digital_constellation_receiver_cb Class Reference

This block does fine-phase and frequency locking and decision making. More...

#include <digital_constellation_receiver_cb.h>

Inheritance diagram for digital_constellation_receiver_cb:

List of all members.

Public Member Functions
int	general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
	compute output items from input items
Protected Member Functions
	digital_constellation_receiver_cb (digital_constellation_sptr constellation, float loop_bw, float fmin, float fmax)
	Constructor to synchronize incoming M-PSK symbols.
void	phase_error_tracking (float phase_error)
Friends
DIGITAL_API digital_constellation_receiver_cb_sptr	digital_make_constellation_receiver_cb (digital_constellation_sptr constell, float loop_bw, float fmin, float fmax)

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Detailed Description

This block does fine-phase and frequency locking and decision making.

The phase and frequency synchronization are based on a Costas loop that finds the error of the incoming signal point compared to its nearest constellation point. The frequency and phase of the NCO are updated according to this error.

The decicision making itself is performed by the appropriate method of the passed constellation object.

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Constructor & Destructor Documentation

digital_constellation_receiver_cb::digital_constellation_receiver_cb	(	digital_constellation_sptr	constellation,
		float	loop_bw,
		float	fmin,
		float	fmax
	)		[protected]

Constructor to synchronize incoming M-PSK symbols.

Parameters:

constellation	constellation object for generic demodulation
loop_bw	Loop bandwidth of the Costas Loop (~ 2pi/100)
fmin	minimum normalized frequency value the loop can achieve
fmax	maximum normalized frequency value the loop can achieve

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Member Function Documentation

int digital_constellation_receiver_cb::general_work	(	int	noutput_items,
		gr_vector_int &	ninput_items,
		gr_vector_const_void_star &	input_items,
		gr_vector_void_star &	output_items
	)		[virtual]

compute output items from input items

Parameters:

noutput_items	number of output items to write on each output stream
ninput_items	number of input items available on each input stream
input_items	vector of pointers to the input items, one entry per input stream
output_items	vector of pointers to the output items, one entry per output stream

Returns:

number of items actually written to each output stream, or -1 on EOF. It is OK to return a value less than noutput_items. -1 <= return value <= noutput_items

general_work must call consume or consume_each to indicate how many items were consumed on each input stream.

Reimplemented from gr_block.

void digital_constellation_receiver_cb::phase_error_tracking

(

float

phase_error

)

[protected]

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Friends And Related Function Documentation

DIGITAL_API digital_constellation_receiver_cb_sptr digital_make_constellation_receiver_cb	(	digital_constellation_sptr	constell,
		float	loop_bw,
		float	fmin,
		float	fmax
	)		[friend]

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

• digital_constellation_receiver_cb.h