GNU Radio Manual and C++ API Reference  3.7.9.2
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gr::digital::mpsk_snr_est_svr Class Reference

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 ()
 
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

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

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

Constructor

Parameters:

Parameters
alphathe update rate of internal running average calculations.
gr::digital::mpsk_snr_est_svr::~mpsk_snr_est_svr ( )
inline

Member Function Documentation

double gr::digital::mpsk_snr_est_svr::snr ( )
virtual

Use the register values to compute a new estimate.

Reimplemented from gr::digital::mpsk_snr_est.

int gr::digital::mpsk_snr_est_svr::update ( int  noutput_items,
const gr_complex input 
)
virtual

Update the current registers.

Reimplemented from gr::digital::mpsk_snr_est.


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