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3e24f791dd
Provides improved transmit phase error performance below 1 degree RMS on certain devices. Requires use of 4 samples-per-symbol. Signed-off-by: Thomas Tsou <tom@tsou.cc>
157 lines
4.4 KiB
C++
157 lines
4.4 KiB
C++
/*
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* Copyright 2008, 2012 Free Software Foundation, Inc.
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*
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* This software is distributed under multiple licenses; see the COPYING file in the main directory for licensing information for this specific distribuion.
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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 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.
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*/
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#ifndef _RADIOINTEFACE_H_
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#define _RADIOINTEFACE_H_
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#include "sigProcLib.h"
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#include "GSMCommon.h"
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#include "LinkedLists.h"
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#include "radioDevice.h"
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#include "radioVector.h"
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#include "radioClock.h"
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/** samples per GSM symbol */
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#define SAMPSPERSYM 4
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#define INCHUNK (625)
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#define OUTCHUNK (625)
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#define CHAN_MAX 2
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static const unsigned gSlotLen = 148; ///< number of symbols per slot, not counting guard periods
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/** class to interface the transceiver with the USRP */
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class RadioInterface {
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protected:
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int mChanM; ///< channelizer width
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Thread *mAlignRadioServiceLoopThread; ///< thread that synchronizes transmit and receive sections
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VectorFIFO mReceiveFIFO[CHAN_MAX]; ///< FIFO that holds receive bursts
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RadioDevice *mRadio; ///< the USRP object
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float *sendBuffer[CHAN_MAX];
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unsigned sendCursor;
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float *rcvBuffer[CHAN_MAX];
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unsigned rcvCursor;
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bool underrun; ///< indicates writes to USRP are too slow
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bool overrun; ///< indicates reads from USRP are too slow
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TIMESTAMP writeTimestamp; ///< sample timestamp of next packet written to USRP
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TIMESTAMP readTimestamp; ///< sample timestamp of next packet read from USRP
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RadioClock mClock; ///< the basestation clock!
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int sps; ///< samples per GSM symbol
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int receiveOffset; ///< offset b/w transmit and receive GSM timestamps, in timeslots
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bool mOn; ///< indicates radio is on
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double powerScaling;
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bool loadTest;
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int mNumARFCNs;
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signalVector *finalVec, *finalVec9;
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private:
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/** initialize I/O internals */
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bool init();
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/** format samples to USRP */
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int radioifyVector(signalVector &wVector,
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float *floatVector,
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float scale,
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bool zero);
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/** format samples from USRP */
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int unRadioifyVector(float *floatVector, int offset, signalVector &wVector);
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/** push GSM bursts into the transmit buffer */
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virtual void pushBuffer(void);
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/** pull GSM bursts from the receive buffer */
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virtual void pullBuffer(void);
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/** load receive vectors into FIFO's */
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void loadVectors(unsigned tN, int samplesPerBurst, int index, GSM::Time rxClock);
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public:
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/** start the interface */
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bool start();
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bool stop();
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bool started() { return mOn; };
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/** shutdown interface */
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void close();
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/** constructor */
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RadioInterface(RadioDevice* wRadio,
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int wChanM = 1,
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int wSPS = SAMPSPERSYM,
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int receiveOffset = 3,
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GSM::Time wStartTime = GSM::Time(0, 0));
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/** destructor */
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~RadioInterface();
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void setSamplesPerSymbol(int sps) {if (!mOn) this->sps = sps;}
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int getSamplesPerSymbol() { return sps;}
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/** return the receive FIFO */
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VectorFIFO* receiveFIFO(int num) { return &mReceiveFIFO[num];}
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/** return the basestation clock */
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RadioClock* getClock(void) { return &mClock;};
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/** set transmit frequency */
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bool tuneTx(double freq, int chan = 0);
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/** set receive frequency */
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bool tuneRx(double freq, int chan = 0);
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/** set receive gain */
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double setRxGain(double dB, int chan = 0);
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/** get receive gain */
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double getRxGain(int chan = 0);
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/** drive transmission of GSM bursts */
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void driveTransmitRadio(signalVector **radioBurst, bool *zeroBurst);
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/** drive reception of GSM bursts */
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void driveReceiveRadio();
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void setPowerAttenuation(double atten, int chan = 0);
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/** returns the full-scale transmit amplitude **/
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double fullScaleInputValue();
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/** returns the full-scale receive amplitude **/
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double fullScaleOutputValue();
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/** set thread priority on current thread */
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void setPriority() { mRadio->setPriority(); }
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/** get transport window type of attached device */
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enum RadioDevice::TxWindowType getWindowType() { return mRadio->getWindowType(); }
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};
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#endif /* _RADIOINTEFACE_H_ */
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