gr::digital::mpsk_snr_est_m2m4 Class Reference

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

#include <mpsk_snr_est.h>

Inheritance diagram for gr::digital::mpsk_snr_est_m2m4:

List of all members.

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

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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.

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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]

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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