Plateau Detector: Difference between revisions
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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. | |||
== Parameters == | == Parameters == | ||
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span> | (''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span> | ||
; | ; Max plateau length | ||
: | : Maximum length of the plateau | ||
; | ; Threshold (''R'') | ||
: | : Anything above this value is considered a plateau | ||
== Example Flowgraph == | == Example Flowgraph == | ||
Latest revision as of 16:12, 4 September 2019
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.
Parameters
(R): Run-time adjustable
- Max plateau length
- Maximum length of the plateau
- Threshold (R)
- Anything above this value is considered a plateau
Example Flowgraph
Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
Source Files
- C++ files
- TODO
- Header files
- TODO
- Public header files
- TODO
- Block definition
- TODO