations; Communication industry; Correlators; Delay effects; Doppler shift; Frequency; Low earth orbit satellites; Multiaccess communication; Spread spectrum communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 1995. Canadian Conference on

Conference_Location

Montreal, Que.

ISSN

0840-7789

Print_ISBN

0-7803-2766-7

Type

conf

DOI

10.1109/CCECE.1995.528065

Filename

528065