gr::blocks::plateau_detector_fb Class Reference

Detects a plateau and marks the middle. More...

#include <plateau_detector_fb.h>

Inheritance diagram for gr::blocks::plateau_detector_fb:

List of all members.

Public Types
typedef boost::shared_ptr < plateau_detector_fb >	sptr
Static Public Member Functions
static sptr	make (int max_len, float threshold=0.9)

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Detailed Description

Detects a plateau and marks the middle.

Detect a plateau of a-priori known height. Input is a stream of floats, the output is a stream of bytes. Whenever a plateau is detected, the middle of that plateau is marked with a '1' on the output stream (all other samples are left at zero).

You can use this in a Schmidl & Cox synchronisation algorithm to interpret the output of the normalized correlator. Just pass the length of the cyclic prefix (in samples) as the max_len parameter).

Unlike the peak detectors, you must the now the absolute height of the plateau. Whenever the amplitude exceeds the given threshold, it starts assuming the presence of a plateau.

An implicit hysteresis is provided by the fact that after detecting one plateau, it waits at least max_len samples before the next plateau can be detected.

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Member Typedef Documentation

typedef boost::shared_ptr<plateau_detector_fb> gr::blocks::plateau_detector_fb::sptr

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Member Function Documentation

static sptr gr::blocks::plateau_detector_fb::make	(	int	max_len,
		float	threshold = 0.9
	)		[static]

Parameters:

max_len	Maximum length of the plateau
threshold	Anything above this value is considered a plateau

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

• gr-blocks/include/blocks/plateau_detector_fb.h