WO2014101847A1 - 一种串扰信道估计方法、装置和系统 - Google Patents
一种串扰信道估计方法、装置和系统 Download PDFInfo
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- WO2014101847A1 WO2014101847A1 PCT/CN2013/090790 CN2013090790W WO2014101847A1 WO 2014101847 A1 WO2014101847 A1 WO 2014101847A1 CN 2013090790 W CN2013090790 W CN 2013090790W WO 2014101847 A1 WO2014101847 A1 WO 2014101847A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
Definitions
- the present invention relates to the field of network technologies, and in particular, to a crosstalk channel estimation method, apparatus, and system. Background technique
- xDSL Digital Subscriber Line, various types of digital subscriber lines
- DSLAM DSL Access Multiplexer
- NEXT Near End Cross-Talk
- FEXT FeXT
- Near-end crosstalk is the interference of the receiving signal of the device by the transmitting signal of the near-end device.
- the far-end crosstalk is the interference of the transmitting signal of the remote device received by the receiving signal of the device.
- the uplink and downlink channels of xDSL use frequency division multiplexing. Therefore, near-end crosstalk does not have much influence on the performance of the system, and can generally be ignored. Far-end crosstalk can have a severe impact on the channel rate, causing the system to be unstable and even the line cannot be turned on.
- a crosstalk cancellation (Vectored-DSL) technique for reducing or eliminating FEXT, mainly utilizing the possibility of joint transmission and reception at the DSLAM end, and estimating a crosstalk channel, that is, a transmission function between channels.
- the calculation is performed, and the uplink or downlink crosstalk cancellation coefficient is further calculated, and the signal is processed according to the crosstalk cancellation coefficient to cancel the FEXT interference.
- the estimation of the crosstalk channel and the calculation of the crosstalk cancellation coefficient in Vectored-DSL technology are repeatedly applied during the line initialization process when the user accesses the network and after the line initialization process ends.
- the crosstalk channel H can be represented in the form of a matrix on any tone (carrier) in the frequency domain, and the elements of the i-th row and the j-th column in the matrix are used to represent the transmission function of the line pair j to the line pair i (the transmission of the line pair j)
- the transfer function of the end-to-line pair i can reflect the crosstalk generated by the line pair j's transmit signal pair line i.
- a pilot sequence is selected for each pair.
- the pilot sequence can be a sequence of binary digits consisting of 0, 1.
- the pilot sequence represented in vector form is composed of -1, 1.
- the vector (where element 1 of the vector corresponds to a binary number 0, and element-1 of the vector corresponds to a binary number 1).
- the pilot sequences of the pairs are orthogonal to each other.
- the sync symbol is modulated and transmitted using each bit in the pilot sequence, and the receiving end receives the error sample obtained by the crosstalk on each sync symbol.
- Pass on The analysis of the pilot sequence and the error samples on each pair can calculate the crosstalk channel H, and the crosstalk cancellation coefficient can be obtained.
- the length of each pilot sequence should be greater than or equal to the total number of new join pairs and showtime pairs in the system (in addition, the pilot sequence length is also It should be 2 natural powers).
- the system modulates the synchronization symbols by using each bit of the corresponding pilot sequence in sequence on each pair (using the first bit to modulate the first synchronization symbol, using the second bit to the second)
- the synchronization symbol is modulated and transmitted, and so on. Therefore, the number of synchronization symbols required for a crosstalk channel estimation process is the same as the length of the pilot sequence.
- the system generally transmits symbols (such as 4000symbol/s, 8000symbol/s, etc.) in a certain period, and sends a certain number (such as 256) of data symbols each time.
- a certain number such as 256
- Sending a synchronization symbol assuming that the length of the pilot sequence is n, the system needs n synchronization symbols to complete the process of crosstalk channel estimation. It can be seen that the time required for a crosstalk channel estimation process is proportional to the length of the pilot sequence.
- the length of the pilot sequence is at least the total number of new active pairs and pairs of online pairs in the system, and when the number of new active pairs and pairs of online pairs in the system is large, The time required for the estimation process of the crosstalk channel is longer, and the process of activating the uplink of the newly activated pair needs to perform the estimation of the crosstalk channel and the calculation process of the crosstalk cancellation coefficient, so that the new active pair will also be caused.
- the process of activating the online is very long. Summary of the invention
- a crosstalk channel estimation method which groups non-idle line pairs in the system according to the crosstalk impact data determined in the previous crosstalk channel estimation process, and between different pairs of pairs
- the crosstalk impact data is less than the set first threshold, and the method includes:
- a pilot sequence is assigned to each group, and at least one pair of pilot sequences that are not orthogonal to each other between different groups;
- the crosstalk channels of each group are estimated using the pilot sequences assigned to each group.
- At least one pair of pilot sequences that are not orthogonal to each other between the different groups is specifically: at least one pair of identical pilot sequences between different groups.
- the different groups have at least one pair of identical pilot sequences, specifically: all pilot sequences allocated for each group, and one of each pilot sequence of the group with the largest number of assigned pilot sequences The pilot sequence is the same.
- the estimating the crosstalk channel of each group specifically, estimating the crosstalk channel of the pair of uplink lines for the new active line pair in each group;
- the assigning a pilot sequence to each group according to the number of pairs in each group is specifically:
- a new pilot line pair is assigned a number of pilot sequences for the number of new active line pairs
- the estimating the crosstalk channel of each group is specifically estimating the crosstalk channel between all pairs in each group;
- the pilot sequence is assigned to each group according to the number of pairs in each group, and is specifically: a pilot sequence in which the number of pairs in the group is assigned to each pair in the group.
- the row index of the pilot sequence allocated to each new active pair in the system in the uplink crosstalk channel estimation process remains unchanged in the Walsh matrix
- the method for determining the length of the pilot sequence in each group includes:
- the group in which the number of pairs in the group is greater than the maximum row index of the new active pair in the group, and the group not including the newly activated pair determine that the length of the pilot sequence in the group is greater than or equal to the number of pairs in the group
- the row index of the pilot sequence allocated to each new active pair in the system in the uplink crosstalk channel estimation process remains unchanged in the Walsh matrix
- the method for determining the length of the pilot sequence in each group includes:
- the method further includes:
- the length of the pilot sequence is set to the second threshold
- the length of the pilot sequence is set to the minimum natural power of 2 in the range of values.
- the crosstalk impact data determined in the previous crosstalk channel estimation process is grouped into non-idle line pairs in the system, and crosstalk impact data between different pairs of line pairs is less than a set first threshold value, Specifically:
- the first uplink crosstalk channel estimation process and the first downlink crosstalk channel estimation process are completed at the end of the line initialization process, according to the current line initialization.
- the uplink crosstalk impact data between non-idle pairs in the system determined during the first uplink crosstalk channel estimation process of the process, and the non-idle line in the system determined during the first downlink crosstalk channel estimation process of the current line initialization process The downlink crosstalk between the pair affects the data, and the non-idle pairs in the system are grouped, and the uplink crosstalk impact data and the downlink crosstalk impact data between the pairs of the different groups are smaller than the set first threshold; or
- the system is online.
- the downlink crosstalk between the pairs affects the data, and the paired pairs in the system are grouped.
- the uplink crosstalk impact data and the downlink crosstalk impact data between the different pairs are less than the set first threshold.
- the crosstalk impact data determined in the previous crosstalk channel estimation process is grouped into non-idle line pairs in the system, and different sets of line pairs are The crosstalk impact data is less than the set first threshold, specifically:
- the non-abnormal non-idle line pairs in the system are grouped, and the crosstalk impact data between the different sets of line pairs is less than the set first threshold value; An abnormal line pair is added to the group with the largest average; or
- the crosstalk impact data determined in the previous crosstalk channel estimation process non-abnormal non-idle line pairs in the system are grouped, and crosstalk impact data between different sets of line pairs is less than the set first threshold to determine the crosstalk effects
- the crosstalk in the data that is greater than the average affects the pair of lines corresponding to the data, and adds the pair of abnormal lines to the group to which the pair belongs.
- a server comprising:
- a grouping module configured to group non-idle line pairs in the system according to crosstalk impact data determined in the previous crosstalk channel estimation process, where crosstalk impact data between different pairs of line pairs is less than a set first threshold value;
- An obtaining module configured to obtain the number of pairs of pairs in each group under the current grouping
- An allocation module configured to allocate a pilot sequence to each group according to the number of pairs in each group, and at least one pair of pilot sequences that are not orthogonal to each other between different groups;
- An estimation module is configured to estimate a crosstalk channel of each group using a pilot sequence allocated for each group.
- the allocation module is specifically configured to:
- pilot sequence When a pilot sequence is assigned to each group, there is at least one pair of identical pilot sequences between the different groups.
- the allocation module is specifically configured to:
- all pilot sequences assigned to each group are the same as one pilot sequence in each pilot sequence of the group in which the number of pilot sequences is assigned the most.
- the estimating module is specifically configured to estimate, for a new active line pair in each group, a crosstalk channel of the paired line pair;
- the allocation module is specifically configured to:
- a new pilot line pair is assigned a number of pilot sequences for the number of new active line pairs
- the estimating module is specifically configured to estimate a crosstalk channel between all pairs in each group; a sequence.
- each uplink crosstalk channel estimation process is in the system.
- the row index of the assigned pilot sequence in the Walsh matrix remains unchanged; in the uplink crosstalk channel estimation process, the allocation module is specifically configured to:
- the group in which the number of pairs in the group is greater than the maximum row index of the new active pair in the group, and the group not including the newly activated pair determine that the length of the pilot sequence in the group is greater than or equal to the number of pairs in the group
- the row index of the pilot sequence allocated to each new active pair in the system in the uplink crosstalk channel estimation process remains unchanged in the Walsh matrix
- the allocation module is specifically configured to:
- the allocation module is further configured to:
- the length of the pilot sequence is set to the second threshold
- the length of the pilot sequence is set to the minimum natural power of 2 in the range of values.
- the grouping module is specifically configured to:
- the first uplink crosstalk channel estimation process and the first downlink crosstalk channel estimation process are completed at the end of the line initialization process, according to the current line initialization.
- the uplink crosstalk impact data between non-idle pairs in the system determined during the first uplink crosstalk channel estimation process of the process, and the non-idle line in the system determined during the first downlink crosstalk channel estimation process of the current line initialization process The downlink crosstalk between the pair affects the data, and the non-idle pairs in the system are grouped, and the uplink crosstalk impact data and the downlink crosstalk impact data between the pairs of the different groups are smaller than the set first threshold; or
- the uplink crosstalk impact data between the paired pairs, and the downlink crosstalk impact data between the paired pairs in the system determined during the downlink crosstalk channel estimation process after the end of the line initialization process, for the paired pairs in the system are less than the set first threshold.
- the grouping module is specifically configured to: according to the crosstalk impact data determined in the previous crosstalk channel estimation process, the non-anomalous non-idle line pair in the system Performing grouping, the crosstalk influence data between different pairs of pairs is less than the set first threshold; adding the abnormal line pair to the group with the largest average; or
- non-abnormal non-idle line pairs in the system are grouped, and crosstalk impact data between different sets of line pairs is less than the set first threshold to determine the crosstalk effects
- the crosstalk in the data that is greater than the average affects the pair of lines corresponding to the data, and adds the pair of abnormal lines to the group to which the pair belongs.
- a crosstalk channel estimation system including a terminal and a server as described above, wherein: the terminal is configured to: send, to the server, a pilot sequence that is notified by the server in advance; or An error sample of a pilot sequence transmitted by the server is described, and the error sample is sent to the server.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- FIG. 1 is a flowchart of a crosstalk channel estimation method according to an embodiment of the present invention
- FIG. 2 is a flowchart of a crosstalk channel estimation method according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of a pilot sequence allocation result according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram of a pilot sequence allocation result according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of a pilot sequence allocation result according to an embodiment of the present invention.
- FIG. 6 is a flowchart of a crosstalk channel estimation method according to an embodiment of the present invention.
- FIG. 7 is a schematic structural diagram of a server according to an embodiment of the present invention.
- FIG. 8 is a schematic structural diagram of a server according to an embodiment of the present disclosure.
- FIG. 9 is a schematic structural diagram of a crosstalk channel estimation system according to an embodiment of the present invention. detailed description
- Embodiments of the present invention provide a crosstalk channel estimation method, which pre-groups non-idle line pairs in a system according to crosstalk impact data determined in a previous crosstalk channel estimation process, and crosstalk between different sets of line pairs The impact data is less than the set first threshold.
- the processing flow of the method may include the following steps:
- Step 101 Obtain the number of pairs of pairs in each group under the current group.
- Step 102 Assign a pilot sequence to each group according to the number of pairs in each group, and at least one pair of pilot sequences that are not orthogonal to each other between different groups.
- Step 103 Estimate the crosstalk channel of each group by using a pilot sequence allocated for each group.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- Embodiment 2 Embodiment 2
- An embodiment of the present invention provides a crosstalk channel estimation method, which may be performed by a network side.
- the DSLAM controls the execution, wherein after the pilot sequence is determined, the subsequent crosstalk channel estimation process may involve the terminal.
- the non-idle line pairs in the system may be grouped according to the crosstalk impact data determined in the previous crosstalk channel estimation process, and the crosstalk impact data between different pairs of line pairs is less than the set first threshold. value.
- the crosstalk influence data is used to indicate the absolute value of the crosstalk between the pairs, or the absolute value of the crosstalk cancellation coefficient multiplied by a preset coefficient.
- the first threshold value may be a preset value.
- the first threshold value may be an average value of crosstalk influence data between each non-idle pair of lines and a preset adjustment factor (eg, may be set Is the product of 1).
- the pairs in the system can be divided into new active pairs, paired pairs, and idle pairs.
- the new active pair is the pair that connects to the terminal that is requesting access to the network and is initializing.
- the online pair is The pair that has access to the network is working.
- the pair of idle lines that are in the idle state without requesting access to the network can be collectively referred to as non-idle pairs. The grouping process for non-idle pairs will be described in detail later.
- the processing flow of the method may include the following steps:
- Step 101 Obtain the number of pairs of pairs in each group under the current group.
- DSLAM can record related information of the group after each grouping, such as which line pairs are included in each group, the number of pairs in each group, etc., and can replace the old group with the newly recorded group information. information. Subsequent crosstalk channel estimation procedures can be performed based on the most recent packet in the frequency band.
- Step 102 Assign a pilot sequence to each group according to the number of pairs in each group, and at least one pair of pilot sequences that are not orthogonal to each other between different groups. Using pilot sequences that are not orthogonal to each other between different groups,
- pilot sequences allocated for each group may be the same as one pilot sequence in each pilot sequence of the group that has the largest number of assigned pilot sequences.
- the number of mutually orthogonal pilot sequences in the pilot sequences allocated for all pairs is the total number of allocated pilot sequences, that is, the number of pilot sequences of the group with the largest number of pilot sequences allocated.
- multiple crosstalk channel estimation processes may be performed. These crosstalk channel estimation processes may be to estimate the crosstalk channel of the pair of uplink lines of the new active line pair, or to estimate the crosstalk channel between all non-idle line pairs. .
- the RP-VECTOR 1, RP-VECTOR 1-1, and RP-VECTOR 1-2 phases are the upstream crosstalk channels for estimating the new active pair pair paired line pair, 0-P- VECTOR 1.
- 0-P-VECTOR 1-1, OP-VECTOR 2 stage is to estimate the downlink crosstalk channel of the new active pair to the paired line pair, and RP-VECTOR 2 stage is to estimate the uplink crosstalk channel between all non-idle pairs.
- the 0-P-VECTOR Phase 2-1 is to estimate the downlink crosstalk channel between all non-idle pairs.
- step 102 for different groups may be specifically as follows: For the group including the new active line pair and the online line pair , assigning the same pilot sequence to the paired pairs, and assigning the number of pilot sequences to the number of new active pairs for the new active pair; for groups containing only the new active pair, the number of new active pairs is The pilot sequence of the new active pair number; for a group containing only the upper pair, the same pilot sequence is assigned to the paired pair.
- the pilot sequences of the same group are orthogonal to each other, and different pilot sequences may be used between different groups or different pilot sequences may be used.
- the same pair of pilot sequences in the same group may use the same pilot sequence or a mutually orthogonal pilot sequence, and the pilot sequences of the paired pair and the newly activated pair are orthogonal to each other. Therefore, the number of pilot sequences of the group may be at least 1 plus the number of new active lines in the group.
- step 102 when estimating the crosstalk channel between all the pairs in the group (that is, all the non-idle pairs in the group), the processing of step 102 may be specifically as follows:
- the number of groups assigned to each pair in the group is a group.
- pilot sequences used by each group may be the same or different.
- L1 belongs to Gl
- L2 belongs to G2
- the pilot sequences used by L1 and L2 can be the same.
- a row of the Walsh matrix can be used as a pilot sequence, and a row index can be used to identify which row of the Walsh matrix the pilot sequence corresponds to, and a row index of 1 corresponds to the first row.
- the row index is 2 for the second row, and so on.
- the lower order Walsh matrix is the same as the upper left corner of the higher order Walsh matrix.
- the first two rows and two columns of the fourth order Walsh matrix are a second order Walsh matrix, so The first n elements of the Walsh matrix of different orders on any same row are the same.
- each uplink crosstalk channel may be estimated during a line initialization process.
- the row index of the pilot sequence allocated for each new active pair in the system remains unchanged in the Walsh matrix.
- the first n bits of the respective pilot sequences corresponding to the same row index are the same.
- the DSLAM may determine the row index in the Walsh matrix after selecting the pilot sequence, and then select the corresponding length of the row index (generally select a larger length,
- the pilot sequence such as 512 bits, is notified to the terminal.
- the DSLAM does not need to reselect the pilot sequence and does not need to send a notification to the terminal.
- the method of determining the length of the pilot sequence in each group may be as follows:
- Method 1 Obtain a row index of a pilot sequence allocated to each new active pair in the Walsh matrix during the first uplink crosstalk channel estimation process of the current line initialization process; and the number of pairs in the group is greater than the new in the group
- the group of the largest row index of the active pair, and the group that does not contain the new active pair determine that the length of the pilot sequence in the group is greater than or equal to the number of pairs in the group; the number of pairs in the group is not greater than the new active line in the group
- the group of the largest row index of the pair determining that the length of the pilot sequence in the group is greater than or equal to the maximum row index of the new active pair in the group.
- the line initialization process is the ongoing line initialization process or the line initialization process just finished.
- the length of the pilot sequences allocated for each group may be different. For each group, since the row index of the selected pilot sequence is kept unchanged for the new active line pair, and the pilot sequences within the group are to be orthogonal to each other, the length of the pilot sequence is at least new for the group.
- the maximum row index of the pair Also, the length of the pilot sequence needs to be set to a natural number of two. Therefore, preferably, the pilot sequence length can be set to be greater than or equal to the natural power of 2 of the maximum row index.
- the length of the pilot sequence may be at least the number of pairs in the group in order to ensure that the pilot sequences in the group are orthogonal to each other.
- the pilot sequence length can be set to be greater than or equal to the natural power of 2 of the number of pairs within the group.
- Method 2 obtaining the maximum row index of the pilot sequence allocated to each new active pair in the system in the Walsh matrix during the first uplink crosstalk channel estimation process of the current line initialization process; if the line of the group with the largest number of pairs is If the number of pairs is greater than the maximum row index, it is determined that the lengths of the pilot sequences in each group are equal and greater than or equal to the maximum number of pairs; if the number of pairs of the group with the largest number of pairs is not greater than the maximum row index, It is determined that the lengths of the pilot sequences in each group are equal and greater than or equal to the maximum row index.
- the pilot sequences allocated for each group are the same length. That is to say, for all pairs in each group, a pilot sequence of the same length is allocated, and the length of the pilot sequence should satisfy the longest required pilot sequence. Group.
- the number of pairs of the group with the largest number of pairs can be compared with the maximum row index. If the maximum number of pairs is greater than the maximum row index, the group with the longest required pilot sequence is the group with the largest number of pairs.
- the length of the frequency sequence is at least the maximum number of pairs, preferably a natural number greater than or equal to 2 of the maximum number of pairs.
- the maximum number of pairs is not greater than the maximum row index, it indicates that the group with the longest required pilot sequence is the group to which the largest row is bound, and the length of the pilot sequence may be set to at least the maximum row index, preferably greater than or A natural power of two equal to the maximum row index.
- each group of pilots is obtained according to the number of pairs in each group and the largest row index in the group. The length of the sequence is then compared to the maximum pilot sequence length.
- the following processing may be further added: if the determined value range of the pilot sequence length includes a preset second threshold value, the pilot sequence is The length of the pilot sequence is set to the second threshold; if the determined range of the pilot sequence does not include the preset second threshold, the length of the pilot sequence is set to be the smallest in the range The natural power of 2's.
- a lower limit of the length of the pilot sequence can be set such that the length of the pilot sequence is not lower than the lower limit of the length, and the preset second threshold value is preferably a natural power of 2.
- Step 103 Estimate the crosstalk channel of each group by using a pilot sequence allocated for each group.
- the DSLAM After allocating the pilot sequences for each group, the DSLAM can estimate the crosstalk channels of each group according to the assigned pilot sequences.
- the DSLAM When estimating the downlink crosstalk channel, the DSLAM modulates and transmits the synchronization symbol on each non-idle pair using the corresponding pilot sequence, and receives the error samples fed back by each terminal, and then according to the analysis of the pilot sequence and the error samples, The downlink crosstalk channel is calculated.
- the DSLAM When estimating the uplink crosstalk channel, the DSLAM allocates a pilot sequence for each line pair, determines a row index of the pilot sequence in the Walsh matrix, and passes each pilot sequence of the preset length corresponding to each row index through a corresponding pair. Notify the terminal to which it is connected. After receiving the notification, the terminal modulates the synchronization symbol according to the received pilot sequence and transmits it to the DSLAM. The DSLAM receives the corresponding error samples and then calculates an uplink crosstalk channel based on the analysis of the pilot sequence and the error samples.
- the terminal only needs to perform modulation transmission of the synchronization symbol according to the pilot sequence of the preset length in the notification, and may not know the length of the pilot sequence allocated by the DSLAM for its line pair.
- the row index of the pilot sequence allocated to each new active line pair in the system remains unchanged in the Walsh matrix, pilot.
- the length of the sequence can be changed.
- the DSLAM can correct the length of the pilot sequence according to its allocation. The poor samples are received.
- the grouping process of non-idle pairs will be described in detail below in conjunction with the line initialization process.
- multiple crosstalk channel estimations may be performed.
- multiple crosstalk channel estimations may also be performed to estimate the crosstalk channels between the paired pairs.
- the crosstalk channels obtained according to these processes can be grouped so that the crosstalk influence data between different sets of line pairs is smaller than the set first threshold value, that is, crosstalk between different groups is considered negligible.
- the condition for increasing the grouping is that the crosstalk influence data between the pair of pairs in the group is greater than or equal to the first threshold value, that is, the pair of lines that cannot be ignored by crosstalk between each other is divided into one group.
- the first uplink crosstalk channel estimation process (after the RP-VECTOR 1 phase (upward direction) in the standard-defined line initialization process can be completed) Obtaining the uplink crosstalk impact data of the new active pair in the system on the paired pair, and the new active line in the system can be obtained after the first downlink crosstalk channel estimation process (OP-VECTOR 1 phase (downward direction))
- the downlink crosstalk affects the uplink line pair. Therefore, preferably, the first uplink crosstalk channel according to the current line initialization process may be ended at the end of the first uplink crosstalk channel estimation process in the current line initialization process.
- the uplink crosstalk impact data between non-idle pairs in the system determined during the estimation process, and the non-idle line pairs in the system are grouped, and the uplink crosstalk impact data between different pairs of pairs is less than the set first threshold ; also the first downlink crosstalk channel estimation process in the current line initialization process When, according to the downlink crosstalk impact data between the non-idle pairs in the system determined in the first downlink crosstalk channel estimation process of the current line initialization process, the non-idle line pairs in the system are grouped, and the different pairs of pairs The downlink crosstalk impact data between is less than the set first threshold.
- the subsequent crosstalk channel estimation process can be performed on the basis of this packet.
- it can also be grouped again in the subsequent process, and a more accurate packet can be obtained.
- the process of line initialization may initialize the uplink channel and the downlink channel respectively, and the uplink channel and the downlink channel use different frequency bands, and the crosstalk channels in different frequency bands are independent of each other, so the uplink crosstalk channel and the downlink crosstalk channel are
- the estimation process can be independent of each other.
- grouping non-idle pairs they can be grouped based on the uplink crosstalk impact data or based on the downlink crosstalk impact data, respectively. The two grouping modes do not affect each other.
- the uplink crosstalk impact data and the downlink crosstalk impact data may be comprehensively considered to be grouped, that is, in the line initialization process, if there is an online line pair in the system, the first time in the current line initialization process Uplink crosstalk channel estimation process and first downlink crosstalk channel estimation At the end of the process, the uplink crosstalk impact data between the non-idle pairs in the system determined according to the first uplink crosstalk channel estimation process in the current line initialization process, and the first downlink crosstalk channel in the current line initialization process The downlink crosstalk impact data between non-idle pairs in the system determined during the estimation process is grouped, and the non-idle line pairs in the system are grouped.
- the uplink crosstalk impact data and downlink crosstalk impact data between different pairs of pairs are smaller than the setting.
- the first threshold is that the condition that the packet can be added.
- the condition that the packet can be added is that the uplink crosstalk impact data between the pairs within the group and/or the downlink crosstalk impact data is greater than or equal to the first threshold. In this way, the line crosstalk that cannot be ignored by each other and/or the downlink crosstalk cannot be ignored is grouped in one group. This packet result can be applied in the subsequent uplink crosstalk channel estimation process and downlink crosstalk channel estimation process.
- the line initialization process may only perform a crosstalk channel estimation process in the uplink (or downlink) direction, and estimate the new active pair between the systems.
- the crosstalk channel after performing an uplink crosstalk channel estimation process and a downlink crosstalk channel estimation process, the new active line pair can be online to become the online line pair.
- the process of grouping can be performed after the line initialization process ends.
- the grouping can also be performed after the line initialization process ends.
- the result can be applied to the subsequent crosstalk channel estimation process during the line-on-line phase (the phase between the two-line initialization process, in which multiple cross-talk channel estimation procedures can be performed).
- the uplink crosstalk impact data between the paired pairs in the determined system is grouped, and the paired pairs in the system are grouped, and the uplink crosstalk impact data between different pairs of pairs is less than the set first threshold;
- the downlink crosstalk impact data between the paired pairs in the system determined in the downlink crosstalk channel estimation process after the end of the line initialization process the paired pairs in the system are grouped, and the pairs between the different pairs are downlinked.
- the crosstalk impact data is less than the set first threshold. Because the crosstalk between the pairs may change after the new active pair is paired, this method can be more accurately grouped.
- the uplink crosstalk impact data and the downlink crosstalk impact data may be comprehensively considered to be grouped, that is, the uplink crosstalk impact data between the paired pairs in the system determined according to the uplink crosstalk channel estimation process performed after the line initialization process ends, And the downlink crosstalk impact data between the paired pairs in the system determined during the downlink crosstalk channel estimation process after the end of the line initialization process, grouping the paired pairs in the system, and the uplinks between the different pairs Crosstalk affects data and downlink crosstalk
- the impact data is less than the set first threshold.
- the condition that the packet can be added is that the uplink crosstalk impact data between the pairs within the group and/or the downlink crosstalk impact data is greater than or equal to the first threshold. In this way, the line crosstalk that cannot be ignored by each other and/or the downlink crosstalk cannot be ignored is grouped in one group.
- the grouping process can be as follows: The crosstalk impact data determined in the previous crosstalk channel estimation process, the non-abnormal non-idle line pairs in the system are grouped, and the crosstalk impact data between the different sets of line pairs is less than the set first threshold; Add to the group with the highest average.
- the crosstalk impact data between the two pairs includes the crosstalk impact data of the first pair to the second pair, and the crosstalk impact data of the second pair on the first pair.
- L1, L2, L3, L4, and L5 there are 5 non-idle pairs L1, L2, L3, L4, and L5 in the system, where L5 is an abnormal line pair. Then, first, group L1, L2, L3, and L4, and assume that they are divided into two groups of Gl and G2.
- the group to which it belongs is determined in the above manner.
- the grouping process in the abnormal situation may also be: grouping non-anomalous non-idle line pairs in the system according to crosstalk impact data determined in the previous crosstalk channel estimation process, and crosstalk effects between different sets of line pairs The data is less than the set first threshold value; determining an average value of each crosstalk impact data of the non-anomalous line pairs for the abnormal line pair; determining a crosstalk effect of the crosstalk impact data that is greater than the average value The pair corresponding to the data, and the abnormal line pair is added to the group to which the pair belongs.
- the foregoing packet based on the uplink crosstalk impact data may be applied in the subsequent uplink crosstalk channel estimation process, and the packet based on the downlink crosstalk impact data may be applied in the subsequent downlink crosstalk channel estimation process, based on the uplink.
- the crosstalk impact data and the downlink crosstalk impact data are grouped, which can be applied to the subsequent uplink crosstalk channel estimation process and the line crosstalk channel estimation process. Medium.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- the embodiment of the present invention provides a crosstalk channel estimation method.
- the crosstalk channel estimation method provided by the embodiment of the present invention is further described in the following with the process of line initialization.
- the system In the circuit initialization process, the system has an online line pair, and the specific processing flow is provided. See Figure 2, including the following steps:
- Step 201 The DSLAM receives an access request sent by the terminal, and performs a handshake process with the terminal.
- the non-idle pairs may not be grouped.
- the pilot sequence allocation can be seen in Figure 3.
- the same pilot sequence is assigned to L1-L6.
- Step 203 The DSLAM groups the non-idle line pairs in the system according to the downlink crosstalk impact data and the uplink crosstalk impact data determined in the crosstalk channel estimation process.
- the uplink crosstalk impact data and the downlink crosstalk impact data between different pairs of line pairs are smaller than the set first threshold, and the uplink crosstalk impact data and/or downlink crosstalk impact data between the pairs within the group are not less than the First threshold.
- the DSLAM may first obtain the number of pairs of pairs in each group under the current group. Then, the DSLAM allocates a pilot sequence to each group according to the number of pairs in each group. Thereafter, the DSLAM estimates the crosstalk channels of each group based on the pilot sequences allocated for each group.
- Step 205 In the R-P-VECTOR 2 and 0-P-VECTOR 2-1 phases, the DSLAM estimates the uplink and downlink crosstalk channels of all pairs in each group based on the foregoing grouping.
- the specific process is as above, and no further description is made.
- the pilot sequence is allocated a frequency sequence.
- the new active line pair does not use the row index in step 202
- FIG. 5 In the illustrated allocation mode, the new active line pair uses the row index in step 202.
- the paired pairs in the group are assigned mutually orthogonal pilot sequences.
- the newly activated pair becomes the paired line pair, and the line initialization is completed. At this stage, channel analysis and data interaction can be performed.
- the DSLAM can also estimate the crosstalk channel of all the uplink pairs in the system, and group the paired pairs according to the uplink crosstalk impact data and the downlink crosstalk impact data obtained in the crosstalk channel estimation process. And based on the result of the new packet, a subsequent crosstalk channel estimation of the line-on-line phase (the phase between the two-line initialization process in which multiple cross-talk channel estimation processes can be performed) is performed.
- the crosstalk cancellation coefficient can be further calculated, and according to the crosstalk cancellation coefficient, the signal received and transmitted in the subsequent data transmission process by the online line pair in the system can be processed to Reduce system crosstalk.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- the embodiment of the present invention provides a crosstalk channel estimation method.
- the crosstalk channel estimation method provided by the embodiment of the present invention is further described in the following steps: the line initialization process and the subsequent line uplink phase.
- the system does not exist in the line initialization process.
- Wire pair, the specific processing flow can be seen in Figure 6, including the following steps: Step 601:
- the DSLAM receives an access request sent by the terminal, and performs a handshake process with the terminal.
- Step 602 in the RP-VECTOR 2 and 0-P-VECTOR 2-1 phases, the DSLAM estimates the uplink and downlink crosstalk channels between all new active pairs.
- Step 603 the newly activated line pair becomes the online line pair, and the line initialization is completed. At this stage, channel analysis and data interaction can be performed.
- Step 604 The DSLAM estimates the uplink and downlink crosstalk channels of all the uplink pairs in the system, and groups the uplink pairs according to the uplink crosstalk impact data and the downlink crosstalk impact data obtained by the crosstalk channel estimation process.
- Step 605 The DSLAM performs subsequent crosstalk channel estimation on the line uplink phase (the phase between the two line initialization processes, in which multiple crosstalk channel estimation processes can be performed) according to the result of the new packet.
- the crosstalk cancellation coefficient can be further calculated, and according to the crosstalk cancellation coefficient, the signal received and transmitted in the subsequent data transmission process by the online line pair in the system can be processed to Reduce system crosstalk.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- the server includes:
- the grouping module 710 is configured to group the non-idle line pairs in the system according to the crosstalk impact data determined in the previous crosstalk channel estimation process, and the crosstalk impact data between the different sets of line pairs is less than the set first threshold value. ;
- the obtaining module 720 is configured to obtain the number of pairs of pairs in each group under the current grouping
- the allocating module 730 is configured to allocate a pilot sequence to each group according to the number of pairs in each group, and at least one pair of pilot sequences that are not orthogonal to each other between different groups;
- the estimation module 740 is configured to estimate a crosstalk channel of each group by using a pilot sequence allocated for each group.
- the allocating module 730 is specifically configured to:
- pilot sequence When a pilot sequence is assigned to each group, there is at least one pair of identical pilot sequences between the different groups.
- the allocating module 730 is specifically configured to:
- all pilot sequences assigned to each group are the same as one pilot sequence in each pilot sequence of the group in which the number of pilot sequences is assigned the most.
- the estimating module 740 is specifically configured to estimate a crosstalk channel of the paired line pair for the new active line pair in each group group;
- the distribution module 730 is specifically configured to:
- a new pilot line pair is assigned a number of pilot sequences for the number of new active line pairs
- the estimating module 740 is specifically configured to estimate a crosstalk channel between all pairs in each group;
- the allocating module 730 is specifically configured to: allocate, for each pair in the group, a pilot sequence whose number is the number of pairs in the group.
- the row index of the pilot sequence allocated to each new active pair in the system in the uplink crosstalk channel estimation process remains unchanged in the Walsh matrix
- the allocating module 730 is specifically configured to:
- the group in which the number of pairs in the group is greater than the maximum row index of the new active pair in the group, and the group not including the newly activated pair determine that the length of the pilot sequence in the group is greater than or equal to the number of pairs in the group
- the row index of the pilot sequence allocated to each new active pair in the system in the uplink crosstalk channel estimation process remains unchanged in the Walsh matrix
- the allocating module 730 is specifically configured to: Obtaining a maximum row index of a pilot sequence allocated to each new active pair in the system in the Walsh matrix during the first uplink crosstalk channel estimation process of the current line initialization process;
- the distribution module 730 is further configured to:
- the length of the pilot sequence is set to the second threshold
- the length of the pilot sequence is set to the minimum natural power of 2 in the range of values.
- the grouping module 710 is specifically configured to:
- the first uplink crosstalk channel estimation process and the first downlink crosstalk channel estimation process are completed at the end of the line initialization process, according to the current line initialization.
- the uplink crosstalk impact data between non-idle pairs in the system determined during the first uplink crosstalk channel estimation process of the process, and the non-idle line in the system determined during the first downlink crosstalk channel estimation process of the current line initialization process The downlink crosstalk between the pair affects the data, and the non-idle pairs in the system are grouped, and the uplink crosstalk impact data and the downlink crosstalk impact data between the pairs of the different groups are smaller than the set first threshold; or
- the system is online.
- the downlink crosstalk between the pairs affects the data, and the paired pairs in the system are grouped.
- the uplink crosstalk impact data and the downlink crosstalk impact data between the different pairs are less than the set first threshold.
- the grouping module 710 is specifically configured to:
- the non-abnormal non-idle line pairs in the system are grouped, and the crosstalk impact data between the different sets of line pairs is less than the set first threshold value; An abnormal line pair is added to the group with the largest average; or
- Non-idle pairs are grouped, and the crosstalk impact data between different pairs of pairs is less than the set first threshold, and the pair corresponding to the crosstalk impact data of the crosstalk impact data is determined, and the An abnormal line pair is added to the group to which the pair belongs.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- the server includes a processor 810 and a memory 820.
- the processor 810 and the memory 820 are configured to perform the following operations:
- the non-idle line pairs in the system are grouped, and the crosstalk impact data between different pairs of line pairs is smaller than the set first threshold value;
- the number of pairs in the group according to the number of pairs in each group, the pilot sequence ⁇ is assigned to each group, and at least one pair of pilot sequences that are not orthogonal to each other between different groups; using the pilot sequence assigned to each group Ij , estimating the crosstalk channel of each group.
- At least one pair of pilot sequences that are not orthogonal to each other between the different groups is specifically: at least one pair of identical pilot sequences between different groups.
- At least one pair of the same pilot sequence between the different groups is specifically:
- All pilot sequences assigned to each group are identical to one of the pilot sequences in the group with the largest number of assigned pilot sequences.
- the estimating the crosstalk channel of each group specifically, estimating the crosstalk channel of the pair of uplink lines for the new active line pair in each group;
- the assigning a pilot sequence to each group according to the number of pairs in each group is specifically:
- a new pilot line pair is assigned a number of pilot sequences for the number of new active line pairs; For groups that only have online pairs, assign the same pilot sequence to the paired pairs.
- the estimating the crosstalk channel of each group is specifically estimating the crosstalk channel between all pairs in each group;
- the pilot sequence is assigned to each group according to the number of pairs in each group, and is specifically: a pilot sequence in which the number of pairs in the group is assigned to each pair in the group.
- the row index of the pilot sequence allocated to each new active pair in the system in the uplink crosstalk channel estimation process remains unchanged in the Walsh matrix
- the method for determining the length of the pilot sequence in each group includes:
- the group in which the number of pairs in the group is greater than the maximum row index of the new active pair in the group, and the group not including the newly activated pair determine that the length of the pilot sequence in the group is greater than or equal to the number of pairs in the group
- the row index of the pilot sequence allocated to each new active pair in the system in the uplink crosstalk channel estimation process remains unchanged in the Walsh matrix
- the method for determining the length of the pilot sequence in each group includes:
- the method further includes:
- the length of the pilot sequence is set to the second threshold
- the length of the pilot sequence is set to the minimum natural power of 2 in the range of values.
- the crosstalk impact data determined according to the previous crosstalk channel estimation process are grouped, and the crosstalk impact data between the pairs of different groups is less than the set first threshold, specifically:
- the first uplink crosstalk channel estimation process and the first downlink crosstalk channel estimation process are completed at the end of the line initialization process, according to the current line initialization.
- the uplink crosstalk impact data between non-idle pairs in the system determined during the first uplink crosstalk channel estimation process of the process, and the non-idle line in the system determined during the first downlink crosstalk channel estimation process of the current line initialization process The downlink crosstalk between the pair affects the data, and the non-idle pairs in the system are grouped, and the uplink crosstalk impact data and the downlink crosstalk impact data between the pairs of the different groups are smaller than the set first threshold; or
- the system is online.
- the downlink crosstalk between the pairs affects the data, and the paired pairs in the system are grouped.
- the uplink crosstalk impact data and the downlink crosstalk impact data between the different pairs are less than the set first threshold.
- the crosstalk impact data determined in the previous crosstalk channel estimation process is grouped into non-idle line pairs in the system, and different sets of line pairs are The crosstalk impact data is less than the set first threshold, specifically:
- the non-abnormal non-idle line pairs in the system are grouped, and the crosstalk impact data between the different sets of line pairs is less than the set first threshold value; An abnormal line pair is added to the group with the largest average; or
- non-abnormal non-idle line pairs in the system are grouped, and crosstalk impact data between different sets of line pairs is less than the set first threshold to determine the crosstalk effects
- the crosstalk in the data that is greater than the average affects the pair of lines corresponding to the data, and adds the pair of abnormal lines to the group to which the pair belongs.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- an embodiment of the present invention provides a crosstalk channel estimation system.
- a terminal 910 and a server 920 according to the foregoing embodiment are provided, where: the terminal 910 is configured to: 920: transmit a pilot sequence ⁇ ij previously notified by the server 920; or receive an error sample of a pilot sequence sent by the server 920, and send the error sample to the server 920.
- the non-idle line pair in the system is divided into a plurality of groups whose crosstalk can be neglected, because the crosstalk between the groups can be neglected, so each group can be regarded as an independent system.
- assigning a pilot sequence there are at least one pair of pilot sequences that are not orthogonal to each other between different groups, reducing the number of pilot sequences that are mutually orthogonal, and thus the length of the pilot sequence required for crosstalk channel estimation. It can also be shortened, so the time required for the estimation process of the crosstalk channel can be shortened.
- the crosstalk channel estimation apparatus provided by the foregoing embodiment estimates the crosstalk channel, only the division of each functional module is used as an example.
- the foregoing functions may be assigned different functions according to requirements.
- the module is completed, dividing the internal structure of the device into different functional modules to perform all or part of the functions described above.
- the cross-talk channel estimation apparatus and the cross-talk channel estimation method provided in the foregoing embodiments are in the same concept, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.
- a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
- the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.
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Abstract
本发明公开了一种串扰信道估计方法、装置和系统,属于网络技术领域。所述方法包括:根据之前的串扰信道估计过程中确定的串扰影响数据,对系统中的非闲置线对进行分组,不同组的线对之间的串扰影响数据小于设置的第一门限值;获取当前分组下各组中线对的数目;根据各组中线对的数目,为各组分配导频序列,不同组之间至少有一对不相互正交的导频序列;使用为各组分配的导频序列,对各组的串扰信道进行估计。采用本发明,可以缩短串扰信道的估计过程所需要的时间。
Description
一种串扰信道估计方法、 装置和系统 技术领域
本发明涉及网络技术领域, 特别涉及一种串扰信道估计方法、 装置和系统。 背景技术
xDSL ( X Digital Subscriber Line, 各种类型的数字用户线路 )是一种在电话 双绞线传输的高速数据传输技术,采用离散多音频调制。提供多路 xDSL接入的 系统叫做 DSLAM ( DSL Access Multiplexer, DSL接入复用器), 由于电磁感应 原理, DSLAM接入的多条线对承载的多路信号之间, 会相互产生干扰, 称为串 扰, 串扰可以分为 NEXT ( Near End Cross-Talk, 近端串扰 )和 FEXT ( Far End Cross-Talk,远端串扰),近端串扰是设备的接收信号受到近端设备的发射信号的 干扰, 远端串扰是设备的接收信号受到的远端设备的发射信号的干扰。 xDSL的 上下行信道采用频分复用, 所以, 近端串扰对系统的性能不产生太大的影响, 一般可以忽略不计。 而远端串扰会对信道速率产生严重的影响, 造成系统不稳 定, 甚至线路无法开通。
现有技术中提出了串扰抵消 ( Vectored-DSL )技术, 用于降低或消除 FEXT , 主要利用在 DSLAM端进行联合的收发的可能性, 对串扰信道进行估计, 即对 各信道之间的传输函数进行测算, 并进一步计算上行或下行的串扰抵消系数, 根据串扰抵消系数对信号进行处理, 来抵消 FEXT的干扰。 Vectored-DSL技术 中串扰信道的估计和串扰抵消系数的计算过程, 在用户接入网络时的线路初始 化过程中以及线路初始化过程结束之后会反复被应用。
串扰信道 H在频域的任一个 tone (载波)上可以通过矩阵的形式表示, 矩 阵中第 i行第 j列的元素用于表示线对 j到线对 i的传输函数(线对 j的发送端到 线对 i的接收端的传输函数, 可以反映线对 j的发送信号对线对 i产生的串扰)。 在 Vectored-DSL技术中, 为每个线对选择导频序列, 导频序列可以是一个由 0、 1组成的二进制数字序列, 以向量形式表示的导频序列是一个由 -1、 1组成的向 量(其中, 向量的元素 1对应二进制数字 0, 向量的元素 -1对应二进制数字 1 ), 为了更加准确的计算出串扰信道, 各线对的导频序列相互正交。 在每个线对上, 依次分别使用导频序列中的每一比特对同步符号( sync symbol )进行调制发送, 接收端在各同步符号上接收经过串扰而得到的误差样本( error sample )。 通过对
各个线对上导频序列和误差样本的分析, 可以计算出串扰信道 H, 进而可以得 出串扰抵消系数。
上述过程中, 为了更准确的计算出串扰信道, 各导频序列的长度应该大于 或等于系统中新激活 (join )线对和已上线(showtime )线对的总数(另外, 导 频序列长度还应是 2的自然数次幂)。 系统在每个线对上, 顺序使用相应导频序 列的每个比特位对同步符号进行调制发送(使用第一个比特对第一个同步符号 进行调制发送, 使用第二个比特对第二个同步符号进行调制发送, 依此类推), 所以, 一次串扰信道估计过程需要的同步符号的个数与导频序列的长度相同。
在实现本发明的过程中, 发明人发现现有技术至少存在以下问题: 系统一般按一定的周期发送符号 (如 4000symbol/s、 8000symbol/s等), 每 发送一定数量(如 256 )的数据符号, 发送一个同步符号, 假设导频序列的长度 为 n, 系统需要 n个同步符号才能完成一次串扰信道估计的过程, 可见, 一次串 扰信道估计过程所需要的时间与导频序列的长度成正比。 基于现有的 Vectored-DSL技术, 导频序列的长度至少为系统中新激活线对和已上线线对的 总数, 而当系统中的新激活线对和已上线线对的数量较多时, 则会导致串扰信 道的估计过程所需要的时间较长, 而且, 新激活线对的激活上线的过程需要进 行多次串扰信道的估计和串扰抵消系数的计算过程, 所以也将导致新激活线对 的激活上线的过程十分的漫长。 发明内容
为了解决现有技术的问题, 本发明实施例提供了一种串扰信道估计方法、 装置和系统, 以缩短串扰信道的估计过程所需要的时间。 所述技术方案如下: 一方面, 提供了一种串扰信道估计方法, 根据之前的串扰信道估计过程中 确定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的线对之间的 串扰影响数据小于设置的第一门限值, 所述方法包括:
获取当前分组下各组中线对的数目;
根据各组中线对的数目, 为各组分配导频序列, 不同组之间至少有一对不 相互正交的导频序列;
使用为各组分配的导频序列, 对各组的串扰信道进行估计。
优选的, 所述不同组之间至少有一对不相互正交的导频序列, 具体为: 不同组之间至少有一对相同的导频序列。
优选的, 所述不同组之间至少有一对相同的导频序列, 具体为: 为每个组分配的所有导频序列, 都与分配导频序列数目最多的组的各导频 序列中的一个导频序列相同。
优选的, 所述对各组的串扰信道进行估计, 具体为对各组组内的新激活线 对对已上线线对的串扰信道进行估计;
所述根据各组中线对的数目, 为各组分配导频序列, 具体为:
对于包含新激活线对和已上线线对的组, 为已上线线对分配同一个导频序 列, 并为新激活线对分配数目为新激活线对数目的导频序列;
对于只包含新激活线对的组, 为新激活线对分配数目为新激活线对数目的 导频序列;
对于只包含已上线线对的组, 为已上线线对分配同一个导频序列。
优选的, 所述对各组的串扰信道进行估计, 具体为对各组组内的所有线对 之间的串扰信道进行估计;
所述根据各组中线对的数目, 为各组分配导频序列, 具体为: 为组内各线 对分配数目为组内线对数目的导频序列。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中 各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 根据各组中线对的数目, 为各组分配导频序 列时, 确定各组中导频序列的长度的方法包括:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的行索引;
对于组中线对的数目大于组中新激活线对的最大行索引的组, 以及不包含 新激活线对的组, 确定组中导频序列的长度大于或等于组中线对的数目;
对于组中线对的数目不大于组中新激活线对的最大行索引的组, 确定组中 导频序列的长度大于或等于组中新激活线对的最大行索引。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中 各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 根据各组中线对的数目, 为各组分配导频序 列时, 确定各组中导频序列的长度的方法包括:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的最大行索引;
如果线对数目最大的组的线对数目大于所述最大行索引, 则确定各组中导 频序列的长度相等, 且大于或等于该最大的线对数目;
如果线对数目最大的组的线对数目不大于所述最大行索引, 则确定各组中 导频序列的长度相等, 且大于或等于所述最大行索引。
优选的, 其特征在于, 还包括:
如果确定出的导频序列长度的取值范围包含预设的第二门限值, 则将该导 频序列的长度设置为所述第二门限值;
如果确定出的导频序列长度的取值范围不包含预设的第二门限值, 则将该 导频序列的长度设置为该取值范围内最小的 2的自然数幂。
优选的, 所述根据之前的串扰信道估计过程中确定的串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第 一门限值, 具体为:
在线路初始化过程中, 如果系统中存在已上线线对, 则在本次线路初始化 过程中的第一次上行串扰信道估计过程和第一次下行串扰信道估计过程都结束 时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确定的系统中 非闲置线对之间的上行串扰影响数据, 以及本次线路初始化过程的第一次下行 串扰信道估计过程中确定的系统中非闲置线对之间的下行串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值; 或者,
根据线路初始化过程结束后进行的上行串扰信道估计过程中确定的系统中 已上线线对之间的上行串扰影响数据, 以及线路初始化过程结束后进行的下行 串扰信道估计过程中确定的系统中已上线线对之间的下行串扰影响数据, 对系 统中的已上线线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值。
优选的, 当系统的非闲置线对中有异常线对时, 所述根据之前的串扰信道 估计过程中确定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的 线对之间的串扰影响数据小于设置的第一门限值, 具体为:
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 值; 将所述异常线对加入到平均值最大的组中; 或者,
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 确定所述各串扰影响数据中大于所述平均值的串扰影响数据对应的线对, 并将 所述异常线对加入到该线对所属的组中。
另一方面, 提供了一种服务器, 所述服务器包括:
分组模块, 用于根据之前的串扰信道估计过程中确定的串扰影响数据, 对 系统中的非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的 第一门限值;
获取模块, 用于获取当前分组下各组中线对的数目;
分配模块, 用于根据各组中线对的数目, 为各组分配导频序列, 不同组之 间至少有一对不相互正交的导频序列;
估计模块, 用于使用为各组分配的导频序列, 对各组的串扰信道进行估计。 优选的, 所述分配模块, 具体用于:
为各组分配导频序列时, 不同组之间至少有一对相同的导频序列。
优选的, 所述分配模块, 具体用于:
为各组分配导频序列时, 为每个组分配的所有导频序列, 都与分配导频序 列数目最多的组的各导频序列中的一个导频序列相同。
优选的, 所述估计模块, 具体用于对各组组内的新激活线对对已上线线对 的串扰信道进行估计;
所述分配模块, 具体用于:
对于包含新激活线对和已上线线对的组, 为已上线线对分配同一个导频序 列, 并为新激活线对分配数目为新激活线对数目的导频序列;
对于只包含新激活线对的组, 为新激活线对分配数目为新激活线对数目的 导频序列;
对于只包含已上线线对的组, 为已上线线对分配同一个导频序列。
优选的, 所述估计模块, 具体用于对各组组内的所有线对之间的串扰信道 进行估计; 序列。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中
各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变; 在上行串扰信道估计过程中, 所述分配模块, 具体用于:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的行索引;
对于组中线对的数目大于组中新激活线对的最大行索引的组, 以及不包含 新激活线对的组, 确定组中导频序列的长度大于或等于组中线对的数目;
对于组中线对的数目不大于组中新激活线对的最大行索引的组, 确定组中 导频序列的长度大于或等于组中新激活线对的最大行索引。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中 各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 所述分配模块, 具体用于:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的最大行索引;
如果线对数目最大的组的线对数目大于所述最大行索引, 则确定各组中导 频序列的长度相等, 且大于或等于该最大的线对数目;
如果线对数目最大的组的线对数目不大于所述最大行索引, 则确定各组中 导频序列的长度相等, 且大于或等于所述最大行索引。
优选的, 所述分配模块, 还用于:
如果确定出的导频序列长度的取值范围包含预设的第二门限值, 则将该导 频序列的长度设置为所述第二门限值;
如果确定出的导频序列长度的取值范围不包含预设的第二门限值, 则将该 导频序列的长度设置为该取值范围内最小的 2的自然数幂。
优选的, 所述分组模块, 具体用于:
在线路初始化过程中, 如果系统中存在已上线线对, 则在本次线路初始化 过程中的第一次上行串扰信道估计过程和第一次下行串扰信道估计过程都结束 时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确定的系统中 非闲置线对之间的上行串扰影响数据, 以及本次线路初始化过程的第一次下行 串扰信道估计过程中确定的系统中非闲置线对之间的下行串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值; 或者,
根据线路初始化过程结束后进行的上行串扰信道估计过程中确定的系统中
已上线线对之间的上行串扰影响数据, 以及线路初始化过程结束后进行的下行 串扰信道估计过程中确定的系统中已上线线对之间的下行串扰影响数据, 对系 统中的已上线线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值。
优选的, 当系统的非闲置线对中有异常线对时, 所述分组模块, 具体用于: 根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 值; 将所述异常线对加入到平均值最大的组中; 或者,
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 确定所述各串扰影响数据中大于所述平均值的串扰影响数据对应的线对, 并将 所述异常线对加入到该线对所属的组中。
另一方面, 提供了一种串扰信道估计系统, 包括终端和如上所述的服务器, 其巾: 所述终端用于: 向所述服务器发送所述服务器预先通知的导频序列; 或者, 接 收所述服务器发送的导频序列的误差样本, 并将所述误差样本发送给所述服务 器。
本发明实施例提供的技术方案带来的有益效果是:
本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中所 需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明 的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下,
还可以根据这些附图获得其他的附图。
图 1是本发明实施例提供的一种串扰信道估计方法流程图;
图 2是本发明实施例提供的一种串扰信道估计方法流程图;
图 3是本发明实施例提供的一种导频序列分配结果示意图;
图 4是本发明实施例提供的一种导频序列分配结果示意图;
图 5是本发明实施例提供的一种导频序列分配结果示意图;
图 6是本发明实施例提供的一种串扰信道估计方法流程图;
图 7是本发明实施例提供的一种服务器结构示意图;
图 8是本发明实施例提供的一种服务器结构示意图;
图 9是本发明实施例提供的一种串扰信道估计系统结构示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明 实施方式作进一步地详细描述。
实施例一
本发明实施例提供了一种串扰信道估计方法, 该方法预先根据之前的串扰 信道估计过程中确定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同 组的线对之间的串扰影响数据小于设置的第一门限值, 参照图 1 , 该方法的处理 流程可以包括以下步骤:
步骤 101 , 获取当前分组下各组中线对的数目。
步骤 102, 根据各组中线对的数目, 为各组分配导频序列, 不同组之间至少 有一对不相互正交的导频序列。
步骤 103 , 使用为各组分配的导频序列, 对各组的串扰信道进行估计。 本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。 实施例二
本发明实施例提供了一种串扰信道估计方法, 该方法可以由网络侧的
DSLAM来控制执行, 其中, 在导频序列确定之后, 后续的串扰信道估计过程可 以有终端参与进行。 在该方法中, 可以预先根据之前的串扰信道估计过程中确 定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的线对之间的串 扰影响数据小于设置的第一门限值。 串扰影响数据是用于表示各线对之间串扰 绝对值, 或者是串扰抵消系数的绝对值乘以预设的系数。 这里, 第一门限值可 以是预先设置的数值, 另外, 优选的, 第一门限值可以是各非闲置线对之间串 扰影响数据的平均值与预设的调整因子(如, 可以设置为 1 ) 的乘积。
系统中的线对可以分为新激活线对、 已上线线对和闲置(idle )线对, 新激 活线对是连接请求接入网络并正在进行初始化的终端的线对, 已上线线对是已 经接入网络正在工作的线对, 闲置线对是没有请求接入网络而处于闲置状态的 已上线线对又可统称为非闲置线对。 后面将对非闲置线对的分组过程进行详细 说明。
基于上述的分组, 下面将对图 1 所示的串扰信道估计方法流程进行详细的 阐述, 该方法的处理流程可以包括以下步骤:
步骤 101 , 获取当前分组下各组中线对的数目。
DSLAM对于某个频带, 在每次进行分组后, 可以记录分组的相关信息, 如 每组中包含哪些线对、 每组中线对的数目等, 并可以用新记录的分组信息替换 掉旧的分组信息。 后续的串扰信道估计过程可以基于该频带最近的一次分组进 行。
步骤 102, 根据各组中线对的数目, 为各组分配导频序列, 不同组之间至少 有一对不相互正交的导频序列。 不同组之间使用不相互正交的导频序列, 可以
不同, 那么组与组之间所有导频序列都不相互正交。
如果为各组分配相同长度的导频序列, 那么不同组之间至少有一对相同的 导频序列。 优选的, 为每个组分配的所有导频序列, 可以都与分配导频序列数 目最多的组的各导频序列中的一个导频序列相同。 这样, 为所有线对分配的导 频序列中相互正交的导频序列的数目, 即为分配导频序列的总数目, 也即为分 配导频序列数目最多的组的导频序列数目。
在线路初始化过程中, 可以进行多次串扰信道估计过程, 这些串扰信道估 计过程可以是估计新激活线对对已上线线对的串扰信道, 也可以是估计所有非 闲置线对之间的串扰信道。 例如, 标准规定的线路初始化过程中, R-P-VECTOR 1、 R-P- VECTOR 1-1、 R-P-VECTOR 1-2阶段是估计新激活线对对已上线线对的 上行串扰信道, 0-P- VECTOR 1、 0-P- VECTOR 1-1、 O-P-VECTOR 2阶段是估 计新激活线对对已上线线对的下行串扰信道, R-P-VECTOR 2阶段是估计所有非 闲置线对之间的上行串扰信道, 0-P-VECTOR 2-1阶段是估计所有非闲置线对之 间的下行串扰信道。 上述这些串扰信道估计过程都可以基于分组来进行。
具体的 , 在对各组组内的新激活线对对已上线线对的串扰信道进行估计时, 步骤 102对于不同组的处理可以具体如下: 对于包含新激活线对和已上线线对 的组, 为已上线线对分配同一个导频序列, 并为新激活线对分配数目为新激活 线对数目的导频序列; 对于只包含新激活线对的组, 为新激活线对分配数目为 新激活线对数目的导频序列; 对于只包含已上线线对的组, 为已上线线对分配 同一个导频序列。
这时, 同组的各导频序列之间相互正交, 而不同的组之间可以使用相同的 导频序列也可以使用不同的导频序列。 同组内的已上线线对可以使用相同的导 频序列也可以使用相互正交的导频序列, 已上线线对和新激活线对的导频序列 相互正交。 所以, 组的导频序列的数目最少可以是该组内新激活线对数加 1。
具体的, 在对各组组内的所有线对 (即组内所有非闲置线对)之间的串扰 信道进行估计时, 步骤 102 的处理可以具体如下: 为组内各线对分配数目为组 内线对数目的导频序列。
为了准确的估计组内各线对之间的串扰信道, 可以为组内各线对分配相互 正交的导频序列。 每个组使用的导频序列可以相同也可以不同。 例如, L1属于 Gl , L2属于 G2, L1和 L2使用的导频序列可以相同。
因为 Walsh矩阵各行的向量相互正交, 所以可以使用 Walsh矩阵的一行作 为一个导频序列, 可以使用行索引来标识导频序列对应的是 Walsh矩阵的哪一 行, 行索引为 1则对应第一行, 行索引为 2则对应第二行, 依此类推。
另外需要指出的是,对于不同阶的 Walsh矩阵,低阶 Walsh矩阵与高阶 Walsh 矩阵左上角各元素是相同的, 例如四阶 Walsh矩阵的前两行两列即为一个二阶 Walsh矩阵,所以,不同阶的 Walsh矩阵在任意相同行上的前 n个元素是相同的。
在某些情况下, 可以在一次线路初始化过程中, 每次上行串扰信道估计过
程为系统中各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变。 根据上述不同阶 Walsh矩阵具有的特性可知, 对应行索引相同的各导频序列的 前 n位是相同的。 这样, DSLAM在第一次上行串扰信道估计过程中, 可以在选 取导频序列后确定其在 Walsh矩阵中的行索引, 再将该行索引对应的预设长度 (一般选择一个较大的长度, 如 512位) 的导频序列通知给终端, 后续的每次 上行串扰信道估计过程, DSLAM无需重新选择导频序列, 也无需向终端发送通 知。 在这种情况下, 在上行串扰信道估计过程中, 根据各组中线对的数目, 为 各组分配导频序列时, 确定各组中导频序列的长度的方法可以如下:
方法一, 获取本次线路初始化过程的第一次上行串扰信道估计过程中为系 统中各新激活线对分配的导频序列在 Walsh矩阵中的行索引; 对于组中线对的 数目大于组中新激活线对的最大行索引的组, 以及不包含新激活线对的组, 确 定组中导频序列的长度大于或等于组中线对的数目; 对于组中线对的数目不大 于组中新激活线对的最大行索引的组, 确定组中导频序列的长度大于或等于组 中新激活线对的最大行索引。 其中, 本次线路初始化过程即正在进行的线路初 始化过程或刚结束的线路初始化过程。
基于方法一, 为各组分配的导频序列长度可以不相同。 对于每个组, 因为 要保持为新激活线对选取导频序列的行索引不变, 而且要保证组内导频序列的 相互正交, 所以其导频序列的长度至少为该组内新激活线对的最大行索引。 而 且, 导频序列的长度需要设置为 2 的自然数舉。 所以优选的, 导频序列长度可 以设置为大于或等于该最大行索引的 2 的自然数幂。 而对于某些组, 如果其组 内线对的数目大于该最大行索引, 则为了保证组内导频序列的相互正交, 其导 频序列的长度可以至少为组内线对的数目。 这时优选的, 导频序列长度可以设 置为大于或等于组内线对数目的 2的自然数幂。
方法二, 获取本次线路初始化过程的第一次上行串扰信道估计过程中为系 统中各新激活线对分配的导频序列在 Walsh矩阵中的最大行索引; 如果线对数 目最大的组的线对数目大于该最大行索引, 则确定各组中导频序列的长度相等, 且大于或等于该最大的线对数目; 如果线对数目最大的组的线对数目不大于该 最大行索引, 则确定各组中导频序列的长度相等, 且大于或等于所述最大行索 引。
基于方法二, 为各组分配的导频序列长度相同。 也就是说为各组中所有线 对分配相同长度的导频序列, 那么导频序列的长度应满足需求导频序列最长的
组。 可以将线对数目最大的组的线对数目与最大行索引进行比较, 如果最大线 对数目大于最大行索引, 则说明需求导频序列最长的组为线对数目最大的组, 可以设置导频序列的长度至少为该最大线对数目, 优选为大于或等于该最大线 对数目的 2 的自然数舉。 如果最大线对数目不大于最大行索引, 则说明需求导 频序列最长的组为该最大行索弓 ]所属的组, 可以设置导频序列的长度至少为该 最大行索引, 优选为大于或等于该最大行索引的 2的自然数幂。
另外, 为了使导频序列的长度满足需求导频序列最长的组, 也可以参考方 法一种的方法, 根据各组组内的线对数目和组内最大行索引, 获取各组对导频 序列长度的需求, 然后比较得出最大的导频序列长度。
优选的, 对于上述方法一和方法二中的处理方式, 还可以增加以下的处理: 如果确定出的导频序列长度的取值范围包含预设的第二门限值, 则将该导频序 列的长度设置为该第二门限值; 如果确定出的导频序列长度的取值范围不包含 预设的第二门限值, 则将该导频序列的长度设置为该取值范围内最小的 2 的自 然数幂。 采用这种处理, 可以设置一个导频序列长度的下限, 使导频序列的长 度不低于该长度下限, 该预设的第二门限值优选为 2的自然数幂。
步骤 103 , 使用为各组分配的导频序列, 对各组的串扰信道进行估计。
DSLAM在为各组分配完导频序列后, 则可以根据分配的导频序列, 对各组 的串扰信道进行估计。
在对下行串扰信道进行估计时, DSLAM在各非闲置线对上使用相应的导频 序列对同步符号进行调制发送, 并接收各终端反馈的误差样本, 然后根据导频 序列和误差样本的分析, 计算出下行串扰信道。
在对上行串扰信道进行估计时, DSLAM为各线对分配导频序列后, 确定导 频序列在 Walsh矩阵中的行索引, 将各行索引对应的预设长度的各导频序列通 过相应的线对通知其连接的终端。 终端在接收到通知后, 则根据其接收到的导 频序列,对同步符号进行调制并向 DSLAM发送。 DSLAM接收相应的误差样本, 然后根据导频序列和误差样本的分析, 计算出上行串扰信道。
这里, 终端只需根据通知中预设长度的导频序列, 进行同步符号的调制发 送, 而可以不知道 DSLAM 实际为其线对分配的导频序列的长度。 这样, 对于 步骤 102 中所述的在一次线路初始化过程中每次上行串扰信道估计过程为系统 中各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变的情况, 导 频序列的长度是可以变化的, DSLAM可以根据其分配的导频序列的长度, 对误
差样本进行接收。
下面将结合线路初始化过程, 对非闲置线对的分组过程进行详细说明。 在线路初始化过程中, 可以进行多次串扰信道估计, 在线路初始化过程结 束后, 也可以进行多次串扰信道估计, 估计各已上线线对之间的串扰信道。 根 据这些过程获取到的串扰信道可以进行分组, 使不同组的线对之间的串扰影响 数据小于设置的第一门限值, 即认为不同组之间的串扰可以忽略。 另外, 还可 以增加分组的条件是, 组内线对之间的串扰影响数据大于或等于第一门限值, 即将相互间串扰不能忽略的线对分在一组。
具体的, 在线路初始化过程中, 如果系统中存在已上线线对, 那么在第一 次上行串扰信道估计过程(标准定义的线路初始化过程中的 R-P-VECTOR 1阶 段(上行方向) 结束之后就可以获取到系统中新激活线对对已上线线对的上行 串扰影响数据, 在第一次下行串扰信道估计过程 ( O-P-VECTOR 1 阶段(下行 方向))结束之后就可以获取到系统中新激活线对对已上线线对的下行串扰影响 数据。 所以, 优选的, 可以在本次线路初始化过程中的第一次上行串扰信道估 计过程结束时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确 定的系统中非闲置线对之间的上行串扰影响数据, 对系统中的非闲置线对进行 分组, 不同组的线对之间的上行串扰影响数据小于设置的第一门限值; 也可以 在本次线路初始化过程中的第一次下行串扰信道估计过程结束时, 根据本次线 路初始化过程的第一次下行串扰信道估计过程中确定的系统中非闲置线对之间 的下行串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的线对之间的 下行串扰影响数据小于设置的第一门限值。
这样, 后续的串扰信道估计过程可以在此分组的基础上进行, 当然, 也可 以在后续的过程中, 再次进行分组, 可以得到更加准确的分组。
线路初始化的过程可以分别对上行信道和下行信道进行初始化, 上行信道 和下行信道使用不同的频段, 线对之间在不同的频段上的串扰信道相互独立, 所以上行串扰信道和下行串扰信道的估计过程可以相互独立。 在对非闲置线对 进行分组时, 可以分别基于上行串扰影响数据或基于下行串扰影响数据进行分 组, 两种分组方式互不影响。
另外, 优选的, 也可以综合考虑上行串扰影响数据和下行串扰影响数据, 进行分组, 即在线路初始化过程中, 如果系统中存在已上线线对, 则在本次线 路初始化过程中的第一次上行串扰信道估计过程和第一次下行串扰信道估计过
程都结束时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确定 的系统中非闲置线对之间的上行串扰影响数据, 以及本次线路初始化过程的第 一次下行串扰信道估计过程中确定的系统中非闲置线对之间的下行串扰影响数 据, 对系统中的非闲置线对进行分组, 不同组的线对之间的上行串扰影响数据 和下行串扰影响数据都小于设置的第一门限值。 另外, 可以增加分组的条件是, 组内线对之间的上行串扰影响数据和 /或下行串扰影响数据大于等于第一门限 值。 这样, 将相互间上行串扰不能忽略和 /或下行串扰不能忽略的线对分在一组。 这个分组结果可以应用在后续的上行串扰信道估计过程和下行串扰信道估计过 程中。
具体的, 在线路初始化过程中, 如果系统中不存在已上线线对, 则线路初 始化过程在上行(或下行) 方向上可以只进行一次串扰信道估计过程, 估计系 统中各新激活线对之间的串扰信道, 在进行完一次上行串扰信道估计过程和一 次下行串扰信道估计过程, 新激活线对都可以上线成为已上线线对。 在这种情 况下, 分组的过程可以在线路初始化过程结束后进行, 另外, 对于上述的线路 初始化过程系统中存在已上线线对的情况, 在线路初始化过程结束后也可以进 行分组, 此时分组的结果可以应用到线路上线阶段(两次线路初始化过程之间 的阶段, 在此阶段中可以进行多次串扰信道估计过程) 的后续的串扰信道估计 过程中。 确定的系统中已上线线对之间的上行串扰影响数据, 对系统中的已上线线对进 行分组, 不同组的线对之间的上行串扰影响数据小于设置的第一门限值; 也可 以根据线路初始化过程结束后进行的下行串扰信道估计过程中确定的系统中已 上线线对之间的下行串扰影响数据, 对系统中的已上线线对进行分组, 不同组 的线对之间的下行串扰影响数据小于设置的第一门限值。 因为, 新激活线对成 为已上线线对后, 各线对之间的串扰影响数据可能会发生变化, 所以这种方法 可以得到更加准确的分组。
另外, 也可以综合考虑上行串扰影响数据和下行串扰影响数据, 进行分组, 即根据线路初始化过程结束后进行的上行串扰信道估计过程中确定的系统中已 上线线对之间的上行串扰影响数据, 以及线路初始化过程结束后进行的下行串 扰信道估计过程中确定的系统中已上线线对之间的下行串扰影响数据, 对系统 中的已上线线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串扰
影响数据都小于设置的第一门限值。 另外, 可以增加分组的条件是, 组内线对 之间的上行串扰影响数据和 /或下行串扰影响数据大于等于第一门限值。 这样, 将相互间上行串扰不能忽略和 /或下行串扰不能忽略的线对分在一组。
当系统的非闲置线对中有异常线对 (如, 衰减值超出正常范围的线对、 多 次初始化不能上线的线对、 接触不良的线对等) 时, 分组的过程可以具体如下: 根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的非闲 置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限值; 将异常线对加入到平均值最大的组中。 两个线对之间的串扰影响数据包括第一 线对对第二线对的串扰影响数据, 以及第二线对对第一线对的串扰影响数据。
例如, 系统中有 5个非闲置线对 Ll、 L2、 L3、 L4、 L5, 其中 L5为异常线 对,那么,首先,对 Ll、 L2、 L3、 L4进行分组,假设分成 Gl、 G2两组, G1={ L1、 L2}、 G2={ L3、 L4} , 然后, 计算 L5与 Gl中各线对的串扰影响数据的平均值, 记作 WeightL5^Gl, WeightL5^Gl = ( weightL5→Ll + weightLl→L5 + weightL5→L2 + weight L1→L5 ) /4, weight →u L5对 L1的串扰影响数据, weightLl→L5 L1对 L5的串扰影响数据, weightL5→L2是 L5对 L2的串扰影响数据, weightL2→L5是 L2对 L5的串扰影响数据, 并按同样的方法计算 L5与 G2中各线对的串扰影响数据的平均值 ^ ti5^2 ,最 后, 比较 Weighty,和 Weight L^G1 , WW Weighty,较大, 则将 L5力口入到 G 1中, 得到的分组结果是 G1={ L1、 L2、 L5}、 G2={ L3、 L4}。
如果有多个异常的非闲置线对, 则在对不异常的非闲置线对分组后, 对每 个异常线对, 都按照上述的方式确定其所属的分组。
另外, 该异常情况下的分组过程也可以是: 根据之前的串扰信道估计过程 中确定的串扰影响数据, 对系统中非异常的非闲置线对进行分组, 不同组的线 对之间的串扰影响数据小于设置的第一门限值; 确定非异常的各非闲置线对对 所述异常线对的各串扰影响数据的平均值; 确定所述各串扰影响数据中大于所 述平均值的串扰影响数据对应的线对, 并将所述异常线对加入到该线对所属的 组中。
需要注意的是, 上述基于上行串扰影响数据进行的分组, 可以应用在后续 的上行串扰信道估计过程中, 基于下行串扰影响数据进行的分组, 可以应用在 后续的下行串扰信道估计过程中, 基于上行串扰影响数据和下行串扰影响数据 进行的分组, 可以应用在后续的上行串扰信道估计过程和行串扰信道估计过程
中。
本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。 实施例三
本发明实施例提供了一种串扰信道估计方法, 下面将结合线路初始化的过 程对本发明实施例提供的串扰信道估计方法进行进一步阐述, 该线路初始化过 程中系统存在已上线线对, 具体的处理流程可以参见图 2, 包括以下步骤:
步骤 201 , DSLAM接收终端发送的接入请求, 并与终端进行握手过程。 步骤 202, DSLAM估计系统中新激活线对对已上线线对的下行串扰信道 (对 应 O-P-VECTOR 1阶段 ),并估计系统中新激活线对对已上线线对的上行串扰信 道 (对应 R-P-VECTOR 1阶段)。
在这个步骤中可以不对非闲置线对进行分组, 导频序列的分配可以参见图 3 , 图中 L1-L6 是已上线线对, 在上一次线路初始化过程结束后进行过分组 G1={L1、 L2、 L3}、 G2={L4、 L5、 L6}, L7-L12为新激活线对, 之前已有的分 组对这次导频序列的分配并不会产生影响。 这里为 L1-L6分配了相同的导频序 列。
步骤 203, DSLAM根据串扰信道估计过程中确定的下行串扰影响数据和上 行串扰影响数据, 对系统中的非闲置线对进行分组。 其中, 不同组的线对之间 的上行串扰影响数据和下行串扰影响数据都小于设置的第一门限值, 且组内线 对之间的上行串扰影响数据和 /或下行串扰影响数据不小于该第一门限值。 这里 假设分组结果为: G1={U、 L2, L3 , 、 L8, L9} , G2={ L4, L5 , L6, L10, Ll l、 L12}。
步骤肌 在 R-P-VECTOR 1-1、 R-P-VECTOR 1-2、 O-P-VECTOR 1-1、 O-P-VECTOR 2阶段, DSLAM基于上述分组 , 估计各组组内的新激活线对对已 上线线对的上行或下行串扰信道。
具体的, 在上述每个阶段中, 首先, DSLAM可以先获取当前分组下各组中 线对的数目, 然后, DSLAM根据各组中线对的数目, 为各组分配导频序列, 最
后, DSLAM根据为各组分配的导频序列, 对各组的串扰信道进行估计。
步骤 205, 在 R-P- VECTOR 2和 0-P- VECTOR 2-1阶段, DSLAM基于上述 分组, 估计各组组内所有线对的上行和下行串扰信道。 具体过程如上, 不再进 行累述。
在上述步骤 204、 205的各阶段的串扰信道估计过程中, 导频序列的分配可 频序列, 图 4所示的分配方式中, 新激活线对没有使用步骤 202中的行索引, 图 5所示的分配方式中, 新激活线对使用步骤 202中的行索引。 图 4、 图 5中为 组内的已上线线对分配了相互正交的导频序列, 对于步骤 204 中的各阶段, 也 步骤 206, 新激活线对成为已上线线对, 线路初始化完成。 在此阶段可以进 行信道分析和数据交互等工作。
进一步的, 在步骤 206之后, DSLAM还可以对系统中所有已上线线对的串 扰信道进行估计, 根据串扰信道估计过程中得到的上行串扰影响数据和下行串 扰影响数据对已上线线对进行分组, 并根据新分组的结果, 进行线路上线阶段 (两次线路初始化过程之间的阶段, 在此阶段中可以进行多次串扰信道估计过 程) 的后续串扰信道估计。
根据最后得到的各组的上行和下行方向上的串扰信道, 可以进一步计算串 扰抵消系数, 根据串扰抵消系数可以对系统中已上线线对在后续数据传输过程 中接收和发送的信号进行处理, 以降低系统串扰。
本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。 实施例四
本发明实施例提供了一种串扰信道估计方法, 下面将结合线路初始化的过 程和后续的线路上线阶段对本发明实施例提供的串扰信道估计方法进行进一步 阐述, 该线路初始化过程中系统不存在已上线线对, 具体的处理流程可以参见 图 6, 包括以下步骤:
步骤 601 , DSLAM接收终端发送的接入请求, 并与终端进行握手过程。 步骤 602, 在 R-P- VECTOR 2和 0-P- VECTOR 2-1阶段, DSLAM估计所有 新激活线对之间的上行和下行串扰信道。 由于系统中不存在已上线线对, 可以 不进行 0-P- VECTOR 1、 R-P- VECTOR 1、 R-P- VECTOR 1-1、 R-P- VECTOR 1-2、 O-P-VECTOR 1-1、 0-P-VECTOR 2阶段。
步骤 603 , 新激活线对成为已上线线对, 线路初始化完成。 在此阶段可以进 行信道分析和数据交互等工作。
步骤 604, DSLAM对系统中所有已上线线对的上行和下行串扰信道进行估 计 , 根据串扰信道估计过程得到的上行串扰影响数据和下行串扰影响数据对已 上线线对进行分组。
步骤 605, DSLAM根据新分组的结果, 进行线路上线阶段(两次线路初始 化过程之间的阶段, 在此阶段中可以进行多次串扰信道估计过程) 的后续串扰 信道估计。
根据最后得到的各组的上行和下行方向上的串扰信道, 可以进一步计算串 扰抵消系数, 根据串扰抵消系数可以对系统中已上线线对在后续数据传输过程 中接收和发送的信号进行处理, 以降低系统串扰。
本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。 实施例五
基于相同的技术构思, 本发明实施例提供了一种服务器, 参见图 7, 该服务 器包括:
分组模块 710, 用于根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置 的第一门限值;
获取模块 720, 用于获取当前分组下各组中线对的数目;
分配模块 730, 用于根据各组中线对的数目, 为各组分配导频序列, 不同组 之间至少有一对不相互正交的导频序列;
估计模块 740, 用于使用为各组分配的导频序列, 对各组的串扰信道进行估 计。
优选的, 所述分配模块 730, 具体用于:
为各组分配导频序列时, 不同组之间至少有一对相同的导频序列。
优选的, 所述分配模块 730, 具体用于:
为各组分配导频序列时, 为每个组分配的所有导频序列, 都与分配导频序 列数目最多的组的各导频序列中的一个导频序列相同。
优选的, 所述估计模块 740, 具体用于对各组组内的新激活线对对已上线线 对的串扰信道进行估计;
所述分配模块 730, 具体用于:
对于包含新激活线对和已上线线对的组, 为已上线线对分配同一个导频序 列, 并为新激活线对分配数目为新激活线对数目的导频序列;
对于只包含新激活线对的组, 为新激活线对分配数目为新激活线对数目的 导频序列;
对于只包含已上线线对的组, 为已上线线对分配同一个导频序列。
优选的, 所述估计模块 740, 具体用于对各组组内的所有线对之间的串扰信 道进行估计;
所述分配模块 730, 具体用于: 为组内各线对分配数目为组内线对数目的导 频序列。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中 各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 所述分配模块 730, 具体用于:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的行索引;
对于组中线对的数目大于组中新激活线对的最大行索引的组, 以及不包含 新激活线对的组, 确定组中导频序列的长度大于或等于组中线对的数目;
对于组中线对的数目不大于组中新激活线对的最大行索引的组, 确定组中 导频序列的长度大于或等于组中新激活线对的最大行索引。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中 各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 所述分配模块 730, 具体用于:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的最大行索引;
如果线对数目最大的组的线对数目大于所述最大行索引, 则确定各组中导 频序列的长度相等, 且大于或等于该最大的线对数目;
如果线对数目最大的组的线对数目不大于所述最大行索引, 则确定各组中 导频序列的长度相等, 且大于或等于所述最大行索引。
优选的, 所述分配模块 730, 还用于:
如果确定出的导频序列长度的取值范围包含预设的第二门限值, 则将该导 频序列的长度设置为所述第二门限值;
如果确定出的导频序列长度的取值范围不包含预设的第二门限值, 则将该 导频序列的长度设置为该取值范围内最小的 2的自然数幂。
优选的, 所述分组模块 710, 具体用于:
在线路初始化过程中, 如果系统中存在已上线线对, 则在本次线路初始化 过程中的第一次上行串扰信道估计过程和第一次下行串扰信道估计过程都结束 时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确定的系统中 非闲置线对之间的上行串扰影响数据, 以及本次线路初始化过程的第一次下行 串扰信道估计过程中确定的系统中非闲置线对之间的下行串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值; 或者,
根据线路初始化过程结束后进行的上行串扰信道估计过程中确定的系统中 已上线线对之间的上行串扰影响数据, 以及线路初始化过程结束后进行的下行 串扰信道估计过程中确定的系统中已上线线对之间的下行串扰影响数据, 对系 统中的已上线线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值。
优选的, 当系统的非闲置线对中有异常线对时, 所述分组模块 710, 具体用 于:
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 值; 将所述异常线对加入到平均值最大的组中; 或者,
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的
非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 确定所述各串扰影响数据中大于所述平均值的串扰影响数据对应的线对, 并将 所述异常线对加入到该线对所属的组中。
本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。 实施例六
基于相同的技术构思, 本发明实施例提供了一种服务器, 参见图 8, 该服务 器包括处理器 810和存储器 820,处理器 810和存储器 820被配置为执行如下操 作:
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中的非闲置 线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限值; 获 取当前分组下各组中线对的数目; 根据各组中线对的数目, 为各组分配导频序 歹 ιΐ , 不同组之间至少有一对不相互正交的导频序列; 使用为各组分配的导频序 歹 ij , 对各组的串扰信道进行估计。
优选的, 所述不同组之间至少有一对不相互正交的导频序列, 具体为: 不同组之间至少有一对相同的导频序列。
优选的, 所述不同组之间至少有一对相同的导频序列, 具体为:
为每个组分配的所有导频序列, 都与分配导频序列数目最多的组的各导频 序列中的一个导频序列相同。
优选的, 所述对各组的串扰信道进行估计, 具体为对各组组内的新激活线 对对已上线线对的串扰信道进行估计;
所述根据各组中线对的数目, 为各组分配导频序列, 具体为:
对于包含新激活线对和已上线线对的组, 为已上线线对分配同一个导频序 列, 并为新激活线对分配数目为新激活线对数目的导频序列;
对于只包含新激活线对的组, 为新激活线对分配数目为新激活线对数目的 导频序列;
对于只包含已上线线对的组, 为已上线线对分配同一个导频序列。
优选的, 所述对各组的串扰信道进行估计, 具体为对各组组内的所有线对 之间的串扰信道进行估计;
所述根据各组中线对的数目, 为各组分配导频序列, 具体为: 为组内各线 对分配数目为组内线对数目的导频序列。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中 各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 根据各组中线对的数目, 为各组分配导频序 列时, 确定各组中导频序列的长度的方法包括:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的行索引;
对于组中线对的数目大于组中新激活线对的最大行索引的组, 以及不包含 新激活线对的组, 确定组中导频序列的长度大于或等于组中线对的数目;
对于组中线对的数目不大于组中新激活线对的最大行索引的组, 确定组中 导频序列的长度大于或等于组中新激活线对的最大行索引。
优选的, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中 各新激活线对分配的导频序列在 Walsh矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 根据各组中线对的数目, 为各组分配导频序 列时, 确定各组中导频序列的长度的方法包括:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的最大行索引;
如果线对数目最大的组的线对数目大于所述最大行索引, 则确定各组中导 频序列的长度相等, 且大于或等于该最大的线对数目;
如果线对数目最大的组的线对数目不大于所述最大行索引, 则确定各组中 导频序列的长度相等, 且大于或等于所述最大行索引。
优选的, 其特征在于, 还包括:
如果确定出的导频序列长度的取值范围包含预设的第二门限值, 则将该导 频序列的长度设置为所述第二门限值;
如果确定出的导频序列长度的取值范围不包含预设的第二门限值, 则将该 导频序列的长度设置为该取值范围内最小的 2的自然数幂。
优选的, 所述根据之前的串扰信道估计过程中确定的串扰影响数据, 对系
统中的非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第 一门限值, 具体为:
在线路初始化过程中, 如果系统中存在已上线线对, 则在本次线路初始化 过程中的第一次上行串扰信道估计过程和第一次下行串扰信道估计过程都结束 时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确定的系统中 非闲置线对之间的上行串扰影响数据, 以及本次线路初始化过程的第一次下行 串扰信道估计过程中确定的系统中非闲置线对之间的下行串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值; 或者,
根据线路初始化过程结束后进行的上行串扰信道估计过程中确定的系统中 已上线线对之间的上行串扰影响数据, 以及线路初始化过程结束后进行的下行 串扰信道估计过程中确定的系统中已上线线对之间的下行串扰影响数据, 对系 统中的已上线线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值。
优选的, 当系统的非闲置线对中有异常线对时, 所述根据之前的串扰信道 估计过程中确定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的 线对之间的串扰影响数据小于设置的第一门限值, 具体为:
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 值; 将所述异常线对加入到平均值最大的组中; 或者,
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 确定所述各串扰影响数据中大于所述平均值的串扰影响数据对应的线对, 并将 所述异常线对加入到该线对所属的组中。
本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。
实施例七
基于相同的技术构思, 本发明实施例提供了一种串扰信道估计系统, 参见 图 9, 包括终端 910和如上述实施例所述的服务器 920, 其中: 所述终端 910用于: 向所述服务器 920发送所述服务器 920预先通知的导频序 歹 ij ; 或者, 接收所述服务器 920发送的导频序列的误差样本, 并将所述误差样 本发送给所述服务器 920。
本发明实施例中, 将系统中的非闲置线对分为多个相互之间串扰可以忽略 的组, 因为组与组之间的串扰可以忽略, 所以各组都可以看做是一个独立的系 统, 在分配导频序列时, 不同组之间至少有一对不相互正交的导频序列, 降低 了相互正交的导频序列的数目, 从而在进行串扰信道估计时所需的导频序列长 度也可以缩短, 因此可以缩短串扰信道的估计过程所需要的时间。 需要说明的是: 上述实施例提供的串扰信道估计装置在对串扰信道进行估 计时, 仅以上述各功能模块的划分进行举例说明, 实际应用中, 可以根据需要 而将上述功能分配由不同的功能模块完成, 即将装置的内部结构划分成不同的 功能模块, 以完成以上描述的全部或者部分功能。 另外, 上述实施例提供的串 扰信道估计装置与串扰信道估计方法实施例属于同一构思, 其具体实现过程详 见方法实施例, 这里不再贅述。
上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过 硬件来完成, 也可以通过程序来指令相关的硬件完成, 所述的程序可以存储于 一种计算机可读存储介质中, 上述提到的存储介质可以是只读存储器, 磁盘或 光盘等。
以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的 精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的 保护范围之内。
Claims
1、 一种串扰信道估计方法, 其特征在于, 根据之前的串扰信道估计过程中 确定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的线对之间的 串扰影响数据小于设置的第一门限值, 所述方法包括:
获取当前分组下各组中线对的数目;
根据各组中线对的数目, 为各组分配导频序列, 不同组之间至少有一对不 相互正交的导频序列;
使用为各组分配的导频序列, 对各组的串扰信道进行估计。
2、 根据权利要求 1所述的方法, 其特征在于, 所述不同组之间至少有一对 不相互正交的导频序列, 具体为:
不同组之间至少有一对相同的导频序列。
3、 根据权利要求 2所述的方法, 其特征在于, 所述不同组之间至少有一对 相同的导频序列, 具体为:
为每个组分配的所有导频序列, 都与分配导频序列数目最多的组的各导频 序列中的一个导频序列相同。
4、 根据权利要求 1所述的方法, 其特征在于, 所述对各组的串扰信道进行 估计, 具体为对各组组内的新激活线对对已上线线对的串扰信道进行估计; 所述根据各组中线对的数目, 为各组分配导频序列, 具体为:
对于包含新激活线对和已上线线对的组, 为已上线线对分配同一个导频序 列, 并为新激活线对分配数目为新激活线对数目的导频序列;
对于只包含新激活线对的组, 为新激活线对分配数目为新激活线对数目的 导频序列;
对于只包含已上线线对的组, 为已上线线对分配同一个导频序列。
5、 根据权利要求 1所述的方法, 其特征在于, 所述对各组的串扰信道进行 估计, 具体为对各组组内的所有线对之间的串扰信道进行估计;
所述根据各组中线对的数目, 为各组分配导频序列, 具体为: 为组内各线 对分配数目为组内线对数目的导频序列。
6、 根据权利要求 1所述的方法, 其特征在于, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中各新激活线对分配的导频序列在 Walsh矩 阵中的行索引保持不变;
在上行串扰信道估计过程中, 根据各组中线对的数目, 为各组分配导频序 列时, 确定各组中导频序列的长度的方法包括:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的行索引;
对于组中线对的数目大于组中新激活线对的最大行索引的组, 以及不包含 新激活线对的组, 确定组中导频序列的长度大于或等于组中线对的数目;
对于组中线对的数目不大于组中新激活线对的最大行索引的组, 确定组中 导频序列的长度大于或等于组中新激活线对的最大行索引。
7、 根据权利要求 1所述的方法, 其特征在于, 在一次线路初始化过程中, 每次上行串扰信道估计过程为系统中各新激活线对分配的导频序列在 Walsh矩 阵中的行索引保持不变;
在上行串扰信道估计过程中, 根据各组中线对的数目, 为各组分配导频序 列时, 确定各组中导频序列的长度的方法包括:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的最大行索引;
如果线对数目最大的组的线对数目大于所述最大行索引, 则确定各组中导 频序列的长度相等, 且大于或等于该最大的线对数目;
如果线对数目最大的组的线对数目不大于所述最大行索引, 则确定各组中 导频序列的长度相等, 且大于或等于所述最大行索引。
8、 根据权利要求 6或 7所述的方法, 其特征在于, 还包括:
如果确定出的导频序列长度的取值范围包含预设的第二门限值, 则将该导 频序列的长度设置为所述第二门限值;
如果确定出的导频序列长度的取值范围不包含预设的第二门限值, 则将该 导频序列的长度设置为该取值范围内最小的 2的自然数幂。
9、 根据权利要求 1所述的方法, 其特征在于, 所述根据之前的串扰信道估 计过程中确定的串扰影响数据, 对系统中的非闲置线对进行分组, 不同组的线 对之间的串扰影响数据小于设置的第一门限值, 具体为:
在线路初始化过程中, 如果系统中存在已上线线对, 则在本次线路初始化 过程中的第一次上行串扰信道估计过程和第一次下行串扰信道估计过程都结束 时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确定的系统中 非闲置线对之间的上行串扰影响数据, 以及本次线路初始化过程的第一次下行
串扰信道估计过程中确定的系统中非闲置线对之间的下行串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值; 或者,
根据线路初始化过程结束后进行的上行串扰信道估计过程中确定的系统中 已上线线对之间的上行串扰影响数据, 以及线路初始化过程结束后进行的下行 串扰信道估计过程中确定的系统中已上线线对之间的下行串扰影响数据, 对系 统中的已上线线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值。
10、 根据权利要求 1 所述的方法, 其特征在于, 当系统的非闲置线对中有 异常线对时, 所述根据之前的串扰信道估计过程中确定的串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第 一门限值, 具体为:
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 值; 将所述异常线对加入到平均值最大的组中; 或者,
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 确定所述各串扰影响数据中大于所述平均值的串扰影响数据对应的线对, 并将 所述异常线对加入到该线对所属的组中。
11、 一种服务器, 其特征在于, 所述服务器包括:
分组模块, 用于根据之前的串扰信道估计过程中确定的串扰影响数据, 对 系统中的非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的 第一门限值;
获取模块, 用于获取当前分组下各组中线对的数目;
分配模块, 用于根据各组中线对的数目, 为各组分配导频序列, 不同组之 间至少有一对不相互正交的导频序列;
估计模块, 用于使用为各组分配的导频序列, 对各组的串扰信道进行估计。
12、 根据权利要求 11所述的服务器, 其特征在于, 所述分配模块, 具体用
于:
为各组分配导频序列时, 不同组之间至少有一对相同的导频序列。
13、 根据权利要求 12所述的服务器, 其特征在于, 所述分配模块, 具体用 于:
为各组分配导频序列时, 为每个组分配的所有导频序列, 都与分配导频序 列数目最多的组的各导频序列中的一个导频序列相同。
14、 根据权利要求 11所述的服务器, 其特征在于, 所述估计模块, 具体用 于对各组组内的新激活线对对已上线线对的串扰信道进行估计;
所述分配模块, 具体用于:
对于包含新激活线对和已上线线对的组, 为已上线线对分配同一个导频序 列, 并为新激活线对分配数目为新激活线对数目的导频序列;
对于只包含新激活线对的组, 为新激活线对分配数目为新激活线对数目的 导频序列;
对于只包含已上线线对的组, 为已上线线对分配同一个导频序列。
15、 根据权利要求 11所述的服务器, 其特征在于, 所述估计模块, 具体用 于对各组组内的所有线对之间的串扰信道进行估计; 序列。
16、 根据权利要求 11所述的服务器, 其特征在于, 在一次线路初始化过程 中,每次上行串扰信道估计过程为系统中各新激活线对分配的导频序列在 Walsh 矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 所述分配模块, 具体用于:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的行索引;
对于组中线对的数目大于组中新激活线对的最大行索引的组, 以及不包含 新激活线对的组, 确定组中导频序列的长度大于或等于组中线对的数目;
对于组中线对的数目不大于组中新激活线对的最大行索引的组, 确定组中 导频序列的长度大于或等于组中新激活线对的最大行索引。
17、 根据权利要求 11所述的服务器, 其特征在于, 在一次线路初始化过程 中,每次上行串扰信道估计过程为系统中各新激活线对分配的导频序列在 Walsh 矩阵中的行索引保持不变;
在上行串扰信道估计过程中, 所述分配模块, 具体用于:
获取本次线路初始化过程的第一次上行串扰信道估计过程中为系统中各新 激活线对分配的导频序列在 Walsh矩阵中的最大行索引;
如果线对数目最大的组的线对数目大于所述最大行索引, 则确定各组中导 频序列的长度相等, 且大于或等于该最大的线对数目;
如果线对数目最大的组的线对数目不大于所述最大行索引, 则确定各组中 导频序列的长度相等, 且大于或等于所述最大行索引。
18、 根据权利要求 16或 17所述的服务器, 其特征在于, 所述分配模块, 还用于:
如果确定出的导频序列长度的取值范围包含预设的第二门限值, 则将该导 频序列的长度设置为所述第二门限值;
如果确定出的导频序列长度的取值范围不包含预设的第二门限值, 则将该 导频序列的长度设置为该取值范围内最小的 2的自然数幂。
19、 根据权利要求 11所述的服务器, 其特征在于, 所述分组模块, 具体用 于:
在线路初始化过程中, 如果系统中存在已上线线对, 则在本次线路初始化 过程中的第一次上行串扰信道估计过程和第一次下行串扰信道估计过程都结束 时, 根据本次线路初始化过程的第一次上行串扰信道估计过程中确定的系统中 非闲置线对之间的上行串扰影响数据, 以及本次线路初始化过程的第一次下行 串扰信道估计过程中确定的系统中非闲置线对之间的下行串扰影响数据, 对系 统中的非闲置线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值; 或者,
根据线路初始化过程结束后进行的上行串扰信道估计过程中确定的系统中 已上线线对之间的上行串扰影响数据, 以及线路初始化过程结束后进行的下行 串扰信道估计过程中确定的系统中已上线线对之间的下行串扰影响数据, 对系 统中的已上线线对进行分组, 不同组的线对之间的上行串扰影响数据和下行串 扰影响数据都小于设置的第一门限值。
20、 根据权利要求 11所述的服务器, 其特征在于, 当系统的非闲置线对中 有异常线对时, 所述分组模块, 具体用于:
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限
值; 对于每个组, 确定所述异常线对与组中各线.
值; 将所述异常线对加入到平均值最大的组中; 或者,
根据之前的串扰信道估计过程中确定的串扰影响数据, 对系统中非异常的 非闲置线对进行分组, 不同组的线对之间的串扰影响数据小于设置的第一门限 确定所述各串扰影响数据中大于所述平均值的串扰影响数据对应的线对, 并将 所述异常线对加入到该线对所属的组中。
21、 一种串扰信道估计系统, 其特征在于, 包括终端和如权利要求 11-20 所述的服务器, 其中: 所述终端用于: 向所述服务器发送所述服务器预先通知的导频序列; 或者, 接 收所述服务器发送的导频序列的误差样本, 并将所述误差样本发送给所述服务 器。
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CN114205194A (zh) * | 2021-12-10 | 2022-03-18 | 哈尔滨工程大学 | 水下mimo-ofdm系统非正交导频图案设计方法 |
CN114205194B (zh) * | 2021-12-10 | 2023-09-29 | 哈尔滨工程大学 | 水下mimo-ofdm系统非正交导频图案设计方法 |
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