CN104247358A

CN104247358A - Probe modulation method, error feedback method, and corresponding device and system

Info

Publication number: CN104247358A
Application number: CN201380002193.8A
Authority: CN
Inventors: 王祥
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-04-03
Filing date: 2013-04-26
Publication date: 2014-12-24
Anticipated expiration: 2033-04-26
Also published as: CN104247358B

Abstract

The present invention relates to providing a DSLAM system of multiway xDSL access, and discloses a probe modulation method for eliminating remote end crosstalk of a channel in a DSLAM system, an error feedback method, a crosstalk cancellation coefficient obtaining method, a corresponding network side device, a user side device, a vectorization control entity, and the DSLAM system. The method comprises: calculating, according to a superframe structure parameter and an error feedback parameter of a DSLAM system, the number N of superframes required by an error detected by an uplink feedback on a downlink probe symbol; modulating, according to the calculated N, each probe element of a probe sequence to a downlink probe symbol of M consecutive superframes; and by using a detected error fed back by an uplink symbol occupying a maximum of C consecutive superframes on a downlink probe symbol, enabling error feedbacks orderly follow the probe modulation and fully feeding back an error on a probe symbol corresponding to the whole probe sequence.

Description

Probe modulation method, error feedback method, and corresponding device and system

Detect modulator approach, error feedback method and relevant device and system

Technical field

[01] the invention belongs to the communications field, it is related to offer multichannel xDSL (Digital Subscriber Line, digital subscriber line）DSLAM (DSL Access Multiplexer, the DSL couple in multiplexers of access）A kind of system, and in particular to detection modulator approach, error feedback method and corresponding network side equipment, user side equipment, vector quantization controlled entity and DSLAM systems for being used to eliminate the FEXT of the channel in DSLAM systems.Background technology

[02] xDSL is in UTP（Unshielded Twist Pair, UTP) on high speed transmission data technology.Except SHDSL (Symmetric High bit rate DSL, symmetrical high-speed DSL) and IDSL (Integrated Service Digital Network D SL, DSL based on ISDN) etc. outside the DSL of base band transmission, the xDSL of pass band transfer passes through frequency multiplexing technique and POTS (Plain Old Telephone Service, Plain Old Telephone Service）Coexist in on a pair of twisted-pair feeders, wherein xDSL occupies high band, POTS takes below 4KHz baseband portions, and POTS signals are separated with xDSL signals by separator.

[03] xDSL of pass band transfer uses DMT (Discrete Multi-Tone, Discrete Multitone Modulation）.Fig. 1 shows DMT superframes（Superf me) structure.As shown in figure 1,1 DMT superframe includes 256 data frames（Data frame) and 1 detection symbol（probe symbol).Wherein, detection symbol is mainly used in sounding channel, corresponding to standard G.993.2 and G.993.5 in synchronization frame（sync f me).

[04] system for providing multichannel xDSL accesses is called DSLAM systems.Fig. 2 shows DSLAM system reference model, wherein：XTU represents xDSL transceiver units；XTU-0 is represented in ONU (Optical Network Unit, optical network unit）On xTU, i.e. loop operator end, can centered on office, interchanger, machine the network side equipment such as refuse；XTU-R represents the user terminal of the xTU of distal end, i.e. loop, can be home-use Modem (modulation Demodulator）, the user side equipment such as wireless router.

[05] due to electromagnetic induction principle, so-called cross-talk can mutually be produced between the multiple signals of DSLAM accesses（Crosstalk) disturb.Cross-talk includes the near-end crosstalk (Near End Cross-Talk, NEXT) as shown in Fig. 3 a and FEXT as shown in Figure 3 b（Far End Cross-Talk , FEXT).Wherein, because xDSL up-downgoings channel uses frequency division multiplexing or time division multiplexing, near-end crosstalk will not generally produce too big harm to systematic function.But, as the frequency range that xDSL is used is more and more wider, FEXT more severely impacts the transmission performance of circuit, reduction channel speed.For example, when having multichannel user to require in a bundle cable to open xDSL business, FEXT can make that some line speeds are low, performance is unstable, can not even open, and ultimately result in DSLAM line activation rate than relatively low.

[06] industry proposes vector quantization at present（Vectoring) technology, it is mainly by carrying out combined transceiving at DSLAM ends as shown in figures 4 a and 4b and being eliminated using signal processing method per the FEXT in signal all the way.

[07] specifically, the shared channel H shown in Fig. 4 a and Fig. 4 b can be expressed as matrix form on k-th of subcarrier of frequency domain：

H =

[08] be from line to line to ' ' transmission equation.In a practical situation, with it is equal and be equal in shared channel H the channel number mutually with crosstalk relationships, M is set to herein, then H is the channel transfer matrices of one.The channel input vector that X is a Mx l is set respectively again, and Υ is the channel output vector of one, and n is Mx l noise vector.Finally, shared channel H transmission equation is expressed as：

y ^{= Hx + n}(formula 2)

[09] as shown in fig. 4 a, for up, the joint reception processing of signal is carried out at DSLAM ends and a crosstalk cancellation device W is introduced so that terminating the signal that receives in D S L A M is： =Wy=WHx+Wn (formula 3)

[10] obviously, when H is diagonal matrix, cross-talk can be eliminated.

[1 1] on the other hand, as shown in Figure 4 b, for descending, the joint that signal is carried out at DSLAM ends sends and handles and introduce a vector precoder P so that the signal sent at DSLAM ends is：

X=Px (formula 4)

[12] correspondingly, the signal that receives of xTU-R terminations is：

Y=H+n=HPx+n (formula 5)

[13] obviously, when HP is diagonal matrix, cross-talk can be eliminated.

[14] by carrying out Combined Treatment to uplink and downlink signals at DSLAM ends, vector technology can eliminate FEXT.Also, in order to eliminate FEXT using vector technology, industry typically adopts with the following method to obtain crosstalk cancellation coefficient.

[15] in the initial phase of circuit, first by VCE (the Vectoring Control Entity, vector quantization controlled entity at DSLAM ends）Each one detection sequence of xTU-0 port assignments is given according to certain rule（Probe Sequence).Detection sequence is used for modulation detection symbol (Probe Symbol), by a string of 0,1 bits（Bit) constitute, wherein constituting a detection element per a bit, the detection element detects corresponding modulating on symbol at one, and when a is equal to 1, each bit just constitutes a detection element.In G.993.5 standard, the detection sequence is pilot frequency sequence（Pilot Sequence), the detection symbol is synchronizing symbol（Sync Symbol), and a is equal to 1, i.e., and each bit is modulated at all detection subcarriers of a synchronizing symbol（Probe Tone) on.

[16] go on to say below so that each bit is constituted a detection element as an example and obtain cross-talk 4 third constellations and disappear the method for coefficient.Each detection element in detection sequence is modulated successively and cyclically in each xTU-0 ports on the detection symbol in DMT superframes as shown in Figure 1, and sends the DMT superframes for including the detection symbol after modulating.Then, xTU-R measurements are by detecting symbol relative to expected result after the modulation received by channel（For example, being passed via preferably undistorted channel Defeated result）Error, and measured error is expressed as passing through after error information in a predetermined format VCE is fed back to by xTU-0.Finally, VCE calculates crosstalk cancellation coefficient based on received error information.

[17] in above-mentioned crosstalk cancellation coefficient acquisition methods, each detection element in detection sequence is sequentially modulated on detection symbol by each xTU-0 ports.If this to represent the upstream message data-carrying capacity beyond a superframe in an error information amount detected on symbol needed for the error measured, error feedback will be unable to the time sequential routine for following detection to modulate.In this case, or selection, which makes xTU-R Lost abandon a part, is directed to the error detected measured by symbol received during uplink feedback error information, to cause error feedback that detection can be followed to modulate；Selection increase xTU-R Slow storages, by the error information of uplink feedback in need store and progressively send.Obviously, former selection will reduce error precision, and latter selection will increase resource consumption.The content of the invention

Technical problem

[18] in view of this, the technical problem to be solved in the present invention is how to carry out detection modulation and error feedback in an orderly manner, with can economy the FEXT of channel is eliminated using vector technology exactly.

Solution

In order to solve the above-mentioned technical problem, embodiments in accordance with the present invention detect modulator approach there is provided one kind, and it can be applied to include the system of network side equipment and user side equipment, and including：The network side equipment receives detection sequence；And each detection element in the detection sequence is modulated the network side equipment and each detection element is modulated on the descending detection symbol of continuous N superframe.Wherein, the detection sequence includes a string of 0,1 bits, and 1 detection element is constituted per a bit, a is the integer more than or equal to 1, and M is the integer more than or equal to N, N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol. For above-mentioned detection modulator approach, in a kind of possible implementation, the operation that the network side equipment is modulated to each detection element in the detection sequence and each detection element is modulated on the descending detection symbol of continuous N superframe is at least repeated once.

For above-mentioned detection modulator approach, in a kind of possible implementation, each detection element in the detection sequence is modulated in the network side equipment and each detection element is modulated in the operation on the descending detection symbol of continuous N superframe, the superframe modulated by the network side equipment is identical by the superframe of other network side equipments modulation in the DSLAM systems with synchronization.

For above-mentioned detection modulator approach, in a kind of possible implementation, in addition to：The network side equipment makes the pattern that there is the descending detection symbol of k-th of superframe in each continuous N superframe structure to fix.Wherein, k is the integer more than or equal to 1 and less than or equal to M.

For above-mentioned detection modulator approach, in a kind of possible implementation, in addition to：The network side equipment receives the value for the M that vector quantization controlled entity VCE is sended over, and the value of the M is notified to the user side equipment.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of network side equipment, it can be applied to include the system of the network side equipment and user side equipment, and including：Communication interface, for being communicated with the user side equipment by superframe；Memory, for storage program and/or data；And processor, it is connected with the communication interface and the memory, for running described program, to cause the network side equipment to perform above-mentioned detection modulator approach.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of network side equipment, it can be applied to include the system of the network side equipment and user side equipment, and including：Unit 10, for receiving detection sequence；Modulating unit, is connected with Unit 10 and the communication unit, for being modulated to each detection element in the detection sequence and each detection element is modulated at continuous N superframe On descending detection symbol；And communication unit, for being communicated with the user side equipment by superframe.Wherein, the detection sequence includes a string of 0,1 bits, and 1 detection element is constituted per a bit, a is the integer more than or equal to 1, and M is the integer more than or equal to N, N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

For above-mentioned network side equipment, in a kind of possible implementation, also include the cycling element that be connected with the modulating unit, the cycling element is used to making the modulating unit to repeat to be modulated each detection element in the detection sequence and each described detects operation that element is modulated on the descending detection symbol of continuous N superframe at least one times.

For above-mentioned network side equipment, in a kind of possible implementation, also include the synchronization unit being connected with the modulating unit, the synchronization unit is used to be modulated each detection element in the detection sequence in the modulating unit and each detection element is modulated in the operation on the descending detection symbol of continuous N superframe, makes the superframe modulated by the modulating unit identical with the superframe that synchronization is modulated by other network side equipments.

For above-mentioned network side equipment, in a kind of possible implementation, also include the indexing unit being connected with the modulating unit, the indexing unit is used for the pattern for making the descending detection symbol of k-th of superframe in each continuous N superframe that there is structure to fix.Wherein, k is the integer more than or equal to 1 and less than or equal to M.

For above-mentioned network side equipment, in a kind of possible implementation, Unit 10 is additionally operable to receive the value for the M that VCE is sended over, and the communication unit is additionally operable to notify the value of the M to the user side equipment.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of network side equipment, it can be applied to include the system of the network side equipment and user side equipment, and including：Communication interface, for being communicated with the user side equipment by superframe；10 interfaces, for receiving detection sequence；And processor, it is connected with 10 interface, for the descending detection symbol being modulated to each detection element in the detection sequence and each the detection element is modulated at continuous N superframe.Wherein, institute Stating detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1；M is the integer more than or equal to N；N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

For above-mentioned network side equipment, in a kind of possible implementation, the processor is additionally operable to repeat to be modulated each detection element in the detection sequence and each detection element is modulated at operation on the descending detection symbol of continuous N superframe at least one times.

For above-mentioned network side equipment, in a kind of possible implementation, the processor is additionally operable to be modulated in each detection element in the detection sequence and each detection element is modulated in the operation on the descending detection symbol of continuous N superframe, makes the superframe modulated by the processor identical with the superframe that synchronization is modulated by other network side equipments.

For above-mentioned network side equipment, in a kind of possible implementation, the processor is additionally operable to the pattern for making the descending detection symbol of k-th of superframe in each continuous N superframe that there is structure to fix.Wherein, k is the integer more than or equal to 1 and less than or equal to M.

For above-mentioned network side equipment, in a kind of possible implementation, 10 interface is additionally operable to receive the value for the M that VCE is sended over, and the communication interface is additionally operable to notify the value of the M to the user side equipment.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of error feedback method, it can be applied to include the system of network side equipment and user side equipment, and including：The user side equipment calculates the statistical average for the error measured on the descending detection symbol of the L superframe in continuous N superframe；And the user side equipment utilizes the error information at most accounting for statistical average described in the uplink symbol feedback representation of the continuous up duration of C superframe.Wherein, the descending detection symbol of the continuous N superframe is modulated by the same detection element in the network side equipment detection sequence；The detection sequence includes a string 0,1 bits, and constitutes per a bit 1 detection element, a be more than or Integer equal to 1；L is the integer more than or equal to 1 and less than or equal to M；C is the integer more than or equal to N and less than or equal to M；M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

For above-mentioned error feedback method, in a kind of possible implementation, in addition to：There is the user side equipment superframe of the pattern of structure fixation to position the continuous N superframe according to descending detection symbol.

For above-mentioned error feedback method, in a kind of possible implementation, in addition to：The user side equipment receives the value for the M that the network side equipment is notified, and the value based on the M and itself N value determine or updated the C and/or the L value.Wherein, the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that the user side equipment is accessed based on itself are calculated.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of user side equipment, it can be applied to the system for including network side equipment and the user side equipment, and including：Communication interface, for being communicated with the network side equipment by superframe；Memory, for storage program and/or data；And processor, it is connected with the communication interface and the memory, for running described program, to cause the user side equipment to perform above-mentioned error feedback method.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of user side equipment, it can be applied to the system for including network side equipment and the user side equipment, and including：Communication unit, for being communicated with the network side equipment by superframe；Computing unit, is connected with the communication unit, the statistical average for the error measured on the descending detection symbol for calculating the L superframe in continuous N superframe；And load sharing unit, it is connected with the computing unit and the communication unit, the error information for representing the statistical average using the uplink symbol carrying at most accounting for the continuous up duration of C superframe.Wherein, the descending detection symbol of the continuous N superframe is modulated by the same detection element in the network side equipment detection sequence；The detection sequence includes a string 0,1 Bit, and 1 detection element is constituted per a bit, a is the integer more than or equal to 1；L is the integer more than or equal to 1 and less than or equal to M；C is the integer more than or equal to N and less than or equal to M；And M is the integer more than or equal to N, N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

For above-mentioned user side equipment, in a kind of possible implementation, also include the positioning unit being connected with the communication unit and the computing unit, the positioning unit is used to the superframe for the pattern that according to descending detection symbol there is structure to fix position the continuous N superframe.

For above-mentioned user side equipment, in a kind of possible implementation, also include the definite value unit being connected with the communication unit, the computing unit and the load sharing unit, the communication unit is additionally operable to receive the value for the M that the network side equipment is notified, and the definite value unit determines or updated the C and/or the L value for value and itself N value based on the M.Wherein, the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that the definite value unit itself is accessed based on the user side equipment are calculated.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of user side equipment, it can be applied to the system for including network side equipment and the user side equipment, and including：Communication interface, for being communicated with the network side equipment by superframe；And processor, it is connected with the communication interface, the statistical average for the error measured on descending detection symbol for calculating the L superframe in continuous N superframe, and utilize the error information for the uplink symbol carrying expression statistical average at most accounting for the continuous up duration of C superframe.Wherein, the descending detection symbol of the continuous N superframe is modulated by the same detection element in the network side equipment detection sequence；The detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1；L is the integer more than or equal to 1 and less than or equal to M；C is the integer more than or equal to N and less than or equal to M；M is the integer more than or equal to N, and N represents described Superframe number needed for the error that user side equipment uplink feedback is measured on 1 descending detection symbol.

For above-mentioned user side equipment, in a kind of possible implementation, the processor is additionally operable to the superframe for the pattern that according to descending detection symbol there is structure to fix to position the continuous N superframe.

For above-mentioned user side equipment, in a kind of possible implementation, the communication interface is additionally operable to receive the value for the M that the network side equipment is notified, and the processor is additionally operable to value based on the M and itself N value and determines or update the C and/or L value.Wherein, the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that the processor itself is accessed based on the user side equipment are calculated.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of crosstalk cancellation coefficient acquisition methods, it can be applied to the DSLAM systems for including VCE, network side equipment and user side equipment, and including：The VCE distributes detection sequence to the network side equipment；Superframe structure parameter and error feedback parameter of the VCE based on each channel in the DSLAM systems calculate N value, and the value based on the N determines M value, and the value of the M is notified to the network side equipment；And the VCE receives the error information fed back by the uplink symbol at most accounting for the continuous up duration of C superframe from the network side equipment, the error information that the uplink symbol that the continuous up duration of C superframe is at most accounted for by described is fed back is combined into error information corresponding with 1 descending detection symbol, and crosstalk cancellation coefficient is calculated based on combined error information.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1；C is the integer more than or equal to N and less than or equal to M；N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe；M represents descending detection symbol by number of the network side equipment to the continuous superframe of the same detection element modulation in the detection sequence, and M is the integer more than or equal to N. For above-mentioned crosstalk cancellation coefficient acquisition methods, in a kind of possible implementation, in the case that the dual-mode of the transceiver in the DSLAM systems is time division duplex, the superframe structure parameter includes：The bit number for the message data that the number for the frame that each superframe is included, the number for the uplink symbol that each frame is included, and each uplink symbol can be carried.

For above-mentioned crosstalk cancellation coefficient acquisition methods, in a kind of possible implementation, in the case that the dual-mode of the transceiver in the DSLAM systems is FDD, the superframe structure parameter includes：The number for the symbol that each superframe is included, and each symbol can carry it is up disappear, the bit number of data.

For above-mentioned crosstalk cancellation coefficient acquisition methods, in a kind of possible implementation, the error feedback parameter includes：Disappearing needed for message is encapsulated, the expectation bit number of expense are carried out to uplink feedback error information；The number of the vector quantization frequency band of feedback error the need for each descending detection symbol is included；The number of the subcarrier of feedback error the need for each vector quantization frequency band is included；And represent bit number needed for the error measured on each subcarrier for needing feedback error.

For above-mentioned crosstalk cancellation coefficient acquisition methods, in a kind of possible implementation, in addition to：The VCE monitors the change of the channel in the DSLAM systems, and in newly-built or erasure channel in detecting the DSLAM systems, again superframe structure parameter and error feedback parameter based on each channel current in the DSLAM systems calculate the value of the N, and the value based on the N redefines the value of the M.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of VCE, it can be applied to the DSLAM systems for including the VCE, network side equipment and user side equipment, and including：10 interfaces, for being connected with the network side equipment；Memory, for storage program and/or data；And processor, it is connected with 10 interface and the memory, for running described program, to cause the VCE to perform above-mentioned crosstalk cancellation coefficient acquisition methods.

In order to solve the above-mentioned technical problem, there is provided one according to another embodiment of the present invention Kind of VCE, it can be applied to the DSLAM systems for including the VCE, network side equipment and user side equipment, and including：Unit 10, are connected with the network side equipment；Allocation unit, is connected with Unit 10, and the network side equipment is sent to via Unit 10 for distributing detection sequence, and by the detection sequence distributed；Definite value unit, it is connected with Unit 10, N value is calculated for the superframe structure parameter based on each channel in the DSLAM systems and error feedback parameter, the value based on the N determines M value, and the value of the M is notified to the network side equipment via Unit 10；And computing unit, it is connected with Unit 10, for by the error information that the uplink symbol by most accounting for the continuous up duration of C superframe received via Unit 10 from the network side equipment is fed back be combined into 1 corresponding error information of descending detection symbol, and crosstalk cancellation coefficient is calculated based on combined error information.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1；C is the integer more than or equal to N and less than or equal to M；N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe；M represents descending detection symbol by number of the network side equipment to the continuous superframe of the same detection element modulation in the detection sequence, and M is the integer more than or equal to N.

For above-mentioned VCE, in a kind of possible implementation, in addition to the monitoring unit being connected with the definite value unit, change of the monitoring unit for monitoring the channel in the DSLAM systems；And the definite value unit is additionally operable in newly-built or erasure channel during the monitoring unit detects the DSLAM systems, again superframe structure parameter and error feedback parameter based on each channel current in the DSLAM systems calculate the value of the N, and the value based on the N redefines the value of the M.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of VCE, it can be applied to the DSLAM systems for including the VCE, network side equipment and user side equipment, and including：Processor, for distributing detection sequence, superframe structure parameter and error based on each channel in the DSLAM systems to the network side equipment Feedback parameter calculates N value, and the value based on the N determines M value；And 10 interfaces, it is connected with the processor, for the value of the detection sequence and the M to be notified to the network side equipment, and the error information fed back by the uplink symbol at most accounting for the continuous up duration of C superframe is received from the network side equipment.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1；The processor is additionally operable to the error information that the uplink symbol at most accounting for the continuous up duration of C superframe by described is fed back being combined into error information corresponding with 1 descending detection symbol, and calculates crosstalk cancellation coefficient based on combined error information；C is the integer more than or equal to N and less than or equal to M；N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe；M represents descending detection symbol by number of the network side equipment to the continuous superframe of the same detection element modulation in the detection sequence, and M is the integer more than or equal to N.

For above-mentioned VCE, in a kind of possible implementation, the processor is additionally operable to monitor the change of the channel in the DSLAM systems, and in newly-built or erasure channel in detecting the DSLAM systems, again superframe structure parameter and error feedback parameter based on each channel current in the DSLAM systems calculate the value of the N, and the value based on the N redefines the value of the M.

For above-mentioned VCE, in a kind of possible implementation, in the case that the dual-mode of the transceiver in the DSLAM systems is time division duplex, the superframe structure parameter includes：What the number for the frame that each superframe is included, the number for the uplink symbol that each frame is included, and each uplink symbol can be carried disappears, the bit number of data.

For above-mentioned VCE, in a kind of possible implementation, in the case that the dual-mode of the transceiver in the DSLAM systems is FDD, the superframe structure parameter includes：The number for the symbol that each superframe is included, and each symbol can carry it is up disappear, the bit number of data.

For above-mentioned VCE, in a kind of possible implementation, the error feedback parameter Including：The expectation bit number of the required message overhead of message encapsulation is carried out to uplink feedback error information；The number of the vector quantization frequency band of feedback error the need for each descending detection symbol is included；The number of the subcarrier of feedback error the need for each vector quantization frequency band is included；And represent bit number needed for the error measured on each subcarrier for needing feedback error.

In order to solve the above-mentioned technical problem, according to another embodiment of the present invention there is provided a kind of DSLAM systems, it includes：Above-mentioned VCE, at least two above-mentioned network side equipments；And at least two above-mentioned user side equipments；Detection sequence is sent to the network side equipment by wherein described VCE, and M value is sent into the network side equipment and user side equipment.

Invention beneficial effect

[19] the superframe number N needed for calculating the error that uplink feedback is measured on a descending detection symbol by the superframe structure parameter according to D S L A M systems and error feedback parameter, each detection element of detection sequence is modulated on the descending detection symbol of each continuous N superframe based on the N calculated, and the error measured using the uplink symbol feedback at most accounting for the continuous up duration of C superframe on a descending detection symbol, the detection modulator approach provided according to embodiments of the present invention, error feedback method, crosstalk cancellation coefficient acquisition methods and corresponding network side equipment, user side equipment, vector quantization controlled entity and DSLAM systems, in the case of needing to use multiple superframes to carry out the error that uplink feedback is measured on a descending detection symbol, also error feedback can be made to follow detection to modulate in an orderly manner and completely feed back the error on the detection symbol corresponding to whole detection sequence, area is deposited without increase Slow.

[20] according to below with reference to the accompanying drawings to detailed description of illustrative embodiments, further feature and aspect of the invention will be clear.Brief description of the drawings

[21] accompanying drawing for including in the description and constituting a part for specification together illustrates exemplary embodiment, feature and the aspect of the present invention with specification, and for explaining this hair Bright principle.

Fig. 1 shows the structural representation of DMT superframes；

Fig. 2 shows the schematic diagram of DSLAM system reference model；

Fig. 3 a show the generation principle schematic of the near-end crosstalk between the multiple signals of DSLAM accesses；

Fig. 3 b show the generation principle schematic of the FEXT between the multiple signals of DSLAM accesses；

Fig. 4 a show that joint is carried out at DSLAM ends to be received to eliminate the system architecture schematic diagram of FEXT；

Fig. 4 b show that joint is carried out at DSLAM ends to be sent to eliminate the system architecture schematic diagram of FEXT；

Fig. 5 shows the flow chart of detection modulator approach according to an embodiment of the invention, error feedback method and crosstalk cancellation coefficient acquisition methods；

Fig. 6 a 6c are shown by detection modulator approach according to an embodiment of the invention, error feedback method and crosstalk cancellation coefficient acquisition methods so that the superframe flow diagram that error feedback can follow detection to modulate in an orderly manner；

Fig. 7 shows the flow chart of detection modulator approach according to another embodiment of the present invention, error feedback method and crosstalk cancellation coefficient acquisition methods；

Fig. 8 shows the structured flowchart of network side equipment according to an embodiment of the invention；Fig. 9 shows the structured flowchart of network side equipment according to another embodiment of the present invention；Figure 10 shows the structured flowchart of the network side equipment according to further embodiment of this invention；Fig. 11 shows the structured flowchart of user side equipment according to an embodiment of the invention；Figure 12 shows the structured flowchart of user side equipment according to another embodiment of the present invention；Figure 13 shows the structured flowchart of the user side equipment according to further embodiment of this invention；Figure 14 shows VCE according to an embodiment of the invention structured flowchart；

Figure 15 shows VCE according to another embodiment of the present invention structured flowchart；

Figure 16 shows the structured flowchart of the VCE according to further embodiment of this invention； Figure 17 shows the schematic diagram of packet detection modulation according to an embodiment of the invention；And Figure 18 shows the schematic diagram of packet detection modulation according to another embodiment of the present invention.Figure 19 shows the flow chart according to the detection modulator approach of further embodiment of this invention, error feedback method and crosstalk cancellation coefficient acquisition methods；

Figure 20 a 20c are shown by the detection modulator approach according to further embodiment of this invention, error feedback method and crosstalk cancellation coefficient acquisition methods so that the superframe flow diagram that error feedback can follow detection to modulate in an orderly manner；Embodiment

[22] various exemplary embodiments, feature and the aspect of the present invention is described in detail below with reference to accompanying drawing.Identical reference represents the same or analogous element of function in accompanying drawing.Although the various aspects of embodiment are shown in the drawings, unless otherwise indicated, it is not necessary to accompanying drawing drawn to scale.

[23] special word " exemplary " is meant " being used as example, embodiment or illustrative " herein.Here as " exemplary " illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.

[24] in addition, in order to better illustrate the present invention, numerous details are given in embodiment below.It will be appreciated by those skilled in the art that without these details, the present invention can equally be implemented.In other example, it is not described in detail for known method, means, element and circuit, in order to highlight the purport of the present invention.

Embodiment 1

[25] Fig. 5 shows the flow chart of detection modulator approach according to an embodiment of the invention, error feedback method and crosstalk cancellation coefficient acquisition methods.As shown in figure 5, can be applied to include the DSLAM systems of VCE, network side equipment and user side equipment according to the method for this embodiment of the invention, and including：

[26] when the circuit in DSLAM systems is initialized, superframe structure parameter and error feedback parameter of the VCE based on each channel in the D S L A M systems calculate N's Value and value based on the N determine M value（1) S5 1, then notifies the value of the M to the network side equipment.Wherein, N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe.M represents that descending detection symbol is utilized the number of the continuous superframe of the same detection element modulation in detection sequence by the network side equipment, and M is the integer more than or equal to N.The detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1.

[27] this is based on, the network side equipment records the value of the M（S521), and by the value of the M notify to the user side equipment.

[28] correspondingly, value of the user side equipment based on the received M and itself N value determine C and L value（S53 1).Wherein, the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that the user side equipment is connected based on itself are calculated.C is the integer more than or equal to N and less than or equal to M, and L is the integer more than or equal to 1 and less than or equal to M.

[29] on the other hand, the VCE distributes detection sequence to the network side equipment（S512), and by the detection sequence distributed it is sent to the network side equipment.

[30] it is based on this, the network side equipment is modulated to each detection element in the detection sequence after the detection sequence of the VCE distribution is received and each detection element is modulated on the descending detection symbol of continuous N superframe（S522), and by the superframe after modulation it is sent to the user side equipment.Wherein, the descending detection symbol for the M superframe that different detection elements is modulated at is different；In addition in a kind of possible implementation, each detection element in the detection sequence is modulated in the network side equipment and each the detection element is modulated at the operation on the descending detection symbol of continuous N superframe（S522 in), the superframe modulated by the network side equipment is identical by the superframe of other network side equipments modulation in the DSLAM systems with synchronization.So, because all circuits carry out repeating modulation using the detection element of respective detection sequence to M descending detection symbols mutually in the same time respectively, this make it that the cross-talk on M descending detection symbols caused by circuit is of equal value, so as to ensure the degree of accuracy of crosstalk cancellation coefficient. [3 1] correspondingly, the user side equipment calculates the statistical average for the error measured on the descending detection symbol of the L superframe in the continuous N superframe（S532), and using at most accounting for the error information of statistical average described in the uplink symbol feedback representation of the continuous up duration of C superframe（S533).Wherein, in the case where L is equal to 1, the L superframe can be any one superframe in the M superframe.In the case where L is more than or equal to 2, the L superframe can be continuous or multiple superframes discontinuously in the M superframe.The uplink symbol at most accounting for the continuous up duration of C superframe can be uplink symbol since the uplink symbol of continuous multiple superframes the head of some superframe or continuous multiple superframes since any pars intermedia of some superframe.

[32] so, the error information fed back by the uplink symbol at most accounting for the continuous up duration of C superframe can be combined into after the error information that the uplink symbol at most accounting for the continuous up duration of C superframe by described is fed back is received via the network side equipment and descending detect the corresponding error information of symbol with 1 by the VCE（S513), and based on combined error information crosstalk cancellation coefficient is calculated（ S 514 ).In the case where C is more than M caused by some are expected because message overhead exceedes, user side equipment will terminate this feedback error data, and enter the feedback of measurement error next time.

[33] Fig. 6 a 6c show to carry out the superframe flow diagram that detection modulation and error are fed back by method shown in Fig. 5.It is clearly visible, by modulating continuous N superframe using same detection element in network side equipment, and the error information measured in user side equipment using the uplink symbol feedback at most accounting for the continuous up duration of C superframe on 1 descending detection symbol, the above method according to an embodiment of the invention enables to the error feedback of user side equipment to follow the detection of network side equipment to modulate in an orderly manner, in the case of needing to use multiple superframes to carry out the error that uplink feedback is measured on a descending detection symbol, also can economy calculate the third constellations of cross-talk 4 of D SLAM systems exactly and disappear coefficient.

[34] need what is illustrated, although step S51 1 is shown as into the progress before step S512 in Fig. 5, but the invention is not restricted to this, those skilled in the art will be understood that step S5 11 also can simultaneously be carried out after step S512 or with step S512. [35] in addition, although in order to which simplified illustration illustrate only a detection modulation for detecting element and error feedback in Fig. 5, but those skilled in the art will be understood that, in actually implementing, each detection element in detection sequence will be modulated, to ensure that the user side equipment at least feeds back the error on all detection symbols corresponding to a complete detection sequence.Also, in a kind of possible implementation, the network side equipment is modulated to each detection element in the detection sequence and each the detection element is modulated at the operation on the descending detection symbol of continuous N superframe（S522) at least it is repeated once.So, carry out repeatedly detection by using same detection sequence to modulate, crosstalk cancellation coefficient is constantly calculated or update using the error feedback repeatedly obtained, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

[36] in a kind of possible implementation, the dual-mode of the transceiver in the DSLAM systems is time division duplex（TDD in the case of), the superframe structure parameter may include：The number for the TTD frames that each superframe is included《, what the number for the uplink symbol that each frame is included and each uplink symbol can be carried disappears, the bit number χ of data.The error feedback parameter may include：The expectation bit number ζ of the required message overhead of message encapsulation is carried out to uplink feedback error information；The vector quantization frequency band of feedback error the need for each descending detection symbol is included（Vectored Band) number, the bit number needed for the error that the number of the subcarrier of feedback error and expression are measured on each subcarrier for needing feedback error of k-th of vector quantization frequency band the need for the vector quantization frequency band is included.Also, the VCE can calculate the value of the N using formula below 6, the number wherein expression of " " 1 α rounds up.

Factory

Ν (formula 6) nbx

[37] for example, for TDD G. fast systems, a typical superframe includes 8 TDD frames, each tdd frame includes 35 symbols and two protection time slots（Guard time, for separated uplink and downlink, the two guard time duration totally 1 symbol）, it is assumed that each TDD Frame in has 7 uplink symbols, and each uplink symbol can carry 286 bit message data.G. fast is using 106MHz profile (templates）When each detection symbol there is nearly 2048 subcarriers, it is assumed that the error of 2000 subcarriers on one detection symbol of measurement, and assume that the error of each subcarrier uses 16 bit.Simultaneously, it is assumed that the expectation message overhead that each uplink feedback error information needs is 8 bit.In this case, the VCE will calculate N equal to 2.

[38] in alternatively possible implementation, the dual-mode of the transceiver in the DSLAM systems is FDD（FDD in the case of), the superframe structure parameter may include：The number 6 for the symbol that each superframe is included, and each bit number x for the upstream message data that the symbol can be carried.The error feedback parameter may include：Uplink feedback error information is disappeared, disappearing needed for encapsulation, the expectation bit number ζ of expense；The vector quantization frequency band of feedback error the need for each descending detection symbol is included（Vectored Band) number, the number of the subcarrier of feedback error the need for the vector quantization frequency band is included;And represent bit number 3^ needed for the error measured on each subcarrier for needing feedback error of the vector quantization frequency band.Also, the VCE can calculate the value of the N using formula below 7, wherein "_α] represent_ΩRound up number.

[39] it should be noted that when VCE calculates the value of the N using above-mentioned formula 6 or formula 7, in the case where DSLAM systems include 1 channel, using the N values gone out for the channel calculation as whole DSLAM systems N values；And in the case where DSLAM systems include multiple channels, each channel calculation N values will be then directed to, and follow the detection of network side equipment to modulate in an orderly manner to ensure that the error of all user side equipments is fed back as the N values of whole DSLAM systems preferably using maximum N values.In addition, it is described message encapsulation is carried out to uplink feedback error information needed for the expectation bit number z of message overhead refer to disappear to uplink feedback error information, encapsulation is a desired value of message overhead, in some encapsulation format this Desired value may be different with actual overhead value.Such as, in the encapsulation format similar to HDLC, due to the processing of transparent byte（Octet transparency), different payloads（Payload the expense needed for) is different.In some cases, this desired value can be set as 0.

[40] in another possible implementation, each detection element in the detection sequence is modulated in the network side equipment and each the detection element is modulated at the operation on the descending detection symbol of continuous N superframe（S522 in), the superframe modulated by the network side equipment is identical by the superframe of other network side equipments modulation in the DSLAM systems with synchronization.So, because all circuits carry out repeating modulation using the detection element of respective detection sequence to M descending detection symbols mutually in the same time respectively, this make it that the cross-talk on M descending detection symbols caused by circuit is of equal value, so as to ensure the degree of accuracy of crosstalk cancellation coefficient.

[41] in another possible implementation, each detection element in the detection sequence is modulated in the network side equipment and each the detection element is modulated at the operation on the descending detection symbol of continuous N superframe（S522 in), the network side equipment can pass through predetermined mode, for example G.993.5 in be used for mark synchronizing symbol pattern (Pattern) mode, make k-th of superframe in each continuous N superframe descending detection symbol have structure fixation pattern.Wherein, k is the integer more than or equal to 1 and less than or equal to M.So, because the network side equipment makes the pattern that there is the descending detection symbol of some superframe in each continuous N superframe structure to fix, enable the user side equipment whether there is the pattern that structure is fixed to be accurately positioned the M superframe continuously modulated by same detection element according to descending detection symbol, so that the error feedback for being more conducive to the user side equipment follows the detection of the network side equipment to modulate in an orderly manner.

Embodiment 2

[42] Fig. 7 shows the flow chart of detection modulator approach according to another embodiment of the present invention, error feedback method and crosstalk cancellation coefficient acquisition methods.Label has identical function with Fig. 5 identical components in Fig. 7, and omits the explanation to these components.

[43] as shown in fig. 7, compared with the method shown in Fig. 5, the main distinction of method shown in Fig. 7 It is, the N, the M, the C and the L value are not static constant, but what dynamic changed.Wherein, so-called static state is constant to be referred to for example, when DSLAM systems start, VCE calculates the value of the N according to the superframe structure parameter and error feedback parameter of each channel and sets the value of the M, value of the user side equipment based on the M sets the value of the C and L, and it hereafter will carry out detection modulation, error feedback and crosstalk cancellation coefficient using the set M, the C and the L value always to obtain, until the DSLAM systems are closed or restarted.Refer to however, so-called dynamic changes, the N, the M, the C and the L value will follow the change of channel in DSLAM systems and change.

[44] specifically, the VCE monitors the change of the channel in the DSLAM systems to reference picture 7（S71 1), and in newly-built or erasure channel in detecting the DSLAM systems, again superframe structure parameter and error feedback parameter based on each channel current in the DSLAM systems calculate the value of the N, and the value based on the N redefines the value of the M（S712).Correspondingly, the network side equipment records the value of the M in the case where receiving the value for the M that the VCE is notified（S521) and by the value of the M notify to the user side equipment；And the user side equipment is in the case where receiving the value for the M that the network side equipment is notified, the value of value and itself N based on the M determines or updated the C and/or the L value（S73 1).Wherein, the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that the user side equipment is connected based on itself are calculated.

[45] so, due to the N, the M, the C and the L dynamically are adjusted into appropriate value in time according to the change of channel in the DSLAM systems, even if occurring in that channel is newly-built or eliminates in the DSLAM systems, it can also ensure that the error feedback of the user side equipment follows the detection of the network side equipment to modulate in an orderly manner, the detection modulator approach, error feedback method and crosstalk cancellation coefficient acquisition methods shown in Fig. 7 can further improve the degree of accuracy of crosstalk cancellation coefficient.

Embodiment 3 [46] Fig. 8 shows the structured flowchart of network side equipment according to an embodiment of the invention.As shown in figure 8, network side equipment 800 can be applied to include the DSLAM systems of VCE, network side equipment and user side equipment, and including 10 units 810, modulating unit 820 and communication unit 830.

[47] as shown in figure 8,10 units 810 are connected with VCE and modulating unit 820, it is mainly used in communicating with VCE, for example, receives the detection sequence of the VCE distribution and be sent to modulating unit 820.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1.

[48] modulating unit 820 is connected with 10 units 810 and communication unit 830, is mainly used in being modulated each detection element in the detection sequence and each detection element is modulated on the descending detection symbol of continuous N superframe.Wherein, M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

[49] communication unit 830 is connected with user side equipment and modulating unit 820, it is mainly used in being communicated by superframe with user side equipment, for example, is sent descending detection symbol to user side equipment using the superframe detected after element modulation by modulating unit 820.

[50] so, because modulating unit 820 modulates the descending detection symbol of continuous N superframe using same detection element, the user side equipment is enabled to utilize the uplink symbol feedback at most accounting for the continuous up duration of C superframe to detect the error measured on symbol at 1 according to the network side equipment 800 of this embodiment of the invention, ensure that the error feedback of user side equipment follows the detection of network side equipment 800 to modulate in an orderly manner, in the case of needing to use multiple superframes to carry out the error that uplink feedback is measured on a descending detection symbol, also can economy calculate the crosstalk cancellation coefficients of the DSLAM systems exactly.

[51] in a kind of possible implementation, as shown in figure 8, network side equipment 800 may also include cycling element 840.Cycling element 840 is connected with modulating unit 820, is mainly used in making modulating unit 820 repeat to be modulated each detection element in the detection sequence and each the detection element is modulated on the descending detection symbol of continuous N superframe Operation is at least one times.So, carry out repeatedly detection by using same detection sequence to modulate, crosstalk cancellation coefficient is constantly calculated or update using the error feedback repeatedly obtained, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

[52] in alternatively possible implementation, as shown in figure 8, network side equipment 800 may also include synchronization unit 850.Synchronization unit 850 is connected with modulating unit 820, it is mainly used in that each detection element in 820 pairs of detection sequences of modulating unit is modulated and each detection element is modulated in the operation on the descending detection symbol of continuous N superframe, makes the superframe modulated by modulating unit 820 identical with the superframe that synchronization is modulated by other network side equipments in the DSLAM systems.So, because all circuits carry out repeating modulation using the detection element of respective detection sequence to M descending detection symbols mutually in the same time respectively, this make it that the cross-talk on M descending detection symbols caused by circuit is of equal value, so as to ensure the degree of accuracy of crosstalk cancellation coefficient.

[53] in alternatively possible implementation, as shown in figure 8, network side equipment 800 may also include indexing unit 860.Indexing unit 860 is connected with modulating unit 820, is mainly used in by predetermined mode, for example G.993.5 in be used for the pattern that marks synchronizing symbol（Pattern mode), the pattern for making the descending detection symbol of k-th of superframe in each continuous N superframe that there is structure to fix.Wherein, k is the integer more than or equal to 1 and less than or equal to M.So, because indexing unit 860 makes the pattern that there is the descending detection symbol of some superframe in each continuous N superframe structure to fix, enable the user side equipment whether there is the pattern that structure is fixed to be accurately positioned the M superframe continuously modulated by same detection element according to descending detection symbol, so that the error feedback for being more conducive to the user side equipment follows the detection of network side equipment 800 to modulate in an orderly manner.

[54] in alternatively possible implementation, Unit 10 also receive the M of VCE notices value, and the value of the M is notified to modulating unit 820, while also notifying the value of the M to the user side equipment via communication unit 830.So, due to network side equipment 800 dynamically^:The blunt notice according to V C E updates the value of the M and notified via communication unit 830 to the user side equipment, even if occurring in that channel is newly-built in the DSLAM systems Or eliminate, it can also ensure that the error feedback of the user side equipment follows the detection of network side equipment 800 to modulate in an orderly manner, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

Embodiment 4

[55] Fig. 9 shows the structured flowchart of network side equipment according to another embodiment of the present invention.As shown in figure 9, network side equipment 900 can be applied to include the DSLAM systems of VCE, network side equipment and user side equipment, and including 10 interfaces 910, processor 920 and communication interface 930.

[56] wherein, as shown in figure 9,10 interfaces 910 are connected with shown VCE and processor 920, it is mainly used in communicating with the VCE, the detection sequence that the VCE distributes to network side equipment 900 is for example received, and received detection sequence is sent to processor 920.

[57] communication interface 930 is connected with user side equipment and processor 920, is mainly used in being communicated by superframe with the user side equipment.

[58] processor 920 is connected with 10 interfaces 910 and communication interface 930, is mainly used in being modulated each detection element in the detection sequence and each detection element is modulated on the descending detection symbol of continuous N superframe.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1.M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

[59] so, because processor 920 modulates the descending detection symbol of continuous N superframe using same detection element, the user side equipment is enabled to utilize the uplink symbol feedback at most accounting for the continuous up duration of C superframe to detect the error measured on symbol at 1 according to the network side equipment 900 of this embodiment of the invention, ensure that the error feedback of user side equipment follows the detection of network side equipment 900 to modulate in an orderly manner, in the case of needing to use multiple superframes to carry out the error that uplink feedback is measured on a descending detection symbol, also can economy calculate the crosstalk cancellation coefficients of the DSLAM systems exactly.

[60] in a kind of possible implementation, processor 920 can also be used to repeat to be modulated each detection element in the detection sequence and each detection element is modulated Operation on the descending detection symbol of continuous N superframe is at least one times.So, carry out repeatedly detection by using same detection sequence to modulate, crosstalk cancellation coefficient is constantly calculated or update using the error feedback repeatedly obtained, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

[61] in alternatively possible implementation, processor 920 can also be used to be modulated in each detection element in the detection sequence and each detection element is modulated in the operation on the descending detection symbol of continuous N superframe, make the superframe modulated by processor 920 identical by the superframe of other network side equipments modulation in the DSLAM systems with synchronization.So, because all circuits carry out repeating modulation using the detection element of respective detection sequence to M descending detection symbols mutually in the same time respectively, this make it that the cross-talk on M descending detection symbols caused by circuit is of equal value, so as to ensure the degree of accuracy of crosstalk cancellation coefficient.

[62] in alternatively possible implementation, processor 920 can be additionally used in by predetermined mode, for example G.993.5 in be used for the pattern that marks synchronizing symbol（Pattern mode), the pattern for making the descending detection symbol of k-th of superframe in each continuous N superframe that there is structure to fix.Wherein, k is the integer more than or equal to 1 and less than or equal to M.So, because processor 920 makes the pattern that there is the descending detection symbol of some superframe in each continuous N superframe structure to fix, enable the user side equipment whether there is the pattern that structure is fixed to be accurately positioned the M superframe continuously modulated by same detection element according to descending detection symbol, so that the error feedback for being more conducive to the user side equipment follows the detection of network side equipment 900 to modulate in an orderly manner.

[63] in alternatively possible implementation, processor 920 can also be used to, in the case where 10 interfaces 910 receive the M of V C E notices value, the user side equipment is given via communication interface 930 by the value of the M.So, because network side equipment 900 dynamically updates the value of the M according to the notice of the VCE and is notified via communication interface 930 to the user side equipment, even if occurring in that channel is newly-built or eliminates in the DSLAM systems, it can also ensure that the error feedback of the user side equipment follows network side equipment 900 in an orderly manner Detection modulation, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

Embodiment 5

[64] Figure 10 shows a kind of structured flowchart of network side equipment of further embodiment of this invention.The network side equipment 1000 can possess host server, personal computer PC or portable portable computer or terminal of computing capability etc..The specific embodiment of the invention is not limited implementing for calculate node.

[65] network side equipment 1000 includes processor 1010, communication interface 1020,10 (Input and Output, input and output）Interface 1030, memory 1040 and bus 1050.Wherein, processor 1010, communication interface 1020,10 interfaces 1030 and memory 1040 complete mutual communication by bus 1050.

[66] communication interface 1020 is used to communicate with the user side equipment in DSLAM systems.

[67] 10 interfaces 1030 are used to communicate with the VCE in DSLAM systems.

[68] memory 1040 is used to deposit program and/or data, and the program can be to include the program code of computer-managed instruction.Memory 1040 may include high-speed RAM memory, it is also possible to also including nonvolatile memory（Non- volatile memory), for example, at least one magnetic disk storage.Memory 1040 can also be memory array.Memory 1040 is also possible to by piecemeal, and described piece can be combined into virtual volume by certain rule.

[69] processor 1010 is used for program.Processor 1010 is probably a central processing unit

CPU, or application-specific integrated circuit ASIC (Application Specific Integrated

Circuit), or be arranged to implement the embodiment of the present invention one or more integrated circuits.

[70] in a kind of possible embodiment, processor 1010 causes the network side equipment 1000 to perform following operation by performing the program that memory 1040 is stored：The network side equipment receives the detection sequence of the VC E distribution；Wherein described detection sequence has VCE to send over；And each detection element in the detection sequence is modulated the network side equipment and each detection element is modulated on the descending detection symbol of continuous N superframe.Wherein, the detection sequence includes a string of 0,1 bits, and often A bit constitutes 1 detection element, and a is the integer more than or equal to 1；And, M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

Embodiment 6

[71] Figure 11 shows the structured flowchart of user side equipment according to an embodiment of the invention.As shown in figure 11, user side equipment 1100 can be applied to include the DSLAM systems of VCE, network side equipment and user side equipment, and including communication unit 1110, computing unit 1120 and load sharing unit 1130.

[72] wherein, as shown in figure 11, communication unit 1110 is connected with the network side equipment, computing unit 1120 and load sharing unit 1130, it is mainly used in being communicated by superframe with the network side equipment, for example, continuously receives descending detection symbol by M superframe of the same detection element modulation in the network side equipment detection sequence.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1.M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

[73] computing unit 1120 is connected with communication unit 1110 and load sharing unit 1130, is mainly used in calculating the statistical average for the error measured on the descending detection symbol of the L superframe in continuous N superframe.Wherein, L is the integer more than or equal to 1 and less than or equal to M.In the case where L is equal to 1, the L superframe can be any one superframe in the M superframe.In the case where L is more than or equal to 2, the L superframe can be continuous or multiple superframes discontinuously in the M superframe.

[74] load sharing unit 1130 is connected with computing unit 1120 and communication unit 1110, it is mainly used at most accounting for up be carried on of error information for representing the statistical average that computing unit 1120 is calculated in the uplink symbol of the continuous up duration of C superframe, and the network side equipment is given via the uplink feedback of communication unit 1110 by the C superframe.Wherein, C is the integer more than or equal to N and less than or equal to M.

[75] so, utilize same because load sharing unit 1130 is adapted to the network side equipment Detection element modulates continuous N superframe and utilizes the uplink symbol feedback at most accounting for the continuous up duration of C superframe to detect the error measured on symbol at 1, it can effectively ensure that the error feedback of user side equipment 1100 follows the detection of the network side equipment to modulate in an orderly manner, even in needing to use multiple superframes to carry out uplink feedback on a descending detection symbol in the case of the error measured, also can economy calculate the crosstalk cancellation coefficients of the DSLAM systems exactly.

[76] in a kind of possible implementation, user side equipment 1100 may also include positioning unit 1140.Positioning unit 1140 is connected with communication unit 1110 and computing unit 1120, whether the descending detection symbol being mainly used in the superframe according to received by communication unit 1110 has the pattern that structure is fixed to position the continuous N superframe, and positioning result is informed to computing unit 1120.So, because positioning unit 1140 can whether the pattern that there is structure to fix be accurately positioned the M superframe continuously modulated by same detection element according to descending detection symbol, it is more conducive to ensure that the error feedback of user side equipment 1100 follows the detection of the network side equipment to modulate in an orderly manner.

[77] in alternatively possible implementation, user side equipment 1100 may also include definite value unit 1150.Definite value unit 1150 is connected with communication unit 1110, computing unit 1120 and load sharing unit 1130, it is mainly used in the case where communication unit 1110 receives the value for the M that the network side equipment is notified, the value of value and itself N based on the M determines or updated the C and/or L value, and the ^1, the C and the L value are notified to computing unit 1120 and load sharing unit 1130.Wherein, the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that definite value unit 1150 itself is accessed based on user side equipment 1100 are calculated.So, because the C and/or the L dynamically can be adjusted to appropriate value by user side equipment 1100 in time by definite value unit 1150 according to the M of network side equipment notice value, even if occurring in that channel is newly-built or eliminates in the DSLAM systems, it can also ensure that the error feedback of user side equipment 1100 follows the detection of the network side equipment to modulate in an orderly manner, so as to further improve the degree of accuracy of crosstalk cancellation coefficient. Embodiment 7

[78] Figure 12 shows the structured flowchart of user side equipment according to another embodiment of the present invention.As shown in figure 12, user side equipment 1200 can be applied to include the DSLAM systems of VCE, network side equipment and user side equipment, and including communication interface 1210 and processor 1220.

[79] wherein, as shown in figure 12, communication interface 1210 is connected with the network side equipment and processor 1220, it is mainly used in being communicated by superframe with the network side equipment, for example, continuously receives descending detection symbol by M superframe of the same detection element modulation in the network side equipment detection sequence.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1.M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

[80] processor 1220 is connected with communication interface 1210, it is mainly used in calculating the statistical average for the error measured on the descending detection symbol of the L superframe in the continuous N superframe, and utilizes the error information for the uplink symbol carrying expression statistical average at most accounting for the continuous up duration of C superframe.Wherein, L is the integer more than or equal to 1 and less than or equal to M, and C is the integer more than or equal to N and less than or equal to M.In the case where L is equal to 1, the L superframe can be any one superframe in the M superframe.In the case where L is more than or equal to 2, the L superframe can be continuous or multiple superframes discontinuously in the M superframe.

[81] so, because processor 1220 is adapted to the error that the network side equipment utilizes the uplink symbol feedback at most accounting for the continuous up duration of C superframe to be measured on 1 detection symbol using same detection element modulation continuous N superframe, it can effectively ensure that the error feedback of user side equipment 1200 follows the detection of the network side equipment to modulate in an orderly manner, in the case of needing to use multiple superframes to carry out the error that uplink feedback is measured on a descending detection symbol, also can economy calculate the crosstalk cancellation coefficients of the DSLAM systems exactly.

[82] in a kind of possible implementation, processor 1220 can also be used to be connect according to communication Whether the descending detection symbol in superframe received by mouth 1210 has the pattern that structure is fixed to position the continuous N superframe, and positioning result is informed to computing unit 1 120.So, because processor 1220 can whether the pattern that there is structure to fix be accurately positioned the M superframe continuously modulated by same detection element according to descending detection symbol, it is more conducive to ensure that the error feedback of user side equipment 1200 follows the detection of the network side equipment to modulate in an orderly manner.

[83] in alternatively possible implementation, processor 1220 can be additionally used in the case where communication interface 1210 receives the value for the M that the network side equipment is notified, the value of value and itself N based on the M determines or updated the C and/or L value.Wherein, the value of itself N is the N value that calculates of superframe structure parameter and error feedback parameter for the channel that finger processor 1220 itself is accessed based on user side equipment 1200.So, because the C and/or the L dynamically can be adjusted to appropriate value by user side equipment 1200 in time by processor 1220 according to the M of network side equipment notice value, even if occurring in that channel is newly-built or eliminates in the DSLAM systems, it can also ensure that the error feedback of user side equipment 1200 follows the detection of the network side equipment to modulate in an orderly manner, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

Embodiment 8

[84] Figure 13 shows the structured flowchart of the user side equipment according to further embodiment of this invention.The user side equipment 1300 can possess host server, personal computer PC or portable portable computer or terminal of computing capability etc..The specific embodiment of the invention is not limited implementing for calculate node.

[85] user side equipment 1300 includes processor 13 10, communication interface 1320, memory 1330 and bus 1340.Wherein, processor 13 10, communication interface 1320 and memory 1330 complete mutual communication by bus 1340.

[86] communication interface 1320 is used to communicate with the network side equipment in DSLAM systems.

[87] memory 1330 is used to deposit program and/or data, and the program can be to include the program code of computer-managed instruction.Memory 1330 may include high-speed RAM memory, also may be used Nonvolatile memory can also be included（Non-volatile memory), for example, at least one magnetic disk storage.Memory 1330 can also be memory array.Memory 1330 is also possible to by piecemeal, and described piece can be combined into virtual volume by certain rule.

[88] processor 13 10 is used for program.Processor 13 10 is probably a central processing unit

[89] in a kind of possible embodiment, processor 13 10 causes the user side equipment 1300 to perform following operation by performing the program that memory 1330 is stored：The user side equipment calculates the statistical average for the error measured on the descending detection symbol of the L superframe in continuous N superframe；And, the user side equipment utilizes the error information at most accounting for statistical average described in the uplink symbol feedback representation of the continuous up duration of C superframe.Wherein, the descending detection symbol of the continuous N superframe is modulated by the same detection element in the network side equipment detection sequence；The detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1；L is the integer more than or equal to 1 and less than or equal to M；C is the integer more than or equal to N and less than or equal to M, and, M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

Embodiment 9

[90] Figure 14 shows VCE according to an embodiment of the invention structured flowchart.As shown in figure 14, vector quantization controlled entity VCE 1400 can be applied to include the DSLAM systems of the VCE, network side equipment and user side equipment, and including 10 units 1410, allocation unit 1420, definite value unit 1430 and computing unit 1440.

[91] wherein, as shown in figure 14,10 units 1410 are connected with the network side equipment and allocation unit 1420, definite value unit 1430 and computing unit 1440, are mainly used in being communicated with the network side equipment. [92] allocation unit 1420 is connected with 10 units 1410, is mainly used in distributing detection sequence, and the detection sequence distributed is sent into the network side equipment via 10 units 1410.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1.

[93] definite value unit 1430 is connected with 10 units 1410, it is mainly used in the value that superframe structure parameter and error feedback parameter based on each channel in the DSLAM systems calculate N, value based on the N determines the value of the M, and the value of the M is notified to the network side equipment via 10 units 1410.Wherein, N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe.M represents descending detection symbol by number of the network side equipment to the continuous superframe of the same detection element modulation in the detection sequence, and M is the integer more than or equal to N.

[94] in the case that the dual-mode of the transceiver also, in the DSLAM systems is time division duplex (TDD), the superframe structure parameter may include：The number for the TTD frames that each superframe is included《, the number 6 for the uplink symbol that each frame is included, and each bit number X for the message data that the uplink symbol can be carried.The error feedback parameter may include：Uplink feedback error is disappeared, disappearing needed for encapsulation, the vector quantization frequency band of feedback error the need for each descending detection symbol of expectation bit number of expense is included（Vectored Band) number, the bit number 3^ needed for the error that the number of the subcarrier of feedback error and expression are measured on each subcarrier for needing feedback error of the vector quantization frequency band the need for the vector quantization frequency band is included.Also, in a kind of possible implementation, definite value unit 1430 calculates the value of the N using formula 6 as above.

[95] on the other hand, the dual-mode of the transceiver in the DSLAM systems is FDD（FDD in the case of), the superframe structure parameter may include：The number 6 for the symbol that each superframe is included, and each bit number x for the upstream message data that the symbol can be carried.The error feedback parameter may include：Uplink feedback error is disappeared, the expectation bit number ζ of the message overhead needed for encapsulation；The vector quantization frequency band of feedback error the need for each descending detection symbol is included（Vectored Band) number, the arrow Quantify the bit number needed for the error that the number of the subcarrier of feedback error and expression are measured on each subcarrier for needing feedback error of the vector quantization frequency band the need for frequency band is included_Λ.Also, in a kind of possible implementation, definite value unit 1430 calculates the value of the Ν using formula 7 as above.

[96] it should be noted, described that the expectation bit number ζ that uplink feedback error information progress message encapsulates required message overhead is referred to carry out uplink feedback error information the desired value that message encapsulation is message overhead, the overhead value of this desired value and reality is possible different in some encapsulation format.Such as, in the encapsulation format similar to HDLC, due to the processing of transparent byte（Octet transparency), different payloads（Payload the expense needed for) is different.In some cases, this desired value can be set as 0.

[97] computing unit 1440 is connected with 10 units 1410, for by the error information that the uplink symbol by most accounting for the continuous up duration of C superframe received via 10 units 1410 from the network side equipment is fed back be combined into 1 corresponding error information of descending detection symbol, and crosstalk cancellation coefficient is calculated based on combined error information.Wherein, C is the integer more than or equal to N and less than or equal to M.

[98] in a kind of possible implementation, VCE 1400 may also include monitoring unit 1450.Monitoring unit 1450 is connected with definite value unit 1430, it is mainly used in monitoring the change of the channel in the DSLAM systems, and in newly-built or erasure channel in detecting the DSLAM systems, superframe structure parameter and error feedback parameter of the definite value unit 1430 again based on each channel current in the DSLAM systems is set to calculate the value of the N, and the value based on the N redefines the value of the M.So, because VCE 1400 can make definite value unit 1430 that the M dynamically are adjusted into appropriate value in time according to the change of channel in the DSLAM systems by monitoring unit 1450, even if so that occurring in that channel is newly-built or eliminates in the DSLAM systems, it can also ensure that the user side equipment and the network side equipment are based on the suitable M, the C and the L value carry out detection modulation and error feedback, ensure that the error feedback of the user side equipment follows the detection of the network side equipment to modulate in an orderly manner, so as to further improve the degree of accuracy of crosstalk cancellation coefficient. Embodiment 10

[99] Figure 15 shows VCE according to another embodiment of the present invention structured flowchart.As shown in Figure 15, VCE 1500 can be applied to include the DSLAM systems of the VCE, network side equipment and user side equipment, and including 10 interfaces 1510 and processor 1520.

[100] wherein, as shown in figure 15,10 interfaces 1510 are connected with the network side equipment and processor 1520, are mainly used in being communicated with the network side equipment.

[101] processor 1520 is connected with 10 interfaces 1510, is mainly used in：

[102] 1, give the network side equipment distribution detection sequence, and by the detection sequence via

10 interfaces 1510 are notified to the network side equipment.Wherein, the detection sequence includes a string

0th, 1 bit, and 1 detection element is constituted per a bit, a is the integer more than or equal to 1.

[103] 2, superframe structure parameter and error feedback parameter based on each channel in the DSLAM systems calculate N value, and the N calculated value is notified to the network side equipment via 10 interfaces 1510.Wherein, N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe.

[104] 3, by the error information that the uplink symbol by most accounting for the continuous up duration of C superframe received via 10 interfaces 15 10 from the network side equipment is fed back be combined into 1 corresponding error information of descending detection symbol, and crosstalk cancellation coefficient is calculated based on combined error information.Wherein, C is the integer more than or equal to N and less than or equal to M；M is the integer more than or equal to N, represents descending detection symbol by number of the network side equipment to the continuous superframe of the same detection element modulation in the detection sequence.

[105] in a kind of possible implementation, the dual-mode of the transceiver in the DSLAM systems is time division duplex（TDD in the case of), the superframe structure parameter may include：The number for the TTD frames that each superframe is included《, the number 6 for the uplink symbol that each frame is included, and disappearing of can carrying of each uplink symbol, the bit number χ of data.The error feedback parameter may include：The expectation bit number ζ of the required message overhead of message encapsulation is carried out to uplink feedback error；What each descending detection symbol was included Need the vector quantization frequency band of feedback error（Vectored Band) number, the bit number needed for the error that the number of the subcarrier of feedback error and expression are measured on each subcarrier for needing feedback error of the vector quantization frequency band the need for the vector quantization frequency band is included.Also, processor 1520 calculates the value of the N using formula 6 as above.

[106] in alternatively possible implementation, the dual-mode of the transceiver in the DSLAM systems is FDD（FDD in the case of), the superframe structure parameter may include：The number 6 for the symbol that each superframe is included, and each bit number x for the upstream message data that the symbol can be carried.The error feedback parameter may include：Uplink feedback error is disappeared, disappearing needed for encapsulation, the expectation bit number ζ of expense；The vector quantization frequency band of feedback error the need for each descending detection symbol is included（Vectored Band) number, the number t of the subcarrier of feedback error the need for the vector quantization frequency band is included_k；And represent bit number needed for the error measured on each subcarrier for needing feedback error of the vector quantization frequency band_Λ.Also, processor 1520 calculates the value of the Ν using formula 7 as above.

[107] in another possible implementation, processor 1520 can be additionally used in the change for monitoring the channel in the DSLAM systems, and in newly-built or erasure channel in detecting the DSLAM systems, again superframe structure parameter and error feedback parameter based on each channel current in the DSLAM systems calculate the value of the N, and the value based on the N redefines the value of the M.So, because the M dynamically can be adjusted to appropriate value by VCE 1500 in time by processor 1520 according to the change of channel in the DSLAM systems, even if occurring in that channel is newly-built or eliminates in the DSLAM systems, it can also ensure that the user side equipment and the network side equipment are based on the suitable ^1, the C and the L value carry out detection modulation and error feedback, ensure that the error feedback of the user side equipment follows the detection of the network side equipment to modulate in an orderly manner, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

Embodiment 11

[108] Figure 16 shows the structured flowchart of the VCE according to further embodiment of this invention.It is described VCE 1600 can possess host server, personal computer PC or portable portable computer or terminal of computing capability etc..The specific embodiment of the invention is not limited implementing for calculate node.

[109] VCE 1600 includes processor 1610,10 interfaces 1620, memory 1630 and bus 1640.Wherein, processor 1610, I/O interface 1620 and memory 1630 complete mutual communication by bus 1640.

[1 10] 10 interface 1620 is used to communicate with the network side equipment in DSLAM systems.

[1 1 1] memory 1630 is used to deposit program and/or data, and the program can be to include the program code of computer-managed instruction.Memory 1630 may include high-speed RAM memory, it is also possible to also including nonvolatile memory（Non-volatile memory), for example, at least one magnetic disk storage.Memory 1630 can also be memory array.Memory 1630 is also possible to by piecemeal, and described piece can be combined into virtual volume by certain rule.

[1 12] processor 1610 is used for program.Processor 1610 is probably a central processor CPU, either application-specific integrated circuit ASIC (Application Specific Integrated Circuit), or be arranged to implement one or more integrated circuits of the embodiment of the present invention.

[1 13] in a kind of possible embodiment, processor 1610 causes the VCE 1600 to perform following operation by performing the program that memory 1330 is stored：The VCE distributes detection sequence to the network side equipment；Superframe structure parameter and error feedback parameter of the VCE based on each channel in the D SLAM systems calculate N value, and the value based on the N determines the value of the M, and the value of the M is notified to the network side equipment；And, the VCE receives the error information fed back by the uplink symbol at most accounting for the continuous up duration of C superframe from the network side equipment, the error information composition that the uplink symbol that the continuous up duration of C superframe is at most accounted for by described is fed back error information corresponding with 1 descending detection symbol, and based on combined error information calculating crosstalk cancellation coefficient.Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1；C is whole more than or equal to N and less than or equal to M Number；N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe；And, M represents descending detection symbol by number of the network side equipment to the continuous superframe of the same detection element modulation in the detection sequence, and M is the integer more than or equal to N.

Embodiment 12

[114] according to one embodiment of the invention, a kind of DSLAM systems are additionally provided, the DSLAM systems include above-mentioned VCE 1400/1500/1600, at least two above-mentioned user side equipments 1100/1200/1300 of above-mentioned network side equipment 800/900/1000 and at least two;Detection sequence is sent to above-mentioned network side equipment 800/900/1000 by wherein above-mentioned VCE 1400/1500/1600, and M value is sent into above-mentioned network side equipment 800/900/1000 and user side equipment 1100/1200/1300.

Embodiment 13

[115] in G.993.5 middle pilot frequency sequence by a string of 0,1 Sequence compositions, the sequence successively and cyclically will be modulated on synchronizing symbol.When bit is 0, all detection subcarriers of current sync symbol（Probe tones) modulation 4-QAM planispheres in constellation point 00 (corresponding to 1+1 i);When bit is 1, the constellation point 11 in all detection subcarrier-modulated 4-QAM planispheres of current sync symbol (corresponds to -1-li；).

[116] however, in G.993.5, some subcarrier is used as flag tones (mark subcarriers on synchronizing symbol）With, modulated pilots sequence is unable on these subcarriers, and 4-QAM 11 or 00 is only modulated simultaneously.For example, some the OLR (online reconfiguration sent when confirmation opposite end）When, switch to 00 by currently modulate 11 or switch to 11 from 00, continue to keep after switching, until confirming another OLR next time.

[117] due to the presence of mark subcarrier, all subcarriers that can not cover synchronizing symbol will be caused to carry out detection modulation and error feedback, this obviously will influence the degree of accuracy of channel estimation.

[118] in view of this, in the case of using the descending detection symbol of the individual superframe of same detection element modulation continuous N (M is more than or equal to 2), it is contemplated that being grouped to the subcarrier of the descending detection symbol, and it is modulated at by a detection element in the detection sequence When on the descending detection symbol of continuous N superframe, the subcarrier in the descending detection symbol is set to be modulated in turn by group.

The subcarrier for detecting symbol as shown in figure 17, can be divided into two groups by [1 19] in a kind of possible implementation, and this two groups subcarrier is used alternatingly as detection subcarrier and mark subcarrier.In fig. 17, PS represents to detect subcarrier, and SF represents to mark subcarrier.In this case, VCE needs to notify the corresponding form of detection subcarrier, mark subcarrier on detection symbol to network side equipment and by network side equipment to user side equipment.

[120] in alternatively possible implementation, as described in Figure 18, the subcarrier that detect symbol can be also divided into multigroup, and subcarrier on detection symbol alternately be modulated by group using the form such as detection subcarrier group related, mark subcarrier group correlation in a second manner in the first way.Has speech, it is being divided into the case of 4 groups, detect subcarrier group inner modulation identical detection element, mark the constellation point of subcarrier group inner modulation opposite number each other, the sub-carrier group that need to only notify network side equipment so as to VCE and modulate identical detection element by network side equipment notice user side equipment is that a sub-carrier group of the constellation point of opposite number is to mark subcarrier each other for detection subcarrier, modulation, and organize 1 and organize 2 and constitute a sub-carrier group pair, group 3 and group 4 while constituting a sub-carrier group pair.

[121] so, have an opportunity to be detected modulation and error feedback due to detecting all subcarriers of symbol, VCE can obtain the complete error information of all subcarriers of correspondence detection symbol, so as to intactly estimate the channel on all subcarriers.

[122] in addition, modulating continuous N using same detection element, (M is more than or equal to u, in the case that u is more than or equal to 3) the descending detection symbol of individual superframe, it is contemplated that being grouped to the subcarrier of the descending detection symbol, and when a detection element in the detection sequence is modulated on the descending detection symbol of continuous N superframe, the subcarrier in the descending detection symbol is modulated in turn by group.

[123] in a kind of possible implementation, the subcarrier in detection symbol is applied not only to detection modulation, in addition it is also necessary to which for other at least two class purposes of such as mark modulation etc, that is, the subcarrier detected in symbol has u purposes（U is more than or equal to 3), in consideration of it, will can detect The subcarrier of symbol is divided into u groups, and the subcarrier of this U group is used alternatingly as U class purposes.In this case, VCE needs to notify corresponding form of the subcarrier group of the u classes purposes on detection symbol to network side equipment and by network side equipment to user side equipment.

[124] in alternatively possible implementation, the subcarrier in detection symbol has u class purposes（3) u is more than or equal to, in consideration of it, can be divided into u by the subcarrier that detect symbol and be multiplied by V groups, per V groups as a sub- carrier wave set set to constitute kth class purposes in u sub- carrier wave set set, the u classes purposes（K=l, 2 ... ..., u) u sub- carrier wave set set on detection symbol will be in turn modulated using kth kind related form.Network side equipment need to be only notified so as to VCE and notifies the subcarrier group that u sub- carrier wave set set of user side equipment include respectively to be used for kth class purposes with subcarrier and with the subcarrier group set of kth kind mode associated modulation by network side equipment（K=l, 2 ... ..., u).

[125] so, have an opportunity to be detected modulation and error feedback due to detecting all subcarriers of symbol, VCE can obtain the complete error information that correspondence detects all subcarriers of symbol, so as to intactly estimate the channel on all subcarriers.

Embodiment 14

[126] Figure 19 shows the flow chart of detection modulator approach according to an embodiment of the invention, error feedback method and crosstalk cancellation coefficient acquisition methods.As shown in figure 19, it can be applied to include the DSLAM systems of VCE, network side equipment and user side equipment according to the method for this embodiment of the invention, and including：

[127] when the circuit in DSLAM systems is initialized, superframe structure parameter and error feedback parameter of the VCE based on each channel in the D S L A M systems calculate N value and the value based on the N determines M value（S 191 is 1), and determine position of the superframe for detecting symbol in the continuous N superframe comprising modulation detection element in continuous N superframe, then the value of the M is notified to the network side equipment, and the network side equipment is given by the location information notification of the superframe of the detection symbol comprising modulation detection element.Wherein, N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on the descending detection symbol of 1 superframe.M represents the number of continuous superframe, and the M The descending detection symbol of at least one superframe is utilized the same detection element in detection sequence to modulate by the network side equipment in individual continuous superframe, and M is the integer more than or equal to N.The detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1.

[128] this is based on, the network side equipment records the value of the M（S 1921), and the value of the M is notified to the user side equipment.The network side equipment records the superframe positional information of the detection symbol comprising modulation detection element in the continuous N superframe.Also, in a kind of possible implementation, the network side equipment detects the modulation location information notification of the superframe of element to the user side equipment, so that user side equipment correctly recognizes the descending detection symbol of modulation detection element.In alternatively possible implementation, the network side equipment equipment does not detect the modulation location information notification of the superframe of element to the user side equipment, and user side equipment voluntarily recognizes the descending detection symbol of modulation detection element.

[129] correspondingly, value of the user side equipment based on the received M and itself N value determine C and L value（S 193 1 ).Wherein, the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that the user side equipment is connected based on itself are calculated.C is the integer more than or equal to N and less than or equal to M, and L is the integer more than or equal to 1 and less than or equal to M.

[130] on the other hand, the VCE is to network side equipment distribution detection sequence (S 1912), and the detection sequence distributed is sent into the network side equipment.

[13 1] it is based on this, the network side equipment is after the detection sequence of the VCE distribution is received, each detection element in the detection sequence is modulated and each detection element is modulated in continuous N superframe on the descending detection symbol of at least one superframe (S 1922), and the superframe after modulation is sent to the user side equipment.Wherein, the descending detection symbol that different detection elements is modulated at is different；In addition in a kind of possible implementation, each detection element in the detection sequence is modulated in the network side equipment and each detection element is modulated at least one in continuous N superframe Operation on the descending detection symbol of individual superframe（S 1922) in, the superframe of the descending detection symbol comprising modulation detection element sent by the network side equipment is identical with the superframe for the descending detection symbol comprising modulation detection element that synchronization is sent by other network side equipments in the DSLAM systems.So, because all circuits carry out repeating modulation using the detection element detection symbol descending to mutually in the same time at least one of respective detection sequence respectively, so as to ensure the degree of accuracy of crosstalk cancellation coefficient.

[132] correspondingly, the user side equipment calculates the statistical average for the error measured on the descending detection symbol of L superframe of the descending detection symbol that modulation detection element is contained in the continuous N superframe（S 1932), and utilize the error information at most accounting for statistical average described in the uplink symbol feedback representation of the continuous up duration of C superframe（S 1933).Wherein, in the case where L is equal to 1, the L superframe can be that any one superframe for modulating the descending detection symbol for detecting element is contained in the M superframe.In the case where L is more than or equal to 2, the L superframe can be contain in the M superframe modulation detect element descending detection symbol is continuous or multiple superframes discontinuously.The uplink symbol at most accounting for the continuous up duration of C superframe can be uplink symbol since the uplink symbol of continuous multiple superframes the head of some superframe or continuous multiple superframes since any pars intermedia of some superframe.

[133] so, the error information fed back by the uplink symbol at most accounting for the continuous up duration of C superframe can be combined into after the error information that the uplink symbol at most accounting for the continuous up duration of C superframe by described is fed back is received via the network side equipment and descending detect the corresponding error information of symbol with 1 by the VCE（S 1913), and crosstalk cancellation coefficient is calculated based on combined error information（S 1914).In the case where C is more than M caused by some are expected because message overhead exceedes, user side equipment will terminate this feedback error data, and enter the feedback of measurement error next time.

[134] Figure 20 a 20c show to carry out the superframe flow diagram that detection modulation and error are fed back by method shown in Figure 19., it is apparent that by being modulated in network side equipment using same detection element in continuous N superframe on the descending detection symbol of at least one superframe and in user The error information that side apparatus is measured using the uplink symbol feedback at most accounting for the continuous up duration of C superframe on 1 descending detection symbol, the above method according to an embodiment of the invention enables to the error feedback of user side equipment to follow the detection of network side equipment to modulate in an orderly manner, even in needing to use multiple superframes to carry out uplink feedback on a descending detection symbol in the case of the error measured, also can economy calculate the crosstalk cancellation coefficients of DSLAM systems exactly.

[135] need what is illustrated, although step S 191 1 is shown as into the progress before step S 19 12 in Figure 19, but the invention is not restricted to this, those skilled in the art will be understood that step S 1911 also can simultaneously be carried out after step S 1912 or with step S 1912.

[136] in addition, although in order to which simplified illustration illustrate only a detection modulation for detecting element and error feedback in Figure 19, but those skilled in the art will be understood that, in actually implementing, each detection element in detection sequence will be modulated, to ensure that the user side equipment at least feeds back the error on all detection symbols corresponding to a complete detection sequence.And, in a kind of possible implementation, the network side equipment is modulated to each detection element in the detection sequence and each the detection element is modulated at the operation in continuous N superframe on the descending detection symbol of at least one superframe（S 1922) at least it is repeated once.So, carry out repeatedly detection by using same detection sequence to modulate, crosstalk cancellation coefficient is constantly calculated or update using the error feedback repeatedly obtained, so as to further improve the degree of accuracy of crosstalk cancellation coefficient.

[137] in a kind of possible implementation, the dual-mode of the transceiver in the DSLAM systems is time division duplex（TDD in the case of), the superframe structure parameter may include：The number for the TTD frames that each superframe is included《, the number for the uplink symbol that each frame is included, and disappearing of can carrying of each uplink symbol, the bit number χ of data.The error feedback parameter may include：The expectation bit number ζ of the required message overhead of message encapsulation is carried out to uplink feedback error information；The vector quantization frequency band of feedback error the need for each descending detection symbol is included（Vectored Band) number, the number ^ of the subcarrier of feedback error the need for the vector quantization frequency band is included；And represent in the arrow Quantify the bit number needed for the error measured on each subcarrier for needing feedback error of frequency band_Λ.Also, the VCE can calculate the value of the Ν using formula below 6, wherein "_α] represent.Round up number.

Ν :(formula 6)

[138] in alternatively possible implementation, the dual-mode of the transceiver in the DSLAM systems is FDD（FDD in the case of), the superframe structure parameter may include：The number 6 for the symbol that each superframe is included, and each bit number x for the upstream message data that the symbol can be carried.The error feedback parameter may include：Uplink feedback error information is disappeared, disappearing needed for encapsulation, the expectation bit number ζ of expense；The vector quantization frequency band of feedback error the need for each descending detection symbol is included（Vectored Band) number, the number of the subcarrier of feedback error the need for the vector quantization frequency band is included;And represent bit number 3^ needed for the error measured on each subcarrier for needing feedback error of the vector quantization frequency band.Also, the VCE can calculate the value of the N using formula below 7, wherein "_α] represent_ΩRound up number.

² +∑^,

Ν :

bx

[139] it should be noted that when VCE calculates the value of the N using above-mentioned formula 6 or formula 7, in the case where DSLAM systems include 1 channel, using the N values gone out for the channel calculation as whole DSLAM systems N values；And in the case where DSLAM systems include multiple channels, each channel calculation N values will be then directed to, and follow the detection of network side equipment to modulate in an orderly manner to ensure that the error of all user side equipments is fed back as the N values of whole DSLAM systems preferably using maximum N values.In addition, it is described message encapsulation is carried out to uplink feedback error information needed for the expectation bit number z of message overhead refer to disappear to uplink feedback error information, encapsulation is a desired value of message overhead, in some encapsulation format this Desired value may be different with actual overhead value.Such as, in the encapsulation format similar to HDLC, due to the processing of transparent byte（Octet transparency), different payloads（Payload the expense needed for) is different.In some cases, this desired value can be set as 0.

[140] in another possible implementation, each detection element in the detection sequence is modulated in the network side equipment and each the detection element is modulated at the operation in continuous N superframe on the descending detection symbol of at least one superframe（S 1922) in, the superframe of the descending detection symbol comprising modulation detection element sent by the network side equipment is identical with the superframe for the descending detection symbol comprising modulation detection element that synchronization is sent by other network side equipments in the DSLAM systems.So, because all circuits carry out repeating modulation using the detection element detection symbol descending to mutually in the same time at least one of respective detection sequence respectively, so as to ensure the degree of accuracy of crosstalk cancellation coefficient.

[141] in another possible implementation, each detection element in the detection sequence is modulated in the network side equipment and each the detection element is modulated at the operation in continuous N superframe on the descending detection symbol of at least one superframe（S 1922) in, the network side equipment can by predetermined mode, for example G.993.5 in be used for the pattern that marks synchronizing symbol（Pattern mode), the pattern for making the descending detection symbol of k-th of superframe in each continuous N superframe that there is structure to fix.Wherein, k is the integer more than or equal to 1 and less than or equal to M.So, because the network side equipment makes the pattern that there is the descending detection symbol of some superframe in each continuous N superframe structure to fix, the user side equipment is enabled according to descending detection symbol whether to there is the pattern that structure is fixed to be accurately positioned continuous M superframe, so that the error feedback for being more conducive to the user side equipment follows the detection of the network side equipment to modulate in an orderly manner.

Practicality

[142] detection modulator approach, error feedback method, crosstalk cancellation coefficient acquisition methods and corresponding network side equipment, user side equipment, vector quantization controlled entity and the DSLAM systems provided according to embodiments of the present invention, is at most accounted on continuous C superframe by being modulated continuous N superframe using same detection element in network side equipment and being utilized in user side equipment The error information that the uplink symbol feedback of row duration is measured on 1 descending detection symbol, method according to an embodiment of the invention enables to the error feedback of user side equipment to follow the detection of network side equipment to modulate in an orderly manner, even in needing to use multiple superframes to carry out uplink feedback on a descending detection symbol in the case of the error measured, also can economy calculate the crosstalk cancellation coefficients of D SLAM systems exactly.

[143] those of ordinary skill in the art are it is to be appreciated that each exemplary cell and algorithm steps in embodiment described herein, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are realized with hardware or software form actually, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel can realize described function for the different method of specific application selection, but this realization is it is not considered that beyond the scope of this invention.

[144] if using in the form of computer software come realize the function and as independent production marketing or in use, if to a certain extent it is believed that technical scheme all or part（The part for example contributed to prior art）Embody in form of a computer software product.The computer software product is generally stored inside in the storage medium of embodied on computer readable, including some instructions are to cause computer equipment（Can be personal computer, server or network equipment etc.）Perform all or part of step of various embodiments of the present invention method.And foregoing storage medium includes USB flash disk, mobile hard disk, read-only storage（ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.

[145] it is described above; only embodiment of the invention; but protection scope of the present invention is not limited thereto; it is also contemplated that will invent in the heterogeneous network applied to LTE-A; any one skilled in the art the invention discloses technical scope in; change or replacement can be readily occurred in, should be all included within the scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.

Claims

Claims

1st, a kind of detection modulator approach, applied to including the system of network side equipment and user side equipment, it is characterised in that including：

The network side equipment receives detection sequence；And

The network side equipment is modulated to each detection element in the detection sequence and each detection element is modulated on the descending detection symbol of continuous N superframe, wherein, the detection sequence includes a string of 0,1 bits, and 1 detection element is constituted per a bit, a is the integer more than or equal to 1, and

M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

2nd, detection modulator approach according to claim 1, characterized in that, the operation that the network side equipment is modulated to each detection element in the detection sequence and each detection element is modulated on the descending detection symbol of continuous N superframe is at least repeated once.

3rd, detection modulator approach according to any one of claim 1 to 2, it is characterized in that, each detection element in the detection sequence is modulated in the network side equipment and each detection element is modulated in the operation on the descending detection symbol of continuous N superframe

The superframe modulated by the network side equipment is identical with the superframe that synchronization is modulated by other network side equipments.

4th, detection modulator approach according to any one of claim 1 to 3, it is characterised in that also include：

The network side equipment makes the pattern that there is the descending detection symbol of k-th of superframe in each continuous N superframe structure to fix,

Wherein, k is the integer more than or equal to 1 and less than or equal to M.

5th, detection modulator approach according to any one of claim 1 to 4, it is characterised in that also include：

The network side equipment receives the M that vector quantization controlled entity VCE is sended over Value.

6th, a kind of network side equipment, applied to including the system of the network side equipment and user side equipment, it is characterised in that including：

Unit 10, for receiving detection sequence；

Modulating unit, is connected with Unit 10 and the communication unit, for the descending detection symbol being modulated to each detection element in the detection sequence and each the detection element is modulated at continuous N superframe；And

Communication unit, for being communicated with the user side equipment by superframe, wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1, and

M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

7th, network side equipment according to claim 6, it is characterised in that also including the cycling element being connected with the modulating unit,

The cycling element is used to making the modulating unit to repeat to be modulated each detection element in the detection sequence and each detection element is modulated at operation on the descending detection symbol of continuous N superframe at least one times.

8th, the network side equipment according to any one of claim 6 to 7, it is characterised in that also including the synchronization unit being connected with the modulating unit,

The synchronization unit is used to be modulated each detection element in the detection sequence in the modulating unit and each detection element is modulated in the operation on the descending detection symbol of continuous N superframe, makes the superframe modulated by the modulating unit identical with the superframe that synchronization is modulated by other network side equipments.

9th, the network side equipment according to any one of claim 6 to 8, it is characterised in that also including the indexing unit being connected with the modulating unit,

The indexing unit is used for the pattern for making the descending detection symbol of k-th of superframe in each continuous N superframe that there is structure to fix, Wherein, k is the integer more than or equal to 1 and less than or equal to M.

10th, the network side equipment according to any one of claim 6 to 9, it is characterised in that

Unit 10 is additionally operable to receive the value for the M that VCE is sended over.

11, a kind of error feedback method, applied to including the system of network side equipment and user side equipment, it is characterised in that including：

The user side equipment calculates the statistical average for the error measured on the descending detection symbol of the L superframe in continuous N superframe；And

The user side equipment utilizes the error information at most accounting for statistical average described in the uplink symbol feedback representation of the continuous up duration of C superframe,

Wherein, the descending detection symbol of the continuous N superframe is modulated by the same detection element in the network side equipment detection sequence,

The detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1,

L is the integer more than or equal to 1 and less than or equal to M,

C is the integer more than or equal to N and less than or equal to M, and

M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

12nd, the error feedback method according to claim 11, it is characterised in that also include：

There is the user side equipment superframe of the pattern of structure fixation to position the continuous N superframe according to descending detection symbol.

13rd, the error feedback method according to any one of claim 11 to 12, it is characterised in that also include：

The user side equipment receives the value for the M that the network side equipment is notified, and the value based on the M and itself N value determine or updated the C and/or the L value, wherein the value of itself N refers to the channel that the user side equipment is accessed based on itself 14th, a kind of user side equipment, applied to the system including network side equipment and the user side equipment, it is characterised in that including：

Communication unit, for being communicated with the network side equipment by superframe；Computing unit, is connected with the communication unit, the statistical average for the error measured on the descending detection symbol for calculating the L superframe in continuous N superframe；And

Load sharing unit, is connected with the computing unit and the communication unit, the error information for representing the statistical average using the uplink symbol carrying at most accounting for the continuous up duration of C superframe,

Wherein, the descending detection symbol of the continuous N superframe is modulated by the same detection element in the network side equipment detection sequence,

The detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1,

L is the integer more than or equal to 1 and less than or equal to M,

C is the integer more than or equal to N and less than or equal to M, and

M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

15th, user side equipment according to claim 14, it is characterised in that also including the positioning unit being connected with the communication unit and the computing unit,

The positioning unit is used to the superframe for the pattern that according to descending detection symbol there is structure to fix position the continuous N superframe.

16th, the user side equipment according to any one of claim 14 to 15, it is characterised in that also including the definite value unit being connected with the communication unit, the computing unit and the load sharing unit,

The communication unit is additionally operable to receive the value for the M that the network side equipment is notified, and

The definite value unit is used for the value based on the M and itself N value determination or renewal The C and/or the L value, wherein the value of itself N refers to the value for the N that the superframe structure parameter and error feedback parameter of the channel that the definite value unit itself is accessed based on the user side equipment are calculated.

17th, a kind of digital subscriber line multiplexing DSLAM systems, it is characterised in that including：Vector quantization controlled entity VCE,

At least two network side equipments according to any one of claim 6 to 10；And

At least two user side equipments according to any one of claim 11 to 16；Detection sequence is sent to the network side equipment by wherein described V C E, and M value is sent into the network side equipment and user side equipment；Wherein M represents that descending detection symbol is utilized the number of the continuous superframe of the same detection element modulation in detection sequence by the network side equipment.

18th, a kind of detection modulator approach, applied to including the system of network side equipment and user side equipment, it is characterised in that including：

The network side equipment receives detection sequence；And

The network side equipment is modulated to each detection element in the detection sequence and each detection element is modulated in continuous N superframe on the descending detection symbol of at least one superframe,

Wherein, the detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1, and

M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.

19th, detection modulator approach according to claim 18, it is characterized in that, each detection element in the detection sequence is modulated in the network side equipment and each detection element is modulated in the operation in continuous N superframe on the descending detection symbol of at least one superframe

The descending detection symbol for including modulation detection element sent by the network side equipment The superframe of the descending detection symbol comprising modulation detection element that is sent by other network side equipments of superframe and synchronization it is identical.

20th, the detection modulator approach according to any one of claim 18 to 19, it is characterised in that also include：

The network side equipment receives the superframe positional information of the detection symbol comprising modulation detection element in the continuous N superframe that vector quantization controlled entity VCE is sended over.

21st, a kind of user side equipment, applied to the system including network side equipment and the user side equipment, it is characterised in that including：

Communication unit, for being communicated with the network side equipment by superframe；Computing unit, is connected with the communication unit, the statistical average for the error measured on the descending detection symbol for calculating the L superframe in continuous N superframe；And

Load sharing unit, is connected with the computing unit and the communication unit, the error information for representing the statistical average using the uplink symbol carrying at most accounting for the continuous up duration of C superframe,

Wherein, the descending detection symbol of at least one superframe is modulated by the same detection element in the network side equipment detection sequence in the continuous N superframe,

The detection sequence includes a string of 0,1 bits, and constitutes 1 detection element per a bit, and a is the integer more than or equal to 1,

L is the integer more than or equal to 1 and less than or equal to M,

C is the integer more than or equal to N and less than or equal to M, and

M is the integer more than or equal to N, and N represents the superframe number needed for the error that the user side equipment uplink feedback is measured on 1 descending detection symbol.