gr::fec::code::polar_encoder_systematic Class Reference

systematic POLAR encoder for basic details see 'polar_common' class. More...

#include <gnuradio/fec/polar_encoder_systematic.h>

Public Member Functions
void	generic_work (void *in_buffer, void *out_buffer)
double	rate ()
int	get_input_size ()
int	get_output_size ()
bool	set_frame_size (unsigned int frame_size)
	~polar_encoder_systematic ()
Public Member Functions inherited from gr::fec::generic_encoder
int	unique_id ()
std::string	alias ()
virtual const char *	get_input_conversion ()
virtual const char *	get_output_conversion ()
	generic_encoder (void)
	generic_encoder (std::string name)
virtual	~generic_encoder ()
Public Member Functions inherited from gr::fec::code::polar_common
	polar_common (int block_size, int num_info_bits, std::vector< int > frozen_bit_positions, std::vector< char > frozen_bit_values)
	~polar_common ()

Static Public Member Functions
static generic_encoder::sptr	make (int block_size, int num_info_bits, std::vector< int > frozen_bit_positions)

Additional Inherited Members
Public Types inherited from gr::fec::generic_encoder
typedef boost::shared_ptr< generic_encoder >	sptr
Public Attributes inherited from gr::fec::generic_encoder
int	my_id
std::string	d_name
Static Public Attributes inherited from gr::fec::generic_encoder
static int	base_unique_id
Protected Member Functions inherited from gr::fec::code::polar_common
const int	block_size () const
const int	block_power () const
const int	num_info_bits () const
long	bit_reverse (long value, int active_bits) const
void	print_packed_bit_array (const unsigned char *printed_array, const int num_bytes) const
void	print_unpacked_bit_array (const unsigned char *bits, const unsigned int num_bytes) const
void	setup_info_bit_positions_reversed ()
void	setup_volk_vectors ()
void	volk_encode (unsigned char *out_buf, const unsigned char *in_buf)
void	volk_encode_block (unsigned char *out_buf, unsigned char *in_buf)
Protected Attributes inherited from gr::fec::generic_encoder
gr::logger_ptr	d_logger
Protected Attributes inherited from gr::fec::code::polar_common
std::vector< int >	d_frozen_bit_positions
std::vector< char >	d_frozen_bit_values
std::vector< int >	d_info_bit_positions
std::vector< int >	d_info_bit_positions_reversed
unsigned char *	d_volk_temp
unsigned char *	d_volk_frozen_bit_mask
unsigned char *	d_volk_frozen_bits

Detailed Description

systematic POLAR encoder for basic details see 'polar_common' class.

expects values with MSB first. It needs a full information word and encodes it in one pass. Output is a codeword of block_size.

Systematic encoding indicates that the info bit values are present in the codeword. 'info_bit_positions' may be obtained by ordering all non frozen_bit_positions in increasing order. One may extract them at their positions after a bit reversal operation. encoder -> decoder chain would need additional bit-reversal after encoding + before decoding. This is unnecessary.

Constructor & Destructor Documentation

~polar_encoder_systematic()

gr::fec::code::polar_encoder_systematic::~polar_encoder_systematic

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Member Function Documentation

generic_work()

void gr::fec::code::polar_encoder_systematic::generic_work ( void *  in_buffer, void *  out_buffer  )

virtual

Implements gr::fec::generic_encoder.

get_input_size()

int gr::fec::code::polar_encoder_systematic::get_input_size ( )

inlinevirtual

Returns the input size in items that the encoder object uses to encode a full frame. Often, this number is the number of bits per frame if the input format is unpacked. If the block expects packed bytes, then this value should be the number of bytes (number of bits / 8) per input frame.

The child class MUST implement this function.

Implements gr::fec::generic_encoder.

get_output_size()

int gr::fec::code::polar_encoder_systematic::get_output_size ( )

inlinevirtual

Returns the output size in items that the encoder object produces after encoding a full frame. Often, this number is the number of bits in the outputted frame if the input format is unpacked. If the block produces packed bytes, then this value should be the number of bytes (number of bits / 8) per frame produced. This value is generally something like R*get_input_size() for a 1/R rate code.

The child class MUST implement this function.

Implements gr::fec::generic_encoder.

make()

static generic_encoder::sptr gr::fec::code::polar_encoder_systematic::make ( int  block_size, int  num_info_bits, std::vector< int >  frozen_bit_positions  )

static

Factory for a polar code encoder object.

Parameters

block_size	defines the codeword size. It MUST be a power of 2.
num_info_bits	represents the number of information bits in a block. Also called frame_size.
frozen_bit_positions	is an integer vector which defines the position of all frozen bits in a block. Its size MUST be equal to block_size - num_info_bits. Also it must be sorted and every position must only occur once. Frozen bit values will be set to ZERO!

rate()

double gr::fec::code::polar_encoder_systematic::rate ( )

inlinevirtual

Returns the rate of the code. For every 1 input bit, there are r output bits, so the rate is 1/r. Used for setting things like the encoder block's relative rate.

This function MUST be reimplemented by the child class.

Implements gr::fec::generic_encoder.

set_frame_size()

bool gr::fec::code::polar_encoder_systematic::set_frame_size ( unsigned int  frame_size )

inlinevirtual

Updates the size of the frame to encode.

The child class MUST implement this function and interpret how the frame_size information affects the block's behavior. It should also provide bounds checks.

Implements gr::fec::generic_encoder.

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

• polar_encoder_systematic.h