digital_impl_mpsk_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_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:
