Title :
High efficiency voice activated CDMA mobile communication system based on master code synchronization
Author :
Gaudenzi, Riccardo De ; Viola, Roberto
Author_Institution :
Eur. Space Res. & Technol. Center, Noordwijk, Netherlands
Abstract :
The authors propose an innovative code division multiple access (CDMA)-based mobile system for voice (and data) services. The system makes use of voice activation in order to increase the CDMA efficiency (useful transmitted information vs. occupied bandwidth). The synchronization problems are solved by distributing a master code in the forward link and using forced link activation in the return when no speech activity is detected. The blocking probability is minimized by means of multirate speech coding associated with a centralized network control. Bit error rate calculations show all the advantages of operating in a synchronous mode
Keywords :
code division multiple access; data communication systems; error statistics; mobile radio systems; satellite relay systems; synchronisation; voice communication; BER evaluation; CDMA mobile communication system; bit error rate; blocking probability; centralized network control; code division multiple access; data services; forced link activation; master code synchronization; multirate speech coding; satellite access system; voice activation; voice services; Bandwidth; Bit error rate; Frequency synchronization; Mobile communication; Multiaccess communication; Radio frequency; Satellite broadcasting; Space technology; Speech coding; Transponders;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64064
