| 1 | /**************************************************************************** |
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| 2 | |
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| 3 | Copyright 2007 Virginia Polytechnic Institute and State University |
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| 4 | |
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| 5 | This file is part of the OSSIE Demodulator. |
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| 6 | |
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| 7 | OSSIE Demodulator is free software; you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation; either version 2 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |
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| 12 | OSSIE Demodulator is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with OSSIE Demodulator; if not, write to the Free Software |
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| 19 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 20 | |
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| 21 | ****************************************************************************/ |
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| 22 | |
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| 23 | |
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| 24 | #ifndef __DEMODULATORDSP_IMPL_H__ |
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| 25 | #define __DEMODULATORDSP_IMPL_H__ |
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| 26 | |
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| 27 | #include <stdlib.h> |
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| 28 | #include "sigproc/SigProc.h" |
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| 29 | |
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| 30 | #define BIT0 0 |
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| 31 | #define BIT1 1 |
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| 32 | |
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| 33 | #define TARGET_SIGNAL_ENERGY 10000 |
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| 34 | |
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| 35 | /// Modulation scheme |
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| 36 | enum ModulationScheme { |
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| 37 | MOD_BPSK, |
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| 38 | MOD_QPSK, |
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| 39 | MOD_8PSK, |
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| 40 | MOD_16QAM, |
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| 41 | MOD_4PAM, |
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| 42 | MOD_DBPSK, |
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| 43 | MOD_DQPSK, |
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| 44 | MOD_D8PSK |
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| 45 | }; |
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| 46 | |
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| 47 | /** \brief |
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| 48 | * |
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| 49 | * |
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| 50 | */ |
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| 51 | class DemodulatorDSP |
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| 52 | { |
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| 53 | public: |
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| 54 | /// Initializing constructor |
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| 55 | DemodulatorDSP(); |
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| 56 | |
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| 57 | /// Destructor |
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| 58 | ~DemodulatorDSP(); |
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| 59 | |
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| 60 | /// Set modulation scheme |
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| 61 | void SetModulationScheme(ModulationScheme _ms); |
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| 62 | |
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| 63 | /// Demodulates sequence of symbols |
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| 64 | void DemodulateSequence( |
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| 65 | short * I_in, |
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| 66 | short * Q_in, |
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| 67 | unsigned int N_in, |
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| 68 | char * bits_out); |
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| 69 | |
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| 70 | protected: |
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| 71 | /// Demodulation function pointer |
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| 72 | void (*Demodulate) ( |
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| 73 | short & I_in, |
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| 74 | short & Q_in, |
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| 75 | char * bits_out); |
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| 76 | |
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| 77 | /// |
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| 78 | ///\todo check amplitude correction method |
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| 79 | void ScaleSignalAmplitude( |
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| 80 | short * I_in, |
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| 81 | short * Q_in, |
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| 82 | unsigned int N_in, |
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| 83 | unsigned int targetEnergy); |
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| 84 | |
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| 85 | unsigned int bitsPerSymbol; ///< Number of bits represented by each symbol |
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| 86 | short state_i; ///< In-phase state for differential mode |
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| 87 | short state_q; ///< Quadrature state for differential mode |
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| 88 | ModulationScheme mod_scheme; ///< Current (de)modulation scheme |
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| 89 | bool differentialMode; ///< Differential PSK mode flag |
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| 90 | |
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| 91 | private: |
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| 92 | /// Disallow copy constructor |
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| 93 | DemodulatorDSP(DemodulatorDSP&); |
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| 94 | |
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| 95 | }; |
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| 96 | |
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| 97 | #endif |
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| 98 | |
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| 99 | /// |
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| 100 | void DemodulateBPSK( |
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| 101 | short & I_in, |
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| 102 | short & Q_in, |
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| 103 | char * bits_out); |
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| 104 | |
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| 105 | /// |
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| 106 | void DemodulateQPSK( |
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| 107 | short & I_in, |
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| 108 | short & Q_in, |
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| 109 | char * bits_out); |
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| 110 | |
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| 111 | /// |
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| 112 | void Demodulate8PSK( |
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| 113 | short & I_in, |
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| 114 | short & Q_in, |
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| 115 | char * bits_out); |
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| 116 | |
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| 117 | /// |
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| 118 | void Demodulate16QAM( |
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| 119 | short & I_in, |
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| 120 | short & Q_in, |
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| 121 | char * bits_out); |
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| 122 | |
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| 123 | /// |
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| 124 | void Demodulate4PAM( |
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| 125 | short & I_in, |
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| 126 | short & Q_in, |
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| 127 | char * bits_out); |
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| 128 | |
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