itpp::Pulse_Shape< T1, T2, T3 > Class Template Reference

General FIR Pulse Shape. More...

#include <itpp/comm/pulse_shape.h>

Public Member Functions
	Pulse_Shape ()
	Constructor.
	Pulse_Shape (const Vec< T2 > &impulse_response, int upsampling_factor)
	Constructor.
virtual	~Pulse_Shape ()
	Destructor.
void	set_pulse_shape (const Vec< T2 > &impulse_response, int upsampling_factor)
	Set the general impulse response of the FIR filter.
Vec< T2 >	get_pulse_shape (void) const
	Get the pulse shape.
int	get_upsampling_factor () const
	Get the over sampling factor.
int	get_pulse_length () const
	Get the length of the pulse in number of symbols.
int	get_filter_length () const
	Get the length of the internal FIR filter.
void	shape_symbols (const Vec< T1 > &input, Vec< T3 > &output)
	Shape the input symbols performing upsampling.
Vec< T3 >	shape_symbols (const Vec< T1 > &input)
	Shape the input symbols performing upsampling.
void	shape_samples (const Vec< T1 > &input, Vec< T3 > &output)
	Shape the input samples already upsampled.
Vec< T3 >	shape_samples (const Vec< T1 > &input)
	Shape the input symbols already upsampled.
void	clear (void)
	Clear internal states.

Protected Attributes
Vec< T2 >	impulse_response
	The impulse resounse of the pulse shaping filter.
MA_Filter< T1, T2, T3 >	shaping_filter
	The pulse shaping filter.
int	pulse_length
	Length in symbols.
int	upsampling_factor
	Samples per input symbol.
bool	setup_done
	Ensures that setup is called before any other member function.

Detailed Description

template<class T1, class T2, class T3>
class itpp::Pulse_Shape< T1, T2, T3 >

General FIR Pulse Shape.

Upsamples and shapes symbols according to a given FIR filter. Observe that since the shaping is done with a FIR filter, the first samples in the output are zero or small before the memory of the filter is filled.

The class is templated as follows:

• T1 is the type of the input samples
• T2 is the type of the filter coefficients
• T3 is the type of the output samples

An example of usage is:

#include "itpp/itcomm.h"

vec filter_response;
filter_response ="0.7 0.3 0.6";
Pulse_Shape<double,double,double> shaper(filter_response, 4);
BPSK bpsk;
vec symbols, samples;

symbols = bpsk.modulate_bits(randb(20));
samples = shaper.shape_symbols(symbols);

Definition at line 73 of file pulse_shape.h.

Member Function Documentation

template<class T1 , class T2, class T3 >

void itpp::Pulse_Shape< T1, T2, T3 >::set_pulse_shape	(	const Vec< T2 > &	impulse_response,
		int	upsampling_factor
	)

Set the general impulse response of the FIR filter.

Observe that the pulse shape must have a duration of an integer number of symbols. Thus the length of the impulse response-1 modulo over sampling is an integer.

Definition at line 267 of file pulse_shape.h.

References itpp::Vec< Num_T >::clear(), it_error_if, and itpp::Vec< Num_T >::size().

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

• itpp/comm/pulse_shape.h