eye diagram measurements error

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Muhammad Rizwan 2020-5-5

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编辑： Sandis Spolitis 2021-1-27

HI I have query regarding eye diagram measurements.

I am trying to get the eye diagram measurements for my transmitter.

I get proper eye diagram but it never displays the measuemnets results on the right side of eye diagram.

WHAT CAN BE THE POSSIBLE REASON FOR THIS

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Sandis Spolitis 2021-1-27

编辑：Sandis Spolitis 2021-1-27

在 MATLAB Online 中打开

Hi!

You need to use the following lines for eye diagram object:

'DisplayMode','2D color histogram', ...

and

'OversamplingMethod','Input interpolation', ...

Also, make sure that your values are biased to zero (signal has no DC component). Fastest way to remove DC is:

DC=mean(data);
data=data-DC;

Eye plot example below:

eyeObj = comm.EyeDiagram('SampleRate', Fs,...
'SamplesPerSymbol', samples_per_bit, ...
'EnableMeasurements',true,'DisplayMode','2D color histogram', ... 
'SymbolsPerTrace', 2, ... 
'OversamplingMethod','Histogram interpolation', ...
'ColorScale','Linear', ... %Choose between Logarithmic / Linear 
'ShowGrid',true,...
'YLimits',[1.1*min(data) 1.1*max(data)]);
set(gcf,'color','w');
eyeObj(data); %plot the eye with the above defined parameters
eyestats = measurements(eyeObj);