waveform_psk
Phase modulation.
Namespace: dsp::telecom
Prototype
sptr<WaveForm> waveform_psk(unsigned int M, const ShapingFilterSpec &filtre=nrz())
Parameters
| M | Number of bits / symbol. |
| filtre | Shaping filter (default: NRZ) |
Returns
Abstract waveform pointer (WaveForm).
Description
Creation of M-PSK waveform.
- Warning
- \(M\) must be a power of 2.
Example 1: Some PSK modulations
Figures f;
pour( auto M: {2, 4, 8, 16})
{
soit w = forme_onde_psk(M);
soit constel = w->constellation();
f.subplot().plot_iq(constel, "o" , w->desc());
}
Waveforms examples: BPSK, QPSK, 8PSK, 16PSK
Example 2: Theoretical bit error rates
soit w2 = forme_onde_psk(2),
w4 = forme_onde_psk(4),
w8 = forme_onde_psk(8);
soit EbN0 = linspace(-2, 15, 20);
soit ber2 = w2->ber(EbN0),
ber4 = w4->ber(EbN0),
ber8 = w8->ber(EbN0);
Figure f;
f.plot(EbN0, ber2, "-ob" , "bpsk" );
f.plot(EbN0, ber4, "-g" , "qpsk" );
f.plot(EbN0, ber8, "-rs" , "8psk" );
f.titres( "BER théorique PSK" , "Eb/N0" , "Taux d'erreur binaire" );
f.axes().def_echelle( "lin" , "log" );
BER