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 () override | |
| int | update (int noutput_items, const gr_complex *input) override |
| Update the current registers. | |
| double | snr () override |
| Use the register values to compute a new estimate. | |
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. | |
| void | set_alpha (double alpha) |
| Set the running-average coefficient. | |
| virtual double | signal () |
| Returns the signal power estimate. | |
| virtual double | noise () |
| Returns the noise power estimate. | |
Additional Inherited Members | |
Protected Attributes inherited from gr::digital::mpsk_snr_est | |
| double | d_alpha |
| double | d_beta |
| double | d_signal |
| double | d_noise |
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.
| gr::digital::mpsk_snr_est_m2m4::mpsk_snr_est_m2m4 | ( | double | alpha | ) |
Constructor
Parameters:
| alpha | the update rate of internal running average calculations. |
References gr::digital::mpsk_snr_est::alpha().
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inlineoverride |
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overridevirtual |
Use the register values to compute a new estimate.
Reimplemented from gr::digital::mpsk_snr_est.
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overridevirtual |
Update the current registers.
Reimplemented from gr::digital::mpsk_snr_est.