gr::filter::adaptive_fir_ccc Class Reference

Adaptive FIR filter with gr_complex input, gr_complex output and gr_complex taps. More...

#include <adaptive_fir_ccc.h>

Inheritance diagram for gr::filter::adaptive_fir_ccc:

List of all members.

Public Types
typedef boost::shared_ptr < adaptive_fir_ccc >	sptr
Public Member Functions
virtual void	set_taps (const std::vector< gr_complex > &taps)=0
virtual std::vector< gr_complex >	taps () const =0
Static Public Member Functions
static sptr	make (const char *name, int decimation, const std::vector< gr_complex > &taps)
	Adaptive FIR filter with gr_complex input, gr_complex output and gr_complex taps.

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Detailed Description

Adaptive FIR filter with gr_complex input, gr_complex output and gr_complex taps.

This is a base class to implement an adaptive FIR filter. Generally, another block will inherit from this one to build a new type of adaptive filter such as an equalizer.

This class implements two functions that are designed to be overloaded by the child class: error(gr_complex out) and update_tap(gr_complex tap, gr_complex in).

The error() function calculates the error value that will be used to adjust the taps. The update_tap function then uses the error and the input signal value to update a particular tap. Typically, the error is calculated for a given output and then this is used in a loop to update all of the filter taps in a loop:

     d_error = error(sum);
     for(k = 0; k < l; k++) {
       update_tap(d_taps[ntaps-k-1], in[i+k]);
     }

See digital::cma_equalizer_cc and digital::lms_dd_equalizer_cc for example usage.

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Member Typedef Documentation

typedef boost::shared_ptr<adaptive_fir_ccc> gr::filter::adaptive_fir_ccc::sptr

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Member Function Documentation

static sptr gr::filter::adaptive_fir_ccc::make	(	const char *	name,
		int	decimation,
		const std::vector< gr_complex > &	taps
	)		[static]

Adaptive FIR filter with gr_complex input, gr_complex output and gr_complex taps.

Parameters:

name	Provides a name to identify this type of algorithm
decimation	(interger) decimation rate of the filter
taps	(complex) filter taps

virtual void gr::filter::adaptive_fir_ccc::set_taps

(

const std::vector< gr_complex > &

taps

)

[pure virtual]

virtual std::vector<gr_complex> gr::filter::adaptive_fir_ccc::taps

(

)

const [pure virtual]

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

• adaptive_fir_ccc.h