CN107852385B - Line rate improving method and device - Google Patents

Line rate improving method and device Download PDF

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CN107852385B
CN107852385B CN201580081495.8A CN201580081495A CN107852385B CN 107852385 B CN107852385 B CN 107852385B CN 201580081495 A CN201580081495 A CN 201580081495A CN 107852385 B CN107852385 B CN 107852385B
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CN107852385A (en
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殷慧
孙方林
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Shanghai Pengbang Industrial Co ltd
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Huawei Technologies Co Ltd
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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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

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Abstract

The embodiment of the invention provides a method for improving the line speed, which comprises the steps of obtaining a precoding coefficient P (I) at a sending end; wherein H‑1An inverse matrix representing a channel transmission matrix H on M twisted pairs, (II) a diagonal matrix taking a direct channel in the channel transmission matrix H as a main diagonal element; pre-coding the signals to be transmitted on the M twisted pairs by using the pre-coding coefficient P; sending out the pre-coded signal to be sent; the embodiment of the invention also provides a device for improving the line speed.

Description

Line rate improving method and device
Technical Field
The invention relates to the field of data communication, in particular to a method and a device for improving line speed.
Background
Digital Subscriber Line (DSL) is a high-speed data transmission technology for transmission over telephone twisted Pair wires, such as Unshielded Twisted Pair (UTP). A DSL system has multiple DSL lines, and at present, multiple DSL accesses are usually provided by a DSL access multiplexer (DSLAM) for multiple Customer Premises Equipments (CPEs). However, due to the principle of electromagnetic induction, Crosstalk (Crosstalk) is generated between multiple signals accessing the DSLAM. As shown in fig. 1. Twisted pair lines have strong Far-end Crosstalk (FEXT) at high frequencies, and in order to cancel Crosstalk-induced noise, for example, Vectored DSL techniques may be used to cancel Far-end Crosstalk on multiple DSL lines. Without the use of Vector technology, most lines can only reach 20-30% of the rate at which a single line is active (i.e., the rate without crosstalk). However, if Vector technology is used, relatively high rates can be achieved on the line, but at best only about 95% of the rate without crosstalk can be achieved.
Disclosure of Invention
The embodiment of the invention provides a method and a device for improving the speed of a line, which are used for increasing the speed of the line.
In a first aspect, an embodiment of the present invention provides a method for increasing a line rate, including:
at the transmitting end, a precoding coefficient P is obtained, the
Figure GPA0000237374850000031
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure GPA0000237374850000032
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000041
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure GPA0000237374850000049
Is a direct channel h with line kkkIs in phase difference of
Figure GPA0000237374850000042
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
pre-coding the signals to be transmitted on the M twisted pairs by using the pre-coding coefficient P;
and sending out the pre-coded signal to be sent.
In a first possible implementation manner of the first aspect, the channel transmission matrix H on the M twisted pairs is represented as
Figure GPA0000237374850000043
Wherein the content of the first and second substances,diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure GPA0000237374850000044
can be expressed as
Figure GPA0000237374850000045
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure GPA0000237374850000046
In combination with the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the Δ HkIs obtained by the following method:
in the set of direct channels of line k and crosstalk channels of other lines of the M lines to line k, i.e. HkIn the method, a direct channel h with the line k is searchedkkIs in phase difference of
Figure GPA0000237374850000047
Cross talk channel h betweenkiThe result is a set S of,
Figure GPA0000237374850000048
wherein angle (h)ki，hkk) Representing a cross-talk channel hkiAnd hkkPhase difference; arranging the S elements from large to small according to the amplitude value to obtain a set
Figure GPA0000237374850000051
Figure GPA0000237374850000052
Wherein
Figure GPA0000237374850000053
To represent
Figure GPA0000237374850000054
The magnitude of (d); then through said
Figure GPA0000237374850000055
Obtaining Δ Hk。
With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner, the method further includes,
obtaining updated precoding coefficients P', said
Figure GPA0000237374850000056
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000057
Opening and closing
Figure GPA0000237374850000058
Is a direct channel h with line gggIs in phase difference of
Figure GPA0000237374850000059
Cross talk channel h betweengiAnd arranging the elements of the formed set from large to small according to the amplitude values.
Pre-coding the signals to be transmitted on the M twisted pairs by using the P'; and sending out the pre-coded signal to be sent.
In a second aspect, an embodiment of the present invention provides an apparatus for increasing a line speed, including: a precoding coefficient acquisition unit 31, a precoder 32, and a transmitter 33;
the precoding coefficient obtaining unit 31 is configured to obtain a precoding coefficient P, which is
Figure GPA00002373748500000510
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure GPA00002373748500000511
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure GPA00002373748500000512
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure GPA00002373748500000513
Is a direct channel h with line kkkIs in phase difference of
Figure GPA00002373748500000514
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
the precoder 32 is configured to precode signals to be transmitted on the M twisted pairs by using the precoding coefficient P;
the transmitter 33 is configured to send out a signal to be sent after precoding.
In a first possible implementation manner of the second aspect, the channel transmission matrix H on the M twisted pairs is represented as
Figure GPA0000237374850000061
Wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure GPA0000237374850000062
can be expressed as
Figure GPA0000237374850000063
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure GPA0000237374850000064
With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the precoding coefficient obtaining unit 31 is further configured to obtain Δ HkThe method specifically comprises the following steps:
in the set of direct channels of line k and crosstalk channels of other lines of the M lines to line k, i.e. HkIn the method, a direct channel h with the line k is searchedkkIs in phase difference of
Figure GPA0000237374850000065
Cross talk channel h betweenkiThe result is a set S of,
Figure GPA0000237374850000066
wherein angle (h)ki，hkk) Representing a cross-talk channel hkiAnd hkkPhase difference; arranging the S elements from large to small according to the amplitude value to obtain a set
Figure GPA0000237374850000067
Figure GPA0000237374850000068
Wherein
Figure GPA0000237374850000069
To represent
Figure GPA00002373748500000610
The magnitude of (d); then through said
Figure GPA00002373748500000611
Obtaining Δ Hk。
With reference to the second aspect, the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, in a third possible implementation manner, the precoding coefficient obtaining unit 31 obtains the updated precoding coefficient P 'and then sends the updated precoding coefficient P' to the precoder,the above-mentioned
Figure GPA0000237374850000071
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000072
And is
Figure GPA0000237374850000073
Is a direct channel h with line gggIs in phase difference of
Figure GPA0000237374850000074
Cross talk channel h betweengiAnd arranging the elements of the formed set from large to small according to the amplitude values.
And the precoder utilizes the P' to precode signals to be transmitted on the M twisted pairs.
In a third aspect, an embodiment of the present invention provides an apparatus for increasing a line rate, where the apparatus includes: a receiver 41, a processor 42 and a transmitter 43.
A receiver 41, configured to obtain a channel transmission matrix H on M twisted pairs; specifically, H is represented by
Figure GPA0000237374850000075
A processor 42 for calculating a precoding coefficient P, said
Figure GPA0000237374850000076
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure GPA0000237374850000077
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000078
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure GPA0000237374850000079
Is a direct channel h with line kkkIs in phase difference of
Figure GPA00002373748500000710
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values; pre-coding the signals to be transmitted on the M twisted pairs by using the pre-coding coefficient P;
and a transmitter 43, configured to send out the pre-coded signal to be sent.
In a first possible implementation manner of the third aspect, the channel transmission matrix H on the M twisted pairs is represented as
Figure GPA0000237374850000081
Wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure GPA0000237374850000082
can be expressed as
Figure GPA0000237374850000083
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure GPA0000237374850000084
By adopting the scheme described in this embodiment, the specific precoding coefficient is utilized to precode the signal to be transmitted on the line, so that each line can increase a part of the transmission power while transmitting the signal on its own line at a certain power, and the speed of a certain line or a plurality of lines can be increased while suppressing the noise caused by crosstalk.
Drawings
Figure 1 is a schematic diagram of a network for multiple DSL access;
FIG. 2 is a schematic flow chart of a method according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to eliminate crosstalk on a line, pre-compensation and the like can be performed on a transmission signal at a network side (CO side) according to crosstalk parameters fed back by a user side (namely, a CPE side), and the technique is called Vectoring (Vectoring); the vectorization processing device is a Vectorization Control Entity (VCE) in the DSLAM. The existing vectored dsl technology mainly utilizes the characteristic of joint transceiving at the DSLAM end, and uses a signal processing method to cancel FEXT interference. Finally, FEXT interference in each path of signal is eliminated. Corresponding to fig. 1, the shared channel between DSLAM and CPE downstream and upstream is denoted H, which is one of the subcarriers (tones) f in the frequency domain0Above can be expressed in matrix form:
Figure GPA0000237374850000091
wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting the crosstalk channel of line j to line i. By Hi＝[hi1hi2… hiM]Representing the set of direct channels of line i and crosstalk channels of other lines to line i, it can be seen that HiThat is to say, the ith row of the H matrix.
Where the number of lines is set to M, then H is an M x M channel transmission matrix. Let x be an mx 1 channel input vector, y be an mx 1 channel output vector, and n be an mx 1 noise vector, respectively. Finally, the channel transmission equation is expressed in the form:
y＝Hx+n
in the downlink signal transmission process, joint transmission processing of signals is performed at a CO end, a precoder is introduced at the CO end, and a coding coefficient of the precoder is denoted as P, so that the transmitted signals are:
Figure GPA0000237374850000092
the signals received by the receiving end are:
Figure GPA0000237374850000093
when HP is a diagonal matrix
Figure GPA0000237374850000101
The crosstalk noise will be cancelled, at which time
Figure GPA0000237374850000102
Wherein H-1Representing the inverse of the channel transmission matrix H.
On the basis of the Vectoring technology, the embodiment of the invention further adjusts the coefficient P of the precoder, inhibits the noise caused by crosstalk, and increases the transmission power on part of lines to achieve the rate increase on one or more lines.
In the following, in subcarrier f0Increasing the rate of line k is an example to illustrate how the precoder coefficients P are adjusted.
First, at HkIn search of direct channel h with line kkkIs in phase difference of
Figure GPA0000237374850000103
Cross talk channel h betweenkiForming a set S:
Figure GPA0000237374850000104
wherein angle (h)ki，hkk) Representing a cross-talk channel hkiAnd hkkA phase difference.
Arranging the S elements from large to small according to the amplitude value to obtain a set
Figure GPA0000237374850000105
Figure GPA0000237374850000106
Wherein
Figure GPA0000237374850000107
To represent
Figure GPA0000237374850000108
Of the amplitude of (c).
Suppose at subcarrier f0In the above, the transmission power of the N lines needs to be adjusted to speed up the line k, where N is greater than or equal to 1 and less than or equal to M; destination channel of line k
Figure GPA0000237374850000109
For the direct channel hkkAnd channel increment Δ hkkIs a sum of
Figure GPA00002373748500001010
The increment of the target channel relative to the direct channel is as follows:
Figure GPA00002373748500001011
then the target channel of line k
Figure GPA00002373748500001012
Can also be expressed as
Figure GPA00002373748500001013
Assuming we only need to speed up line k, the target channels on the remaining M-1 lines other than line k should be equal to the direct channels, i.e. the channel increment is 0, noted as
Figure GPA00002373748500001014
And i ≠ k. Target channel matrix mark finally formed
Figure GPA00002373748500001015
Comprises the following steps:
Figure GPA0000237374850000111
wherein
Figure GPA0000237374850000112
Namely a diagonal matrix with a direct channel as a main diagonal element;
Figure GPA0000237374850000113
i.e. Δ h except the kth main diagonal elementkkBesides, the other elements are all 0 matrixes.
The coefficient P of the precoder is
Figure GPA0000237374850000114
Further, if there is a need to speed up other lines, such as line i, then that is required
Figure GPA0000237374850000115
According to the embodiment of the invention, on any time slice and frequency spectrum segment, the signals to be transmitted on the lines are precoded by utilizing the specific precoding coefficient, so that each line can increase a part of transmission power while transmitting the signals on the line per se at a certain power, and the speed of a certain line or a plurality of lines is increased while the noise caused by crosstalk is inhibited.
Correspondingly, an embodiment of the present invention provides a method for increasing a line rate, as shown in fig. 2, where the method includes:
step 201, at the transmitting end, obtaining a precoding coefficient P, the step
Figure GPA0000237374850000116
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure GPA0000237374850000117
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000118
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure GPA0000237374850000119
Is a direct channel h with line kkkIs in phase difference of
Figure GPA00002373748500001110
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
step 203, utilizing the precoding coefficient P to precode signals to be transmitted on the M twisted-pair cables;
and step 205, sending out the pre-coded signal to be sent.
This may achieve an increase in the line rate of line k.
Further, the channel transmission matrix H on the M twisted pairs is represented as
Figure GPA0000237374850000121
Wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure GPA0000237374850000122
can be expressed as
Figure GPA0000237374850000123
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure GPA0000237374850000124
Further, the Δ HkIs obtained by the following method:
in the set of direct channels of line k and crosstalk channels of other lines of the M lines to line k, i.e. HkIn the method, a direct channel h with the line k is searchedkkIs in phase difference of
Figure GPA0000237374850000125
Cross talk channel h betweenkiThe result is a set S of,
Figure GPA0000237374850000126
wherein angle (h)ki，hkk) Representing a cross-talk channel hkiAnd hkkPhase difference; arranging the S elements from large to small according to the amplitude value to obtain a set
Figure GPA0000237374850000127
Figure GPA0000237374850000128
Wherein
Figure GPA0000237374850000129
To represent
Figure GPA00002373748500001210
The magnitude of (d); then through said
Figure GPA00002373748500001211
Obtaining Δ Hk。
Note that, h is a numberkiAnd hkkBoth are complex numbers, so that there is a phase difference between them.
Further, after step 205, updated precoding coefficients P' are obtained
Figure GPA0000237374850000131
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000132
And is
Figure GPA0000237374850000133
Is a direct channel h with line gggIs in phase difference of
Figure GPA0000237374850000134
Cross talk channel h betweengiAnd arranging the elements of the formed set from large to small according to the amplitude values.
And precoding the signals to be transmitted on the M twisted pairs by utilizing the P'. Of course, the signal to be transmitted is data to be transmitted at the transmitting end after the time point at which the coefficient P' is obtained. And then, sending out the pre-coded signal to be sent.
This can achieve an increase in the line rate for line k and line g.
Similarly, if the line rate of other lines i or more needs to be increased, the precoding coefficient P is updated to the above manner
Figure GPA0000237374850000135
And precoding the signal to be transmitted by using the updated precoding coefficient PThis can be achieved.
According to the embodiment of the invention, the specific precoding coefficient is utilized to precode the signals to be transmitted on the lines, so that part of the transmission power can be increased on the premise that each line transmits the signals on the line at a certain power, and the speed of one line or a plurality of lines can be increased while the noise caused by crosstalk is inhibited. In this embodiment, all the lines in the M lines may be accelerated, or a part of the lines may be optimized to accelerate as required. In addition, although the present embodiment is described with respect to a single subcarrier, the line may be accelerated in the above manner on each of a plurality of subcarriers, respectively.
The embodiment of the present invention further provides a device 30 for increasing a line rate, as shown in fig. 3, including a precoding coefficient obtaining unit 31, a precoder 32 and a transmitter 33;
the precoding coefficient obtaining unit 31 is configured to obtain a precoding coefficient P, which is
Figure GPA0000237374850000136
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure GPA0000237374850000137
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000141
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure GPA0000237374850000142
Is a direct channel h with line kkkIs in phase difference of
Figure GPA0000237374850000143
Cross talk channel h betweenkiAccording toThe amplitude values are arranged from large to small to form elements of a set;
the pre-coder 32 pre-codes the signals to be transmitted on the M twisted pairs by using the pre-coding coefficient P;
the transmitter 33 transmits the pre-coded signal to be transmitted.
Further, the channel transmission matrix H on the M twisted pairs is represented as
Figure GPA0000237374850000144
Wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure GPA0000237374850000145
can be expressed as
Figure GPA0000237374850000146
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure GPA0000237374850000147
Further, the Δ HkThe precoding coefficient acquisition unit 31 is obtained by:
in the set of direct channels of line k and crosstalk channels of other lines of the M lines to line k, i.e. HkIn the method, a direct channel h with the line k is searchedkkIs in phase difference of
Figure GPA0000237374850000148
Cross talk channel h betweenkiThe result is a set S of,
Figure GPA0000237374850000151
wherein angle (h)ki，hkk) Representing a cross-talk channel hkiAnd hkkPhase difference; elements of S are as followsThe amplitude values are arranged from large to small to obtain a set
Figure GPA0000237374850000152
Figure GPA0000237374850000153
Wherein
Figure GPA0000237374850000154
To represent
Figure GPA0000237374850000155
The magnitude of (d); then through said
Figure GPA0000237374850000156
Obtaining Δ Hk。
Further, the precoding coefficient obtaining unit 31 obtains the updated precoding coefficient P ', and then sends the updated precoding coefficient P ' to the precoder 32, where the updated precoding coefficient P ' is obtained
Figure GPA0000237374850000157
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000158
And is
Figure GPA0000237374850000159
Is a direct channel h with line gggIs in phase difference of
Figure GPA00002373748500001510
Cross talk channel h betweengiAnd arranging the elements of the formed set from large to small according to the amplitude values.
The precoder 32 precodes signals to be transmitted on the M twisted pairs by using the P'; of course, the signal to be transmitted is data to be transmitted at the transmitting end after the time point when the precoding coefficient obtaining unit 31 obtains the coefficient P'. Then, the transmitter 33 transmits the pre-coded signal to be transmitted
This can achieve an increase in the line rate for line k and line g.
According to the embodiment of the invention, the specific precoding coefficient is utilized to precode the signals to be transmitted on the lines, so that part of the transmission power can be increased on the premise that each line transmits the signals on the line at a certain power, and the speed of one line or a plurality of lines can be increased while the noise caused by crosstalk is inhibited.
It should be further explained that the specific actions performed by the precoding coefficient obtaining unit and the precoder in the network side device are the methods in the above method embodiments.
Another apparatus 40 for increasing line rate is further provided in the embodiments of the present invention, as shown in fig. 4, where the apparatus 40 includes: a receiver 41, a processor 42 and a transmitter 43.
A receiver 41, configured to obtain a channel transmission matrix H on M twisted pairs; specifically, H is represented by
Figure GPA0000237374850000161
A processor 42 for calculating a precoding coefficient P, said
Figure GPA0000237374850000162
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure GPA0000237374850000163
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure GPA0000237374850000164
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure GPA0000237374850000165
Is a direct channel h with line kkkIs in phase difference of
Figure GPA0000237374850000166
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values; pre-coding the signals to be transmitted on the M twisted pairs by using the pre-coding coefficient P;
and a transmitter 43, configured to send out the pre-coded signal to be sent.
In the above embodiments, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks. In particular, the network processing described above may be implemented on a general-purpose component such as a computer or network component having sufficient processing power, memory resources, and network throughput capability.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (13)

1. A method for increasing line speed, comprising:
at the transmitting end, a precoding coefficient P is obtained, the
Figure FDA0002365395450000011
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure FDA0002365395450000012
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure FDA0002365395450000013
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure FDA0002365395450000014
Is a direct channel h with line kkkIs in phase difference of
Figure FDA0002365395450000015
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
pre-coding the signals to be transmitted on the M twisted pairs by using the pre-coding coefficient P;
and sending out the pre-coded signal to be sent.
2. The method of claim 1, wherein the method comprisesThe channel transmission matrix H on the M twisted pairs is represented as
Figure FDA0002365395450000016
Wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure FDA0002365395450000017
can be expressed as
Figure FDA0002365395450000018
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure FDA0002365395450000019
3. The method of claim 1 or 2, wherein Δ HkIs obtained by the following method:
in the set of direct channels of line k and crosstalk channels of other lines of the M lines to line k, i.e. HkIn the method, a direct channel h with the line k is searchedkkIs in phase difference of
Figure FDA00023653954500000110
Cross talk channel h betweenkiThe result is a set S of,
Figure FDA00023653954500000111
wherein angle (h)ki,hkk) Representing a cross-talk channel hkiAnd hkkPhase difference; arranging the S elements from large to small according to the amplitude value to obtain a set
Figure FDA0002365395450000021
Figure FDA0002365395450000022
Wherein
Figure FDA0002365395450000023
To represent
Figure FDA0002365395450000024
The magnitude of (d); then through said
Figure FDA0002365395450000025
Obtaining Δ Hk。
4. The method of any of claims 1 to 2, further comprising,
obtaining updated precoding coefficients P', said
Figure FDA0002365395450000026
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure FDA0002365395450000027
And is
Figure FDA0002365395450000028
Is a direct channel h with line gggIs in phase difference of
Figure FDA0002365395450000029
Cross talk channel h betweengiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
pre-coding the signals to be transmitted on the M twisted pairs by using the P'; and sending out the pre-coded signal to be sent.
5. The method of claim 3, further comprising,
obtaining updated predictionsEncoding coefficient P', said
Figure FDA00023653954500000210
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure FDA00023653954500000211
And is
Figure FDA00023653954500000212
Is a direct channel h with line gggIs in phase difference of
Figure FDA00023653954500000213
Cross talk channel h betweengiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
pre-coding the signals to be transmitted on the M twisted pairs by using the P'; and sending out the pre-coded signal to be sent.
6. A line rate boosting apparatus, comprising: a precoding coefficient acquisition unit 31, a precoder 32, and a transmitter 33;
the precoding coefficient obtaining unit 31 is configured to obtain a precoding coefficient P, which is
Figure FDA00023653954500000214
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure FDA00023653954500000215
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure FDA00023653954500000216
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure FDA00023653954500000217
Is a direct channel h with line kkkIs in phase difference of
Figure FDA00023653954500000218
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
the precoder 32 is configured to precode signals to be transmitted on the M twisted pairs by using the precoding coefficient P;
the transmitter 33 is configured to send out a signal to be sent after precoding.
7. The apparatus of claim 6, wherein the channel transmission matrix H over the M twisted pairs is represented as
Figure FDA0002365395450000031
Wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure FDA0002365395450000032
can be expressed as
Figure FDA0002365395450000033
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure FDA0002365395450000034
8. The apparatus according to claim 6 or 7, wherein the precoding coefficient obtaining unit 31 is further configured to obtain the precoding coefficientFor obtaining Δ HkThe method specifically comprises the following steps:
in the set of direct channels of line k and crosstalk channels of other lines of the M lines to line k, i.e. HkIn the method, a direct channel h with the line k is searchedkkIs in phase difference of
Figure FDA0002365395450000035
Cross talk channel h betweenkiThe result is a set S of,
Figure FDA0002365395450000036
wherein angle (h)ki,hkk) Representing a cross-talk channel hkiAnd hkkPhase difference; arranging the S elements from large to small according to the amplitude value to obtain a set
Figure FDA0002365395450000037
Figure FDA0002365395450000038
Wherein
Figure FDA0002365395450000039
To represent
Figure FDA00023653954500000310
The magnitude of (d); then through said
Figure FDA00023653954500000311
Obtaining Δ Hk。
9. The apparatus according to any of claims 6 to 7, wherein the precoding coefficient obtaining unit 31 obtains the updated precoding coefficient P 'and sends the updated precoding coefficient P' to the precoder
Figure FDA00023653954500000312
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure FDA00023653954500000313
And is
Figure FDA00023653954500000314
Is a direct channel h with line gggIs in phase difference of
Figure FDA0002365395450000041
Cross talk channel h betweengiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
and the precoder utilizes the P' to precode signals to be transmitted on the M twisted pairs.
10. The apparatus of claim 8, wherein the precoding coefficient obtaining unit 31 obtains the updated precoding coefficient P 'and sends the updated precoding coefficient P' to a precoder
Figure FDA0002365395450000042
Wherein Δ HgIs divided by the g-th main diagonal element by Δ hggBesides, the other elements are all 0 matrixes, the
Figure FDA0002365395450000043
And is
Figure FDA0002365395450000044
Is a direct channel h with line gggIs in phase difference of
Figure FDA0002365395450000045
Cross talk channel h betweengiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values;
and the precoder utilizes the P' to precode signals to be transmitted on the M twisted pairs.
11. A line rate boosting apparatus, comprising: a receiver 41, a processor 42 and a transmitter 43;
a receiver 41, configured to obtain a channel transmission matrix H on M twisted pairs; specifically, H is represented by
Figure FDA0002365395450000046
A processor 42 for calculating a precoding coefficient P, said
Figure FDA0002365395450000047
Wherein H-1An inverse matrix representing the channel transmission matrix H over the M twisted pairs,
Figure FDA0002365395450000048
a diagonal matrix using a direct channel in the channel transmission matrix H as a main diagonal element; Δ HkIs divided by the kth main diagonal element by Δ hkkBesides, the other elements are all 0 matrixes, the
Figure FDA0002365395450000049
Wherein N represents the number of lines requiring adjustment of transmission power, and N is more than or equal to 1 and less than or equal to M; and is
Figure FDA00023653954500000410
Is a direct channel h with line kkkIs in phase difference of
Figure FDA00023653954500000411
Cross talk channel h betweenkiArranging elements of a set formed after the elements are arranged from large to small according to amplitude values; pre-coding the signals to be transmitted on the M twisted pairs by using the pre-coding coefficient P;
and a transmitter 43, configured to send out the pre-coded signal to be sent.
12. The apparatus of claim 11, wherein the channel transmission matrix H over the M twisted pairs is represented as
Figure FDA0002365395450000051
Wherein, diagonal element hiiDirect channel, off diagonal element h representing line iijRepresenting a crosstalk channel of a line j to a line i, wherein i is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to M, and i is not equal to j;
Figure FDA0002365395450000052
can be expressed as
Figure FDA0002365395450000053
Wherein h isMMA direct channel representing line M; Δ HkCan be expressed as
Figure FDA0002365395450000054
13. A computer-readable storage medium, storing a computer program, wherein the computer program, when executed by hardware, is capable of implementing the method of any one of claims 1 to 5.
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