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Transceiver52M: Rename samples-per-symbol variable names

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Because repeatedly typing mSamplesPerSymbol is giving me
carpal tunnel syndrome. Replace with the much shorter,
easier to type, and just as clear name of 'sps'.

Signed-off-by: Thomas Tsou <tom@tsou.cc>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6727 19bc5d8c-e614-43d4-8b26-e1612bc8e597
This commit is contained in:
Thomas Tsou
2013-10-17 06:17:50 +00:00
parent 98ebd4963d
commit ecc81ab384
6 changed files with 95 additions and 94 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
Transceiver52M/Transceiver.cpp
View File

@@ -48,7 +48,7 @@
Transceiver::Transceiver(int wBasePort,
const char *TRXAddress,
int wSamplesPerSymbol,
int wSPS,
GSM::Time wTransmitLatency,
RadioInterface *wRadioInterface)
:mDataSocket(wBasePort+2,TRXAddress,wBasePort+102),
@@ -64,7 +64,7 @@ Transceiver::Transceiver(int wBasePort,
mTransmitPriorityQueueServiceLoopThread = new Thread(32768);///< thread to process transmit bursts from GSM core
mSamplesPerSymbol = wSamplesPerSymbol;
mSPS = wSPS;
mRadioInterface = wRadioInterface;
mTransmitLatency = wTransmitLatency;
mTransmitDeadlineClock = startTime;
@@ -74,9 +74,9 @@ Transceiver::Transceiver(int wBasePort,
mMaxExpectedDelay = 0;
// generate pulse and setup up signal processing library
gsmPulse = generateGSMPulse(2,mSamplesPerSymbol);
gsmPulse = generateGSMPulse(2, mSPS);
LOG(DEBUG) << "gsmPulse: " << *gsmPulse;
sigProcLibSetup(mSamplesPerSymbol);
sigProcLibSetup(mSPS);
txFullScale = mRadioInterface->fullScaleInputValue();
rxFullScale = mRadioInterface->fullScaleOutputValue();
@@ -85,7 +85,7 @@ Transceiver::Transceiver(int wBasePort,
for (int i = 0; i < 8; i++) {
signalVector* modBurst = modulateBurst(gDummyBurst,*gsmPulse,
8 + (i % 4 == 0),
mSamplesPerSymbol);
mSPS);
scaleVector(*modBurst,txFullScale);
fillerModulus[i]=26;
for (int j = 0; j < 102; j++) {
@@ -123,7 +123,7 @@ radioVector *Transceiver::fixRadioVector(BitVector &burst,
// modulate and stick into queue
signalVector* modBurst = modulateBurst(burst,*gsmPulse,
8 + (wTime.TN() % 4 == 0),
mSamplesPerSymbol);
mSPS);
scaleVector(*modBurst,txFullScale * pow(10,-RSSI/10));
radioVector *newVec = new radioVector(*modBurst,wTime);
@@ -138,7 +138,7 @@ void Transceiver::unModulateVector(signalVector wVector)
{
SoftVector *burst = demodulateBurst(wVector,
*gsmPulse,
mSamplesPerSymbol,
mSPS,
1.0,0.0);
LOG(DEBUG) << "LOGGED BURST: " << *burst;
@@ -344,7 +344,7 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
complex amplitude = 0.0;
float TOA = 0.0;
float avgPwr = 0.0;
if (!energyDetect(*vectorBurst,20*mSamplesPerSymbol,mEnergyThreshold,&avgPwr)) {
if (!energyDetect(*vectorBurst, 20 * mSPS, 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
@@ -380,7 +380,7 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
success = analyzeTrafficBurst(*vectorBurst,
mTSC,
3.0,
mSamplesPerSymbol,
mSPS,
&amplitude,
&TOA,
mMaxExpectedDelay,
@@ -415,7 +415,7 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
// RACH burst
success = detectRACHBurst(*vectorBurst,
5.0, // detection threshold
mSamplesPerSymbol,
mSPS,
&amplitude,
&TOA);
if (success) {
@@ -438,21 +438,21 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
if ((corrType==RACH) || (!needDFE)) {
burst = demodulateBurst(*vectorBurst,
*gsmPulse,
mSamplesPerSymbol,
mSPS,
amplitude,TOA);
}
else { // TSC
scaleVector(*vectorBurst,complex(1.0,0.0)/amplitude);
burst = equalizeBurst(*vectorBurst,
TOA-chanRespOffset[timeslot],
mSamplesPerSymbol,
mSPS,
*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);
timingOffset = (int) round(TOA * 256.0 / mSPS);
}
//if (burst) LOG(DEBUG) << "burst: " << *burst << '\n';
@@ -519,7 +519,7 @@ void Transceiver::driveControl()
// Prepare for thread start
mPower = -20;
mRadioInterface->start();
generateRACHSequence(*gsmPulse,mSamplesPerSymbol);
generateRACHSequence(*gsmPulse, mSPS);
// Start radio interface threads.
mFIFOServiceLoopThread->start((void * (*)(void*))FIFOServiceLoopAdapter,(void*) this);
@@ -611,7 +611,7 @@ void Transceiver::driveControl()
sprintf(response,"RSP SETTSC 1 %d",TSC);
else {
mTSC = TSC;
generateMidamble(*gsmPulse,mSamplesPerSymbol,TSC);
generateMidamble(*gsmPulse, mSPS, TSC);
sprintf(response,"RSP SETTSC 0 %d",TSC);
}
}

6
Transceiver52M/Transceiver.h
View File

@@ -121,7 +121,7 @@ private:
signalVector *gsmPulse; ///< the GSM shaping pulse for modulation
int mSamplesPerSymbol; ///< number of samples per GSM symbol
int mSPS; ///< number of samples per GSM symbol
bool mOn; ///< flag to indicate that transceiver is powered on
ChannelCombination mChanType[8]; ///< channel types for all timeslots
@@ -148,13 +148,13 @@ public:
/** Transceiver constructor
@param wBasePort base port number of UDP sockets
@param TRXAddress IP address of the TRX manager, as a string
@param wSamplesPerSymbol number of samples per GSM symbol
@param wSPS number of samples per GSM symbol
@param wTransmitLatency initial setting of transmit latency
@param radioInterface associated radioInterface object
*/
Transceiver(int wBasePort,
const char *TRXAddress,
int wSamplesPerSymbol,
int wSPS,
GSM::Time wTransmitLatency,
RadioInterface *wRadioInterface);

14
Transceiver52M/radioInterface.cpp
View File

@@ -55,7 +55,7 @@ RadioInterface::RadioInterface(RadioDevice *wRadio,
GSM::Time wStartTime)
: underrun(false), sendCursor(0), rcvCursor(0), mOn(false),
mRadio(wRadio), receiveOffset(wReceiveOffset),
samplesPerSymbol(wSPS), powerScaling(1.0),
sps(wSPS), powerScaling(1.0),
loadTest(false)
{
mClock.set(wStartTime);
@@ -150,8 +150,8 @@ void RadioInterface::start()
mRadio->updateAlignment(writeTimestamp-10000);
mRadio->updateAlignment(writeTimestamp-10000);
sendBuffer = new float[2*2*INCHUNK*samplesPerSymbol];
rcvBuffer = new float[2*2*OUTCHUNK*samplesPerSymbol];
sendBuffer = new float[2*2*INCHUNK*sps];
rcvBuffer = new float[2*2*OUTCHUNK*sps];
mOn = true;
@@ -202,8 +202,8 @@ void RadioInterface::driveReceiveRadio() {
// while there's enough data in receive buffer, form received
// GSM bursts and pass up to Transceiver
// Using the 157-156-156-156 symbols per timeslot format.
while (rcvSz > (symbolsPerSlot + (tN % 4 == 0))*samplesPerSymbol) {
signalVector rxVector((symbolsPerSlot + (tN % 4 == 0))*samplesPerSymbol);
while (rcvSz > (symbolsPerSlot + (tN % 4 == 0)) * sps) {
signalVector rxVector((symbolsPerSlot + (tN % 4 == 0)) * sps);
unRadioifyVector(rcvBuffer+readSz*2,rxVector);
GSM::Time tmpTime = rcvClock;
if (rcvClock.FN() >= 0) {
@@ -223,8 +223,8 @@ void RadioInterface::driveReceiveRadio() {
rcvClock.incTN();
//if (mReceiveFIFO.size() >= 16) mReceiveFIFO.wait(8);
//LOG(DEBUG) << "receiveFIFO: wrote radio vector at time: " << mClock.get() << ", new size: " << mReceiveFIFO.size() ;
readSz += (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;
rcvSz -= (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;
readSz += (symbolsPerSlot+(tN % 4 == 0)) * sps;
rcvSz -= (symbolsPerSlot+(tN % 4 == 0)) * sps;
tN = rcvClock.TN();
}

6
Transceiver52M/radioInterface.h
View File

@@ -50,7 +50,7 @@ protected:
RadioClock mClock; ///< the basestation clock!
int samplesPerSymbol; ///< samples per GSM symbol
int sps; ///< samples per GSM symbol
int receiveOffset; ///< offset b/w transmit and receive GSM timestamps, in timeslots
bool mOn; ///< indicates radio is on
@@ -92,10 +92,6 @@ public:
/** destructor */
~RadioInterface();
void setSamplesPerSymbol(int wSamplesPerSymbol) {if (!mOn) samplesPerSymbol = wSamplesPerSymbol;}
int getSamplesPerSymbol() { return samplesPerSymbol;}
/** check for underrun, resets underrun value */
bool isUnderrun();

98
Transceiver52M/sigProcLib.cpp
View File

@@ -214,22 +214,24 @@ void initTrigTables() {
}
}
void initGMSKRotationTables(int samplesPerSymbol) {
GMSKRotation = new signalVector(157*samplesPerSymbol);
GMSKReverseRotation = new signalVector(157*samplesPerSymbol);
void initGMSKRotationTables(int sps)
{
GMSKRotation = new signalVector(157 * sps);
GMSKReverseRotation = new signalVector(157 * sps);
signalVector::iterator rotPtr = GMSKRotation->begin();
signalVector::iterator revPtr = GMSKReverseRotation->begin();
float phase = 0.0;
while (rotPtr != GMSKRotation->end()) {
*rotPtr++ = expjLookup(phase);
*revPtr++ = expjLookup(-phase);
phase += M_PI_F/2.0F/(float) samplesPerSymbol;
phase += M_PI_F / 2.0F / (float) sps;
}
}
void sigProcLibSetup(int samplesPerSymbol) {
void sigProcLibSetup(int sps)
{
initTrigTables();
initGMSKRotationTables(samplesPerSymbol);
initGMSKRotationTables(sps);
}
void GMSKRotate(signalVector &x) {
@@ -435,20 +437,19 @@ signalVector* convolve(const signalVector *a,
}
signalVector* generateGSMPulse(int symbolLength,
int samplesPerSymbol)
signalVector* generateGSMPulse(int sps, int symbolLength)
{
int numSamples = samplesPerSymbol*symbolLength + 1;
int numSamples = sps * symbolLength + 1;
signalVector *x = new signalVector(numSamples);
signalVector::iterator xP = x->begin();
int centerPoint = (numSamples-1)/2;
for (int i = 0; i < numSamples; i++) {
float arg = (float) (i-centerPoint)/(float) samplesPerSymbol;
float arg = (float) (i - centerPoint) / (float) sps;
*xP++ = 0.96*exp(-1.1380*arg*arg-0.527*arg*arg*arg*arg); // GSM pulse approx.
}
float avgAbsval = sqrtf(vectorNorm2(*x)/samplesPerSymbol);
float avgAbsval = sqrtf(vectorNorm2(*x) / sps);
xP = x->begin();
for (int i = 0; i < numSamples; i++)
*xP++ /= avgAbsval;
@@ -564,12 +565,12 @@ bool vectorSlicer(signalVector *x)
signalVector *modulateBurst(const BitVector &wBurst,
const signalVector &gsmPulse,
int guardPeriodLength,
int samplesPerSymbol)
int sps)
{
//static complex staticBurst[157];
int burstSize = samplesPerSymbol*(wBurst.size()+guardPeriodLength);
int burstSize = sps * (wBurst.size() + guardPeriodLength);
//signalVector modBurst((complex *) staticBurst,0,burstSize);
signalVector modBurst(burstSize);// = new signalVector(burstSize);
modBurst.isRealOnly(true);
@@ -582,7 +583,7 @@ signalVector *modulateBurst(const BitVector &wBurst,
*modBurstItr = 2.0*(wBurst[0] & 0x01)-1.0;
signalVector::iterator prevVal = modBurstItr;
for (unsigned int i = 1; i < wBurst.size(); i++) {
modBurstItr += samplesPerSymbol;
modBurstItr += sps;
if (wBurst[i] & 0x01)
*modBurstItr = *prevVal * complex(0.0,1.0);
else
@@ -593,7 +594,7 @@ signalVector *modulateBurst(const BitVector &wBurst,
// if wBurst are the raw bits
for (unsigned int i = 0; i < wBurst.size(); i++) {
*modBurstItr = 2.0*(wBurst[i] & 0x01)-1.0;
modBurstItr += samplesPerSymbol;
modBurstItr += sps;
}
// shift up pi/2
@@ -835,7 +836,7 @@ void offsetVector(signalVector &x,
}
bool generateMidamble(signalVector &gsmPulse,
int samplesPerSymbol,
int sps,
int TSC)
{
@@ -854,11 +855,11 @@ bool generateMidamble(signalVector &gsmPulse,
signalVector *middleMidamble = modulateBurst(gTrainingSequence[TSC].segment(5,16),
emptyPulse,
0,
samplesPerSymbol);
sps);
signalVector *midamble = modulateBurst(gTrainingSequence[TSC],
gsmPulse,
0,
samplesPerSymbol);
sps);
if (midamble == NULL) return false;
if (middleMidamble == NULL) return false;
@@ -884,7 +885,7 @@ bool generateMidamble(signalVector &gsmPulse,
LOG(DEBUG) << "TOA: " << gMidambles[TSC]->TOA;
//gMidambles[TSC]->TOA -= 5*samplesPerSymbol;
//gMidambles[TSC]->TOA -= 5*sps;
delete autocorr;
delete midamble;
@@ -893,7 +894,7 @@ bool generateMidamble(signalVector &gsmPulse,
}
bool generateRACHSequence(signalVector &gsmPulse,
int samplesPerSymbol)
int sps)
{
if (gRACHSequence) {
@@ -904,7 +905,7 @@ bool generateRACHSequence(signalVector &gsmPulse,
signalVector *RACHSeq = modulateBurst(gRACHSynchSequence,
gsmPulse,
0,
samplesPerSymbol);
sps);
assert(RACHSeq);
@@ -926,7 +927,7 @@ bool generateRACHSequence(signalVector &gsmPulse,
bool detectRACHBurst(signalVector &rxBurst,
float detectThreshold,
int samplesPerSymbol,
int sps,
complex *amplitude,
float* TOA)
{
@@ -952,7 +953,7 @@ bool detectRACHBurst(signalVector &rxBurst,
LOG(DEBUG) << "RACH corr: " << correlatedRACH;
float numSamples = 0.0;
for (int i = 57*samplesPerSymbol; i <= 107*samplesPerSymbol;i++) {
for (int i = 57 * sps; i <= 107 * sps; i++) {
if (peakPtr+i >= correlatedRACH.end())
break;
valleyPower += (peakPtr+i)->norm2();
@@ -970,7 +971,7 @@ bool detectRACHBurst(signalVector &rxBurst,
LOG(DEBUG) << "RACH peakAmpl=" << peakAmpl << " RMS=" << RMS << " peakToMean=" << peakToMean;
*amplitude = peakAmpl/(gRACHSequence->gain);
*TOA = (*TOA) - gRACHSequence->TOA - 8*samplesPerSymbol;
*TOA = (*TOA) - gRACHSequence->TOA - 8 * sps;
LOG(DEBUG) << "RACH thresh: " << peakToMean;
@@ -1000,7 +1001,7 @@ bool energyDetect(signalVector &rxBurst,
bool analyzeTrafficBurst(signalVector &rxBurst,
unsigned TSC,
float detectThreshold,
int samplesPerSymbol,
int sps,
complex *amplitude,
float *TOA,
unsigned maxTOA,
@@ -1014,12 +1015,12 @@ bool analyzeTrafficBurst(signalVector &rxBurst,
assert(TOA);
assert(gMidambles[TSC]);
if (maxTOA < 3*samplesPerSymbol) maxTOA = 3*samplesPerSymbol;
if (maxTOA < 3*sps) maxTOA = 3*sps;
unsigned spanTOA = maxTOA;
if (spanTOA < 5*samplesPerSymbol) spanTOA = 5*samplesPerSymbol;
if (spanTOA < 5*sps) spanTOA = 5*sps;
unsigned startIx = 66*samplesPerSymbol-spanTOA;
unsigned endIx = (66+16)*samplesPerSymbol+spanTOA;
unsigned startIx = 66*sps-spanTOA;
unsigned endIx = (66+16)*sps+spanTOA;
unsigned windowLen = endIx - startIx;
unsigned corrLen = 2*maxTOA+1;
@@ -1046,7 +1047,7 @@ bool analyzeTrafficBurst(signalVector &rxBurst,
}
int numRms = 0;
for (int i = 2*samplesPerSymbol; i <= 5*samplesPerSymbol;i++) {
for (int i = 2*sps; i <= 5*sps;i++) {
if (peakPtr - i >= correlatedBurst.begin()) {
valleyPower += (peakPtr-i)->norm2();
numRms++;
@@ -1079,30 +1080,36 @@ bool analyzeTrafficBurst(signalVector &rxBurst,
LOG(DEBUG) << "autocorr: " << correlatedBurst;
if (requestChannel && (peakToMean > detectThreshold)) {
float TOAoffset = maxTOA; //gMidambles[TSC]->TOA+(66*samplesPerSymbol-startIx);
float TOAoffset = maxTOA;
delayVector(correlatedBurst,-(*TOA));
// midamble only allows estimation of a 6-tap channel
signalVector channelVector(6*samplesPerSymbol);
signalVector chanVector(6 * sps);
float maxEnergy = -1.0;
int maxI = -1;
for (int i = 0; i < 7; i++) {
if (TOAoffset+(i-5)*samplesPerSymbol + channelVector.size() > correlatedBurst.size()) continue;
if (TOAoffset+(i-5)*samplesPerSymbol < 0) continue;
correlatedBurst.segmentCopyTo(channelVector,(int) floor(TOAoffset+(i-5)*samplesPerSymbol),channelVector.size());
float energy = vectorNorm2(channelVector);
if (TOAoffset + (i-5) * sps + chanVector.size() > correlatedBurst.size())
continue;
if (TOAoffset + (i-5) * sps < 0)
continue;
correlatedBurst.segmentCopyTo(chanVector,
(int) floor(TOAoffset + (i - 5) * sps),
chanVector.size());
float energy = vectorNorm2(chanVector);
if (energy > 0.95*maxEnergy) {
maxI = i;
maxEnergy = energy;
}
}
*channelResponse = new signalVector(channelVector.size());
correlatedBurst.segmentCopyTo(**channelResponse,(int) floor(TOAoffset+(maxI-5)*samplesPerSymbol),(*channelResponse)->size());
scaleVector(**channelResponse,complex(1.0,0.0)/gMidambles[TSC]->gain);
*channelResponse = new signalVector(chanVector.size());
correlatedBurst.segmentCopyTo(**channelResponse,
(int) floor(TOAoffset + (maxI - 5) * sps),
(*channelResponse)->size());
scaleVector(**channelResponse, complex(1.0, 0.0) / gMidambles[TSC]->gain);
LOG(DEBUG) << "channelResponse: " << **channelResponse;
if (channelResponseOffset)
*channelResponseOffset = 5*samplesPerSymbol-maxI;
*channelResponseOffset = 5 * sps - maxI;
}
@@ -1129,7 +1136,7 @@ signalVector *decimateVector(signalVector &wVector,
SoftVector *demodulateBurst(signalVector &rxBurst,
const signalVector &gsmPulse,
int samplesPerSymbol,
int sps,
complex channel,
float TOA)
@@ -1144,8 +1151,8 @@ SoftVector *demodulateBurst(signalVector &rxBurst,
GMSKReverseRotate(*shapedBurst);
// run through slicer
if (samplesPerSymbol > 1) {
signalVector *decShapedBurst = decimateVector(*shapedBurst,samplesPerSymbol);
if (sps > 1) {
signalVector *decShapedBurst = decimateVector(*shapedBurst, sps);
shapedBurst = decShapedBurst;
}
@@ -1160,7 +1167,8 @@ SoftVector *demodulateBurst(signalVector &rxBurst,
for (; shapedItr < shapedBurst->end(); shapedItr++)
*burstItr++ = shapedItr->real();
if (samplesPerSymbol > 1) delete shapedBurst;
if (sps > 1)
delete shapedBurst;
return burstBits;
@@ -1454,7 +1462,7 @@ bool designDFE(signalVector &channelResponse,
// Assumes symbol-rate sampling!!!!
SoftVector *equalizeBurst(signalVector &rxBurst,
float TOA,
int samplesPerSymbol,
int sps,
signalVector &w, // feedforward filter
signalVector &b) // feedback filter
{

35
Transceiver52M/sigProcLib.h
View File

@@ -103,7 +103,7 @@ float vectorNorm2(const signalVector &x);
float vectorPower(const signalVector &x);
/** Setup the signal processing library */
void sigProcLibSetup(int samplesPerSymbol);
void sigProcLibSetup(int sps);
/** Destroy the signal processing library */
void sigProcLibDestroy(void);
@@ -124,12 +124,11 @@ signalVector* convolve(const signalVector *a,
/**
Generate the GSM pulse.
@param samplesPerSymbol The number of samples per GSM symbol.
@param sps The number of samples per GSM symbol.
@param symbolLength The size of the pulse.
@return The GSM pulse.
*/
signalVector* generateGSMPulse(int samplesPerSymbol,
int symbolLength);
signalVector* generateGSMPulse(int sps, int symbolLength);
/**
Frequency shift a vector.
@@ -168,7 +167,7 @@ bool vectorSlicer(signalVector *x);
signalVector *modulateBurst(const BitVector &wBurst,
const signalVector &gsmPulse,
int guardPeriodLength,
int samplesPerSymbol);
int sps);
/** Sinc function */
float sinc(float x);
@@ -229,21 +228,19 @@ void offsetVector(signalVector &x,
/**
Generate a modulated GSM midamble, stored within the library.
@param gsmPulse The GSM pulse used for modulation.
@param samplesPerSymbol The number of samples per GSM symbol.
@param sps The number of samples per GSM symbol.
@param TSC The training sequence [0..7]
@return Success.
*/
bool generateMidamble(signalVector &gsmPulse,
int samplesPerSymbol,
int TSC);
bool generateMidamble(signalVector &gsmPulse, int sps, int tsc);
/**
Generate a modulated RACH sequence, stored within the library.
@param gsmPulse The GSM pulse used for modulation.
@param samplesPerSymbol The number of samples per GSM symbol.
@param sps The number of samples per GSM symbol.
@return Success.
*/
bool generateRACHSequence(signalVector &gsmPulse,
int samplesPerSymbol);
int sps);
/**
Energy detector, checks to see if received burst energy is above a threshold.
@@ -262,14 +259,14 @@ bool energyDetect(signalVector &rxBurst,
RACH correlator/detector.
@param rxBurst The received GSM burst of interest.
@param detectThreshold The threshold that the received burst's post-correlator SNR is compared against to determine validity.
@param samplesPerSymbol The number of samples per GSM symbol.
@param sps The number of samples per GSM symbol.
@param amplitude The estimated amplitude of received RACH burst.
@param TOA The estimate time-of-arrival of received RACH burst.
@return True if burst SNR is larger that the detectThreshold value.
*/
bool detectRACHBurst(signalVector &rxBurst,
float detectThreshold,
int samplesPerSymbol,
int sps,
complex *amplitude,
float* TOA);
@@ -278,7 +275,7 @@ bool detectRACHBurst(signalVector &rxBurst,
@param rxBurst The received GSM burst of interest.
@param detectThreshold The threshold that the received burst's post-correlator SNR is compared against to determine validity.
@param samplesPerSymbol The number of samples per GSM symbol.
@param sps The number of samples per GSM symbol.
@param amplitude The estimated amplitude of received TSC burst.
@param TOA The estimate time-of-arrival of received TSC burst.
@param maxTOA The maximum expected time-of-arrival
@@ -290,7 +287,7 @@ bool detectRACHBurst(signalVector &rxBurst,
bool analyzeTrafficBurst(signalVector &rxBurst,
unsigned TSC,
float detectThreshold,
int samplesPerSymbol,
int sps,
complex *amplitude,
float *TOA,
unsigned maxTOA,
@@ -311,14 +308,14 @@ signalVector *decimateVector(signalVector &wVector,
Demodulates a received burst using a soft-slicer.
@param rxBurst The burst to be demodulated.
@param gsmPulse The GSM pulse.
@param samplesPerSymbol The number of samples per GSM symbol.
@param sps The number of samples per GSM symbol.
@param channel The amplitude estimate of the received burst.
@param TOA The time-of-arrival of the received burst.
@return The demodulated bit sequence.
*/
SoftVector *demodulateBurst(signalVector &rxBurst,
const signalVector &gsmPulse,
int samplesPerSymbol,
int sps,
complex channel,
float TOA);
@@ -375,14 +372,14 @@ bool designDFE(signalVector &channelResponse,
Equalize/demodulate a received burst via a decision-feedback equalizer.
@param rxBurst The received burst to be demodulated.
@param TOA The time-of-arrival of the received burst.
@param samplesPerSymbol The number of samples per GSM symbol.
@param sps The number of samples per GSM symbol.
@param w The feed forward filter of the DFE.
@param b The feedback filter of the DFE.
@return The demodulated bit sequence.
*/
SoftVector *equalizeBurst(signalVector &rxBurst,
float TOA,
int samplesPerSymbol,
int sps,
signalVector &w,
signalVector &b);