GNU Radio 3.7.1 C++ API
gr::digital::constellation Class Reference

An abstracted constellation object. More...

#include <constellation.h>

Inheritance diagram for gr::digital::constellation:

List of all members.

Public Member Functions

 constellation (std::vector< gr_complex > constell, std::vector< int > pre_diff_code, unsigned int rotational_symmetry, unsigned int dimensionality)
 constellation ()
virtual ~constellation ()
void map_to_points (unsigned int value, gr_complex *points)
 Returns the constellation points for a symbol value.
std::vector< gr_complexmap_to_points_v (unsigned int value)
virtual unsigned int decision_maker (const gr_complex *sample)=0
 Returns the constellation point that matches best.
unsigned int decision_maker_v (std::vector< gr_complex > sample)
 Takes a vector rather than a pointer. Better for SWIG wrapping.
unsigned int decision_maker_pe (const gr_complex *sample, float *phase_error)
 Also calculates the phase error.
virtual void calc_metric (const gr_complex *sample, float *metric, gr::digital::trellis_metric_type_t type)
 Calculates distance.
virtual void calc_euclidean_metric (const gr_complex *sample, float *metric)
virtual void calc_hard_symbol_metric (const gr_complex *sample, float *metric)
std::vector< gr_complexpoints ()
 Returns the set of points in this constellation.
std::vector< gr_complexs_points ()
 Returns the vector of points in this constellation. Raise error if dimensionality is not one.
std::vector< std::vector
< gr_complex > > 
v_points ()
 Returns a vector of vectors of points.
bool apply_pre_diff_code ()
 Whether to apply an encoding before doing differential encoding. (e.g. gray coding)
void set_pre_diff_code (bool a)
 Whether to apply an encoding before doing differential encoding. (e.g. gray coding)
std::vector< int > pre_diff_code ()
 Returns the encoding to apply before differential encoding.
unsigned int rotational_symmetry ()
 Returns the order of rotational symmetry.
unsigned int dimensionality ()
 Returns the number of complex numbers in a single symbol.
unsigned int bits_per_symbol ()
unsigned int arity ()
constellation_sptr base ()

Protected Member Functions

float get_distance (unsigned int index, const gr_complex *sample)
unsigned int get_closest_point (const gr_complex *sample)
void calc_arity ()

Protected Attributes

std::vector< gr_complexd_constellation
std::vector< int > d_pre_diff_code
bool d_apply_pre_diff_code
unsigned int d_rotational_symmetry
unsigned int d_dimensionality
unsigned int d_arity
float d_scalefactor
 The factor by which the user given constellation points were scaled by to achieve an average amplitude of 1.

Detailed Description

An abstracted constellation object.

The constellation objects hold the necessary information to pass around constellation information for modulators and demodulators. These objects contain the mapping between the bits and the constellation points used to represent them as well as methods for slicing the symbol space. Various implementations are possible for efficiency and ease of use.

Standard constellations (BPSK, QPSK, QAM, etc) can be inherited from this class and overloaded to perform optimized slicing and constellation mappings.


Constructor & Destructor Documentation

gr::digital::constellation::constellation ( std::vector< gr_complex constell,
std::vector< int >  pre_diff_code,
unsigned int  rotational_symmetry,
unsigned int  dimensionality 
)

Member Function Documentation

Whether to apply an encoding before doing differential encoding. (e.g. gray coding)

unsigned int gr::digital::constellation::arity ( ) [inline]
virtual void gr::digital::constellation::calc_euclidean_metric ( const gr_complex sample,
float *  metric 
) [virtual]
virtual void gr::digital::constellation::calc_hard_symbol_metric ( const gr_complex sample,
float *  metric 
) [virtual]
virtual void gr::digital::constellation::calc_metric ( const gr_complex sample,
float *  metric,
gr::digital::trellis_metric_type_t  type 
) [virtual]

Calculates distance.

Calculates metrics for all points in the constellation. For use with the viterbi algorithm.

unsigned int gr::digital::constellation::decision_maker_pe ( const gr_complex sample,
float *  phase_error 
)

Also calculates the phase error.

unsigned int gr::digital::constellation::decision_maker_v ( std::vector< gr_complex sample)

Takes a vector rather than a pointer. Better for SWIG wrapping.

unsigned int gr::digital::constellation::dimensionality ( ) [inline]

Returns the number of complex numbers in a single symbol.

unsigned int gr::digital::constellation::get_closest_point ( const gr_complex sample) [protected]
float gr::digital::constellation::get_distance ( unsigned int  index,
const gr_complex sample 
) [protected]
void gr::digital::constellation::map_to_points ( unsigned int  value,
gr_complex points 
)

Returns the constellation points for a symbol value.

std::vector<gr_complex> gr::digital::constellation::map_to_points_v ( unsigned int  value)

Returns the set of points in this constellation.

std::vector<int> gr::digital::constellation::pre_diff_code ( ) [inline]

Returns the encoding to apply before differential encoding.

Returns the order of rotational symmetry.

Returns the vector of points in this constellation. Raise error if dimensionality is not one.

Whether to apply an encoding before doing differential encoding. (e.g. gray coding)

std::vector<std::vector<gr_complex> > gr::digital::constellation::v_points ( )

Returns a vector of vectors of points.


Member Data Documentation

unsigned int gr::digital::constellation::d_arity [protected]
std::vector<int> gr::digital::constellation::d_pre_diff_code [protected]

The factor by which the user given constellation points were scaled by to achieve an average amplitude of 1.


The documentation for this class was generated from the following file: