torchsig.signals.builders.fsk.get_fsk_mod_index

torchsig.signals.builders.fsk.get_fsk_mod_index(fsk_type: str, rng: Generator | None = None) → float

Determines the modulation index for different FSK variants.

The modulation index is derived from the symbol spacing in the frequency domain. Orthogonal FSK has a modulation index of 1.0, and MSK/GMSK have 0.5.

Parameters:

• fsk_type – Type of FSK modulation (‘fsk’, ‘gfsk’, ‘msk’, ‘gmsk’).

• rng – Random number generator for reproducibility. If None, creates a new default generator.

Returns:

Modulation index.

Return type:

float

Raises:

ValueError – If fsk_type is not one of the supported types.