what is the problem of the Power Amplifier curve for this WCDMA measurements ?

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Abdelwahab Afifi 2019-10-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485464-what-is-the-problem-of-the-power-amplifier-curve-for-this-wcdma-measurements

编辑： Abdelwahab Afifi 2019-10-16

I used the follwing link to get the data sets of input and output of PA to simluate PA model

https://www.mathworks.com/help/simrf/examples/power-amplifier-characterization-with-dpd-for-reduced-signal-distortion.html

I draw the follwoing figures:

1- input and output in time domain

2- the curve of the gain

3- the power gain transfer function

When I serach fro new swt of data ( for example WCDMA )

https://www.mathworks.com/help/comm/ug/adjacent-channel-power-ratio-acpr-.html

when I try to draw the aforementioned figures in this case, I get unexpected curves for gain & power gain transfer function

what is the problrm of this data set ?! why it didn't give me the predicted curves of PA nonlinearity ?

Here is the code I used to draw the figures

%----------------------------
clc
clear all
close all
load('simrfV2_powamp_dpd_data.mat')
DataRate = 15.36e6;
Tstep = 1/DataRate;
% PAPR calculations
PAPR_in=10*log10(max(abs(inDataPA).^2)/mean(abs(inDataPA).^2));
PAPR_out=10*log10(max(abs(outDataPA).^2)/mean(abs(outDataPA).^2));
% Draw time domain signals
numDataPts = length(inDataPA);
figure(1)
plot((1:numDataPts)*Tstep, abs(inDataPA),(1:numDataPts)*Tstep, abs(outDataPA))
legend('Abs(In)','Abs(Out)','Location','northeast')
xlabel('Time (s)')
xlim([0 1e-5])
ylabel('Voltage (V)')
title('Absolute Values of Input and Output Voltage Signals')
% Draw the PA characteristic curve
figure(2)
scatter(abs(inDataPA/max(inDataPA)),abs(outDataPA/max(outDataPA)),'r','MarkerEdgeColor',[0 .5 .5],...
              'MarkerFaceColor',[0 .8 .8],...
              'LineWidth',1.5)
xlabel('Normalized Input')
ylabel('Normalized Output')
title('PA curve')
% Draw gain in dB
TransferPA = abs(outDataPA./inDataPA);
figure(3)
plot(abs(inDataPA),20*log10(TransferPA),'.')
xlabel('Input Voltage Absolute Value(V)')
ylabel('Magnitude Power Gain (dB)')
title('Power Gain Transfer Function')
%----------------------------