Title :
A novel spectrum efficient land mobile radio communication system
Author :
Kotzin, Michael D. ; Van den Heuvel, Anthony P. ; Hong, Daehyoung
Author_Institution :
Motorola Inc., Arlington Heights, IL, USA
Abstract :
An experimental land mobile radio communication system which offers a significant improvement in spectrum efficiency over current analog 25-kHz FM radio is presented. Up to four voice channels are provided on a single 25-kHz spaced radio channel. A novel speech coding/constant envelope modulation technique is utilized along with a TDM/TDMA (time division multiplexing/time division multiple access) radio format. The system exhibits fully encryptable communication quality speech and improved sensitivity (range) while achieving adjacent channel splatter performance which meets the FCC mask for secure voice communications
Keywords :
encoding; mobile radio systems; time division multiple access; time division multiplexing; voice communication; TDM/TDMA; adjacent channel splatter performance; land mobile radio communication system; secure voice communications; spectrum efficiency; speech coding/constant envelope modulation; time division multiple access; time division multiplexing; voice channels; Bandwidth; Cryptography; FCC; Information filtering; Information filters; Land mobile radio; Mobile communication; Modulation coding; Space technology; Speech coding;
Conference_Titel :
Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-87942-582-2
DOI :
10.1109/VETEC.1991.140454
