CN101588336A - Method, system and device for realizing symbol synchronization - Google Patents
Method, system and device for realizing symbol synchronization Download PDFInfo
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- CN101588336A CN101588336A CNA2008100979331A CN200810097933A CN101588336A CN 101588336 A CN101588336 A CN 101588336A CN A2008100979331 A CNA2008100979331 A CN A2008100979331A CN 200810097933 A CN200810097933 A CN 200810097933A CN 101588336 A CN101588336 A CN 101588336A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
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- Computer Networks & Wireless Communication (AREA)
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The embodiment of the invention discloses a method, a system and a device for realizing symbol synchronization. The method for realizing symbol synchronization comprises the following steps: acquiring an initial position of a symbol period of a crosstalk signal; synchronizing an initial position of a symbol period of a pre-sending signal with the initial position of the symbol period of the crosstalk signal; and sending the signal according to the synchronized initial position of the symbol period. The embodiment of the invention realizes symbol synchronization among circuits, solves the problem of the symbol synchronization of a sending signal and ensures the symbol orthogonality in the signal sending process.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method, system and device of realizing sign synchronization.
Background technology
Digital Subscriber Line (Digital Subscriber Line, DSL) technology is a kind of twisted pair telephone that passes through, be unshielded twisted pair (Unshielded Twist Pair, UTP) carry out the high speed transmission technology of transfer of data, comprise ADSL (Asymmetric Digital Subscriber Line) (Asymmetrical Digital Subscriber Line, ADSL), Very-high-speed Digital Subscriber Line (Very-high-bit-rate Digital Subscriber Line, VDSL), based on integrated services digital network (Integrated Services Digital Network, ISDN) number of users word line (ISDNDigital Subscriber Line, IDSL) and single-line high speed digital subscriber line (Single-pairHigh-bit-rate Digital Subscriber Line, SHDSL) etc.
In various digital user line technologies (xDSL), except the DSL of baseband transmission such as IDSL and SHDSL, adopt the DSL of passband transmission to utilize frequency multiplexing technique to make DSL and Plain Old Telephone Service (Plain Old Telephone Service, POTS) coexist as with on a pair of twisted-pair feeder, wherein DSL occupies high band, POTS takies the following baseband portion of 4KHz, POTS signal and DSL signal by separate/integrator (Splitter) separates or merges.The xDSL of passband transmission adopts the Discrete multi-tone modulation, and (Discrete Multi-Tone Modulation, DMT) technology is carried out modulation and demodulation.The system that provides multichannel DSL to insert is called the DSL couple in multiplexer, and (DSL Access Multiplexer, DSLAM), its system's annexation schematic diagram as shown in Figure 1.DSLAM120 comprises user's Transmit-Receive Unit 121 and separates/integrator 122, at up direction, user's Transmit-Receive Unit 121 receives and carries out processing and amplifying from the DSL signal of computer 110 and to the signal of being received, the DSL signal after handling is sent to separation/integrator 122; Separation/integrator 122 will carry out integration processing from the DSL signal of user's Transmit-Receive Unit 121 and the POTS signal of telephone terminal 130; Signal after the integration is received by the separation/integrator among the DSLAM 150 of opposite end 151 by the transmission of the UTP 140 of multichannel; Separation/integrator 151 separates the signal that is received, POTS signal wherein is sent to public switched telephone network (Public SwitchedTelephone Network, PSTN) 160, DSL signal wherein is sent to the Transmit-Receive Unit 152 of DSLAM150, Transmit-Receive Unit 152 carries out the signal of being received being sent to network management system (Network Management System, NMS) 170 after the processing and amplifying again.At the down direction of signal, then signal is according to transmitting with above-mentioned opposite order.
XDSL technology physics layer uses Orthodoxy Frequency Division Multiplex (Orthogonal Frequency DividedMultiple, OFDM) technology, in the symbol time range of (another kind of saying is called frame), send one group of mutually orthogonal subcarrier and carry bit (bit) information.Transceiver need pass through symbol timing synchronization method, seeks the symbol original position in the received signal, and receiving symbol is carried out demodulation.
The raising of the frequency band that uses along with the xDSL technology, crosstalk (crosstalk) especially the cross-interference issue of high band show to such an extent that become increasingly conspicuous.Because xDSL up-downgoing channel adopts frequency division multiplexing, near-end cross (NEXT) does not produce too big harm to the performance of system; But far-end cross talk (FEXT) can have a strong impact on the transmission performance of circuit.When there being the multichannel user all to require to open xDSL when professional in a bundle cable, can some line speeds be low because far-end cross talk (FEXT) makes, unstable properties even can not open etc., finally cause the line activation rate of DSLAM lower.
(Dynamic Spectral Management, DSM) technology make each bar circuit reach the result of an optimization from power aspect and signal aspect to have occurred Dynamic Spectrum Management in the recent period.The DSM of signal aspect mainly comprise multiple-input, multiple-output (Multi-Input and Multi-Output, MIMO), Vectored DSL (vectored DSL) etc.Vectored DSL technology and MIMO technology have many something in commons.The appearance of MIMO technology has solved the problem that each bar circuit is influenced by far-end cross talk, and the influence of getting on and producing except crosstalking from principle, and performance is optimized more.From present digital user line technology, MIMO is the digital user line technology of best performance.On modulation system, the MIMO technology also is to use popular OFDM at present, and is as described below relevant for the OFDM modulation technique:
The main thought of OFDM is that whole transmission band is divided into the narrow sub-band of many frequencies.Each sub-band is used for carrying certain bit number.As shown in Figure 2, because the band width of each sub-band is narrow, can be similar to so and thinks that the transfer function of channel in this frequency band is a constant.Approach undistorted transmission and be convenient to the receiving terminal processing.On the other hand, because the complete quadrature of each subcarrier can not make a difference between each subcarrier.
The crosstalk counteracting of the optimization of DSM technology and MIMO technology all is based on these characteristics of orthogonality and puts forward.In normal circumstances, the receiving terminal of each xDSL modem is used as other modem as noise to its interference, and then k tone of nth user goes up accessible data rate (b
k n) available shannon capacity formula calculating:
H wherein
k N, nRepresent the transfer function of n bar circuit on k subcarrier.h
k N, mRepresent m bar circuit crossfire function to n bar circuit on k subcarrier.σ
k nRepresent the noise power of n bar circuit on k subcarrier.s
k nRepresent the transmitted power of n bar circuit on k subcarrier.
The inventor finds that there is following shortcoming in prior art:
By the computing formula of top data rate as can be seen the rate calculations formula of whole DSM all be based on each subcarrier, this mainly is because the orthogonality of subcarrier.If the ruined words of the orthogonality of each subcarrier.The algorithm of all DSM all can change, and above-mentioned cited algorithm (comprising the crosstalk counteracting of the optimization of DSM technology and MIMO, Vectored DSL technology etc.) all can not be with in this case.
When the nonsynchronous words of the symbol of each bar circuit, will destroy this orthogonality.Be described as follows:
When the 1st circuit is subjected to the interference of the 2nd circuit, as shown in Figure 3, the 2nd circuit is asynchronous with the 1st line code.When the 1st circuit carries out the OFDM demodulation, will handle the part signal of frame 1 and frame 2 in the 2nd circuit.Be equivalent on the 2nd circuit, add a window 2 and window 3 respectively respectively.Obviously, window 2 and window 3 be all than normal ofdm signal window short (shown in window 1), and the spectrum width different (as Fig. 3) of window 1 and 3 generations of window 2 windows has so so just been destroyed the orthogonality of frequency.That is to say that the signal between different frequency also can interfere with each other.
Summary of the invention
Embodiments of the invention propose a kind of method that realizes sign synchronization, and guaranteeing the frame synchronization of each bar circuit, thereby the situation of avoiding destroying orthogonality takes place.
For achieving the above object, the embodiment of the invention proposes a kind of method that realizes sign synchronization on the one hand, comprising:
Obtain the symbol period original position of crosstalk signal;
With the symbol period original position of pre-sent signal is the symbol period original position of described crosstalk signal synchronously;
Send signal according to the symbol period original position synchronously.
The embodiment of the invention also proposes a kind of communicator on the one hand, comprising:
First acquisition module is used to obtain the symbol period original position of crosstalk signal;
Synchronization module is used for the symbol period original position with the synchronous crosstalk signal that obtains for described first acquisition module of symbol period original position of pre-sent signal;
Sending module is used for sending signal according to the symbol period original position of the signal of synchronization module after synchronously.
The embodiment of the invention also proposes a kind of synchronous centre manager on the one hand, comprising:
Choose module, be used to choose transceiver and send synchronous pilot signal, and issue the synchronous pilot signal request that sends to the described transceiver of having chosen;
Obtain the Information Statistics module, be used to receive and add up the information of obtaining that transceiver reports;
Timer is used for regularly, when described obtain that the Information Statistics module do not receive in the given time that transceiver reports obtain information the time, impel the described module of choosing to choose transceiver again and send described synchronous pilot signal.
The embodiment of the invention also proposes a kind of system that realizes sign synchronization on the one hand, comprising:
Synchronous centre manager, be used to choose transceiver and send synchronous pilot signal, receive report obtain information after, statistics is also stored the described information of obtaining, do not receive describedly when obtaining information in the given time, choose transceiver in the transceiver of synchronous pilot signal and send described synchronous pilot signal not reporting the information of obtaining or do not send again.
Transceiver is used to obtain the symbol period original position of crosstalk signal, be the symbol period original position of described crosstalk signal synchronously with the symbol period original position of pre-sent signal, according to the symbol period original position transmission signal of the signal after synchronously.
The technical scheme of the embodiment of the invention has the following advantages:
Realize the sign synchronization between each circuit; Solve the synchronous problem of OFDM multi-channel multiplexing symbols, guaranteed the orthogonality in the OFDM multi-channel multiplexing symbols process of transmitting.
Description of drawings
Fig. 1 is the present invention's xDSL system reference of the prior art model schematic diagram;
Fig. 2 is the present invention's OFDM subcarrier of the prior art schematic diagram;
Fig. 3 destroys schematic diagram for the present invention's orthogonality of the prior art;
Fig. 4 is the method flow schematic diagram of the realization sign synchronization in the embodiment of the invention one;
Fig. 5 is the detection near-end cross schematic symbol diagram in the embodiment of the invention two;
Fig. 6 is the synchronous central management system schematic diagram in the embodiment of the invention three;
Fig. 7 is that the synchronous pilot signal in the embodiment of the invention three sends and the relay schematic diagram;
Fig. 8 is the view of the synchronous centre manager control transceiver in the embodiment of the invention three;
Fig. 9 is the pilot signal relay scheme sign synchronization schematic diagram in the embodiment of the invention three;
Figure 10 is the structural representation that near end crosstalk signals realizes the device of sign synchronization that passes through in the embodiment of the invention;
Figure 11 is that the synchronous pilot signal of passing through in the embodiment of the invention realizes the system of sign synchronization and the structural representation of device.
Embodiment
The embodiment of the invention provides a kind of method, system and device of realizing sign synchronization, realizes the signal Synchronization between each circuit effectively; Solve the synchronous problem of orthogonal frequency division multiplex signal, guaranteed the orthogonality in the orthogonal frequency division multiplex signal process of transmitting.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
Crosstalking is the inevitable outcome of Modern Digital System, is the coupling between two signal line, mutual inductance between the holding wire and the mutual noise that causes on the line that holds.The capacitive coupling causes couple current, and inductive coupled initiation coupled voltages.The electrical characteristic of the parameter of pcb board layer, holding wire spacing, drive end and receiving terminal and line end connect mode all certain influence to crosstalking.
Use at all circuits under the precondition of identical symbol lengths, the embodiment of the invention one provides a kind of method that realizes sign synchronization, as shown in Figure 4, may further comprise the steps:
Step S401 obtains the symbol period original position of crosstalk signal.
Concrete, can obtain the symbol period original position of near end crosstalk signals, also can obtain the symbol period original position of the crosstalk signal that synchronous pilot signal that transceiver sends causes.After described synchronous pilot signal causes crosstalk signal, can make the symbol period original position of the signal that this group transceiver sends identical with the symbol period original position of its crosstalk signal that causes, the symbol period original position unanimity of the signal that this sample group transceiver sends, the crosstalk phenomenon that produces in the time of can avoiding each transceiver to send signal simultaneously.
Step S402 is the symbol period original position of described crosstalk signal with the symbol period original position of pre-sent signal synchronously.
Concrete, pre-sent signal can be orthogonal frequency division multiplex signal, also can be CDMA signal or pulse signal or other self-defined signals.
Step S403 sends signal according to the symbol period original position synchronously.
The embodiment of the invention two is applied to embodiment one in the concrete scene, utilizes the symbol period original position of near end crosstalk signals to carry out the transmission of orthogonal frequency division multiplex signal.Detailed process is as follows:
(the local side transceiver is VTU-O to transceiver VTU, the user side transceiver is VTU-R, this transceiver can be digital subscriber line access multiplex DSLAM) detect near-end cross at initial phase, the symbol period original position of the orthogonal frequency division multiplex signal that sends by transceiver and the synchronous mode of symbol period original position of near end crosstalk signals realize the sign synchronization between each circuit.
In the agreement of VDSL2 (G.993.2), stipulate: in the VDSL2 activation, the start-up portion of initial phase, the both sides of VTU do not send any signal.In this time the inside, local side VDSL transceiver VTU-O detects near end crosstalk signals, the symbol period original position of storage near end crosstalk signals, and in the process of follow-up transmission signal, the symbol period original position of transmission signal and the symbol period original position of near end crosstalk signals are overlapped.Fig. 5 detects the near end crosstalk signals schematic diagram in the present embodiment two, as shown in the figure, the symbol period of near end crosstalk signals 1000 is identical with the symbol period of OFDM, and being achieved as follows of present embodiment is described:
At first, transceiver obtains the symbol period original position 2000 of near end crosstalk signals.
Secondly, this transceiver is adjusted the symbol period original position that sends orthogonal frequency division multiplex signal according to the symbol period original position 2000 of described near end crosstalk signals.When the symbol period original position of described orthogonal frequency division multiplex signal overlapped with the symbol period original position of described near end crosstalk signals, this transceiver sent this orthogonal frequency division multiplex signal.Promptly the processes of 4000 expressions are that symbol period original position with orthogonal frequency division multiplex signal is the symbol period original position of near end crosstalk signals synchronously among the figure, because the symbol of described near end crosstalk signals is identical with the symbol lengths and the symbol period of described orthogonal frequency division multiplex signal, can effectively guarantee synchronous between the signal.
The embodiment of the invention three is used under the precondition of identical symbol lengths at all circuits, a kind of method that realizes sign synchronization is provided, select the transceiver relay to send synchronous pilot signal by synchronous centre manager, realize a plurality of transceiver synchronized transmission orthogonal frequency division multiplex signals.
Fig. 6 is the synchronous central management system schematic diagram in the present embodiment, and transceiver is that example is described with DSLAM, includes but not limited to DSLAM.
Fig. 7 is that the synchronous pilot signal in the synchronous central management system of present embodiment sends and the relay schematic diagram, as shown in the figure, comprising:
Step S1, after a DSLAM started, the transceiver of all of the port entered and detects the NEXT signal condition.Arbitrary transceiver of being chosen DSLAM by synchronous centre manager sends the first synchronous pilot signal 5000, and this first synchronous pilot signal 5000 passes to other transceiver among this group transceiver by crosstalk channels.Describedly can choose according to default rule when choosing transceiver, also can picked at random, the mode of choosing certainly is not limited to above-described dual mode.The symbol period of the crosstalk signal that the described first synchronous pilot signal 5000 causes is identical in the cycle of the symbol in Initialization/Showtime stage with the symbol of orthogonal frequency division multiplex signal.
Step S2 after the synchronous pilot signal of transceiver detection to the first, obtains the symbol period original position of this first synchronous pilot signal 5000, reports the information of obtaining 6000 to synchronous centre manager then.This obtains the symbol period original position that information 6000 is used to represent to get access to synchronous pilot signal.
Step S3, centre manager receives the information of obtaining 6000 backs it is added up storage synchronously, picks up counting simultaneously.In the scheduled time T, as a fixed signal cycle, synchronously centre manager is not chosen a transceiver in this group reports the transceiver of detection information, and this transceiver sends the second synchronous pilot signal 5000 identical with the first synchronous pilot signal.By that analogy, can make this organize more transceiver and receive this synchronous pilot signal, avoid synchronous centre manager to select transceiver to send synchronous pilot signal continually.The described fixed signal cycle is the integral multiple of a signal period, for example: M signal period T (M*T).
Fig. 8 is the view of the synchronous centre manager control transceiver in the synchronous central management system of present embodiment, represent not report the information of obtaining and do not send synchronous pilot signal with white circular, dark circles is represented to report the information of obtaining or has been sent synchronous pilot signal.Shown in Fig. 8 a, all transceivers did not all report the information of obtaining and do not send synchronous pilot signal when DLAM started; Shown in Fig. 8 b, after sending synchronous pilot signal for the first time, the part transceiver has reported the information of obtaining or has sent synchronous pilot signal; Shown in Fig. 8 c, do not receive the reporting when obtaining message of transceiver in the given time, reselect new transceiver again and send synchronous pilot signal, repeat above-mentioned steps, after the N time synchronous pilot signal of transmission, most transceivers have reported the information of obtaining or have sent synchronous pilot signal; Shown in Fig. 8 d, finally all transceivers have reported the information of obtaining or have sent synchronous pilot signal, and the set that does not promptly report symbol period original position that gets access to synchronous pilot signal and the transceiver that sends synchronous pilot signal is for empty.
Step S4, Fig. 9 sends the synchronous pilot signal relay scheme sign synchronization schematic diagram of signal once more for arbitrary transceiver in the synchronous central management system of present embodiment, as shown in the figure, when this transceiver sends signal first, this transceiver corresponding port writes down the symbol period original position 2000 of the synchronous pilot signal of described transmission, in the process that activates, when proceeding to initial phase, send orthogonal frequency division multiplex signals in the symbol period original position 2000 of the synchronous pilot signal of described record.This step is realized by transceiver, comprise: the symbol period original position 2000 of obtaining the synchronous pilot signal of record, then when the symbol period original position of described orthogonal frequency division multiplex signal overlaps with the symbol period original position 2000 of described synchronous pilot signal, send described orthogonal frequency division multiplex signal, i.e. 4000 represented processes.
The embodiment of the invention two realizes the sign synchronization between each circuit by the cycle original position of transceiver in the starting stage of line activation detection near end crosstalk signals.The embodiment of the invention three makes the concentrated ofdm signal that sends of symbol period original position of this synchronous pilot signal of transceiver basis by centre manager guiding and the synchronous pilot signal of relay at the initial phase of line activation; Solved the problem of OFDM sign synchronization, made the performance of DSM perform to best effect.
The embodiment of the invention proposes a kind of system that realizes sign synchronization on the one hand, this system can be used between a plurality of DSLAM, perhaps the inner or a plurality of veneer ports of DSLAM are synchronous etc., as shown in figure 11, the system of the realization sign synchronization that provides of the embodiment of the invention can comprise a kind of communicator.
Described communicator is not only DSLAM can also be applied to wireless domain, and for example: WiFi, Wimax comprise:
Transceiver 1 is used to obtain the symbol period original position of crosstalk signal, be the symbol period original position of described crosstalk signal synchronously with the symbol period original position of pre-sent signal, according to the symbol period original position transmission signal of the signal after synchronously.
This transceiver 1 (also can be other system that realizes sign synchronization) comprising:
Sending module 13 is used for sending signal according to the symbol period original position of synchronization module 12 signal after synchronously.
When this transceiver 1 serves as when sending signal with the symbol period original position of near end crosstalk signals, as shown in figure 11, also comprise:
When this transceiver 1 serves as when sending signal with the symbol period original position of synchronous pilot signal, as shown in figure 11, also comprise:
Synchronous pilot signal sending module 16 after being used for described receiver module 15 and receiving request, sends synchronous pilot signal;
After the synchronous pilot signal that this synchronous pilot signal sending module 16 sends caused crosstalk signal, first acquisition module 11 obtained the symbol period original position of this crosstalk signal.
When the symbol period original position according to synchronous pilot signal sent signal, as Figure 12, this system can further include synchronous centre manager 2, and this synchronous centre manager 2 comprises:
Choose module 21, be used to choose transceiver and send synchronous pilot signal, and issue the synchronous pilot signal request that sends to the described transceiver of having chosen;
Concrete, this request is received by the receiver module in the transceiver 15.
Obtain Information Statistics module 22, be used to receive and add up the information of obtaining that transceiver reports;
Timer 23 is used for regularly, when described obtain that Information Statistics module 22 do not receive in the given time that transceiver reports obtain information the time, impel the described module 21 of choosing to choose transceiver again and send described synchronous pilot signal.
By the description of the foregoing description, the embodiment of the invention has the following advantages:
Detect near end crosstalk signals or synchronous pilot signal by transceiver in the starting stage of line activation,, realize the sign synchronization between each circuit according to the symbol period original position transmission signal of near end crosstalk signals or synchronous pilot signal; Solve the problem of sign synchronization, guaranteed the orthogonality in the signal process of transmitting.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
The scheme of the content record of claim also is the protection range of the embodiment of the invention.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize based on such understanding by the mode that software adds necessary general hardware platform, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
Claims (12)
1, a kind of method that realizes sign synchronization is characterized in that, comprising:
Obtain the symbol period original position of crosstalk signal;
With the symbol period original position of pre-sent signal is the symbol period original position of described crosstalk signal synchronously;
Send signal according to the symbol period original position synchronously.
2, realize the method for sign synchronization according to claim 1, it is characterized in that the signal of described pre-transmission is an orthogonal frequency division multiplex signal.
3, realize the method for sign synchronization according to claim 1, it is characterized in that the described symbol period original position of obtaining crosstalk signal specifically comprises:
Obtain the symbol period original position of near end crosstalk signals.
4, realize the method for sign synchronization according to claim 1, it is characterized in that the described symbol period original position of obtaining crosstalk signal specifically comprises:
Obtain the symbol period original position of the crosstalk signal that synchronous pilot signal causes.
5, as the method for realization sign synchronization as described in the claim 4, it is characterized in that, describedly obtain synchronous pilot signal and specifically comprise:
Arbitrary transceiver is sent synchronous pilot signal by after centre manager is chosen synchronously.
6, as the method for realization sign synchronization as described in claim 4 or 5, it is characterized in that, also comprise after the described symbol period original position of obtaining the crosstalk signal that synchronous pilot signal causes:
Report the information of obtaining to synchronous centre manager;
Describedly obtain the symbol period original position that information is used to represent to get access to the crosstalk signal that synchronous pilot signal causes;
Described synchronous centre manager statistics is also stored the described information of obtaining that reports;
Described synchronous centre manager picks up counting, and does not receive describedly when obtaining information in the given time, chooses transceiver in the transceiver of synchronous pilot signal and sends described synchronous pilot signal not reporting the information of obtaining or do not send again.
7, as the method for realization sign synchronization as described in the claim 5, it is characterized in that, after the synchronous pilot signal of described transmission, also comprise:
The described transceiver corresponding port that is selected writes down the symbol period original position of described synchronous pilot signal;
When the described transceiver that is selected sends signal once more, send signal according to the symbol period original position of the synchronous pilot signal of described record.
8, a kind of communicator is characterized in that, comprising:
First acquisition module is used to obtain the symbol period original position of crosstalk signal;
Synchronization module is used for the symbol period original position with the synchronous crosstalk signal that obtains for described first acquisition module of symbol period original position of pre-sent signal;
Sending module is used for sending signal according to the symbol period original position of the signal of synchronization module after synchronously.
9, as communicator as described in the claim 8, it is characterized in that, also comprise:
Second acquisition module is used to obtain the symbol period original position of near end crosstalk signals.
10, as communicator as described in the claim 8, it is characterized in that, also comprise:
Receiver module is used to receive the synchronous pilot signal request of transmission that synchronous centre manager issues;
Synchronous pilot signal sending module after being used for described receiver module and receiving request, sends synchronous pilot signal;
Reporting module when being used for described first acquisition module and getting access to crosstalking that synchronous pilot signal that described synchronous pilot signal sending module sends causes, reports the information of obtaining.
11, a kind of synchronous centre manager is characterized in that, comprising:
Choose module, be used to choose transceiver and send synchronous pilot signal, and issue the synchronous pilot signal request that sends to the described transceiver of having chosen;
Obtain the Information Statistics module, be used to receive and add up the information of obtaining that transceiver reports;
Timer is used for regularly, when described obtain that the Information Statistics module do not receive in the given time that transceiver reports obtain information the time, impel the described module of choosing to choose transceiver again and send described synchronous pilot signal.
12, a kind of system that realizes sign synchronization is characterized in that, comprising:
Synchronous centre manager, be used to choose transceiver and send synchronous pilot signal, receive report obtain information after, statistics is also stored the described information of obtaining, do not receive describedly when obtaining information in the given time, choose transceiver in the transceiver of synchronous pilot signal and send described synchronous pilot signal not reporting the information of obtaining or do not send again;
Transceiver is used to obtain the symbol period original position of crosstalk signal, be the symbol period original position of described crosstalk signal synchronously with the symbol period original position of pre-sent signal, according to the symbol period original position transmission signal of the signal after synchronously.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100979331A CN101588336B (en) | 2008-05-19 | 2008-05-19 | Method, system and device for realizing symbol synchronization |
| PCT/CN2009/071662 WO2009140890A1 (en) | 2008-05-19 | 2009-05-06 | A method, a system, and an apparatus for realizing symbol synchronization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100979331A CN101588336B (en) | 2008-05-19 | 2008-05-19 | Method, system and device for realizing symbol synchronization |
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| Publication Number | Publication Date |
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| CN101588336A true CN101588336A (en) | 2009-11-25 |
| CN101588336B CN101588336B (en) | 2012-12-19 |
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| CN2008100979331A Expired - Fee Related CN101588336B (en) | 2008-05-19 | 2008-05-19 | Method, system and device for realizing symbol synchronization |
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| CN (1) | CN101588336B (en) |
| WO (1) | WO2009140890A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103765789A (en) * | 2013-09-18 | 2014-04-30 | 华为技术有限公司 | Line initialization method, apparatus, and system |
| CN110741574A (en) * | 2017-03-15 | 2020-01-31 | Oppo广东移动通信有限公司 | Signal transmission method, terminal equipment and network equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2735008B2 (en) * | 1994-10-26 | 1998-04-02 | 日本ビクター株式会社 | Symbol period detection circuit for orthogonal frequency division multiplexed signal receiver |
| JP3568180B2 (en) * | 1997-06-12 | 2004-09-22 | 株式会社日立国際電気 | Data transmission equipment |
| US6134283A (en) * | 1997-11-18 | 2000-10-17 | Amati Communications Corporation | Method and system for synchronizing time-division-duplexed transceivers |
| EP1093248B1 (en) * | 1999-10-13 | 2003-07-02 | STMicroelectronics N.V. | Symbol synchronisation in a DMT system with crosstalk interference |
| US6724849B1 (en) * | 2000-02-29 | 2004-04-20 | Centillium Communications, Inc. | Method and apparatus for timing recovery in ADSL transceivers under a TCM-ISDN crosstalk environment |
| JP3960747B2 (en) * | 2000-11-13 | 2007-08-15 | 株式会社日立国際電気 | Digital transmission equipment |
| KR100833223B1 (en) * | 2001-07-11 | 2008-05-28 | 삼성전자주식회사 | OFDM receving system for synchronizing symbol timing using guard interval and method thereof |
| KR20040009938A (en) * | 2002-07-26 | 2004-01-31 | 주식회사 오픈솔루션 | Apparatus and method for recovery symbol timing in the ofdm system |
| US20040136405A1 (en) * | 2002-11-14 | 2004-07-15 | Guozhu Long | Obtaining and maintaining TTR synchronization during DSL transceiver channel discovery phase in presence of TCM-ISDN noise |
| AU2003283735A1 (en) * | 2002-12-20 | 2004-07-14 | Koninklijke Philips Electronics N.V. | Asynchronous crosstalk cancellation |
| KR100769855B1 (en) * | 2003-04-30 | 2007-10-24 | 주식회사 휴커넥스 | Symbol Synchronization Apparatus Using DMT Method in xDSL Modem |
| CN1852282A (en) * | 2006-04-24 | 2006-10-25 | 上海交通大学 | Channel decoding and symbol demapping synchronizing method |
| CN101060512B (en) * | 2006-06-30 | 2010-12-08 | 华为技术有限公司 | OFDM transmission symbol synchronizing method and its system |
| CN101056296A (en) * | 2007-05-25 | 2007-10-17 | 东南大学 | Orthogonal frequency division multiplexing symbol timing synchronization method used for the multi-path fading channel environment |
-
2008
- 2008-05-19 CN CN2008100979331A patent/CN101588336B/en not_active Expired - Fee Related
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- 2009-05-06 WO PCT/CN2009/071662 patent/WO2009140890A1/en active Application Filing
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103765789A (en) * | 2013-09-18 | 2014-04-30 | 华为技术有限公司 | Line initialization method, apparatus, and system |
| CN103765789B (en) * | 2013-09-18 | 2015-06-10 | 华为技术有限公司 | Line initialization method, apparatus, and system |
| CN110741574A (en) * | 2017-03-15 | 2020-01-31 | Oppo广东移动通信有限公司 | Signal transmission method, terminal equipment and network equipment |
| US11791923B2 (en) | 2017-03-15 | 2023-10-17 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for transmitting signal, terminal device and network device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101588336B (en) | 2012-12-19 |
| WO2009140890A1 (en) | 2009-11-26 |
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