Nonlinearities modelling methodinfluence inHighPowerAmplifier on theCDMA spectral analysis
Laurent Lecheminoux, Martine Villegas · 1999
Theradio frequency ressource utilization in mobilecommunication requires more efficient modulation andmultiple accesscheme. TheCDMA withspread spectrum signal hasbeenadopted infew wireless communications systems. Butasinother system, themostcritcal components istheHighPower Amplifier. Firstly, thetarget ofthis paperistoprovide an comparative analysis, basedon co-simulation circuit/system ofanMMIC poweramplifier. Mostof systems usenonconstant envelope modulations, to achieve ahighdegree ofspectral efficiency, butthose modulations aremoresensitive tothenonlinearities of thecircuits. Sointhesecondpart,foranTDMA scheme test theperformances ofdifferents modulations, bycalculating theAdjacent Channel PowerRatio and theErrorVector Measurement