CN103067316B - A kind of crosstalk channel estimation method, device and system - Google Patents

A kind of crosstalk channel estimation method, device and system Download PDF

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Publication number
CN103067316B
CN103067316B CN201210587463.3A CN201210587463A CN103067316B CN 103067316 B CN103067316 B CN 103067316B CN 201210587463 A CN201210587463 A CN 201210587463A CN 103067316 B CN103067316 B CN 103067316B
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group
line
pilot frequency
frequency sequence
cross talk
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CN103067316A (en
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陈兆梅
王祥
吕捷
黄庆
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2013/090790 priority patent/WO2014101847A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0204Channel estimation of multiple channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/32Reducing cross-talk, e.g. by compensating
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals

Abstract

The invention discloses a kind of crosstalk channel estimation method, device and system, belong to networking technology area.Described method comprises: according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; The number that under obtaining current group, each group center line is right; The number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups; Use the pilot frequency sequence of joining for each component, the crosstalk channels of each group is estimated.Adopt the present invention, the time required for estimation procedure of crosstalk channels can be shortened.

Description

A kind of crosstalk channel estimation method, device and system
Technical field
The present invention relates to networking technology area, particularly a kind of crosstalk channel estimation method, device and system.
Background technology
XDSL(xDigitalSubscriberLine, various types of digital subscriber line) be a kind of Highspeed Data Transmission Technology in twisted pair telephone transmission, adopt Discrete Multitone Modulation.The system providing multichannel xDSL to access is called DSLAM(DSLAccessMultiplexer, DSL couple in multiplexer), due to electromagnetic induction principle, many lines of DSLAM access are between the multiple signals of carrying, mutually can produce interference, be called crosstalk, crosstalk can be divided into NEXT(NearEndCross-Talk, near-end cross) and FEXT(FarEndCross-Talk, far-end cross talk), near-end cross is the interference transmitted that the Received signal strength of equipment is subject to proximal device, far-end cross talk is the interference transmitted of the remote equipment that the Received signal strength of equipment is subject to.The up-downgoing channel of xDSL adopts frequency division multiplexing, so the performance of near-end cross to system does not produce too much influence, generally negligible.And far-end cross talk can produce serious influence to channel speed, cause system unstable, even circuit cannot be opened.
Crosstalk counteracting (Vectored-DSL) technology is proposed in prior art, for reducing or eliminate FEXT, main utilization carries out the possibility of the transmitting-receiving of combining at DSLAM end, crosstalk channels is estimated, namely the transfer function between each channel is calculated, and calculate the crosstalk counteracting coefficient of upstream or downstream further, according to crosstalk counteracting coefficient, signal is processed, offset the interference of FEXT.The estimation of crosstalk channels and the computational process of crosstalk counteracting coefficient in Vectored-DSL technology, in the circuit initialization procedure when user access network and circuit initialization procedure terminate after can repeatedly be employed.
Crosstalk channels H is at any one tone(carrier wave of frequency domain) on can be represented by the form of matrix, in matrix the i-th row jth row element for represent line to j to line to the transfer function of i (line to the transfer function of line to the receiving terminal of i, can reflect the crosstalk that the transmission signal of line to j produces i line to the transmitting terminal of j).In Vectored-DSL technology, for each line is to selection pilot frequency sequence, pilot frequency sequence can be a sequence of binary digits formed by 0,1, the pilot frequency sequence represented in the form of vectors be one by-1,1 vector formed (wherein, the corresponding binary digit 0 of element 1 of vector, the corresponding binary digit 1 of element-1 of vector), in order to calculate crosstalk channels more accurately, the right pilot frequency sequence of each line is mutually orthogonal.Each line on, use each bit in pilot frequency sequence to carry out modulation transmission to synchronizing symbol (syncsymbol) successively respectively, receiving terminal receives the error sample (errorsample) obtained through crosstalk on each synchronizing symbol.By to the analysis of each line to upper pilot frequency sequence and error sample, can crosstalk channels H be calculated, and then crosstalk counteracting coefficient can be drawn.
In said process, in order to calculate crosstalk channels more accurately, the length of each pilot frequency sequence should be more than or equal in system and newly activates (join) line to the sum (in addition, pilot sequence length also should be the natural number power of 2) right with (showtime) line of reaching the standard grade.System each line on, use in order corresponding pilot frequency sequence each bit to synchronizing symbol carry out modulation send (uses first bit to first synchronizing symbol carry out modulation transmission, use second bit to carry out modulation to second synchronizing symbol to send, the rest may be inferred), so the number of the synchronizing symbol of crosstalk channels estimation procedure needs is identical with the length of pilot frequency sequence.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
System generally sends symbol (as 4000symbol/s, 8000symbol/s etc.) by certain cycle, often send the data symbol of some (as 256), send a synchronizing symbol, suppose that the length of pilot frequency sequence is n, system needs n synchronizing symbol just can complete the process of a crosstalk channels estimation, visible, the time required for a crosstalk channels estimation procedure is directly proportional to the length of pilot frequency sequence.Based on existing Vectored-DSL technology, the length of pilot frequency sequence to be at least in system new activation wire to the sum right with line of reaching the standard grade, and when the new activation wire in system is more to the quantity right with line of reaching the standard grade, the time required for the estimation procedure of crosstalk channels then can be caused longer, and, the process need that the right activation of new activation wire is reached the standard grade carries out repeatedly the estimation of crosstalk channels and the computational process of crosstalk counteracting coefficient, so process very very long also will the right activation of new activation wire being caused to reach the standard grade.
Summary of the invention
In order to solve the problem of prior art, embodiments provide a kind of crosstalk channel estimation method, device and system, with the time required for the estimation procedure shortening crosstalk channels.Described technical scheme is as follows:
On the one hand, provide a kind of crosstalk channel estimation method, according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, described method comprises:
The number that under obtaining current group, each group center line is right;
The number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups;
Use the pilot frequency sequence of joining for each component, the crosstalk channels of each group is estimated.
Preferably, have a pair not mutually orthogonal pilot frequency sequence between described different groups at least, be specially:
A pair of identical pilot frequency sequence is had at least between different group.
Preferably, have a pair of identical pilot frequency sequence at least between described different groups, be specially:
For all pilot frequency sequences that each component is joined, a pilot frequency sequence in each pilot frequency sequence of all maximum with distributing number of pilot sequences groups is identical.
Preferably, the described crosstalk channels to each group is estimated, is specially and estimates the crosstalk channels right to line of reaching the standard grade the new activation wire in each group of group;
The described number right according to each group of center line, for each component joins pilot frequency sequence, is specially:
For comprising new activation wire to the group right with line of reaching the standard grade, for reach the standard grade line to distribution same pilot frequency sequence, and for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of new activation wire, for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of line of reaching the standard grade, for line of reaching the standard grade is to the same pilot frequency sequence of distribution.
Preferably, the described crosstalk channels to each group is estimated, be specially in each group of group wired between crosstalk channels estimate;
The described number right according to each group of center line, for each component joins pilot frequency sequence, is specially: for organizing interior each line to distribution number for organizing interior demand pairs object pilot frequency sequence.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, the number right according to each group of center line, for each component join pilot frequency sequence time, determine that the method for the length of pilot frequency sequence in each group comprises:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the line index of pilot frequency sequence in Walsh matrix distributed;
The number that group center line is right is greater than to the group of the maximum row index that new activation wire is right in group, and does not comprise the right group of new activation wire, determine that in group, the length of pilot frequency sequence is more than or equal to the right number of group center line;
The number that group center line is right is not more than to the group of the maximum row index that new activation wire is right in group, determines that in group, the length of pilot frequency sequence is more than or equal to the maximum row index that in group, new activation wire is right.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, the number right according to each group of center line, for each component join pilot frequency sequence time, determine that the method for the length of pilot frequency sequence in each group comprises:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the maximum row index of pilot frequency sequence in Walsh matrix distributed;
If the line pair count of the group that line pair count is maximum is greater than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to this maximum line pair count;
If the line pair count of the group that line pair count is maximum is not more than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to described maximum row index.
Preferably, it is characterized in that, also comprise:
If the span of the pilot sequence length determined comprises the second default threshold value, then the length of this pilot frequency sequence is set to described second threshold value;
If the span of the pilot sequence length determined does not comprise the second default threshold value, then the length of this pilot frequency sequence is set to the natural number power of in this span minimum 2.
Preferably, the cross talk effects data determined in the crosstalk channels estimation procedure before described basis, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, be specially:
In circuit initialization procedure, if there is line pair of having reached the standard grade in system, first time then in this secondary line initialization procedure up crosstalk channels estimation procedure and first time descending crosstalk channels estimation procedure all at the end of, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, and in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure non-dead wire between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting, or,
Reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after terminating according to circuit initialization procedure line between up cross talk effects data, and circuit initialization procedure terminate after reached the standard grade in the system determined in the descending crosstalk channels estimation procedure that carries out line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.
Preferably, when the non-dead wire centering of system has abnormal wire pair, the cross talk effects data determined in the crosstalk channels estimation procedure before described basis, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, be specially:
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; For each group, determine each line in described abnormal wire pair and group between the mean value of cross talk effects data; By described abnormal wire to joining in the maximum group of mean value; Or,
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; Determine that non-abnormal each non-dead wire is to the mean value to the right each cross talk effects data of described abnormal wire; Determine to be greater than in described each cross talk effects data the line pair that the cross talk effects data of described mean value are corresponding, and by described abnormal wire to joining this line in affiliated group.
On the other hand, provide a kind of server, described server comprises:
Grouping module, for according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting;
Acquisition module, for obtaining the number that under current group, respectively group center line is right;
Distribution module, for the number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups;
Estimation module, for using the pilot frequency sequence of joining for each component, estimates the crosstalk channels of each group.
Preferably, described distribution module, specifically for:
For each component join pilot frequency sequence time, have a pair of identical pilot frequency sequence at least between different groups.
Preferably, described distribution module, specifically for:
For each component join pilot frequency sequence time, be all pilot frequency sequences that each component is joined, all identical with a pilot frequency sequence in each pilot frequency sequence distributing the maximum group of number of pilot sequences.
Preferably, described estimation module, specifically for estimating the crosstalk channels right to line of reaching the standard grade the new activation wire in each group of group;
Described distribution module, specifically for:
For comprising new activation wire to the group right with line of reaching the standard grade, for reach the standard grade line to distribution same pilot frequency sequence, and for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of new activation wire, for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of line of reaching the standard grade, for line of reaching the standard grade is to the same pilot frequency sequence of distribution.
Preferably, described estimation module, specifically in each group of group wired between crosstalk channels estimate;
Described distribution module, specifically for: for organizing interior each line to distribution number for organizing interior demand pairs object pilot frequency sequence.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, described distribution module, specifically for:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the line index of pilot frequency sequence in Walsh matrix distributed;
The number that group center line is right is greater than to the group of the maximum row index that new activation wire is right in group, and does not comprise the right group of new activation wire, determine that in group, the length of pilot frequency sequence is more than or equal to the right number of group center line;
The number that group center line is right is not more than to the group of the maximum row index that new activation wire is right in group, determines that in group, the length of pilot frequency sequence is more than or equal to the maximum row index that in group, new activation wire is right.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, described distribution module, specifically for:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the maximum row index of pilot frequency sequence in Walsh matrix distributed;
If the line pair count of the group that line pair count is maximum is greater than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to this maximum line pair count;
If the line pair count of the group that line pair count is maximum is not more than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to described maximum row index.
Preferably, described distribution module, also for:
If the span of the pilot sequence length determined comprises the second default threshold value, then the length of this pilot frequency sequence is set to described second threshold value;
If the span of the pilot sequence length determined does not comprise the second default threshold value, then the length of this pilot frequency sequence is set to the natural number power of in this span minimum 2.
Preferably, described grouping module, specifically for:
In circuit initialization procedure, if there is line pair of having reached the standard grade in system, first time then in this secondary line initialization procedure up crosstalk channels estimation procedure and first time descending crosstalk channels estimation procedure all at the end of, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, and in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure non-dead wire between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting, or,
Reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after terminating according to circuit initialization procedure line between up cross talk effects data, and circuit initialization procedure terminate after reached the standard grade in the system determined in the descending crosstalk channels estimation procedure that carries out line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.
Preferably, when the non-dead wire centering of system has abnormal wire pair, described grouping module, specifically for:
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; For each group, determine each line in described abnormal wire pair and group between the mean value of cross talk effects data; By described abnormal wire to joining in the maximum group of mean value; Or,
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; Determine that non-abnormal each non-dead wire is to the mean value to the right each cross talk effects data of described abnormal wire; Determine to be greater than in described each cross talk effects data the line pair that the cross talk effects data of described mean value are corresponding, and by described abnormal wire to joining this line in affiliated group.
On the other hand, provide a kind of crosstalk channels estimating system, comprise terminal and server as above, wherein:
In the described use process that to be each component pilot frequency sequence of joining estimate the crosstalk channels of each group, described terminal is used for: send to described server the pilot frequency sequence that described server prenotices; Or, receive the error sample of the pilot frequency sequence that described server sends, and described error sample sent to described server.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of crosstalk channel estimation method flow chart that the embodiment of the present invention provides;
Fig. 2 is a kind of crosstalk channel estimation method flow chart that the embodiment of the present invention provides;
Fig. 3 is a kind of pilot frequency sequence allocation result schematic diagram that the embodiment of the present invention provides;
Fig. 4 is a kind of pilot frequency sequence allocation result schematic diagram that the embodiment of the present invention provides;
Fig. 5 is a kind of pilot frequency sequence allocation result schematic diagram that the embodiment of the present invention provides;
Fig. 6 is a kind of crosstalk channel estimation method flow chart that the embodiment of the present invention provides;
Fig. 7 is a kind of server architecture schematic diagram that the embodiment of the present invention provides;
Fig. 8 is a kind of server architecture schematic diagram that the embodiment of the present invention provides;
Fig. 9 is a kind of crosstalk channels estimating system structural representation that the embodiment of the present invention provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
Embodiments provide a kind of crosstalk channel estimation method, the method is in advance according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, with reference to Fig. 1, the handling process of the method can comprise the following steps:
Step 101, the number that under obtaining current group, each group center line is right.
Step 102, the number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups.
Step 103, uses the pilot frequency sequence of joining for each component, estimates the crosstalk channels of each group.
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
Embodiment two
Embodiments provide a kind of crosstalk channel estimation method, the method can be controlled to perform by the DSLAM of network side, and wherein, after pilot frequency sequence is determined, follow-up crosstalk channels estimation procedure can have terminal to participate in carrying out.In the method, can in advance according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting.Cross talk effects data be for represent each line between the data of intensity of crosstalk, line between cross talk effects data can be this line between the absolute value of crosstalk counteracting coefficient, or the absolute value of crosstalk counteracting coefficient is multiplied by default coefficient.Here, the first threshold value can be the numerical value pre-set, in addition, preferably, the first threshold value can be each non-dead wire between the mean value of cross talk effects data and the product of the Dynamic gene (e.g., can 1 be set to) preset.
Line in system to can be divided into new activation wire to, reach the standard grade line to idle (idle) line pair, new activation wire is to being the line pair that connection request access network is also carrying out initialized terminal, reached the standard grade line to being the line pair that working of access network, dead wire is to being the line pair of not asking access network and being in idle state, new activation wire can become to after conducting transmission line initialization procedure line pair of having reached the standard grade, new activation wire to line of reaching the standard grade to being referred to as non-dead wire pair again.Below the grouping process right to non-dead wire is described in detail.
Based on above-mentioned grouping, be explained in detail below by the crosstalk channel estimation method flow process shown in Fig. 1, the handling process of the method can comprise the following steps:
Step 101, the number that under obtaining current group, each group center line is right.
DSLAM, for certain frequency band, after dividing into groups, can record the relevant information of grouping at every turn, as comprise in every group which line to, often organize the right number etc. of center line, and old grouping information can be replaced by the grouping information of new record.Follow-up crosstalk channels estimation procedure can carry out based on the recent grouping of this frequency band.
Step 102, the number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups.Use not mutually orthogonal pilot frequency sequence between different group, the number of pilot frequency sequence mutually orthogonal in the wired pilot frequency sequence to distribution of institute can be reduced to, thus the length of pilot frequency sequence can be shortened.The length of the pilot frequency sequence of joining for different component can be the same or different, if different, so between group and group, all pilot frequency sequences are not mutually orthogonal.
If for each component joins the pilot frequency sequence of equal length, have a pair of identical pilot frequency sequence at least between so different groups.Preferably, be all pilot frequency sequences that each component is joined, a pilot frequency sequence in each pilot frequency sequence of group that can be all maximum with distributing number of pilot sequences is identical.Like this, being the number of pilot frequency sequence mutually orthogonal in wired pilot frequency sequence to distributing, being the total number distributing pilot frequency sequence, being also the number of pilot sequences of distributing the maximum group of number of pilot sequences.
In circuit initialization procedure, repeatedly crosstalk channels estimation procedure can be carried out, these crosstalk channels estimation procedures can be estimate new activation wire to the crosstalk channels right to line of reaching the standard grade, also can be estimate all non-dead wires between crosstalk channels.Such as, in the circuit initialization procedure that standard specifies, R-P-VECTOR1, R-P-VECTOR1-1, R-P-VECTOR1-2 stage estimates that new activation wire is to the up crosstalk channels right to line of reaching the standard grade, O-P-VECTOR1, O-P-VECTOR1-1, O-P-VECTOR2 stage estimates that new activation wire is to the descending crosstalk channels right to line of reaching the standard grade, the R-P-VECTOR2 stage be estimate all non-dead wires between up crosstalk channels, the O-P-VECTOR2-1 stage be estimate all non-dead wires between descending crosstalk channels.These crosstalk channels estimation procedures above-mentioned can carry out based on grouping.
Concrete, when estimating the crosstalk channels right to line of reaching the standard grade the new activation wire in each group of group, step 102 can be specific as follows for the process of difference group: for comprising new activation wire to the group right with line of reaching the standard grade, for reach the standard grade line to distribution same pilot frequency sequence, and for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence; For only comprising the right group of new activation wire, for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence; For only comprising the right group of line of reaching the standard grade, for line of reaching the standard grade is to the same pilot frequency sequence of distribution.
At this moment, mutually orthogonal between each pilot frequency sequence with group, and identical pilot frequency sequence between different groups, can be used also can to use different pilot frequency sequences.Also can use mutually orthogonal pilot frequency sequence with the line of reaching the standard grade in group to using identical pilot frequency sequence, line of having reached the standard grade is mutually orthogonal to the pilot frequency sequence right with new activation wire.So the minimum number of the pilot frequency sequence of group can be that in this group, new activation wire logarithm adds 1.
Concrete, to the institute in each group of group wired crosstalk channels between (namely in group all non-dead wires to) is estimated time, the process of step 102 can be specific as follows: for organizing interior each line to distribution number for organizing interior demand pairs object pilot frequency sequence.
In order to line each in estimation group accurately between crosstalk channels, can for each line in group be to distributing mutually orthogonal pilot frequency sequence.The each group of pilot frequency sequence used can be the same or different.Such as, L1 belongs to G1, and L2 belongs to G2, and the pilot frequency sequence that L1 with L2 uses can be identical.
Because the vector of each row of Walsh matrix is mutually orthogonal, so a line of Walsh matrix can be used as a pilot frequency sequence, can use line index to identify pilot frequency sequence corresponding be which of Walsh matrix, line index is 1 corresponding the first row, line index is 2 correspondence second row, and the rest may be inferred.
It is to be noted in addition, for the Walsh matrix of not same order, low order Walsh matrix is identical with each element in the high-order Walsh matrix upper left corner, front two row two row of such as quadravalence Walsh matrix are a second order Walsh matrix, so, not the Walsh matrix of same order on any identical row before n element be identical.
In some cases, can in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed.According to the characteristic that above-mentioned not same order Walsh matrix has, the front n position of each pilot frequency sequence that corresponding row index is identical is identical.Like this, DSLAM first time up crosstalk channels estimation procedure in, its line index in Walsh matrix can be determined after choosing pilot frequency sequence, again by the preset length (length that general selection one is larger corresponding for this line index, as 512) pilot frequency sequence inform terminal, follow-up each up crosstalk channels estimation procedure, DSLAM, without the need to reselecting pilot frequency sequence, also notifies without the need to sending to terminal.In this case, in up crosstalk channels estimation procedure, the number right according to each group of center line, for each component join pilot frequency sequence time, determine that the method for the length of pilot frequency sequence in each group can be as follows:
Method one, the first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the line index of pilot frequency sequence in Walsh matrix distributed; The number that group center line is right is greater than to the group of the maximum row index that new activation wire is right in group, and does not comprise the right group of new activation wire, determine that in group, the length of pilot frequency sequence is more than or equal to the right number of group center line; The number that group center line is right is not more than to the group of the maximum row index that new activation wire is right in group, determines that in group, the length of pilot frequency sequence is more than or equal to the maximum row index that in group, new activation wire is right.Wherein, this secondary line initialization procedure and ongoing circuit initialization procedure or the circuit initialization procedure that just terminated.
Based on method one, the pilot sequence length of joining for each component can not be identical.For each group, because it is constant to the line index choosing pilot frequency sequence to remain new activation wire, and to ensure to organize the mutually orthogonal of interior pilot frequency sequence, so the length of its pilot frequency sequence is at least the maximum row index that in this group, new activation wire is right.And the length of pilot frequency sequence needs the natural number power being set to 2.So preferred, pilot sequence length can be set to be more than or equal to the natural number power of 2 of this maximum row index.And for some group, if its number organizing interior lines right is greater than this maximum row index, then in order to ensure to organize the mutually orthogonal of interior pilot frequency sequence, the length of its pilot frequency sequence can be at least the right number in group interior lines.At this moment preferred, pilot sequence length can be set to the natural number power being more than or equal to demand pairs object 2 in group.
Method two, the first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the maximum row index of pilot frequency sequence in Walsh matrix distributed; If the line pair count of the group that line pair count is maximum is greater than this maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to this maximum line pair count; If the line pair count of the group that line pair count is maximum is not more than this maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to described maximum row index.
Based on method two, the pilot sequence length of joining for each component is identical.That is be the pilot frequency sequence to distributing equal length wired in each group, so the length of pilot frequency sequence should satisfy the demands the longest group of pilot frequency sequence.The line pair count of group maximum for line pair count and maximum row index can be compared, if maximum line pair count is greater than maximum row index, then illustrate that the longest group of demand pilot frequency sequence is the maximum group of line pair count, the length that can arrange pilot frequency sequence is at least this maximum line pair count, is preferably greater than or equal to the natural number power of this max line logarithm object 2.If maximum line pair count is not more than maximum row index, the group of group belonging to this maximum row index that demand pilot frequency sequence is the longest is then described, the length that can arrange pilot frequency sequence is at least this maximum row index, is preferably greater than or equal to the natural number power of 2 of this maximum row index.
In addition, in order to make the length of pilot frequency sequence satisfy the demands the longest group of pilot frequency sequence, also can a kind of method of reference method, according to maximum row index in the line pair count in each group of group and group, obtain each group of demand to pilot sequence length, then compare and draw maximum pilot sequence length.
Preferably, for the processing mode in said method one and method two, following process can also be increased: if the span of the pilot sequence length determined comprises the second default threshold value, then the length of this pilot frequency sequence is set to this second threshold value; If the span of the pilot sequence length determined does not comprise the second default threshold value, then the length of this pilot frequency sequence is set to the natural number power of in this span minimum 2.Adopt this process, can arrange the lower limit of a pilot sequence length, make the length of pilot frequency sequence be not less than this length lower limit, this second threshold value preset is preferably the natural number power of 2.
Step 103, uses the pilot frequency sequence of joining for each component, estimates the crosstalk channels of each group.
DSLAM for each group distribute pilot frequency sequence after, then can according to distribute pilot frequency sequence, the crosstalk channels of each group is estimated.
When estimating descending crosstalk channels, DSLAM each non-dead wire on use corresponding pilot frequency sequence to synchronizing symbol carry out modulation send, and receive the error sample of each terminal feedback, then according to the analysis of pilot frequency sequence and error sample, calculate descending crosstalk channels.
When estimating up crosstalk channels, DSLAM is each line to after distribution pilot frequency sequence, determines the line index of pilot frequency sequence in Walsh matrix, by each pilot frequency sequence of preset length corresponding for each line index by corresponding line to notifying its terminal connected.Terminal after receiving notice, then according to the pilot frequency sequence that it receives, is modulated synchronizing symbol and sends to DSLAM.DSLAM receives corresponding error sample, then according to the analysis of pilot frequency sequence and error sample, calculates up crosstalk channels.
Here, terminal only need according to the pilot frequency sequence of preset length in notice, and the modulation carrying out synchronizing symbol sends, and can not know that DSLAM is actual in its line is to the length of the pilot frequency sequence distributed.Like this, for each up crosstalk channels estimation procedure in a circuit initialization procedure described in step 102 be in system each new activation wire to the line index of pilot frequency sequence in the Walsh matrix situation about remaining unchanged of distributing, the length of pilot frequency sequence can change, the length of the pilot frequency sequence that DSLAM can distribute according to it, receives error sample.
Below in conjunction with circuit initialization procedure, the grouping process right to non-dead wire is described in detail.
In circuit initialization procedure, crosstalk channels can be carried out repeatedly and estimate, after circuit initialization procedure terminates, also can carry out repeatedly crosstalk channels and estimate, estimate respectively to have reached the standard grade line between crosstalk channels.According to these Procedure Acquisitions to crosstalk channels can divide into groups, make the line of different group between cross talk effects data be less than the first threshold value of setting, namely think that the crosstalk between different groups can be ignored.In addition, the condition that can also increase grouping is, group interior lines between cross talk effects data be more than or equal to the first threshold value, the line can not ignored by mutual crosstalk is to point at one group.
Concrete, in circuit initialization procedure, if there is line pair of having reached the standard grade in system, so first time up crosstalk channels estimation procedure (the R-P-VECTOR1 stage (up direction) in the circuit initialization procedure of standard definition just can to get in system new activation wire to the up cross talk effects data right to line of reaching the standard grade after terminating, just can to get in system new activation wire to the descending cross talk effects data right to line of reaching the standard grade at descending crosstalk channels estimation procedure (O-P-VECTOR1 stage (down direction)) for the first time after terminating.So, preferably, can first time in this secondary line initialization procedure at the end of up crosstalk channels estimation procedure, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data be less than the first threshold value of setting; Also can first time in this secondary line initialization procedure at the end of descending crosstalk channels estimation procedure, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between descending cross talk effects data be less than the first threshold value of setting.
Like this, follow-up crosstalk channels estimation procedure can carry out on the basis of this grouping, certainly, also in follow-up process, again can divide into groups, can obtain dividing into groups more accurately.
The initialized process of circuit can carry out initialization to up channel and down channel respectively, up channel and down channel use different frequency ranges, line between crosstalk channels in different frequency ranges separate, so the estimation procedure of up crosstalk channels and descending crosstalk channels can be separate.To non-dead wire to when dividing into groups, can divide into groups based on up cross talk effects data or based on descending cross talk effects data respectively, two kinds of packet modes are independent of each other.
In addition, preferably, also up cross talk effects data and descending cross talk effects data can be considered, divide into groups, namely in circuit initialization procedure, if there is line pair of having reached the standard grade in system, first time then in this secondary line initialization procedure up crosstalk channels estimation procedure and first time descending crosstalk channels estimation procedure all at the end of, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, and in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure non-dead wire between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.In addition, the condition that can increase grouping is, group interior lines between up cross talk effects data and/or descending cross talk effects data be more than or equal to the first threshold value.Like this, by mutual up crosstalk can not be ignored and/or descending crosstalk can not be ignored line to point at one group.This group result can be applied in follow-up up crosstalk channels estimation procedure and descending crosstalk channels estimation procedure.
Concrete, in circuit initialization procedure, if there is not line pair of having reached the standard grade in system, then circuit initialization procedure can only carry out a crosstalk channels estimation procedure on up (or descending) direction, in estimating system each new activation wire between crosstalk channels, carrying out once up crosstalk channels estimation procedure and once descending crosstalk channels estimation procedure, new activation wire becomes to reaching the standard grade line pair of reaching the standard grade.In this case, the process of grouping can be carried out after circuit initialization procedure terminates, in addition, the right situation of line of reaching the standard grade is there is in above-mentioned circuit initialization procedure system, also can divide into groups after circuit initialization procedure terminates, the result of now dividing into groups can be applied to circuit and reach the standard grade the stage in the follow-up crosstalk channels estimation procedure of (stage between two secondary line initialization procedures can carry out repeatedly crosstalk channels estimation procedure in this stage).
Preferably, reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after can terminating according to circuit initialization procedure line between up cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data be less than the first threshold value of setting; Also reached the standard grade in the system determined in the descending crosstalk channels estimation procedure carried out after can terminating according to circuit initialization procedure line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between descending cross talk effects data be less than the first threshold value of setting.Because, new activation wire to becoming line of reaching the standard grade to rear, each line between cross talk effects data may change, institute in this way can obtain dividing into groups more accurately.
In addition, also up cross talk effects data and descending cross talk effects data can be considered, divide into groups, namely reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after terminating according to circuit initialization procedure line between up cross talk effects data, and circuit initialization procedure terminate after reached the standard grade in the system determined in the descending crosstalk channels estimation procedure that carries out line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.In addition, the condition that can increase grouping is, group interior lines between up cross talk effects data and/or descending cross talk effects data be more than or equal to the first threshold value.Like this, by mutual up crosstalk can not be ignored and/or descending crosstalk can not be ignored line to point at one group.
When the non-dead wire centering of system have abnormal wire to (as, the line that pad value exceeds normal range (NR) to, repeatedly the line that can not reach the standard grade of initialization is to the line equity of, loose contact) time, the process of grouping can be specific as follows: according to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; For each group, determine each line in described abnormal wire pair and group between the mean value of cross talk effects data; By abnormal wire to joining in the maximum group of mean value.Two lines between cross talk effects data comprise First Line to the cross talk effects data right to the second line, and the second line is to the cross talk effects data right to First Line.
Such as, 5 non-dead wires are had to L1, L2, L3, L4, L5 in system, wherein L5 is abnormal wire pair, so, first, L1, L2, L3, L4 are divided into groups, suppose to be divided into G1, G2 two groups, G1={L1, L2}, G2={L3, L4}, then, calculate the mean value of the cross talk effects data that each line is right in L5 and G1, be denoted as Weight L 5 ↔ G 1 = ( weight L 5 → L 1 + weight L 1 → L 5 + weight L 5 → L 2 + weight L 2 → L 5 ) / 4 , Weight l5 → L1the cross talk effects data of L5 to L1, weight l1 → L5the cross talk effects data of L1 to L5, weight l5 → L2the cross talk effects data of L5 to L2, weight l2 → L5be the cross talk effects data of L2 to L5, and calculate the mean value of the cross talk effects data that each line is right in L5 and G2 in the same way finally, compare with suppose comparatively large, then join in G1 by L5, the group result obtained is G1={L1, L2, L5}, G2={L3, L4}.
If there is multiple abnormal non-dead wire pair, then to not abnormal non-dead wire to grouping after, to each abnormal wire pair, determine the grouping belonging to it all in a manner mentioned above.
In addition, grouping process under these abnormal conditions also can be: according to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; Determine that non-abnormal each non-dead wire is to the mean value to the right each cross talk effects data of described abnormal wire; Determine to be greater than in described each cross talk effects data the line pair that the cross talk effects data of described mean value are corresponding, and by described abnormal wire to joining this line in affiliated group.
It should be noted that, the above-mentioned grouping carried out based on up cross talk effects data, can be applied in follow-up up crosstalk channels estimation procedure, based on the grouping that descending cross talk effects data are carried out, can be applied in follow-up descending crosstalk channels estimation procedure, based on the grouping that up cross talk effects data and descending cross talk effects data are carried out, can be applied in follow-up up crosstalk channels estimation procedure and row crosstalk channels estimation procedure.
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
Embodiment three
Embodiments provide a kind of crosstalk channel estimation method, below in conjunction with circuit initialized process, the crosstalk channel estimation method that the embodiment of the present invention provides is further elaborated, in this circuit initialization procedure there is line pair of having reached the standard grade in system, concrete handling process see Fig. 2, can comprise the following steps:
Step 201, the access request that DSLAM receiving terminal sends, and carry out handshake procedure with terminal.
Step 202, in DSLAM estimating system, new activation wire is to the descending crosstalk channels (corresponding O-P-VECTOR1 stage) right to line of reaching the standard grade, and in estimating system new activation wire to the up crosstalk channels (corresponding R-P-VECTOR1 stage) right to line of reaching the standard grade.
In this step can not to non-dead wire to dividing into groups, the distribution of pilot frequency sequence can see Fig. 3, in figure, L1-L6 is line pair of having reached the standard grade, too G1={L1, L2, L3}, G2={L4, L5, L6} is organized after upper once circuit initialization procedure terminates, L7-L12 is new activation wire pair, and existing grouping before can't have an impact to the distribution of current pilot frequency sequence.Here for L1-L6 is assigned with identical pilot frequency sequence.
Step 203, DSLAM according to the descending cross talk effects data determined in crosstalk channels estimation procedure and up cross talk effects data, to the non-dead wire in system to dividing into groups.Wherein, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting, and group interior lines between up cross talk effects data and/or descending cross talk effects data be not less than this first threshold value.Here suppose that group result is: G1={L1, L2, L3, L7, L8, L9}, G2={L4, L5, L6, L10, L11, L12}.
Step 204, in R-P-VECTOR1-1, R-P-VECTOR1-2, O-P-VECTOR1-1, O-P-VECTOR2 stage, DSLAM, based on above-mentioned grouping, estimates that new activation wire in each group of group is to the upstream or downstream crosstalk channels right to line of reaching the standard grade.
Concrete, in above-mentioned each stage, first, the DSLAM number that under first can obtaining current group, each group center line is right, then, the number that DSLAM is right according to each group of center line, for each component joins pilot frequency sequence, finally, DSLAM, according to the pilot frequency sequence of joining for each component, estimates the crosstalk channels of each group.
Step 205, in R-P-VECTOR2 and the O-P-VECTOR2-1 stage, DSLAM based on above-mentioned grouping, to estimate in each group of group wired right uplink and downlink crosstalk channels.Detailed process as above, no longer carries out tired stating.
In the crosstalk channels estimation procedure in each stage of above-mentioned steps 204,205, the distribution of pilot frequency sequence can as shown in Fig. 4 or Fig. 5, different groups can adopt identical pilot frequency sequence also can adopt different pilot frequency sequences, in the method for salary distribution shown in Fig. 4, new activation wire is to the line index do not used in step 202, in the method for salary distribution shown in Fig. 5, new activation wire is to the line index used in step 202.For the line of reaching the standard grade in group is to being assigned with mutually orthogonal pilot frequency sequence in Fig. 4, Fig. 5, for each stage in step 204, also can for the line of reaching the standard grade in group be to distributing identical pilot frequency sequence.
Step 206, new activation wire is to becoming line pair of reaching the standard grade, and circuit initialization completes.The work such as Multiple Channel Analysis and data interaction can be carried out in this stage.
Further, after step 206, DSLAM can also reach the standard grade line right crosstalk channels has been estimated all in system, according to the up cross talk effects data obtained in crosstalk channels estimation procedure and descending cross talk effects data to line of reaching the standard grade to dividing into groups, and according to new result of dividing into groups, carry out the reach the standard grade the stage follow-up crosstalk channels of (stage between two secondary line initialization procedures can carry out repeatedly crosstalk channels estimation procedure in this stage) of circuit to estimate.
According to the crosstalk channels on the uplink and downlink direction of each group that finally obtains, crosstalk counteracting coefficient can be calculated further, can process, to reduce system interference the signal receiving in subsequent data transmission process and send line of having reached the standard grade in system according to crosstalk counteracting coefficient.
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
Embodiment four
Embodiments provide a kind of crosstalk channel estimation method, below in conjunction with the initialized process of circuit and the follow-up circuit stage of reaching the standard grade, the crosstalk channel estimation method that the embodiment of the present invention provides is further elaborated, in this circuit initialization procedure there is not line pair of having reached the standard grade in system, concrete handling process see Fig. 6, can comprise the following steps:
Step 601, the access request that DSLAM receiving terminal sends, and carry out handshake procedure with terminal.
Step 602, in R-P-VECTOR2 and the O-P-VECTOR2-1 stage, DSLAM estimate all new activation wires between uplink and downlink crosstalk channels.Owing to there is not line pair of having reached the standard grade in system, O-P-VECTOR1, R-P-VECTOR1, R-P-VECTOR1-1, R-P-VECTOR1-2, O-P-VECTOR1-1, O-P-VECTOR2 stage can not be carried out.
Step 603, new activation wire is to becoming line pair of reaching the standard grade, and circuit initialization completes.The work such as Multiple Channel Analysis and data interaction can be carried out in this stage.
Step 604, the uplink and downlink crosstalk channels that DSLAM is right to lines of having reached the standard grade all in system is estimated, the up cross talk effects data obtained according to crosstalk channels estimation procedure and descending cross talk effects data to line of reaching the standard grade to dividing into groups.
Step 605, DSLAM, according to the result of new grouping, carries out the reach the standard grade the stage follow-up crosstalk channels of (stage between two secondary line initialization procedures can carry out repeatedly crosstalk channels estimation procedure in this stage) of circuit and estimates.
According to the crosstalk channels on the uplink and downlink direction of each group that finally obtains, crosstalk counteracting coefficient can be calculated further, can process, to reduce system interference the signal receiving in subsequent data transmission process and send line of having reached the standard grade in system according to crosstalk counteracting coefficient.
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
Embodiment five
Based on identical technical conceive, embodiments provide a kind of server, see Fig. 7, this server comprises:
Grouping module 710, for according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting;
Acquisition module 720, for obtaining the number that under current group, respectively group center line is right;
Distribution module 730, for the number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups;
Estimation module 740, for using the pilot frequency sequence of joining for each component, estimates the crosstalk channels of each group.
Preferably, described distribution module 730, specifically for:
For each component join pilot frequency sequence time, have a pair of identical pilot frequency sequence at least between different groups.
Preferably, described distribution module 730, specifically for:
For each component join pilot frequency sequence time, be all pilot frequency sequences that each component is joined, all identical with a pilot frequency sequence in each pilot frequency sequence distributing the maximum group of number of pilot sequences.
Preferably, described estimation module 740, specifically for estimating the crosstalk channels right to line of reaching the standard grade the new activation wire in each group of group;
Described distribution module 730, specifically for:
For comprising new activation wire to the group right with line of reaching the standard grade, for reach the standard grade line to distribution same pilot frequency sequence, and for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of new activation wire, for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of line of reaching the standard grade, for line of reaching the standard grade is to the same pilot frequency sequence of distribution.
Preferably, described estimation module 740, specifically in each group of group wired between crosstalk channels estimate;
Described distribution module 730, specifically for: for organizing interior each line to distribution number for organizing interior demand pairs object pilot frequency sequence.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, described distribution module 730, specifically for:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the line index of pilot frequency sequence in Walsh matrix distributed;
The number that group center line is right is greater than to the group of the maximum row index that new activation wire is right in group, and does not comprise the right group of new activation wire, determine that in group, the length of pilot frequency sequence is more than or equal to the right number of group center line;
The number that group center line is right is not more than to the group of the maximum row index that new activation wire is right in group, determines that in group, the length of pilot frequency sequence is more than or equal to the maximum row index that in group, new activation wire is right.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, described distribution module 730, specifically for:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the maximum row index of pilot frequency sequence in Walsh matrix distributed;
If the line pair count of the group that line pair count is maximum is greater than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to this maximum line pair count;
If the line pair count of the group that line pair count is maximum is not more than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to described maximum row index.
Preferably, described distribution module 730, also for:
If the span of the pilot sequence length determined comprises the second default threshold value, then the length of this pilot frequency sequence is set to described second threshold value;
If the span of the pilot sequence length determined does not comprise the second default threshold value, then the length of this pilot frequency sequence is set to the natural number power of in this span minimum 2.
Preferably, described grouping module 710, specifically for:
In circuit initialization procedure, if there is line pair of having reached the standard grade in system, first time then in this secondary line initialization procedure up crosstalk channels estimation procedure and first time descending crosstalk channels estimation procedure all at the end of, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, and in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure non-dead wire between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting, or,
Reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after terminating according to circuit initialization procedure line between up cross talk effects data, and circuit initialization procedure terminate after reached the standard grade in the system determined in the descending crosstalk channels estimation procedure that carries out line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.
Preferably, when the non-dead wire centering of system has abnormal wire pair, described grouping module 710, specifically for:
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; For each group, determine each line in described abnormal wire pair and group between the mean value of cross talk effects data; By described abnormal wire to joining in the maximum group of mean value; Or,
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; Determine that non-abnormal each non-dead wire is to the mean value to the right each cross talk effects data of described abnormal wire; Determine to be greater than in described each cross talk effects data the line pair that the cross talk effects data of described mean value are corresponding, and by described abnormal wire to joining this line in affiliated group.
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
Embodiment six
Based on identical technical conceive, embodiments provide a kind of server, see Fig. 8, this server comprises processor 810 and memory 820, and processor 810 and memory 820 are configured to perform following operation:
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; The number that under obtaining current group, each group center line is right; The number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups; Use the pilot frequency sequence of joining for each component, the crosstalk channels of each group is estimated.
Preferably, have a pair not mutually orthogonal pilot frequency sequence between described different groups at least, be specially:
A pair of identical pilot frequency sequence is had at least between different group.
Preferably, have a pair of identical pilot frequency sequence at least between described different groups, be specially:
For all pilot frequency sequences that each component is joined, a pilot frequency sequence in each pilot frequency sequence of all maximum with distributing number of pilot sequences groups is identical.
Preferably, the described crosstalk channels to each group is estimated, is specially and estimates the crosstalk channels right to line of reaching the standard grade the new activation wire in each group of group;
The described number right according to each group of center line, for each component joins pilot frequency sequence, is specially:
For comprising new activation wire to the group right with line of reaching the standard grade, for reach the standard grade line to distribution same pilot frequency sequence, and for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of new activation wire, for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of line of reaching the standard grade, for line of reaching the standard grade is to the same pilot frequency sequence of distribution.
Preferably, the described crosstalk channels to each group is estimated, be specially in each group of group wired between crosstalk channels estimate;
The described number right according to each group of center line, for each component joins pilot frequency sequence, is specially: for organizing interior each line to distribution number for organizing interior demand pairs object pilot frequency sequence.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, the number right according to each group of center line, for each component join pilot frequency sequence time, determine that the method for the length of pilot frequency sequence in each group comprises:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the line index of pilot frequency sequence in Walsh matrix distributed;
The number that group center line is right is greater than to the group of the maximum row index that new activation wire is right in group, and does not comprise the right group of new activation wire, determine that in group, the length of pilot frequency sequence is more than or equal to the right number of group center line;
The number that group center line is right is not more than to the group of the maximum row index that new activation wire is right in group, determines that in group, the length of pilot frequency sequence is more than or equal to the maximum row index that in group, new activation wire is right.
Preferably, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, the number right according to each group of center line, for each component join pilot frequency sequence time, determine that the method for the length of pilot frequency sequence in each group comprises:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the maximum row index of pilot frequency sequence in Walsh matrix distributed;
If the line pair count of the group that line pair count is maximum is greater than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to this maximum line pair count;
If the line pair count of the group that line pair count is maximum is not more than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to described maximum row index.
Preferably, it is characterized in that, also comprise:
If the span of the pilot sequence length determined comprises the second default threshold value, then the length of this pilot frequency sequence is set to described second threshold value;
If the span of the pilot sequence length determined does not comprise the second default threshold value, then the length of this pilot frequency sequence is set to the natural number power of in this span minimum 2.
Preferably, the cross talk effects data determined in the crosstalk channels estimation procedure before described basis, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, be specially:
In circuit initialization procedure, if there is line pair of having reached the standard grade in system, first time then in this secondary line initialization procedure up crosstalk channels estimation procedure and first time descending crosstalk channels estimation procedure all at the end of, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, and in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure non-dead wire between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting, or,
Reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after terminating according to circuit initialization procedure line between up cross talk effects data, and circuit initialization procedure terminate after reached the standard grade in the system determined in the descending crosstalk channels estimation procedure that carries out line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.
Preferably, when the non-dead wire centering of system has abnormal wire pair, the cross talk effects data determined in the crosstalk channels estimation procedure before described basis, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, be specially:
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; For each group, determine each line in described abnormal wire pair and group between the mean value of cross talk effects data; By described abnormal wire to joining in the maximum group of mean value; Or,
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; Determine that non-abnormal each non-dead wire is to the mean value to the right each cross talk effects data of described abnormal wire; Determine to be greater than in described each cross talk effects data the line pair that the cross talk effects data of described mean value are corresponding, and by described abnormal wire to joining this line in affiliated group.
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
Embodiment seven
Based on identical technical conceive, embodiments provide a kind of crosstalk channels estimating system, see Fig. 9, comprise terminal 910 and the server as described in above-described embodiment 920, wherein:
In the described use process that to be each component pilot frequency sequence of joining estimate the crosstalk channels of each group, described terminal 910 for: send to described server 920 pilot frequency sequence that described server 920 prenotices; Or, receive the error sample of the pilot frequency sequence that described server 920 sends, and described error sample sent to described server 920.
In the embodiment of the present invention, by the non-dead wire in system to being divided into negligible group of multiple crosstalk each other, because the crosstalk between group and group can be ignored, so each group can be regarded as an independently system, when distributing pilot frequency sequence, a pair not mutually orthogonal pilot frequency sequence is had at least between different group, reduce the number of mutually orthogonal pilot frequency sequence, thus when carrying out crosstalk channels and estimating, required pilot sequence length also can shorten, and therefore can shorten the time required for estimation procedure of crosstalk channels.
It should be noted that: the crosstalk channels estimation unit that above-described embodiment provides is when estimating crosstalk channels, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by device is divided into different functional modules, to complete all or part of function described above.In addition, the crosstalk channels estimation unit that above-described embodiment provides and crosstalk channel estimation method embodiment belong to same design, and its specific implementation process refers to embodiment of the method, repeats no more here.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (19)

1. a crosstalk channel estimation method, it is characterized in that, described method comprises: according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting;
The number that under obtaining current group, each group center line is right;
The number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups;
Use the pilot frequency sequence of joining for each component, the crosstalk channels of each group is estimated;
Wherein, the cross talk effects data determined in crosstalk channels estimation procedure before described basis, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, be specially: in circuit initialization procedure, if there is line pair of having reached the standard grade in system, first time then in this secondary line initialization procedure up crosstalk channels estimation procedure and first time descending crosstalk channels estimation procedure all at the end of, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, and in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure non-dead wire between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting, or, reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after terminating according to circuit initialization procedure line between up cross talk effects data, and circuit initialization procedure terminate after reached the standard grade in the system determined in the descending crosstalk channels estimation procedure that carries out line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.
2. method according to claim 1, is characterized in that, has a pair not mutually orthogonal pilot frequency sequence at least, be specially between described different groups:
A pair of identical pilot frequency sequence is had at least between different group.
3. method according to claim 2, is characterized in that, has a pair of identical pilot frequency sequence at least, be specially between described different groups:
For all pilot frequency sequences that each component is joined, a pilot frequency sequence in each pilot frequency sequence of all maximum with distributing number of pilot sequences groups is identical.
4. method according to claim 1, is characterized in that, the described crosstalk channels to each group is estimated, is specially and estimates the crosstalk channels right to line of reaching the standard grade the new activation wire in each group of group;
The described number right according to each group of center line, for each component joins pilot frequency sequence, is specially:
For comprising new activation wire to the group right with line of reaching the standard grade, for reach the standard grade line to distribution same pilot frequency sequence, and for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of new activation wire, for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of line of reaching the standard grade, for line of reaching the standard grade is to the same pilot frequency sequence of distribution.
5. method according to claim 1, is characterized in that, the described crosstalk channels to each group is estimated, be specially in each group of group wired between crosstalk channels estimate;
The described number right according to each group of center line, for each component joins pilot frequency sequence, is specially: for organizing interior each line to distribution number for organizing interior demand pairs object pilot frequency sequence.
6. method according to claim 1, is characterized in that, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, the number right according to each group of center line, for each component join pilot frequency sequence time, determine that the method for the length of pilot frequency sequence in each group comprises:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the line index of pilot frequency sequence in Walsh matrix distributed;
The number that group center line is right is greater than to the group of the maximum row index that new activation wire is right in group, and does not comprise the right group of new activation wire, determine that in group, the length of pilot frequency sequence is more than or equal to the right number of group center line;
The number that group center line is right is not more than to the group of the maximum row index that new activation wire is right in group, determines that in group, the length of pilot frequency sequence is more than or equal to the maximum row index that in group, new activation wire is right.
7. method according to claim 1, is characterized in that, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, the number right according to each group of center line, for each component join pilot frequency sequence time, determine that the method for the length of pilot frequency sequence in each group comprises:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the maximum row index of pilot frequency sequence in Walsh matrix distributed;
If the line pair count of the group that line pair count is maximum is greater than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to this maximum line pair count;
If the line pair count of the group that line pair count is maximum is not more than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to described maximum row index.
8. the method according to claim 6 or 7, is characterized in that, also comprises:
If the span of the pilot sequence length determined comprises the second default threshold value, then the length of this pilot frequency sequence is set to described second threshold value;
If the span of the pilot sequence length determined does not comprise the second default threshold value, then the length of this pilot frequency sequence is set to the natural number power of in this span minimum 2.
9. method according to claim 1, it is characterized in that, when the non-dead wire centering of system has abnormal wire pair, the cross talk effects data determined in crosstalk channels estimation procedure before described basis, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting, be specially:
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; For each group, determine each line in described abnormal wire pair and group between the mean value of cross talk effects data; By described abnormal wire to joining in the maximum group of mean value; Or,
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; Determine that non-abnormal each non-dead wire is to the mean value to the right each cross talk effects data of described abnormal wire; Determine to be greater than in described each cross talk effects data the line pair that the cross talk effects data of described mean value are corresponding, and by described abnormal wire to joining this line in affiliated group.
10. a server, is characterized in that, described server comprises:
Grouping module, for according to the cross talk effects data determined in crosstalk channels estimation procedure before, to the non-dead wire in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting;
Acquisition module, for obtaining the number that under current group, respectively group center line is right;
Distribution module, for the number right according to each group of center line, for each component joins pilot frequency sequence, has a pair not mutually orthogonal pilot frequency sequence at least between different groups;
Estimation module, for using the pilot frequency sequence of joining for each component, estimates the crosstalk channels of each group;
Wherein, described grouping module, specifically for: in circuit initialization procedure, if there is line pair of having reached the standard grade in system, first time then in this secondary line initialization procedure up crosstalk channels estimation procedure and first time descending crosstalk channels estimation procedure all at the end of, according to non-dead wire in the system determined in the first time of this secondary line initialization procedure up crosstalk channels estimation procedure between up cross talk effects data, and in the system determined in the first time of this secondary line initialization procedure descending crosstalk channels estimation procedure non-dead wire between descending cross talk effects data, to the non-dead wire in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting, or, reached the standard grade in the system determined in the up crosstalk channels estimation procedure carried out after terminating according to circuit initialization procedure line between up cross talk effects data, and circuit initialization procedure terminate after reached the standard grade in the system determined in the descending crosstalk channels estimation procedure that carries out line between descending cross talk effects data, to the line of reaching the standard grade in system to dividing into groups, the line of different group between up cross talk effects data and descending cross talk effects data be all less than the first threshold value of setting.
11. servers according to claim 10, is characterized in that, described distribution module, specifically for:
For each component join pilot frequency sequence time, have a pair of identical pilot frequency sequence at least between different groups.
12. servers according to claim 11, is characterized in that, described distribution module, specifically for:
For each component join pilot frequency sequence time, be all pilot frequency sequences that each component is joined, all identical with a pilot frequency sequence in each pilot frequency sequence distributing the maximum group of number of pilot sequences.
13. servers according to claim 10, is characterized in that, described estimation module, specifically for estimating the crosstalk channels right to line of reaching the standard grade the new activation wire in each group of group;
Described distribution module, specifically for:
For comprising new activation wire to the group right with line of reaching the standard grade, for reach the standard grade line to distribution same pilot frequency sequence, and for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of new activation wire, for new activation wire to distribution number be new activation wire logarithm object pilot frequency sequence;
For only comprising the right group of line of reaching the standard grade, for line of reaching the standard grade is to the same pilot frequency sequence of distribution.
14. servers according to claim 10, is characterized in that, described estimation module, specifically in each group of group wired between crosstalk channels estimate;
Described distribution module, specifically for: for organizing interior each line to distribution number for organizing interior demand pairs object pilot frequency sequence.
15. servers according to claim 10, is characterized in that, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, described distribution module, specifically for:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the line index of pilot frequency sequence in Walsh matrix distributed;
The number that group center line is right is greater than to the group of the maximum row index that new activation wire is right in group, and does not comprise the right group of new activation wire, determine that in group, the length of pilot frequency sequence is more than or equal to the right number of group center line;
The number that group center line is right is not more than to the group of the maximum row index that new activation wire is right in group, determines that in group, the length of pilot frequency sequence is more than or equal to the maximum row index that in group, new activation wire is right.
16. servers according to claim 10, is characterized in that, in a circuit initialization procedure, each up crosstalk channels estimation procedure is that in system, each new activation wire remains unchanged to the line index of pilot frequency sequence in Walsh matrix distributed;
In up crosstalk channels estimation procedure, described distribution module, specifically for:
The first time obtaining this secondary line initialization procedure in up crosstalk channels estimation procedure for each new activation wire in system is to the maximum row index of pilot frequency sequence in Walsh matrix distributed;
If the line pair count of the group that line pair count is maximum is greater than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to this maximum line pair count;
If the line pair count of the group that line pair count is maximum is not more than described maximum row index, then determine that the length of pilot frequency sequence in each group is equal, and be more than or equal to described maximum row index.
17. servers according to claim 15 or 16, is characterized in that, described distribution module, also for:
If the span of the pilot sequence length determined comprises the second default threshold value, then the length of this pilot frequency sequence is set to described second threshold value;
If the span of the pilot sequence length determined does not comprise the second default threshold value, then the length of this pilot frequency sequence is set to the natural number power of in this span minimum 2.
18. servers according to claim 10, is characterized in that, when the non-dead wire centering of system has abnormal wire pair, and described grouping module, specifically for:
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; For each group, determine each line in described abnormal wire pair and group between the mean value of cross talk effects data; By described abnormal wire to joining in the maximum group of mean value; Or,
According to the cross talk effects data determined in crosstalk channels estimation procedure before, to abnormal non-dead wire non-in system to dividing into groups, the line of different group between cross talk effects data be less than the first threshold value of setting; Determine that non-abnormal each non-dead wire is to the mean value to the right each cross talk effects data of described abnormal wire; Determine to be greater than in described each cross talk effects data the line pair that the cross talk effects data of described mean value are corresponding, and by described abnormal wire to joining this line in affiliated group.
19. 1 kinds of crosstalk channels estimating systems, is characterized in that, comprise terminal and the server as described in claim 10-18, wherein:
In the described use process that to be each component pilot frequency sequence of joining estimate the crosstalk channels of each group, described terminal is used for: send to described server the pilot frequency sequence that described server prenotices; Or, receive the error sample of the pilot frequency sequence that described server sends, and described error sample sent to described server.
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