A Configurable Maximum Likelihood Sequence Estimator Class. More...

#include <mle.h>

Collaboration diagram for SPUC::mle< Numeric >:

Public Member Functions
	mle (int mlsd_size, int dfe_size=0, long q=1)
	phase increment for MLSD_CPM (should divide evenly into 360 degrees) (not implemented) More...

	~mle (void)

void	reset ()
	Reset filter. More...

void	update_taps_lms (Numeric err)
	Update coefficients. More...

Numeric	tap0 (void)
	Get tap0. More...

void	set_cir (const fir< Numeric, Numeric > &cir)
	Copy channel impulse response. More...

Numeric	df_est (int state)

Numeric	ff_estimate (long seq)
	Feedforward estimates. More...

float_type	estimate (Numeric rx, long seq, long state, long type)
	Allows selection of Equalizer type. More...

long	ddfse (Numeric rx)
	Perform DDFSE Sequence detection. More...

long	mlsd (Numeric rx)
	Perform MLSD Sequence detection. More...

long	rsdfse (Numeric rx)
	Perform RSDFSE Sequence detection. More...

long	equalize (Numeric rx, long type)
	Generic Sequence detection allowing selection of type. More...

Public Attributes
const long	mlsd_span

const long	dfe_span
	number of bits spanned by MLSD part of equaliser More...

const long	n_states
	Number of bits spanned by DFE part of equaliser. More...

const long	n_branches
	Number of states. More...

Numeric	fb_est
	Number of branches. More...

fir_adapt< Numeric, Numeric >	cfir
	Feedback estimator for RSDFSE. More...

std::vector< Numeric >	cir_mlsd
	Channel impulse response. More...

std::vector< Numeric >	cir_dfe

std::vector< Numeric >	f_est

std::vector< Numeric >	b_est
	Feedforward. More...

std::vector< float_type >	weight

std::vector< long >	path
	state metric calculations/state More...

std::vector< long >	tmp_path
	path history More...

std::vector< float_type >	tmp_weight

std::vector< long >	path_symbol

long	phase_states

long	total_states
	Phase states for MLSD_CPM (not implemented) More...

float_type	phase_inc
	for CPM total = n_states*phase_states! (not implemented) More...

Detailed Description

template<class Numeric>
class SPUC::mle< Numeric >

A Configurable Maximum Likelihood Sequence Estimator Class.

can be configured as either a

MLSD - Basic Maximum Likelihood Sequence Detector

DDFSE - MLSD with Delayed Decision Feedback Sequence Detector

RSDFSE - MLSD with Reduced State Decision Feedback Sequence Detector

Author: Tony Kirke; Tony Kirke

Constructor & Destructor Documentation

template<class Numeric>

SPUC::mle< Numeric >::mle	(	int	mlsd_size,
		int	dfe_size = `0`,
		long	q = `1`
	)

inline

phase increment for MLSD_CPM (should divide evenly into 360 degrees) (not implemented)

Constructor (default to MLSE with no feedback) q=1 Binary, q=2 Quaternary

References SPUC::mle< Numeric >::n_states, and SPUC::fir< Numeric, Coeff >::set_size().

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template<class Numeric>

SPUC::mle< Numeric >::~mle ( void )

inline

Member Function Documentation

template<class Numeric>

long SPUC::mle< Numeric >::ddfse ( Numeric rx )

inline

Perform DDFSE Sequence detection.

References SPUC::mle< Numeric >::equalize().

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template<class Numeric>

Numeric SPUC::mle< Numeric >::df_est ( int state )

inline

Calculate convolution of feedback taps with past decisions for a particular state (for next iteration of branch metric calculation)

References SPUC::mle< Numeric >::dfe_span.

Referenced by SPUC::mle< Numeric >::equalize().

template<class Numeric>

long SPUC::mle< Numeric >::equalize	(	Numeric	rx,
		long	type
	)

inline

Generic Sequence detection allowing selection of type.

References SPUC::mle< Numeric >::df_est(), SPUC::mle< Numeric >::estimate(), and SPUC::mle< Numeric >::n_states.

Referenced by SPUC::mle< Numeric >::ddfse(), SPUC::mle< Numeric >::mlsd(), and SPUC::mle< Numeric >::rsdfse().

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template<class Numeric>

float_type SPUC::mle< Numeric >::estimate	(	Numeric	rx,
		long	seq,
		long	state,
		long	type
	)

inline

Allows selection of Equalizer type.

References SPUC::mle< Numeric >::fb_est, SPUC::mle< Numeric >::ff_estimate(), and SPUC::magsq().

Referenced by SPUC::mle< Numeric >::equalize().

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template<class Numeric>

Numeric SPUC::mle< Numeric >::ff_estimate ( long seq )

inline

Feedforward estimates.

References SPUC::fir< Numeric, Coeff >::coeff, and SPUC::mle< Numeric >::mlsd_span.

Referenced by SPUC::mle< Numeric >::estimate().

template<class Numeric>

long SPUC::mle< Numeric >::mlsd ( Numeric rx )

inline

Perform MLSD Sequence detection.

References SPUC::mle< Numeric >::equalize().

Referenced by main(), and SPUC::baud_eq_env< Numeric >::step().

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template<class Numeric>

void SPUC::mle< Numeric >::reset ( void )

inline

Reset filter.

References SPUC::fir_adapt< Numeric, Coeff >::reset().

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template<class Numeric>

long SPUC::mle< Numeric >::rsdfse ( Numeric rx )

inline

Perform RSDFSE Sequence detection.

References SPUC::mle< Numeric >::equalize().

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template<class Numeric>

void SPUC::mle< Numeric >::set_cir ( const fir< Numeric, Numeric > & cir )

inline

Copy channel impulse response.

References SPUC::fir< Numeric, Coeff >::coeff, SPUC::mle< Numeric >::dfe_span, SPUC::mle< Numeric >::mlsd_span, and SPUC::fir< Numeric, Coeff >::num_taps.

Referenced by SPUC::baud_eq_env< Numeric >::loop_init().

template<class Numeric>

Numeric SPUC::mle< Numeric >::tap0 ( void )

inline

Get tap0.

References SPUC::fir< Numeric, Coeff >::coeff.

template<class Numeric>

void SPUC::mle< Numeric >::update_taps_lms ( Numeric err )

inline

Update coefficients.

References SPUC::fir_adapt< Numeric, Coeff >::update_lms().

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Member Data Documentation

template<class Numeric>

std::vector<Numeric> SPUC::mle< Numeric >::b_est

Feedforward.

template<class Numeric>

fir_adapt< Numeric, Numeric > SPUC::mle< Numeric >::cfir

Feedback estimator for RSDFSE.

Referenced by main().

template<class Numeric>

std::vector<Numeric> SPUC::mle< Numeric >::cir_dfe

template<class Numeric>

std::vector<Numeric> SPUC::mle< Numeric >::cir_mlsd

Channel impulse response.

template<class Numeric>

const long SPUC::mle< Numeric >::dfe_span

number of bits spanned by MLSD part of equaliser

Referenced by SPUC::mle< Numeric >::df_est(), and SPUC::mle< Numeric >::set_cir().

template<class Numeric>

std::vector<Numeric> SPUC::mle< Numeric >::f_est

template<class Numeric>

Numeric SPUC::mle< Numeric >::fb_est

Number of branches.

Referenced by SPUC::mle< Numeric >::estimate().

template<class Numeric>

const long SPUC::mle< Numeric >::mlsd_span

Referenced by SPUC::mle< Numeric >::ff_estimate(), and SPUC::mle< Numeric >::set_cir().

template<class Numeric>

const long SPUC::mle< Numeric >::n_branches

Number of states.

template<class Numeric>

const long SPUC::mle< Numeric >::n_states

Number of bits spanned by DFE part of equaliser.

Referenced by SPUC::mle< Numeric >::equalize(), and SPUC::mle< Numeric >::mle().

template<class Numeric>

std::vector<long> SPUC::mle< Numeric >::path

state metric calculations/state

template<class Numeric>

std::vector<long> SPUC::mle< Numeric >::path_symbol

template<class Numeric>

float_type SPUC::mle< Numeric >::phase_inc

for CPM total = n_states*phase_states! (not implemented)

template<class Numeric>

long SPUC::mle< Numeric >::phase_states

template<class Numeric>

std::vector<long> SPUC::mle< Numeric >::tmp_path

path history

template<class Numeric>

std::vector<float_type> SPUC::mle< Numeric >::tmp_weight

template<class Numeric>

long SPUC::mle< Numeric >::total_states

Phase states for MLSD_CPM (not implemented)

template<class Numeric>

std::vector<float_type> SPUC::mle< Numeric >::weight

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

mle.h

Public Member Functions

Public Attributes

Detailed Description

template<class Numeric> class SPUC::mle< Numeric >

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

template<class Numeric>
class SPUC::mle< Numeric >