GNU Radio 3.6.2 C++ API
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A probe for computing SNR of a signal. More...
#include <digital_probe_mpsk_snr_est_c.h>
Public Member Functions | |
~digital_probe_mpsk_snr_est_c () | |
int | work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) |
just like gr_block::general_work, only this arranges to call consume_each for you | |
double | snr () |
Return the estimated signal-to-noise ratio in decibels. | |
snr_est_type_t | type () const |
Return the type of estimator in use. | |
int | msg_nsample () const |
Return how many samples between SNR messages. | |
double | alpha () const |
Get the running-average coefficient. | |
void | set_type (snr_est_type_t t) |
Set type of estimator to use. | |
void | set_msg_nsample (int n) |
Set the number of samples between SNR messages. | |
void | set_alpha (double alpha) |
Set the running-average coefficient. | |
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void | forecast (int noutput_items, gr_vector_int &ninput_items_required) |
Estimate input requirements given output request. | |
int | general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) |
compute output items from input items | |
int | fixed_rate_ninput_to_noutput (int ninput) |
Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. | |
int | fixed_rate_noutput_to_ninput (int noutput) |
Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. | |
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virtual | ~gr_block () |
unsigned | history () const |
void | set_history (unsigned history) |
bool | fixed_rate () const |
Return true if this block has a fixed input to output rate. | |
virtual bool | start () |
Called to enable drivers, etc for i/o devices. | |
virtual bool | stop () |
Called to disable drivers, etc for i/o devices. | |
void | set_output_multiple (int multiple) |
Constrain the noutput_items argument passed to forecast and general_work. | |
int | output_multiple () const |
bool | output_multiple_set () const |
void | set_alignment (int multiple) |
Constrains buffers to work on a set item alignment (for SIMD) | |
int | alignment () const |
void | set_unaligned (int na) |
int | unaligned () const |
void | set_is_unaligned (bool u) |
bool | is_unaligned () const |
void | consume (int which_input, int how_many_items) |
Tell the scheduler how_many_items of input stream which_input were consumed. | |
void | consume_each (int how_many_items) |
Tell the scheduler how_many_items were consumed on each input stream. | |
void | produce (int which_output, int how_many_items) |
Tell the scheduler how_many_items were produced on output stream which_output . | |
void | set_relative_rate (double relative_rate) |
Set the approximate output rate / input rate. | |
double | relative_rate () const |
return the approximate output rate / input rate | |
uint64_t | nitems_read (unsigned int which_input) |
Return the number of items read on input stream which_input. | |
uint64_t | nitems_written (unsigned int which_output) |
Return the number of items written on output stream which_output. | |
tag_propagation_policy_t | tag_propagation_policy () |
Asks for the policy used by the scheduler to moved tags downstream. | |
void | set_tag_propagation_policy (tag_propagation_policy_t p) |
Set the policy by the scheduler to determine how tags are moved downstream. | |
gr_block_detail_sptr | detail () const |
void | set_detail (gr_block_detail_sptr detail) |
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virtual | ~gr_basic_block () |
long | unique_id () const |
std::string | name () const |
gr_io_signature_sptr | input_signature () const |
gr_io_signature_sptr | output_signature () const |
gr_basic_block_sptr | to_basic_block () |
virtual bool | check_topology (int ninputs, int noutputs) |
Confirm that ninputs and noutputs is an acceptable combination. | |
template<typename T > | |
void | set_msg_handler (T msg_handler) |
Set the callback that is fired when messages are available. | |
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gr_msg_accepter () | |
~gr_msg_accepter () | |
void | post (pmt::pmt_t msg) |
send msg to msg_accepter | |
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msg_accepter () | |
virtual | ~msg_accepter () |
Friends | |
DIGITAL_API digital_probe_mpsk_snr_est_c_sptr | digital_make_probe_mpsk_snr_est_c (snr_est_type_t type, int msg_nsamples, double alpha) |
Additional Inherited Members | |
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enum | { WORK_CALLED_PRODUCE = -2, WORK_DONE = -1 } |
Magic return values from general_work. More... | |
enum | tag_propagation_policy_t { TPP_DONT = 0, TPP_ALL_TO_ALL = 1, TPP_ONE_TO_ONE = 2 } |
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enum | vcolor { WHITE, GREY, BLACK } |
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gr_sync_block (void) | |
gr_sync_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature) | |
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std::string | d_name |
gr_io_signature_sptr | d_input_signature |
gr_io_signature_sptr | d_output_signature |
long | d_unique_id |
vcolor | d_color |
A probe for computing SNR of a signal.
This is a probe block (a sink) that can be used to monitor and retrieve estimations of the signal SNR. This probe 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.
digital_probe_mpsk_snr_est_c::~digital_probe_mpsk_snr_est_c | ( | ) |
double digital_probe_mpsk_snr_est_c::alpha | ( | ) | const |
Get the running-average coefficient.
int digital_probe_mpsk_snr_est_c::msg_nsample | ( | ) | const |
Return how many samples between SNR messages.
void digital_probe_mpsk_snr_est_c::set_alpha | ( | double | alpha | ) |
Set the running-average coefficient.
void digital_probe_mpsk_snr_est_c::set_msg_nsample | ( | int | n | ) |
Set the number of samples between SNR messages.
void digital_probe_mpsk_snr_est_c::set_type | ( | snr_est_type_t | t | ) |
Set type of estimator to use.
double digital_probe_mpsk_snr_est_c::snr | ( | ) |
Return the estimated signal-to-noise ratio in decibels.
snr_est_type_t digital_probe_mpsk_snr_est_c::type | ( | ) | const |
Return the type of estimator in use.
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virtual |
just like gr_block::general_work, only this arranges to call consume_each for you
The user must override work to define the signal processing code
Implements gr_sync_block.
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friend |
Factory function returning shared pointer of this class
Parameters: \param type: the type of estimator to use \ref ref_snr_est_types "snr_est_type_t" for details about the available types. \param msg_nsamples: [not implemented yet] after this many samples, a message containing the SNR (key='snr') will be sent \param alpha: the update rate of internal running average calculations.