dburgess | b3a0ca4 | 2011-10-12 07:44:40 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2008 Free Software Foundation, Inc. |
| 3 | * |
| 4 | * This software is distributed under the terms of the GNU Public License. |
| 5 | * See the COPYING file in the main directory for details. |
| 6 | * |
| 7 | * This use of this software may be subject to additional restrictions. |
| 8 | * See the LEGAL file in the main directory for details. |
| 9 | |
| 10 | This program is free software: you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation, either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | |
| 23 | */ |
| 24 | |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | Compilation switches |
| 29 | TRANSMIT_LOGGING write every burst on the given slot to a log |
| 30 | */ |
| 31 | |
| 32 | #include "radioInterface.h" |
| 33 | #include "Interthread.h" |
| 34 | #include "GSMCommon.h" |
| 35 | #include "Sockets.h" |
| 36 | |
| 37 | #include <sys/types.h> |
| 38 | #include <sys/socket.h> |
| 39 | |
| 40 | /** Define this to be the slot number to be logged. */ |
| 41 | //#define TRANSMIT_LOGGING 1 |
| 42 | |
| 43 | /** The Transceiver class, responsible for physical layer of basestation */ |
| 44 | class Transceiver { |
| 45 | |
| 46 | private: |
| 47 | |
| 48 | GSM::Time mTransmitLatency; ///< latency between basestation clock and transmit deadline clock |
| 49 | GSM::Time mLatencyUpdateTime; ///< last time latency was updated |
| 50 | |
| 51 | UDPSocket mDataSocket; ///< socket for writing to/reading from GSM core |
| 52 | UDPSocket mControlSocket; ///< socket for writing/reading control commands from GSM core |
| 53 | UDPSocket mClockSocket; ///< socket for writing clock updates to GSM core |
| 54 | |
| 55 | VectorQueue mTransmitPriorityQueue; ///< priority queue of transmit bursts received from GSM core |
| 56 | VectorFIFO* mTransmitFIFO; ///< radioInterface FIFO of transmit bursts |
| 57 | VectorFIFO* mReceiveFIFO; ///< radioInterface FIFO of receive bursts |
| 58 | |
| 59 | Thread *mFIFOServiceLoopThread; ///< thread to push/pull bursts into transmit/receive FIFO |
| 60 | Thread *mControlServiceLoopThread; ///< thread to process control messages from GSM core |
| 61 | Thread *mTransmitPriorityQueueServiceLoopThread;///< thread to process transmit bursts from GSM core |
| 62 | |
| 63 | GSM::Time mTransmitDeadlineClock; ///< deadline for pushing bursts into transmit FIFO |
| 64 | GSM::Time mLastClockUpdateTime; ///< last time clock update was sent up to core |
| 65 | |
| 66 | RadioInterface *mRadioInterface; ///< associated radioInterface object |
| 67 | double txFullScale; ///< full scale input to radio |
| 68 | double rxFullScale; ///< full scale output to radio |
| 69 | |
| 70 | /** Codes for burst types of received bursts*/ |
| 71 | typedef enum { |
| 72 | OFF, ///< timeslot is off |
| 73 | TSC, ///< timeslot should contain a normal burst |
| 74 | RACH, ///< timeslot should contain an access burst |
| 75 | IDLE ///< timeslot is an idle (or dummy) burst |
| 76 | } CorrType; |
| 77 | |
| 78 | |
| 79 | /** Codes for channel combinations */ |
| 80 | typedef enum { |
| 81 | FILL, ///< Channel is transmitted, but unused |
| 82 | I, ///< TCH/FS |
| 83 | II, ///< TCH/HS, idle every other slot |
| 84 | III, ///< TCH/HS |
| 85 | IV, ///< FCCH+SCH+CCCH+BCCH, uplink RACH |
| 86 | V, ///< FCCH+SCH+CCCH+BCCH+SDCCH/4+SACCH/4, uplink RACH+SDCCH/4 |
| 87 | VI, ///< CCCH+BCCH, uplink RACH |
| 88 | VII, ///< SDCCH/8 + SACCH/8 |
| 89 | NONE, ///< Channel is inactive, default |
| 90 | LOOPBACK ///< similar go VII, used in loopback testing |
| 91 | } ChannelCombination; |
| 92 | |
| 93 | |
| 94 | /** unmodulate a modulated burst */ |
| 95 | #ifdef TRANSMIT_LOGGING |
| 96 | void unModulateVector(signalVector wVector); |
| 97 | #endif |
| 98 | |
| 99 | /** modulate and add a burst to the transmit queue */ |
| 100 | void addRadioVector(BitVector &burst, |
| 101 | int RSSI, |
| 102 | GSM::Time &wTime); |
| 103 | |
| 104 | /** Push modulated burst into transmit FIFO corresponding to a particular timestamp */ |
| 105 | void pushRadioVector(GSM::Time &nowTime); |
| 106 | |
| 107 | /** Pull and demodulate a burst from the receive FIFO */ |
| 108 | SoftVector *pullRadioVector(GSM::Time &wTime, |
| 109 | int &RSSI, |
| 110 | int &timingOffset); |
| 111 | |
| 112 | /** Set modulus for specific timeslot */ |
| 113 | void setModulus(int timeslot); |
| 114 | |
| 115 | /** return the expected burst type for the specified timestamp */ |
| 116 | CorrType expectedCorrType(GSM::Time currTime); |
| 117 | |
| 118 | /** send messages over the clock socket */ |
| 119 | void writeClockInterface(void); |
| 120 | |
| 121 | signalVector *gsmPulse; ///< the GSM shaping pulse for modulation |
| 122 | |
| 123 | int mSamplesPerSymbol; ///< number of samples per GSM symbol |
| 124 | |
| 125 | bool mOn; ///< flag to indicate that transceiver is powered on |
| 126 | ChannelCombination mChanType[8]; ///< channel types for all timeslots |
| 127 | double mTxFreq; ///< the transmit frequency |
| 128 | double mRxFreq; ///< the receive frequency |
| 129 | int mPower; ///< the transmit power in dB |
| 130 | unsigned mTSC; ///< the midamble sequence code |
| 131 | double mEnergyThreshold; ///< threshold to determine if received data is potentially a GSM burst |
| 132 | GSM::Time prevFalseDetectionTime; ///< last timestamp of a false energy detection |
| 133 | int fillerModulus[8]; ///< modulus values of all timeslots, in frames |
| 134 | signalVector *fillerTable[102][8]; ///< table of modulated filler waveforms for all timeslots |
| 135 | unsigned mMaxExpectedDelay; ///< maximum expected time-of-arrival offset in GSM symbols |
| 136 | |
| 137 | GSM::Time channelEstimateTime[8]; ///< last timestamp of each timeslot's channel estimate |
| 138 | signalVector *channelResponse[8]; ///< most recent channel estimate of all timeslots |
| 139 | float SNRestimate[8]; ///< most recent SNR estimate of all timeslots |
| 140 | signalVector *DFEForward[8]; ///< most recent DFE feedforward filter of all timeslots |
| 141 | signalVector *DFEFeedback[8]; ///< most recent DFE feedback filter of all timeslots |
| 142 | float chanRespOffset[8]; ///< most recent timing offset, e.g. TOA, of all timeslots |
| 143 | complex chanRespAmplitude[8]; ///< most recent channel amplitude of all timeslots |
| 144 | |
| 145 | public: |
| 146 | |
| 147 | /** Transceiver constructor |
| 148 | @param wBasePort base port number of UDP sockets |
| 149 | @param TRXAddress IP address of the TRX manager, as a string |
| 150 | @param wSamplesPerSymbol number of samples per GSM symbol |
| 151 | @param wTransmitLatency initial setting of transmit latency |
| 152 | @param radioInterface associated radioInterface object |
| 153 | */ |
| 154 | Transceiver(int wBasePort, |
| 155 | const char *TRXAddress, |
| 156 | int wSamplesPerSymbol, |
| 157 | GSM::Time wTransmitLatency, |
| 158 | RadioInterface *wRadioInterface); |
| 159 | |
| 160 | /** Destructor */ |
| 161 | ~Transceiver(); |
| 162 | |
| 163 | /** start the Transceiver */ |
| 164 | void start(); |
| 165 | |
| 166 | /** attach the radioInterface receive FIFO */ |
| 167 | void receiveFIFO(VectorFIFO *wFIFO) { mReceiveFIFO = wFIFO;} |
| 168 | |
| 169 | /** attach the radioInterface transmit FIFO */ |
| 170 | void transmitFIFO(VectorFIFO *wFIFO) { mTransmitFIFO = wFIFO;} |
| 171 | |
| 172 | |
| 173 | protected: |
| 174 | |
| 175 | /** drive reception and demodulation of GSM bursts */ |
| 176 | void driveReceiveFIFO(); |
| 177 | |
| 178 | /** drive transmission of GSM bursts */ |
| 179 | void driveTransmitFIFO(); |
| 180 | |
| 181 | /** drive handling of control messages from GSM core */ |
| 182 | void driveControl(); |
| 183 | |
| 184 | /** |
| 185 | drive modulation and sorting of GSM bursts from GSM core |
| 186 | @return true if a burst was transferred successfully |
| 187 | */ |
| 188 | bool driveTransmitPriorityQueue(); |
| 189 | |
| 190 | friend void *FIFOServiceLoopAdapter(Transceiver *); |
| 191 | |
| 192 | friend void *ControlServiceLoopAdapter(Transceiver *); |
| 193 | |
| 194 | friend void *TransmitPriorityQueueServiceLoopAdapter(Transceiver *); |
| 195 | |
| 196 | void reset(); |
| 197 | }; |
| 198 | |
| 199 | /** FIFO thread loop */ |
| 200 | void *FIFOServiceLoopAdapter(Transceiver *); |
| 201 | |
| 202 | /** control message handler thread loop */ |
| 203 | void *ControlServiceLoopAdapter(Transceiver *); |
| 204 | |
| 205 | /** transmit queueing thread loop */ |
| 206 | void *TransmitPriorityQueueServiceLoopAdapter(Transceiver *); |
| 207 | |