gr::fec::code::ldpc_G_matrix Class Reference

Class for storing H or G matrix. More...

#include <gnuradio/fec/ldpc_G_matrix.h>

Public Types
typedef boost::shared_ptr< ldpc_G_matrix >	sptr

Public Member Functions
virtual void	encode (unsigned char *outbuffer, const unsigned char *inbuffer) const =0
	Encode inbuffer with LDPC H matrix into outbuffer. More...
virtual void	decode (unsigned char *outbuffer, const float *inbuffer, unsigned int frame_size, unsigned int max_iterations) const =0
	Decode inbuffer with LDPC H matrix into outbuffer. More...
Public Member Functions inherited from gr::fec::code::fec_mtrx
virtual	~fec_mtrx ()
virtual unsigned int	n () const =0
	Get the codeword length n. More...
virtual unsigned int	k () const =0
	Get the information word length k. More...

Static Public Member Functions
static sptr	make (const std::string filename)
	Constructor given alist file. More...

Additional Inherited Members
Protected Member Functions inherited from gr::fec::code::fec_mtrx
	fec_mtrx (void)

Detailed Description

Class for storing H or G matrix.

This class stores a matrix variable, specifically either a:

1) Generator matrix, G, in the standard format G = [I P], where I is an identity matrix and P is the parity submatrix.

or

2) Parity matrix, H, in the standard format H = [P' I], where P' is the transpose of the parity submatrix and I is an identity matrix.

This variable can used by the ldpc_gen_mtrx_encoder and ldpc_bit_flip_decoder classes.

Member Typedef Documentation

sptr

typedef boost::shared_ptr<ldpc_G_matrix> gr::fec::code::ldpc_G_matrix::sptr

Member Function Documentation

decode()

virtual void gr::fec::code::ldpc_G_matrix::decode ( unsigned char *  outbuffer, const float *  inbuffer, unsigned int  frame_size, unsigned int  max_iterations  ) const

pure virtual

Decode inbuffer with LDPC H matrix into outbuffer.

Implements gr::fec::code::fec_mtrx.

encode()

virtual void gr::fec::code::ldpc_G_matrix::encode ( unsigned char *  outbuffer, const unsigned char *  inbuffer  ) const

pure virtual

Encode inbuffer with LDPC H matrix into outbuffer.

Implements gr::fec::code::fec_mtrx.

make()

static sptr gr::fec::code::ldpc_G_matrix::make ( const std::string  filename )

static

Constructor given alist file.

1. Reads in the matrix from an alist file
2. Determines if the matrix format is G=[I P] or H=[P' I]
3. Solves for G transpose (will be used during encoding)

Parameters

filename

Name of an alist file to use. The alist format is described at: http://www.inference.phy.cam.ac.uk/mackay/codes/alist.html

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

• ldpc_G_matrix.h