CN102388588A - Crosstalk channel estimation method, device and system - Google Patents
Crosstalk channel estimation method, device and system Download PDFInfo
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- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
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- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/34—Testing for cross-talk
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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
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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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
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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Abstract
A crosstalk channel estimation method, a device and a system. The method includes the steps of a vector control entity (VCE) generating an orthogonal training guide frequency sequence matrix according to user's route; the VCE allocateing guide frequency sequence for each on-line user route i respectively according to the orthogonal training guide frequency sequence matrix,wherein the guide frequency sequence allocated after being modulated is sent out by a tramsmitting end Ti of each on-line user route i, and the guide frequency sequences of any two routes among the on-line user's routes are orthogonal, VCE receiving error samples sent by the receiving end Ri of each on-line user route i, wherein the error samples are obtained by the receiving end Ri according to the modulation signal of the guide frequency sequences; and the VCE calculating the crosstalk channel estimation parameters based on the error samples and the guide frequency sequence of the on-line user routes.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of crosstalk channels method of estimation, Apparatus and system.
Background technology
XDSL (DSL; Digital Subscriber Line, digital subscriber line) be a kind of at twisted pair telephone (UTP, Unshielded Twist Pair; UTP) high speed data transfer of transmission technology, the system that provides multichannel xDSL to insert is called DSL couple in multiplexer (DSLAM).Because electromagnetic induction principle between the multiple signals that DSLAM inserts, can produce each other and disturb; Be called and crosstalk, like near-end cross (NEXT) and far-end cross talk (FEXT), wherein; Near-end cross (NEXT) can not produce too big harm to the performance of system; And because the frequency range that xDSL uses is more and more wideer, far-end cross talk (FEXT) can more seriously influence the transmission performance of circuit, and (FEXT) is as shown in Figure 1 for far-end cross talk; Can make that some line speeds are low, unstable properties even can not open etc., finally cause the line activation rate of DSLAM lower.
Industry has proposed the Vectored-DSL technology at present; Mainly be utilized in the possibility that the DSLAM end carries out combined transceiving; Use method for processing signals to offset the interference of FEXT, promptly for descending, shown in Fig. 2 a; Introduce a vectorial precoder P signal at the DSLAM end and unite transmission, receive respectively at user side; For up, shown in Fig. 2 b, send respectively at user side, introduce a crosstalk counteracting device W at the DSLAM end, signal is united the reception processing, and counteracting is crosstalked.This W, P can be called the crosstalk channels estimated parameter; The process of this acquisition crosstalk channels estimated parameter is the process that crosstalk channels is estimated; In this process; Each transceiver of transmitting terminal raises system pilot frequency sequence (Pilot Sequence) at synchronizing symbol (Sync Symbol), the error sample that receiver causes by crosstalking on receiving terminal measurement synchronization symbol (Error Sample), and receiver is given VCE (Vectoring Control Entity with the error pattern delivery; The vector quantization controlled entity), VCE according to pilot frequency sequence and error sample calculation go out the crosstalk counteracting matrix W and with vectorial pre-coding matrix P.
Adopting said method to carry out crosstalk channels when estimating, be the system of 100 lines for scale in the prior art, needing length is 128 pilot sequence; Under the situation of not losing the error sample, approximately need 8.224 seconds, though the scale of this pilot sequence can be used for estimating the crosstalk channels between all circuits of this system; But according to the actual conditions of existing network, the online rate of the user in the system can not reach 100%, that is to say; Be difficult to the situation that appearance needs to estimate whole crosstalk channels in the system; This will cause following result: no matter system has 1 circuit to be in the showtime state, still 99 circuits are in the showtime state, when a new subscriber's line activates; All the pilot sequence according to total length carries out the crosstalk channels estimation; Also promptly carry out initialization according to the time of maximum, this makes the subscriber's line on-line time very long, has a strong impact on user experience.
Summary of the invention
The embodiment of the invention provides a kind of crosstalk channels method of estimation, Apparatus and system, can shorten the time that crosstalk channels is estimated.
In order to solve the problems of the technologies described above, the technical scheme of the embodiment of the invention is following:
A kind of crosstalk channels method of estimation of subscriber's line comprises:
Vector quantization controlled entity VCE generates quadrature training pilot frequency sequence matrix according to the scale of said subscriber's line;
Said VCE is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively according to said quadrature training pilot frequency sequence matrix; The pilot frequency sequence of said distribution is sent by the transmitting terminal Ti on said every the subscriber's line i that reaches the standard grade after modulating; Wherein, the pilot frequency sequence of any two circuits of reaching the standard grade in the subscriber's line is mutually orthogonal;
Said VCE receives the error sample of the receiving terminal Ri transmission of said every the subscriber's line i that reaches the standard grade, and said error sample is obtained according to the modulation signal of the pilot frequency sequence that receives by said receiving terminal Ri;
Said VCE calculates acquisition crosstalk channels estimated parameter according to the pilot frequency sequence of all error samples that received and the said subscriber's line of reaching the standard grade;
A kind of crosstalk channels estimation unit of subscriber's line comprises:
The matrix generation unit is used for generating quadrature training pilot frequency sequence matrix according to the scale of said subscriber's line;
The sequence allocation unit; Being used for according to said quadrature training pilot frequency sequence matrix is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively; The pilot frequency sequence of said distribution is sent by the transmitting terminal Ti on said every the subscriber's line i that reaches the standard grade after modulating; Wherein, the pilot frequency sequence of any two circuits of reaching the standard grade in the subscriber's line is mutually orthogonal;
The sample receiving element is used to receive the error sample that the receiving terminal Ri of said every the subscriber's line i that reaches the standard grade sends, and said error sample is obtained according to the modulation signal of the pilot frequency sequence that receives by said receiving terminal Ri;
Channel estimating unit is used for calculating acquisition crosstalk channels estimated parameter according to the pilot frequency sequence of all error samples that received and the said subscriber's line of reaching the standard grade.
A kind of crosstalk channels estimating system comprises transmitting terminal Ti and the receiving terminal Ri of VCE, every the subscriber's line i that reaches the standard grade,
Said VCE is used for generating quadrature training pilot frequency sequence matrix according to said subscriber's line madam's scale; According to said quadrature training pilot frequency sequence matrix is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively, and wherein, the pilot frequency sequence of any two circuits is mutually orthogonal in the subscriber's line of reaching the standard grade; Receive the error sample of the receiving terminal Ri transmission of said every the subscriber's line i that reaches the standard grade; Pilot frequency sequence according to all error samples that received and the said subscriber's line of reaching the standard grade calculates acquisition crosstalk channels estimated parameter;
Said transmitting terminal Ti, being used for sending said VCE to said receiving terminal Ri is the modulation signal of the pilot frequency sequence that subscriber's line i distributes of reaching the standard grade;
Said receiving terminal Ri is used for obtaining the error sample according to the modulation signal of the pilot frequency sequence that receives, and said error sample is sent to said VCE.
The embodiment of the invention generates quadrature training pilot frequency sequence matrix in advance through VCE, only is the pilot frequency sequence on user's distributed lines of reaching the standard grade according to this matrix then, and finally confirms the crosstalk channels estimated parameter according to the pilot frequency sequence on this subscriber's line of reaching the standard grade.This method is with respect to no matter how line status is the method that every subscriber's line distributes pilot frequency sequence in the prior art; Simplified the scale of the pilot frequency sequence that is used to calculate the crosstalk channels estimated parameter greatly, especially do not had not only to have reduced the Cycle Length of pilot frequency sequence under 100% situation about all activating at subscribers feeder; Shortened the transmitting time of pilot frequency sequence in the one-period scope; Also reduced the received quantity of the error sample of VCE reception, shortened receiving the time of error sample, thereby shortened the estimated time of crosstalk channels; Further shorten the time of subscriber's line activation and tracking, improved user experience.And, saved amount of calculation, alleviated the burden of CPU, saved downstream feedback passage taking to up channel.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the sketch map of far-end cross talk under the system that inserts of multichannel xDSL;
Fig. 2 a introduces vectorial precoder P at the DSLAM end to make the sketch map that combined signal sends;
Fig. 2 b introduces crosstalk counteracting device W at the DSLAM end to make the sketch map that combined signal receives;
Fig. 3 is the flow chart of a kind of crosstalk channels method of estimation of the embodiment of the invention;
Fig. 4 is the generative process sketch map of error sample in the embodiment of the invention;
Fig. 5 is the flow chart of the another kind of crosstalk channels method of estimation of the embodiment of the invention;
Fig. 6 is the sketch map of middle quadrature training pilot frequency sequence matrix embodiment illustrated in fig. 5;
Fig. 7 is the flow chart of the another kind of crosstalk channels method of estimation of the embodiment of the invention;
Fig. 8 a is that middle circuit pilot frequency sequence embodiment illustrated in fig. 7 distributes sketch map;
Fig. 8 b～8c is a line pilot sequence allocation sketch map when existing the subscriber's line of reaching the standard grade to roll off the production line in embodiment illustrated in fig. 7;
Fig. 8 d～8e is a line pilot sequence allocation sketch map when existing the subscriber's line of reaching the standard grade activating in embodiment illustrated in fig. 7;
Fig. 8 f is the sketch map of the middle pilot frequency sequence that shortens embodiment illustrated in fig. 7;
Fig. 9 is the flow chart of the another kind of crosstalk channels method of estimation of the embodiment of the invention;
Figure 10 a is the sketch map of middle quadrature training pilot frequency sequence matrix embodiment illustrated in fig. 9;
Figure 10 b is that middle circuit pilot frequency sequence embodiment illustrated in fig. 9 distributes sketch map;
Figure 10 c is the sketch map of the middle pilot frequency sequence that shortens embodiment illustrated in fig. 9;
Figure 10 d be embodiment illustrated in fig. 9 in the sketch map of pilot frequency sequence of another shortening;
Figure 11 is the structural representation of a kind of crosstalk channels estimation unit of the embodiment of the invention;
Figure 12 is the structural representation of the another kind of crosstalk channels estimation unit of the embodiment of the invention;
Figure 13 is the structural representation of a kind of crosstalk channels estimating system of the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Referring to Fig. 3, be the flow chart of a kind of crosstalk channels method of estimation of the embodiment of the invention.
This method can comprise:
In embodiments of the present invention; VCE is the controlled entity of whole Vectored DSL, and in the DSLAM like Fig. 2 a, b, VCE is at first according in system such as the vectored DSL system; The scale of subscriber's line or quantity; Generate the training pilot frequency sequence matrix of quadrature, during follow-up pilot frequency sequence on distributed lines, can train the pilot frequency sequence matrix directly to distribute based on this.Wherein, this quadrature training pilot frequency sequence can be the Walsh matrix.
When having the user to reach the standard grade in this system, being in the showtime state; VCE is not how the same no matter line status with prior art is every subscriber's line and distributes pilot frequency sequence; But adopt this step said; Just, only be the pilot frequency sequence on user's distributed lines of reaching the standard grade according to the training of the quadrature in last step pilot frequency sequence matrix, and quadrature between the pilot frequency sequence on the subscriber's line of reaching the standard grade.This method of salary distribution has multiple; Can be that element with certain delegation in this matrix is as the pilot frequency sequence on a certain circuit; Also can be with the part element in certain delegation as the pilot frequency sequence on a certain circuit; Can also be that other element of choosing in this matrix is formed the pilot frequency sequence on a certain circuit, specifically see also the description of subsequent implementation example.
At VCE is after every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence, and the transmitting terminal Ti on every circuit i can be the modulation signal that receiving terminal Ri sends pilot frequency sequence to the opposite end according to the pilot frequency sequence that distributes.Wherein, " i " represents a certain the subscriber's line of reaching the standard grade, and Ti, Ri represent transmitting terminal, the receiving terminal on this circuit respectively, and it is convenient to be merely statement, is not to refer in particular to.
For upward signal, the transmitting terminal on each circuit is each user side, sends the modulation signal of the pilot frequency sequence of mutual orthogonal thereto relation and holds to DSLAM; For downstream signal, the transmitting terminal on each circuit is at DSLAM end, and the modulation signal that sends the pilot frequency sequence that is mutually orthogonality relation through each subcarrier is to each user side.
Transmitting terminal Ti on every circuit i modulates the generation modulation signal according to the pilot frequency sequence that VCE distributes at each synchronizing symbol; Send to receiving terminal Ri then; Wherein, modulation generates the process of modulation signal to pilot frequency sequence, as pilot frequency sequence being modulated at the constellation point on the planisphere; To those skilled in the art, can realize according to foregoing description.
After transmitting terminal Ti sends the modulation signal of pilot frequency sequence; Receiving terminal Ri by on this circuit i receives; Can produce far-end cross talk between the different circuits in the process that signal transmits on the line, so possibly have certain difference between the signal that signal that receiving terminal Ri receives and transmitting terminal Ti send, receiving terminal Ri rules out the signal that transmitting terminal Ti sends according to the modulation signal of the pilot frequency sequence that receives; And calculate the reception signal and send the difference between the signal; Obtain the error sample, for example receiving terminal Ri goes out the constellation point that transmitting terminal Ti sends according to the signal decision that receives, and will receive signal and the difference of adjudicating constellation point as the error sample.
In the computational process of this error sample; Calculating for uplink and downlink error sample all can be adopted said process; For up error sample, because transmitting terminal Ti is that VTU-R also is the NMS side, receiving terminal Ri is that VTU-O is a user side; And the pilot frequency sequence that VTU-R uses to be VCE dispose to VTU-O and by VTU-O notifies VTU-R through the mode of message; Therefore the pilot frequency sequence of up transmission is known for VTU-O, thus the constellation point that also can directly use transmission point as a reference, and calculate acceptance point and the difference of sending constellation point as the error sample.Above-mentioned receiving terminal Ri to those skilled in the art, can realize according to foregoing description according to the process of the calculated signals error sample that receives.Receiving terminal Ri is sent to VCE with this error sample after calculating acquisition error sample.
Above process, as shown in Figure 4, be example with the pilot frequency sequence on two subscriber's lines of reaching the standard grade, transmitting terminal sends pilot frequency sequence modulation signal x1; X2, each receiver receive pilot frequency sequence modulation signal y1, behind the y2; According to signal y1, y2 rules out the modulation signal x1 of transmitting terminal, x2; And calculate error sample 1 respectively, error sample 2 is sent to VCE.
VCE calculates the crosstalk channels estimated parameter according to error sample that receives and the pilot frequency sequence on each circuit; As the crosstalk counteracting matrix W and with vectorial pre-coding matrix P; After obtaining W and P; W and P adjustment crosstalk counteracting device and vectorial precoder that DALAM end can be confirmed according to VCE to the up-downgoing Combined Treatment, reach the effect of elimination far-end cross talk through crosstalk counteracting device and vectorial precoder.Wherein, the process for VCE calculates crosstalk channels estimated parameters such as W, P according to error sample and pilot frequency sequence for a person skilled in the art, can realize according to foregoing description.
The embodiment of the invention generates quadrature training pilot frequency sequence matrix in advance through VCE, only is the pilot frequency sequence on user's distributed lines of reaching the standard grade according to this matrix then, and finally confirms the crosstalk channels estimated parameter according to the pilot frequency sequence on this subscriber's line of reaching the standard grade.This method is with respect to no matter how line status is the method that every subscriber's line distributes pilot frequency sequence in the prior art; Simplified the scale of the pilot frequency sequence that is used to calculate the crosstalk channels estimated parameter greatly, especially do not had not only to have reduced the Cycle Length of pilot frequency sequence under 100% situation about all activating at subscribers feeder; Shortened the transmitting time of pilot frequency sequence in the one-period scope; Also reduced the received quantity of the error sample of VCE reception, shortened receiving the time of error sample, thereby shortened the estimated time of crosstalk channels; Further shorten the time of subscriber's line activation and tracking, improved user experience.And, saved amount of calculation, alleviated the burden of CPU, saved downstream feedback passage taking to up channel.
Referring to Fig. 5, be the flow chart of the another kind of crosstalk channels method of estimation of the embodiment of the invention.
This method can comprise:
For example; The subscriber's line scale of vectored DSL system is 24 pairs of lines; Then VCE can the generation scale be the Walsh matrix of M * M; As shown in Figure 6; Wherein, M is
(if the first row contains vacant line in this matrix is not assigned with and takies) perhaps
(first trip of this matrix is participated in the distribution), and N is 24.Need to prove that in all described methods of this paper, the provisional capital of matrix is from 0 open numbering, promptly first row contains the 0th is gone.
VCE only is the pilot frequency sequence on user's distributed lines of reaching the standard grade in this step; Be that example describes with the element of choosing certain delegation in the quadrature training pilot frequency sequence matrix as the pilot frequency sequence on a certain circuit in the present embodiment; For example circuit 2 is reached the standard grade and promptly is in the showtime state, then can select the 1st row element in the quadrature training pilot frequency sequence matrix as the pilot frequency sequence on this circuit.
When existing many to reach the standard grade circuit, concrete for the method for lane assignment pilot frequency sequence have multiple, for example:
VCE trains row in the pilot frequency sequence matrix as pilot frequency sequence quadrature according to the user's that reaches the standard grade the order of reaching the standard grade successively, is dispensed on every the subscriber's line i that reaches the standard grade; Perhaps,
VCE trains the corresponding row of pilot frequency sequence matrix middle-end slogan as pilot frequency sequence quadrature according to the user's that reaches the standard grade port numbers, is dispensed on the corresponding user's that reaches the standard grade of this port numbers the circuit, and wherein, port numbers is corresponding one by one with the line number in this matrix.
Further,, quadrature is trained the pilot frequency sequence that uses in the pilot frequency sequence matrix on the maximum circuit of line number, be replaced by the minimum pilot frequency sequence of line number that is not used in the quadrature training pilot frequency sequence matrix when existence is reached the standard grade subscriber's line when rolling off the production line;
When existence is reached the standard grade subscriber's line when activating; Train the row that is not used in the pilot frequency sequence matrix to be dispensed on the circuit that is activating as pilot frequency sequence quadrature; And make between the pilot frequency sequence that is distributed on every circuit that is activating quadrature on part rows, preferably make between the pilot frequency sequence that is distributed on every circuit that is activating at the minimum quadrature that lists.For example; Quadrature trained the less pilot frequency sequence of line number is dispensed on the circuit that is activating in the pilot frequency sequence matrix; And train the minimum pilot frequency sequence of the line number that is not used in the pilot frequency sequence matrix as new pilot frequency sequence the quadrature, reassign on the circuit that uses the less pilot frequency sequence of line number.
The specific embodiment of above-mentioned assigning process is please with reference to subsequent descriptions.This step can directly be carried out and above-mentioned steps 303,304 identical operations after accomplishing, and also can continue to carry out following steps 503～505.
In the present embodiment; After VCE is each lane assignment pilot frequency sequence; Can also be further in the pilot frequency sequence that distributes the selected part pilot frequency sequence simplify the process of subsequent calculations error sample and shorten the time that obtains error sample and W, P with the scale of each pilot frequency sequence of shortening transmitting terminal and sending.Need satisfy orthogonality between the pilot frequency sequence of the shortening on each circuit.
The detailed process of selected part pilot frequency sequence can be: one section continuous pilot frequency sequence of columns of intercepting in the pilot frequency sequence of every the subscriber's line of reaching the standard grade, as the pilot frequency sequence that shortens; Perhaps, in the pilot frequency sequence of every the subscriber's line of reaching the standard grade, select the discontinuous pilot frequency sequence of columns, as pilot frequency sequence that shortens or the like.In a word, as long as satisfy quadrature between the pilot frequency sequence that shortens.
Behind the pilot frequency sequence that shortens on definite subscriber's line of respectively reaching the standard grade; The transmitting terminal on the subscriber's line of respectively reaching the standard grade can send the modulation signal of the pilot frequency sequence of this shortening; Behind the modulation signal of the pilot frequency sequence after receiving terminal receives and crosstalks, calculate corresponding error sample, and be sent to VCE.
Because the pilot frequency sequence of the modulation signal institute foundation that transmitting terminal sends is the sequence after shortening, the error sample that receiving terminal calculates also promptly with the pairing error sample of the pilot frequency sequence of this shortening.Corresponding description in the method for this error of calculation sample and the abovementioned steps 303 is similar, and the modulation signal of the pilot frequency sequence that just receives is different, repeats no more here.
In another embodiment, VCE can also further confirm to receive the start-stop position of error sample when receiving the error sample, to receive shorter error sample, simplify the computational process of next step.
It is similar that this calculates the method and the abovementioned steps 304 that obtain the crosstalk channels estimated parameter, and the pilot frequency sequence that just calculates institute's foundation is different, repeats no more here.
The embodiment of the invention has further shortened the pilot frequency sequence on each circuit with respect to previous embodiment; Reduce the Cycle Length of pilot frequency sequence more, shortened the transmitting time of pilot frequency sequence in the one-period scope, also more reduced the received quantity of the error sample of VCE reception; Shortened the time that receives the error sample; Thereby shortened the estimated time of crosstalk channels more, further shortened the time of subscriber's line activation and tracking, improved user experience.
Referring to Fig. 7, be the flow chart of the another kind of crosstalk channels method of estimation of the embodiment of the invention.
This method can comprise:
Step 701 in the VCE initialization procedure, generates the quadrature training sequence matrix according to vectored DSL system scale.
Be that 24 pairs of lines are example still in the present embodiment with vectored DSL system scale; Then VCE can the generation scale be the Walsh matrix of M * M; As shown in Figure 6; Wherein, M is
(if this matrix in the first row contains vacant line, be not assigned with and take) perhaps
N be 24.The quadrature training sequence matrix is that example describes with 32 * 32 Walsh matrix in the present embodiment.
Suppose circuit 4,23,12,9 reach the standard grade successively, train in the pilot frequency sequence matrix 1～4 row to distribute to 4,23,12,9 circuits successively according to the line activation order quadrature, and shown in Fig. 8 a, wherein, first trip (the 0th row among the figure) keeps.
When existence is reached the standard grade subscriber's line when rolling off the production line, quadrature is trained the pilot frequency sequence that uses in the pilot frequency sequence matrix on the maximum circuit of line number, be replaced by the minimum pilot frequency sequence of line number that is not used in the quadrature training pilot frequency sequence matrix.
For example circuit 23 rolls off the production line, then with the better pilot frequency sequence for the line number that is not used minimum (the 2nd row) of the pilot frequency sequence on the circuit 9 of line number maximum (the 4th row), shown in Fig. 8 b～8c.
When existence is reached the standard grade subscriber's line when activating; Train the row that is not used in the pilot frequency sequence matrix to be dispensed on the circuit that is activating quadrature, and make the pilot frequency sequence that is distributed on every circuit that is activating satisfy orthogonality in minimum listing as pilot frequency sequence.For example; Quadrature trained the less pilot frequency sequence of line number is dispensed on the circuit that is activating in the pilot frequency sequence matrix, and train the minimum pilot frequency sequence of line number that is not used in the pilot frequency sequence matrix to reassign on the circuit that uses the less pilot frequency sequence of line number quadrature as new pilot frequency sequence.
For example, circuit 4,23,12; 9 is the showtime status line, and circuit 11 and 5 is activating, before circuit 11 and 5 activates; Train the row of the 1st～4 in the pilot frequency sequence matrix to distribute to 4,23,12 successively quadrature according to the line activation order; 9 circuits, first trip (the 0th row) keeps, when circuit 11 and 5 is activating; Then the 1st～2 row is distributed to the circuit 11 and 5 that is activating successively, and minimum pilot frequency sequence the 5th～6 row of the line number that will not be used reassigns on the circuit 4,23 that uses the less pilot frequency sequence of line number as new pilot frequency sequence; Also be about to the uppermost row of matrix and be dispensed to the circuit that is activating, the pilot frequency sequence of existing showtime circuit is replaced with the minimum pilot frequency sequence of the line number that is not used in the matrix, shown in Fig. 8 d～8e.
This step can directly be carried out and above-mentioned steps 303,304 identical operations after accomplishing, and also can continue to carry out following steps 703～705.
The line number of the pilot frequency sequence of the maximum that has been used in the supposing the system is l; Because the special nature of Walsh Matrix; (the 0th row keeps) or
just can guarantee orthogonality to use
; Follow-up VCE calculate number that W and P institute be listed as in should the error sample of foundation for
(the 0th row keeps) or
suppose that the selected respectively begin column position of the pilot frequency sequence of shortening is start; Then according to the begin column position start of each pilot frequency sequence; Each continuous pilot frequency sequence of one section columns that can obtain the intercepting of VCE institute is that columns is from start to
or to the pilot frequency sequence
, shown in Fig. 8 f.Wherein, the position of start can be selected arbitrarily in the matrix column number as required, does not do qualification here.
In the present embodiment, the line number of the pilot frequency sequence of the maximum that has been used is that l is 4, and then each pilot frequency sequence of institute's intercepting is quadrature training pilot frequency sequence midrange each pilot frequency sequence between from start to start+3.
Behind the pilot frequency sequence that shortens on definite subscriber's line of respectively reaching the standard grade; The transmitting terminal on the subscriber's line of respectively reaching the standard grade can send the modulation signal of the pilot frequency sequence of this shortening; Behind the modulation signal of the pilot frequency sequence after receiving terminal receives and crosstalks, calculate corresponding error sample, and be sent to VCE.
In the present embodiment; The error sample that VCE receives is that line number is the 1st～4 row in the orthogonal pilot frequency sequence shown in Figure 6 that the receiving terminal receiving end/sending end sends, the error sample that columns obtains for the modulation signal of the pilot frequency sequence on pairing four circuits from start to start+3.VCE carries out next step after confirming to collect this error sample.
The embodiment of the invention has been simplified the scale of the pilot frequency sequence that is used to calculate the crosstalk channels estimated parameter greatly; Especially do not have under 100% whole situation about activating at subscribers feeder; Not only reduce the Cycle Length of pilot frequency sequence, shortened the transmitting time of pilot frequency sequence in the one-period scope, also reduced the received quantity of the error sample of VCE reception; Shortened the time that receives the error sample; Thereby shortened the estimated time of crosstalk channels, further shortened the time of subscriber's line activation and tracking, improved user experience.And, saved amount of calculation, alleviated the burden of CPU, saved downstream feedback passage taking to up channel.
Referring to Fig. 9, be the flow chart of the another kind of crosstalk channels method of estimation of the embodiment of the invention.
This method can comprise:
Step 901 in the VCE initialization procedure, generates the quadrature training sequence matrix according to vectored DSL system scale.
Be that example describes still in the present embodiment with quadrature training pilot frequency sequence shown in Figure 6.
Port numbers is corresponding one by one with the line number in this matrix, shown in Figure 10 a.
If the subscriber's line of reaching the standard grade in the current system is 5 and 8, then according to the row of line scan pickup coil side slogan 5,8 correspondences, the pilot frequency sequence that circuit 5,8 uses is respectively row of the 4th in the matrix shown in Figure 6 and the 7th row, shown in Figure 10 b.Reach the standard grade subscriber's line when rolling off the production line or reaching the standard grade the situation that the user activating when existence, also can adopt mode identical in the abovementioned steps 702 to adjust the user's that respectively reaches the standard grade pilot frequency sequence.
This step can directly be carried out and above-mentioned steps 303,304 identical operations after accomplishing, and also can continue to carry out following steps 903～905.
In the present embodiment; The process of confirming the pilot frequency sequence of this shortening can be: the row of the minimum and maximum matrix that the pilot frequency sequence that binary representation uses is corresponding number; (order from right to left) compares two binary numbers from low level to high position order then; Confirm numeral the highest unequal position x, the corresponding columns in quadrature training pilot tone ordered series of numbers matrix of the pilot frequency sequence on each circuit that then shortens is 2
x,, then stop columns and be start+2 if initial columns is start
x-1.Wherein, the position of start can be selected arbitrarily in the matrix column number as required, does not do qualification here.This method goes for an embodiment equally, and this step always can use the method among the embodiment to confirm the pilot frequency sequence that shortens too.As long as satisfy orthogonality relation between the pilot frequency sequence that shortens.
For example, in the present embodiment, the binary number of the 4th row is that the binary number of 0000000000000100, the 7 row is 0000000000000111, and then finding the highest not equipotential x of two binary numbers is the 2nd, and the columns that the pilot frequency sequence that then shortens is corresponding is 2
xPromptly 4.Each pilot frequency sequence that then shortens is shown in Figure 10 c, and for line number is the 4th, 7 row, columns is a pairing pilot frequency sequence from start to start+3.
In another embodiment of the present invention, select the discontinuous pilot frequency sequence of columns in the pilot frequency sequence that VCE can also distribute on the subscriber's line of respectively reaching the standard grade, as the pilot frequency sequence that shortens.Satisfy orthogonality between the pilot frequency sequence that shortens.
For example; The use line number is 4 and 7 pilot frequency sequence in the current system, and VCE can the selection matrix midrange be the pilot frequency sequence of k1, K2, forms the pilot frequency sequence that shortens; Wherein k1 and k2 are discontinuous; But each pilot frequency sequence of the shortening of being made up of the element of the element of the 4th row k1, k2 row and the 7th row k1, k2 row satisfies orthogonality, also is that line number is that 4 and 7 pilot frequency sequence is at k1 and k2 point quadrature, shown in Figure 10 d.This method goes for an embodiment equally, and this step always can use the method among the embodiment to confirm the pilot frequency sequence that shortens too.As long as satisfy orthogonality relation between the pilot frequency sequence that shortens.
Behind the pilot frequency sequence that shortens on definite subscriber's line of respectively reaching the standard grade; The transmitting terminal on the subscriber's line of respectively reaching the standard grade can send the modulation signal of the pilot frequency sequence of this shortening; Behind the modulation signal of the pilot frequency sequence after receiving terminal receives and crosstalks, calculate corresponding error sample, and be sent to VCE.
In the present embodiment, the error sample that VCE receives is the modulation signal that transmitting terminal sends the pilot frequency sequence shown in Figure 10 c, and receiving terminal calculates the error sample that obtains after receiving signal.VCE carries out next step after confirming to collect this error sample.
The embodiment of the invention has been simplified the scale of the pilot frequency sequence that is used to calculate the crosstalk channels estimated parameter greatly; Especially do not have under 100% whole situation about activating at subscribers feeder; Not only reduce the Cycle Length of pilot frequency sequence, shortened the transmitting time of pilot frequency sequence in the one-period scope, also reduced the received quantity of the error sample of VCE reception; Shortened the time that receives the error sample; Thereby shortened the estimated time of crosstalk channels, further shortened the time of subscriber's line activation and tracking, improved user experience.And, saved amount of calculation, alleviated the burden of CPU, saved downstream feedback passage taking to up channel.
In another embodiment of the present invention; No matter whether the pilot frequency sequence of the transmitting terminal modulation signal institute foundation of sending is the pilot frequency sequence that shortens; When VCE receives the error sample; Can also carry out following steps,, simplify the process of VCE subsequent calculations crosstalk channels estimated parameter to receive shorter error sample.Concrete can comprise:
VCE confirms the original position and the final position of the error sample that all receiving terminals send, and is mutually orthogonal between the pilot frequency sequence that the pairing transmitting terminal of all the error samples between said original position and the final position uses; Wherein, Error sample between said original position and the final position can be continuous; No matter also can be discontinuous, be continuous or discontinuous, as long as guarantee between the pilot frequency sequence that these error sample corresponding sending terminal use mutually orthogonal.
Receive all the error samples between said original position and the said final position.
Wherein, When confirming the original position of the error sample that each receiving terminal sends; Can be earlier confirm in each error sample position start (original position) at the beginning arbitrarily; Confirm the final position end (final position) of each error sample then, and guarantee that each the error sample between this initial and final position is mutually orthogonal between the pilot frequency sequence of corresponding sending terminal respectively.
Concrete; Suppose that each error sample standard deviation receives since the start row; Then corresponding to the pilot frequency sequence of each transmitting terminal; If the line number of pilot frequency sequence is 1～l or 0～l-1 in the quadrature that the uses training pilot frequency sequence matrix; Because the special nature of Walsh Matrix; (the 0th row keeps) or
individual row just can guarantee the orthogonality of pilot frequency sequence to use
; Shown in Fig. 8 f, this moment, the termination columns of each error sample also was that each error sample that
or
also promptly receives is columns from start to
or the continuous error sample
.
Can also be; Suppose that each error sample standard deviation receives since the start row; Then corresponding to the pilot frequency sequence of each transmitting terminal, the row of the minimum and maximum matrix that the pilot frequency sequence that uses with binary representation is corresponding (quadrature training pilot frequency sequence matrix) number, (order from right to left) two binary numbers relatively then from low level to high position order; Confirm numeral the highest unequal position x, the columns that then satisfies the pilot frequency sequence of quadrature just can be 2
xRow, shown in Figure 10 c, then the termination columns of each error sample also is 2 at this moment
x, each the error sample that also promptly receives is columns from start to start+2
xContinuous error sample between-1.
Also can also be, VCE selects discontinuous columns and receives in each error sample, but quadrature between the pilot frequency sequence of each transmitting terminal of these columns correspondences of needs assurance.
Certainly, the method that VCE confirm to receive error sample original position and final position has multiple, as long as make between the pilot frequency sequence that pairing each transmitting terminal of each error sample between start-stop position and the final position uses mutually orthogonal.Be merely for example with upper type, do not do concrete qualification here.
More than each embodiment be merely and illustrate; And it is non-limiting; Wherein, Can select and be combined to form new technical scheme respectively for the user that reaches the standard grade distributes the several different methods of pilot frequency sequence, the several different methods that pilot frequency sequence is shortened in acquisition, the several different methods that receives the error sample that shortens etc., not enumerate one by one here.More than be description, introduce in the face of the device of realizing said method down the inventive method embodiment.
Referring to Figure 11, be the structural representation of a kind of crosstalk channels estimation unit of the embodiment of the invention.
This device can be VCE, can comprise:
Sample receiving element 1103 is used to receive the error sample that the receiving terminal Ri of said every the subscriber's line i that reaches the standard grade sends, and said error sample is obtained according to the modulation signal of the pilot frequency sequence that receives by said receiving terminal Ri;
Matrix generation unit 1101 generates the training pilot frequency sequence matrix of quadrature at first according to the subscriber's line scale of system such as vectored DSL system, and this quadrature training pilot frequency sequence can be the Walsh matrix.When having the user to reach the standard grade in this system, being in the showtime state, 1102 of sequence allocation unit are the pilot frequency sequence on user's distributed lines of reaching the standard grade, and satisfy orthogonality between the pilot frequency sequence on the subscriber's line of reaching the standard grade.This method of salary distribution has multiple; Can be that element with certain delegation in this matrix is as the pilot frequency sequence on a certain circuit; Can also be that other element of choosing in this matrix is formed pilot frequency sequence on a certain circuit etc. also with the part element in certain delegation as the pilot frequency sequence on a certain circuit.After the transmitting terminal Ti on the subscriber's line i of respectively reaching the standard grade sends the modulation signal of pilot frequency sequence; Receiving terminal Ri by on the circuit receives; Behind the modulation signal calculating reception signal and the difference between the transmission signal of receiving terminal Ri according to the pilot frequency sequence that receives; Obtain the error sample; This error sample is sent to sample receiving element 1103, and channel estimating unit 1104 is calculated the crosstalk channels estimated parameter according to error sample and the pilot frequency sequence on the circuit that each receiving terminal that receives sends, as the crosstalk counteracting matrix W and with vectorial pre-coding matrix P.After obtaining W and P, the DALAM end can be adjusted crosstalk counteracting device and vectorial precoder with P according to the W that VCE confirms, to the up-downgoing Combined Treatment, reaches the effect of elimination far-end cross talk through crosstalk counteracting device and vectorial precoder.
The embodiment of the invention has been simplified the scale of the pilot frequency sequence that is used to calculate the crosstalk channels estimated parameter greatly through said units; Especially do not have under 100% whole situation about activating at subscribers feeder; Not only reduce the Cycle Length of pilot frequency sequence, shortened the transmitting time of pilot frequency sequence in the one-period scope, also reduced the received quantity of the error sample of VCE reception; Shortened the time that receives the error sample; Thereby shortened the estimated time of crosstalk channels, further shortened the time of subscriber's line activation and tracking, improved user experience.And, saved amount of calculation, alleviated the burden of CPU, saved downstream feedback passage taking to up channel.
Referring to Figure 12, be the structural representation of the another kind of crosstalk channels estimation unit of the embodiment of the invention.
This device can be VCE, except can comprising matrix generation unit 1201, and sequence allocation unit 1202, sample receiving element 1203 outside the channel estimating unit 1204, can also comprise that sequence chooses unit 1205.Wherein, matrix generation unit 1201, channel estimating unit 1204 respectively with last embodiment in matrix generation unit 1101, channel estimating unit 1104 is similar, repeats no more here.
In the present embodiment, sequence allocation unit 1202, specifically can according to the user that reaches the standard grade reach the standard grade order successively with the row in the said quadrature training pilot frequency sequence matrix as pilot frequency sequence, be dispensed on every the subscriber's line i that reaches the standard grade; Can also be used for training the corresponding row of port numbers described in the pilot frequency sequence matrix as pilot frequency sequence said quadrature, be dispensed on the corresponding subscriber's line of reaching the standard grade of said port numbers according to the user's that reaches the standard grade port numbers.
The first adjustment subelement 12021; Be used for when existing the subscriber's line of reaching the standard grade to roll off the production line; With using the pilot frequency sequence on the maximum circuit of line number in the said quadrature training pilot frequency sequence matrix, be replaced by the minimum pilot frequency sequence of line number that is not used in the said quadrature training pilot frequency sequence matrix.
The second adjustment subelement 12022; Be used for when existing the subscriber's line of reaching the standard grade activating; The row that is not used in the said quadrature training pilot frequency sequence matrix is dispensed on the circuit that is activating as pilot frequency sequence, and makes between the pilot frequency sequence on every circuit that is activating at the minimum quadrature that lists.The second adjustment subelement 12022; Concrete can being used for is dispensed to the said circuit that is activating with the less pilot frequency sequence of said quadrature training pilot frequency sequence matrix line number; And the pilot frequency sequence of the line number that will not be used minimum reassigns on the circuit that uses the less pilot frequency sequence of said line number as new pilot frequency sequence.
Sequence is chosen unit 1205; Being used for according to said quadrature training pilot frequency sequence matrix is that the user that reaches the standard grade distributes after the pilot frequency sequence on each said subscriber's line of reaching the standard grade; In the pilot frequency sequence of said every the subscriber's line i that reaches the standard grade, the selected part pilot frequency sequence is as the pilot frequency sequence that shortens, so that said transmitting terminal Ti sends the modulation signal of the pilot frequency sequence of said shortening; Wherein, quadrature between the pilot frequency sequence of any two said shortenings.Sequence is chosen unit 1205, and concrete can be used for the pilot frequency sequence at said every the subscriber's line i that reaches the standard grade, and one section continuous pilot frequency sequence of columns of intercepting is as the pilot frequency sequence of said shortening; Perhaps, in the pilot frequency sequence of said every the subscriber's line of reaching the standard grade, select the discontinuous pilot frequency sequence of columns, as the pilot frequency sequence of said shortening.
Sample receiving element 1203 can comprise:
Receive subelement 12032, be used to receive all the error samples between said original position and the said final position.
After matrix generation unit 1101 generates the training pilot frequency sequence matrix of quadrature according to system scale; Sequence allocation unit 1202 trains row in the pilot frequency sequence matrix as pilot frequency sequence quadrature according to the said user's of reaching the standard grade the reach the standard grade order or the user's that reaches the standard grade port numbers; Be dispensed on the user's that reaches the standard grade the circuit; And respectively the subscriber's line of reaching the standard grade roll off the production line and the reach the standard grade situation of subscriber's line activation is distributed adjustment through the first adjustment subelement 12021 and the second adjustment subelement 12022; Choose unit 1205 on the pilot frequency sequence that distributes by sequence then; The selected part pilot frequency sequence is as the pilot frequency sequence that shortens, and sends the modulation signal of the pilot frequency sequence of this shortening by transmitting terminal, after receiving terminal calculates the difference that receives between signal and the transmission signal according to the modulation signal of the pilot frequency sequence that receives; Obtain the error sample; This error sample is sent to sample receiving element 1203, confirms subelement 12031 definite original position and final positions that receive the error sample, receive the error sample that subelement 12032 receives these shortenings by the position; Last calculate the crosstalk channels estimated parameter by channel estimating unit 1204 according to the error sample and the pilot frequency sequence on each circuit of the shortening that receives again, as the crosstalk counteracting matrix W and with vectorial pre-coding matrix P.
The embodiment of the invention has been simplified the scale of the pilot frequency sequence that is used to calculate the crosstalk channels estimated parameter greatly; Especially do not have under 100% whole situation about activating at subscribers feeder; Not only reduce the Cycle Length of pilot frequency sequence, shortened the transmitting time of pilot frequency sequence in the one-period scope, also reduced the received quantity of the error sample of VCE reception; Shortened the time that receives the error sample; Thereby shortened the estimated time of crosstalk channels, further shortened the time of subscriber's line activation and tracking, improved user experience.And, saved amount of calculation, alleviated the burden of CPU, saved downstream feedback passage taking to up channel.
Referring to Figure 13, be the structural representation of a kind of crosstalk channels estimating system of the embodiment of the invention.
This system can comprise VCE 1301, at least two subscriber's lines of reaching the standard grade, the transmitting terminal Ti 1302 of every the subscriber's line i that reaches the standard grade and receiving terminal Ri 1303.
VCE1301 is used for generating quadrature training pilot frequency sequence matrix according to the subscriber's line scale; According to said quadrature training pilot frequency sequence matrix is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence, and wherein, the pilot frequency sequence of any two circuits is mutually orthogonal in the subscriber's line of reaching the standard grade; Receive the error sample of receiving terminal Ri 1303 transmissions of said every the subscriber's line i that reaches the standard grade; Pilot frequency sequence according to said error sample and the said subscriber's line of reaching the standard grade calculates acquisition crosstalk channels estimated parameter;
Transmitting terminal Ti 1302, being used for sending said VCE to said receiving terminal Ri 1303 is the modulation signal of the pilot frequency sequence that subscriber's line i distributes of reaching the standard grade;
Receiving terminal Ri 1303 is used for obtaining the error sample according to the modulation signal of the pilot frequency sequence that receives, and said error sample is sent to said VCE.
The embodiment of the invention has been simplified the scale of the pilot frequency sequence that is used to calculate the crosstalk channels estimated parameter greatly; Especially do not have under 100% whole situation about activating at subscribers feeder; Not only reduce the Cycle Length of pilot frequency sequence, shortened the transmitting time of pilot frequency sequence in the one-period scope, also reduced the received quantity of the error sample of VCE reception; Shortened the time that receives the error sample; Thereby shortened the estimated time of crosstalk channels, further shortened the time of subscriber's line activation and tracking, improved user experience.And, saved amount of calculation, alleviated the burden of CPU, saved downstream feedback passage taking to up channel.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection range of the present invention.
Claims (15)
1. the crosstalk channels method of estimation of a subscriber's line is characterized in that, comprising:
The vector quantization controlled entity generates quadrature training pilot frequency sequence matrix according to the scale of said subscriber's line;
Said vector quantization controlled entity is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively according to said quadrature training pilot frequency sequence matrix; The pilot frequency sequence of said distribution is sent by the transmitting terminal Ti on said every the subscriber's line i that reaches the standard grade after modulating; Wherein, the pilot frequency sequence of any two circuits of reaching the standard grade in the subscriber's line is mutually orthogonal;
Said vector quantization controlled entity receives the error sample of the receiving terminal Ri transmission of said every the subscriber's line i that reaches the standard grade, and said error sample is obtained according to the modulation signal of the pilot frequency sequence that receives by said receiving terminal Ri;
Said vector quantization controlled entity calculates acquisition crosstalk channels estimated parameter according to the pilot frequency sequence of all error samples that received and the said subscriber's line of reaching the standard grade.
2. method according to claim 1 is characterized in that, said vector quantization controlled entity is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively according to said quadrature training pilot frequency sequence matrix, comprising:
Said vector quantization controlled entity according to the user that reaches the standard grade reach the standard grade order successively with the row in the said quadrature training pilot frequency sequence matrix as pilot frequency sequence, be dispensed on every the subscriber's line i that reaches the standard grade; Perhaps,
Said vector quantization controlled entity trains the corresponding row of port numbers described in the pilot frequency sequence matrix as pilot frequency sequence said quadrature according to the user's that reaches the standard grade port numbers, is dispensed on the corresponding subscriber's line of reaching the standard grade of said port numbers.
3. method according to claim 2 is characterized in that, said vector quantization controlled entity is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively according to said quadrature training pilot frequency sequence matrix, also comprises:
When existence is reached the standard grade subscriber's line when rolling off the production line,, be replaced by the minimum pilot frequency sequence of line number that is not used in the said quadrature training pilot frequency sequence matrix with using the pilot frequency sequence on the maximum circuit of line number in the said quadrature training pilot frequency sequence matrix;
When existence is reached the standard grade subscriber's line when activating; The row that is not used in the said quadrature training pilot frequency sequence matrix is dispensed on the circuit that is activating as pilot frequency sequence, and makes between the pilot frequency sequence on any two circuits that activating at the minimum quadrature that lists.
4. method according to claim 3 is characterized in that, said the row that is not used in the said quadrature training pilot frequency sequence matrix is dispensed on the circuit that is activating as pilot frequency sequence, comprising:
The less pilot frequency sequence of line number in the said quadrature training pilot frequency sequence matrix is dispensed on the said circuit that is activating; And the pilot frequency sequence of the line number that will not be used minimum reassigns on the circuit that uses the less pilot frequency sequence of said line number as new pilot frequency sequence.
5. according to any described method in the claim 1 to 4, it is characterized in that said vector quantization controlled entity is that every the subscriber's line i that reaches the standard grade distributes respectively after the pilot frequency sequence according to said quadrature training pilot frequency sequence matrix, also comprises:
Said vector quantization controlled entity is in the pilot frequency sequence of said every the subscriber's line i that reaches the standard grade; The selected part pilot frequency sequence is as the pilot frequency sequence that shortens; So that said transmitting terminal Ti sends the modulation signal of the pilot frequency sequence of said shortening, wherein, quadrature between the pilot frequency sequence of any two said shortenings.
6. method according to claim 5 is characterized in that, said vector quantization controlled entity is in the pilot frequency sequence of said every the subscriber's line i that reaches the standard grade, and the selected part pilot frequency sequence comprises as the pilot frequency sequence that shortens:
In the pilot frequency sequence of said every the subscriber's line i that reaches the standard grade, one section continuous pilot frequency sequence of columns of intercepting is as the pilot frequency sequence of said shortening; Perhaps,
In the pilot frequency sequence of said every the subscriber's line of reaching the standard grade, select the discontinuous pilot frequency sequence of columns, as the pilot frequency sequence of said shortening.
7. according to any described method in the claim 1 to 6, it is characterized in that said vector quantization controlled entity receives the error sample that the receiving terminal Ri on said every the subscriber's line i that reaches the standard grade sends, and comprising:
Confirm the original position and the final position of the error sample that all receiving terminals send, mutually orthogonal between the pilot frequency sequence that the pairing transmitting terminal of all the error samples between said original position and the final position uses;
Receive all the error samples between said original position and the said final position.
8. the crosstalk channels estimation unit of a subscriber's line is characterized in that, comprising:
The matrix generation unit is used for generating quadrature training pilot frequency sequence matrix according to the scale of said subscriber's line;
The sequence allocation unit; Being used for according to said quadrature training pilot frequency sequence matrix is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively; The pilot frequency sequence of said distribution is sent by the transmitting terminal Ti on said every the subscriber's line i that reaches the standard grade after modulating; Wherein, the pilot frequency sequence of any two circuits of reaching the standard grade in the subscriber's line is mutually orthogonal;
The sample receiving element is used to receive the error sample that the receiving terminal Ri of said every the subscriber's line i that reaches the standard grade sends, and said error sample is obtained according to the modulation signal of the pilot frequency sequence that receives by said receiving terminal Ri;
Channel estimating unit is used for calculating acquisition crosstalk channels estimated parameter according to the pilot frequency sequence of all error samples that received and the said subscriber's line of reaching the standard grade.
9. device according to claim 8 is characterized in that,
Said sequence allocation unit, specifically be used for according to the user that reaches the standard grade reach the standard grade order successively with the row of said quadrature training pilot frequency sequence matrix as pilot frequency sequence, be dispensed on every the subscriber's line i that reaches the standard grade; Perhaps, train the corresponding row of port numbers described in the pilot frequency sequence matrix as pilot frequency sequence said quadrature, be dispensed on the corresponding subscriber's line of reaching the standard grade of said port numbers according to the user's that reaches the standard grade port numbers.
10. device according to claim 9 is characterized in that, said sequence allocation unit also comprises:
The first adjustment subelement; Be used for when existing the subscriber's line of reaching the standard grade to roll off the production line; With using the pilot frequency sequence on the maximum circuit of line number in the said quadrature training pilot frequency sequence matrix, be replaced by the minimum pilot frequency sequence of line number that is not used in the said quadrature training pilot frequency sequence matrix;
The second adjustment subelement; Be used for when existing the subscriber's line of reaching the standard grade activating; The row that is not used in the said quadrature training pilot frequency sequence matrix is dispensed on the circuit that is activating as pilot frequency sequence, and makes between the pilot frequency sequence on any two circuits that activating at the minimum quadrature that lists.
11. device according to claim 10 is characterized in that,
The said second adjustment subelement; Specifically be used for the less pilot frequency sequence of said quadrature training pilot frequency sequence matrix line number is dispensed to the said circuit that is activating; And the pilot frequency sequence of the line number that will not be used minimum reassigns on the circuit that uses the less pilot frequency sequence of said line number as new pilot frequency sequence.
12. any described device in 11 is characterized in that according to Claim 8, also comprises:
Sequence is chosen the unit; Be used for the pilot frequency sequence at said every the subscriber's line i that reaches the standard grade, the selected part pilot frequency sequence is as the pilot frequency sequence that shortens, so that said transmitting terminal Ti sends the modulation signal of the pilot frequency sequence of said shortening; Wherein, quadrature between the pilot frequency sequence of any two said shortenings.
13. device according to claim 12 is characterized in that,
Said sequence is chosen the unit, specifically is used for the pilot frequency sequence at said every the subscriber's line i that reaches the standard grade, and one section continuous pilot frequency sequence of columns of intercepting is as the pilot frequency sequence of said shortening; Perhaps, in the pilot frequency sequence of said every the subscriber's line of reaching the standard grade, select the discontinuous pilot frequency sequence of columns, as the pilot frequency sequence of said shortening.
14. any described device in 13 according to Claim 8 is characterized in that said sample receiving element comprises:
Subelement is confirmed in the position, is used for the original position and the final position of the error sample of definite all receiving terminals transmissions, and is mutually orthogonal between the pilot frequency sequence that the pairing transmitting terminal of all the error samples between said original position and the final position uses;
Receive subelement, be used to receive all the error samples between said original position and the said final position.
15. a crosstalk channels estimating system is characterized in that, comprises the vector quantization controlled entity, at least two subscriber's lines of reaching the standard grade, and the transmitting terminal Ti of every the subscriber's line i that reaches the standard grade and receiving terminal Ri,
Said vector quantization controlled entity is used for generating quadrature training pilot frequency sequence matrix according to the scale of said subscriber's line; According to said quadrature training pilot frequency sequence matrix is that every the subscriber's line i that reaches the standard grade distributes pilot frequency sequence respectively, and wherein, the pilot frequency sequence of any two circuits is mutually orthogonal in the subscriber's line of reaching the standard grade; Receive the error sample of the receiving terminal Ri transmission of said every the subscriber's line i that reaches the standard grade; Pilot frequency sequence according to all error samples that received and the said subscriber's line of reaching the standard grade calculates acquisition crosstalk channels estimated parameter;
Said transmitting terminal Ti, being used for sending said vector quantization controlled entity to said receiving terminal Ri is the modulation signal of the pilot frequency sequence that subscriber's line i distributes of reaching the standard grade;
Said receiving terminal Ri is used for obtaining the error sample according to the modulation signal of the pilot frequency sequence that receives, and said error sample is sent to said vector quantization controlled entity.
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| PCT/CN2011/080472 WO2012149791A1 (en) | 2011-09-30 | 2011-09-30 | Method, apparatus, and system for estimating crosstalk channel |
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