gr::digital::constellation_qpsk Class Reference

Digital constellation for QPSK. More...

#include <gnuradio/digital/constellation.h>

Public Types
typedef boost::shared_ptr< constellation_qpsk >	sptr

Public Member Functions
	~constellation_qpsk ()
unsigned int	decision_maker (const gr_complex *sample)
	Returns the constellation point that matches best. More...
Public Member Functions inherited from gr::digital::constellation
	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. More...
std::vector< gr_complex >	map_to_points_v (unsigned int value)
unsigned int	decision_maker_v (std::vector< gr_complex > sample)
	Takes a vector rather than a pointer. Better for SWIG wrapping. More...
unsigned int	decision_maker_pe (const gr_complex *sample, float *phase_error)
	Also calculates the phase error. More...
virtual void	calc_metric (const gr_complex *sample, float *metric, gr::digital::trellis_metric_type_t type)
	Calculates distance. More...
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_complex >	points ()
	Returns the set of points in this constellation. More...
std::vector< gr_complex >	s_points ()
	Returns the vector of points in this constellation. Raise error if dimensionality is not one. More...
std::vector< std::vector< gr_complex > >	v_points ()
	Returns a vector of vectors of points. More...
bool	apply_pre_diff_code ()
	Whether to apply an encoding before doing differential encoding. (e.g. gray coding) More...
void	set_pre_diff_code (bool a)
	Whether to apply an encoding before doing differential encoding. (e.g. gray coding) More...
std::vector< int >	pre_diff_code ()
	Returns the encoding to apply before differential encoding. More...
unsigned int	rotational_symmetry ()
	Returns the order of rotational symmetry. More...
unsigned int	dimensionality ()
	Returns the number of complex numbers in a single symbol. More...
unsigned int	bits_per_symbol ()
unsigned int	arity ()
constellation_sptr	base ()
pmt::pmt_t	as_pmt ()
void	gen_soft_dec_lut (int precision, float npwr=1.0)
	Generates the soft decision LUT based on constellation and symbol map. More...
virtual std::vector< float >	calc_soft_dec (gr_complex sample, float npwr=1.0)
	Calculate soft decisions for the given sample. More...
void	set_soft_dec_lut (const std::vector< std::vector< float > > &soft_dec_lut, int precision)
	Define a soft decision look-up table. More...
bool	has_soft_dec_lut ()
	Returns True if the soft decision LUT has been defined, False otherwise. More...
std::vector< std::vector< float > >	soft_dec_lut ()
std::vector< float >	soft_decision_maker (gr_complex sample)
	Returns the soft decisions for the given sample. More...

Static Public Member Functions
static sptr	make ()

Protected Member Functions
	constellation_qpsk ()
Protected Member Functions inherited from gr::digital::constellation
float	get_distance (unsigned int index, const gr_complex *sample)
unsigned int	get_closest_point (const gr_complex *sample)
void	calc_arity ()
void	max_min_axes ()

Additional Inherited Members
Protected Attributes inherited from gr::digital::constellation
std::vector< gr_complex >	d_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. More...
float	d_re_min
float	d_re_max
float	d_im_min
float	d_im_max
std::vector< std::vector< float > >	d_soft_dec_lut
int	d_lut_precision
float	d_lut_scale

Detailed Description

Digital constellation for QPSK.

Constellation diagram assumes little endian format e.g. top, left means 2 not 1.

01 | 11
-------
00 | 10

Member Typedef Documentation

typedef boost::shared_ptr<constellation_qpsk> gr::digital::constellation_qpsk::sptr

Constructor & Destructor Documentation

gr::digital::constellation_qpsk::~constellation_qpsk

(

)

gr::digital::constellation_qpsk::constellation_qpsk ( )

protected

Member Function Documentation

unsigned int gr::digital::constellation_qpsk::decision_maker ( const gr_complex *  sample )

virtual

Returns the constellation point that matches best.

Implements gr::digital::constellation.

static sptr gr::digital::constellation_qpsk::make ( )

static

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

• constellation.h