Title :
Cartesian loop transmitter for TETRA
Author :
De Mingo, Jesús ; Valdovinos, Antonio ; Gutiérrez, Fernando
Author_Institution :
Centro Politecnico Superior, Zaragoza Univ., Spain
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;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.801546
