Struct ppe_state_t¶

PolynomialPhaseEstimator state (FFT plan + rate grid + scratch). More...

#include <ppe_core.h>

Public Attributes¶

Type	Name
float _Complex *	buf
double	drate
fft_state_t *	fft
float *	mag
size_t	max_len
double	max_rate
size_t	n_rate
size_t	nfft
double *	rowfrq
double *	rowpk
float _Complex *	spec
float *	win

Detailed Description¶

Allocate with ppe_create().

Public Attributes Documentation¶

variable buf¶

float _Complex* ppe_state_t::buf;

windowed, dechirped, zero-padded input, nfft.

variable drate¶

double ppe_state_t::drate;

chirp-rate grid step.

variable fft¶

fft_state_t* ppe_state_t::fft;

forward plan, size nfft.

variable mag¶

float* ppe_state_t::mag;

dB magnitude scratch, nfft.

variable max_len¶

size_t ppe_state_t::max_len;

max input length (sizes the plan/scratch).

variable max_rate¶

double ppe_state_t::max_rate;

chirp-rate search half-span (cycles/sample^2).

variable n_rate¶

size_t ppe_state_t::n_rate;

number of chirp-rate hypotheses (1 if max_rate=0).

variable nfft¶

size_t ppe_state_t::nfft;

zero-padded transform length: 4 * next_pow2 (max_len). The 4x is deliberate a finer frequency grid before the parabolic peak refinement, which matters because the input is often short (preamble partials, symbol streams). It also sizes buf, spec and mag, so the footprint is 4x what a bare next-pow2 would suggest.

variable rowfrq¶

double* ppe_state_t::rowfrq;

per-rate winning frequency, n_rate.

variable rowpk¶

double* ppe_state_t::rowpk;

per-rate winning peak dB, n_rate.

variable spec¶

float _Complex* ppe_state_t::spec;

FFT output, nfft.

variable win¶

float* ppe_state_t::win;

window scratch, max_len.

The documentation for this class was generated from the following file native/inc/ppe/ppe_core.h