Spectrum Analyzer Center Frequency Issue

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Kaan Öner
Kaan Öner 2023-8-10
编辑： Saksham 2023-8-24
I am designing 'modulation data and adding noise' simulation in Matlab app designer. This is my carrier signal specs.
Fc = 300
Fs = 1000
T = 1/Fs
L = length(app.modulated_data)
t = (0:L-1)'*T
app.carrier = sin(2*pi*Fc*t)
In spectrum analyzer I cant change center frequency. I am using Raised cossine transmit filter before plotting spectrum analysis. There are codes bellow:
function results = spectrum_plot(app)
txfilter = comm.RaisedCosineTransmitFilter("Shape","Square root", ...
"FilterSpanInSymbols",10, ...
"RolloffFactor",0.2, ...
"OutputSamplesPerSymbol",8);
app.spectrum_signal = txfilter(app.compression_noised_signal);
[p,f] = pspectrum(app.spectrum_signal)
plot(app.UIAxes3,f,pow2db(p))
end
Why my carrier frequency doesn't appear in the spectrum analyzer?
  1 个评论
Saksham
Saksham 2023-8-24
编辑：Saksham 2023-8-24
Hi Kaan,
I can observe in the code shared by you that you are assigning signal to 'app.carrier' but in function 'spectrum_plot', you are using 'app.compression_noised_signal'.
Please confirm if this is the expected code or not.
Sincerely,
Saksham

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