CN101686067B - Method, device and system for enhancing line stability - Google Patents

Method, device and system for enhancing line stability Download PDF

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Publication number
CN101686067B
CN101686067B CN 200810161461 CN200810161461A CN101686067B CN 101686067 B CN101686067 B CN 101686067B CN 200810161461 CN200810161461 CN 200810161461 CN 200810161461 A CN200810161461 A CN 200810161461A CN 101686067 B CN101686067 B CN 101686067B
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spectral density
power spectral
list item
difference
subcarrier
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CN101686067A (en
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拉斐尔·辛德瑞那
李程
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Huawei Technologies Co Ltd
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Abstract

The invention discloses a method, a device and a system for enhancing line stability. The method comprises the following steps: while initiating, calculating the difference value between the power spectral density of the silence/noise state under the worst condition and the acquired power spectral density of the current silence/noise state; while initiating, calculating the sending power spectral density of a training signal according to the power spectral density interacted with the receiving end as well as the difference value; and in the showing stage, adjusting the sending signal of the current ith subcarrier according to the difference value, wherein i is a natural number. The sending end comprises a first calculating unit, a second calculating unit and an adjusting unit. The invention can not produce any power waste or speed loss, thereby saving the resources.

Description

A kind of signal adjusting method, Apparatus and system
Technical field
The present invention relates to communication technical field, relate in particular to a kind of signal adjusting method, Apparatus and system.
Background technology
(Digital Subscriber Line, DSL) technology is that a kind of (Unshielded Twist Pair UTP) carries out the high speed transmission technology of transfer of data by unshielded twisted pair to Digital Subscriber Line.
DSL technical standard order: use BIT list item and GAIN list item to show bit number and the transmitting power that each subcarrier can carry.The BIT list item please refer to shown in the table 1:
Table 1
Figure GDA00002545618600011
In the table 1, b1, b2, b3, b4 represent subcarrier 1, subcarrier 2, subcarrier 3,4 bit numbers that can carry of subcarrier respectively, and the bit number that regulation can be carried can not surpass 15.The size of the bit number that each subcarrier can carry has determined the line speed of this self-frequency cross-talk carrier wave, and therefore, transmitting terminal is adjusted b1, b2, b3 or b4 size in the BIT list item, can change the line speed of corresponding subcarrier.
The GAIN list item please refer to shown in the table 2:
Table 2
Figure GDA00002545618600012
In the table 2, g1, g2, g3, g4 represent the data sending power of subcarrier 1, subcarrier 2, subcarrier 3, subcarrier 4 respectively.The data sending power of each subcarrier has determined this subcarrier institute energy data carried by data amount, and therefore, transmitting terminal is adjusted the size of g1, g2, g3 or g4, can change a corresponding subcarrier energy data carried by data amount.
In existing DSL system, the quick variation meeting of noise conditions exerts an influence to transmitting terminal and/or receiving terminal on the unshielded twisted pair circuit, reduces communication quality.Be specially: if after certain transmitting terminal starts, noise conditions worsens on the unshielded twisted pair circuit, and at this moment, original bit load and power division no longer have been applicable to new noise circumstance.Usually need this transmitting terminal is restarted, carry out initialization, still, this can exert an influence to the user in break in service.
Mainly contain two kinds of solutions in the prior art.A kind of scheme is the online reconfiguration scheme.In (showtime) stage displaying time, receiving terminal can measure signal to noise ratio information in real time, and signal to noise ratio is subjected to the influence of current noise conditions.Receiving terminal changes bit load and power division according to the change situation of signal to noise ratio.At ADSL, defined two kinds of concrete technology in the VDSL standard: bit exchange namely changes bit load and does not change data rate; Seamless rate adaptation (SRA) had both changed bit load and had also changed data rate.Bit exchange and seamless rate adaptation are referred to as online reconfiguration.
The Signal to Noise Ratio Margin (SNR Margin) that another kind of scheme is to use priori to determine.This scheme adopts the level of the target signal to noise ratio tolerance limit of being determined by the equipment beyond the receiving terminal when initialization, the line road of going forward side by side is activated.Ideally, if being noise level under the worst condition (worst case), the target signal to noise ratio tolerance limit of selecting deducts noise level under the current better situation.Even if noise conditions changes under the worstcase situation like this, the target signal to noise ratio tolerance limit can guarantee that also bit carries needed signal to noise ratio on the unshielded twisted pair circuit, can not produce situation about reinitializing.
The inventor is in research process, and find that there is following shortcoming at least in above-mentioned two kinds of solutions: for the online reconfiguration scheme, this scheme can only be effective to the noise of slow variation.If noise changes fast, because this scheme was carried out in the showtime stage, therefore, then this scheme can't in time be carried out the adaptive of bit load, can cause equally to reinitialize.
For the Signal to Noise Ratio Margin that priori is determined, the shortcoming of this scheme mainly is to cause a large amount of losses of activation rate or transmitted power.In this scheme, the target signal to noise ratio tolerance limit is an amount that the overall situation is unique.The noise power level of poor subcarrier when therefore, the selection of target signal to noise ratio tolerance limit has to consider worst case.For the low subcarrier of other relative noise power levels, higher target signal to noise ratio tolerance limit has just caused waste, namely can reach same speed with littler power consumption originally, or reaches higher speed with same power consumption like this.Under the very strong situation of the frequency selectivity of noise power spectrum, power dissipation may be very serious.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of method, Apparatus and system that strengthens track stability, to guarantee under the condition that economizes on resources, solves noise conditions conscientiously and changes the problem that reduces communication quality fast.
A kind of method that strengthens track stability, described method comprises:
During initialization, the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the calculating worst condition and the current noise of mourning in silence of acquisition;
During initialization, according to mutual power spectral density and the described difference of receiving terminal, the transmit power spectral density of calculation training signal;
Show time phase, adjust the transmission signal of current i subcarrier according to described difference, i is natural number.
A kind of method that strengthens track stability, described method comprises:
During initialization, the training signal that receiving end/sending end sends, the transmit power spectral density of described training signal is calculated by described transmitting terminal;
During initialization, according to described training signal channel is measured, and calculated bit list item and gain list item;
During initialization, feed back described bit list item and gain list item to described transmitting terminal.
A kind of transmitting terminal, described transmitting terminal comprises:
First computing unit is used for when initialization, the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the calculating worst condition and the current noise of mourning in silence of acquisition;
Second computing unit is used for when initialization, according to the described difference of calculating with the mutual power spectral density of receiving terminal and described first computing unit, the transmit power spectral density of calculation training signal;
Adjustment unit is used for showing time phase, and the described difference of calculating according to described first computing unit is adjusted the transmission signal of current i subcarrier, and i is natural number.
A kind of receiving terminal, described receiving terminal comprises:
Second receiving element is used for when initialization, the training signal that receiving end/sending end sends, and the transmit power spectral density of described training signal is calculated by described transmitting terminal;
Measure computing unit, be used for when initialization, according to the described training signal that described second receiving element receives channel being measured, and calculate bit list item and gain list item;
Feedback unit is used for when initialization, and described bit list item and gain list item according to described measurement computing unit calculates feed back described bit list item and gain list item to described transmitting terminal.
A kind of system that strengthens track stability, described system comprises:
Transmitting terminal is used for when initialization the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the worst condition and the current noise of mourning in silence of acquisition; According to mutual power spectral density and the described difference of receiving terminal, the transmit power spectral density of calculation training signal; Showing time phase, adjusting the transmission signal of current i subcarrier according to described difference, i is natural number;
Receiving terminal is used for when initialization, the training signal that receiving end/sending end sends, and the transmit power spectral density of described training signal is calculated by described transmitting terminal; According to described training signal channel is measured, and calculated bit list item and gain list item; Feed back described bit list item and gain list item to described transmitting terminal.
As can be seen, when transmitting terminal sends training signal to receiving terminal when initialization, reduced transmit power spectral density, and receiving terminal thinks that still transmitting terminal has used a PSD who goes out alternately to send training signal.Receiving terminal according to the PSD that goes out alternately with reducing of receiving transmit power spectral density, the situation when the state on the unshielded twisted pair circuit thought by mistake is worst case.After initial phase finishes, showing time phase, transmitting terminal is adjusted current transmission PSD gradually.Therefore, showing time phase, if the noise of unshielded twisted pair circuit changes fast, transmitting terminal can be resisted this quick variation by current transmit power spectral density is adjusted gradually.Thereby, need not to restart transmitting terminal, just can guarantee communication quality, strengthened track stability, and, because each subcarrier of the embodiment of the invention carries out, need not unified target signal to noise ratio tolerance limit be set to each subcarrier, therefore, can not produce the waste of any power and the loss of speed, effectively save resource.
Description of drawings
Fig. 1 is the inventive method embodiment flow chart;
Fig. 2 is the inventive method specific embodiment flow chart;
Fig. 3 is embodiment of the invention sending end structure figure;
Fig. 4 is embodiment of the invention receiving terminal structure chart.
Embodiment
For above-mentioned feature of the present invention, advantage are become apparent more, the present invention is described in detail below in conjunction with embodiment.
Please refer to Fig. 1, be the inventive method embodiment flow chart, comprising:
Step 101: during initialization, the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the calculating worst condition and the current noise of mourning in silence of acquisition;
Step 102: during initialization, according to mutual power spectral density and the difference of receiving terminal, the transmit power spectral density of calculation training signal;
Step 103: show time phase, adjust the current transmission signal of i subcarrier according to difference, i is natural number.
Below in conjunction with specific embodiment step 101 to step 103 is elaborated.
Please refer to Fig. 2, the specific embodiment of the invention can may further comprise the steps:
Step 201: during initialization, transmitting terminal and receiving terminal carry out information interaction, go out the first transmit power spectral density PSD alternately, are designated as PSD Ref
Step 202: during initialization, transmitting terminal is measured the current noise QLN that mourns in silence;
Those of ordinary skills know, the method that step 202 is carried out can comprise: the internal measurement of initialization procedure, apparatus measures, statistical measurement, artificially measure or Dual-Ended Loop Test delt measures etc.
Step 203: during initialization, the QLN that transmitting terminal calculating measures and the difference between the QLN under the worst condition (worst case);
In the step 203, transmitting terminal utilizes formula (1) to calculate:
noise_offset＝QLN RX_worst-QLN RX_real （1）
In the formula (1), QLN RX_worstThe noise of mourning in silence of receiving terminal under the expression worst case situation, QLN RX_realThe noise of mourning in silence that receiving terminal obtains during the expression initialization.The method that receiving terminal obtains the noise of mourning in silence can comprise: algorithm model, statistical measurement or artificial setting etc.
In the present invention, pass through QLN RX_worstWith QLN RX_realPower spectral density calculate noise_offset.
Step 204: during initialization, the PSD that transmitting terminal calculating goes out alternately RefDifference with noise_offset;
In the step 204, transmitting terminal utilizes formula (2) to calculate:
PSD TX_real＝PSD ref-noise_offset （2）
In the formula (2), PSD TX_realIt is the power spectral density that transmitting terminal will send to receiving terminal when initialization.The purpose that it is pointed out that transmitting terminal execution in step 204 is in order to influence the measurement result of receiving terminal, to make receiving terminal think that current channel condition is worst state by mistake.
Step 205: during initialization, transmitting terminal uses PSD TX_realSend training signal to receiving terminal;
Step 206: during initialization, receiving terminal is according to the PSD of transmitting terminal TX_realChannel is measured;
In the step 206, receiving terminal thinks that transmitting terminal can use PSD mutual in step 201 Ref, and receiving terminal and do not know PSD TX_realNot PSD mutual in step 201 Ref, therefore, receiving terminal can be with PSD mutual in the step 201 RefBe benchmark, according to PSD TX_realChannel is measured, and here, channel is specially the unshielded twisted pair circuit.
Because PSD TX_realRelative PSD RefReduced noise_offset, so the channel status that receiving terminal is measured will be than actual conditions difference.Specifically see also the derivation of formula (3)-(5):
|H measure| 2
＝PSD RX-PSD ref
=PSD TX_real+|H real| 2-PSD ref
=PSD ref-noise_offset＋|H real| 2-PSD ref
＝|H real| 2-noise_offset （3）
In the formula (3), | H Measure| 2The power channel that the expression receiving terminal is measured, PSD RXThe power spectral density of the training signal that the expression receiving terminal receives, | H Real| 2The power channel that expression is actual.
Receiving terminal carries out time domain equalization FEQ to be handled:
Signal FEQ
＝Signal RX/H measure
＝Signal TX＋error RX/H measure （4）
In the formula (4), Signal FEQThe signal behind the FEQ, Signal are carried out in expression RXExpression receives signal, H MeasureThe channel that expression is measured, Signal TXExpression sends signal, error RXThe expression error.
Receiving terminal calculates the normalization jamtosignal:
NSR measure
＝|error RX/H measure| 2
＝QLN RX_real-|H measure| 2
＝QLN RX_real-|H real| 2＋noise_offset
＝QLN RX_worst-|H real| 2
=NSR worst
（5）
In the formula (5), NSR MeasureThe normalization jamtosignal that expression is measured.
From formula (5) as can be seen, receiving terminal is according to PSD TX_realThe normalization jamtosignal that calculates is identical with channel under worst condition.
Step 207: during initialization, receiving terminal calculates BIT list item and GAIN list item according to the measurement result to channel;
Calculating BIT list item and GAIN list item is prior art.It is pointed out that because the PSD that receiving terminal calculates TX_realIdentical under worst condition with channel, so, according to PSD TX_realThe BIT list item that calculates is also identical under worst condition with channel with the GAIN list item.
Step 208: during initialization, BIT list item and GAIN list item that receiving terminal calculates to the transmitting terminal feedback;
Step 209: in the showtime stage, transmitting terminal is adjusted current transmission signal according to BIT list item and the GAIN list item of receiving terminal feedback, and current transmission signal is adjusted noise_offset gradually.
In the step 209, calculate the current transmission signal of i subcarrier by formula (6):
Z i = RSD TX _ real PSD MAX * g i * tss i * χ ( b i ) * ( X i + jY i )
In the formula (6), Z iRepresent current transmission signal, PSD MAXThe highest MASK of expression DSL standard code, g iExpression g table, tss iThe shaping of expression transmitted power spectrum, χ (b i) the expression planisphere normalization factor, the planisphere normalization factor is calculated X by the bit list item iExpression constellation point coordinate x axle component, Y iExpression constellation point coordinate y axle component.
By formula (7) the transmission signal of current i subcarrier is adjusted noise_offset gradually:
Z i = RSD TX _ real + noise _ offset PSD MAX * g i * tss i * χ ( b i ) * ( X i + jY i )
= RSD TX _ ref PSD MAX * g i * tss i * χ ( b i ) * ( X i + jY i ) - - - ( 7 )
In the formula (7), PSDTX_real is adjusted to PSDTX_ref adopt the mode of adjusting gradually, can take the single adjustment, also can take repeatedly to adjust.The step-length of adjusting depend on FEQ adaptive tracing algorithm ability and, step-length such as can be at step-length, also can be variable step.
It is pointed out that formula (6) only is the preferable implementation of the embodiment of the invention, the formula of the current transmission of other various transmitting terminals adjustment PSD is the applicable embodiment of the invention all, just current transmission signal need be adjusted noise_offset gradually equally.
As can be seen, because in the inventive method specific embodiment, when transmitting terminal sends training signal to receiving terminal when initialization, will send PSD and reduce noise_offset, and receiving terminal thinks that still transmitting terminal has used the PSD transmission training signal that goes out alternately.Receiving terminal is according to the PSD that goes out alternately and the transmission PSD that has reduced noise_offset that receives, the situation when the state on the unshielded twisted pair circuit thought by mistake is worst case.After initial phase finished, in the showtime stage, transmitting terminal was adjusted noise_offset gradually with current transmission signal.Therefore, in the showtime stage, if the noise of unshielded twisted pair circuit changes fast, transmitting terminal can be resisted this quick variation by adjusting noise_offset gradually.Thereby, need not to restart transmitting terminal, just can guarantee communication quality, strengthened track stability, and, because the embodiment of the invention is carried out at each subcarrier, need not unified target signal to noise ratio tolerance limit be set to each subcarrier, therefore, can not produce the waste of any power and the loss of speed, effectively save resource.
Please refer to Fig. 3, the sending end structure figure for the embodiment of the invention provides can comprise:
First computing unit 301 is used for when initialization, the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the calculating worst condition and the current noise of mourning in silence of acquisition;
Second computing unit 302 is used for when initialization, according to the described difference of calculating with the mutual power spectral density of receiving terminal and described first computing unit, the transmit power spectral density of calculation training signal;
Adjustment unit 303 is used for showing time phase, and the described difference of calculating according to described first computing unit is adjusted the transmission signal of current i subcarrier, and i is natural number.
The associated methods specific embodiment, transmitting terminal shown in Figure 3 can also comprise:
First receiving element 304 is used for when initialization, receives bit list item and the gain list item of described receiving terminal feedback.
Adjustment unit can comprise:
The 3rd computing unit 303-1 is used for the described bit list item that receives according to described first receiving element and the list item that gains, and calculates the current transmission signal of described i subcarrier;
Described adjustment unit 303 is used for adjusting according to the described difference that described first computing unit calculates the current transmission signal of the described i subcarrier of described the 3rd computing unit calculating.
Please refer to Fig. 4, the receiving terminal structure chart for the embodiment of the invention provides can comprise:
Second receiving element 401 is used for when initialization, the training signal that receiving end/sending end sends, and the transmit power spectral density of described training signal is calculated by described transmitting terminal;
Measure computing unit 402, be used for when initialization, according to the described training signal that described second receiving element receives channel being measured, and calculate bit list item and gain list item;
Feedback unit 403 is used for when initialization, and described bit list item and gain list item according to described measurement computing unit calculates feed back described bit list item and gain list item to described transmitting terminal.
Be elaborated below in conjunction with the step of method specific embodiment to each unit of Fig. 3 and each unit execution of Fig. 4.
During initialization, first computing unit 301 utilizes formula (1) to calculate the QLN of acquisition and the difference between the QLN under the worst case, the PSD that second computing unit 302 utilizes formula (2) calculating to go out alternately RefDifference with noise_offset is designated as PSD with difference TX_realThe PSD that transmitting terminal uses second computing unit 302 to calculate TX_realSend training signal to receiving terminal.
During initialization, the training signal that second receiving element 401 of receiving terminal receives from transmitting terminal is measured computing unit 402 according to PSD TX_realChannel is measured, and calculated BIT list item and GAIN list item.The feedback unit 403 of receiving terminal is according to measuring BIT list item and the GAIN list item that computing unit 402 calculates, to transmitting terminal feedback BITE list item and GAIN list item.
During initialization, first receiving element 304 of transmitting terminal receives BIT list item and the GAIN list item of receiving terminal feedback.
In the showtime stage, the 3rd computing unit 303-1 calculates the current transmission signal of i subcarrier according to formula (6), adjustment unit 303 is adjusted the current transmission signal of the i subcarrier of the 3rd computing unit 303-1 calculating according to the difference that first computing unit 301 calculates.
It is identical with the description of method specific embodiment that adjustment unit 303 is adjusted, and do not repeat them here.
As can be seen, receiving terminal is according to the PSD that goes out alternately and the transmission PSD that has reduced noise_offset that receives, the situation when the state on the unshielded twisted pair circuit thought by mistake is worst case.After initial phase finished, in the showtime stage, transmitting terminal was adjusted noise_offset gradually with current transmission signal.Therefore, in the showtime stage, if the noise of unshielded twisted pair circuit changes fast, transmitting terminal can be resisted this quick variation by adjusting noise_offset gradually.Thereby, need not to restart transmitting terminal, just can guarantee communication quality, strengthened track stability, and, because the embodiment of the invention is carried out at each subcarrier, need not unified target signal to noise ratio tolerance limit be set to each subcarrier, therefore, can not produce the waste of any power and the loss of speed, effectively save resource.
The embodiment of the invention also provides a kind of system, can comprise:
Transmitting terminal is used for when initialization the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the worst condition and the current noise of mourning in silence of acquisition; According to mutual power spectral density and the described difference of receiving terminal, the transmit power spectral density of calculation training signal; Showing time phase, adjusting the transmission signal of current i subcarrier according to described difference, i is natural number;
Receiving terminal is used for when initialization, the training signal that receiving end/sending end sends, and the transmit power spectral density of described training signal is calculated by described transmitting terminal; According to described training signal channel is measured, and calculated bit list item and gain list item; Feed back described bit list item and gain list item to described transmitting terminal.
Wherein, transmitting terminal is identical with the inventive method specific embodiment with the operation that receiving terminal is carried out, and specifically sees also the description of method specific embodiment.
At last, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.Do not having under the situation of more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware, but the former is better execution mode under a lot of situation.Based on such understanding, all or part of can the embodying with the form of software product that technical scheme of the present invention contributes to background technology, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
More than a kind of method, Apparatus and system that strengthens track stability provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (8)

1. a signal adjusting method is applied to the digital user wire DSL system, it is characterized in that, described method comprises:
During initialization, go out power spectral density alternately with receiving terminal, the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the calculating worst condition and the current noise of mourning in silence of acquisition;
During initialization, according to the described power spectral density that goes out alternately and described difference, the transmit power spectral density of calculation training signal, and the transmit power spectral density of described training signal sent to described receiving terminal;
During initialization, receive bit list item and the gain list item of described receiving terminal feedback, described bit list item and gain list item are to be benchmark by described receiving terminal with the described power spectral density that goes out alternately, according to the transmit power spectral density of described training signal channel measured, and calculate;
Show time phase, calculate the current transmission signal of i subcarrier according to described bit list item and gain list item, adjust the described current transmission signal of described i subcarrier according to described difference, i is natural number.
2. method according to claim 1 is characterized in that, comprises according to described bit list item and the current transmission signal that the gain list item calculates described i subcarrier:
Calculate the current transmission signal of described i subcarrier according to the power spectrum upper limit, gain list item, the shaping of transmitted power spectrum, planisphere normalization factor, constellation point coordinate x axle component and the constellation point coordinate y axle component of current transmit power spectral density, DSL standard code, wherein, described planisphere normalization factor is calculated by the bit list item.
3. method according to claim 1 is characterized in that, the described current transmission signal of adjusting described i subcarrier according to described difference comprises:
According to described difference, single is adjusted the described current transmission signal of described i subcarrier;
Perhaps, according to described difference, repeatedly adjust the described current transmission signal of described i subcarrier.
4. method according to claim 3 is characterized in that, the described current transmission signal of repeatedly adjusting described i subcarrier comprises:
Repeatedly adjust the described current transmission signal of described i subcarrier etc. step-length;
Perhaps, variable step is repeatedly adjusted the described current transmission signal of described i subcarrier.
5. a signal adjusting method is applied to the digital user wire DSL system, it is characterized in that, described method comprises:
During initialization, go out power spectral density alternately with transmitting terminal;
During initialization, receive the transmit power spectral density of the training signal of described transmitting terminal transmission, the transmit power spectral density of described training signal is to be calculated according to the described power spectral density that goes out alternately and difference by described transmitting terminal, and described difference is the difference of power spectral density of the power spectral density of noise and the current noise of mourning in silence of mourning in silence under the worst condition;
During initialization, be benchmark with the described power spectral density that goes out alternately, according to the transmit power spectral density of described training signal channel measured, and calculate bit list item and gain list item;
During initialization, feed back described bit list item and gain list item to described transmitting terminal.
6. a transmitting terminal is applied to the digital user wire DSL system, it is characterized in that, described transmitting terminal comprises:
First computing unit is used for going out power spectral density alternately with receiving terminal when initialization, the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the calculating worst condition and the current noise of mourning in silence of acquisition;
Second computing unit, be used for when initialization, the described difference that the power spectral density that goes out alternately according to described and receiving terminal and described first computing unit calculate, the transmit power spectral density of calculation training signal, and the transmit power spectral density of described training signal sent to described receiving terminal;
First receiving element, be used for when initialization, receive bit list item and the gain list item of described receiving terminal feedback, described bit list item and gain list item are to be benchmark by described receiving terminal with the described power spectral density that goes out alternately, transmit power spectral density according to described training signal is measured channel, and calculate;
Adjustment unit is used for showing time phase, and the described difference of calculating according to described first computing unit is adjusted the transmission signal of current i subcarrier, and i is natural number;
Wherein, described adjustment unit comprises the 3rd computing unit, is used for the described bit list item that receives according to described first receiving element and the list item that gains, and calculates the current transmission signal of described i subcarrier;
Described adjustment unit is used for adjusting according to the described difference that described first computing unit calculates the current transmission signal of the described i subcarrier of described the 3rd computing unit calculating.
7. a receiving terminal is applied to the digital user wire DSL system, it is characterized in that, described receiving terminal comprises:
Second receiving element, be used for when initialization, go out power spectral density alternately with transmitting terminal, receive the transmit power spectral density of the training signal of described transmitting terminal transmission, the transmit power spectral density of described training signal is to be calculated according to the described power spectral density that goes out alternately and difference by described transmitting terminal, and described difference is the difference of power spectral density of the power spectral density of noise and the current noise of mourning in silence of mourning in silence under the worst condition;
Measuring computing unit, be used for when initialization, is benchmark with the described power spectral density that goes out alternately, and the transmit power spectral density of the described training signal that receives according to described second receiving element measures channel, and calculates bit list item and gain list item;
Feedback unit is used for when initialization, and described bit list item and gain list item according to described measurement computing unit calculates feed back described bit list item and gain list item to described transmitting terminal.
8. a signal Adjustment System is applied to the digital user wire DSL system, it is characterized in that, described system comprises:
Transmitting terminal is used for going out power spectral density alternately with receiving terminal when initialization, the difference of the power spectral density of the power spectral density of the noise of mourning in silence under the calculating worst condition and the current noise of mourning in silence of acquisition; According to the described power spectral density that goes out alternately and described difference, the transmit power spectral density of calculation training signal, and the transmit power spectral density of described training signal sent to described receiving terminal; During initialization, receive bit list item and the gain list item of described receiving terminal feedback, described bit list item and gain list item are to be benchmark by described receiving terminal with the described power spectral density that goes out alternately, according to the transmit power spectral density of described training signal channel measured, and calculate; Showing time phase, calculating the current transmission signal of i subcarrier according to described bit list item and gain list item, adjusting the described current transmission signal of described i subcarrier according to described difference, i is natural number;
Receiving terminal, be used for when initialization, go out power spectral density alternately with transmitting terminal, receive the transmit power spectral density of the training signal of described transmitting terminal transmission, the transmit power spectral density of described training signal is to be calculated according to the described power spectral density that goes out alternately and described difference by described transmitting terminal; Be benchmark with the described power spectral density that goes out alternately, according to the transmit power spectral density of described training signal channel measured, and calculate bit list item and gain list item; Feed back described bit list item and gain list item to described transmitting terminal.
CN 200810161461 2008-09-27 2008-09-27 Method, device and system for enhancing line stability Expired - Fee Related CN101686067B (en)

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CN 200810161461 CN101686067B (en) 2008-09-27 2008-09-27 Method, device and system for enhancing line stability

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Application Number Priority Date Filing Date Title
CN 200810161461 CN101686067B (en) 2008-09-27 2008-09-27 Method, device and system for enhancing line stability

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CN101686067A CN101686067A (en) 2010-03-31
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CN1753442A (en) * 2004-09-23 2006-03-29 阿尔卡特公司 Multi-carrier modem transmitter with controlled transmit signal quality degradation
CN1863259A (en) * 2005-09-26 2006-11-15 华为技术有限公司 Method and apparatus for automatically selecting operation mode in XDSL network
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CN101133564A (en) * 2005-03-03 2008-02-27 适应性频谱和信号校正股份有限公司 DSL state and line profile control

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US7151803B1 (en) * 2002-04-01 2006-12-19 At&T Corp. Multiuser allocation method for maximizing transmission capacity
CN1661995A (en) * 2004-02-26 2005-08-31 阿尔卡特公司 Digital subscriber line modem with bitloading using channel condition model
CN1753442A (en) * 2004-09-23 2006-03-29 阿尔卡特公司 Multi-carrier modem transmitter with controlled transmit signal quality degradation
CN101133564A (en) * 2005-03-03 2008-02-27 适应性频谱和信号校正股份有限公司 DSL state and line profile control
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