4-PAM/FM modulator with DSP: a solution for ERMES

Author

Bustillo, Jaime ; Rodriguez-Palanca, Miguel ; Pérez, Javier

Author_Institution

Telettra Espana SA, Madrid, Spain

fYear

1991

fDate

19-22 May 1991

Firstpage

584

Lastpage

588

Abstract

A new standard for paging systems is being released in Europe. This new ERMES system uses 4-PAM (pulse amplitude modulation)/FM modulation at 6250 b/s. This high bit rate requires a very careful design of the modulation scheme and the modulator itself to allow the usual methods of quasi-synchronous operation to cover large zones of terrain. For these reasons, the authors have designed a modulator for this system based on DSP (digital signal processing) that guarantees accuracy and stability. It is shown that one of the best choices for implementing the modulator of the ERMES system transmitters will be to use a quadrature modulator, with I-Q signals generated digitally. The structure of the modulator is presented together with simulations of its performance and some experimental results

Keywords

computerised signal processing; digital radio systems; frequency modulation; mobile radio systems; modulators; pulse amplitude modulation; 4-PAM/FM modulator; DSP modulator; ERMES system; Europe; digital signal processing; large zones; pulse amplitude modulation; quadrature modulator; quasi-synchronous operation; radiopaging; Amplitude modulation; Bit rate; Digital modulation; Digital signal processing; Europe; Pulse modulation; Signal design; Signal generators; Stability; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE

Conference_Location

St. Louis, MO

ISSN

1090-3038

Print_ISBN

0-87942-582-2

Type

conf

DOI

10.1109/VETEC.1991.140558

Filename

140558