Frequency-Shift Keying (FSK) A.7 To generate the continuous phase FSK signal sf, with mark and space frequencies of 4 and 8 kHz, respectively: • generate a polar NRZ signal from the sequence b; • apply the polar waveform to the input of a voltage controlled os- cillator (VCO). In this experiment the VC0 has the free-running frequency set to 6 kHz and has frequency sensitivity of -2 kHz/V. » xf = wave-gen (b, 'polarnrz'); » sf = vcom (xf); A.8 Display waveformspxf and sf for ) < t < 5 T,- nspxi > subplot(211), waveplot(xp, 5) > subplot(212), waveplot(sf, 5) Display and record the PSD function of the FSK signal. clf > psd (sf,fr) Q4.1 How can you generate an FSK signal from two ASK signals? For a system where efficient bandwidth utilization is required, which modulation scheme would you prefer?
Frequency-Shift Keying (FSK) A.7 To generate the continuous phase FSK signal sf, with mark and space frequencies of 4 and 8 kHz, respectively: • generate a polar NRZ signal from the sequence b; • apply the polar waveform to the input of a voltage controlled os- cillator (VCO). In this experiment the VC0 has the free-running frequency set to 6 kHz and has frequency sensitivity of -2 kHz/V. » xf = wave-gen (b, 'polarnrz'); » sf = vcom (xf); A.8 Display waveformspxf and sf for ) < t < 5 T,- nspxi > subplot(211), waveplot(xp, 5) > subplot(212), waveplot(sf, 5) Display and record the PSD function of the FSK signal. clf > psd (sf,fr) Q4.1 How can you generate an FSK signal from two ASK signals? For a system where efficient bandwidth utilization is required, which modulation scheme would you prefer?
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Transcribed Image Text:Frequency-Shift Keying (FSK)
A.7 To generate the continuous phase FSK signal sf, with mark and space
frequencies of 4 and 8 kHz, respectively:
• generate a polar NRZ signal from the sequence b;
• apply the polar waveform to the input of a voltage controlled os-
cillator (VCO). In this experiment the VCO has the free-running
frequency set to 6 kHz and has frequency sensitivity of -2 kHz/V.
> xf = wave_gen (b, 'polar nrz’);
vcom(xf);
sf =
A.8 Display waveformspxf and sf for 0 < t < 5 T,.
> subplot(211), waveplot(xp, 5)
> subplot(212), waveplot(sf, 5)
Display and record the PSD function of the FSK signal.
clf
» psd(sf,fr)
Q4.1 How can you generate an FSK signal from two ASK signals?
For a system where efficient bandwidth utilization is required,
which modulation scheme would you prefer?
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