CN103596260B - The slotted synchronous method and system of multicarrier gsm system - Google Patents
The slotted synchronous method and system of multicarrier gsm system Download PDFInfo
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Abstract
The present invention relates to the slotted synchronous method and system of multicarrier gsm system.The method includes：GSM base station signals to multicarrier carry out searching carrier, obtain carrier information；According to the carrier information, Base-Band Processing is carried out to each carrier wave using software and radio technique；The baseband signal of each carrier wave is carried out into cross-correlation with local sequence；The correlation peak obtained according to the cross-correlation judges synchronizing channel and Synchronization Burst sequence in broadcast channel, the position output time solt lock-out pulse using Synchronization Burst sequence in GSM frame structure.The present invention realizes multicarrier GSM slot synchronization functions, improves flexibility and the scalability of system, can adapt to different base station occasions, realizes the slot synchronization of self adaptation, simple and practical.
Description
Technical field
The present invention relates to moving communicating field and signal transacting, and in particular to same to a kind of time slot of multicarrier gsm system
One step process, and a kind of slot synchronization system of multicarrier gsm system.
Background technology
Base station is the equipment of most power consumption in whole wireless network, and the power amplifier unit power consumption in base station is then base station power consumption
More than 70%, therefore power amplifier technology is improved, the efficiency for improving power amplifier is to reduce the important means of base station power consumption.And base station is in work
During load be dynamic change, the portfolio difference of busy and idle time is very big, such as GSM（Global System
For Mobile Communications global system for mobile communications）GSM.What gsm mobile communication system was used
It is time-division multiplex technology (TDMA), each basic frame includes 8 time slots, and multiple basic frames constitute a multi-frame, and user is carried out
Call and related control signal only take up one of time slot (TimeSlot), thus to some carrier wave some when
Between be not that 8 time slots all have signal in section, when telephone traffic is more, 8 time slots have signal, and few in telephone traffic
When, little time slot only therein has signal.If intelligently turning off power amplifier unit in the time slot without business datum, so
The consumption of power amplifier can be just saved, the power consumption of transmitter unit is reduced.And in current GSM repeaters, no matter equipment shape
State is busy or not busy, and whether each time slot has CU, and the power amplifier unit in equipment is all normally opened, and power amplifier is in a device
The energy of consumption is maximum, and this has resulted in the waste of the energy.But the premise for realizing timeslot shutdown is to realize that time slot is same
Step.Time slot power detection can be just carried out after in slot synchronization, so that judge whether current time slots have service signal, if synchronous
It is not accurate enough, call drop is will result in, so as to influence speech quality.And in the network optimization such as repeater edge device, due to lacking
The signaling information of weary base band data, it is not easy to realize GSM slot synchronizations, so as to realize that accurate time slot power detection and time slot are closed
It is disconnected.
The content of the invention
It is an object of the invention to overcome shortcomings and deficiencies of the prior art, there is provided the slot synchronization of multicarrier gsm system
Method and system, can realize the time slot precise synchronization of multicarrier GSM base station signals, solve the mistake that baseband signal frequency deviation is brought
Difference problem, for time slot power detection provide reference synchronization, it is often more important that for the timeslot shutdown of base station power amplification unit is provided
Synchronizing information.
Technical scheme is as follows：
A kind of slotted synchronous method of multicarrier gsm system, comprises the following steps：
GSM base station signals to multicarrier carry out searching carrier, obtain carrier information；
According to the carrier information, Base-Band Processing is carried out to each carrier wave using software and radio technique；
The baseband signal of each carrier wave is carried out into cross-correlation with local sequence；
The correlation peak obtained according to the cross-correlation judges synchronizing channel and Synchronization Burst sequence in broadcast channel
Row, the position output time solt lock-out pulse using Synchronization Burst sequence in GSM frame structure.
A kind of slot synchronization system of multicarrier gsm system, including：Searching carrier module, baseband processing module, cross-correlation
Module, slot synchronization module；
The searching carrier module is used to carry out the GSM base station signals of multicarrier searching carrier, obtains carrier information；
The baseband processing module is used for according to the carrier information, and each carrier wave is carried out using software and radio technique
Base-Band Processing；
The cross-correlation module is used to for the baseband signal of each carrier wave to carry out cross-correlation with local sequence；
The slot synchronization module is used for the synchronization that correlation peak is judged in broadcast channel obtained according to the cross-correlation
Channel and Synchronization Burst sequence, the position output time solt synchronization arteries and veins using Synchronization Burst sequence in GSM frame structure
Punching.
The present invention has the following advantages that and beneficial effect compared with prior art：
The present invention on the premise of base station signaling is lacked, by carrier track algorithm from motion tracking GSM carrier informations, according to
Carrier information locking broadcast channel BCH（Broadcast Channel broadcast channels）, using radiotechnics, solve due to
The problem that RF down coversions and the frequency deviation of Digital Down Convert are brought, at the same it is related using real number, Digital Signal Processing resource is reduced,
Support that different application scenarios more importantly realize multicarrier GSM slot synchronization functions, improve system flexibility and
Scalability, can adapt to different base station occasions, the slot synchronization of self adaptation be realized, than the slot synchronization based on signaling resolution
Algorithm is simpler, convenient and practical.
Brief description of the drawings
Fig. 1 is the slotted synchronous method schematic flow sheet in one embodiment of multicarrier gsm system of the present invention.
Fig. 2 is the schematic flow sheet of step S11 in Fig. 1 embodiments.
Fig. 3 is the schematic flow sheet of step S12 in Fig. 1 embodiments.
Fig. 4 is the correlated results of SDR digital quadrature demodulations in one embodiment of the invention.
Fig. 5 is the schematic flow sheet of step S13 in Fig. 1 embodiments.
Fig. 6 is the schematic flow sheet of step S14 in Fig. 1 embodiments.
Fig. 7 is the slot synchronization system structured flowchart in one embodiment of multicarrier gsm system of the present invention.
Fig. 8 is the structural representation of searching carrier module in Fig. 7 embodiments.
Fig. 9 is the structural representation of baseband processing module in Fig. 7 embodiments.
Figure 10 is the structural representation of cross-correlation module in Fig. 7 embodiments.
Figure 11 is the structural representation of slot synchronization module in Fig. 7 embodiments.
Specific embodiment
The present invention is described in further detail with reference to embodiment and accompanying drawing, but embodiments of the present invention are not limited to
This.
Embodiment one：
As shown in figure 1, for the flow of the slotted synchronous method of the multicarrier gsm system in the present embodiment of the invention is illustrated
Figure, comprises the following steps：
S11, the GSM base station signals to multicarrier carry out searching carrier, obtain carrier information；
S12, according to the carrier information, Base-Band Processing is carried out to each carrier wave using software and radio technique；
S13, the baseband signal of each carrier wave is carried out into cross-correlation with local sequence；
S14, the correlation peak obtained according to the cross-correlation judge synchronizing channel and synchronization burst arteries and veins in broadcast channel
Sequence is rushed, the position output time solt lock-out pulse using Synchronization Burst sequence in GSM frame structure.
The present invention on the premise of base station signaling is lacked, by carrier track algorithm from motion tracking GSM carrier informations, according to
Carrier information locking broadcast channel BCH（Broadcast Channel broadcast channels）.Using radiotechnics, solve due to
The problem that RF down coversions and the frequency deviation of Digital Down Convert are brought, at the same it is related using real number, Digital Signal Processing resource is reduced,
Support that different application scenarios more importantly realize multicarrier GSM slot synchronization functions, improve system flexibility and
Scalability, can adapt to different base station occasions, the slot synchronization of self adaptation be realized, than the slot synchronization based on signaling resolution
Algorithm is simpler, convenient and practical.
For apparent technical scheme, the slotted synchronous method of multicarrier gsm system of the present invention is described below
Technical scheme preferred embodiment.
In a preferred embodiment, for S11, as shown in Fig. 2 specifically, it may include following steps：
S111, IF bandpass sampling is carried out to intermediate-freuqncy signal, obtain digital intermediate frequency real signal；
S112, zero intermediate frequency treatment is carried out to the digital intermediate frequency real signal, obtain zero intermediate frequency baseband inphase component IBJust
Hand over component QB；
S113, to the zero intermediate frequency baseband inphase component IBWith quadrature component QBSearching carrier is carried out, carrier information is obtained；
Bandpass sampling can be carried out to intermediate-freuqncy signal using Nyquist band logical sampling thheorem in the present embodiment, obtain numeral
Intermediate frequency real signal SB, while to SBSignal carries out zero intermediate frequency treatment, obtains zero intermediate frequency baseband inphase component IBWith quadrature component QB；
Wherein, the zero intermediate frequency treatment includes first order numeral NCO successively（Numerical Controlled
Oscillator digital controlled oscillators）Treatment and low-pass filtering treatment；The SBSignal carry out successively the first order numeral NCO treatment and
Low-pass filtering treatment；The low-pass filtering treatment can be FIR（Finite Impulse Response finite impulse response (FIR)s）Filter
Ripple, IIR（Infinite Impulse Response IIRs）Filtering or the filtering process of other forms；
According to known GSM searching carriers algorithm to zero intermediate frequency baseband inphase component IBWith quadrature component QBCarry out carrier wave
Search, obtains carrier information, and searching carrier specifically refers to the correlation technique that can provide GSM carrier informations, will not be described here.
For S12, as shown in figure 3, specifically, it may include following steps：
S121, according to the carrier information on current channel number to the zero intermediate frequency baseband inphase component IBWith orthogonal point
Amount QBAfter carrying out single pass Digital Down Convert treatment, then carry out sampling rate conversion and obtain baseband signal I0And Q0；
The carrier information that can be obtained according to the searching carrier, to zero intermediate frequency baseband signal I on current channel numberBAnd QB
Carry out single pass Digital Down Convert（DDC, Digital Down Conversion）Treatment；
The single pass Digital Down Convert DDC treatment include second level numeral NCO treatment, filtering extraction process, shaping
Filtering process, the high speed sequence to being exported after DDC treatment carries out sampling rate conversion, according to actual conditions setting it is relative with GSM yards
OSR (the Over Sampling Ratio over-sampling rates of first speed integral multiple）Value, obtains the relatively low baseband signal I of speed0And Q0。
It is that PLD alleviates burden due to reducing processing speed, while when being conducive to the PLD to carry out
Divide multiplexing, greatly save the hardware resource of device.The present invention can apply such as FPGA, CPLD, DSP PLD,
Digit chip is conducive to realize.
Zero intermediate frequency baseband signal IBAnd QBPass sequentially through second level numeral NCO treatment, filtering extraction treatment, at shaping filter
Reason；The filtering extraction is processed as CIC（Cascaded Integrator Comb integrate dressing）Extraction, HB（HalfBand half
Band）Extract, FIR is extracted or the filtering extraction of other forms is processed；The shaping filter is processed as FIR filtering, IIR and filters or it
The filtering process of his form.Due to the signal processing technology using above-mentioned multi tate, relevant parameter can be carried out again according to software
Set, therefore the carrier number supported can be increased and decreased according to application scenario, the bandwidth of support is also dependent on different applied fields
Conjunction is set, and considerably increases flexibility and the scalability of system, simpler than the slot synchronization algorithm based on signaling resolution
It is single, convenient and practical.
S122, using software radio digital quadrature demodulation technology, to the baseband signal I0And Q0Carry out complex demodulation,
Obtain real number baseband signal；
The relatively low baseband signal I of the speed that is obtained to step S1210And Q0Complex demodulation is carried out, real number baseband signal is obtained
S0；The complex demodulation uses SDR digital quadrature demodulation technologies, and its principle is as follows：
For modulated signal by intermediate frequency band logical ADC（Analog Digital Conversion analog-to-digital conversions）Sampling with
Afterwards, its mathematic(al) representation can be expressed as
S (n)=a (n) cos (ωcn+ψ(n))
=IBcos(ωcn)-QBsin(ωcn) （Formula 1）
S (n) in formula 1 is the digital medium-frequency signal after ADC samplings, component I in the same directionB, quadrature component QBTo need to carry out
The baseband signal of parsing.
According to carrier information to signal IBAnd QBExtract and filtering process obtains baseband signal I0And Q0, and I0And Q0Just
It is the baseband signal on current channel number.
According to complex orthogonal signal I0And Q0Modulated signal can be parsed, is used for the broadcast channel BCH of GSM
It is Gaussian minimum frequency-shift GMSK（Gaussian Minimum Shift Keying Gaussian minimum frequency-shifts）Modulation, is that phase is entered
Row integration, in order to obtain raw information, it is necessary to carry out differential, i.e., carries out differential, i.e., to ψ (n)
（Formula 2）
S in formula 20It is unmodulated symbol signal, the I0(n) and Q0N () is current sampling point, I0And Q (n-1)0
(n-1) it is upper a sampled point.
Mathematic(al) manipulation is carried out to it now,Launched according to mathematical formulae derivative, so to formula（2）Just
Have：
（Formula 3）
The derivative of discrete series is exactly difference, and for the GSM signals of the GMSK modulation of single carrier, signal is Heng Bao
Network, its amplitude is constant, i.e. I2 0(n)+Q0 2N () is constant.If I2 0(n)+Q0 2(n)=1, so having：
S0=ψ (n) '=XI(n-1)XQ(n)-XI(n)XQ(n-1) （Formula 4）
By formula 1, formula 2, formula 3 mathematic(al) manipulation, show that formula 4 is real sequence, i.e. a real number baseband signal
S0.Due to using above-mentioned SDR digital quadrature demodulations technology, RF is solved（Radio Frequency）Down coversion and the lower change of numeral
The frequency error that causes of frequency causes that correlation is poor, false synchronization problem.It is simultaneously related using real number, greatly reduce local sequence
Storage, saved the hardware resource of device.
It is as shown in Figure 4 the correlated results of SDR digital quadrature demodulations, due to by sampling rate conversion, in the present embodiment
S0Data transfer rate be 4 times of GSM spreading rates, be not limited only to 4 times in actual application.
For step S13, as shown in figure 5, specifically, it may include following steps：
S131, the training sequence to Synchronization Burst sequence in GSM frame form in gsm mobile communication system carry out interpolation
Produce local sequence；
S132, by the local sequence and the real number base band data carry out it is related it is cumulative draw correlation, then to described
Correlation carries out modulus；
Can be according to the training sequence S of Synchronization Burst sequence in GSM frame form in gsm mobile communication systemTInterpolation is produced
The local sequence S of lifeL；Due to using SDR quadrature demodulation technologies, local sequence SLMolding filtration is required no, Direct interpolation 4 enters again
Row is related；
Because the autocorrelation of the Synchronization Burst sequence of gsm mobile communication system is very strong, by local sequence SLWith reality
Number base band data S0Correlation is carried out according to formula 5 to add up, draw correlation Rx, then to RxModulus obtains R0。
（Formula 5）
For S14, as shown in fig. 6, specifically, it may include following steps：
S141, according to the baseband signal I0And Q0The signal power of current channel number is calculated, according to the signal power
Size adaptation sets threshold value；
S142, the correlation is compared with the threshold value；If the correlation is more than the thresholding threshold
Value, then it is GSM broadcast channel BCH to adjudicate present channel, while the current burst of judgement is Synchronization Burst sequence；
S143, when adjudicate this secondary burst be the Synchronization Burst sequence when, using the Synchronization Burst sequence
Position in GSM frame structure is to the baseband signal I0And Q0Enter line delay, output time solt lock-out pulse；
Can be according to baseband signal I0And Q0Calculate the signal power P of current channel number0, according to P0Size adaptation setting
Threshold value G0；Threshold value G0Store in a thresholding look-up table, P0As the input of look-up table, according to P0Size energy
Adaptive setting threshold value G0；
By the real number baseband signal R0With G0It is compared；If R0More than G0Then judgement present channel is GSM broadcast letters
Road BCH, while the current burst of judgement is Synchronization Burst sequence；
When it is Synchronization Burst sequence to adjudicate this secondary burst, then using Synchronization Burst sequence in GSM frame structure
In position to the baseband signal I0And Q0Enter line delay, output time solt lock-out pulse.
According to the slot synchronization pulse that above-mentioned slotted synchronous method is exported, for timeslot shutdown provides accurate synchronous letter
Breath, can according to the time slot power of slot synchronization pulse detection GSM base station systems, so as to judge whether this time slot has CU,
For no user timeslot shutdown power amplifier unit provides key parameter, therefore the consumption of power amplifier is greatlyd save, reduce transmitting single
The power consumption of unit, reaches the purpose of green energy resource.The power of GSM signals each time slots is accurately calculated by formula 6, it is real
Existing accurate detection time slot power PT：
（Formula 6）
M in formula 6 counts to calculate signal power point.
Accordingly, below in conjunction with the accompanying drawings with specific embodiment to the skill of multicarrier gsm system slot synchronization system of the present invention
Art scheme is described in detail.
Embodiment 2：
As shown in fig. 7, be the structural representation of the slot synchronization system of multicarrier gsm system of the present invention, including：
Searching carrier module 21, baseband processing module 22, cross-correlation module 23, slot synchronization module 24；
The searching carrier module 21 is used to carry out the GSM base station signals of multicarrier searching carrier, obtains carrier information；
The baseband processing module 22 is used for according to the carrier information, and each carrier wave is entered using software and radio technique
Row Base-Band Processing；
The cross-correlation module 23 is used to for the baseband signal of each carrier wave to carry out cross-correlation with local sequence；
The slot synchronization module 24 is used for the correlation peak that is obtained according to the cross-correlation and judges same in broadcast channel
Step channel and Synchronization Burst sequence, the position output time solt synchronization using Synchronization Burst sequence in GSM frame structure
Pulse.
A preferred embodiment of the slot synchronization system of multicarrier gsm system of the present invention is described below.
It is respectively that searching carrier module 21, baseband processing module 22, cross-correlation module 23 and time slot are same as shown in Fig. 8 ~ 11
Walk the structured flowchart of module 24.
Searching carrier module 21 includes sampling unit 211, zero intermediate frequency processing unit 212, search unit 213；
The sampling unit 211 is used to carry out IF bandpass sampling to intermediate-freuqncy signal, obtains digital intermediate frequency real signal；Can adopt
IF bandpass sampling is carried out to intermediate-freuqncy signal with Nyquist band logical sampling thheorem, digital intermediate frequency real signal S is obtainedB；
The zero intermediate frequency processing unit 212 is used to carry out zero intermediate frequency treatment to the digital intermediate frequency real signal, obtains in zero
Frequency baseband inphase component IBWith quadrature component QB；
To the SBSignal carries out zero intermediate frequency treatment, obtains zero intermediate frequency baseband inphase component IBWith quadrature component QB；Described zero
IF processing unit 212 also includes that first order numeral NCO processes subelement 2121 and low-pass filtering treatment subelement 2122；It is described
SBSignal passes sequentially through the first order numeral NCO treatment subelement 2121 and low-pass filtering treatment subelement 2122；The low pass filtered
Ripple treatment subelement 2122 can be the filtering process of FIR filtering, IIR filtering or other forms；
The search unit 213 is used for the zero intermediate frequency baseband inphase component IBWith quadrature component QBCarry out searching carrier,
Obtain carrier information；
Wherein, searching carrier specifically refers to the correlation technique that can provide GSM carrier informations, will not be described here.
The baseband processing module 22 includes：Digital Down Convert processing unit 221 and demodulating unit 222；
The Digital Down Convert processing unit 221 be used for according to the carrier information on current channel number to described zero in
Frequency baseband inphase component IBWith quadrature component QBCarry out single pass Digital Down Convert（That is DDC）After treatment, then carry out sample rate change
Get baseband signal I in return0And Q0；
The Digital Down Convert processing unit 221 includes second level numeral NCO treatment subelement 2211, filtering extraction treatment
Subelement 2212, shaping filter processes subelement 2213, carries out sampling rate conversion and obtains the relatively low baseband signal I of speed0And Q0。
It is that PLD alleviates burden due to reducing processing speed, while when being conducive to the PLD to carry out
Divide multiplexing, greatly save the hardware resource of device.The present invention can apply such as FPGA, CPLD, DSP PLD,
Digit chip is conducive to realize.
Zero intermediate frequency baseband signal IBAnd QBPass sequentially through second level numeral NCO treatment subelement 2211, filtering extraction treatment
Unit 2212, shaping filter processes subelement 2213；The filtering extraction treatment subelement 2212 can be extracted for CIC, HB half
Extracted with extraction, FIR or the filtering extraction of other forms is processed；The shaping filter is processed as FIR filtering, IIR and filters or it
The filtering process of his form.Due to the signal processing technology using above-mentioned multi tate, relevant parameter can be carried out again according to software
Set, therefore the carrier number supported can be increased and decreased according to application scenario, the bandwidth of support is also dependent on different applied fields
Conjunction is set, and considerably increases flexibility and the scalability of system, simpler than the slot synchronization algorithm based on signaling resolution
It is single, convenient and practical.
The demodulating unit 222 is used for using software radio digital quadrature demodulation technology to the baseband signal I0And Q0
Complex demodulation is carried out, real number baseband signal S is obtained0.Due to using above-mentioned SDR digital quadrature demodulations technology, RF is solved
（Radio Frequency）The frequency error that down coversion and Digital Down Convert cause causes that correlation is poor, false synchronization problem.Together
Shi Caiyong real numbers are related, greatly reduce the storage of local sequence, saved the hardware resource of device.
The cross-correlation module 23 includes interpolation unit 231 and related summing elements 232；
The interpolation unit 231 is used for the training sequence to synchronization burst SB in GSM frame form in gsm mobile communication system
STCarry out interpolation and produce local sequence SL；
The related summing elements 232 are used for the local sequence SLWith real number base band data S0Carry out correlation cumulative, obtain
Go out correlation Rx, then to RxAs a result modulus obtains correlation R0。
The slot synchronization module 24 includes setup unit 241, decision unit 242, output unit 243；
The setup unit 241 is used for according to the baseband signal I0And Q0Calculate the signal power P of current channel number0, root
According to P0Size adaptation set correlator threshold value G0；
The decision unit 242 is used for the related accumulation result output R0With the G0It is compared；If R0It is more than
G0Then judgement present channel is GSM broadcast channel BCH, while the current burst of judgement is Synchronization Burst sequence；
The output unit 243 is used for when it is the Synchronization Burst sequence to adjudicate this secondary burst, using described same
Position of the step burst sequence in GSM frame structure is to baseband signal I0And Q0Enter line delay, output time solt lock-out pulse I0With
Q0。
According to the slot synchronization pulse that above-mentioned slot synchronization system is exported, for timeslot shutdown provides accurate synchronous letter
Breath, can according to the time slot power of slot synchronization pulse detection GSM base station systems, so as to judge whether this time slot has CU,
For no user timeslot shutdown power amplifier unit provides key parameter, therefore the consumption of power amplifier is greatlyd save, reduce transmitting single
The power consumption of unit, reaches the purpose of green energy resource.
The present invention on the premise of base station signaling is lacked, by carrier track algorithm from motion tracking GSM carrier informations, according to
Carrier information locking broadcast channel BCH.Using SDR digital quadrature demodulation technique algorithms, solve due to RF down coversions and numeral
The problem that the frequency deviation of down coversion is brought, at the same it is related using real number, reduce Digital Signal Processing resource；More importantly pass through
Using SDR（Software Defined Radio software radios）The signal processing technology of multi tate, the carrier number of support can
Increased and decreased according to application scenario, the bandwidth of support is set also dependent on different application scenarios, considerably increase and be
The flexibility of system and scalability, realize multicarrier GSM slot synchronization functions, improve the flexibility of system and expansible
Property, different base station occasions are can adapt to, the slot synchronization of self adaptation is realized, than the slot synchronization algorithm based on signaling resolution more
Simply, it is convenient and practical.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Shield scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. the slotted synchronous method of multicarrier gsm system, it is characterised in that comprise the following steps：
GSM base station signals to multicarrier carry out searching carrier, obtain carrier information；
According to the carrier information, Base-Band Processing is carried out to each carrier wave using software and radio technique；
The baseband signal of each carrier wave is carried out into cross-correlation with local sequence；
The correlation peak obtained according to the cross-correlation judges synchronizing channel and Synchronization Burst sequence in broadcast channel, profit
Position output time solt lock-out pulse with the Synchronization Burst sequence in GSM frame structure；
The step of GSM base station signals to multicarrier carry out searching carrier, acquisition carrier information specifically includes：
IF bandpass sampling is carried out to intermediate-freuqncy signal, digital intermediate frequency real signal is obtained；
Zero intermediate frequency treatment is carried out to the digital intermediate frequency real signal, zero intermediate frequency baseband inphase component I is obtainedBWith quadrature component QB；Institute
State zero intermediate frequency treatment includes first order numeral NCO treatment and low-pass filtering treatment successively；
To the zero intermediate frequency baseband inphase component IBWith quadrature component QBSearching carrier is carried out, carrier information is obtained.
2. the slotted synchronous method of multicarrier gsm system according to claim 1, it is characterised in that described in the basis
Carrier information, specifically includes the step of carry out Base-Band Processing to each carrier wave using software and radio technique：
According to the carrier information on current channel number to the zero intermediate frequency baseband inphase component IBWith quadrature component QBCarry out list
After the Digital Down Convert treatment of passage, then carry out sampling rate conversion and obtain baseband signal I0And Q0；
Using software radio digital quadrature demodulation technology, to the baseband signal I0And Q0Complex demodulation is carried out, real number base is obtained
Band signal.
3. the slotted synchronous method of multicarrier gsm system according to claim 2, it is characterised in that it is described will be described every
The step of baseband signal of individual carrier wave carries out cross-correlation with local sequence specifically includes：
Training sequence to Synchronization Burst sequence in GSM frame form in gsm mobile communication system carries out interpolation generation locally
Sequence；
The local sequence and the real number base band data are carried out into related adding up and draws correlation, then the correlation is carried out
Modulus.
4. the slotted synchronous method of multicarrier gsm system according to claim 3, it is characterised in that described in the basis
The correlation peak that cross-correlation is obtained judges synchronizing channel and Synchronization Burst sequence in broadcast channel, using synchronization burst arteries and veins
The step of rushing position output time solt lock-out pulse of the sequence in GSM frame structure specifically includes：
According to the baseband signal I0And Q0The signal power of current channel number is calculated, the size according to the signal power is adaptive
Threshold value should be set；
The correlation is compared with the threshold value；If the correlation is more than the threshold value, adjudicate
Present channel is GSM broadcast channel BCH, while the current burst of judgement is Synchronization Burst sequence；
When it is the Synchronization Burst sequence to adjudicate this secondary burst, using the Synchronization Burst sequence in GSM frame knot
Position in structure is to the baseband signal I0And Q0Enter line delay, output time solt lock-out pulse.
5. the slot synchronization system of multicarrier gsm system, it is characterised in that including：Searching carrier module, baseband processing module,
Cross-correlation module, slot synchronization module；
The searching carrier module is used to carry out the GSM base station signals of multicarrier searching carrier, obtains carrier information；
The baseband processing module is used for according to the carrier information, and base band is carried out to each carrier wave using software and radio technique
Treatment；
The cross-correlation module is used to for the baseband signal of each carrier wave to carry out cross-correlation with local sequence；
The slot synchronization module is used for the synchronizing channel that correlation peak is judged in broadcast channel obtained according to the cross-correlation
With Synchronization Burst sequence, the position output time solt lock-out pulse using Synchronization Burst sequence in GSM frame structure；
The searching carrier module includes sampling unit, zero intermediate frequency processing unit, search unit；
The sampling unit is used to carry out IF bandpass sampling to intermediate-freuqncy signal, obtains digital intermediate frequency real signal；
The zero intermediate frequency processing unit is used to carry out zero intermediate frequency treatment to the digital intermediate frequency real signal, obtains zero intermediate frequency base band same
Phase component IBWith quadrature component QB；The zero intermediate frequency treatment includes first order numeral NCO treatment and low-pass filtering treatment successively；
The search unit is used for the zero intermediate frequency baseband inphase component IBWith quadrature component QBSearching carrier is carried out, is obtained and is carried
Ripple information.
6. the slot synchronization system of multicarrier gsm system according to claim 5, it is characterised in that the Base-Band Processing
Module includes：Digital Down Convert processing unit and demodulating unit；
The Digital Down Convert processing unit be used for according to the carrier information on current channel number to the zero intermediate frequency base band
In-phase component IBWith quadrature component QBAfter carrying out single pass Digital Down Convert treatment, then carry out sampling rate conversion obtain base band letter
Number I0And Q0；
The demodulating unit is used for using software radio digital quadrature demodulation technology to the baseband signal I0And Q0Carry out plural number
Demodulation, obtains real number baseband signal.
7. the slot synchronization system of multicarrier gsm system according to claim 6, it is characterised in that the cross-correlation mould
Block includes interpolation unit and related summing elements；
The interpolation unit is used for the training sequence to Synchronization Burst sequence in GSM frame form in gsm mobile communication system
Carry out interpolation and produce local sequence；
The local sequence and real number base band data are carried out related adding up and draw correlation by the related summing elements, then to institute
Stating correlation carries out modulus.
8. the slot synchronization system of multicarrier gsm system according to claim 7, it is characterised in that the slot synchronization
Module includes setup unit, decision unit, output unit；
The setup unit is used for according to the baseband signal I0And Q0The signal power of current channel number is calculated, according to the letter
The size adaptation setting threshold value of number power；
The decision unit is used to be compared the threshold value；If the correlation is more than the threshold value,
Judgement present channel is GSM broadcast channel BCH, while the current burst of judgement is Synchronization Burst sequence；
The output unit is used for when it is the Synchronization Burst sequence to adjudicate this secondary burst, using the synchronization burst arteries and veins
Position of the sequence in GSM frame structure is rushed to the baseband signal I0And Q0Enter line delay, output time solt lock-out pulse.
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| CN1313685A (en) * | 2000-03-14 | 2001-09-19 | 日本电气株式会社 | Method for obtaining time-gap timing in direct sequence expanded spectrum communication receiver |
| EP1191689A2 (en) * | 2000-09-20 | 2002-03-27 | Nec Corporation | Method and apparatus for adjusting reference frequency |
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| CN102123431B (en) * | 2011-03-25 | 2014-08-13 | 京信通信系统（广州）有限公司 | Time slot synchronizing and time slot power detecting methods and systems applied to global system for mobile communication (GSM) |
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| CN1313685A (en) * | 2000-03-14 | 2001-09-19 | 日本电气株式会社 | Method for obtaining time-gap timing in direct sequence expanded spectrum communication receiver |
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