CN103078821B - One realizes up character boundary synchronous method, system and vector quantization controlled entity - Google Patents
One realizes up character boundary synchronous method, system and vector quantization controlled entity Download PDFInfo
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- CN103078821B CN103078821B CN201210586216.1A CN201210586216A CN103078821B CN 103078821 B CN103078821 B CN 103078821B CN 201210586216 A CN201210586216 A CN 201210586216A CN 103078821 B CN103078821 B CN 103078821B
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Abstract
The present invention is applicable to communication technical field, provide one to realize up character boundary synchronous method, system and vector quantization controlled entity, described method is applied to central office CO end, described CO end comprises that the operator of the loop that vector quantization controlled entity VCE and multiple and described VCE be connected holds VTU-O, described method comprises: described VCE obtains the first lead according to the line length of multiple VTU-O, and described line length is the line length of described VTU-O to respective user fore device CPE; The downstream signal that described VCE holds described the first lead as CO sends to described multiple VTU-O with respect to the character boundary lead of upward signal, to make described multiple VTU-O in the time receiving described the first lead, adjust up character boundary according to described the first lead. By the present invention, can effectively ensure up character boundary synchronous of different circuits.
Description
Technical field
The invention belongs to communication technical field, relate in particular to one and realize up character boundary synchronous method, beSystem and vector quantization controlled entity.
Background technology
Industry has proposed Vectored-DSL(vector quantization digital subscriber line at present) technology, mainly utilizeJoin at digital subscriber line (DigitalSubscriberLine, DSL) couple in multiplexer (DSLAM) endClose the possibility of transmitting-receiving, offset the interference of cross-talk by the method for signal processing.
In order to eliminate the interference of cross-talk, need to introduce cross-talk Canceller W at up direction, and descendingIntroduce a precoder P. Taking P as example, the port number of supposing to have cross-talk relation is M=256,The matrix element number of W is M*M=256*256.
For example, in ofdm system (xDSL), each tone has a corresponding W matrix,Suppose to have 2048 tone, total matrix element number is 256*256*2048=134217728, has 1.34Hundred million elements.
Even if do not consider the complexity of the algorithm that calculates each element, also can find out this by the number of elementAmount of calculation is that very huge, required internal memory is also very large, and cost is huge. Therefore in real system,Need to adopt several different methods to reduce this amount of calculation and memory space. Wherein a kind of method is: adjacent is someIndividual tone shares a cross-talk and offsets coefficient, for example, can share a cross-talk by 32 toneOffset coefficient, like this, amount of calculation above and memory space are reduced to original 1/32 quickly.
But it is hypothetical that multiple tone share a cross-talk counteracting coefficient, except requiring different toneBetween cross-talk channel approach beyond, also require the downstream signal of different user at central office (CentralOffice, CO) transmitting terminal and upward signal be synchronous at the character boundary of CO receiving terminal. Although protectThe character boundary of downstream signal of demonstrate,proving different circuits is synchronously relatively easy, because the control of transmitting terminal exists completelyCO side, in other words, when CO is sent out if just thinking when to send out. But, the symbol of guarantee upward signalNumber border is synchronously more difficult, because upward signal is by user front end device (CustomerPremisesEquipment, CPE) send, and the line length of different user process etc. all may be different, causeThe character boundary that arrives the signal of CO receiver side may exist asynchronous.
Summary of the invention
The object of the embodiment of the present invention is to provide one to realize up character boundary synchronous method, existing to solveThere is technology cannot ensure the synchronous problem of user uplink character boundary of different line lengths.
The first aspect of the embodiment of the present invention, provides one to realize up character boundary synchronous method, is applied toCentral office CO end, described CO end comprises that vector quantization controlled entity VCE and multiple and described VCE connectThe end VTU-O of operator of the loop connecing, described method comprises:
Described VCE obtains the first lead according to the line length of multiple VTU-O, and described line length isDescribed VTU-O is to the line length of respective user fore device CPE;
The downstream signal that described VCE holds described the first lead as CO is with respect to the symbol of upward signalBorder lead sends to described multiple VTU-O, to make described multiple VTU-O receive describedWhen one lead, adjust up character boundary according to described the first lead.
In the first of first aspect may implementation, describedly adjust on it according to described the first leadRow character boundary comprises:
According to described the first lead, by the related news notice user front end device CPE of timing advance TAAdjust up character boundary.
May implementation in conjunction with the first of first aspect or first aspect, described according to described first in advanceAmount is adjusted its up character boundary and is comprised:
According to described the first lead, adjust up character boundary by the mode of symbol aligned SA.
May in conjunction with the first possibility implementation of first aspect or first aspect or the second of first aspectImplementation, in the third may implementation, describedly adjusts its up symbol according to described the first leadNumber border comprises:
According to described the first lead, by the input of cross-talk Canceller or phase of output signal are compensatedMode adjust up character boundary.
May in conjunction with the first possibility implementation of first aspect or first aspect or the second of first aspectThe third possibility implementation of implementation or first aspect, in the 4th kind of possibility implementation, described inVCE obtains the first lead according to the line length of multiple VTU-O and comprises:
During described VCE holds according to CO, the longest VTU-O line length and the shortest VTU-O circuitThe median of length is obtained the first lead.
Second aspect, one realizes up character boundary synchro system, is applied to central office CO end, described inCO end comprises that the operator of the loop that vector quantization controlled entity VCE and multiple and described VCE be connected holdsVTU-O，
Described VCE, for obtaining the first lead according to the line length of multiple VTU-O, and described in inciting somebody to actionThe first lead sends to institute as the downstream signal of CO end with respect to the character boundary lead of upward signalState multiple VTU-O, described line length is the circuit of described VTU-O to respective user fore device CPELength;
Described VTU-O, for receiving described the first lead, and adjusts up according to described the first leadCharacter boundary.
In the first of second aspect may implementation, described VTU-O specifically for:
According to described the first lead, by the related news notice user front end device CPE of timing advance TAAdjust up character boundary.
In conjunction with the first possibility implementation of second aspect or second aspect, may implementation at the secondIn, described VTU-O specifically for:
According to described the first lead, adjust up character boundary by the mode of symbol aligned SA.
May in conjunction with the first possibility implementation of second aspect or second aspect or the second of second aspectImplementation, in the third may implementation, described VTU-O specifically for:
According to described the first lead, by the input of cross-talk Canceller or phase of output signal are compensatedMode adjust up character boundary.
May in conjunction with the first possibility implementation of second aspect or second aspect or the second of second aspectThe third possibility implementation of implementation or second aspect, in the 4th kind of possibility implementation, described inVCE specifically for, according in CO end, the longest VTU-O line length and the shortest VTU-O circuitThe median of length is obtained the first lead.
The third aspect, a kind of vector quantization controlled entity VCE, described VCE comprises:
Acquiring unit, for obtaining the first lead according to the line length of multiple VTU-O, described circuitLength is the line length of described VTU-O to respective user fore device CPE;
Transmitting element, for using described the first lead as CO end downstream signal with respect to upward signalCharacter boundary lead send to described multiple VTU-O, so that described multiple VTU-O is being receivedWhen described the first lead, adjust up character boundary according to described the first lead.
In the first of the third aspect may implementation, described transmitting element specifically for, by described theOne lead sends to described multiple VTU-O, to make described multiple VTU-O receive described firstWhen lead, according to described the first lead, by the related news notice user front end of timing advance TADevice CPE adjusts up character boundary.
In conjunction with the first possibility implementation of the third aspect or the third aspect, may implementation at the secondIn, described transmitting element specifically for, described the first lead is sent to described multiple VTU-O so thatObtain described multiple VTU-O in the time receiving described the first lead, according to described the first lead, pass throughThe mode of symbol aligned SA is adjusted up character boundary.
May in conjunction with the first possibility implementation of the third aspect or the third aspect or the second of the third aspectImplementation, in the third may implementation, described transmitting element specifically for, carry described firstFront amount sends to described multiple VTU-O, to make described multiple VTU-O receive described first in advanceWhen amount, according to described the first lead, by the input of cross-talk Canceller or phase of output signal are mendedThe mode of repaying is adjusted up character boundary.
May in conjunction with the first possibility implementation of the third aspect or the third aspect or the second of the third aspectThe third possibility implementation of implementation or the third aspect, in the 4th kind of possibility implementation, described inAcquiring unit specifically for, according in CO end, the longest VTU-O line length and the shortest VTU-OThe median of line length is obtained the first lead.
The beneficial effect that the embodiment of the present invention compared with prior art exists is: by VCE according to multipleThe line length of VTU-O is obtained the first lead, and the descending letter of holding described the first lead as CONumber send to described multiple VTU-O with respect to the character boundary lead of upward signal, described multiple to makeVTU-O, in the time receiving described the first lead, adjusts up Signed Edge according to described character boundary leadBoundary. Because descending character boundary is synchronous, up character boundary is with respect to the side-play amount of descending character boundaryBe unified again adjust to consistent, thereby can effectively ensure up character boundary synchronous of different circuits, makeBetween different tone, can share cross-talk and offset coefficient, and then effectively reduce amount of calculation and storage demand.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below will be to embodiment or existing skillIn art description, the accompanying drawing of required use is briefly described, and apparently, the accompanying drawing in the following describes onlyBe only some embodiment of the application, for those of ordinary skill in the art, do not paying creative laborUnder the prerequisite of moving property, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 be one embodiment of the invention provide realize the applicable system field of up character boundary synchronous methodJing Tu;
Fig. 2 is the realization flow of realizing up character boundary synchronous method that another embodiment of the present invention providesFigure;
Fig. 3 controls the synchronous position view of up character boundary;
Fig. 4 is the composition structure chart of the vector quantization controlled entity that provides of another embodiment of the present invention;
Fig. 5 is the composition structure chart of the vector quantization controlled entity that provides of another embodiment of the present invention.
Detailed description of the invention
In below describing, in order to illustrate instead of in order to limit, proposed such as particular system structure, interface,The detail of technology and so on, understands the application to thoroughly cut. But those skilled in the art should be clearChu also can realize the application in other embodiment that there is no these details. In other situation,Omit the detailed description to well-known device, circuit and method, in order to avoid unnecessary details hinders thisThe description of application.
The techniques described herein may be used in various communication systems, for example xdsl communication system, current 2G,3G communication system and next generation communication system, for example ADSL (AsymmetricDigitalSubscriberLine, ADSL), very-high-bit-rate digital subscriber loop (Very-high-bit-rateDigitalSubscriberloop, VDSL), global system for mobile communications (GSM, GlobalSystemforMobileCommunications), CDMA (CDMA, CodeDivisionMultipleAccess) system,Time division multiple acess (TDMA, TimeDivisionMultipleAccess) system, WCDMA(WCDMA, WidebandCodeDivisionMultipleAccessWireless), frequency division multiple access(FDMA, FrequencyDivisionMultipleAddressing) system, OFDM(OFDMA, OrthogonalFrequency-DivisionMultipleAccess) system, Single Carrier Frequency Division Multiple Access(SC-FDMA) system, GPRS (GPRS, GeneralPacketRadioService)System, Long Term Evolution (LTE, LongTermEvolution) system, and other these type of communication systems.
In addition, in the embodiment of the present invention, term " system " and " network " often can be exchanged and be used in this article.
What Fig. 1 showed that one embodiment of the invention provides realize, and up character boundary synchronous method is suitable for isSystem scene, for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
This system scene comprises CO end 1 and cpe end 2. Described CO end 1 comprises vector quantization controlled entityThe operator of the loop that (VectoringControlEntity, VCE) 11 and multiple and described VCE11 are connectedEnd (VTU-O) 12.
Wherein, described cpe end 2 can be the terminal device arbitrarily with communication function, includes but not limited toMobile phone, panel computer, desktop computer, notebook computer etc.
In the present embodiment, CO end 1 is in the situation that ensureing that descending character boundary is synchronous, at CO end 1And before cpe end 2 activation, described VCE11 obtains first according to the line length of multiple VTU-O and carriesFront amount, and send to described CO to hold multiple VTU-O12 of 1 loop described the first lead, described manyIndividual VTU-O12, in the time receiving described the first lead, adjusts up symbol according to described the first leadBorder is synchronous to realize.
Wherein, described line length is the line length of described VTU-O to respective user fore device CPE(it should be noted that, described VTU-O can corresponding multiple user front end device CPE). Described firstLead is the downstream signal phase of the CO1 end that obtains according to multiple VTU-O12 line lengths of described VCE11For the character boundary lead of upward signal, described line length is between nose road length and generic lineBetween length, preferably, described line length is the median of nose road length and generic line length.
Preferably, the mode that VTU-O12 adjusts up character boundary according to described the first lead comprise butBe not limited to following at least one:
Mode one: VTU-O12 is according to described the first lead, by timing advance (Timingadvance,TA) it is synchronous to realize that related news notice user front end device CPE adjusts up character boundary.
Mode two: VTU-O12 is according to described the first lead, by symbol aligned (SymbolAlignment, SA) mode to adjust up character boundary synchronous to realize.
Mode three: VTU-O12 is according to described the first lead, by cross-talk Canceller is inputted or outputIt is synchronous to realize that the mode that signal phase compensates is adjusted up character boundary.
The system scene that the present embodiment provides, only for explaining the present invention, does not limit protection scope of the present invention.
Another embodiment:
The up character boundary synchronous method of realizing that Fig. 2 shows another embodiment of the present invention to be provided is realized streamJourney, the method can be applicable in the system scene shown in Fig. 1, and details are as follows for the method process.
In S201, VCE obtains the first lead according to the line length of multiple VTU-O.
In the present embodiment, described line length is that described VTU-O is to respective user fore device CPE'sLine length.
Exemplary, during VCE holds according to CO, the longest VTU-O line length and the shortest VTU-OThe median of line length is obtained the first lead,Wherein L represents that nose road is longThe median of degree and generic line length, C represents the light velocity.
In S202, the downstream signal that VCE holds described the first lead as CO is with respect to up letterNumber character boundary lead send to described multiple VTU-O, with make described multiple VTU-O receiveDuring to described the first lead, adjust up character boundary according to described the first lead.
In the present embodiment, to obtain the coincidence boundary lead of self (be CO end downstream signal to each VTU-OWith respect to the character boundary lead of upward signal), in the present embodiment, for convenience of description, will be eachThe coincidence boundary lead that VTU-O obtains self is designated as TA_O.
First CO end ensures that the descending character boundary of all users is synchronous, and swashs at CO end and cpe endBefore work, the VCE holding by CO obtains the first lead according to the line length of multiple VTU-O, is designated asTA_O_Req, and described the first lead is sent to each VTU-O on described CO end ring road, eachVTU-O, in the time receiving described the first lead, adjusts up character boundary according to described the first lead(it should be noted that, each VTU-O is in the time receiving described the first lead, according to described hereOne lead is adjusted up character boundary, refers to some VTU-O and is receiving described the first leadTime, adjust up character boundary according to described the first lead, instead of refer to that all VTU-O are receivingDuring to described the first lead, just adjust up character boundary according to described the first lead). Wherein, instituteState the first lead and be the descending letter of the CO end that described VCE obtains according to the line length of multiple VTU-ONumber with respect to the character boundary lead of upward signal, described line length between nose road length with the shortestBetween line length, preferably, the median of nose road length and generic line length. For example onlineIn 0 ~ 1500 meter of road length, TA_O_Req can obtain the length of 0 ~ 1500 meter of centre (as 750 metersLine length).
It should be noted that, in order to meet the demand of different application scene, in actual applications, for avoiding lineWhen road length is long, the echo of cpe end (Echo) performance is influenced, also can be long for different circuitsDegree adopts Different Strategies, for example, for the port that exceedes a certain line length, does not force to obtain TA_O_Req.
It should be noted that in addition, the TA_O_Req of prior art is that VTU-O is long according to the circuit of oneselfDegree obtains, and only considers the situation of circuit separately; And that the TA_O_Req of the present embodiment is VCE is comprehensiveIn CO end, each VTU-O line length situation is selected, and has taken into account the situation of all VTU-O circuits, exampleAs in the situation that can obtaining each line length, the median institute that obtains nose road and generic line is correspondingTA_O_Req; If cannot obtain each line length, obtain 0 ~ 1500 meter of median correspondingTA_O_Req。
In the present embodiment, VTU-O, in the process activating, judges whether described TA_O_Req equals instituteState TA_O, if be not equal to, illustrate that up character boundary is asynchronous, adjust up character boundary to realizeSynchronously, concrete is to adjust up character boundary to realize synchronous between different VTU-O.
Preferably, the present embodiment VTU-O12 adjusts up character boundary according to described the first leadMode include but not limited to following at least one:
Mode one: VTU-O12 is according to described the first lead, by the related news notice CPE of TAAdjust up character boundary synchronous to realize.
In the present embodiment, the value of TA holds the message between cpe end to come alternately by CO, and finalThe VTU-O being held by CO determines, in 993.2 agreements, first the initial value of TA is passed through by CO endO-SIGNATURE message informing cpe end, when follow-up adjustment, again by O-UPDATE message andO-TA-UPDATE message is notified cpe end correction value, and for the message of CO end, CPE can pass through phaseThe message of answering is responded.
In the present embodiment, because descending character boundary is synchronous, the TA_O after adjustment equals againTA_O_Req, thus ensure that up character boundary is also synchronous.
Mode two: VTU-O12, according to described the first lead, adjusts by the mode of symbol aligned SARow character boundary is synchronous to realize. Wherein, adjustment amount is the exhausted of described TA_O_Req and described TA_O differenceTo value.
The abbreviation of SA is-symbol alignment (also claim sign synchronization, but the same circuit that synchronously refers to is here receivedSynchronous between sending out, does not refer to synchronous between different circuits, for fear of obscuring, and unification symbol hereinAlignment).
Symbol aligned is the basic fundamental of communication system, and for ofdm system, receiver needsFind correct symbol initial time, to carry out Fast Fourier Transform (FFT) (FFT) and demodulation work.The object of symbol aligned is exactly in order to find this symbol initial time.
If corresponding to same reception signal, the character boundary not doing before symbol aligned is designated as“tcurrent", desirable character boundary is designated as " tidea", the detailed process of SA is as follows:
Obtain tcurrent；
Estimate tidea；
Calculate tcurrentWith tideaDeviation SAoffset=tidea-tcurrent, unit is sample;
Skew character boundary SAoffset。
Mode three: VTU-O12 is according to described the first lead, by cross-talk Canceller is inputted or outputSignal phase carries out the mode of precompensation and adjusts up character boundary to realize synchronously.
For example, suppose tone (k+ Δ k) has used the cross-talk coefficient C (k) of tonek, for(k), its cross-talk coefficients deviation is k+ Δ tone ItsMiddle N is fftsize.
(k+ Δ FFT output data k) are that (k), phase precompensation module is output as k+ Δ fft_out to note toneFft_out_modify (k+ Δ k), and order:
Wherein the unit of TA_O and TA_O_Req is all sample.
The present embodiment, by cross-talk Canceller input data are carried out to phase precompensation, is proofreaied and correct cross-talk systemNumber shares the error causing, and ensures the correct of cross-talk Canceller Output rusults.
It should be noted that, the above-mentioned several modes of the present embodiment can independently be used, and also can combine use,To obtain better performance. As shown in Figure 3, solve the synchronous of up character boundary at diverse location, as canWith synchronous at line side character boundary by TA control signal, also can be with jointly controlling by SA and TAThe character boundary of signal before and after FFT is synchronous, can also be by cross-talk Canceller is inputed or outputed to signal phasePosition compensates to ensure that character boundary is synchronous. Wherein, described compensation bag precompensation and/or post-compensation.
Another embodiment:
Fig. 4 shows the composition structure of the vector quantization controlled entity that another embodiment of the present invention provides, for justIn explanation, only show the part relevant to the embodiment of the present invention.
This vector quantization controlled entity can run on the CO end shown in Fig. 1.
This vector quantization controlled entity VCE11 comprises acquiring unit 111 and transmitting element 112, each unit toolBody function is as follows.
Acquiring unit 111, for obtaining the first lead according to the line length of multiple VTU-O, described lineRoad length is the line length of described VTU-O to respective user fore device CPE;
Transmitting element 112, holds as CO for the first lead that described acquiring unit 111 is obtainedDownstream signal sends to described multiple VTU-O with respect to the character boundary lead of upward signal, to makeState multiple VTU-O in the time receiving described the first lead, adjust up symbol according to described the first leadNumber border.
Further, described transmitting element 112 specifically for, described the first lead is sent to described manyIndividual VTU-O, to make described multiple VTU-O in the time receiving described the first lead, according to describedOne lead, adjusts up symbol by the related news notice user front end device CPE of timing advance TABorder;
And/or, described the first lead is sent to described multiple VTU-O, to make described multiple VTU-OIn the time receiving described the first lead, according to described the first lead, by the mode of symbol aligned SAAdjust up character boundary;
And/or, described the first lead is sent to described multiple VTU-O, to make described multiple VTU-OIn the time receiving described the first lead, according to described the first lead, by cross-talk Canceller input orThe mode that person's phase of output signal compensates is adjusted up character boundary.
Further, described acquiring unit 111 specifically for, according in CO end, the longest VTU-O lineRoad length is obtained the first lead with the median of the shortest VTU-O line length.
Those skilled in the art can be well understood to, for convenience and simplicity of description, and only with above-mentionedThe division of each functional unit is illustrated, and in practical application, can as required above-mentioned functions be dividedJoin by different functional units and complete, be divided into different functional units by the internal structure of system, with completeBecome all or part of function described above. In addition, the concrete title of each functional unit is also just for justIn mutual differentiation, be not limited to the application's protection domain. The system of foregoing description and unit concreteThe course of work, can, with reference to the corresponding process in preceding method embodiment, not repeat them here.
Another embodiment:
Fig. 5 shows the composition structure of the vector quantization controlled entity that another embodiment of the present invention provides, for justIn explanation, only show the part relevant to the embodiment of the present invention.
This vector quantization controlled entity can run on the CO end shown in Fig. 1.
This vector quantization controlled entity 11 comprises processor 101 and transmitter 102, described processor 101 useIn obtaining the first lead according to the line length of multiple VTU-O, and pass through described transmitter 102 by instituteStating the first lead sends to respect to the character boundary lead of upward signal as the downstream signal of CO endDescribed multiple VTU-O, to make described multiple VTU-O in the time receiving described the first lead, according toDescribed the first lead is adjusted up character boundary and is realized synchronous. Wherein, described in described line length isVTU-O is to the line length of respective user fore device CPE.
Exemplary, described processor 101 can be according in CO end, the longest VTU-O line length withThe median of the shortest VTU-O line length is obtained the first lead
Wherein, the mode that VTU-O12 adjusts up character boundary according to described the first lead comprises but does not limitIn following at least one:
Mode one: VTU-O12 is according to described the first lead, by timing advance (Timingadvance,TA) it is synchronous to realize that related news notice user front end device CPE adjusts up character boundary.
Mode two: VTU-O12 is according to described the first lead, by symbol aligned (SymbolAlignment, SA) mode to adjust up character boundary synchronous to realize.
Mode three: VTU-O12 is according to described the first lead, by cross-talk Canceller is inputted or outputIt is synchronous to realize that the mode that signal phase compensates is adjusted up character boundary.
Processor 101 is control centres of vector quantization controlled entity VCE11, utilizes various interface and circuit to connectConnect the various piece in whole VCE11. Optionally, processor 101 can comprise that one or more processing are singleUnit, also can integrated application processor and modem processor, and wherein, application processor is mainly processed operationSystem, user interface and application program etc., modem processor is mainly processed radio communication, described wirelessCommunication can be used arbitrary communication standard or agreement, include but not limited to xdsl communication system,GSM (GlobalSystemofMobilecommunication, global system for mobile communications),GPRS (GeneralPacketRadioService, general packet radio service), CDMA (CodeDivisionMultipleAccess, CDMA), WCDMA (WidebandCodeDivisionMultipleAccess,WCDMA), LTE (LongTermEvolution, Long Term Evolution), Email, SMS (ShortMessagingService, Short Message Service) etc. Be understandable that, above-mentioned modem processor also canNot to be integrated in processor 101.
It should be noted that, it will be understood by those skilled in the art that and realize up character boundary synchro system 6Can also comprise the receiver 104 of memory 103 and the information of reception, described processor 101 is by operationBe stored in software program and the module of memory 103, thus realize VCE11 the application of various functions andData processing. Wherein, described transmitter 102, memory 103 and receiver 104 are respectively at described placeReason device 101 connects.
It will be understood by those skilled in the art that the composition structure shown in Fig. 5 does not form the restriction to VCE,Can comprise the parts more more or less than diagram, or combine some parts, or different parts are arranged.
The VCE11 that the present embodiment provides can use in synchronously side of the up character boundary of realizing of aforementioned correspondenceMethod, details are referring to the above-mentioned associated description that realizes up character boundary synchronous method embodiment, no longer superfluous at thisState.
In sum, the embodiment of the present invention obtains first by VCE according to the line length of multiple VTU-OLead, and the downstream signal of holding described the first lead as CO is with respect to the Signed Edge of upward signalBoundary's lead sends to described multiple VTU-O, to make described multiple VTU-O according to described character boundaryLead is by TA, SA and/or to modes such as cross-talk Canceller input or phase of output signal compensateAdjust up character boundary. Because descending character boundary is synchronous, up character boundary is with respect to descending symbolThe side-play amount on number border be unified again adjust to consistent, thereby can effectively ensure the up Signed Edge of different circuitsBoundary synchronous, makes can to share cross-talk between different tone and offsets coefficient, and then effectively reduce and calculateAmount and storage demand.
In several embodiment provided in this article, should be understood that, disclosed system and method, canRealize by another way. For example, system embodiment described above is only schematically, for example,The division of described module or unit, is only that a kind of logic function is divided, and can have other when actual realizationDividing mode, for example multiple unit or assembly can in conjunction with or can be integrated into another system, or someFeature can be ignored, or does not carry out. Another point, shown or discussed coupling each other or directly couplingClosing or communicate to connect can be by some interfaces, and the INDIRECT COUPLING of system or unit or communication connection, canElectrically, machinery or other form.
The described unit as separating component explanation can or can not be also physically to separate, asThe parts that unit shows can be or can not be also physical locations, can be positioned at a place, orAlso can be distributed on multiple NEs. Can select according to the actual needs wherein some or all ofThe object of the present embodiment scheme is realized in unit.
In addition, the each functional unit in each embodiment of the application can be integrated in a processing unit,Also can be that the independent physics of unit exists, also can be integrated in a unit in two or more unitIn. Above-mentioned integrated unit both can adopt the form of hardware to realize, and also can adopt SFU software functional unitForm realizes.
If described integrated unit using the form of SFU software functional unit realize and as production marketing independently orWhen use, can be stored in a computer read/write memory medium. Based on such understanding, the applicationThe part that in other words prior art contributed in essence of technical scheme or this technical scheme whole orPart can embody with the form of software product, and this computer software product is stored in a storage mediumIn, comprise some instructions in order to make a computer equipment (can be personal computer, server, orPerson's network equipment etc.) or processor (processor) carry out the whole of method described in the application each embodimentOr part steps. And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only storage (ROM,Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic discOr the various media that can be program code stored such as CD.
The above, above embodiment only, in order to the application's technical scheme to be described, is not intended to limit; To the greatest extentPipe has been described in detail the application with reference to previous embodiment, and those of ordinary skill in the art should manageSeparate: its technical scheme that still can record aforementioned each embodiment is modified, or to part whereinTechnical characterictic is equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution de-From the spirit and scope of the each embodiment technical scheme of the application.
Claims (12)
1. realize a up character boundary synchronous method, be applied to central office CO end, described CO end bagDraw together the end VTU-O of operator of the loop that vector quantization controlled entity VCE and multiple and described VCE be connected,It is characterized in that, described method comprises:
Described VCE obtains the first lead according to the line length of multiple VTU-O, and described line length isDescribed VTU-O is to the line length of respective user fore device CPE;
The downstream signal that described VCE holds described the first lead as CO is with respect to the symbol of upward signalBorder lead sends to described multiple VTU-O, to make described multiple VTU-O receive describedWhen one lead, adjust up character boundary according to described the first lead;
Describedly adjust its up character boundary according to described the first lead and comprise:
According to described the first lead, by the related news notice user front end device CPE of timing advance TAAdjust up character boundary.
2. the method for claim 1, is characterized in that, described according to described the first lead adjustmentIts up character boundary comprises:
According to described the first lead, adjust up character boundary by the mode of symbol aligned SA.
3. method as claimed in claim 1 or 2, is characterized in that, described according to described the first leadAdjusting its up character boundary comprises:
According to described the first lead, by the input of cross-talk Canceller or phase of output signal are compensatedMode adjust up character boundary.
4. method as claimed in claim 1 or 2, is characterized in that, described VCE is according to multiple VTU-OLine length obtain the first lead and comprise:
During described VCE holds according to CO, the longest VTU-O line length and the shortest VTU-O circuitThe median of length is obtained the first lead.
5. realize a up character boundary synchro system, be applied to central office CO end, described system comprisesThe end VTU-O of operator of the loop that vector quantization controlled entity VCE and multiple and described VCE are connected, itsBe characterised in that:
Described VCE, for obtaining the first lead according to the line length of multiple VTU-O, and described in inciting somebody to actionThe first lead sends to institute as the downstream signal of CO end with respect to the character boundary lead of upward signalState multiple VTU-O, described line length is the circuit of described VTU-O to respective user fore device CPELength;
Described VTU-O, for receiving described the first lead, and adjusts up according to described the first leadCharacter boundary;
Described VTU-O specifically for:
According to described the first lead, by the related news notice user front end device CPE of timing advance TAAdjust up character boundary.
6. system as claimed in claim 5, is characterized in that, described VTU-O specifically for:
According to described the first lead, adjust up character boundary by the mode of symbol aligned SA.
7. the system as described in claim 5 or 6, is characterized in that, described VTU-O specifically for:
According to described the first lead, by the input of cross-talk Canceller or phase of output signal are compensatedMode adjust up character boundary.
8. the system as described in claim 5 or 6, is characterized in that, described VCE is specifically for, rootIn CO end, the longest VTU-O line length is obtained with the median of the shortest VTU-O line lengthThe first lead.
9. a vector quantization controlled entity VCE, is applied to central office CO end, and described CO end comprises vectorThe end VTU-O of operator of the loop that change controlled entity VCE and multiple and described VCE are connected, its featureBe, described VCE comprises:
Acquiring unit, for obtaining the first lead according to the line length of multiple VTU-O, described circuitLength is the line length of described VTU-O to respective user fore device CPE;
Transmitting element, for using described the first lead as CO end downstream signal with respect to upward signalCharacter boundary lead send to described multiple VTU-O, so that described multiple VTU-O is being receivedWhen described the first lead, adjust up character boundary according to described the first lead;
Described transmitting element specifically for, described the first lead is sent to described multiple VTU-O so thatObtain described multiple VTU-O in the time receiving described the first lead, according to described the first lead, pass throughThe related news notice user front end device CPE of timing advance TA adjusts up character boundary.
10. VCE as claimed in claim 9, is characterized in that, described transmitting element specifically for, willDescribed the first lead sends to described multiple VTU-O, to make described multiple VTU-O receivingWhile stating the first lead, according to described the first lead, adjust up symbol by the mode of symbol aligned SANumber border.
11. VCE as described in claim 9 or 10, is characterized in that, described transmitting element is specifically usedIn, described the first lead is sent to described multiple VTU-O, so that described multiple VTU-O is being connectWhile receiving described the first lead, according to described the first lead, by cross-talk Canceller input or defeatedGo out the mode that signal phase compensates and adjust up character boundary.
12. VCE as described in claim 9 or 10, is characterized in that, described acquiring unit is specifically usedIn, according in CO end, the centre of the longest VTU-O line length and the shortest VTU-O line lengthValue is obtained the first lead.
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