Cartesian loop transmitter for TETRA

Author

De Mingo, Jesús ; Valdovinos, Antonio ; Gutiérrez, Fernando

Author_Institution

Centro Politecnico Superior, Zaragoza Univ., Spain

Volume

3

fYear

1999

fDate

1999

Firstpage

1511

Abstract

This paper presents the design process of a Cartesian loop transmitter and the simulated results include the effects of IQ modulator and demodulator, the requirements for the low-pass filter, open loop gain and loop delay, to verify the TETRA (Terrestrial European Trunked Radio) ACI mask and stability. The Cartesian feedback will suppose an algebraic equation for each sample at the input of the system. The modulator and demodulator errors are simulated using a matricial model for the gain and phase imbalances and DC-offset. The low-pass filter is simulated with a first order infinite impulsional response filter. The AM/AM and AM/PM power amplifier conversion is simulated with polynomic regression from Mitsubishi (M68749) measurements

Keywords

IIR filters; low-pass filters; modems; power amplifiers; radio transmitters; radiofrequency amplifiers; AM/AM power amplifier conversion; AM/PM power amplifier conversion; Cartesian loop transmitter; IQ modulator; M68749 measurements; Mitsubishi measurements; TETRA ACI mask; Terrestrial European Trunked Radio; algebraic equation; demodulator; first order infinite impulsional response filter; loop delay; low-pass filter; open loop gain; polynomic regression; stability; Delay effects; Demodulation; Equations; Feedback; Low pass filters; Phase modulation; Power system modeling; Process design; Radio transmitters; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th

Conference_Location

Amsterdam

ISSN

1090-3038

Print_ISBN

0-7803-5435-4

Type

conf

DOI

10.1109/VETECF.1999.801546

Filename

801546