gr::digital::mpsk_snr_est_m2m4 Class Reference

SNR Estimator using 2nd and 4th-order moments. More...

#include <gnuradio/digital/mpsk_snr_est.h>

Public Member Functions
	mpsk_snr_est_m2m4 (double alpha)
	~mpsk_snr_est_m2m4 ()
int	update (int noutput_items, const gr_complex *input)
	Update the current registers. More...
double	snr ()
	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 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

SNR Estimator using 2nd and 4th-order moments.

An SNR estimator for M-PSK signals that uses 2nd (M2) and 4th (M4) order moments. This estimator uses knowledge of the kurtosis of the signal (k_a) and noise (k_w) to make its estimation. We use Beaulieu's approximations here to M-PSK signals and AWGN channels such that k_a=1 and k_w=2. These approximations significantly reduce the complexity of the calculations (and computations) required.

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

gr::digital::mpsk_snr_est_m2m4::mpsk_snr_est_m2m4

(

double

alpha

)

Constructor

Parameters:

Parameters

alpha

the update rate of internal running average calculations.

gr::digital::mpsk_snr_est_m2m4::~mpsk_snr_est_m2m4 ( )

inline

Member Function Documentation

double gr::digital::mpsk_snr_est_m2m4::snr ( )

virtual

Use the register values to compute a new estimate.

Reimplemented from gr::digital::mpsk_snr_est.

int gr::digital::mpsk_snr_est_m2m4::update ( int  noutput_items, const gr_complex *  input  )

virtual

Update the current registers.

Reimplemented from gr::digital::mpsk_snr_est.

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The documentation for this class was generated from the following file:

• mpsk_snr_est.h