Spectrum Analyzer Center Frequency Issue

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Kaan Öner 2023-8-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2007087-spectrum-analyzer-center-frequency-issue

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?

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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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