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osmo-trx/Transceiver52M/Transceiver.cpp

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/*
* Copyright 2008, 2009, 2010, 2012 Free Software Foundation, Inc.
* Copyright 2013 Alexander Chemeris <Alexander.Chemeris@fairwaves.ru>
*
* 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>
#include "RTMD.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
using namespace GSM;
#define USB_LATENCY_INTRVL 10,0
#if USE_UHD
# define USB_LATENCY_MIN 6,7
#else
# define USB_LATENCY_MIN 1,1
#endif
#define INIT_ENERGY_THRSHD 5.0f
Transceiver::Transceiver(int wBasePort, const char *TRXAddress,
DriveLoop *wDriveLoop, RadioInterface *wRadioInterface,
int wSamplesPerSymbol, int wChannel, bool wPrimary)
:mBasePort(wBasePort), mTRXAddress(TRXAddress),
mDataSocket(wBasePort+2,TRXAddress,wBasePort+102),
mControlSocket(wBasePort+1,TRXAddress,wBasePort+101),
mDriveLoop(wDriveLoop), mRadioInterface(wRadioInterface),
mSamplesPerSymbol(wSamplesPerSymbol), mTransmitPriorityQueue(NULL),
mChannel(wChannel), mPrimary(wPrimary)
{
mMaxExpectedDelay = 0;
// generate pulse and setup up signal processing library
gsmPulse = generateGSMPulse(2,mSamplesPerSymbol);
LOG(DEBUG) << "gsmPulse: " << *gsmPulse;
mTransmitPriorityQueue = mDriveLoop->priorityQueue(mChannel);
mReceiveFIFO = mRadioInterface->receiveFIFO(mChannel);
txFullScale = mRadioInterface->fullScaleInputValue();
rxFullScale = mRadioInterface->fullScaleOutputValue();
// initialize per-timeslot variables
for (int i = 0; i < 8; i++) {
channelResponse[i] = NULL;
DFEForward[i] = NULL;
DFEFeedback[i] = NULL;
channelEstimateTime[i] = mDriveLoop->getStartTime();
}
mOn = false;
mRunning = false;
mTxFreq = 0.0;
mRxFreq = 0.0;
mFreqOffset = 0.0;
mPower = -10;
mEnergyThreshold = INIT_ENERGY_THRSHD;
prevFalseDetectionTime = mDriveLoop->getStartTime();
}
Transceiver::~Transceiver()
{
// Stop all threads before freeing up
mFIFOServiceLoop.shutdown();
mControlServiceLoop.shutdown();
mTransmitPriorityQueueServiceLoop.shutdown();
// Now free all allocated data
delete gsmPulse;
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;
}
SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
int &RSSI,
int &timingOffset)
{
RTMD_SET("TRX-pullRadioVector");
bool needDFE = (mMaxExpectedDelay > 1);
radioVector *rxBurst = (radioVector *) mReceiveFIFO->read();
if (!rxBurst) {
RTMD_VAL("TRX-pullRadioVector", -1);
RTMD_CLEAR("TRX-pullRadioVector");
return NULL;
}
LOG(DEBUG) << "receiveFIFO: read radio vector at time: " << rxBurst->getTime() << ", new size: " << mReceiveFIFO->size();
int timeslot = rxBurst->getTime().TN();
DriveLoop::CorrType corrType = mDriveLoop->expectedCorrType(mChannel, rxBurst->getTime());
if ((corrType == DriveLoop::OFF) || (corrType == DriveLoop::IDLE)) {
delete rxBurst;
RTMD_VAL("TRX-pullRadioVector", -2);
RTMD_CLEAR("TRX-pullRadioVector");
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->getTime();
double framesElapsed = rxBurst->getTime()-prevFalseDetectionTime;
if (framesElapsed > 50) { // if we haven't had any false detections for a while, lower threshold
mEnergyThreshold -= 10.0/10.0;
if (mEnergyThreshold < 0.0)
mEnergyThreshold = 0.0;
prevFalseDetectionTime = rxBurst->getTime();
}
delete rxBurst;
RTMD_VAL("TRX-pullRadioVector", -3);
RTMD_CLEAR("TRX-pullRadioVector");
return NULL;
}
LOG(DEBUG) << "Estimated Energy: " << sqrt(avgPwr) << ", at time " << rxBurst->getTime();
// run the proper correlator
bool success = false;
if (corrType == DriveLoop::TSC) {
LOG(DEBUG) << "looking for TSC at time: " << rxBurst->getTime();
signalVector *channelResp;
double framesElapsed = rxBurst->getTime()-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,
&amplitude,
&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->getTime();
LOG(DEBUG) << "SNR: " << SNRestimate[timeslot] << ", DFE forward: " << *DFEForward[timeslot] << ", DFE backward: " << *DFEFeedback[timeslot];
}
}
else {
double framesElapsed = rxBurst->getTime()-prevFalseDetectionTime;
LOG(DEBUG) << "wTime: " << rxBurst->getTime() << ", pTime: " << prevFalseDetectionTime << ", fElapsed: " << framesElapsed;
mEnergyThreshold += 10.0F/10.0F*exp(-framesElapsed);
prevFalseDetectionTime = rxBurst->getTime();
channelResponse[timeslot] = NULL;
}
}
else {
// RACH burst
success = detectRACHBurst(*vectorBurst,
5.0, // detection threshold
mSamplesPerSymbol,
&amplitude,
&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->getTime()-prevFalseDetectionTime;
mEnergyThreshold += (1.0F/10.0F)*exp(-framesElapsed);
prevFalseDetectionTime = rxBurst->getTime();
}
}
LOG(DEBUG) << "energy Threshold = " << mEnergyThreshold;
RTMD_VAL("TRX-EnergyThresh", int(mEnergyThreshold*10));
// demodulate burst
SoftVector *burst = NULL;
if ((rxBurst) && (success)) {
if ((corrType == DriveLoop::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->getTime();
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;
RTMD_CLEAR("TRX-pullRadioVector");
return burst;
}
void Transceiver::pullFIFO()
{
RTMD_SET("TRX-pullFIFO");
SoftVector *rxBurst = NULL;
int RSSI;
int TOA; // in 1/256 of a symbol
GSM::Time burstTime;
rxBurst = pullRadioVector(burstTime,RSSI,TOA);
if (rxBurst) {
LOG(DEBUG) << "burst parameters: "
<< " time: " << burstTime
<< " RSSI: " << RSSI
<< " TOA: " << TOA
<< " bits: " << *rxBurst;
RTMD_VAL("TRX-RSSI", RSSI);
RTMD_CLEAR("TRX-RSSI");
RTMD_VAL("TRX-TOA", TOA);
RTMD_CLEAR("TRX-TOA");
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);
}
RTMD_CLEAR("TRX-pullFIFO");
}
void Transceiver::start()
{
mRunning = true;
mControlServiceLoop.startThread((void*) this);
if (!mPrimary) {
mOn = true;
mFIFOServiceLoop.startThread((void*) this);
mTransmitPriorityQueueServiceLoop.startThread((void*) this);
}
}
void Transceiver::shutdown()
{
mOn = false;
mRunning = false;
mControlServiceLoop.shutdown();
mFIFOServiceLoop.shutdown();
mTransmitPriorityQueueServiceLoop.shutdown();
}
void Transceiver::reset()
{
mTransmitPriorityQueue->clear();
}
void Transceiver::driveControl()
{
RTMD_SET("driveControl");
int MAX_PACKET_LENGTH = 100;
// check control socket
char buffer[MAX_PACKET_LENGTH];
int msgLen = -1;
buffer[0] = '\0';
try {
msgLen = mControlSocket.read(buffer);
if (msgLen < 1) {
RTMD_VAL("driveControl", -1);
RTMD_CLEAR("driveControl");
return;
}
} catch (...) {
/* Ignore the read exception on shutdown */
if (!mRunning) {
RTMD_VAL("driveControl", -2);
RTMD_CLEAR("driveControl");
return;
}
LOG(ALERT) << "Caught UHD socket exception";
RTMD_VAL("driveControl", -3);
RTMD_CLEAR("driveControl");
return;
}
char cmdcheck[4];
char command[MAX_PACKET_LENGTH];
char response[MAX_PACKET_LENGTH];
sscanf(buffer,"%3s %s",cmdcheck,command);
mDriveLoop->writeClockInterface();
if (strcmp(cmdcheck,"CMD")!=0) {
LOG(WARNING) << "bogus message on control interface";
RTMD_VAL("driveControl", -4);
RTMD_CLEAR("driveControl");
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 || (mTSC<0))
sprintf(response,"RSP POWERON 1");
else {
sprintf(response,"RSP POWERON 0");
if (mPrimary && !mOn) {
// Prepare for thread start
mPower = -20;
mRadioInterface->start();
mDriveLoop->startThread();
mDriveLoop->writeClockInterface();
generateRACHSequence(*gsmPulse,mSamplesPerSymbol);
// Start radio interface threads.
mOn = true;
mFIFOServiceLoop.startThread((void*) this);
mTransmitPriorityQueueServiceLoop.startThread((void*) this);
}
}
}
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);
mEnergyThreshold = INIT_ENERGY_THRSHD;
newGain = mRadioInterface->setRxGain(newGain, mChannel);
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(dbPwr, mChannel);
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);
}
}
else if (strcmp(command,"RXTUNE")==0) {
// tune receiver
int freqKhz;
sscanf(buffer,"%3s %s %d",cmdcheck,command,&freqKhz);
mRxFreq = freqKhz * 1.0e3 + mFreqOffset;
if (!mRadioInterface->tuneRx(mRxFreq, mChannel)) {
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 + mFreqOffset;
if (!mRadioInterface->tuneTx(mTxFreq, mChannel)) {
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 || (TSC<0) || (TSC>7))
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 slot type
int corrCode;
int timeslot;
sscanf(buffer,"%3s %s %d %d",cmdcheck,command,&timeslot,&corrCode);
if ((timeslot < 0) || (timeslot > 7)) {
LOG(WARNING) << "bogus message on control interface";
sprintf(response,"RSP SETSLOT 1 %d %d",timeslot,corrCode);
RTMD_VAL("driveControl", -5);
RTMD_CLEAR("driveControl");
return;
}
mDriveLoop->setTimeslot(mChannel, timeslot, (DriveLoop::ChannelCombination) corrCode);
mDriveLoop->setModulus(mChannel, timeslot);
sprintf(response,"RSP SETSLOT 0 %d %d",timeslot,corrCode);
}
else {
LOG(WARNING) << "bogus command " << command << " on control interface.";
sprintf(response,"RSP ERR 1");
}
mControlSocket.write(response,strlen(response)+1);
RTMD_CLEAR("driveControl");
}
bool Transceiver::driveTransmitPriorityQueue()
{
RTMD_SET("TRX-drvTxPQueue");
char buffer[gSlotLen+50];
if (!mOn) {
RTMD_VAL("TRX-drvTxPQueue", -1);
RTMD_CLEAR("TRX-drvTxPQueue");
return true;
}
try {
size_t msgLen = mDataSocket.read(buffer);
if (msgLen!=gSlotLen+1+4+1) {
LOG(ERR) << "badly formatted packet on GSM->TRX interface";
RTMD_VAL("TRX-drvTxPQueue", -2);
RTMD_CLEAR("TRX-drvTxPQueue");
return false;
}
} catch (...) {
if (!mOn) {
/* Shutdown condition. End the thread. */
RTMD_VAL("TRX-drvTxPQueue", -3);
RTMD_CLEAR("TRX-drvTxPQueue");
return true;
}
LOG(ALERT) << "Caught UHD socket exception";
RTMD_VAL("TRX-drvTxPQueue", -4);
RTMD_CLEAR("TRX-drvTxPQueue");
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]);
// periodically update GSM core clock
LOG(DEBUG) << "mTransmitDeadlineClock " << mDriveLoop->getDeadlineClock()
<< " mLastClockUpdateTime " << mDriveLoop->getLastClockUpdate();
if (mDriveLoop->getDeadlineClock() > mDriveLoop->getLastClockUpdate() + GSM::Time(216,0)) {
mDriveLoop->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;
RTMD_CLEAR("TRX-drvTxPQueue");
return true;
}
Thread::ReturnStatus FIFOServiceLoopThread::shutdown()
{
Transceiver *transceiver = (Transceiver *)mThreadData;
if (transceiver == NULL)
// Nothing to do
return ALREADY_IDLE;
transceiver->mFIFOServiceLoop.requestThreadStop();
if (transceiver->mReceiveFIFO != NULL) {
// Write twice, because read() function may read twice in case of NULL.
transceiver->mReceiveFIFO->write(NULL);
transceiver->mReceiveFIFO->write(NULL);
}
return transceiver->mFIFOServiceLoop.stopThread();
}
void FIFOServiceLoopThread::runThread()
{
Transceiver *transceiver = (Transceiver *)mThreadData;
while (isThreadRunning()) {
transceiver->pullFIFO();
}
LOG(DEBUG) << "FIFOServiceLoopThread has finished operations";
}
Thread::ReturnStatus ControlServiceLoopThread::shutdown()
{
Transceiver *transceiver = (Transceiver *)mThreadData;
if (transceiver == NULL)
// Nothing to do
return ALREADY_IDLE;
transceiver->mControlServiceLoop.requestThreadStop();
// FIXME: We should use shutdown() here, but the socket should be
// re-openned on the next start() then. Righ now the socket
// is created in the constructor and if we shutdown() it here,
// we'll get errors when we try to use it on the next start.
// transceiver->mControlSocket.shutdown();
{
// mBasePort+1 is mControlSocket port
UDPSocket tmpSock(0, "127.0.0.1", transceiver->mBasePort+1);
tmpSock.write(NULL, 0);
}
return transceiver->mControlServiceLoop.stopThread();
}
void ControlServiceLoopThread::runThread()
{
Transceiver *transceiver = (Transceiver *)mThreadData;
while (isThreadRunning()) {
transceiver->driveControl();
}
LOG(DEBUG) << "ControlServiceLoopThread has finished operations";
}
Thread::ReturnStatus TransmitPriorityQueueServiceLoopThread::shutdown()
{
Transceiver *transceiver = (Transceiver *)mThreadData;
if (transceiver == NULL)
// Nothing to do
return ALREADY_IDLE;
transceiver->mTransmitPriorityQueueServiceLoop.requestThreadStop();
// FIXME: We should use shutdown() here, but the socket should be
// re-openned on the next start() then. Righ now the socket
// is created in the constructor and if we shutdown() it here,
// we'll get errors when we try to use it on the next start.
// transceiver->mDataSocket.shutdown();
{
// mBasePort+2 is mDataSocket port
UDPSocket tmpSock(0, "127.0.0.1", transceiver->mBasePort+2);
tmpSock.write(NULL, 0);
}
return transceiver->mTransmitPriorityQueueServiceLoop.stopThread();
}
void TransmitPriorityQueueServiceLoopThread::runThread()
{
Transceiver *transceiver = (Transceiver *)mThreadData;
while (isThreadRunning()) {
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->getDriveLoop()->writeClockInterface();
}
}
LOG(DEBUG) << "TransmitPriorityQueueServiceLoopThread has finished operations";
}
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