WO2016172885A1 - 一种发送信号的方法、装置和系统 - Google Patents

一种发送信号的方法、装置和系统 Download PDF

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Publication number
WO2016172885A1
WO2016172885A1 PCT/CN2015/077820 CN2015077820W WO2016172885A1 WO 2016172885 A1 WO2016172885 A1 WO 2016172885A1 CN 2015077820 W CN2015077820 W CN 2015077820W WO 2016172885 A1 WO2016172885 A1 WO 2016172885A1
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Prior art keywords
signal
frequency band
vdsl2
vdsl3
line
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PCT/CN2015/077820
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English (en)
French (fr)
Inventor
涂建平
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201580005093.XA priority Critical patent/CN108028678B/zh
Priority to PCT/CN2015/077820 priority patent/WO2016172885A1/zh
Priority to EP15890265.0A priority patent/EP3255807B1/en
Publication of WO2016172885A1 publication Critical patent/WO2016172885A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H04B3/487—Testing crosstalk effects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, apparatus, and system for transmitting signals.
  • xDSL Digital Subscriber Line
  • UDP Unshielded Twist Pair
  • the xDSL of the passband transmission uses Frequency Division Multiplexing (FDM) technology to make xDSL and the Plain Old Telephone Service (POTS) coexist on the same pair of twisted pairs, where xDSL occupies a high frequency band and POTS occupies 4
  • FDM Frequency Division Multiplexing
  • POTS Plain Old Telephone Service
  • a baseband portion below kilohertz (KHz) at the signal receiving end, a splitter is used to separate the POTS signal from the xDSL signal.
  • a system that provides multiple xDSL access is called a DSL Access Multiplexer (DSLAM).
  • DSL Access Multiplexer DSL Access Multiplexer
  • Crosstalk includes Near-end Crosstalk (NEXT) and Far-end Crosstalk (FEXT), where both NEXT and FEXT energy are enhanced as the frequency band increases.
  • NEXT Near-end Crosstalk
  • FEXT Far-end Crosstalk
  • Existing xDSL technologies such as ADSL, ADSL2, ADSL2+, VDSL, VDSL2, etc., use Frequency Division Duplexing (FDD) for uplink and downlink channels.
  • FDD Frequency Division Duplexing
  • the VDSL2 standard defines eight configuration attributes (profiles), called 8a, 8b, 8c, 8d, 12a, 12b, 17a, 30a.
  • profiles there are also multiple attributes of the line, but multiple attributes are required.
  • the subcarrier spacing of the line is the same. Since the subcarrier spacing of the original 30a Profile is twice that of other profiles, it cannot coexist in the Vector.
  • ITU-T is currently developing the next-generation VDSL2 standard, VDSL3.
  • the 30a line is the same as the 17a subcarrier spacing, so that the 17a line (that is, the line with the attribute 17a) and the 30a line (that is, the line with the attribute 30a) coexist, within 17M. Perform normal Vectoring cancellation. However, on the one hand, the 17a line is outside the 17M There is also an out-of-band spectrum. Although a low-pass filter can be used, the out-of-band spectral power of 17-21 MHz is still above -80 dBm/Hz. In the downstream direction, the out-of-band spectrum of the signal transmitted on the 17a line will be 17M for the 30a line.
  • the above frequencies produce strong FEXT interference; on the other hand, the spectrum above 17M of the 30a line will also generate FEXT interference to the out-of-band spectrum of the 17a line.
  • the modem at the receiving end of the 17a line uses 1x sampling, this part is out of band. Interference can be aliased into the band of the 17a line, causing the 17a line rate to decrease.
  • VDSL2CPE is not upgraded to VDSL3CPE.
  • VDSL3 can be backward compatible with transmitting VDSL2 signals. 2 times sampling can eliminate the interference of VDSL2 out-of-band transmission signals to VDSL3 lines, but VDSL3 lines. The out-of-band crosstalk on the VDSL2 line still exists, and the VDSL2CPE will interfere with the VDSL2 band after 1x sampling.
  • Embodiments of the present invention provide a method, apparatus, and system for transmitting a signal, which are used to eliminate out-of-band crosstalk of a VDSL3 line to a VDSL2 line.
  • a method of transmitting a signal comprising:
  • the first signal and the first pre-compensation signal are combined into a second signal, and the second signal is sent to the VDSL2 user front end device.
  • the first pre-compensation signal is equal to a product of the VDSL3 signal of the second frequency band and the crosstalk coefficient.
  • the crosstalk coefficient of the VDSL3 line to the VDSL2 line is obtained by:
  • a method of transmitting a signal including:
  • the first signal, the first pre-compensation signal and the image signal are combined into a second signal, and the second signal is sent to a VDSL2 user front end device.
  • the method further includes:
  • VDSL3 signal and the second pre-compensation signal are combined into a third signal and sent to the VDSL3 user front end device.
  • the crosstalk coefficient of the VDSL3 signal in the second frequency band to the VDSL2 line is:
  • the image signal is a symmetric conjugate signal of the first signal.
  • a vectorization control entity including:
  • a first generating unit configured to generate a first signal in the first frequency band, where the first frequency band refers to a VDSL2 frequency band;
  • a second generating unit configured to generate a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL3 line of the second frequency band to the VDSL2 line in the second frequency band, where the second frequency band refers to The VDSL3 frequency band overlapping with the VDSL2 frequency band, the first pre-compensation signal is used for the out-of-band far-end crosstalk cancellation of the VDSL3 line to the VDSL2 line after receiving the VDSL2 user front-end equipment;
  • a third generating unit configured to synthesize the first signal and the first pre-compensation signal into a second signal, where the second signal is sent to a VDSL2 user front end device.
  • the second generating unit specifically includes:
  • the second generating unit specifically includes:
  • a first sending unit configured to send a pilot sequence to the VDSL2 user front end device
  • a first receiving unit configured to receive an error signal fed back by the VDSL2 user front end device
  • a first calculating unit configured to calculate a crosstalk coefficient of the VDSL3 line to the VDSL2 line according to the error signal.
  • a vectorization control entity including:
  • a fourth generating unit configured to generate a first signal in the first frequency band, where the first frequency band refers to a VDSL2 frequency band;
  • a fifth generating unit configured to generate an image signal of the first signal in a second frequency band, where the second frequency band refers to a VDSL3 frequency band that does not overlap with a VDSL2 frequency band;
  • a sixth generating unit configured to generate a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL3 line to the VDSL2 line in the second frequency band, where the first pre-compensation signal is used for VDSL2
  • a seventh generating unit configured to synthesize the first signal, the first pre-compensation signal, and the image signal into a second signal, where the second signal is sent to the VDSL2 user front-end device.
  • the method further includes:
  • An eighth generating unit configured to generate, in the second frequency band, a second pre-compensation signal according to the cross-talk coefficient of the VDSL3 line according to the image signal and the image signal;
  • a ninth generating unit configured to synthesize the VDSL3 signal and the second pre-compensation signal into a third signal, where the third signal is sent to the VDSL3 user front-end device.
  • the sixth generating unit specifically includes:
  • a second sending unit configured to send a pilot sequence to the VDSL2 user front end device
  • a second receiving unit configured to receive an error signal fed back by the VDSL2 user front end device
  • a second calculating unit configured to calculate a VDSL3 letter of the second frequency band according to the error signal The crosstalk coefficient of the VDSL2 line.
  • a system including a central office end and a user end, wherein the central office end includes the vectorization control entity described above, and the user end includes a user front end device. .
  • a sixth aspect provides a data communication apparatus including a processor, a memory, and a bus system, wherein the processor and the memory are connected by the bus system, the memory is for storing instructions, and the processor is configured to execute The instructions stored in the memory,
  • the processor is configured to generate a first signal in a first frequency band, where the first frequency band refers to a VDSL2 frequency band, and in the second frequency band, according to the VDSL3 signal of the second frequency band and the VDSL3 line pair.
  • the crosstalk coefficient of the VDSL2 line generates a first pre-compensation signal
  • the second frequency band refers to a VDSL3 frequency band that does not overlap with the VDSL2 frequency band, where the first pre-compensation signal is used after the user front-end equipment receives the VDSL3 line pair.
  • Out-of-band far-end crosstalk cancellation of the VDSL2 line synthesizing the first signal and the first pre-compensation signal into a second signal, the second signal being sent to a VDSL2 user front-end device.
  • a sixth aspect provides a data communication apparatus including a processor, a memory, and a bus system, wherein the processor and the memory are connected by the bus system, the memory is for storing instructions, and the processor is configured to execute The instructions stored by the memory,
  • the processor is configured to generate a first signal in a first frequency band, where the first frequency band refers to a VDSL2 frequency band, and in the second frequency band, an image signal of the first signal, the second frequency band is generated.
  • the VDSL3 frequency band that does not overlap with the VDSL2 frequency band; generates a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL2 line to the VDSL2 line, and the first pre-compensation signal is used for VDSL2
  • the user front-end device cancels the out-of-band far-end crosstalk of the VDSL3 line to the VDSL2 line; synthesizes the first signal, the first pre-compensation signal and the image signal into a second signal, and the second signal is sent to the VDSL2 user front-end equipment.
  • the embodiment of the present invention generates the first signal in the VDSL2 frequency band by using the data to be transmitted, and then selects the frequency band not overlapping with the VDSL2 in the VDSL3 frequency band according to the outband crosstalk signal of the VDSL3 to the VDSL2 and the VDSL3 line to the VDSL2 line.
  • the out-of-band crosstalk cancellation coefficient generates a first pre-compensation signal, which is used by the user front-end device to cancel the out-of-band far-end crosstalk of VDSL3 to VDSL2, and finally the first signal and the first signal
  • a pre-compensation signal is synthesized into a second signal and sent to the VDSL2 user front end device.
  • the embodiment of the present invention generates a pre-compensation signal of the out-of-band crosstalk of the VDSL3 line to the VDSL2 line in the out-of-band of the VDSL2, so that The signal at the receiving end of the VDSL2 does not contain out-of-band interference.
  • Figure 1 is a schematic diagram of the far-end crosstalk
  • FIG. 2 is a schematic diagram of a near-end crosstalk
  • FIG. 3 is a flowchart of a method for transmitting a signal according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of crosstalk estimation according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for transmitting a signal according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a vectorized control entity according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a vectorized control entity according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a vectorized control entity according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a system according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a communication apparatus according to an embodiment of the present invention.
  • an embodiment of the present invention discloses a method for transmitting a signal, including the following steps:
  • Step 310 The Vectoring Control Entity (VCE) generates a first signal in the first frequency band, where the first frequency band refers to the VDSL2 frequency band.
  • VCE Vectoring Control Entity
  • the vector control entity VCE of the central office generates the first signal in the VDSL2 frequency band, that is, the 0 to 17.6 MHz frequency band.
  • the first signal can be understood as the in-band signal of VDSL2, which is equivalent to the VDSL3 port degraded to VDSL2 port to transmit VDSL2 in-band signal, which is equivalent to VDSL3 port does not send any signal in 17.6 ⁇ 35.2MHz, only works in the frequency band of 0 ⁇ 17.6MHz. Inside.
  • Step 320 The central office VCE is in the second frequency band according to the VDSL3 signal of the second frequency band and The VDSL3 line generates a first pre-compensation signal for the crosstalk coefficient of the VDSL2 line, and the second frequency band refers to a VDSL3 frequency band that does not overlap with the VDSL2 frequency band, where the first pre-compensation signal is used after the user front-end equipment receives the The VDSL3 line cancels the out-of-band far-end crosstalk of the VDSL2 line.
  • the VDSL2 frequency band is 0 to 17.6 MHz
  • the VDSL3 frequency band is 0 to 35.2 MHz
  • the non-overlapping frequency band is 17.6-35.2 MHz.
  • the first pre-compensation signal is generated by selecting a frequency band of 17.6-35.2 MHz.
  • the first pre-compensation signal cancels the out-of-band far-end crosstalk of the VDSL2 line with the VDSL3 line, and the received signal has only the first signal.
  • the crosstalk coefficient of the VDSL3 line to the VDSL2 line is obtained by the VCE transmitting a pilot sequence to the user front end equipment, and the VDSL2CPE is based on the interference feedback error of the VDSL3 line to the VDSL2 line.
  • the VCE calculates the crosstalk coefficient of the VDSL3 line to the VDSL2 line based on the error feedback.
  • the VCE generates a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL3 line to the VDSL2 line in the second frequency band.
  • Step 330 The central office VCE synthesizes the first signal and the first pre-compensation signal into a second signal, and sends the second signal to a VDSL2 user front-end device.
  • the central office sends the second signal to the VDSL2 user front-end device by using double sampling, and the VDSL2 user front end does not measure the in-band signal after double sampling. Have an impact.
  • the central office uses the VDSL3 port to transmit the VDSL2 signal, and at the same time, generates the first pre-compensation signal of the VDSL3 line to the VDSL2 line outside the outband of the VDSL2, so that the VDSL2 out-of-band signal received by the VDSL2 user front-end device is eliminated, and the CPE side is eliminated. Do not affect the in-band signal after one-time sampling.
  • an embodiment of the present invention further discloses a method for sending a signal, including:
  • Step 510 The central office VCE generates a first signal in the first frequency band, where the first frequency band refers to the VDSL2 frequency band.
  • the Vectoring Control Entity (VCE) of the central office generates the first signal in the frequency band of 0 to 17.6 MHz in the VDSL2 frequency band.
  • the first signal can be understood as the in-band signal of VDSL2, which is equivalent to the VDSL3 port degraded to VDSL2 port to transmit VDSL2 in-band signal, which is equivalent to VDSL3 port does not send any signal in 17.6 ⁇ 35.2MHz, only works in the frequency band of 0 ⁇ 17.6MHz. Inside.
  • Step 520 The central office VCE produces the image signal of the first signal in the second frequency band, and the second frequency band refers to the VDSL3 frequency band that does not overlap with the VDSL2 frequency band.
  • the image signal is a symmetric conjugate signal of the first signal.
  • Step 530 The central office VCE generates a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL3 line to the VDSL2 line in the second frequency band, where the first pre-compensation signal is used. After the VDSL2 user front-end equipment receives, it cancels out the out-of-band far-end crosstalk of the VDSL3 line to the VDSL2 line.
  • Step 540 The central office VCE synthesizes the first signal, the first pre-compensation signal and the image signal into a second signal and sends the signal to the VDSL2 user front-end device.
  • Step 550 Generate a second pre-compensation signal for the crosstalk coefficient of the VDSL3 line according to the image signal and the image signal in the second frequency band.
  • Step 560 Synthesize the VDSL3 signal and the second pre-compensation signal into a third signal and send the signal to the VDSL3 user front-end device.
  • an embodiment of the present invention further discloses a vectorization control entity, including:
  • the first generating unit 610 is configured to generate the first signal in the VDSL2 frequency band.
  • the first generating unit generates the first signal in the frequency band of 0 to 17.6 MHz in the VDSL2 frequency band.
  • the first signal can be understood as the in-band signal of VDSL2, which is equivalent to the VDSL3 port degraded to VDSL2 port to transmit VDSL2 in-band signal, which is equivalent to VDSL3 port does not send any signal in 17.6 ⁇ 35.2MHz, only works in the frequency band of 0 ⁇ 17.6MHz. Inside.
  • a second generating unit 620 configured to generate, according to the second frequency band, a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL3 line of the second frequency band to the VDSL2 line, where the second frequency band refers to The VDSL3 frequency band does not overlap with the VDSL2 frequency band, and the first pre-compensation signal is used for the out-of-band far-end crosstalk cancellation of the VDSL3 line to the VDSL2 line after the VDSL2 user front-end equipment receives.
  • the VDSL2 frequency band is 0 to 17.6 MHz
  • the VDSL3 frequency band is 0 to 35.2 MHz
  • the non-overlapping frequency band is 17.6-35.2 MHz.
  • the first pre-compensation signal is generated by selecting a frequency band of 17.6-35.2 MHz.
  • the central office uses the VDSL3 port to transmit the VDSL2 signal, and simultaneously generates the first pre-compensation signal outside the VDSL3 line to the VDSL2 line in the out-of-band of the VDSL2.
  • VDSL2 user After the front-end device receives the signal sent by the central office, the first pre-compensation signal and the VDSL3 line cancel the out-of-band far-end crosstalk of the VDSL2 line, which is equal to the received signal only the first signal, and the VDSL2CPE side does not sample twice. It has an effect on the in-band signal.
  • the third generating unit 630 is configured to synthesize the first signal and the first pre-compensation signal into a second signal, and send the second signal to a VDSL2 user front-end device.
  • the first signal and the first pre-compensation signal are generated after the in-band signal of VDSL3, and the central office transmits the second signal to the user front-end device by using double sampling, so there is no out-of-band leakage signal.
  • the second generating unit 620 specifically includes:
  • a first sending unit configured to send a pilot sequence to a VDSL2 user front end device
  • a first receiving unit configured to receive an error signal fed back by the VDSL2 user front end device
  • a first calculating unit configured to calculate a crosstalk coefficient of the VDSL3 line to the VDSL2 line according to the error signal.
  • the VDSL2 signal is sent by using the VDSL3 port, and the first pre-compensation signal of the VDSL3 to the VDSL2 is generated outside the outband of the VDSL2, so that the outband signal of the VDSL2 received by the CPE side is eliminated, and the CPE of the user end performs one-time sampling. Does not affect the in-band signal.
  • an embodiment of the present invention further discloses a vectorization control entity, including:
  • the fourth generating unit 710 is configured to generate a first signal in the first frequency band, where the first frequency band refers to a VDSL2 frequency band. Among them, the VDSL2 frequency band is 0 to 17.6 MHz.
  • the fifth generating unit 720 is configured to generate an image signal of the first signal in a second frequency band, where the second frequency band refers to a VDSL3 frequency band that does not overlap with a VDSL2 frequency band.
  • the VDSL3 frequency band is 0 to 35.2 MHz, and the non-overlapping frequency band is 17.6-35.2 MHz.
  • a sixth generating unit 730 configured to generate a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL3 line to the VDSL2 line in the second frequency band, where the first pre-compensation signal is used
  • the VDSL2 user front-end equipment receives the out-of-band far-end crosstalk cancellation from the VDSL3 line to the VDSL2 line.
  • the seventh generating unit 740 is configured to synthesize the first signal and the first pre-compensation signal into a second signal, and send the second signal to a VDSL2 user front-end device.
  • the first pre-compensation signal cancels the out-of-band far-end crosstalk of the VDSL3 line to the VDSL2 line, and is equal to the received signal only the first signal.
  • the vectorization control entity shown in FIG. 7 further includes: an eighth generation unit 750, in the second frequency
  • the segment generates a second pre-compensation signal according to the crosstalk coefficient of the VDSL3 line according to the image signal and the image signal.
  • the ninth generating unit 760 is configured to synthesize the VDSL3 signal and the second pre-compensation signal into a third signal and send the signal to the VDSL3 user front-end device.
  • the VDSL3 signal received by the VDSL3 user front-end device includes a cancellation signal for the crosstalk of the image signal to the VDSL3 line, and the cancellation signal and the crosstalk signal cancel each other, thereby eliminating the influence of the image signal on the crosstalk of the VDSL3 line.
  • the embodiment of the present invention further discloses a system, including a central office end 910 and a user end 920.
  • the central office end 910 includes a vectorization control entity 9100, wherein the vectorization control entity 9100 can be a figure.
  • the vectorized control entity described in FIG. 6 may also be the vectored control entity described in FIG.
  • the client 920 includes user front end devices CPE1, . . . , CPE K-1, CPE K.
  • the signal generated by the vectorization control entity 9100 is sent to the central office transceiver unit CO 1RX/TX, . . . , CO K-1RX/TX, CO K RX/TX, and the central office transceiver unit CO 1RX. /TX,...,CO K-1RX/TX, CO K RX/TX sends the signal to the transceiver unit CPE1RX/TX,..., CPE K-1RX/TX, CPE K RX/TX of the user's front-end equipment through the communication line.
  • an embodiment of the present invention further discloses a data communication apparatus, including a processor 1010, a memory 1020, and a bus system 1030.
  • the processor 1010 and the memory 1020 are connected by the bus system 1030.
  • the memory 1020 is used by the memory 1020.
  • the processor 1010 is configured to execute the instruction stored by the memory 1020,
  • the processor 1010 is configured to generate a first signal in the first frequency band, where the first frequency band refers to a VDSL2 frequency band, and in the second frequency band, according to the VDSL3 signal of the second frequency band and the VDSL3 line.
  • Generating a first pre-compensation signal for the crosstalk coefficient of the VDSL2 line the second frequency band refers to a VDSL3 frequency band that does not overlap with the VDSL2 frequency band, and the first pre-compensation signal is used by the user front-end equipment to receive the VDSL3 line pair
  • the out-of-band far-end crosstalk cancellation of the VDSL2 line is performed; the first signal and the first pre-compensation signal are combined into a second signal, and the second signal is sent to the VDSL2 user front-end device.
  • the processor is further configured to generate a first signal in a first frequency band, where the first frequency band refers to a VDSL2 frequency band, and the first frequency band is used to generate the first frequency band.
  • the image signal of the signal, the second frequency band refers to a VDSL3 frequency band that does not overlap with the VDSL2 frequency band; and generates a first pre-compensation signal according to the VDSL3 signal of the second frequency band and the crosstalk coefficient of the VDSL2 line to the VDSL2 line,
  • the first pre-compensation signal is used for a VDSL2 user front end device After receiving, the VDSL3 line cancels the out-of-band far-end crosstalk of the VDSL2 line; synthesizes the first signal, the first pre-compensation signal and the image signal into a second signal, and the second signal is sent to the VDSL2 user Front-end equipment.
  • the processor 1010 may be a central processing unit (“CPU"), and the processor 1010 may also be other general-purpose processors, digital signal processors (DSPs).
  • DSPs digital signal processors
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 1020 can include read only memory and random access memory and provides instructions and data to the processor 1010. A portion of the memory 1020 may also include a non-volatile random access memory. For example, the memory 1020 can also store information of the device type.
  • the bus system 1030 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as the bus system 1030 in the figure.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another The system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本发明公开了一种发送信号的方法、装置和系统，其中方法包括：将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；在第二频段根据所述第二频段的VDSL3信号和VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，第一预补偿信号用于用户前端设备接收后与所述VDSL3线路对所述VDSL2线路的带外远端串音抵消；将第一信号和第一预补偿信号合成为第二信号，将第二信号发送给VDSL2用户前端设备。本发明实施例在VDSL2的带外生成VDSL3线路对VDSL2线路的带外串扰的预补偿信号，使得VDSL2接收端的信号不包含带外远端串音。

Description

一种发送信号的方法、装置和系统 技术领域
本发明涉及通信领域，尤其涉及一种发送信号的方法、装置和系统。
背景技术
xDSL(Digital Subscriber Line，数字用户线)是一种在无屏蔽双绞线(Unshielded Twist Pair，UTP)传输的高速数据传输技术。通带传输的xDSL利用频分复用(FDM，Frequency Division Multiplexing)技术使得xDSL与传统电话业务(Plain Old Telephone Service，POTS)共存于同一对双绞线上，其中xDSL占据高频段，POTS占用4千赫兹(KHz)以下基带部分，在信号接收端，采用分离器分离POTS信号与xDSL信号。提供多路xDSL接入的系统叫做DSL接入复用器(DSL Access Multiplexer，DSLAM)。
如图1和图2所示，中心局(Central office，CO)端设备与用户前端设备(Customer Premises Equipment，CPE)之间的线路，由于电磁感应原理，DSLAM接入的多路信号之间，会相互产生干扰，称为串音(Crosstalk)。串音包括近端串音(Near-end Crosstalk，NEXT)和远端串音(Far-end Crosstalk，FEXT)，其中NEXT和FEXT能量都会随着频段升高而增强。现有的xDSL技术，如ADSL，ADSL2，ADSL2+，VDSL，VDSL2等，上下行信道采用频分复用(Frequency Division Duplexing，FDD)，NEXT对系统的性能的影响可以忽略不计，主要存在FEXT的影响，但由于xDSL使用的频段越来越宽，FEXT愈发严重地影响VDSL2的传输性能。目前业界提出，使用Vectoring技术在CO端进行联合收发来抵消FEXT。
其中，VDSL2标准定义了8种配置属性(Profile)，称为8a、8b、8c、8d、12a、12b、17a、30a，在Vector系统中也会存在多种属性的线路，但要求多种属性线路的子载波间隔相同，由于原有的30a Profile的子载波间隔是其它Profile的2倍，不能在Vector共存。为了能使30a和17a共存，目前国际标准组织ITU-T正在制定下一代的VDSL2标准，即VDSL3。其最重要的特征是定了和17a子载波间隔相同的30a线路，使得在17a线路(即属性为17a的线路)与30a线路(即属性为30a的线路)共存的情况下，在17M以内能进行正常的Vectoring抵消。然而，一方面，17a的线路在17M以外 还存在带外频谱，虽然可使用低通滤波器，但17-21MHz的带外频谱功率仍在-80dBm/Hz以上，在下行方向，在17a线路上发送信号的带外频谱会对30a线路17M以上的频率产生较强的FEXT干扰；另一方面，30a线路17M以上的频谱也会对17a线路的带外的频谱产生FEXT干扰，当17a线路接收端的调制解调器采用1倍采样时，这部分带外干扰会被混叠到17a线路的带内，使得17a线路速率降低。
在某些情况下，中心局的设备升级为VDSL3后，VDSL2CPE没有升级到VDSL3CPE，VDSL3可以向下兼容发送VDSL2信号，进行2倍采样可以消除VDSL2带外发送信号对VDSL3线路的干扰，但是VDSL3线路对VDSL2线路的带外串扰仍然存在，VDSL2CPE进行1倍采样后会对VDSL2带内形成干扰。
发明内容
本发明实施例提供了一种发送信号的方法、装置和系统，用于消除VDSL3线路对VDSL2线路的带外串扰。
第一方面，提供了一种发送信号的方法，包括：
将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
在第二频段根据所述第二频段的VDSL3信号和所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于VDSL2用户前端设备接收后与所述VDSL3线路对所述VDSL2线路的带外远端串音抵消；
将所述第一信号和所述第一预补偿信号合成为第二信号，所述第二信号发送给所述VDSL2用户前端设备。
基于第一方面，在第一方面的第一种可能实施例中，所述第一预补偿信号等于所述第二频段的VDSL3信号与所述串扰系数的乘积。
基于第一方面，在第一方面的第二种可能实施例中，所述VDSL3线路对VDSL2线路的串扰系数获取方式为：
向所述VDSL2用户前端设备发送导频序列；
接收VDSL2用户前端设备反馈的误差信号；
根据所述误差信号计算所述VDSL3线路对VDSL2线路的串扰系数。
第二方面，提供了一种发送信号的方法，包括：
将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段；
在所述第二频段根据所述第二频段的VDSL3信号以及所述VDSL3线路对所述VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音相抵消；
将所述第一信号、第一预补偿信号和镜像信号合成为第二信号，所述第二信号发送给VDSL2用户前端设备。
基于第二方面，在第二方面的第一种可能实施例中，还包括：
在所述第二频段根据所述镜像信号和所述镜像信号对所述VDSL3线路的串扰系数生成第二预补偿信号；
将VDSL3信号和所述第二预补偿信号合成为第三信号发送给VDSL3用户前端设备。
基于第二方面，在第二方面的第二种可能实施例中，所述第二频段的VDSL3信号对VDSL2线路的串扰系数获取方式为：
向VDSL2用户前端设备发送导频序列；
接收VDSL2用户前端设备反馈的误差信号；
根据所述误差信号计算所述VDSL3线路对VDSL2线路的串扰系数。
基于第二方面，在第二方面的第三种可能实施例中，所述镜像信号是所述第一信号的对称共轭信号。
第三方面，提供了一种矢量化控制实体，包括：
第一生成单元，用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
第二生成单元，用于在第二频段根据所述第二频段的VDSL3信号和所述第二频段的VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音抵消；
第三生成单元，用于将所述第一信号和所述第一预补偿信号合成为第二信号，所述第二信号发送给VDSL2用户前端设备。
基于第三方面，在第二方面的第一种可能实施例中，所述第二生成单元具体包括：
所述第二生成单元具体包括：
第一发送单元，用于向所述VDSL2用户前端设备发送导频序列；
第一接收单元，用于接收所述VDSL2用户前端设备反馈的误差信号；
第一计算单元，用于根据所述误差信号计算所述VDSL3线路对所述VDSL2线路的串扰系数。
第四方面，提供了一种矢量化控制实体，包括：
第四生成单元，用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
第五生成单元，用于在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段；
第六生成单元，用于在所述第二频段根据所述第二频段的VDSL3信号和所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音抵消；
第七生成单元，用于将所述第一信号、第一预补偿信号和镜像信号合成为第二信号，所述第二信号发送给所述VDSL2用户前端设备。
基于第四方面，在第四方面的第一种可能实施例中，还包括：
第八生成单元，用于在所述第二频段根据所述镜像信号和所述镜像信号对VDSL3线路的串扰系数生成第二预补偿信号；
第九生成单元，用于将VDSL3信号和所述第二预补偿信号合成为第三信号，所述第三信号发送给VDSL3用户前端设备。
基于第四方面，在第四方面的第二种可能实施例中，所述第六生成单元具体包括：
第二发送单元，用于向所述VDSL2用户前端设备发送导频序列；
第二接收单元，用于接收所述VDSL2用户前端设备反馈的误差信号；
第二计算单元，用于根据所述误差信号计算所述第二频段的VDSL3信 号对VDSL2线路的串扰系数。
第五方面，提供了一种系统，包括中心局端和用户端，所述中心局端包括上述的矢量化控制实体，所述用户端包括用户前端设备。。
第六方面，提供了一种数据通信装置，包括处理器、存储器和总线系统，所述处理器和所述存储器通过所述总线系统相连，所述存储器用于存储指令，所述处理器用于执行该存储器存储的指令，
其中，所述处理器用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；在第二频段根据所述第二频段的VDSL3信号和所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于用户前端设备接收后与所述VDSL3线路对所述VDSL2线路的带外远端串音抵消；将所述第一信号和所述第一预补偿信号合成为第二信号，所述第二信号发送给VDSL2用户前端设备。
第六方面，提供了一种数据通信装置，包括处理器、存储器和总线系统，所述处理器和所述存储器通过所述总线系统相连，所述存储器用于存储指令，所述处理器用于执行所述存储器存储的指令，
其中，所述处理器用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段；根据所述第二频段的VDSL3信号以及所述VDSL3线路对所述VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音相抵消；将所述第一信号、第一预补偿信号和镜像信号合成为第二信号，所述第二信号发送给所述VDSL2用户前端设备。
基于上述技术方案，本发明实施例通过将待发送数据在VDSL2频段内生成第一信号，然后在VDSL3频段内选取与VDSL2不重叠的频段根据VDSL3对VDSL2的带外串扰信号以及VDSL3线路对VDSL2线路的带外串扰抵消系数生成第一预补偿信号，所述第一预补偿信号用于用户前端设备接收后与VDSL3对VDSL2的带外远端串音相抵消，最后将所述第一信号和第一预补偿信号合成为第二信号发送给VDSL2用户前端设备。本发明实施例在VDSL2的带外生成VDSL3线路对VDSL2线路的带外串扰的预补偿信号，使得 VDSL2接收端的信号不包含带外干扰。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为远端串音示意图；
图2为近端串音示意图；
图3为本发明实施例提供的一种发送信号的方法流程图；
图4为本发明实施例提供的一种串扰估计示意图；
图5为本发明实施例提供的一种发送信号的方法流程图；
图6为本发明实施例提供的一种矢量化控制实体示意图；
图7为本发明实施例提供的一种矢量化控制实体示意图；
图8为本发明实施例提供的一种矢量化控制实体示意图；
图9为本发明实施例提供的一种系统结构示意图；
图10为本发明实施例提供的一种通信装置结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
如图3所示，本发明实施例公开了一种发送信号的方法，包括步骤：
步骤310：中心局端矢量控制化实体(Vectoring Control Entity，VCE)将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段。
本实施例中，中心局的矢量控制化实体VCE将待发送数据在VDSL2频段即0～17.6MHz频段内生成第一信号。第一信号可以理解为VDSL2的带内信号，等同于VDSL3端口退化为VDSL2端口发送VDSL2带内信号，相当于VDSL3端口在17.6～35.2MHz内不发送任何信号，只工作在0～17.6MHz的频段内。
步骤320：中心局端VCE在第二频段根据所述第二频段的VDSL3信号和 所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于用户前端设备接收后与所述VDSL3线路对所述VDSL2线路的带外远端串音抵消。
其中VDSL2频段为0～17.6MHz，VDSL3频段为0～35.2MHz，不重叠的频段为17.6-35.2MHz。本实施例中，选择17.6-35.2MHz频段生成第一预补偿信号。
用户前端设备接收到中心局端发送的信号后，第一预补偿信号与VDSL3线路对VDSL2线路的带外远端串音相抵消，等于接收到的信号只有第一信号。
如图4所示，VDSL3线路对VDSL2线路的串扰系数获得方式是：VCE向用户前端设备发送导频序列，VDSL2CPE根据VDSL3线路对VDSL2线路的干扰反馈误差。VCE根据误差反馈计算VDSL3线路对VDSL2线路的串扰系数。VCE在第二频段根据所述第二频段的VDSL3信号和所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号。
步骤330：中心局端VCE将所述第一信号和所述第一预补偿信号合成为第二信号，将所述第二信号发送给VDSL2用户前端设备。
第一信号和第一预补偿信号生成后等同于VDSL3的带内信号，中心局采用二倍采样将第二信号发送给VDSL2用户前端设备，VDSL2用户前端进行一倍采样后不会对带内信号产生影响。
本发明实施例中心局使用VDSL3端口发送VDSL2信号，同时在VDSL2的带外生成VDSL3线路对VDSL2线路带外的第一预补偿信号，使得VDSL2用户前端设备接收的VDSL2带外信号被消除，CPE侧进行一倍采样后不会对带内信号产生影响。
如图5所示，本发明实施例还公开了一种发送信号的方法，包括：
步骤510：中心局端VCE将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段。
中心局的矢量控制化实体(Vectoring Control Entity，VCE)将待发送数据在VDSL2频段即0～17.6MHz频段内生成第一信号。第一信号可以理解为VDSL2的带内信号，等同于VDSL3端口退化为VDSL2端口发送VDSL2带内信号，相当于VDSL3端口在17.6～35.2MHz内不发送任何信号，只工作在0～17.6MHz的频段内。
步骤520：中心局端VCE在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段。
优选的，镜像信号是第一信号的对称共轭信号。
步骤530：中心局端VCE在所述第二频段根据所述第二频段的VDSL3信号以及所述VDSL3线路对所述VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音相抵消。
步骤540：中心局端VCE将所述第一信号、第一预补偿信号和镜像信号合成为第二信号并发送给VDSL2用户前端设备。
还进一步包括步骤：
步骤550：在所述第二频段根据所述镜像信号和所述镜像信号对所述VDSL3线路的串扰系数生成第二预补偿信号；
步骤560：将VDSL3信号和所述第二预补偿信号合成为第三信号发送给VDSL3用户前端设备。
如图6所示，本发明实施例还公开了一种矢量化控制实体，包括：
第一生成单元610，用于将待发送数据在VDSL2频段内生成第一信号。
第一生成单元将待发送数据在VDSL2频段即0～17.6MHz频段内生成第一信号。第一信号可以理解为VDSL2的带内信号，等同于VDSL3端口退化为VDSL2端口发送VDSL2带内信号，相当于VDSL3端口在17.6～35.2MHz内不发送任何信号，只工作在0～17.6MHz的频段内。
第二生成单元620，用于在第二频段根据所述第二频段的VDSL3信号和所述第二频段的VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音抵消。
其中VDSL2频段为0～17.6MHz，VDSL3频段为0～35.2MHz，不重叠的频段为17.6-35.2MHz。本实施例中，选择17.6-35.2MHz频段生成第一预补偿信号。
本发明实施例中心局使用VDSL3端口发送VDSL2信号，同时在VDSL2的带外生成VDSL3线路对VDSL2线路带外的第一预补偿信号。VDSL2用户 前端设备接收到中心局发送的信号后，第一预补偿信号与VDSL3线路对VDSL2线路的带外远端串音抵消，等于接收到的信号只有第一信号，VDSL2CPE侧进行一倍采样后不会对带内信号产生影响。
第三生成单元630，用于用于将所述第一信号和所述第一预补偿信号合成为第二信号，将所述第二信号发送给VDSL2用户前端设备。
第一信号和第一预补偿信号生成后等同于VDSL3的带内信号，中心局采用二倍采样将第二信号发送给用户前端设备，因此不存在带外泄露信号。
所述第二生成单元620具体包括：
第一发送单元，用于向VDSL2用户前端设备发送导频序列；
第一接收单元，用于接收VDSL2用户前端设备反馈的误差信号；
第一计算单元，用于根据所述误差信号计算所述VDSL3线路对所述VDSL2线路的串扰系数。
本发明实施例使用VDSL3端口发送VDSL2信号，同时在VDSL2的带外生成VDSL3对VDSL2带外的第一预补偿信号，使得CPE侧接收的VDSL2带外信号被消除，用户端CPE进行一倍采样后不会对带内信号产生影响。
如图7所示，本发明实施例还公开了一种矢量化控制实体，包括：
第四生成单元710，用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段。其中，VDSL2频段为0～17.6MHz。第五生成单元720，用于在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段。VDSL3频段为0～35.2MHz，不重叠的频段为17.6-35.2MHz。第六生成单元730，用于在所述第二频段根据所述第二频段的VDSL3信号以及所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音抵消。第七生成单元740，用于将所述第一信号和所述第一预补偿信号合成为第二信号，将所述第二信号发送给VDSL2用户前端设备。
VDSL2用户前端设备接收到第二信号后，第一预补偿信号与VDSL3线路对VDSL2线路的带外远端串音相抵消，等于接收到的信号只有第一信号。
如图8所示，为了抵消所述第一预补偿信号对正常的VDSL3信号的干扰，图7所示的矢量化控制实体还包括：第八生成单元750，在所述第二频 段根据所述镜像信号和所述镜像信号对VDSL3线路的串扰系数生成第二预补偿信号。第九生成单元760，用于将VDSL3信号和所述第二预补偿信号合成为第三信号发送给VDSL3用户前端设备。VDSL3用户前端设备接收的VDSL3信号中包含有对镜像信号对VDSL3线路的串扰的抵消信号，抵消信号与串扰信号相互抵消，消除了镜像信号对VDSL3线路的串扰的影响。
如图9所示，本发明实施例还公开了一种系统，包括中心局端910和用户端920，所述中心局端910包括矢量化控制实体9100，其中，矢量化控制实体9100可以是图6描述的矢量化控制实体，也可以是图7描述的矢量化控制实体。所述用户端920包括用户前端设备CPE1、…、CPE K-1、CPE K。
具体的，一实施例中，矢量化控制实体9100产生的信号发送给中心局端收发单元CO 1RX/TX、…、CO K-1RX/TX、CO K RX/TX，中心局端收发单元CO 1RX/TX、…、CO K-1RX/TX、CO K RX/TX将信号通过通讯线路发送给用户前端设备的收发单元CPE1RX/TX、…、CPE K-1RX/TX、CPE K RX/TX。
如图10所示，本发明实施例还公开了一种数据通信装置，包括处理器1010、存储器1020和总线系统1030，该处理器1010和该存储器1020通过该总线系统1030相连，该存储器1020用于存储指令，该处理器1010用于执行该存储器1020存储的指令，
其中，该处理器1010用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；在第二频段根据所述第二频段的VDSL3信号和所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于用户前端设备接收后与所述VDSL3线路对所述VDSL2线路的带外远端串音抵消；将所述第一信号和所述第一预补偿信号合成为第二信号，所述第二信号发送给VDSL2用户前端设备。
另一实施例中，其中，所述处理器还用于用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段；根据所述第二频段的VDSL3信号以及所述VDSL3线路对所述VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备 接收后与VDSL3线路对VDSL2线路的带外远端串音相抵消；将所述第一信号、第一预补偿信号和镜像信号合成为第二信号，所述第二信号发送给所述VDSL2用户前端设备。
具体处理器1010的具体执行流程可以参见图3和图4所示的流程图对应的描述，这里就不再赘述。
应理解，在本发明实施例中，该处理器1010可以是中央处理单元(Central Processing Unit，简称为“CPU”)，该处理器1010还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器1020可以包括只读存储器和随机存取存储器，并向处理器1010提供指令和数据。存储器1020的一部分还可以包括非易失性随机存取存储器。例如，存储器1020还可以存储设备类型的信息。
该总线系统1030除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都标为总线系统1030。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个 系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也可以是电的，机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本发明实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分，或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (15)

  1. 一种发送信号的方法，其特征在于，包括：
    将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
    在第二频段根据所述第二频段的VDSL3信号和所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于VDSL2用户前端设备接收后与所述VDSL3线路对所述VDSL2线路的带外远端串音抵消；
    将所述第一信号和所述第一预补偿信号合成为第二信号，所述第二信号发送给所述VDSL2用户前端设备。
  2. 根据权利要求1所述的方法，其特征在于，所述第一预补偿信号等于所述第二频段的VDSL3信号与所述串扰系数的乘积。
  3. 根据权利要求1所述的方法，其特征在于，所述VDSL3线路对VDSL2线路的串扰系数获取方式为：
    向所述VDSL2用户前端设备发送导频序列；
    接收VDSL2用户前端设备反馈的误差信号；
    根据所述误差信号计算所述VDSL3线路对VDSL2线路的串扰系数。
  4. 一种发送信号的方法，其特征在于，包括：
    将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
    在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段；
    在所述第二频段根据所述第二频段的VDSL3信号以及所述VDSL3线路对所述VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音相抵消；
    将所述第一信号、第一预补偿信号和镜像信号合成为第二信号，所述第二信号发送给VDSL2用户前端设备。
  5. 根据权利要求3所述的方法，其特征在于，还包括：
    在所述第二频段根据所述镜像信号和所述镜像信号对所述VDSL3线路的串扰系数生成第二预补偿信号；
    将VDSL3信号和所述第二预补偿信号合成为第三信号发送给VDSL3用户前端设备。
  6. 根据权利要求3所述的方法，其特征在于，所述第二频段的VDSL3信号对VDSL2线路的串扰系数获取方式为：
    向VDSL2用户前端设备发送导频序列；
    接收VDSL2用户前端设备反馈的误差信号；
    根据所述误差信号计算所述VDSL3线路对VDSL2线路的串扰系数。
  7. 根据权利要求4-6任一项所述的方法，其特征在于，所述镜像信号是所述第一信号的对称共轭信号。
  8. 一种矢量化控制实体，其特征在于，包括：
    第一生成单元，用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
    第二生成单元，用于在第二频段根据所述第二频段的VDSL3信号和所述第二频段的VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音抵消；
    第三生成单元，用于将所述第一信号和所述第一预补偿信号合成为第二信号，所述第二信号发送给VDSL2用户前端设备。
  9. 根据权利要求8所述的装置，其特征在于，所述第二生成单元具体包括：
    第一发送单元，用于向所述VDSL2用户前端设备发送导频序列；
    第一接收单元，用于接收所述VDSL2用户前端设备反馈的误差信号；
    第一计算单元，用于根据所述误差信号计算所述VDSL3线路对所述VDSL2线路的串扰系数。
  10. 一种矢量化控制实体，其特征在于，包括：
    第四生成单元，用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；
    第五生成单元，用于在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段；
    第六生成单元，用于在所述第二频段根据所述第二频段的VDSL3信号和 所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音抵消；
    第七生成单元，用于将所述第一信号、第一预补偿信号和镜像信号合成为第二信号，所述第二信号发送给所述VDSL2用户前端设备。
  11. 根据权利要求10所述的装置，其特征在于，还包括：
    第八生成单元，用于在所述第二频段根据所述镜像信号和所述镜像信号对VDSL3线路的串扰系数生成第二预补偿信号；
    第九生成单元，用于将VDSL3信号和所述第二预补偿信号合成为第三信号，所述第三信号发送给VDSL3用户前端设备。
  12. 根据权利要求10或11所述的装置，其特征在于，所述第六生成单元具体包括：
    第二发送单元，用于向所述VDSL2用户前端设备发送导频序列；
    第二接收单元，用于接收所述VDSL2用户前端设备反馈的误差信号；
    第二计算单元，用于根据所述误差信号计算所述第二频段的VDSL3信号对VDSL2线路的串扰系数。
  13. 一种系统，其特征在于，包括中心局端和用户端，所述中心局端包括权利要求7-8或9-11任一项所述的矢量化控制实体，所述用户端包括用户前端设备。
  14. 一种数据通信装置，其特征在于，包括处理器、存储器和总线系统，所述处理器和所述存储器通过所述总线系统相连，所述存储器用于存储指令，所述处理器用于执行该存储器存储的指令，
    其中，所述处理器用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；在第二频段根据所述第二频段的VDSL3信号和所述VDSL3线路对VDSL2线路的串扰系数生成第一预补偿信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段，所述第一预补偿信号用于用户前端设备接收后与所述VDSL3线路对所述VDSL2线路的带外远端串音抵消；将所述第一信号和所述第一预补偿信号合成为第二信号，所述第二信号发送给VDSL2用户前端设备。
  15. 一种数据通信装置，其特征在于，包括处理器、存储器和总线系统，所述处理器和所述存储器通过所述总线系统相连，所述存储器用于存储指令， 所述处理器用于执行所述存储器存储的指令，
    其中，所述处理器用于将待发送数据在第一频段内生成第一信号，所述第一频段是指VDSL2频段；在第二频段生产所述第一信号的镜像信号，所述第二频段是指不与VDSL2频段重叠的VDSL3频段；根据所述第二频段的VDSL3信号以及所述VDSL3线路对所述VDSL2线路的串扰系数生成第一预补偿信号，所述第一预补偿信号用于VDSL2用户前端设备接收后与VDSL3线路对VDSL2线路的带外远端串音相抵消；将所述第一信号、第一预补偿信号和镜像信号合成为第二信号，所述第二信号发送给所述VDSL2用户前端设备。
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