Effacer les filtres
Effacer les filtres

commsrc.pattern help

2 vues (au cours des 30 derniers jours)
Leor Greenberger
Leor Greenberger le 7 Oct 2011
Modifié(e) : Richard Allred le 14 Juin 2021
I am having trouble using commsrc.pattern to generate the following psuedo-random binary signal:
Pattern: PRBS7
Bitrate: 28E9
Rise time: 10E-12
Fall time: 10E-12
Output Levels: [475E-3 725E-3]
PulseWidth = 35.71E-12 seconds (at 50% point)
I tried something like the following:
z = commsrc.pattern('SamplingFrequency',10*br,'SamplesPerSymbol',25,'PulseType','NRZ', 'OutputLevels', [-475E-3 725E-3], 'RiseTime', 10E-12, 'PulseDuration', 35.71E-12 , 'FallTime', 10E-12, 'DataPattern', 'PRBS7')
but it doesn't work. Any ideas?

Réponse acceptée

Richard Allred
Richard Allred le 10 Juin 2021
Modifié(e) : Richard Allred le 14 Juin 2021
The property 'PulseDuration' is only valid when the 'PulseType' is 'RZ'. To solve your issue, simply don't specify the Pulse Duration property:
br = 28e9;
SamplesPerSymbol = 25;
z1 = commsrc.pattern(...
'SamplingFrequency',br,...
'SamplesPerSymbol',SamplesPerSymbol,...
'PulseType','NRZ', ...
'OutputLevels', [-475E-3 725E-3], ...
'RiseTime', 10E-12, ...
...'PulseDuration', 35.71E-12 , ...
'FallTime', 10E-12, ...
'DataPattern', 'PRBS7')
w1 = generate(z1,127);
figure(1),plot(w1)
An alternative solution is to use the stimulus object from the SerDes Toolbox
z2 = serdes.Stimulus(...
'SymbolTime',1/br,...
'SampleInterval',1/br/SamplesPerSymbol,...
'Modulation',2,...
'Order',7,...
'MapToVoltage',[-475E-3 725E-3]);
N = SamplesPerSymbol*127;
w2 = zeros(N,1);
for ii = 1:N
w2(ii) = step(z2);
end
figure(2),plot(w2)

Plus de réponses (0)

Catégories

En savoir plus sur Design and Simulate SerDes Systems dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by