CN105830353B

CN105830353B - The methods, devices and systems that signal is sent

Info

Publication number: CN105830353B
Application number: CN201480033634.5A
Authority: CN
Inventors: 涂建平; 付饶; 易溪林
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-11-28
Filing date: 2014-11-28
Publication date: 2018-03-09
Anticipated expiration: 2034-11-28
Also published as: WO2016082221A1; CN105830353A

Abstract

The embodiment of the present invention provides the methods, devices and systems that a kind of signal is sent, and by disturbing user terminal to receive the power back-off parameters that central office side is sent, power back-off parameters include the scope of overlaid frequency；Because interference user terminal is according to the first PSD masks of the scope of overlaid frequency the first subcarrier of acquisition, user terminal is disturbed to determine the PSD used by the first subcarrier sends upward signal according to the first PSD masks of the first subcarrier, PSD is less than or equal to the first PSD masks of the first subcarrier used by the first subcarrier sends upward signal.So as to reduce NEXT influence.

Description

The methods, devices and systems that signal is sent

Technical field

The present embodiments relate to the communication technology, more particularly to the methods, devices and systems that a kind of signal is sent.

Background technology

Cross-talk is most common a kind of phenomenon in telephone network system, and cross-talk refers to due to electromagnetic induction principle, same Digital Subscriber Line Access Multiplexer (Digital Subscriber Line Access Multiplexer, hereinafter referred to as： DSLAM interference is mutually produced between multiple signals), receiving terminal is received the signal of All other routes.

In the prior art, in order to solve the problems, such as cross-talk, up channel and down channel use the technology of frequency division multiplexing, That is, the transmission of the transmission of upward signal and downstream signal uses different frequencies, in such a scenario, near-end crosstalk (Near- End Crosstalk, hereinafter referred to as：NEXT) performance impact of system can be ignored, FEXT (Far-end Crosstalk, hereinafter referred to as：FEXT) combined transceiving is carried out to support in central office side using vector quantization (Vectoring) technology Disappear, wherein, NEXT refers to that receiving terminal receives the signal that the transmitting terminal of the same side is sent, and FEXT refers to that receiving terminal receives opposite end All other routes signal.

However, due to digital subscriber line (Digital Subscriber Line, hereinafter referred to as：DSL) frequency spectrum resource has Limit, in order to improve the availability of frequency spectrum, the mechanics of communication of same-frequency duplexing can be used, i.e. up-downgoing is entered using identical frequency range Row signal is transmitted, and in this way, NEXT is influenceed serious on overlaid frequency, and the method for prior art can not be used to reduce NEXT influence.

The content of the invention

The embodiment of the present invention provides the methods, devices and systems that a kind of signal is sent, to reduce NEXT influence.

First aspect of the embodiment of the present invention provides a kind of method that signal is sent, including：

User terminal is disturbed to receive the power back-off parameters that central office side is sent, the power back-off parameters include overlapping frequency The scope of rate, the scope of the overlaid frequency refer to the upstream frequency and the downstream frequency of disturbed user terminal of the interference user terminal Overlapping scope；

The interference user terminal obtains the first power spectral density PSD of the first subcarrier according to the scope of the overlaid frequency Mask, the first PSD masks are used for limiting the interference user terminal in first subcarrier transmission upward signal PSD maximum, first subcarrier be the overlaid frequency in the range of any subcarrier；

The interference user terminal determines to send in first subcarrier according to the first PSD masks of first subcarrier PSD used by upward signal, the PSD used by first subcarrier sends upward signal are less than or equal to described the First PSD masks of one subcarrier.

With reference in a first aspect, in the first possible implementation of first aspect, gone back in the power back-off parameters Include the 2nd PSD masks of first subcarrier, office's instruction interference user terminal is in institute centered on the 2nd PSD masks State the first subcarrier send upward signal used by PSD higher limit；

The interference user terminal determines to send in first subcarrier according to the first PSD masks of first subcarrier PSD used by upward signal, including：

The interference user terminal is according to the second of the first PSD masks of first subcarrier and first subcarrier PSD masks determine the PSD used by first subcarrier sends upward signal, wherein, it is described in first subcarrier PSD is less than or equal to the 2nd PSD masks of first subcarrier used by transmission upward signal.

With reference to the possible implementation of the first of first aspect or first aspect, in second of possible implementation In, the interference user terminal obtains the first PSD masks of the first subcarrier according to the scope of the overlaid frequency, including：

The interference user terminal is made an uproar according to the disturbed user terminal in the reference that the first subcarrier down direction receives The power spectral density of sound and the intensity of near-end crosstalk channel, obtain the first PSD masks of first subcarrier.

With reference to second of possible implementation of first aspect, in the third possible implementation, when described dry Disturb user terminal circuit electrical equipment length and the disturbed user terminal circuit electrical equipment equal length when,

The interference user terminal is made an uproar according to the disturbed user terminal in the reference that the first subcarrier down direction receives The power spectral density of sound and the intensity of near-end crosstalk channel, the first PSD masks of first subcarrier are obtained, including：

According to formula

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next, f) and-Δ+3.5 [dBm/Hz]

The first PSD masks of first subcarrier are obtained,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents that first son carries Ripple, the REFRXNPSD_ds(f) work(for the reference noise that disturbed user terminal receives in the first subcarrier down direction is represented Rate spectrum density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f)= 10log₁₀(K_next·f^3/2), K_nextThe coefficient of coup of near-end crosstalk is represented, Δ represents that control near-end crosstalk influences the fine setting of size The factor.

With reference to second of possible implementation of first aspect, in the 4th kind of possible implementation, when described dry Disturb user terminal circuit electrical equipment length and the disturbed user terminal circuit electrical equipment length it is unequal when,

According to formula

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next, f)+LOSS (| kl₀-kl_{0, REF}|, f)-Δ +3.5[dBm/Hz]

The first PSD masks of first subcarrier are obtained,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents that first son carries Ripple, the REFRXNPSD_ds(f) work(for the reference noise that disturbed user terminal receives in the first subcarrier down direction is represented Rate spectrum density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f)= 10log₁₀(K_next·f^3/2), K_nextThe coefficient of coup of expression near-end crosstalk, LOSS (| kl₀-kl_{0, REF}|, f) near-end crosstalk channel Decay,kl₀Represent the circuit electrical equipment length of interference user terminal, kl_{0, REF} The circuit electrical equipment length with reference to disturbed user terminal is represented, the electrical equipment length with reference to disturbed user terminal is at least one disturbed use The equivalent electrical equipment length of the electrical equipment length at family end, Δ represent that control near-end crosstalk influences the fine setting factor of size.

With reference to first aspect or second of possible implementation of first aspect, in the 5th kind of possible implementation In, the interference user terminal obtains the first power spectral density PSD mask of the first subcarrier according to the scope of the overlaid frequency, Including：

The interference user terminal is according to descending in first subcarrier with the central office side that the disturbed user terminal is connected The power spectral density of reference noise and the intensity of near-end crosstalk channel that direction is sent, obtain the first of first subcarrier PSD masks.

With reference to the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation, when described dry Disturb user terminal circuit electrical equipment length be less than or equal to the disturbed user terminal circuit electrical equipment length when,

The interference user terminal is according to descending in first subcarrier with the central office side that the disturbed user terminal is connected The power spectral density of reference noise and the intensity of near-end crosstalk channel that direction is sent, obtain the first of first subcarrier PSD masks, including：

According to formula：

OPBOMASK (f)=REFTXNPSD_ds(f)-NEXTChannel(K_next, f) and+LOSS (kl₀, f) and-Δ+3.5 [dBm/Hz]

The first PSD masks of first subcarrier are obtained,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents that first son carries Ripple, the REFTXNPSD_ds(f) represent with the central office side that the disturbed user terminal is connected in the descending side of first subcarrier To the power spectral density of the reference noise of transmission, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel(K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (kl₀, f) The direct channels decay of interference user is represented,Wherein, kl₀Represent the line electricity of interference user terminal Device length, Δ represent that control near-end crosstalk influences the fine setting factor of size.

With reference to the 5th kind of possible implementation of first aspect, in the 7th kind of possible implementation, when described dry Disturb user terminal circuit electrical equipment length be more than or equal to the disturbed user terminal circuit electrical equipment length when,

According to formula：

OPBOMASK (f)=REFTXNPSD_ds(f)-NEXTChannel(K_next, f) and+LOSS (2kl_{0, REF}-kl₀, f) and-Δ+ 3.5[dBm/Hz]

The first PSD masks of first subcarrier are obtained,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents that first son carries Ripple, the REFTXNPSD_ds(f) represent with the central office side that the disturbed user terminal is connected in the descending side of first subcarrier To the power spectral density of the reference noise of transmission, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel(K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (2kl_{0, REF}-kl₀, f) and represent that the direct channels of interference user decay,kl₀Represent the line of interference user terminal Road electrical equipment length, kl_{0, REF}Represent the circuit electrical equipment length with reference to disturbed user terminal, the electrical equipment length with reference to disturbed user terminal It is the equivalent electrical equipment length of the electrical equipment length of at least one disturbed user terminal, Δ represents that control near-end crosstalk influences the fine setting of size The factor.

With reference to first aspect the first into the 7th kind of possible implementation any possible implementation, In eight kinds of possible implementations, the first PSD masks and described first for disturbing user terminal according to first subcarrier 2nd PSD masks of subcarrier determine the PSD used by first subcarrier sends upward signal, including：

The interference user terminal is according to the first PSD masks of first subcarrier, the 2nd PSD of first subcarrier 3rd PSD masks of mask and first subcarrier determine the PSD used by first subcarrier sends upward signal, Wherein, the PSD used by first subcarrier sends upward signal is less than or equal to the 3rd of first subcarrier PSD masks, the 3rd PSD masks of first subcarrier represent interference user terminal up direction in Initial Channel Assignment discovery phase The highest PSD used is initially limited.

With reference to first aspect the first into the 8th kind of possible implementation any possible implementation, In nine kinds of possible implementations, the interference user terminal receives the power back-off parameters that central office side is sent, including：

The interference user terminal passes through power back-off parameters described in O-SIGNATURE message sinks.

Second aspect of the embodiment of the present invention provides the device that a kind of signal is sent, including：

Receiving module, the power back-off parameters sent for central office side, the power back-off parameters include overlapping frequency The scope of rate, the scope of the overlaid frequency refer to the upstream frequency and the downstream frequency of disturbed user terminal of the interference user terminal Overlapping scope；

Acquisition module, for obtaining the first power spectral density PSD of the first subcarrier according to the scope of the overlaid frequency Mask, the first PSD masks are used for limiting the interference user terminal in first subcarrier transmission upward signal PSD maximum, first subcarrier be the overlaid frequency in the range of any subcarrier；

Processing module, for determining to send in first subcarrier according to the first PSD masks of first subcarrier PSD used by upward signal, the PSD used by first subcarrier sends upward signal are less than or equal to described the First PSD masks of one subcarrier.

With reference to second aspect, in the first possible implementation of second aspect, gone back in the power back-off parameters Include the 2nd PSD masks of first subcarrier, office's instruction interference user terminal is in institute centered on the 2nd PSD masks State the first subcarrier send upward signal used by PSD higher limit；

The processing module is specifically used for according to the first PSD masks of first subcarrier and first subcarrier 2nd PSD masks determine the PSD used by first subcarrier sends upward signal, wherein, it is described in the described first son PSD is less than or equal to the 2nd PSD masks of first subcarrier used by carrier wave transmission upward signal.

With reference to the possible implementation of the first of second aspect or second aspect, in second of possible implementation In, the acquisition module is specifically used for being made an uproar in the reference that the first subcarrier down direction receives according to the disturbed user terminal The power spectral density of sound and the intensity of near-end crosstalk channel, obtain the first PSD masks of first subcarrier.

With reference to second of possible implementation of second aspect, in the third possible implementation, when described dry Disturb user terminal circuit electrical equipment length and the disturbed user terminal circuit electrical equipment equal length when,

The acquisition module is specifically used for according to formula：

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next, f) and-Δ+3.5 [dBm/Hz]

The first PSD masks of first subcarrier are obtained,

With reference to second of possible implementation of second aspect, in the 4th kind of possible implementation, when described dry Disturb user terminal circuit electrical equipment length and the disturbed user terminal circuit electrical equipment length it is unequal when,

The acquisition module is specifically used for according to formula

The first PSD masks of first subcarrier are obtained,

With reference to second aspect or second of possible implementation of second aspect, in the 5th kind of possible implementation In, the acquisition module is specifically used for according to descending in first subcarrier with the central office side that the disturbed user terminal is connected The power spectral density of reference noise and the intensity of near-end crosstalk channel that direction is sent, obtain the first of first subcarrier PSD masks.

With reference to the 5th kind of possible implementation of second aspect, in the 6th kind of possible implementation, when described dry Disturb user terminal circuit electrical equipment length be less than or equal to the disturbed user terminal circuit electrical equipment length when,

The acquisition module is specifically used for according to formula：

The first PSD masks of first subcarrier are obtained,

With reference to the 5th kind of possible implementation of second aspect, in the 7th kind of possible implementation, when described dry Disturb user terminal circuit electrical equipment length be more than or equal to the disturbed user terminal circuit electrical equipment length when,

The acquisition module is specifically used for according to formula：

The first PSD masks of first subcarrier are obtained,

With reference to second aspect the first into the 7th kind of possible implementation any possible implementation, In eight kinds of possible implementations, the processing module is specifically used for according to the first PSD masks of first subcarrier, described 2nd PSD masks of the first subcarrier and the 3rd PSD masks of first subcarrier determine to send in first subcarrier PSD used by upward signal, wherein, the PSD used by first subcarrier sends upward signal is less than or equal to 3rd PSD masks of first subcarrier, the 3rd PSD masks of first subcarrier represent interference user terminal up direction Initially limited in the highest PSD that Initial Channel Assignment discovery phase uses.

With reference to second aspect the first into the 8th kind of possible implementation any possible implementation, In nine kinds of possible implementations, the receiving module is specifically used for passing through back-off described in O-SIGNATURE message sinks Parameter.

The third aspect of the embodiment of the present invention provides the device that a kind of signal is sent, including：

Memory and processor, the memory are used to store the code for performing the method that signal is sent；The processor For calling the code, following operation is performed：

The power back-off parameters that central office side is sent are received, the power back-off parameters include the scope of overlaid frequency, The scope of the overlaid frequency refers to the upstream frequency of the interference user terminal model overlapping with the downstream frequency of disturbed user terminal Enclose；The first power spectral density PSD mask of the first subcarrier is obtained according to the scope of the overlaid frequency, the first PSD is covered Mould is used for the maximum for limiting interference user terminal PSD used by first subcarrier sends upward signal, described First subcarrier is any subcarrier in the range of the overlaid frequency；According to the first PSD masks of first subcarrier It is determined that the PSD used by first subcarrier sends upward signal, described to send upward signal in first subcarrier Used PSD is less than or equal to the first PSD masks of first subcarrier.

Fourth aspect of the embodiment of the present invention provides a kind of signal sending system, including：

At least two subscribers' lines, one end of every subscribers' line are connected with central office side, the other end and user terminal Connection, the user terminal are disturbed user terminal or interference user terminal；

The interference user terminal is that the described signal in any possible implementation such as second aspect sends dress Put.

The methods, devices and systems that signal provided in an embodiment of the present invention is sent, by disturbing user terminal to receive central office The power back-off parameters sent are held, power back-off parameters include the scope of overlaid frequency；Because interference user terminal is according to overlapping The scope of frequency obtains the first PSD masks of the first subcarrier, and interference user terminal is true according to the first PSD masks of the first subcarrier It is scheduled on the first subcarrier and sends PSD used by upward signal, wherein, used by the first subcarrier sends upward signal PSD is less than or equal to the first PSD masks of the first subcarrier.First subcarrier refers to any subcarrier of overlapping frequency range, User is exactly disturbed to send PSD used by upward signal, it is contemplated that the influence of the first subcarrier in overlapping frequency range, PSD is limited to the first PSD of the first subcarrier used by transmission upward signal on the first subcarrier in overlapping frequency range In the range of mask, so as to reduce NEXT influence.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other accompanying drawings according to these accompanying drawings.

Fig. 1 is the schematic flow sheet for the embodiment of the method one that signal of the present invention is sent；

Fig. 2 is the first application scenarios schematic diagram of the method for signal of the present invention transmission；

Fig. 3 a are the schematic diagram of method application scenarios 2 that signal of the present invention is sent；

Fig. 3 b are another schematic diagram for the method application scenarios 2 that signal of the present invention is sent；

Fig. 4 is the structural representation for the device embodiment one that signal of the present invention is sent；

Fig. 5 is the structural representation for the device embodiment two that signal of the present invention is sent.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.

The present invention is included by disturbing user terminal to receive the power back-off parameters that central office side is sent in power back-off parameters The scope of overlaid frequency, multiple subcarriers is included in the range of overlaid frequency, for convenience, with it in embodiments below In a subcarrier exemplified by be described, the subcarrier is referred to as the first subcarrier, and those skilled in the art are appreciated that completely First subcarrier refers to any subcarrier in overlapping frequency range.User terminal is disturbed to obtain the according to the scope of overlaid frequency One subcarrier the first power spectral density (Power spectral density, hereinafter referred to as：PSD) mask, user terminal is disturbed PSD is less than or equal to the first PSD masks of above-mentioned first subcarrier used by the first subcarrier sends upward signal, that is, Disturb user terminal PSD used by the first subcarrier sends upward signal, it is contemplated that the first son in overlapping frequency range carries The influence of ripple, PSD used by upward signal is sent on the first subcarrier in overlapping frequency range is limited to the first son and carry In the range of first PSD masks of ripple, so as to reduce NEXT influence.

It should be noted that the interference user terminal described in following each embodiments and disturbed user are addressed in the present invention End, refers to due to electromagnetic induction principle, the transmission letter of a root user circuit in two or more subscribers' lines closer to the distance The phenomenon of interference number is produced to the transmission signal of another root user circuit, (will can also be turned into producing the subscribers' line of interference Interference source) connection user terminal be referred to as disturb user terminal, the user terminal being connected with disturbed subscribers' line is referred to as disturbed use Family end.

Technical scheme is described in detail with specifically embodiment below.These specific implementations below Example can be combined with each other, and may be repeated no more for same or analogous concept or process in some embodiments.

Fig. 1 is the schematic flow sheet for the embodiment of the method one that signal of the present invention is sent, as shown in figure 1, the present embodiment is held Row main body be interference user terminal, more specifically refer to user front end device (Customer Premises Equipment, below Referred to as：CPE), the method for the present embodiment is as follows：

S101：User terminal is disturbed to receive the power back-off parameters that central office side is sent.

Wherein, power back-off parameters include the scope of overlaid frequency, and the scope of overlaid frequency refers to disturb user terminal The upstream frequency scope overlapping with the downstream frequency of disturbed user terminal.

The frequency of multiple subcarriers is included in the range of overlaid frequency.

Generally, when central office side initializes beginning, returned by O-SIGNATURE message to interference user terminal transmit power Parameter is moved back, correspondingly, interference user terminal passes through O-SIGNATURE message sink power back-off parameters.

S102：User terminal is disturbed to obtain the first PSD masks of the first subcarrier according to the scope of overlaid frequency.

Wherein, the first PSD masks are used to limit interference user terminal PSD used by the first subcarrier sends upward signal Maximum.

According to the circuit electrical equipment length of interference user terminal and the relation of the circuit electrical equipment length of disturbed user terminal, first is obtained First PSD masks of subcarrier can have a variety of acquisition modes, the invention is not limited in this regard.

S103：User terminal is disturbed to be determined according to the first PSD masks of the first subcarrier in the transmission of above-mentioned first subcarrier PSD used by row signal.

Wherein, user terminal PSD used by above-mentioned first subcarrier sends upward signal is disturbed to be less than or equal to above-mentioned the First PSD masks of one subcarrier.

Generally, during initializing and transmitting data time, interference user terminal sends signal in the first subcarrier and used PSD be necessarily less than the first PSD masks equal to first subcarrier.

In the present embodiment, by disturbing user terminal to receive the power back-off parameters that central office side is sent, power back-off parameters Include the scope of overlaid frequency；Because interference user terminal is according to the first PSD of the scope of overlaid frequency the first subcarrier of acquisition Mask；User terminal is disturbed to be determined to send upward signal institute on first subcarrier according to the first PSD masks of the first subcarrier The PSD of use, wherein, PSD is less than or equal to the of first subcarrier used by first subcarrier sends upward signal One PSD masks.Namely user is disturbed to send PSD used by upward signal, it is contemplated that the first son in overlapping frequency range The influence of carrier wave, PSD is limited to the first subcarrier used by sending upward signal on the first subcarrier in overlapping range The first PSD masks in the range of, so as to, reduce NEXT influence.

In the above-described embodiments, in the power back-off parameters that central office side is sent to interference user terminal, in addition to above-mentioned the 2nd PSD masks of one subcarrier, the 2nd PSD masks are the dry of the configuration calculating that central office side defines according to NMS The transmission PSD masks of user terminal are disturbed, in other words, office's instruction interference user terminal is sent out in the first subcarrier centered on the 2nd PSD masks The higher limit of PSD used by upward signal is sent, therefore, interference user terminal sends upward signal on the first subcarrier and used PSD when meeting the first PSD masks less than or equal to first subcarrier, also to meet the less than or equal to first subcarrier Two PSD masks.That is, interference user terminal is total to according to the first PSD masks of the first subcarrier and the 2nd PSD masks of the first subcarrier It is same to determine the PSD used by first subcarrier sends upward signal.

In the above-described embodiments, disturb user terminal some first subcarrier send upward signal used by PSD also by To the influence of the 3rd PSD masks of first subcarrier, wherein, the 3rd PSD masks of the first subcarrier represent interference user terminal Up direction initially limits in the highest PSD that Initial Channel Assignment discovery phase uses.It is, first according to the first subcarrier 3rd PSD masks of PSD masks, the 2nd PSD masks of the first subcarrier and the first subcarrier determine to disturb user terminal to exist jointly First subcarrier sends PSD used by upward signal.

Specifically, it can determine that the first subcarrier sends PSD used by upward signal according to equation below, by the first son PSD is represented with CDPSDus (f) used by carrier wave sends upward signal.

First PSD masks represent that the 2nd PSD masks are represented with PSDMASKus with OPBOMASKus, and the 3rd PSD masks are used CDMAXMASKus represents that CDPSDus (f) is determined by minimum value in OPBOMASKus, PSDMASKus and CDMAXMASKus, such as Shown in lower：

Disturb user terminal according to the scope of overlaid frequency obtain the first PSD masks mode, including but not limited to following two Kind mode：

First way is：Interference user terminal is made an uproar according to disturbed user terminal in the reference that the first subcarrier down direction receives The power spectral density of sound and the intensity of near-end crosstalk channel, obtain the first PSD masks of the first subcarrier.

The second way is：User terminal is disturbed according to descending in the first subcarrier with the central office side that disturbed user terminal is connected The power spectral density of reference noise and the intensity of near-end crosstalk channel that direction is sent, the first PSD for obtaining the first subcarrier are covered Mould.

The difference of first way and the second way is that the power spectral density for the reference noise that first way is related to is Refer to the power spectral density for the reference noise that disturbed user terminal receives in the first subcarrier down direction, and what the second way was related to With reference to the power spectrum for the reference noise for referring to send in the first subcarrier down direction with the central office side that disturbed user terminal is connected Density.

For first way, it is divided into following scenes 1 and scene 2, scene 1 is as shown in Fig. 2 Fig. 2 sends out for signal of the present invention The first application scenarios schematic diagram of the method sent；The circuit electrical equipment length of user terminal and the line of disturbed user terminal are disturbed in scene 1 Road electrical equipment equal length, in Fig. 2 above VTU-O to VTU-R above be disturbed user terminal circuit electrical equipment length, below VTU-O to VTU-R above is the circuit electrical equipment length for disturbing user terminal, and specifically, interference user terminal is according to disturbed user terminal In the power spectral density of reference noise and the intensity of near-end crosstalk channel that the first subcarrier down direction receives, the first son is obtained First PSD masks of carrier wave,

According to formula：

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next, f) and-Δ+3.5 [dBm/Hz]

The first PSD masks of above-mentioned first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFRXNPSD_ds(f) work(for the reference noise that disturbed user terminal receives in above-mentioned first subcarrier down direction is represented Rate spectrum density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f)= 10log₁₀(K_next·f^3/2), K_nextThe coefficient of coup of near-end crosstalk is represented, Δ represents that control near-end crosstalk influences the fine setting of size The factor, default value 0.

It should be noted that K_nextCan also user it is self-defined according to the actual NEXT crosstalk strengths of cable.

Scene 2 refers to that the circuit electrical length for the circuit electrical length and disturbed user terminal for disturbing user terminal is unequal, including Two kinds of situations of Fig. 3 a and Fig. 3 b, as shown in Figure 3 a and Figure 3 b shows, Fig. 3 a are that the method application scenarios 2 that signal of the present invention is sent are illustrated Figure, Fig. 3 b are another schematic diagram for the method application scenarios 2 that signal of the present invention is sent, in Fig. 3 a above VTU-O to above VTU-R is the circuit electrical equipment length of disturbed user terminal, and VTU-O to VTU-R above below is the line electricity for disturbing user terminal Device length, in Fig. 3 b above VTU-O to VTU-R above be disturbed user terminal circuit electrical equipment length, VTU-O below arrives VTU-R above is the circuit electrical equipment length for disturbing user terminal, obtains the first PSD of the first subcarrier mode below, for Fig. 3 a scene and Fig. 3 b scene are all suitable for.

Specifically, according to formula

The first PSD masks of above-mentioned first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFRXNPSD_ds(f) work(for the reference noise that disturbed user terminal receives in above-mentioned first subcarrier down direction is represented Rate spectrum density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f)= 10log₁₀(K_next·f^3/2), K_nextThe coefficient of coup of expression near-end crosstalk, LOSS (| kl₀-kl_{0, REF}|, f) near-end crosstalk channel Decay,kl₀Represent the circuit electrical equipment length of interference user terminal, kl_{0, REF} The circuit electrical equipment length with reference to disturbed user terminal is represented, the above-mentioned electrical equipment length with reference to disturbed user terminal is at least one disturbed use The equivalent electrical equipment length of the electrical equipment length at family end, specifically, the electrical equipment length with reference to disturbed user terminal can be multiple disturbed use The minimum value of the electrical equipment length at family end, or, the average value of the electrical equipment length of multiple disturbed user terminals, or, rule of thumb refer to The electrical equipment length of one of them of fixed multiple disturbed user terminals；Δ represents that control near-end crosstalk influences the fine setting factor of size, Default value is 0.It should be noted that K_nextCan also user it is self-defined according to the actual NEXT crosstalk strengths of cable.

In the scene shown in Fig. 2 or Fig. 3 a or Fig. 3 b, REFRXNPSD_ds(f) can be obtained by following three kinds of modes：

1st, the experience estimation technique, in the power of central office side configuration reference noise by the way of similar receiving terminal virtual noise Spectrum density, wherein, the power spectral density for the reference noise that disturbed user terminal receives typically is made up of three parts, and transmitter is made an uproar The noise of white Gaussian noise, receiver on sound, circuit, the wherein noise of transmitter and the noise of receiver are determined by analog device Fixed, it can be obtained by laboratory test, white Gaussian noise is commonly -140dBm/Hz on circuit.

2nd, Parameter Estimation Method, central office side obtain SNR (f), and Hlog (f), TXPSD (f), being calculated according to following equation can ：

REFRXNPSD (f)=H log (f)+TXPSD (f)-SNR (f)；

Wherein, SNR (f) represents signal to noise ratio, and Hlog (f) represents direct channels decay, and TXPSD (f) represents the power sent Spectrum density.

3rd, silent noise measuring method, uniformly extracts N number of first subcarrier in overlapping frequency range, and disturbed user terminal obtains The power spectral density for the reference noise that down direction receives when above-mentioned N number of first subcarrier does not send signal, by down direction The power spectral density of the reference noise of reception feeds back to central office side, and central office side is not sent according to above-mentioned N number of first subcarrier The statistical law of the power spectral density for the reference noise that down direction receives estimates disturbed user terminal in overlaid frequency model during signal The power spectral density for the reference noise that each first subcarrier down direction in enclosing receives, central office side carry each first son The power spectral density for the reference noise that ripple down direction receives is sent to interference user terminal；In order to ensure measurement effect, with During multipair line, multipair line does not send signal in above-mentioned N number of first subcarrier.

Interference user terminal is sent according to above-mentioned with the central office side that disturbed user terminal is connected in the first subcarrier down direction The power spectral density of reference noise and the intensity of near-end crosstalk channel, obtain the first PSD masks of above-mentioned first subcarrier, pin To two kinds of scenes of Fig. 3 a and Fig. 3 b, specifically,

Specifically, in the scene shown in Fig. 3 a, that is, the circuit electrical equipment length of user terminal is disturbed to be less than or equal to disturbed family end Circuit electrical equipment length, according to formula：

The first PSD masks of above-mentioned first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFTXNPSD_ds(f) represent what is sent with the central office side that disturbed user terminal is connected in the first subcarrier down direction The power spectral density of reference noise, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (kl₀, f) and represent interference user Direct channels decay,Wherein, kl₀The circuit electrical equipment length of interference user terminal is represented, Δ represents Near-end crosstalk is controlled to influence the fine setting factor of size, default value 0.

In the scene shown in Fig. 3 b, that is, the circuit electrical equipment length of user terminal is disturbed to be more than or equal to the line electricity at disturbed family end Device length, according to formula：

The first PSD masks of the first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFTXNPSD_ds(f) represent what is sent with the central office side that disturbed user terminal is connected in the first subcarrier down direction The power spectral density of reference noise, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (2kl_{0, REF}-kl₀, f) represent The direct channels decay of user is disturbed, kl₀Represent the circuit electrical equipment length of interference user terminal, kl_{0, REF}Represent the circuit electrical equipment length with reference to disturbed user terminal, above-mentioned ginseng The electrical equipment length for examining disturbed user terminal is the equivalent electrical equipment length of the electrical equipment length of at least one disturbed user terminal, specifically, ginseng The electrical equipment length for examining disturbed user terminal can be the minimum value of the electrical equipment length of multiple disturbed user terminals, or, multiple disturbed use The average value of the electrical equipment length at family end, or, the electrical equipment length of one of them of the multiple disturbed user terminals rule of thumb specified； Δ represents that control near-end crosstalk influences the fine setting factor of size, default value 0.

In the above-described embodiments, REFRXNPSD_ds(f) can be obtained using the following two kinds mode：

1st, the experience estimation technique, configured using similar transmitting terminal virtual noise (Virtual Noise) mode in central office side The power spectral density of reference noise；

2nd, Parameter Estimation Method, central office side obtain SNR (f), TXPSD (f), can be calculated according to following equation：

REFTXNPSD (f)=TXPSD (f)-SNR (f)

Fig. 4 is the structural representation for the device embodiment one that signal of the present invention is sent, and the device of the present embodiment includes receiving Module 401, acquisition module 402 and processing module 403, wherein, receiving module 401 is used for the back-off ginseng that central office side is sent Number, above-mentioned power back-off parameters include the scope of overlaid frequency, and the scope of above-mentioned overlaid frequency refers to above-mentioned interference user terminal The upstream frequency scope overlapping with the downstream frequency of disturbed user terminal；Acquisition module 402 is used for according to above-mentioned overlaid frequency Scope obtains the first power spectral density PSD mask of the first subcarrier, and above-mentioned first PSD masks are used to limit above-mentioned interference user The maximum of the PSD used by above-mentioned first subcarrier sends upward signal is held, above-mentioned first subcarrier is above-mentioned overlapping frequency Any subcarrier in the range of rate；Processing module 403 is used to be determined according to the first PSD masks of above-mentioned first subcarrier State the first subcarrier and send PSD used by upward signal, it is above-mentioned used by above-mentioned first subcarrier sends upward signal PSD is less than or equal to the first PSD masks of above-mentioned first subcarrier.

In the above-described embodiments, the 2nd PSD masks of above-mentioned first subcarrier are also included in above-mentioned power back-off parameters, on Office indicates above-mentioned interference user terminal used by above-mentioned first subcarrier sends upward signal centered on stating the 2nd PSD masks PSD higher limit；Above-mentioned processing module 403 is specifically used for the first PSD masks and above-mentioned first according to above-mentioned first subcarrier 2nd PSD masks of subcarrier determine the PSD used by above-mentioned first subcarrier sends upward signal, wherein, it is above-mentioned upper State the first subcarrier send upward signal used by PSD be less than or equal to above-mentioned first subcarrier the 2nd PSD masks.

In the above-described embodiments, above-mentioned acquisition module 402 is specifically used for according to above-mentioned disturbed user terminal in the above-mentioned first son The power spectral density of reference noise and the intensity of near-end crosstalk channel that carrier wave down direction receives, obtain above-mentioned first subcarrier The first PSD masks.

In the above-described embodiments, when the circuit electrical equipment length of above-mentioned interference user terminal and the line electricity of above-mentioned disturbed user terminal During device equal length,

Above-mentioned acquisition module 402 is specifically used for according to formula：

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next, f) and-Δ+3.5 [dBm/Hz]

The first PSD masks of above-mentioned first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFRXNPSD_ds(f) work(for the reference noise that disturbed user terminal receives in above-mentioned first subcarrier down direction is represented Rate spectrum density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f)= 10log₁₀(K_next·f^3/2), K_nextThe coefficient of coup of near-end crosstalk is represented, Δ represents that control near-end crosstalk influences the fine setting of size The factor.

In the above-described embodiments, when the circuit electrical equipment length of above-mentioned interference user terminal and the line electricity of above-mentioned disturbed user terminal When device length is unequal,

Above-mentioned acquisition module 402 is specifically used for according to formula

The first PSD masks of above-mentioned first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFRXNPSD_ds(f) work(for the reference noise that disturbed user terminal receives in above-mentioned first subcarrier down direction is represented Rate spectrum density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f)= 10log₁₀(K_next·f^3/2), K_nextThe coefficient of coup of expression near-end crosstalk, LOSS (| kl₀-kl_{0, REF}|, f) near-end crosstalk channel Decay,kl₀Represent the circuit electrical equipment length of interference user terminal, kl_{0, REF} The circuit electrical equipment length with reference to disturbed user terminal is represented, the above-mentioned electrical equipment length with reference to disturbed user terminal is at least one disturbed use The equivalent electrical equipment length of the electrical equipment length at family end, Δ represent that control near-end crosstalk influences the fine setting factor of size.

In the above-described embodiments, above-mentioned acquisition module 402 is specifically used for according to the central office side being connected with disturbed user terminal In the power spectral density of reference noise and the intensity of near-end crosstalk channel that the first subcarrier down direction is sent, acquisition State the first PSD masks of the first subcarrier.

In the above-described embodiments, when the circuit electrical equipment length of above-mentioned interference user terminal is less than or equal to above-mentioned disturbed user terminal During circuit electrical equipment length,

The first PSD masks of above-mentioned first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFTXNPSD_ds(f) represent to send out in above-mentioned first subcarrier down direction with the central office side that disturbed user terminal is connected The power spectral density of the reference noise sent, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel(K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (kl₀, f) The direct channels decay of interference user is represented,Wherein, kl₀Represent the line electricity of interference user terminal Device length, Δ represent that control near-end crosstalk influences the fine setting factor of size.

In the above-described embodiments, when the circuit electrical equipment length of above-mentioned interference user terminal is more than or equal to above-mentioned disturbed user terminal During circuit electrical equipment length,

The first PSD masks of above-mentioned first subcarrier are obtained,

Wherein, above-mentioned OPBOMASK (f) represents the first PSD masks of above-mentioned first subcarrier, and f represents that above-mentioned first son carries Ripple, above-mentioned REFTXNPSD_ds(f) represent to send out in above-mentioned first subcarrier down direction with the central office side that disturbed user terminal is connected The power spectral density of the reference noise sent, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel(K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (2kl_{0, REF}-kl₀, f) and represent that the direct channels of interference user decay,kl₀Represent the line of interference user terminal Road electrical equipment length, kl_{0, REF}Represent the circuit electrical equipment length with reference to disturbed user terminal, the above-mentioned electrical equipment length with reference to disturbed user terminal It is the equivalent electrical equipment length of the electrical equipment length of at least one disturbed user terminal, Δ represents that control near-end crosstalk influences the fine setting of size The factor.

In the above-described embodiments, above-mentioned processing module 403 is specifically used for being covered according to the first PSD of above-mentioned first subcarrier 3rd PSD masks of mould, the 2nd PSD masks of above-mentioned first subcarrier and above-mentioned first subcarrier determine to carry in the above-mentioned first son Ripple sends PSD used by upward signal, wherein, the above-mentioned PSD used by above-mentioned first subcarrier sends upward signal is small In the 3rd PSD masks equal to above-mentioned first subcarrier, the 3rd PSD masks of above-mentioned first subcarrier are represented on interference user terminal Line direction initially limits in the highest PSD that Initial Channel Assignment discovery phase uses.

In the above-described embodiments, above-mentioned receiving module 401 is specifically used for passing through the above-mentioned power of O-SIGNATURE message sinks Back-off parameter.

Said apparatus embodiment, it accordingly can be used for the technical scheme for performing embodiment of the method shown in Fig. 1, its realization principle Similar with technique effect, here is omitted.

Fig. 5 is the structural representation for the device embodiment two that signal of the present invention is sent, as shown in figure 5, the dress of the present embodiment Put including memory 501 and processor 502, wherein, above-mentioned memory 501 is used to store the generation for performing the method that signal is sent Code；Above-mentioned processor 502 is used to call above-mentioned code, performs following operation：

The power back-off parameters that central office side is sent are received, above-mentioned power back-off parameters include the scope of overlaid frequency, The scope of above-mentioned overlaid frequency refers to the upstream frequency of the above-mentioned interference user terminal model overlapping with the downstream frequency of disturbed user terminal Enclose；The first power spectral density PSD mask of the first subcarrier is obtained according to the scope of above-mentioned overlaid frequency, above-mentioned first PSD is covered Mould is used for the maximum for limiting above-mentioned interference user terminal PSD used by above-mentioned first subcarrier sends upward signal, above-mentioned First subcarrier is any subcarrier in the range of above-mentioned overlaid frequency；According to the first PSD masks of above-mentioned first subcarrier It is determined that the PSD used by above-mentioned first subcarrier sends upward signal, above-mentioned to send upward signal in above-mentioned first subcarrier Used PSD is less than or equal to the first PSD masks of above-mentioned first subcarrier.

The present invention also provides a kind of signal sending system embodiment, as shown in Fig. 2, Fig. 3 a and Fig. 3 b, including：At least two Subscribers' line (Fig. 2, Fig. 3 a and Fig. 3 b are only shown with two), one end of every above-mentioned subscribers' line is connected with central office side, separately One end is connected with user terminal, and above-mentioned user terminal is disturbed user terminal or interference user terminal；Above-mentioned interference user terminal is Fig. 4 or figure Sender unit shown in 5, it is possible to achieve the function of the sender unit shown in Fig. 4 or Fig. 5.

In fig. 2, local side centered on subscribers' line left end connection above, right-hand member connection for disturbed user terminal, under Face subscribers' line left end connection centered on local side, right-hand member connection for disturb user terminal；In fig. 3 a, user's line above Local side centered on the connection of road left end, right-hand member connection for disturbed user terminal, centered on subscribers' line left end connection below Local side, right-hand member connection for disturb user terminal；In fig 3b, local side centered on subscribers' line left end connection above, right-hand member Connection for disturbed user terminal, local side centered on subscribers' line left end connection below, right-hand member connection to disturb user terminal.

It should be noted that the technical scheme of the above embodiment of the present invention is applicable not only to digital subscriber line telephone network Cross-talk cancellation, be also applied for other utilize telephone line network, on the other hand, the present invention be not restricted.

One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to The related hardware of programmed instruction is crossed to complete.Foregoing program can be stored in a computer read/write memory medium.The journey Sequence upon execution, execution the step of including above-mentioned each method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or Person's CD etc. is various can be with the medium of store program codes.

Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology The scope of scheme.

Claims

1. a kind of method that signal is sent, it is characterised in that including：

User terminal is disturbed to receive the power back-off parameters that central office side is sent, the power back-off parameters include overlaid frequency Scope, the scope of the overlaid frequency refer to that the upstream frequency of the interference user terminal is overlapping with the downstream frequency of disturbed user terminal Scope；

The first power spectral density PSD that the interference user terminal obtains the first subcarrier according to the scope of the overlaid frequency is covered Mould, the first PSD masks are used to limit the interference user terminal used by first subcarrier sends upward signal PSD maximum, first subcarrier are any subcarrier in the range of the overlaid frequency；

The interference user terminal determines up in first subcarrier transmission according to the first PSD masks of first subcarrier PSD used by signal, the PSD used by first subcarrier sends upward signal are less than or equal to the described first son First PSD masks of carrier wave；

The interference user terminal obtains the first PSD masks of the first subcarrier according to the scope of the overlaid frequency, including：

The reference noise that the interference user terminal receives according to the disturbed user terminal in the first subcarrier down direction The intensity of power spectral density and near-end crosstalk channel, obtain the first PSD masks of first subcarrier.

2. according to the method for claim 1, it is characterised in that also include the described first son in the power back-off parameters and carry 2nd PSD masks of ripple, the local side instruction interference user terminal is sent out in first subcarrier centered on the 2nd PSD masks Send the higher limit of PSD used by upward signal；

The interference user terminal determines up in first subcarrier transmission according to the first PSD masks of first subcarrier PSD used by signal, including：

The interference user terminal is covered according to the first PSD masks of first subcarrier and the 2nd PSD of first subcarrier Mould determines the PSD used by first subcarrier sends upward signal, wherein, it is described in first subcarrier transmission PSD is less than or equal to the 2nd PSD masks of first subcarrier used by row signal.

3. according to the method for claim 1, it is characterised in that when the interference circuit electrical equipment length of user terminal and described During the circuit electrical equipment equal length of disturbed user terminal,

The reference noise that the interference user terminal receives according to the disturbed user terminal in the first subcarrier down direction The intensity of power spectral density and near-end crosstalk channel, the first PSD masks of first subcarrier are obtained, including：

According to formula

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next,f)-Δ+3.5[dBm/Hz]

The first PSD masks of first subcarrier are obtained,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents first subcarrier, The REFRXNPSD_ds(f) power spectrum for the reference noise that disturbed user terminal receives in the first subcarrier down direction is represented Density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f) and=10log₁₀ (K_next·f^3/2), K_nextThe coefficient of coup of near-end crosstalk is represented, Δ represents that control near-end crosstalk influences the fine setting factor of size.

4. according to the method for claim 1, it is characterised in that when the interference circuit electrical equipment length of user terminal and described When the circuit electrical equipment length of disturbed user terminal is unequal,

According to formula

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next,f)+LOSS(|kl₀-kl_0,REF|,f)-Δ+3.5 [dBm/Hz]

The first PSD masks of first subcarrier are obtained,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents first subcarrier, The REFRXNPSD_ds(f) power spectrum for the reference noise that disturbed user terminal receives in the first subcarrier down direction is represented Density, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel (K_next, f) and=10log₁₀ (K_next·f^3/2), K_nextThe coefficient of coup of expression near-end crosstalk, LOSS (| kl₀-kl_0,REF|, f) represent that near-end crosstalk channel declines Subtract,kl₀Represent the circuit electrical equipment length of interference user terminal, kl_0,REFTable Show the circuit electrical equipment length with reference to disturbed user terminal, the electrical equipment length with reference to disturbed user terminal is at least one disturbed user The equivalent electrical equipment length of the electrical equipment length at end, Δ represent that control near-end crosstalk influences the fine setting factor of size.

5. method according to claim 1 or 2, it is characterised in that the interference user terminal is according to the overlaid frequency Scope obtains the first power spectral density PSD mask of the first subcarrier, including：

It is described interference user terminal according to the central office side that the disturbed user terminal is connected in the first subcarrier down direction The power spectral density of the reference noise of transmission and the intensity of near-end crosstalk channel, the first PSD for obtaining first subcarrier are covered Mould.

6. according to the method for claim 5, it is characterised in that when it is described interference user terminal circuit electrical equipment length be less than etc. When the circuit electrical equipment length of the disturbed user terminal,

It is described interference user terminal according to the central office side that the disturbed user terminal is connected in the first subcarrier down direction The power spectral density of the reference noise of transmission and the intensity of near-end crosstalk channel, the first PSD for obtaining first subcarrier are covered Mould, including：

According to formula：

OPBOMASK (f)=REFTXNPSD_ds(f)-NEXTChannel(K_next,f)+LOSS(kl₀,f)-Δ+3.5[dBm/Hz]

The first PSD masks of first subcarrier are obtained,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents first subcarrier, The REFTXNPSD_ds(f) represent to send out in the first subcarrier down direction with the central office side that the disturbed user terminal is connected The power spectral density of the reference noise sent, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel(K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (kl₀,f) The direct channels decay of interference user is represented,Wherein, kl₀Represent the line electricity of interference user terminal Device length, Δ represent that control near-end crosstalk influences the fine setting factor of size.

7. according to the method for claim 5, it is characterised in that when it is described interference user terminal circuit electrical equipment length be more than etc. When the circuit electrical equipment length of the disturbed user terminal,

The interference user terminal is according to described descending in first subcarrier with the central office side that the disturbed user terminal is connected The power spectral density of reference noise and the intensity of near-end crosstalk channel that direction is sent, obtain the first of first subcarrier PSD masks, including：

According to formula：

OPBOMASK (f)=REFTXNPSD_ds(f)-NEXTChannel(K_next,f)+LOSS(2kl_0,REF-kl₀,f)-Δ+3.5 [dBm/Hz] obtains the first PSD masks of first subcarrier,

Wherein, the OPBOMASK (f) represents the first PSD masks of first subcarrier, and f represents first subcarrier, The REFTXNPSD_ds(f) represent to send out in the first subcarrier down direction with the central office side that the disturbed user terminal is connected The power spectral density of the reference noise sent, NEXTChannel (K_next, f) represent near-end crosstalk channel intensity, NEXTChannel(K_next, f) and=10log₁₀(K_next·f^3/2), K_nextRepresent the coefficient of coup of near-end crosstalk, LOSS (2kl_0,REF-kl₀, f) and represent that the direct channels of interference user decay, kl₀Represent the circuit electrical equipment length of interference user terminal, kl_0,REFRepresent the circuit electrical equipment length with reference to disturbed user terminal, the ginseng The electrical equipment length for examining disturbed user terminal is the equivalent electrical equipment length of the electrical equipment length of at least one disturbed user terminal, and Δ represents control Near-end crosstalk influences the fine setting factor of size.

8. according to the method described in any one of claim 2,3,4,6,7, it is characterised in that the interference user terminal is according to First PSD masks of the first subcarrier and the 2nd PSD masks of first subcarrier determine to send in first subcarrier PSD used by upward signal, including：

The interference user terminal is according to the first PSD masks of first subcarrier, the 2nd PSD masks of first subcarrier The PSD used by first subcarrier sends upward signal is determined with the 3rd PSD masks of first subcarrier, its In, the PSD used by first subcarrier sends upward signal is less than or equal to the 3rd PSD of first subcarrier Mask, the 3rd PSD masks of first subcarrier represent that interference user terminal up direction makes in Initial Channel Assignment discovery phase Highest PSD is initially limited.

9. according to the method for claim 5, it is characterised in that the interference user terminal is according to the of first subcarrier 2nd PSD masks of one PSD masks and first subcarrier determine that sending upward signal in first subcarrier is used PSD, including：

10. according to the method described in any one of claim 1,2,3,4,6,7,9, it is characterised in that the interference user termination The power back-off parameters that central office side is sent are received, including：

11. according to the method for claim 5, it is characterised in that the interference user terminal receives the work(that central office side is sent Rate back-off parameter, including：

12. according to the method for claim 8, it is characterised in that the interference user terminal receives the work(that central office side is sent Rate back-off parameter, including：

A kind of 13. device that signal is sent, it is characterised in that including：

Receiving module, the power back-off parameters sent for central office side, the power back-off parameters include overlaid frequency Scope, the scope of the overlaid frequency refer to the model for disturbing the upstream frequency of user terminal overlapping with the downstream frequency of disturbed user terminal Enclose；

Acquisition module, for obtaining the first power spectral density PSD mask of the first subcarrier according to the scope of the overlaid frequency, The first PSD masks are used to limit interference user terminal PSD used by first subcarrier sends upward signal Maximum, first subcarrier be the overlaid frequency in the range of any subcarrier；

Processing module, it is up in first subcarrier transmission for being determined according to the first PSD masks of first subcarrier PSD used by signal, the PSD used by first subcarrier sends upward signal are less than or equal to the described first son First PSD masks of carrier wave；

The acquisition module is specifically used for the reference received according to the disturbed user terminal in the first subcarrier down direction The power spectral density of noise and the intensity of near-end crosstalk channel, obtain the first PSD masks of first subcarrier.

14. device according to claim 13, it is characterised in that also include the described first son in the power back-off parameters 2nd PSD masks of carrier wave, the local side instruction interference user terminal is in first subcarrier centered on the 2nd PSD masks PSD higher limit used by transmission upward signal；

The processing module is specifically for the first PSD masks and the second of first subcarrier according to first subcarrier PSD masks determine the PSD used by first subcarrier sends upward signal, wherein, it is described in first subcarrier PSD is less than or equal to the 2nd PSD masks of first subcarrier used by transmission upward signal.

15. device according to claim 13, it is characterised in that circuit electrical equipment length and institute when the interference user terminal When stating the circuit electrical equipment equal length of disturbed user terminal,

The acquisition module is specifically used for according to formula：

OPBOMASK (f)=REFRXNPSD_ds(f)-NEXTChannel(K_next,f)-Δ+3.5[dBm/Hz]

The first PSD masks of first subcarrier are obtained,

16. device according to claim 13, it is characterised in that circuit electrical equipment length and institute when the interference user terminal State disturbed user terminal circuit electrical equipment length it is unequal when,

The acquisition module is specifically used for according to formula

The first PSD masks of first subcarrier are obtained,

17. the device according to claim 13 or 14, it is characterised in that the acquisition module be specifically used for according to it is described The power spectral density for the reference noise that the central office side of disturbed user terminal connection is sent in the first subcarrier down direction with The intensity of near-end crosstalk channel, obtain the first PSD masks of first subcarrier.

18. device according to claim 17, it is characterised in that when the circuit electrical equipment length of the interference user terminal is less than Equal to the disturbed user terminal circuit electrical equipment length when,

The acquisition module is specifically used for according to formula：

OPBOMASK (f)=REFTXNPSD_ds(f)-NEXTChannel(K_next,f)+LOSS(kl₀,f)-Δ+3.5[dBm/Hz]

The first PSD masks of first subcarrier are obtained,

19. device according to claim 17, it is characterised in that when the circuit electrical equipment length of the interference user terminal is more than Equal to the disturbed user terminal circuit electrical equipment length when,

The acquisition module is specifically used for according to formula：

OPBOMASK (f)=REFTXNPSD_ds(f)-NEXTChannel(K_next,f)+LOSS(2kl_0,REF-kl₀,f)-Δ+3.5 [dBm/Hz]

The first PSD masks of first subcarrier are obtained,

20. according to the device described in any one of claim 14,15,16,19, it is characterised in that the processing module is specifically used In the first PSD masks, the 2nd PSD masks of first subcarrier and first subcarrier according to first subcarrier The 3rd PSD masks determine first subcarrier send upward signal used by PSD, wherein, it is described described first PSD is less than or equal to the 3rd PSD masks of first subcarrier, the first son load used by subcarrier sends upward signal 3rd PSD masks of ripple represent that interference user terminal up direction initially limits in the highest PSD that Initial Channel Assignment discovery phase uses System.

21. device according to claim 17, it is characterised in that the processing module is specifically used for according to the described first son 3rd PSD masks of the first PSD masks of carrier wave, the 2nd PSD masks of first subcarrier and first subcarrier are true It is scheduled on first subcarrier and sends PSD used by upward signal, wherein, it is described to send up letter in first subcarrier PSD is less than or equal to the 3rd PSD masks of first subcarrier, the 3rd PSD masks of first subcarrier used by number Represent that interference user terminal up direction initially limits in the highest PSD that Initial Channel Assignment discovery phase uses.

22. according to the device described in any one of claim 13,14,15,16,18,19, it is characterised in that the receiving module Specifically for passing through power back-off parameters described in O-SIGNATURE message sinks.

23. device according to claim 17, it is characterised in that the receiving module is specifically used for passing through O- Power back-off parameters described in SIGNATURE message sinks.

24. device according to claim 20, it is characterised in that the receiving module is specifically used for passing through O- Power back-off parameters described in SIGNATURE message sinks.

A kind of 25. device that signal is sent, it is characterised in that including：

Memory and processor, the memory are used to store the code for performing the method that signal is sent；The processor is used for The code is called, performs following operation：

The power back-off parameters that central office side is sent are received, the power back-off parameters include the scope of overlaid frequency, described The scope of overlaid frequency refers to the scope for disturbing the upstream frequency of user terminal overlapping with the downstream frequency of disturbed user terminal；According to institute The scope for stating overlaid frequency obtains the first power spectral density PSD mask of the first subcarrier, and the first PSD masks are used to limit Interference user terminal PSD used by first subcarrier sends upward signal maximum, first subcarrier For any subcarrier in the range of the overlaid frequency；Determined according to the first PSD masks of first subcarrier described First subcarrier sends PSD used by upward signal, the PSD used by first subcarrier sends upward signal Less than or equal to the first PSD masks of first subcarrier；

A kind of 26. signal sending system, it is characterised in that including：

At least two subscribers' lines, one end of every subscribers' line are connected with central office side, and the other end is connected with user terminal, The user terminal is disturbed user terminal or interference user terminal；

The interference user terminal is the sender unit as described in any one of claim 13~24.