simthlib::Sova Class Reference

#include <sova.h>

Inheritance diagram for simthlib::Sova:

[legend]List of all members.

Public Member Functions
	Sova (std::auto_ptr< simthlib::Trellis > usedTrellis)
virtual	~Sova ()
	destructor
void	softout4Output (const simth::LlvSeq &metr, simth::LlrSeq *softout, const simth::LlrSeq *apri=NULL)
void	softout4Input (const simth::LlvSeq &metr, simth::LlrSeq *softout, const simth::LlrSeq *apri=NULL)
void	decode (const simth::LlvSeq &metr, simth::BitSeq *bs, const simth::LlrSeq *apri=NULL)
virtual void	print (std::ostream &os) const
Protected Types
enum	OutputMode { OM_DATA, OM_CODED }
	SOVA determines soft info for coded or for data bits/symbols:. More...
Protected Member Functions
virtual void	Forward (const simth::LlvSeq &symllv, bool setSoftout, const simth::LlrSeq *apri=NULL)
virtual void	Backward (simth::BitSeq *bs)
virtual void	Backward (simth::LlrSeq *llr, OutputMode outMode)
Protected Attributes
double *	metric
	array of metric increments for each path
double *	new_metric
	array of new metric increments for each path for the next step
simth::Array2d< simthlib::TrellisPath >	paths
	path memory (2D - array)

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Detailed Description

This class provides a Softoutp Viterbi Algorithm, so called SOVA. For further information see 'A Viterbi algorithm with soft-decision outputs and its aplications.' from Hagenauer and Hoeher in Globecom, Dallas, USA, Nov 1989.

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Member Enumeration Documentation

enum simthlib::Sova::OutputMode [protected]

SOVA determines soft info for coded or for data bits/symbols:. Enumeration values: OM_DATA  OM_CODED

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Constructor & Destructor Documentation

simthlib::Sova::Sova (  std::auto_ptr< simthlib::Trellis >  usedTrellis  )

Class constructor.

virtual simthlib::Sova::~Sova (   )  [virtual]

destructor

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Member Function Documentation

virtual void simthlib::Sova::Backward (  simth::LlrSeq *  llr, OutputMode  outMode )  [protected, virtual]

reads and returns soft outputs for the data sequence belonging to the previously determined path with the best metric

virtual void simthlib::Sova::Backward (  simth::BitSeq *  bs  )  [protected, virtual]

reads and returns the data sequence belonging to the previously determined path with the best metric

void simthlib::Sova::decode (  const simth::LlvSeq &  metr, simth::BitSeq *  bs, const simth::LlrSeq *  apri = NULL )  [virtual]

Decoding by the means of Viterbi algorithm. Implements simthlib::TrellisSoftoutAlgorithm.

virtual void simthlib::Sova::Forward (  const simth::LlvSeq &  symllv, bool  setSoftout, const simth::LlrSeq *  apri = NULL )  [protected, virtual]

finds all paths and calculates the corresponding metrics according to the Viterbi algorithm

virtual void simthlib::Sova::print (  std::ostream &  os  )  const [virtual]

void simthlib::Sova::softout4Input (  const simth::LlvSeq &  metr, simth::LlrSeq *  softout, const simth::LlrSeq *  apri = NULL )  [virtual]

Computes soft-output information by the means of SOVA for the coded bits. Implements simthlib::TrellisSoftoutAlgorithm.

void simthlib::Sova::softout4Output (  const simth::LlvSeq &  metr, simth::LlrSeq *  softout, const simth::LlrSeq *  apri = NULL )  [virtual]

Computes soft-output information by the means of SOVA for the information bits. Implements simthlib::TrellisSoftoutAlgorithm.

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Member Data Documentation

double* simthlib::Sova::metric [protected]

array of metric increments for each path

double* simthlib::Sova::new_metric [protected]

array of new metric increments for each path for the next step

simth::Array2d<simthlib::TrellisPath> simthlib::Sova::paths [protected]

path memory (2D - array)

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