A block for computing SNR of a signal. More...
#include <mpsk_snr_est_cc.h>
Public Types | |
| typedef boost::shared_ptr < mpsk_snr_est_cc > | sptr |
Public Member Functions | |
| virtual double | snr ()=0 |
| Return the estimated signal-to-noise ratio in decibels. | |
| virtual snr_est_type_t | type () const =0 |
| Return the type of estimator in use. | |
| virtual int | tag_nsample () const =0 |
| Return how many samples between SNR tags. | |
| virtual double | alpha () const =0 |
| Get the running-average coefficient. | |
| virtual void | set_type (snr_est_type_t t)=0 |
| Set type of estimator to use. | |
| virtual void | set_tag_nsample (int n)=0 |
| Set the number of samples between SNR tags. | |
| virtual void | set_alpha (double alpha)=0 |
| Set the running-average coefficient. | |
Static Public Member Functions | |
| static sptr | make (snr_est_type_t type, int tag_nsamples=10000, double alpha=0.001) |
Detailed Description
A block for computing SNR of a signal.
This block can be used to monitor and retrieve estimations of the signal SNR. It is designed to work in a flowgraph and passes all incoming data along to its output.
The block is designed for use with M-PSK signals especially. The type of estimator is specified as the type parameter in the constructor. The estimators tend to trade off performance for accuracy, although experimentation should be done to figure out the right approach for a given implementation. Further, the current set of estimators are designed and proven theoretically under AWGN conditions; some amount of error should be assumed and/or estimated for real channel conditions.
Member Typedef Documentation
Member Function Documentation
| virtual double gr::digital::mpsk_snr_est_cc::alpha | ( | ) | const [pure virtual] |
Get the running-average coefficient.
| static sptr gr::digital::mpsk_snr_est_cc::make | ( | snr_est_type_t | type, |
| int | tag_nsamples = 10000, |
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| double | alpha = 0.001 |
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| ) | [static] |
Factory function returning shared pointer of this class
- Parameters:
-
type,: the type of estimator to use gr::digital::snr_est_type_t "snr_est_type_t" for details about the available types tag_nsamples,: after this many samples, a tag containing the SNR (key='snr') will be sent alpha,: the update rate of internal running average calculations
| virtual void gr::digital::mpsk_snr_est_cc::set_alpha | ( | double | alpha | ) | [pure virtual] |
Set the running-average coefficient.
| virtual void gr::digital::mpsk_snr_est_cc::set_tag_nsample | ( | int | n | ) | [pure virtual] |
Set the number of samples between SNR tags.
| virtual void gr::digital::mpsk_snr_est_cc::set_type | ( | snr_est_type_t | t | ) | [pure virtual] |
Set type of estimator to use.
| virtual double gr::digital::mpsk_snr_est_cc::snr | ( | ) | [pure virtual] |
Return the estimated signal-to-noise ratio in decibels.
| virtual int gr::digital::mpsk_snr_est_cc::tag_nsample | ( | ) | const [pure virtual] |
Return how many samples between SNR tags.
| virtual snr_est_type_t gr::digital::mpsk_snr_est_cc::type | ( | ) | const [pure virtual] |
Return the type of estimator in use.
The documentation for this class was generated from the following file:
