digital_impl_snr_est_m2m4 Class Reference
SNR Estimator using 2nd and 4th-order moments. More...
#include <digital_impl_mpsk_snr_est.h>
Public Member Functions | |
| digital_impl_snr_est_m2m4 (double alpha, double ka, double kw) | |
| ~digital_impl_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. In this case, you can set your own estimations for k_a and k_w, the kurtosis of the signal and noise, to fit this estimation better to your signal and channel conditions.
A word of warning: this estimator has not been fully tested or proved with any amount of rigor. The estimation for M4 in particular might be ignoring effectf of when k_a and k_w are different. Use this estimator with caution and a copy of the reference on hand.
The digital_mpsk_snr_est_m2m4 assumes k_a and k_w to simplify the computations for M-PSK and AWGN channels. Use that estimator unless you have a way to guess or estimate these values here.
Original paper: R. Matzner, "An SNR estimation algorithm for complex baseband signal using higher order statistics," Facta Universitatis (Nis), no. 6, pp. 41-52, 1993.
Reference used in derivation: 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_snr_est_m2m4::digital_impl_snr_est_m2m4 | ( | double | alpha, |
| double | ka, | ||
| double | kw | ||
| ) |
Constructor
Parameters:
- Parameters:
-
alpha,: the update rate of internal running average calculations. ka,: estimate of the signal kurtosis (1 for PSK) kw,: estimate of the channel noise kurtosis (2 for AWGN)
| digital_impl_snr_est_m2m4::~digital_impl_snr_est_m2m4 | ( | ) | [inline] |
Member Function Documentation
| double digital_impl_snr_est_m2m4::snr | ( | ) | [virtual] |
Use the register values to compute a new estimate.
Reimplemented from digital_impl_mpsk_snr_est.
| int digital_impl_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:
