| /* |
| * Copyright 2008, 2009, 2010 Free Software Foundation, Inc. |
| * |
| * This software is distributed under the terms of the GNU Public License. |
| * See the COPYING file in the main directory for details. |
| * |
| * This use of this software may be subject to additional restrictions. |
| * See the LEGAL file in the main directory for details. |
| |
| This program 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 of the License, or |
| (at your option) any later version. |
| |
| This program 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 this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| |
| /* |
| Compilation switches |
| TRANSMIT_LOGGING write every burst on the given slot to a log |
| */ |
| |
| |
| #include <stdio.h> |
| #include "Transceiver.h" |
| #include <Logger.h> |
| |
| |
| |
| Transceiver::Transceiver(int wBasePort, |
| const char *TRXAddress, |
| int wSamplesPerSymbol, |
| GSM::Time wTransmitLatency, |
| RadioInterface *wRadioInterface) |
| :mDataSocket(wBasePort+2,TRXAddress,wBasePort+102), |
| mControlSocket(wBasePort+1,TRXAddress,wBasePort+101), |
| mClockSocket(wBasePort,TRXAddress,wBasePort+100) |
| { |
| //GSM::Time startTime(0,0); |
| //GSM::Time startTime(gHyperframe/2 - 4*216*60,0); |
| GSM::Time startTime(random() % gHyperframe,0); |
| |
| mFIFOServiceLoopThread = new Thread(32768); ///< thread to push bursts into transmit FIFO |
| mControlServiceLoopThread = new Thread(32768); ///< thread to process control messages from GSM core |
| mTransmitPriorityQueueServiceLoopThread = new Thread(32768);///< thread to process transmit bursts from GSM core |
| |
| |
| mSamplesPerSymbol = wSamplesPerSymbol; |
| mRadioInterface = wRadioInterface; |
| mTransmitLatency = wTransmitLatency; |
| mTransmitDeadlineClock = startTime; |
| mLastClockUpdateTime = startTime; |
| mLatencyUpdateTime = startTime; |
| mRadioInterface->getClock()->set(startTime); |
| mMaxExpectedDelay = 0; |
| |
| // generate pulse and setup up signal processing library |
| gsmPulse = generateGSMPulse(2,mSamplesPerSymbol); |
| LOG(DEBUG) << "gsmPulse: " << *gsmPulse; |
| sigProcLibSetup(mSamplesPerSymbol); |
| |
| txFullScale = mRadioInterface->fullScaleInputValue(); |
| rxFullScale = mRadioInterface->fullScaleOutputValue(); |
| |
| // initialize filler tables with dummy bursts, initialize other per-timeslot variables |
| for (int i = 0; i < 8; i++) { |
| signalVector* modBurst = modulateBurst(gDummyBurst,*gsmPulse, |
| 8 + (i % 4 == 0), |
| mSamplesPerSymbol); |
| scaleVector(*modBurst,txFullScale); |
| fillerModulus[i]=26; |
| for (int j = 0; j < 102; j++) { |
| fillerTable[j][i] = new signalVector(*modBurst); |
| } |
| delete modBurst; |
| mChanType[i] = NONE; |
| channelResponse[i] = NULL; |
| DFEForward[i] = NULL; |
| DFEFeedback[i] = NULL; |
| channelEstimateTime[i] = startTime; |
| } |
| |
| mOn = false; |
| mTxFreq = 0.0; |
| mRxFreq = 0.0; |
| mPower = -10; |
| mEnergyThreshold = 5.0; // based on empirical data |
| prevFalseDetectionTime = startTime; |
| } |
| |
| Transceiver::~Transceiver() |
| { |
| delete gsmPulse; |
| sigProcLibDestroy(); |
| mTransmitPriorityQueue.clear(); |
| } |
| |
| |
| void Transceiver::addRadioVector(BitVector &burst, |
| int RSSI, |
| GSM::Time &wTime) |
| { |
| // modulate and stick into queue |
| signalVector* modBurst = modulateBurst(burst,*gsmPulse, |
| 8 + (wTime.TN() % 4 == 0), |
| mSamplesPerSymbol); |
| scaleVector(*modBurst,txFullScale * pow(10,-RSSI/10)); |
| radioVector *newVec = new radioVector(*modBurst,wTime); |
| mTransmitPriorityQueue.write(newVec); |
| |
| delete modBurst; |
| } |
| |
| #ifdef TRANSMIT_LOGGING |
| void Transceiver::unModulateVector(signalVector wVector) |
| { |
| SoftVector *burst = demodulateBurst(wVector, |
| *gsmPulse, |
| mSamplesPerSymbol, |
| 1.0,0.0); |
| LOG(DEBUG) << "LOGGED BURST: " << *burst; |
| |
| /* |
| unsigned char burstStr[gSlotLen+1]; |
| SoftVector::iterator burstItr = burst->begin(); |
| for (int i = 0; i < gSlotLen; i++) { |
| // FIXME: Demod bits are inverted! |
| burstStr[i] = (unsigned char) ((*burstItr++)*255.0); |
| } |
| burstStr[gSlotLen]='\0'; |
| LOG(DEBUG) << "LOGGED BURST: " << burstStr; |
| */ |
| delete burst; |
| } |
| #endif |
| |
| void Transceiver::pushRadioVector(GSM::Time &nowTime) |
| { |
| |
| // dump stale bursts, if any |
| while (radioVector* staleBurst = mTransmitPriorityQueue.getStaleBurst(nowTime)) { |
| // Even if the burst is stale, put it in the fillter table. |
| // (It might be an idle pattern.) |
| LOG(NOTICE) << "dumping STALE burst in TRX->USRP interface"; |
| const GSM::Time& nextTime = staleBurst->time(); |
| int TN = nextTime.TN(); |
| int modFN = nextTime.FN() % fillerModulus[TN]; |
| delete fillerTable[modFN][TN]; |
| fillerTable[modFN][TN] = staleBurst; |
| } |
| |
| int TN = nowTime.TN(); |
| int modFN = nowTime.FN() % fillerModulus[nowTime.TN()]; |
| |
| // if queue contains data at the desired timestamp, stick it into FIFO |
| if (radioVector *next = (radioVector*) mTransmitPriorityQueue.getCurrentBurst(nowTime)) { |
| LOG(DEBUG) << "transmitFIFO: wrote burst " << next << " at time: " << nowTime; |
| delete fillerTable[modFN][TN]; |
| fillerTable[modFN][TN] = new signalVector(*(next)); |
| mRadioInterface->driveTransmitRadio(*(next),(mChanType[TN]==NONE)); //fillerTable[modFN][TN])); |
| delete next; |
| #ifdef TRANSMIT_LOGGING |
| if (nowTime.TN()==TRANSMIT_LOGGING) { |
| unModulateVector(*(fillerTable[modFN][TN])); |
| } |
| #endif |
| return; |
| } |
| |
| // otherwise, pull filler data, and push to radio FIFO |
| mRadioInterface->driveTransmitRadio(*(fillerTable[modFN][TN]),(mChanType[TN]==NONE)); |
| #ifdef TRANSMIT_LOGGING |
| if (nowTime.TN()==TRANSMIT_LOGGING) |
| unModulateVector(*fillerTable[modFN][TN]); |
| #endif |
| |
| } |
| |
| void Transceiver::setModulus(int timeslot) |
| { |
| switch (mChanType[timeslot]) { |
| case NONE: |
| case I: |
| case II: |
| case III: |
| case FILL: |
| fillerModulus[timeslot] = 26; |
| break; |
| case IV: |
| case VI: |
| case V: |
| fillerModulus[timeslot] = 51; |
| break; |
| //case V: |
| case VII: |
| fillerModulus[timeslot] = 102; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| |
| Transceiver::CorrType Transceiver::expectedCorrType(GSM::Time currTime) |
| { |
| |
| unsigned burstTN = currTime.TN(); |
| unsigned burstFN = currTime.FN(); |
| |
| switch (mChanType[burstTN]) { |
| case NONE: |
| return OFF; |
| break; |
| case FILL: |
| return IDLE; |
| break; |
| case I: |
| return TSC; |
| /*if (burstFN % 26 == 25) |
| return IDLE; |
| else |
| return TSC;*/ |
| break; |
| case II: |
| if (burstFN % 2 == 1) |
| return IDLE; |
| else |
| return TSC; |
| break; |
| case III: |
| return TSC; |
| break; |
| case IV: |
| case VI: |
| return RACH; |
| break; |
| case V: { |
| int mod51 = burstFN % 51; |
| if ((mod51 <= 36) && (mod51 >= 14)) |
| return RACH; |
| else if ((mod51 == 4) || (mod51 == 5)) |
| return RACH; |
| else if ((mod51 == 45) || (mod51 == 46)) |
| return RACH; |
| else |
| return TSC; |
| break; |
| } |
| case VII: |
| if ((burstFN % 51 <= 14) && (burstFN % 51 >= 12)) |
| return IDLE; |
| else |
| return TSC; |
| break; |
| case LOOPBACK: |
| if ((burstFN % 51 <= 50) && (burstFN % 51 >=48)) |
| return IDLE; |
| else |
| return TSC; |
| break; |
| default: |
| return OFF; |
| break; |
| } |
| |
| } |
| |
| SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime, |
| int &RSSI, |
| int &timingOffset) |
| { |
| bool needDFE = (mMaxExpectedDelay > 1); |
| |
| radioVector *rxBurst = (radioVector *) mReceiveFIFO->get(); |
| |
| if (!rxBurst) return NULL; |
| |
| LOG(DEBUG) << "receiveFIFO: read radio vector at time: " << rxBurst->time() << ", new size: " << mReceiveFIFO->size(); |
| |
| int timeslot = rxBurst->time().TN(); |
| |
| CorrType corrType = expectedCorrType(rxBurst->time()); |
| |
| if ((corrType==OFF) || (corrType==IDLE)) { |
| delete rxBurst; |
| return NULL; |
| } |
| |
| // check to see if received burst has sufficient |
| signalVector *vectorBurst = rxBurst; |
| complex amplitude = 0.0; |
| float TOA = 0.0; |
| float avgPwr = 0.0; |
| if (!energyDetect(*vectorBurst,20*mSamplesPerSymbol,mEnergyThreshold,&avgPwr)) { |
| LOG(DEBUG) << "Estimated Energy: " << sqrt(avgPwr) << ", at time " << rxBurst->time(); |
| double framesElapsed = rxBurst->time()-prevFalseDetectionTime; |
| if (framesElapsed > 50) { // if we haven't had any false detections for a while, lower threshold |
| mEnergyThreshold -= 10.0/10.0; |
| prevFalseDetectionTime = rxBurst->time(); |
| } |
| delete rxBurst; |
| return NULL; |
| } |
| LOG(DEBUG) << "Estimated Energy: " << sqrt(avgPwr) << ", at time " << rxBurst->time(); |
| |
| // run the proper correlator |
| bool success = false; |
| if (corrType==TSC) { |
| LOG(DEBUG) << "looking for TSC at time: " << rxBurst->time(); |
| signalVector *channelResp; |
| double framesElapsed = rxBurst->time()-channelEstimateTime[timeslot]; |
| bool estimateChannel = false; |
| if ((framesElapsed > 50) || (channelResponse[timeslot]==NULL)) { |
| if (channelResponse[timeslot]) delete channelResponse[timeslot]; |
| if (DFEForward[timeslot]) delete DFEForward[timeslot]; |
| if (DFEFeedback[timeslot]) delete DFEFeedback[timeslot]; |
| channelResponse[timeslot] = NULL; |
| DFEForward[timeslot] = NULL; |
| DFEFeedback[timeslot] = NULL; |
| estimateChannel = true; |
| } |
| if (!needDFE) estimateChannel = false; |
| float chanOffset; |
| success = analyzeTrafficBurst(*vectorBurst, |
| mTSC, |
| 3.0, |
| mSamplesPerSymbol, |
| &litude, |
| &TOA, |
| mMaxExpectedDelay, |
| estimateChannel, |
| &channelResp, |
| &chanOffset); |
| if (success) { |
| LOG(DEBUG) << "FOUND TSC!!!!!! " << amplitude << " " << TOA; |
| mEnergyThreshold -= 1.0F/10.0F; |
| if (mEnergyThreshold < 0.0) mEnergyThreshold = 0.0; |
| SNRestimate[timeslot] = amplitude.norm2()/(mEnergyThreshold*mEnergyThreshold+1.0); // this is not highly accurate |
| if (estimateChannel) { |
| LOG(DEBUG) << "estimating channel..."; |
| channelResponse[timeslot] = channelResp; |
| chanRespOffset[timeslot] = chanOffset; |
| chanRespAmplitude[timeslot] = amplitude; |
| scaleVector(*channelResp, complex(1.0,0.0)/amplitude); |
| designDFE(*channelResp, SNRestimate[timeslot], 7, &DFEForward[timeslot], &DFEFeedback[timeslot]); |
| channelEstimateTime[timeslot] = rxBurst->time(); |
| LOG(DEBUG) << "SNR: " << SNRestimate[timeslot] << ", DFE forward: " << *DFEForward[timeslot] << ", DFE backward: " << *DFEFeedback[timeslot]; |
| } |
| } |
| else { |
| double framesElapsed = rxBurst->time()-prevFalseDetectionTime; |
| LOG(DEBUG) << "wTime: " << rxBurst->time() << ", pTime: " << prevFalseDetectionTime << ", fElapsed: " << framesElapsed; |
| mEnergyThreshold += 10.0F/10.0F*exp(-framesElapsed); |
| 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(); |
| // FIXME: what is full scale for the USRP? we get more that 12 bits of resolution... |
| RSSI = (int) floor(20.0*log10(rxFullScale/amplitude.abs())); |
| LOG(DEBUG) << "RSSI: " << RSSI; |
| timingOffset = (int) round(TOA*256.0/mSamplesPerSymbol); |
| } |
| |
| //if (burst) LOG(DEBUG) << "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(WARNING) << "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; |
| mRadioInterface->setPowerAttenuation(pow(10.0,dbPwr/10.0)); |
| 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(ALERT) << "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(ALERT) << "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(WARNING) << "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(WARNING) << "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(ERR) << "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(DEBUG) << "mTransmitDeadlineClock " << mTransmitDeadlineClock |
| << " mLastClockUpdateTime " << mLastClockUpdateTime; |
| if (mTransmitDeadlineClock > mLastClockUpdateTime + GSM::Time(216,0)) |
| writeClockInterface(); |
| |
| |
| LOG(DEBUG) << "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(DEBUG) "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. |
| 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(); |
| } |
| } |
| } |
| // 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) |
| { |
| transceiver->setPriority(); |
| |
| 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; |
| } |