SNR Estimator using simple mean/variance estimates. More...

#include <gnuradio/digital/mpsk_snr_est.h>

Public Member Functions
	mpsk_snr_est_simple (double alpha)

	~mpsk_snr_est_simple () override

int	update (int noutput_items, const gr_complex *input) override
	Update the current registers.

double	snr () override
	Use the register values to compute a new estimate.

Public Member Functions inherited from gr::digital::mpsk_snr_est
	mpsk_snr_est (double alpha)

virtual	~mpsk_snr_est ()

double	alpha () const
	Get the running-average coefficient.

void	set_alpha (double alpha)
	Set the running-average coefficient.

virtual double	signal ()
	Returns the signal power estimate.

virtual double	noise ()
	Returns the noise power estimate.

Additional Inherited Members
Protected Attributes inherited from gr::digital::mpsk_snr_est
double	d_alpha

double	d_beta

double	d_signal

double	d_noise

Detailed Description

SNR Estimator using simple mean/variance estimates.

A very simple SNR estimator that just uses mean and variance estimates of an M-PSK constellation. This estimator is quick and cheap and accurate for high SNR (above 7 dB or so) but quickly starts to overestimate the SNR at low SNR.

Constructor & Destructor Documentation

◆ mpsk_snr_est_simple()

gr::digital::mpsk_snr_est_simple::mpsk_snr_est_simple ( double alpha )

Constructor

Parameters:

Parameters

alpha the update rate of internal running average calculations.

◆ ~mpsk_snr_est_simple()

gr::digital::mpsk_snr_est_simple::~mpsk_snr_est_simple ( )

inlineoverride

Member Function Documentation

◆ snr()

double gr::digital::mpsk_snr_est_simple::snr ( )

overridevirtual

Use the register values to compute a new estimate.

Reimplemented from gr::digital::mpsk_snr_est.

◆ update()

int gr::digital::mpsk_snr_est_simple::update	(	int	noutput_items,
		const gr_complex *	input
	)

overridevirtual

Update the current registers.