Usage

This section presents examples of how to use the library for each supported modulation type.

GFSK

The GFSK modulation can be used through the GFSK class, using the modulate and demodulate methods. An example of usage can be seen in the code below:

from pymodulation import GFSK

mod = GFSK(2.5, 0.5, 9600)  # Modulation index = 2.5, BT = 0.5, Baudrate = 9600 bps

data = list(range(100))

samples, fs, dur = mod.modulate(data)

print("IQ Samples:", samples[:10])

bits, bb_sig = mod.demodulate(fs, samples)

print("Demodulated bits:", list(map(int, bits)))

The modulate method returns the IQ samples of the generated signal, the corresponding sampling rate, and the signal duration in seconds. The demodulate method allows the demodulation of a GFSK signal, taking the corresponding IQ samples and sampling rate as input, and producing as output the data bitstream contained in the signal and the baseband signal samples (in NRZ format).

GMSK

This modulation can be used in a manner almost identical to GFSK modulation, with the difference that in this case the modulation index is fixed at 0.5, as expected for this type of modulation. An example of usage can be seen in the code below.

from pymodulation import GMSK

mod = GMSK(0.5, 9600)   # BT = 0.5, baudrate = 9600 bps

data = list(range(100))

samples, fs, dur = mod.modulate(data)

print("IQ Samples:", samples[:10])

bits, bb_sig = mod.demodulate(fs, samples)

print("Demodulated bits:", list(map(int, bits)))