diff options
| author | Johnathan Corgan <johnathan@corganlabs.com> | 2013-03-15 09:57:31 -0700 |
|---|---|---|
| committer | Johnathan Corgan <johnathan@corganlabs.com> | 2013-03-15 09:57:31 -0700 |
| commit | e965a5bb209ad46a509ccd21f393667fd69d95f9 (patch) | |
| tree | 40d683ef8f80980f12eac6cfe7f3423c49b45f87 /gr-analog/include | |
| parent | 2bf9c4cb4b0b426690f353fc1662a13e70c0d5e0 (diff) | |
| parent | 27990ca9e236931e39a830e48f0a1efe13ec085f (diff) | |
Merge branch 'ofdm-master' into ofdm-next
Added fixups for next branch changes
Conflicts:
CMakeLists.txt
gnuradio-core/src/lib/io/gr_message_sink.cc
gnuradio-core/src/lib/io/gr_message_sink.h
gnuradio-core/src/lib/io/gr_message_sink.i
gnuradio-core/src/lib/io/gr_message_source.cc
gnuradio-core/src/lib/io/gr_message_source.h
gnuradio-core/src/lib/io/gr_message_source.i
gr-blocks/CMakeLists.txt
gr-digital/CMakeLists.txt
gr-digital/grc/digital_block_tree.xml
gr-digital/include/digital/CMakeLists.txt
gr-digital/include/digital_ofdm_cyclic_prefixer.h
gr-digital/lib/CMakeLists.txt
gr-digital/lib/digital_ofdm_cyclic_prefixer.cc
gr-digital/lib/ofdm_cyclic_prefixer_impl.h
gr-digital/python/CMakeLists.txt
gr-digital/swig/CMakeLists.txt
gr-digital/swig/digital_swig.i
Diffstat (limited to 'gr-analog/include')
| -rw-r--r-- | gr-analog/include/analog/CMakeLists.txt | 3 | ||||
| -rw-r--r-- | gr-analog/include/analog/plateau_detector_fb.h | 71 |
2 files changed, 73 insertions, 1 deletions
diff --git a/gr-analog/include/analog/CMakeLists.txt b/gr-analog/include/analog/CMakeLists.txt index 3c18c949ab..1cbbf988f3 100644 --- a/gr-analog/include/analog/CMakeLists.txt +++ b/gr-analog/include/analog/CMakeLists.txt @@ -95,6 +95,7 @@ install(FILES fmdet_cf.h frequency_modulator_fc.h phase_modulator_fc.h + plateau_detector_fb.h pll_carriertracking_cc.h pll_freqdet_cf.h pll_refout_cc.h @@ -106,7 +107,7 @@ install(FILES quadrature_demod_cf.h rail_ff.h sig_source_waveform.h - simple_squelch_cc.h + simple_squelch_cc.h DESTINATION ${GR_INCLUDE_DIR}/gnuradio/analog COMPONENT "analog_devel" ) diff --git a/gr-analog/include/analog/plateau_detector_fb.h b/gr-analog/include/analog/plateau_detector_fb.h new file mode 100644 index 0000000000..33629bd18b --- /dev/null +++ b/gr-analog/include/analog/plateau_detector_fb.h @@ -0,0 +1,71 @@ +/* -*- c++ -*- */ +/* + * Copyright 2012 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + + +#ifndef INCLUDED_ANALOG_PLATEAU_DETECTOR_FB_H +#define INCLUDED_ANALOG_PLATEAU_DETECTOR_FB_H + +#include <analog/api.h> +#include <gr_sync_block.h> + +namespace gr { + namespace analog { + + /*! + * \brief 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. + * + * \ingroup analog + * + */ + class ANALOG_API plateau_detector_fb : virtual public gr_sync_block + { + public: + typedef boost::shared_ptr<plateau_detector_fb> sptr; + + /*! + * \param max_len Maximum length of the plateau + * \param threshold Anything above this value is considered a plateau + */ + static sptr make(int max_len, float threshold=0.9); + }; + + } // namespace analog +} // namespace gr + +#endif /* INCLUDED_ANALOG_PLATEAU_DETECTOR_FB_H */ + |