Signal-to-Variation Ratio SNR Estimator. More...

#include <gnuradio/digital/mpsk_snr_est.h>

Public Member Functions
	mpsk_snr_est_svr (double alpha)

	~mpsk_snr_est_svr () override

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

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

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. More...

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

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

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

virtual double	signal ()
	Returns the signal power estimate. More...

virtual double	noise ()
	Returns the noise power estimate. More...

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

Signal-to-Variation Ratio SNR Estimator.

This estimator actually comes from an SNR estimator for M-PSK signals in fading channels, but this implementation is specifically for AWGN channels. The math was simplified to assume a signal and noise kurtosis ( \(k_a\) and \(k_w\)) for M-PSK signals in AWGN. These approximations significantly reduce the complexity of the calculations (and computations) required.

Original paper: A. L. Brandao, L. B. Lopes, and D. C. McLernon, "In-service monitoring of multipath delay and cochannel interference for indoor mobile communication systems," Proc. IEEE Int. Conf. Communications, vol. 3, pp. 1458-1462, May 1994.

Reference: D. R. Pauluzzi and N. C. Beaulieu, "A comparison of SNR estimation techniques for the AWGN channel," IEEE Trans. Communications, Vol. 48, No. 10, pp. 1681-1691, 2000.

Constructor & Destructor Documentation

◆ mpsk_snr_est_svr()

gr::digital::mpsk_snr_est_svr::mpsk_snr_est_svr ( double alpha )

Constructor

Parameters:

Parameters

alpha the update rate of internal running average calculations.

◆ ~mpsk_snr_est_svr()

gr::digital::mpsk_snr_est_svr::~mpsk_snr_est_svr ( )

inlineoverride

Member Function Documentation

◆ snr()

double gr::digital::mpsk_snr_est_svr::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_svr::update	(	int	noutput_items,
		const gr_complex *	input
	)

overridevirtual

Update the current registers.