GFSK Demod

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Revision as of 14:51, 21 July 2021 by Solomonbstoner (talk | contribs) (Add example flowgraph for the GFSK Demod block)
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Hierarchical block for Gaussian Minimum Shift Key (GFSK) demodulation.

The input is the complex modulated signal at baseband.

The output is a stream of bits packed 1 bit per byte (the LSB)


Samples per baud >= 2 (integer)
Given to the Quadrature Demod
Gain Mu
Controls rate of mu adjustment
Fractional delay [0.0, 1.0]
Omega Relative Limit
Sets max variation in omega (float, typically 0.000200 (200 ppm))
Freq Error
Bit rate error as a fraction
Print information about modulator?
Print modualtion data to files? (bool)

Example Flowgraph

The flowgraph below shows an example of the GFSK Mod and GFSK Demod blocks in action. We GFSK modulate 9-bit long bit stream '000111011', and then GFSK demodulate it. Then we compare the two bit streams to make sure that they are the same.

Gfsk mod and demod.png

When the flowgraph runs, we see that the red and blue signals are the same, meaning that the bit streams before and after the GFSK modulation and demodulation are the same.

Gfsk mod and demod in action.png

Source Files

Python files
Block definition