2010-05-24 02:42:16 +00:00
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/*
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* Copyright 2008, 2009, 2010 Free Software Foundation, Inc.
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*
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2010-07-17 00:09:09 +00:00
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* This software is distributed under the terms of the GNU Affero Public License.
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2010-05-24 02:42:16 +00:00
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* See the COPYING file in the main directory for details.
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*
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* This use of this software may be subject to additional restrictions.
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* See the LEGAL file in the main directory for details.
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This program is free software: you can redistribute it and/or modify
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2010-07-04 22:28:06 +00:00
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it under the terms of the GNU Affero General Public License as published by
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2010-05-24 02:42:16 +00:00
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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2010-07-04 22:28:06 +00:00
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GNU Affero General Public License for more details.
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2010-05-24 02:42:16 +00:00
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2010-07-04 22:28:06 +00:00
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You should have received a copy of the GNU Affero General Public License
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2010-05-24 02:42:16 +00:00
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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Compilation switches
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TRANSMIT_LOGGING write every burst on the given slot to a log
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*/
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#include <stdio.h>
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#include "Transceiver.h"
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#include <Logger.h>
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Transceiver::Transceiver(int wBasePort,
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const char *TRXAddress,
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int wSamplesPerSymbol,
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GSM::Time wTransmitLatency,
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RadioInterface *wRadioInterface)
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:mDataSocket(wBasePort+2,TRXAddress,wBasePort+102),
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mControlSocket(wBasePort+1,TRXAddress,wBasePort+101),
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mClockSocket(wBasePort,TRXAddress,wBasePort+100)
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{
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//GSM::Time startTime(0,0);
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//GSM::Time startTime(gHyperframe/2 - 4*216*60,0);
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GSM::Time startTime(random() % gHyperframe,0);
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mFIFOServiceLoopThread = new Thread(32768); ///< thread to push bursts into transmit FIFO
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mControlServiceLoopThread = new Thread(32768); ///< thread to process control messages from GSM core
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mTransmitPriorityQueueServiceLoopThread = new Thread(32768);///< thread to process transmit bursts from GSM core
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mSamplesPerSymbol = wSamplesPerSymbol;
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mRadioInterface = wRadioInterface;
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mTransmitLatency = wTransmitLatency;
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mTransmitDeadlineClock = startTime;
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mLastClockUpdateTime = startTime;
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mLatencyUpdateTime = startTime;
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mRadioInterface->getClock()->set(startTime);
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mMaxExpectedDelay = 0;
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// generate pulse and setup up signal processing library
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gsmPulse = generateGSMPulse(2,mSamplesPerSymbol);
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LOG(DEBUG) << "gsmPulse: " << *gsmPulse;
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sigProcLibSetup(mSamplesPerSymbol);
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txFullScale = mRadioInterface->fullScaleInputValue();
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rxFullScale = mRadioInterface->fullScaleOutputValue();
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// initialize filler tables with dummy bursts, initialize other per-timeslot variables
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for (int i = 0; i < 8; i++) {
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signalVector* modBurst = modulateBurst(gDummyBurst,*gsmPulse,
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8 + (i % 4 == 0),
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mSamplesPerSymbol);
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scaleVector(*modBurst,txFullScale);
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fillerModulus[i]=26;
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for (int j = 0; j < 102; j++) {
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fillerTable[j][i] = new signalVector(*modBurst);
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}
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delete modBurst;
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mChanType[i] = NONE;
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channelResponse[i] = NULL;
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DFEForward[i] = NULL;
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DFEFeedback[i] = NULL;
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channelEstimateTime[i] = startTime;
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}
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mOn = false;
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mTxFreq = 0.0;
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mRxFreq = 0.0;
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mPower = -10;
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mEnergyThreshold = 5.0; // based on empirical data
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prevFalseDetectionTime = startTime;
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}
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Transceiver::~Transceiver()
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{
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delete gsmPulse;
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sigProcLibDestroy();
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mTransmitPriorityQueue.clear();
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}
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void Transceiver::addRadioVector(BitVector &burst,
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int RSSI,
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GSM::Time &wTime)
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{
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// modulate and stick into queue
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signalVector* modBurst = modulateBurst(burst,*gsmPulse,
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8 + (wTime.TN() % 4 == 0),
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mSamplesPerSymbol);
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scaleVector(*modBurst,txFullScale * pow(10,-RSSI/10));
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radioVector *newVec = new radioVector(*modBurst,wTime);
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mTransmitPriorityQueue.write(newVec);
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delete modBurst;
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}
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#ifdef TRANSMIT_LOGGING
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void Transceiver::unModulateVector(signalVector wVector)
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{
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SoftVector *burst = demodulateBurst(wVector,
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*gsmPulse,
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mSamplesPerSymbol,
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1.0,0.0);
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LOG(DEEPDEBUG) << "LOGGED BURST: " << *burst;
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/*
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unsigned char burstStr[gSlotLen+1];
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SoftVector::iterator burstItr = burst->begin();
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for (int i = 0; i < gSlotLen; i++) {
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// FIXME: Demod bits are inverted!
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burstStr[i] = (unsigned char) ((*burstItr++)*255.0);
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}
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burstStr[gSlotLen]='\0';
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LOG(DEEPDEBUG) << "LOGGED BURST: " << burstStr;
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*/
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delete burst;
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}
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#endif
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void Transceiver::pushRadioVector(GSM::Time &nowTime)
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{
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// dump stale bursts, if any
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while (radioVector* staleBurst = mTransmitPriorityQueue.getStaleBurst(nowTime)) {
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// Even if the burst is stale, put it in the fillter table.
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// (It might be an idle pattern.)
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LOG(NOTICE) << "dumping STALE burst in TRX->USRP interface";
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const GSM::Time& nextTime = staleBurst->time();
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int TN = nextTime.TN();
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int modFN = nextTime.FN() % fillerModulus[TN];
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delete fillerTable[modFN][TN];
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fillerTable[modFN][TN] = staleBurst;
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}
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int TN = nowTime.TN();
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int modFN = nowTime.FN() % fillerModulus[nowTime.TN()];
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// if queue contains data at the desired timestamp, stick it into FIFO
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if (radioVector *next = (radioVector*) mTransmitPriorityQueue.getCurrentBurst(nowTime)) {
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LOG(DEBUG) << "transmitFIFO: wrote burst " << next << " at time: " << nowTime;
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delete fillerTable[modFN][TN];
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fillerTable[modFN][TN] = new signalVector(*(next));
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mRadioInterface->driveTransmitRadio(*(next),(mChanType[TN]==NONE)); //fillerTable[modFN][TN]));
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delete next;
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#ifdef TRANSMIT_LOGGING
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if (nowTime.TN()==TRANSMIT_LOGGING) {
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unModulateVector(*(fillerTable[modFN][TN]));
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}
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#endif
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return;
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}
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// otherwise, pull filler data, and push to radio FIFO
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mRadioInterface->driveTransmitRadio(*(fillerTable[modFN][TN]),(mChanType[TN]==NONE));
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#ifdef TRANSMIT_LOGGING
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if (nowTime.TN()==TRANSMIT_LOGGING)
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unModulateVector(*fillerTable[modFN][TN]);
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#endif
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}
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void Transceiver::setModulus(int timeslot)
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{
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switch (mChanType[timeslot]) {
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case NONE:
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case I:
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case II:
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case III:
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case FILL:
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fillerModulus[timeslot] = 26;
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break;
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case IV:
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case VI:
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case V:
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fillerModulus[timeslot] = 51;
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break;
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//case V:
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case VII:
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fillerModulus[timeslot] = 102;
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break;
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default:
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break;
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}
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}
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Transceiver::CorrType Transceiver::expectedCorrType(GSM::Time currTime)
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{
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unsigned burstTN = currTime.TN();
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unsigned burstFN = currTime.FN();
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switch (mChanType[burstTN]) {
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case NONE:
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return OFF;
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break;
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case FILL:
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return IDLE;
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break;
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case I:
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return TSC;
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/*if (burstFN % 26 == 25)
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return IDLE;
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else
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return TSC;*/
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break;
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case II:
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if (burstFN % 2 == 1)
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return IDLE;
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else
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return TSC;
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break;
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case III:
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return TSC;
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break;
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case IV:
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case VI:
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return RACH;
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break;
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case V: {
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int mod51 = burstFN % 51;
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if ((mod51 <= 36) && (mod51 >= 14))
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return RACH;
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else if ((mod51 == 4) || (mod51 == 5))
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return RACH;
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else if ((mod51 == 45) || (mod51 == 46))
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return RACH;
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else
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return TSC;
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break;
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}
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case VII:
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if ((burstFN % 51 <= 14) && (burstFN % 51 >= 12))
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return IDLE;
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else
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return TSC;
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break;
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case LOOPBACK:
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if ((burstFN % 51 <= 50) && (burstFN % 51 >=48))
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return IDLE;
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else
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return TSC;
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break;
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default:
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return OFF;
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break;
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}
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}
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SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
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int &RSSI,
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int &timingOffset)
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{
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bool needDFE = (mMaxExpectedDelay > 1);
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radioVector *rxBurst = (radioVector *) mReceiveFIFO->get();
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if (!rxBurst) return NULL;
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LOG(DEBUG) << "receiveFIFO: read radio vector at time: " << rxBurst->time() << ", new size: " << mReceiveFIFO->size();
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int timeslot = rxBurst->time().TN();
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CorrType corrType = expectedCorrType(rxBurst->time());
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if ((corrType==OFF) || (corrType==IDLE)) {
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delete rxBurst;
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return NULL;
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}
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// check to see if received burst has sufficient
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signalVector *vectorBurst = rxBurst;
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complex amplitude = 0.0;
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float TOA = 0.0;
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float avgPwr = 0.0;
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if (!energyDetect(*vectorBurst,20*mSamplesPerSymbol,mEnergyThreshold,&avgPwr)) {
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LOG(DEBUG) << "Estimated Energy: " << sqrt(avgPwr) << ", at time " << rxBurst->time();
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double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
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if (framesElapsed > 50) { // if we haven't had any false detections for a while, lower threshold
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mEnergyThreshold -= 10.0/10.0;
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2011-05-26 02:56:15 +00:00
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if (mEnergyThreshold < 0.0)
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mEnergyThreshold = 0.0;
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2010-05-24 02:42:16 +00:00
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prevFalseDetectionTime = rxBurst->time();
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}
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delete rxBurst;
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return NULL;
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}
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LOG(DEBUG) << "Estimated Energy: " << sqrt(avgPwr) << ", at time " << rxBurst->time();
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// run the proper correlator
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bool success = false;
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if (corrType==TSC) {
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LOG(DEEPDEBUG) << "looking for TSC at time: " << rxBurst->time();
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signalVector *channelResp;
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double framesElapsed = rxBurst->time()-channelEstimateTime[timeslot];
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bool estimateChannel = false;
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if ((framesElapsed > 50) || (channelResponse[timeslot]==NULL)) {
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if (channelResponse[timeslot]) delete channelResponse[timeslot];
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if (DFEForward[timeslot]) delete DFEForward[timeslot];
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if (DFEFeedback[timeslot]) delete DFEFeedback[timeslot];
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channelResponse[timeslot] = NULL;
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DFEForward[timeslot] = NULL;
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DFEFeedback[timeslot] = NULL;
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estimateChannel = true;
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}
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if (!needDFE) estimateChannel = false;
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float chanOffset;
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success = analyzeTrafficBurst(*vectorBurst,
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mTSC,
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3.0,
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mSamplesPerSymbol,
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&litude,
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&TOA,
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mMaxExpectedDelay,
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estimateChannel,
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&channelResp,
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&chanOffset);
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if (success) {
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LOG(DEBUG) << "FOUND TSC!!!!!! " << amplitude << " " << TOA;
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mEnergyThreshold -= 1.0F/10.0F;
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if (mEnergyThreshold < 0.0) mEnergyThreshold = 0.0;
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SNRestimate[timeslot] = amplitude.norm2()/(mEnergyThreshold*mEnergyThreshold+1.0); // this is not highly accurate
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if (estimateChannel) {
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LOG(DEBUG) << "estimating channel...";
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channelResponse[timeslot] = channelResp;
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chanRespOffset[timeslot] = chanOffset;
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chanRespAmplitude[timeslot] = amplitude;
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scaleVector(*channelResp, complex(1.0,0.0)/amplitude);
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designDFE(*channelResp, SNRestimate[timeslot], 7, &DFEForward[timeslot], &DFEFeedback[timeslot]);
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channelEstimateTime[timeslot] = rxBurst->time();
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LOG(DEBUG) << "SNR: " << SNRestimate[timeslot] << ", DFE forward: " << *DFEForward[timeslot] << ", DFE backward: " << *DFEFeedback[timeslot];
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}
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}
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else {
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double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
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LOG(DEEPDEBUG) << "wTime: " << rxBurst->time() << ", pTime: " << prevFalseDetectionTime << ", fElapsed: " << framesElapsed;
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mEnergyThreshold += 10.0F/10.0F*exp(-framesElapsed);
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|
|
prevFalseDetectionTime = rxBurst->time();
|
|
|
|
channelResponse[timeslot] = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
// RACH burst
|
|
|
|
success = detectRACHBurst(*vectorBurst,
|
|
|
|
5.0, // detection threshold
|
|
|
|
mSamplesPerSymbol,
|
|
|
|
&litude,
|
|
|
|
&TOA);
|
|
|
|
if (success) {
|
|
|
|
LOG(DEBUG) << "FOUND RACH!!!!!! " << amplitude << " " << TOA;
|
|
|
|
mEnergyThreshold -= (1.0F/10.0F);
|
|
|
|
if (mEnergyThreshold < 0.0) mEnergyThreshold = 0.0;
|
|
|
|
channelResponse[timeslot] = NULL;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
|
|
|
|
mEnergyThreshold += (1.0F/10.0F)*exp(-framesElapsed);
|
|
|
|
prevFalseDetectionTime = rxBurst->time();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
LOG(DEBUG) << "energy Threshold = " << mEnergyThreshold;
|
|
|
|
|
|
|
|
// demodulate burst
|
|
|
|
SoftVector *burst = NULL;
|
|
|
|
if ((rxBurst) && (success)) {
|
|
|
|
if ((corrType==RACH) || (!needDFE)) {
|
|
|
|
burst = demodulateBurst(*vectorBurst,
|
|
|
|
*gsmPulse,
|
|
|
|
mSamplesPerSymbol,
|
|
|
|
amplitude,TOA);
|
|
|
|
}
|
|
|
|
else { // TSC
|
|
|
|
scaleVector(*vectorBurst,complex(1.0,0.0)/amplitude);
|
|
|
|
burst = equalizeBurst(*vectorBurst,
|
|
|
|
TOA-chanRespOffset[timeslot],
|
|
|
|
mSamplesPerSymbol,
|
|
|
|
*DFEForward[timeslot],
|
|
|
|
*DFEFeedback[timeslot]);
|
|
|
|
}
|
|
|
|
wTime = rxBurst->time();
|
|
|
|
RSSI = (int) floor(20.0*log10(rxFullScale/amplitude.abs()));
|
|
|
|
LOG(DEBUG) << "RSSI: " << RSSI;
|
|
|
|
timingOffset = (int) round(TOA*256.0/mSamplesPerSymbol);
|
|
|
|
}
|
|
|
|
|
|
|
|
//if (burst) LOG(DEEPDEBUG) << "burst: " << *burst << '\n';
|
|
|
|
|
|
|
|
delete rxBurst;
|
|
|
|
|
|
|
|
return burst;
|
|
|
|
}
|
|
|
|
|
|
|
|
void Transceiver::start()
|
|
|
|
{
|
|
|
|
mControlServiceLoopThread->start((void * (*)(void*))ControlServiceLoopAdapter,(void*) this);
|
|
|
|
}
|
|
|
|
|
|
|
|
void Transceiver::reset()
|
|
|
|
{
|
|
|
|
mTransmitPriorityQueue.clear();
|
|
|
|
//mTransmitFIFO->clear();
|
|
|
|
//mReceiveFIFO->clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void Transceiver::driveControl()
|
|
|
|
{
|
|
|
|
|
|
|
|
int MAX_PACKET_LENGTH = 100;
|
|
|
|
|
|
|
|
// check control socket
|
|
|
|
char buffer[MAX_PACKET_LENGTH];
|
|
|
|
int msgLen = -1;
|
|
|
|
buffer[0] = '\0';
|
|
|
|
|
|
|
|
msgLen = mControlSocket.read(buffer);
|
|
|
|
|
|
|
|
if (msgLen < 1) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
char cmdcheck[4];
|
|
|
|
char command[MAX_PACKET_LENGTH];
|
|
|
|
char response[MAX_PACKET_LENGTH];
|
|
|
|
|
|
|
|
sscanf(buffer,"%3s %s",cmdcheck,command);
|
|
|
|
|
|
|
|
writeClockInterface();
|
|
|
|
|
|
|
|
if (strcmp(cmdcheck,"CMD")!=0) {
|
|
|
|
LOG(WARN) << "bogus message on control interface";
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
LOG(INFO) << "command is " << buffer;
|
|
|
|
|
|
|
|
if (strcmp(command,"POWEROFF")==0) {
|
|
|
|
// turn off transmitter/demod
|
|
|
|
sprintf(response,"RSP POWEROFF 0");
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"POWERON")==0) {
|
|
|
|
// turn on transmitter/demod
|
|
|
|
if (!mTxFreq || !mRxFreq)
|
|
|
|
sprintf(response,"RSP POWERON 1");
|
|
|
|
else {
|
|
|
|
sprintf(response,"RSP POWERON 0");
|
|
|
|
if (!mOn) {
|
|
|
|
// Prepare for thread start
|
|
|
|
mPower = -20;
|
|
|
|
mRadioInterface->start();
|
|
|
|
generateRACHSequence(*gsmPulse,mSamplesPerSymbol);
|
|
|
|
|
|
|
|
// Start radio interface threads.
|
|
|
|
mFIFOServiceLoopThread->start((void * (*)(void*))FIFOServiceLoopAdapter,(void*) this);
|
|
|
|
mTransmitPriorityQueueServiceLoopThread->start((void * (*)(void*))TransmitPriorityQueueServiceLoopAdapter,(void*) this);
|
|
|
|
writeClockInterface();
|
|
|
|
|
|
|
|
mOn = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"SETMAXDLY")==0) {
|
|
|
|
//set expected maximum time-of-arrival
|
|
|
|
int maxDelay;
|
|
|
|
sscanf(buffer,"%3s %s %d",cmdcheck,command,&maxDelay);
|
|
|
|
mMaxExpectedDelay = maxDelay; // 1 GSM symbol is approx. 1 km
|
|
|
|
sprintf(response,"RSP SETMAXDLY 0 %d",maxDelay);
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"SETRXGAIN")==0) {
|
|
|
|
//set expected maximum time-of-arrival
|
|
|
|
int newGain;
|
|
|
|
sscanf(buffer,"%3s %s %d",cmdcheck,command,&newGain);
|
|
|
|
newGain = mRadioInterface->setRxGain(newGain);
|
|
|
|
sprintf(response,"RSP SETRXGAIN 0 %d",newGain);
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"NOISELEV")==0) {
|
|
|
|
if (mOn) {
|
|
|
|
sprintf(response,"RSP NOISELEV 0 %d",
|
|
|
|
(int) round(20.0*log10(rxFullScale/mEnergyThreshold)));
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
sprintf(response,"RSP NOISELEV 1 0");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"SETPOWER")==0) {
|
|
|
|
// set output power in dB
|
|
|
|
int dbPwr;
|
|
|
|
sscanf(buffer,"%3s %s %d",cmdcheck,command,&dbPwr);
|
|
|
|
if (!mOn)
|
|
|
|
sprintf(response,"RSP SETPOWER 1 %d",dbPwr);
|
|
|
|
else {
|
|
|
|
mPower = dbPwr;
|
2011-05-23 21:26:52 +00:00
|
|
|
mRadioInterface->setPowerAttenuation(dbPwr);
|
2010-05-24 02:42:16 +00:00
|
|
|
sprintf(response,"RSP SETPOWER 0 %d",dbPwr);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"ADJPOWER")==0) {
|
|
|
|
// adjust power in dB steps
|
|
|
|
int dbStep;
|
|
|
|
sscanf(buffer,"%3s %s %d",cmdcheck,command,&dbStep);
|
|
|
|
if (!mOn)
|
|
|
|
sprintf(response,"RSP ADJPOWER 1 %d",mPower);
|
|
|
|
else {
|
|
|
|
mPower += dbStep;
|
|
|
|
sprintf(response,"RSP ADJPOWER 0 %d",mPower);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#define FREQOFFSET 0//11.2e3
|
|
|
|
else if (strcmp(command,"RXTUNE")==0) {
|
|
|
|
// tune receiver
|
|
|
|
int freqKhz;
|
|
|
|
sscanf(buffer,"%3s %s %d",cmdcheck,command,&freqKhz);
|
|
|
|
mRxFreq = freqKhz*1.0e3+FREQOFFSET;
|
|
|
|
if (!mRadioInterface->tuneRx(mRxFreq)) {
|
|
|
|
LOG(ALARM) << "RX failed to tune";
|
|
|
|
sprintf(response,"RSP RXTUNE 1 %d",freqKhz);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
sprintf(response,"RSP RXTUNE 0 %d",freqKhz);
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"TXTUNE")==0) {
|
|
|
|
// tune txmtr
|
|
|
|
int freqKhz;
|
|
|
|
sscanf(buffer,"%3s %s %d",cmdcheck,command,&freqKhz);
|
|
|
|
//freqKhz = 890e3;
|
|
|
|
mTxFreq = freqKhz*1.0e3+FREQOFFSET;
|
|
|
|
if (!mRadioInterface->tuneTx(mTxFreq)) {
|
|
|
|
LOG(ALARM) << "TX failed to tune";
|
|
|
|
sprintf(response,"RSP TXTUNE 1 %d",freqKhz);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
sprintf(response,"RSP TXTUNE 0 %d",freqKhz);
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"SETTSC")==0) {
|
|
|
|
// set TSC
|
|
|
|
int TSC;
|
|
|
|
sscanf(buffer,"%3s %s %d",cmdcheck,command,&TSC);
|
|
|
|
if (mOn)
|
|
|
|
sprintf(response,"RSP SETTSC 1 %d",TSC);
|
|
|
|
else {
|
|
|
|
mTSC = TSC;
|
|
|
|
generateMidamble(*gsmPulse,mSamplesPerSymbol,TSC);
|
|
|
|
sprintf(response,"RSP SETTSC 0 %d",TSC);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (strcmp(command,"SETSLOT")==0) {
|
|
|
|
// set TSC
|
|
|
|
int corrCode;
|
|
|
|
int timeslot;
|
|
|
|
sscanf(buffer,"%3s %s %d %d",cmdcheck,command,×lot,&corrCode);
|
|
|
|
if ((timeslot < 0) || (timeslot > 7)) {
|
|
|
|
LOG(WARN) << "bogus message on control interface";
|
|
|
|
sprintf(response,"RSP SETSLOT 1 %d %d",timeslot,corrCode);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
mChanType[timeslot] = (ChannelCombination) corrCode;
|
|
|
|
setModulus(timeslot);
|
|
|
|
sprintf(response,"RSP SETSLOT 0 %d %d",timeslot,corrCode);
|
|
|
|
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
LOG(WARN) << "bogus command " << command << " on control interface.";
|
|
|
|
}
|
|
|
|
|
|
|
|
mControlSocket.write(response,strlen(response)+1);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
bool Transceiver::driveTransmitPriorityQueue()
|
|
|
|
{
|
|
|
|
|
|
|
|
char buffer[gSlotLen+50];
|
|
|
|
|
|
|
|
// check data socket
|
|
|
|
size_t msgLen = mDataSocket.read(buffer);
|
|
|
|
|
|
|
|
if (msgLen!=gSlotLen+1+4+1) {
|
|
|
|
LOG(ERROR) << "badly formatted packet on GSM->TRX interface";
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
int timeSlot = (int) buffer[0];
|
|
|
|
uint64_t frameNum = 0;
|
|
|
|
for (int i = 0; i < 4; i++)
|
|
|
|
frameNum = (frameNum << 8) | (0x0ff & buffer[i+1]);
|
|
|
|
|
|
|
|
/*
|
|
|
|
if (GSM::Time(frameNum,timeSlot) > mTransmitDeadlineClock + GSM::Time(51,0)) {
|
|
|
|
// stale burst
|
|
|
|
//LOG(DEBUG) << "FAST! "<< GSM::Time(frameNum,timeSlot);
|
|
|
|
//writeClockInterface();
|
|
|
|
}*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
DAB -- Just let these go through the demod.
|
|
|
|
if (GSM::Time(frameNum,timeSlot) < mTransmitDeadlineClock) {
|
|
|
|
// stale burst from GSM core
|
|
|
|
LOG(NOTICE) << "STALE packet on GSM->TRX interface at time "<< GSM::Time(frameNum,timeSlot);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
*/
|
|
|
|
|
|
|
|
// periodically update GSM core clock
|
|
|
|
LOG(DEEPDEBUG) << "mTransmitDeadlineClock " << mTransmitDeadlineClock
|
|
|
|
<< " mLastClockUpdateTime " << mLastClockUpdateTime;
|
|
|
|
if (mTransmitDeadlineClock > mLastClockUpdateTime + GSM::Time(216,0))
|
|
|
|
writeClockInterface();
|
|
|
|
|
|
|
|
|
|
|
|
LOG(DEEPDEBUG) << "rcvd. burst at: " << GSM::Time(frameNum,timeSlot);
|
|
|
|
|
|
|
|
int RSSI = (int) buffer[5];
|
|
|
|
static BitVector newBurst(gSlotLen);
|
|
|
|
BitVector::iterator itr = newBurst.begin();
|
|
|
|
char *bufferItr = buffer+6;
|
|
|
|
while (itr < newBurst.end())
|
|
|
|
*itr++ = *bufferItr++;
|
|
|
|
|
|
|
|
GSM::Time currTime = GSM::Time(frameNum,timeSlot);
|
|
|
|
|
|
|
|
addRadioVector(newBurst,RSSI,currTime);
|
|
|
|
|
|
|
|
LOG(DEEPDEBUG) "added burst - time: " << currTime << ", RSSI: " << RSSI; // << ", data: " << newBurst;
|
|
|
|
|
|
|
|
return true;
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
void Transceiver::driveReceiveFIFO()
|
|
|
|
{
|
|
|
|
|
|
|
|
SoftVector *rxBurst = NULL;
|
|
|
|
int RSSI;
|
|
|
|
int TOA; // in 1/256 of a symbol
|
|
|
|
GSM::Time burstTime;
|
|
|
|
|
|
|
|
mRadioInterface->driveReceiveRadio();
|
|
|
|
|
|
|
|
rxBurst = pullRadioVector(burstTime,RSSI,TOA);
|
|
|
|
|
|
|
|
if (rxBurst) {
|
|
|
|
|
|
|
|
LOG(DEBUG) << "burst parameters: "
|
|
|
|
<< " time: " << burstTime
|
|
|
|
<< " RSSI: " << RSSI
|
|
|
|
<< " TOA: " << TOA
|
|
|
|
<< " bits: " << *rxBurst;
|
|
|
|
|
|
|
|
char burstString[gSlotLen+10];
|
|
|
|
burstString[0] = burstTime.TN();
|
|
|
|
for (int i = 0; i < 4; i++)
|
|
|
|
burstString[1+i] = (burstTime.FN() >> ((3-i)*8)) & 0x0ff;
|
|
|
|
burstString[5] = RSSI;
|
|
|
|
burstString[6] = (TOA >> 8) & 0x0ff;
|
|
|
|
burstString[7] = TOA & 0x0ff;
|
|
|
|
SoftVector::iterator burstItr = rxBurst->begin();
|
|
|
|
|
|
|
|
for (unsigned int i = 0; i < gSlotLen; i++) {
|
|
|
|
burstString[8+i] =(char) round((*burstItr++)*255.0);
|
|
|
|
}
|
|
|
|
burstString[gSlotLen+9] = '\0';
|
|
|
|
delete rxBurst;
|
|
|
|
|
|
|
|
mDataSocket.write(burstString,gSlotLen+10);
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
void Transceiver::driveTransmitFIFO()
|
|
|
|
{
|
|
|
|
|
|
|
|
/**
|
|
|
|
Features a carefully controlled latency mechanism, to
|
|
|
|
assure that transmit packets arrive at the radio/USRP
|
|
|
|
before they need to be transmitted.
|
|
|
|
|
|
|
|
Deadline clock indicates the burst that needs to be
|
|
|
|
pushed into the FIFO right NOW. If transmit queue does
|
|
|
|
not have a burst, stick in filler data.
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
RadioClock *radioClock = (mRadioInterface->getClock());
|
|
|
|
|
|
|
|
if (mOn) {
|
|
|
|
//radioClock->wait(); // wait until clock updates
|
|
|
|
LOG(DEBUG) << "radio clock " << radioClock->get();
|
|
|
|
while (radioClock->get() + mTransmitLatency > mTransmitDeadlineClock) {
|
|
|
|
// if underrun, then we're not providing bursts to radio/USRP fast
|
|
|
|
// enough. Need to increase latency by one GSM frame.
|
2011-05-23 19:02:56 +00:00
|
|
|
#ifndef USE_UHD
|
2010-05-24 02:42:16 +00:00
|
|
|
if (mRadioInterface->isUnderrun()) {
|
|
|
|
// only do latency update every 10 frames, so we don't over update
|
|
|
|
if (radioClock->get() > mLatencyUpdateTime + GSM::Time(10,0)) {
|
|
|
|
mTransmitLatency = mTransmitLatency + GSM::Time(1,0);
|
|
|
|
LOG(INFO) << "new latency: " << mTransmitLatency;
|
|
|
|
mLatencyUpdateTime = radioClock->get();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
// if underrun hasn't occurred in the last sec (216 frames) drop
|
|
|
|
// transmit latency by a timeslot
|
|
|
|
if (mTransmitLatency > GSM::Time(1,1)) {
|
|
|
|
if (radioClock->get() > mLatencyUpdateTime + GSM::Time(216,0)) {
|
|
|
|
mTransmitLatency.decTN();
|
|
|
|
LOG(INFO) << "reduced latency: " << mTransmitLatency;
|
|
|
|
mLatencyUpdateTime = radioClock->get();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2011-05-23 19:02:56 +00:00
|
|
|
#endif
|
2010-05-24 02:42:16 +00:00
|
|
|
// time to push burst to transmit FIFO
|
|
|
|
pushRadioVector(mTransmitDeadlineClock);
|
|
|
|
mTransmitDeadlineClock.incTN();
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
// FIXME -- This should not be a hard spin.
|
|
|
|
// But any delay here causes us to throw omni_thread_fatal.
|
|
|
|
//else radioClock->wait();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void Transceiver::writeClockInterface()
|
|
|
|
{
|
|
|
|
char command[50];
|
|
|
|
// FIXME -- This should be adaptive.
|
|
|
|
sprintf(command,"IND CLOCK %llu",(unsigned long long) (mTransmitDeadlineClock.FN()+2));
|
|
|
|
|
|
|
|
LOG(INFO) << "ClockInterface: sending " << command;
|
|
|
|
|
|
|
|
mClockSocket.write(command,strlen(command)+1);
|
|
|
|
|
|
|
|
mLastClockUpdateTime = mTransmitDeadlineClock;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void *FIFOServiceLoopAdapter(Transceiver *transceiver)
|
|
|
|
{
|
2011-05-07 00:48:43 +00:00
|
|
|
transceiver->setPriority();
|
|
|
|
|
2010-05-24 02:42:16 +00:00
|
|
|
while (1) {
|
|
|
|
transceiver->driveReceiveFIFO();
|
|
|
|
transceiver->driveTransmitFIFO();
|
|
|
|
pthread_testcancel();
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
void *ControlServiceLoopAdapter(Transceiver *transceiver)
|
|
|
|
{
|
|
|
|
while (1) {
|
|
|
|
transceiver->driveControl();
|
|
|
|
pthread_testcancel();
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
void *TransmitPriorityQueueServiceLoopAdapter(Transceiver *transceiver)
|
|
|
|
{
|
|
|
|
while (1) {
|
|
|
|
bool stale = false;
|
|
|
|
// Flush the UDP packets until a successful transfer.
|
|
|
|
while (!transceiver->driveTransmitPriorityQueue()) {
|
|
|
|
stale = true;
|
|
|
|
}
|
|
|
|
if (stale) {
|
|
|
|
// If a packet was stale, remind the GSM stack of the clock.
|
|
|
|
transceiver->writeClockInterface();
|
|
|
|
}
|
|
|
|
pthread_testcancel();
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|