Narrowband FM cellular system

Author

Levine, Steve ; Carney, Scott ; Baker, James

Author_Institution

Motorola Inc., Schaumburg, IL, USA

fYear

1990

fDate

6-9 May 1990

Firstpage

237

Lastpage

243

Abstract

The voice and data transmission parameters of a spectrally-efficient analog frequency division multiple access (FDMA) cellular system with 12.5 kHz channel assignments are described. Low-speed 100 bit/s Manchester data is transmitted during voice activity and provides channel control. In addition, 200 bit/s baseband data patterns support channel supervision. The use of this subaudible signaling method has yielded improved system operation. Eliminating the high-frequency supervisory audio tone has reduced adjacent-channel interference and has allowed increased voice deviation. Using the low-speed data for control messages does not require interruption of the voice activity. The handoff and disconnect protocols have improved falsing protection over current systems

Keywords

cellular radio; data communication systems; frequency division multiple access; frequency modulation; radiotelephony; voice communication; 100 bit/s; 12.5 kHz; 200 bit/s; FDMA; FM cellular system; Manchester data; adjacent-channel interference; analog system; baseband data patterns; channel assignments; channel control; channel supervision; data transmission; disconnect protocols; falsing protection; frequency division multiple access; handoff protocol; narrowband system; subaudible signaling method; transmission parameters; voice transmission; Baseband; Channel spacing; Data communication; Frequency division multiaccess; Interference elimination; Narrowband; Protection; Protocols; Research and development; Speech;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1990 IEEE 40th

Conference_Location

Orlando, FL

ISSN

1090-3038

Type

conf

DOI

10.1109/VETEC.1990.110327

Filename

110327