Title :
Spread spectrum synchronization for a LEO personal communications satellite system
Author :
Dodds, David E. ; Moher, Michael
Author_Institution :
Saskatchewan Univ., Saskatoon, Sask., Canada
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;
Conference_Titel :
Electrical and Computer Engineering, 1995. Canadian Conference on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-2766-7
DOI :
10.1109/CCECE.1995.528065
