WO2016197324A1

WO2016197324A1 - Signal processing method, apparatus and system

Info

Publication number: WO2016197324A1
Application number: PCT/CN2015/081071
Authority: WO
Inventors: 孙方林; 王祥; 涂建平
Original assignee: 华为技术有限公司
Priority date: 2015-06-09
Filing date: 2015-06-09
Publication date: 2016-12-15
Also published as: CN107113126B; CN107113126A

Abstract

Provided is a signal processing method, comprising: dividing a frequency band for sending a downlink synchronization symbol into at least two parts of non-overlapping frequency bands, the two parts of frequency bands being a first frequency band and a second frequency band; allocating frequency points on the first frequency band and the second frequency band to a sounding sub-carrier and a markup sub-carrier, so that the sounding sub-carrier and the markup sub-carrier distributed on the second frequency band are respectively symmetric with the sounding sub-carrier and the markup sub-carrier distributed on the first frequency band based on a symmetry point, the symmetry point being the lowest frequency point of the second frequency band, the highest frequency point of the first frequency band or one frequency point between the lowest frequency point of the second frequency band and the highest frequency point of the first frequency band; and modulating a downlink pilot frequency sequence onto the sounding sub-carrier on the first frequency band and the second frequency band and then sending same to an opposite-end device. Also provided are a signal processing apparatus and a network system.

Description

Signal processing method, device and system

Technical field

The present invention relates to the field of data communications, and in particular to a signal processing method, apparatus and system.

Background technique

Digital Subscriber Line (DSL) technology is a high-speed data transmission technology for transmission over twisted pair lines, such as Unshielded Twist Pair (UTP). DSL technologies include Asymmetrical Digital Subscriber Line (ADSL), Very-high-bit-rate Digital Subscriber Line (VDSL), and Very High-Speed Digital Subscriber Line 2 (Very-high-bit- Rate Digital Subscriber Line 2, VDSL2) and Single-pair High-bit-rate Digital Subscriber Line (SHDSL). A device that provides multiple DSL access for Customer Premises Equipment (CPE) is called a DSL Access Multiplexer (DSLAM). The system connection relationship is shown in Figure 1.

At present, the industry has also begun the definition and technical discussion of the next-generation VDSL, which will extend the spectrum of VDSL2 up to 17.664MHz to more than 30MHz, and the high spectrum will naturally lead to high crosstalk on the line, and crosstalk in the high frequency band is also It cannot be eliminated directly by the crosstalk elimination method of VDSL2, which will seriously affect the signal transmission on the line.

Summary of the invention

The embodiment of the invention provides a signal processing method, device and system, which are implemented.

In a first aspect, an embodiment of the present invention provides a signal processing method, where the method includes

The network side device divides the frequency band used for transmitting the downlink synchronization symbol into at least two parts that do not overlap. a frequency band, wherein the two frequency bands are a first frequency band and a second frequency band; wherein a lowest frequency point of the second frequency band is higher than a highest frequency point of the first frequency band;

Allocating frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, so that the sounding subcarriers and the labeled subcarriers distributed on the second frequency band are respectively distributed with the detectors distributed on the first frequency band The carrier and the labeled subcarrier are symmetric based on a symmetric point; the symmetric point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band, or a lowest frequency point of the second frequency band, and the first a frequency point between the highest frequency points of a frequency band;

The network side device modulates the downlink pilot sequence to the probe subcarriers on the first frequency band and the second frequency band, and then sends the downlink pilot sequence to the peer device.

In a first possible implementation manner of the first aspect, the allocating the frequency points on the first frequency band and the second frequency band to the detecting subcarriers and marking the subcarriers specifically includes: performing the first frequency band according to the comb structure The frequency points are alternately allocated to the detecting subcarriers and the labeled subcarriers, and the frequency points on the second frequency band are alternately allocated to the detecting subcarriers and the labeled subcarriers.

In combination with the first aspect or the first aspect of the first aspect, in a second possible implementation manner, the sounding subcarriers on the second frequency band and the sounding subcarriers on the first frequency band are different from each other.

With reference to the first aspect or the first aspect of the first aspect, in a third possible implementation manner, the frequency band used by the network device to send the downlink synchronization symbol is used to send the downlink synchronization symbol in the DSL mode of two different spectrums. The combination of the frequency bands; the highest frequency point of the first frequency band is not higher than the highest frequency point of the overlapping frequency band for transmitting the downlink synchronization symbol in the DSL mode of the two different spectrums.

In a fourth possible implementation manner of the first aspect, the network side device modulates a downlink pilot sequence to the sounding subcarriers and the labeled subcarriers on the first frequency band and the second frequency band in an initialization phase; A downlink pilot sequence is modulated onto the sounding subcarriers on the first and second frequency bands during a data transmission phase.

In combination with the first aspect, the first aspect of the first aspect, the second of the first aspect, the third of the first aspect, or the fourth of the first aspect, in a fifth possible implementation manner, the symmetry Point is in design Fixedly set in the standby, or determined by interactive negotiation with the peer device during the handshake phase or initialization phase.

With reference to the first aspect, the first aspect of the first aspect, the second aspect of the first aspect, the third aspect of the first aspect, or the fourth aspect of the first aspect, in a sixth possible implementation manner, the method The network side device receives the signal fed back by the peer device, and the signal fed back by the peer device reflects that the peer device receives the detected subcarriers on the first frequency band and the second frequency band. The signal to.

In a sixth possible implementation manner of the first aspect, the signal that is sent back by the peer device is an error sample of the signal received by the peer device on the detecting subcarriers in the first frequency band and the second frequency band. a signal, or a signal obtained by frequency domain conversion of a received signal on the detected subcarriers on the first frequency band and the second frequency band.

In a second aspect, an embodiment of the present invention provides a signal processing method, where the method includes

The user side device divides the frequency band used for transmitting the uplink synchronization symbol into at least two frequency bands that do not overlap, the two frequency bands are the first frequency band and the second frequency band; the lowest frequency point of the second frequency band is higher than the foregoing The highest frequency point of a frequency band;

The user side device modulates the uplink pilot sequence to the sounding subcarriers on the first frequency band and the second frequency band, and then sends the uplink pilot sequence to the peer device.

In a first possible implementation manner of the second aspect, the sounding subcarriers on the second frequency band and the sounding subcarriers on the first frequency band are different from each other.

With the second aspect or the first aspect of the second aspect, in a second possible implementation manner, the frequency band used by the user side device to send the uplink synchronization symbol is used to send uplink synchronization in the DSL mode of two different spectrums. The combination of the frequency bands of the symbol, the highest frequency point of the first frequency band is not higher than the highest frequency point of the overlapping frequency band for transmitting the uplink synchronization symbol in the DSL mode of the two different spectrums.

In a third possible implementation manner of the second aspect, the user side device modulates an uplink pilot sequence to the sounding subcarriers and the labeled subcarriers on the first frequency band and the second frequency band in an initialization phase; The uplink pilot sequence is modulated onto the sounding subcarriers on the first and second frequency bands during a data transmission phase.

With reference to the second aspect or the first aspect of the second aspect, in a fourth possible implementation manner, the symmetric point is fixedly set in the device, or is mutually negotiated with the peer device in a handshake phase or an initialization phase. After the determination.

In a third aspect, an embodiment of the present invention provides a network side device, where the network side device includes a spectrum division module and a signal sending module;

The spectrum division module divides a frequency band used for transmitting a downlink synchronization symbol into at least two frequency bands that do not overlap, the two frequency bands are a first frequency band and a second frequency band; and a lowest frequency point of the second frequency band is higher than The highest frequency point of the first frequency band; and the frequency points on the first frequency band and the second frequency band are allocated to the sounding subcarrier and the labeled subcarrier, so that the sounding subcarriers and the marker distributed on the second frequency band are The carrier is respectively symmetric with a detecting subcarrier and a labeled subcarrier distributed on the first frequency band based on a symmetric point; the symmetric point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band, or the a frequency point between the lowest frequency point of the second frequency band and the highest frequency point of the first frequency band;

The signal sending module is configured to: the network side device modulates the downlink pilot sequence to the detecting subcarriers on the first frequency band and the second frequency band, and then sends the downlink pilot sequence to the peer device.

In a first possible implementation manner of the third aspect, the sounding subcarriers on the second frequency band and the sounding subcarriers on the first frequency band are different from each other.

In combination with the third aspect or the first aspect of the third aspect, in a second possible implementation manner, The frequency band used for transmitting the downlink synchronization symbol is a combination of frequency bands for transmitting downlink synchronization symbols in the DSL mode of two different spectrums; the highest frequency point of the first frequency band is not higher than the DSL modes of the two different spectrums The highest frequency point of the overlapping frequency band of the downlink synchronization symbol is transmitted.

With reference to the third aspect, or the first aspect of the third aspect, in a third possible implementation manner, the spectrum division module allocates frequency points on the first frequency band and the second frequency band to the probe subcarrier and the labeled subcarrier. In addition, the spectrum division module alternately allocates frequency points on the first frequency band to the detection subcarriers and the labeled subcarriers according to the comb structure, and alternately allocates frequency points on the second frequency band to the detection subcarriers and the labeled subcarriers.

With reference to the second aspect of the third aspect, in a fourth possible implementation manner, the network side device further includes a signal receiving module, configured to receive a signal that is fed back by the peer device, where the signal reflects the peer end A signal received by the device on the sounding subcarriers on the first frequency band and the second frequency band.

With reference to the third aspect, the first aspect of the third aspect, the second aspect of the third aspect, the third aspect of the third aspect, or the fourth aspect of the third aspect, in a fifth possible implementation manner, the signal transmitting module And modulating a downlink pilot sequence to the sounding subcarriers and the labeled subcarriers on the first frequency band and the second frequency band in an initialization phase; and modulating the downlink pilot sequence to the first frequency band and the second in a data transmission phase On the probe subcarriers in the band.

In a sixth possible implementation manner of the third aspect, the network side device is a DSLAM device, the spectrum division module is a processing chip in a DSLAM device, and the signal sending module is a signal transmitter in a DSLAM.

In a fourth aspect, the embodiment of the present invention provides a user side device, where the user side device includes a spectrum division module and a signal sending module, and the spectrum dividing module divides the frequency band used for sending the uplink synchronization symbol into non-overlapping At least two frequency bands, the two frequency bands are a first frequency band and a second frequency band; a lowest frequency point of the second frequency band is higher than a highest frequency point of the first frequency band; and the first frequency band and the first frequency band The frequency points on the second frequency band are allocated to the sounding subcarriers and the labeled subcarriers, so that the sounding subcarriers and the labeled subcarriers distributed on the second frequency band are respectively distributed with the sounding subcarriers distributed on the first frequency band. And the labeled subcarrier is symmetric based on a symmetric point; the symmetric point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band or a lowest frequency point of the second frequency band, and the first a frequency point between the highest frequency points of the frequency band;

The signal sending module is configured to modulate the uplink pilot sequence to the detecting subcarriers on the first frequency band and the second frequency band, and then send the uplink pilot sequence to the opposite device.

In a first possible implementation manner of the fourth aspect, the frequency band used for transmitting the uplink synchronization symbol is a combination of frequency bands used for transmitting uplink synchronization symbols in two different spectrum DSL modes, The highest frequency point of the first frequency band is not higher than the highest frequency point of the overlapping frequency band for transmitting the uplink synchronization symbol in the DSL mode of the two different spectrums.

With reference to the fourth aspect, or the first aspect of the fourth aspect, in a second possible implementation manner, the signal sending module modulates an uplink pilot sequence to the first frequency band and the second frequency band in an initialization phase Subcarriers and labeled subcarriers; and modulating an uplink pilot sequence to the sounding subcarriers on the first and second frequency bands during a data transmission phase.

With reference to the fourth aspect, the first aspect of the fourth aspect, or the second aspect of the fourth aspect, in a third possible implementation manner, the user side device is a customer premises equipment (CPE), and the spectrum division module is A processing chip in the CPE, the signal transmitting module being a signal transmitter in the CPE.

According to a fifth aspect, an embodiment of the present invention provides a network system, including a network side device and a user side device, where the network side device and the user side device are connected by a twisted pair; the network side device is the network side device; Alternatively, the user side device is the user side device described above.

According to the solution in this embodiment, when the network side device accesses the DSL mode of two different spectrums, the overlapping frequency band is used as a part of the frequency band, and the non-overlapping frequency band is used as another part of the frequency band, and the two frequency bands are allocated. Subcarriers (including labeled subcarriers and sounding subcarriers), and ensure that subcarriers in the two frequency bands are symmetrically distributed based on a certain symmetric point, so that subcarriers in non-overlapping frequency bands can be guaranteed even in aliased or overlapping frequency bands. The subcarriers can be aligned with the original subcarrier position even after mirroring. And because the subcarriers are aligned, the crosstalk channel can be estimated normally for use. Crosstalk cancellation.

DRAWINGS

FIG. 1 is a schematic diagram of a connection relationship of a DSLAM system;

2 is a schematic flowchart diagram of a signal processing method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of frequency point allocation according to an embodiment of the present invention; FIG.

4 is a schematic flowchart diagram of another signal processing method according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a network side device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a user side device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a system according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of a general network component according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

To eliminate the crosstalk on the VDSL2 line, the transmit signal may be pre-compensated on the network side (the CO side) according to the crosstalk parameter fed back on the user side (ie, the CPE side). The technique is called Vectoring processing. The device for vectorization processing is a Vectoring Control Entity (VCE) in the DSLAM. The VCE modulates a specified downlink pilot sequence to a probe sub-stream of a downlink synchronization symbol in an initialization phase and a data transmission phase (Showtime phase). In addition to detecting subcarriers, there are also flag tones for transmitting pilot sequences.

The embodiment of the invention provides a signal processing method, as shown in FIG. 2, including

Step 201: The frequency band used by the network side device to send the downlink synchronization symbol is divided into at least two frequency bands that are not overlapped, and the two frequency bands are the first frequency band and the second frequency band; wherein the lowest frequency point of the second frequency band is higher than The highest frequency point of the first frequency band.

As an example, the frequency band used by the network device to transmit the downlink synchronization symbol is 0-35.328 MHz, and the 0-35.328 MHz may be divided into two frequency bands. The highest frequency point of the first frequency band is not higher than 17.664 MHz; the lowest frequency point of the second frequency band is higher than two of the highest frequency points of the first frequency band. The frequency point is the center frequency value of the frequency band in which the subcarrier or subchannel is located.

Further, the frequency band used by the network device to send the downlink synchronization symbol may be a combination of frequency bands used for transmitting downlink synchronization symbols in two different spectrum DSL modes, for example, the network device can simultaneously support VDSL2 (eg, VDSL2 17a) and The next-generation VDSL (such as VDSL2 35b), which supports the collection of frequency bands for transmitting downlink synchronization symbols under these two systems. The frequency band used for transmitting downlink synchronization symbols in VDSL2 mode is 0-176.64 MHz, and the next-generation VDSL mode. The frequency band used for transmitting the downlink synchronization symbol is at least 0-35.328 MHz, and the frequency band collection for transmitting the downlink synchronization symbol in these two modes is 0-35.328 MHz. At this time, the highest frequency point of the first frequency band is not higher than the highest frequency point of the overlapping frequency band for transmitting the downlink synchronization symbol in the DSL mode of the two different spectrums.

Optionally, the sounding subcarriers on the second frequency band and the sounding subcarriers on the first frequency band are different from each other.

Step 203: Allocating frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, so that the sounding subcarriers and the labeled subcarriers distributed on the second frequency band are respectively distributed on the first frequency band. The sounding subcarrier and the labeled subcarrier are symmetric based on a symmetric point; the symmetric point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band, or a lowest frequency point of the second frequency band a frequency point between the highest frequency points of the first frequency band.

Step 205: The network side device modulates the downlink pilot sequence to the detecting subcarriers on the first frequency band and the second frequency band, and then sends the downlink pilot sequence to the peer device.

Further, the method further includes: step 207 (not shown): the network side device And receiving a signal that is sent back by the peer device, where the signal fed back by the peer device reflects a signal received by the peer device on the detecting subcarriers in the first frequency band and the second frequency band.

More specifically, the signal fed back by the peer device is an error sample signal of the signal received by the peer device on the detecting subcarriers in the first frequency band and the second frequency band, or A signal obtained by frequency domain conversion of a received signal on a sounding subcarrier on the first frequency band and the second frequency band.

The foregoing assigning the frequency points on the first frequency band and the second frequency band to the detecting subcarriers and marking the subcarriers specifically includes: alternately allocating frequency points on the first frequency band to the detecting subcarriers and marking subcarriers according to the comb structure, The frequency points on the two frequency bands are alternately allocated to the sounding subcarriers and the labeled subcarriers.

Fig. 3 shows an example in which frequency points on the first frequency band are alternately allocated to the probe subcarriers and the labeled subcarriers in a comb structure. The range of 0 to 17.664 MHz corresponds to the frequency point of the sequence number 0 to 4095. The frequency points of the sequence numbers 10n, 10n+2, 10n+3, 10n+4, 10n+5, 10n+6, 10n+8, and 10n+9 Assigned to the probe subcarriers, where n is a non-negative integer; the frequency points with sequence numbers 10n+1 and 10n+7 are assigned to the labeled subcarriers. In the second frequency band, that is, the range of 17.665 MHz to 35.328 MHz corresponds to the frequency point of the serial number of 4097 to 8191, and the subcarriers of the sequence numbers 10n+1 and 10n+5 are assigned labeled subcarriers, and the sequence numbers are 10n, 10n+2. The frequency points of 10n+3, 10n+4, 10n+6, 10n+7, 10n+8, and 10n+9 are allocated to the probe subcarrier; here, the two subcarriers are symmetric based on the sequence number of 4096. Further, the frequency point between the symmetric frequency point 4096 or the two frequency bands may be allocated to any one of the subcarriers (including the probe subcarrier or the labeled subcarrier).

Obviously, the distribution rules of the labeled subcarriers and the detected subcarriers on the two subcarriers are different, and the distribution rule is the above-mentioned distribution function or law, for example, the distribution function of the labeled subcarriers in the first frequency band is 10n+1 and 10n+7, the other frequency points of the first frequency band are all detecting subcarriers; the distribution functions of the labeled subcarriers in the second frequency band are 10n+1 and 10n+5, and other frequency points of the second frequency band are detecting subcarriers.

Further, the network side device modulates a downlink pilot sequence to the first stage in an initialization phase The sounding subcarriers on the first and second frequency bands and the labeled subcarriers are modulated; and in the Showtime phase, the downlink pilot sequences are modulated onto the sounding subcarriers on the first and second frequency bands.

Further, the symmetry point is fixedly set in the device, or is determined by interactive negotiation with the peer device in a handshake phase or an initialization phase.

The method further includes the network side device performing precoding processing on the signal to be transmitted according to the signal fed back by the peer device.

In the embodiment of the method, when the network side device accesses the DSL mode of two different spectrums, the frequency band of the overlapping part is taken as a part of the frequency band, and the frequency band of the non-overlapping part is used as another part of the frequency band, and the allocation part is used in the two parts of the frequency band. The carrier (including the labeled subcarrier and the detected subcarrier), and ensures that the subcarriers in the two frequency bands are symmetrically distributed based on a certain symmetric point, so that subcarriers in the non-overlapping frequency band can be ensured even if aliasing or overlapping frequency bands occur The subcarriers can be aligned with the original subcarrier position even after mirroring. And because of the above subcarrier alignment, the crosstalk channel can be normally estimated for crosstalk cancellation.

The following describes the coexistence scenario of VDSL2 17a and VDSL2 35b as an example. The VDSL2 35b line will crosstalk to the VDSL2 17a line. Since the spectrum above 17.665Mhz of VDSL2 35b will crosstalk and alias to the spectrum below 17.664Mhz of VDSL2 17a, after using this scheme, the overlapping spectrum is guaranteed to 0-17664Mhz and does not overlap. The subcarriers in the spectrum of 17.665Mhz-35.328MHz (including the detected subcarriers and the labeled subcarriers) are symmetric, which ensures the position of the detected subcarriers and labeled subcarriers after aliasing and the original of 17.64MHz below VDSL2 17a. The positions of the probe subcarriers and the labeled subcarriers are always aligned; the crosstalk channel can be normally estimated for crosstalk cancellation. Correspondingly, the VDSL2 17a line will also crosstalk to the VDSL2 35b line. Since the spectrum below 17.664Mhz of VDSL2 17a will be mirrored and crosstalked to the spectrum above 17.665Mhz of VDSL2 35b, after using this scheme, the overlapping spectrum is guaranteed to 0-17664. The symmetry of the subcarriers (including the probe subcarriers and the labeled subcarriers) in the Mhz and non-overlapping spectrums of 17.665Mhz-35.328MHz will ensure the position of the detected subcarriers and the labeled subcarriers after mirroring and the 17.665MHz of the VDSL2 35b. Above original exploration The position of the subcarrier carrier and the labeled subcarrier are always aligned; the crosstalk channel can be normally estimated for crosstalk cancellation.

The embodiment of the invention provides a signal processing method, as shown in FIG. 4, including

Step 401: The user side device divides the frequency band used for transmitting the uplink synchronization symbol into at least two frequency bands that do not overlap, where the two frequency bands are the first frequency band and the second frequency band; the lowest frequency point of the second frequency band is higher than The highest frequency point of the first frequency band.

As an example, the frequency band used by the user equipment to send the uplink synchronization symbol is 0-35.328 MHz, and the 0-35.328 MHz may be divided into two frequency bands. The highest frequency point of the first frequency band is not higher than 17.664 MHz; the lowest frequency point of the second frequency band is higher than two of the highest frequency points of the first frequency band. The frequency point is the center frequency value of the frequency band in which the subcarrier or subchannel is located.

Further, the frequency band used by the user equipment to send the uplink synchronization symbol may be a combination of frequency bands used for transmitting the uplink synchronization symbol in the DSL mode of two different spectrums, for example, the network device can simultaneously support VDSL2 (for example, VDSL2 17a) And the next-generation VDSL (such as VDSL2 35b), the two bands supported by the two systems for transmitting uplink synchronization symbols, the frequency band used for transmitting uplink synchronization symbols in VDSL2 17a mode is 0-176.64 MHz, and the next In the first generation VDSL mode, the frequency band for transmitting the uplink synchronization symbol is at least 0-35.328 MHz. The frequency band collection of the two modes for transmitting the uplink synchronization symbol is 0-35.328 MHz, and the overlapping frequency band is 0-176.64 MHz. At this time, the highest frequency point of the first frequency band is not higher than the highest frequency point of the overlapping frequency band for transmitting the uplink synchronization symbol in the DSL mode of the two different spectrums.

Step 403: Allocating frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, so that the sounding subcarriers and the labeled subcarriers distributed on the second frequency band are respectively distributed on the first frequency band. The sounding subcarrier and the labeled subcarrier are symmetric based on a symmetric point; the symmetric point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band, or a lowest frequency point of the second frequency band A frequency point between the highest frequency point of the first frequency band.

Step 405: The user side device modulates the uplink pilot sequence to the sounding subcarriers on the first frequency band and the second frequency band, and then sends the uplink pilot sequence to the peer device.

Further, the user side device modulates an uplink pilot sequence to the sounding subcarriers and the labeled subcarriers on the first frequency band and the second frequency band in an initialization phase; and modulates the uplink pilot sequence to the On the probe subcarriers on the first frequency band and the second frequency band.

Further, the symmetry point is fixedly set in the device, or is determined after the peer device negotiates through interaction in the Handshake or initialization phase.

In the embodiment of the method, when the network side device accesses the DSL mode of two different spectrums, the overlapping frequency band is used as a part of the frequency band, and the non-overlapping frequency band is used as another partial frequency band, and the subcarriers are allocated on the two partial frequency bands ( Including the labeled subcarriers and the detecting subcarriers, and ensuring that the subcarriers in the two frequency bands are symmetrically distributed based on a certain symmetric point, so that the subcarriers in the non-overlapping frequency bands can be ensured even if subcarriers in the overlapping or overlapping frequency bands occur It can be aligned with the original subcarrier position even after mirroring. Just because the probe subcarrier and the labeled subcarrier are respectively aligned, the crosstalk channel can be normally estimated for crosstalk cancellation.

The embodiment of the present invention further provides a network side device 500. As shown in FIG. 5, the network side device 500 includes a spectrum dividing module 501 and a signal sending module 503.

The spectrum dividing module 501 divides a frequency band used for transmitting a downlink synchronization symbol into at least two frequency bands that do not overlap, wherein the two frequency bands are a first frequency band and a second frequency band; and the lowest frequency point of the second frequency band is higher than The highest frequency point of the first frequency band;

And allocating frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, so that the detected subcarriers and the labeled subcarriers distributed on the second frequency band are respectively detected with the first frequency band The subcarrier and the labeled subcarrier are symmetric based on a symmetry point; the symmetry point is the second a frequency point between a lowest frequency point of the frequency band, a highest frequency point of the first frequency band, or a lowest frequency point of the second frequency band and a highest frequency point of the first frequency band.

The signal sending module 503 is configured to: the network side device modulates the downlink pilot sequence to the detecting subcarriers on the first frequency band and the second frequency band, and then sends the downlink pilot sequence to the peer device.

Further, the frequency band used by the network device to send the downlink synchronization symbol may be a combination of frequency bands used for transmitting the downlink synchronization symbol in the DSL mode of two different spectrums; the highest frequency point of the first frequency band is not higher than The highest frequency point of the overlapping frequency band in which the downlink synchronization symbol is transmitted in the DSL mode of two different spectrums.

Further, the network side device 500 further includes a signal receiving module 505 (not shown) for receiving a signal fed back by the peer device, and the signal fed back by the peer device reflects the peer device. A signal received on a sounding subcarrier on the first frequency band and the second frequency band.

Further, the spectrum division module 501 specifically includes the frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, and the spectrum dividing module 501 performs the frequency on the first frequency band according to the comb structure. Points are alternately allocated to the probe subcarriers and the labeled subcarriers, and the frequency points on the second frequency band are alternately allocated to the probe subcarriers and the labeled subcarriers.

Further, the signal sending module 503 modulates the downlink pilot sequence to the sounding subcarriers and the labeled subcarriers on the first frequency band and the second frequency band in an initialization phase; and modulates the downlink pilot sequence to the On the probe subcarriers on the first and second bands.

Further, the network side device 500 is a DSLAM device, the spectrum dividing module 501 is a processing chip in the DSLAM device, and the signal sending module 503 is a signal transmitter in the DSLAM. Further, the signal receiving module 505 is a signal receiver in the DSLAM.

It should be noted that the specific actions performed by the modules in the network side device 500 are the methods in the foregoing method embodiments, and the effects are also the same, and details are not described herein again.

The embodiment of the present invention further provides a user side device 600. As shown in FIG. 6, the user side device is 600 includes a spectrum division module 601 and a signal transmission module 603;

The spectrum division module 601 is configured to divide the frequency band used for transmitting the uplink synchronization symbol into at least two frequency bands that are not overlapped, where the two frequency bands are the first frequency band and the second frequency band; and the second frequency band is the lowest The frequency point is higher than the highest frequency point of the first frequency band;

And allocating frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, so that the detected subcarriers and the labeled subcarriers distributed on the second frequency band are respectively detected with the first frequency band The subcarrier and the labeled subcarrier are based on a symmetric point symmetry; the symmetry point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band or a lowest frequency point of the second frequency band, and the A frequency point between the highest frequency points of the first frequency band.

The signal sending module 603 is configured to modulate the uplink pilot sequence to the detecting subcarriers on the first frequency band and the second frequency band, and then send the uplink pilot sequence to the peer device.

Further, the frequency band used by the user equipment to send the uplink synchronization symbol may be a combination of frequency bands used for transmitting the uplink synchronization symbol in the DSL mode of two different spectrums, and the highest frequency point of the first frequency band is not higher than The DSL mode of the two different spectrums transmits the highest frequency point of the overlapping frequency band of the uplink synchronization symbol.

Further, the signal sending module 603 modulates an uplink pilot sequence to the sounding subcarriers and the labeled subcarriers on the first frequency band and the second frequency band in an initialization phase; and modulates the uplink pilot sequence to the Showtime phase to On the detected subcarriers on the first frequency band and the second frequency band.

Further, the user side device 600 is a CPE, the spectrum dividing module 601 is a processing chip in the CPE, and the signal sending module 603 is a signal transmitter in the CPE.

It should be noted that the specific actions performed by the modules in the user-side device 600 are the methods in the foregoing method embodiments, and the effects are also the same, and details are not described herein again.

The embodiment of the present invention further provides a network system 700 including a network side device 701 and a user side device 703. As shown in FIG. 7, the network side device 701 and the user side device 703 pass the twisted pair 705. connection.

The network side device 701 is the network side device 500 in the above embodiment;

Or the user side device 703 is the user side device 600 in the above embodiment.

It should be further noted that the specific actions performed by the network side device or the user side device are the methods in the foregoing method embodiments, and specific steps are not described herein.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk. The network processing described in detail above may be implemented on a general purpose component such as a computer or network component having sufficient processing power, memory resources, and network throughput capabilities. FIG. 8 schematically illustrates an electrical universal network component 800 suitable for implementing one or more embodiments of the components disclosed herein. The network component 800 includes a processor 802 (which may be referred to as a central processing unit or CPU) that includes a second memory 804, a read only memory (ROM) 806, a random access memory (RAM) 808, input/ The output (I/O) device 810 and the network connectivity device 812 communicate with the memory device. The processor 802 can be implemented as one or more CPU chips or as part of one or more application specific integrated circuits.

The second memory 804 is typically comprised of one or more disk drives or disk drives and is used for non-volatile storage of data and as an overflow data storage device if the RAM 808 is not sufficient to accommodate all of the operational data. The second memory 804 can be used to store programs that are loaded into the RAM 808 when selected for execution. ROM 806 is used to store instructions and data that is read during program execution. ROM 806 is a non-volatile memory device that typically has a smaller memory capacity relative to the larger memory capacity of second memory 804. RAM 808 is used to store volatile data and may store instructions. Access to ROM 806 and RAM 808 is typically faster than access to second memory 804.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, and not The invention is described in detail with reference to the foregoing embodiments, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments may be modified or some or all of the technical features may be modified. The equivalents are made without departing from the scope of the technical solutions of the embodiments of the present invention.

Claims

A signal processing method, characterized in that the method comprises

The network side device divides the frequency band used for transmitting the downlink synchronization symbol into at least two frequency bands that do not overlap, wherein the two frequency bands are the first frequency band and the second frequency band; wherein the lowest frequency point of the second frequency band is higher than the The highest frequency point of the first frequency band;

Allocating frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, so that the sounding subcarriers and the labeled subcarriers distributed on the second frequency band are respectively distributed with the detectors distributed on the first frequency band The carrier and the labeled subcarrier are symmetric based on a symmetric point; the symmetric point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band, or a lowest frequency point of the second frequency band, and the first a frequency point between the highest frequency points of a frequency band;

The network side device modulates the downlink pilot sequence to the probe subcarriers on the first frequency band and the second frequency band, and then sends the downlink pilot sequence to the peer device.
The method according to claim 1, wherein the allocating the frequency points on the first frequency band and the second frequency band to the detecting subcarriers and marking the subcarriers comprises: transmitting the frequency in the first frequency band according to the comb structure Points are alternately allocated to the probe subcarriers and the labeled subcarriers, and the frequency points on the second frequency band are alternately allocated to the probe subcarriers and the labeled subcarriers.
The method according to claim 1 or 2, wherein the sounding subcarriers on the second frequency band and the sounding subcarriers on the first frequency band are different from each other.
The method according to claim 1 or 2, wherein the frequency band used by the network device to transmit the downlink synchronization symbol is a combination of frequency bands for transmitting downlink synchronization symbols in the DSL mode of two different spectrums; The highest frequency point of a frequency band is not higher than the highest frequency point of the overlapping frequency band in which the downlink synchronization symbol is transmitted in the DSL mode of the two different spectrums.
The method according to claim 1, wherein said network side device modulates a downlink pilot sequence to a sounding subcarrier and a marker on said first frequency band and said second frequency band in an initialization phase And transmitting, on the carrier, the downlink pilot sequence to the sounding subcarriers on the first frequency band and the second frequency band in a data transmission phase.
The method according to any one of claims 1-5, wherein the symmetry point is fixedly set in the device or determined by interactive negotiation with the peer device during the handshake phase or the initialization phase.
The method according to any one of claims 1-5, wherein the method further comprises: the network side device receiving a signal fed back by the peer device, and the signal fed back by the peer device reflects A signal received by the peer device on the sounding subcarriers on the first frequency band and the second frequency band.
The method according to claim 7, wherein the signal fed back by the peer device is an error sample signal of the signal received by the peer device on the sounding subcarriers on the first frequency band and the second frequency band. Or a frequency domain converted signal of the received signal on the detected subcarriers on the first frequency band and the second frequency band.
A signal processing method, the method comprising

The user side device divides the frequency band used for transmitting the uplink synchronization symbol into at least two frequency bands that do not overlap, the two frequency bands are the first frequency band and the second frequency band; the lowest frequency point of the second frequency band is higher than the foregoing The highest frequency point of a frequency band;

Allocating frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, so that the sounding subcarriers and the labeled subcarriers distributed on the second frequency band are respectively distributed with the detectors distributed on the first frequency band The carrier and the labeled subcarrier are symmetric based on a symmetric point; the symmetric point is a lowest frequency point of the second frequency band, a highest frequency point of the first frequency band, or a lowest frequency point of the second frequency band, and the first a frequency point between the highest frequency points of a frequency band;

The user side device modulates the uplink pilot sequence to the sounding subcarriers on the first frequency band and the second frequency band, and then sends the uplink pilot sequence to the peer device.
The method of claim 9 wherein said detecting subcarriers on said second frequency band The wave and the detection subcarrier distribution rules on the first frequency band are different.
The method according to claim 9 or 10, wherein the frequency band used by the user equipment for transmitting the uplink synchronization symbol is a combination of frequency bands for transmitting uplink synchronization symbols in the DSL mode of two different spectrums, The highest frequency point of the first frequency band is not higher than the highest frequency point of the overlapping frequency band for transmitting the uplink synchronization symbol in the DSL mode of the two different spectrums.
The method according to claim 11, wherein the user side device modulates an uplink pilot sequence to the sounding subcarriers and the labeled subcarriers on the first frequency band and the second frequency band in an initialization phase; The data transmission phase modulates the uplink pilot sequence onto the sounding subcarriers on the first and second frequency bands.
The method according to claim 9 or 10, wherein the symmetry point is fixedly set in the device or determined by interactive negotiation with the peer device during the handshake phase or the initialization phase.
A network side device, where the network side device includes a spectrum dividing module 501 and a signal sending module 503;

The spectrum dividing module 501 divides a frequency band used for transmitting a downlink synchronization symbol into at least two frequency bands that do not overlap, wherein the two frequency bands are a first frequency band and a second frequency band; and the lowest frequency point of the second frequency band is higher than The highest frequency point of the first frequency band; and the frequency points on the first frequency band and the second frequency band are allocated to the sounding subcarriers and the labeled subcarriers, so that the sounding subcarriers and the labels distributed on the second frequency band are The subcarriers are respectively symmetric with the detected subcarriers and the labeled subcarriers distributed on the first frequency band based on a symmetric point; the symmetric point is the lowest frequency point of the second frequency band, and the highest frequency point or location of the first frequency band a frequency point between a lowest frequency point of the second frequency band and a highest frequency point of the first frequency band;

The signal sending module 503 is configured to: the network side device modulates the downlink pilot sequence to the detecting subcarriers on the first frequency band and the second frequency band, and then sends the downlink pilot sequence to the peer device.
The network side device according to claim 14, wherein the sounding subcarriers on the second frequency band and the sounding subcarriers on the first frequency band are different from each other.
The network side device according to claim 14 or 15, wherein the frequency band for transmitting the downlink synchronization symbol is a combination of frequency bands for transmitting downlink synchronization symbols in two different frequency spectrum DSL modes; The highest frequency point of a frequency band is not higher than the highest frequency point of the overlapping frequency band in which the downlink synchronization symbol is transmitted in the DSL mode of the two different spectrums.
The network side device according to claim 14 or 15, wherein the spectrum dividing module 501 allocates frequency points on the first frequency band and the second frequency band to the sounding subcarriers and the labeled subcarriers, and specifically includes the frequency spectrum. The dividing module 501 alternately allocates frequency points on the first frequency band to the detecting subcarriers and the labeled subcarriers according to the comb structure, and alternately allocates frequency points on the second frequency band to the detecting subcarriers and the labeled subcarriers.
The network side device according to claim 16, wherein the network side device further comprises a signal receiving module 505, configured to receive a signal fed back by the peer device, where the signal reflects that the peer device is in the The signals received on the sounding subcarriers on the first frequency band and the second frequency band.
The network side device according to any one of claims 14 to 18, wherein the signal transmitting module 503 modulates the downlink pilot sequence to the detecting subcarriers and the marker on the first frequency band and the second frequency band in an initialization phase. And transmitting, on the carrier, the downlink pilot sequence to the sounding subcarriers on the first frequency band and the second frequency band in a data transmission phase.
The network side device according to claim 14, wherein the network side device is a DSLAM device, the spectrum dividing module 501 is a processing chip in a DSLAM device, and the signal sending module 503 is a signal transmission in a DSLAM. Device.
A user side device, where the user side device includes a spectrum dividing module 601 and a signal sending module 603;

The spectrum division module 601 divides the frequency band used for transmitting the uplink synchronization symbol into at least two frequency bands that do not overlap, the two frequency bands are the first frequency band and the second frequency band; and the lowest frequency point of the second frequency band Higher than the highest frequency point of the first frequency band; and the frequency points on the first frequency band and the second frequency band are allocated to the sounding subcarriers and the labeled subcarriers, so that the detectors distributed on the second frequency band are The carrier and the labeled subcarrier are respectively symmetric with the detected subcarrier and the labeled subcarrier distributed on the first frequency band based on a symmetric point; the symmetric point is the lowest frequency of the second frequency band, and the highest frequency of the first frequency band a frequency point between a point or a lowest frequency point of the second frequency band and a highest frequency point of the first frequency band;

The signal sending module 603 is configured to modulate the uplink pilot sequence to the detecting subcarriers on the first frequency band and the second frequency band, and then send the uplink pilot sequence to the peer device.
The user equipment according to claim 21, wherein the frequency band used for transmitting the uplink synchronization symbol is a combination of frequency bands used for transmitting uplink synchronization symbols in two different spectrum DSL modes, the first frequency band The highest frequency point is not higher than the highest frequency point of the overlapping frequency band in which the uplink synchronization symbol is transmitted in the DSL mode of the two different spectrums.
The user side device according to claim 21 or 22, wherein the signal transmitting module 603 modulates an uplink pilot sequence to the sounding subcarriers and markers on the first frequency band and the second frequency band in an initialization phase. On the carrier; and modulating the uplink pilot sequence to the sounding subcarriers on the first and second frequency bands during the data transmission phase.
The user side device according to any one of claims 19 to 21, wherein the user side device is a customer premises equipment (CPE), the spectrum division module 601 is a processing chip in the CPE, and the signal sending module is 603 is a signal transmitter in the CPE.
A network system includes a network side device 701 and a user side device 703. The network side device 701 and the user side device 703 are connected by a twisted pair 705.

The network side device 701 is the network side device according to any one of claims 14-20; or

The user side device 703 is the user side device according to any one of claims 21-24.