GNU Radio 3.5.1 C++ API
digital_impl_mpsk_snr_est_m2m4 Class Reference

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

#include <digital_impl_mpsk_snr_est.h>

Inheritance diagram for digital_impl_mpsk_snr_est_m2m4:

List of all members.

Public Member Functions

 digital_impl_mpsk_snr_est_m2m4 (double alpha)
 ~digital_impl_mpsk_snr_est_m2m4 ()
int update (int noutput_items, const gr_complex *in)
 Update the current registers.
double snr ()
 Use the register values to compute a new estimate.

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

digital_impl_mpsk_snr_est_m2m4::digital_impl_mpsk_snr_est_m2m4 ( double  alpha)

Constructor

Parameters:

Parameters:
alpha,:the update rate of internal running average calculations.
digital_impl_mpsk_snr_est_m2m4::~digital_impl_mpsk_snr_est_m2m4 ( ) [inline]

Member Function Documentation

double digital_impl_mpsk_snr_est_m2m4::snr ( ) [virtual]

Use the register values to compute a new estimate.

Reimplemented from digital_impl_mpsk_snr_est.

int digital_impl_mpsk_snr_est_m2m4::update ( int  noutput_items,
const gr_complex in 
) [virtual]

Update the current registers.

Reimplemented from digital_impl_mpsk_snr_est.


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