WO2015123815A1 - Procédé, appareil et système de traitement de signal - Google Patents

Procédé, appareil et système de traitement de signal Download PDF

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Publication number
WO2015123815A1
WO2015123815A1 PCT/CN2014/072234 CN2014072234W WO2015123815A1 WO 2015123815 A1 WO2015123815 A1 WO 2015123815A1 CN 2014072234 W CN2014072234 W CN 2014072234W WO 2015123815 A1 WO2015123815 A1 WO 2015123815A1
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WO
WIPO (PCT)
Prior art keywords
frequency band
band
signal
interfering
victim
Prior art date
Application number
PCT/CN2014/072234
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English (en)
Chinese (zh)
Inventor
潘众
董卉慎
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480000164.2A priority Critical patent/CN105191158B/zh
Priority to PCT/CN2014/072234 priority patent/WO2015123815A1/fr
Publication of WO2015123815A1 publication Critical patent/WO2015123815A1/fr

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Classifications

    • 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
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/34—Testing for cross-talk

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a signal processing method, apparatus, and system.
  • FIG 1 is a block diagram of a Digital Subscriber Line (DSL) system.
  • the digital subscriber line system includes multiple Central Office (CO) side equipment and multiple customer premises equipment (Custom Premise).
  • Equipment, CPE Customer Premise
  • a central office side device can correspond to multiple customer premises equipment.
  • the DSL modulation and demodulation technology may include a Frequency Division Duplex (FDD) method and an Overlap Spectrum Duplex (OSD) method. Among them, the spectrum and time slot of each user premises equipment in the OSD mode overlap, and the problem of Near-end Crosstalk (NEXT) is introduced.
  • FDD Frequency Division Duplex
  • OSD Overlap Spectrum Duplex
  • each CPE cannot cancel NEXT and cannot demodulate the downlink signal, which seriously affects the receiving performance on the CPE side.
  • the technical problem to be solved by the present invention is how to cancel the near-end crosstalk on the CPE side in the DSL system adopting the OSD mode.
  • the present invention provides a signal processing method, including:
  • the victim device receives the pending message from the central office side device on the inband frequency band of the victim device
  • the in-band frequency band of the victim device is a frequency band in which the victim device receives a signal sent by the central office side device and/or a frequency band in which the victim device sends a signal to the central office side device;
  • the victim device receives each of the near-end crosstalk signals from the respective interfering devices on the out-of-band frequency band of each of the interfering devices, where the victim device and the respective interfering devices belong to the user corresponding to the central office device
  • the sideband device, the outband frequency band of each of the interference devices is a frequency band preset in a frequency band other than the inband frequency band of the victim device and the inband band of the each interference device, where the victim device is The outband frequency band does not overlap with the outband frequency band of each of the interference devices, and the outband frequency band of any one of the interference devices does not overlap with the outband frequency band of other interference devices;
  • the victim device calculates respective near-end crosstalks received from the respective interfering devices on its own in-band frequency band according to the respective near-end crosstalk signals;
  • the victim device performs a near-end crosstalk cancellation process on the to-be-processed signal according to the calculated near-end crosstalk.
  • the victim device calculates, according to the respective near-end crosstalk signals, received from the respective interference devices in an in-band frequency band thereof.
  • Each near-end crosstalk including:
  • the victim device determines, according to the each image signal and the one-to-one correspondence, each signal sent by the each interference device to the central office device;
  • the victim device transmits, according to the respective signals sent by the respective interference devices to the central office side device, and from the respective interference devices to the disturbed device on an inband frequency band of the victim device.
  • a crosstalk channel transfer function is prepared to calculate the respective near-end crosstalk.
  • the victim device is based on the respective near-end crosstalk signals and the bands in the respective interference devices Determining a crosstalk channel transfer function from the respective interfering devices to the victim device on the outer frequency band, and determining each image signal sent by the respective interfering device in its own outband frequency band, including: the victim device adopts a formula o ;) * H ; (/;), determining the respective image signals; wherein, i is a positive integer greater than 1; /; is an out-of-band frequency band of the interference device i; is that the victim device is on the j a near-end crosstalk signal received by the interference device i; H ; ⁇ is a crosstalk channel transfer function from the interference device i to the victim device on the j; o;) is the interference device i
  • the victim device calculates, according to the respective near-end crosstalk signals, received from the respective interference devices in an in-band frequency band thereof.
  • Each near-end crosstalk including:
  • the victim device according to the respective near-end crosstalk signals, a crosstalk channel transfer function from the respective interfering devices to the victim device in an in-band frequency band of the victim device, and a function of the crosstalk channel at each of the interfering devices a ratio of a crosstalk channel transfer function from the respective interfering devices to the victim device in an outband band, and respective image signals transmitted by the respective interfering devices on their own outband band and the respective interfering devices Determining the respective near-end crosstalks by a one-to-one correspondence between signals transmitted in an in-band frequency band of the victim device;
  • the image signals are respectively in a one-to-one correspondence with the respective signals sent by the respective interference devices to the central office side device in the inband frequency band of the victim device.
  • the victim device performs near-end crosstalk cancellation processing on the to-be-processed signal according to the calculated near-end crosstalk. Specifically include:
  • the victim device removes an echo of the victim device in its in-band frequency band and the respective near-end crosstalk from the to-be-processed signal to obtain a downlink signal, where the downlink signal is the central office side A signal transmitted by the device to the victim device on an in-band frequency band of the victim device.
  • the victim device removes, from the to-be-processed signal, the victim device in its own band
  • the echo on the frequency band and the respective near-end crosstalks obtain a downlink signal, including:
  • the i 2 pending signal cancels the echo of the victim device in its own in-band frequency band and the respective near-end crosstalk to obtain the downlink signal;
  • R DS ) is the downlink signal;
  • n is the number of the respective interference devices, and n is a positive integer greater than 1;
  • X ra (/.) is the victim device at the /.
  • H. is that the victim device is at the /.
  • Up to its own echo channel transfer function; x ra (/.)* (/.) is the victim device at the /.
  • the echo received on; is the victim device at the /.
  • Near-end crosstalk received from the interfering device i, and R i (f 0 ) X i (f 0 )*H i (f 0 ) ; is that the interfering device i is at the /.
  • the signal transmitted on, the relationship between the presence and the presence; the image signal sent by the interference device i on the; the image signal; H ; ) is at the /.
  • a crosstalk channel transfer function from the interfering device i to the victim device; the ring is the victim device at the /.
  • the present invention provides a signal processing apparatus, including: a receiving module, a calculating module, and a canceling module;
  • the receiving module is configured to receive a to-be-processed signal from a central office-side device in an in-band frequency band of the signal processing device, where an in-band frequency band of the signal processing device is that the signal processing device receives the central office device a frequency band of the transmitted signal and/or a frequency band in which the signal processing device transmits a signal to the central office side device;
  • the receiving module is further configured to receive, according to the out-of-band frequency band of each interference device, each of the near-end crosstalk signals, where the signal processing device and the each interference device belong to the central office device a user side device, wherein the outband frequency band of each of the interference devices is a frequency band preset in a frequency band other than the inband frequency band of the signal processing device and the inband band of each of the interference devices, and the signal processing device
  • the out-of-band frequency band does not overlap with the out-of-band frequency band of each of the interference devices, and the out-of-band frequency band of any one of the interference devices does not overlap with the out-of-band frequency band of other interference devices;
  • the calculating module is connected to the receiving module, and configured to calculate, according to the respective near-end crosstalk signals, respective near-end crosstalks received from the respective interfering devices in an in-band frequency band; the eliminating module and the The receiving module is connected to the computing module, and configured to perform near-end crosstalk cancellation processing on the to-be-processed signal according to the calculated near-end crosstalk.
  • the calculating module includes: determining a submodule and a computing submodule;
  • the determining submodule is configured to determine, according to the respective near-end crosstalk signals and a crosstalk channel transfer function from the respective interference devices to the victim device on an out-of-band frequency band of each interference device, Interfering with each of the image signals transmitted by the device on its own out-of-band frequency band, the respective image signals being present with the respective signals transmitted by the respective interference devices to the central office side device on the in-band frequency band of the signal processing device a one-to-one correspondence signal;
  • the determining sub-module is further configured to: determine, according to the each image signal and the one-to-one correspondence, each signal sent by the each interference device to the central office device;
  • the calculating submodule is connected to the determining submodule, and configured to Each of the signals transmitted by the central office side device and a crosstalk channel transfer function from the respective interference devices to the signal processing device in an in-band frequency band of the signal processing device calculate the respective near-end crosstalk.
  • the determining submodule is configured to:
  • the computing module is configured to:
  • Each of the image signals is a signal that has a one-to-one correspondence with each of the signals transmitted by the respective interference devices to the central office side device in the in-band frequency band of the signal processing device.
  • the eliminating The module is also used,
  • the signal processing device has an echo on its own in-band frequency band
  • the echo of the signal processing device in its own in-band frequency band and the respective ones are eliminated from the to-be-processed signal.
  • Near-end crosstalk a downlink signal is obtained, and the downlink signal is a signal sent by the central office side device to the signal processing device in an in-band frequency band of the signal processing device.
  • the signal processing apparatus further includes a sending module, where the sending module is connected to the eliminating module, Sending a signal to the central office side device;
  • the echo of the device in its own in-band frequency band and the respective near-end crosstalk obtains the downlink signal; wherein, R. (/.) is the signal to be processed; R DS (/.) is the downlink signal; Is the in-band frequency band of the signal processing device; n is the number of the respective interfering devices, and n is a positive integer greater than 1; X ra (/.) is the transmitting module at the /.
  • the uplink signal transmitted on (/.) is the signal processing device at the /.
  • X ra (/.) * (/.) is the signal processing device at the /.
  • the echo received on; is the victim device at the /.
  • the signal transmitted on the signal is in a mapping relationship with o;); the) is an image signal transmitted by the interference device i on the fi; H ; (/.) is at the /. a crosstalk channel transfer function from the interference device i to the victim device; f; R ; (/.) is the victim device at the /.
  • the present invention provides a signal processing system, including: a central office side device, a victim device, and at least one interference device, the victim device and each interference device belonging to the central office side device Corresponding user side device;
  • the victim device is from each of the interfering devices on an out-of-band frequency band of each of the interfering devices Receiving respective near-end crosstalk signals, and calculating respective near-end crosstalks received from each of the interfering devices on the in-band frequency band of the victim device according to the respective near-end crosstalk signals, according to the respective near-ends Crosstalk performs near-end crosstalk cancellation processing on a signal to be processed received from the central office side device in its own in-band frequency band;
  • the in-band frequency band of the victim device is a frequency band in which the victim device receives a signal sent by the central office side device and/or a frequency band in which the victim device sends a signal to the central office side device;
  • the out-of-band frequency band of the interference device is a frequency band preset in a frequency band other than the in-band frequency band of the victim device and the in-band frequency band of each of the interference devices, and the out-of-band frequency band of the victim device.
  • the outband frequency bands of each of the interference devices do not overlap, and the outband frequency band of any one of the interference devices does not overlap with the outband frequency bands of other interference devices.
  • the victim device calculates, according to the each near-end crosstalk signal, the interference from each of the in-band frequency bands of the victim device
  • Each near-end crosstalk received by the device includes:
  • each of the near-end crosstalk signals and a crosstalk channel transfer function from the each interfering device to the victim device on an out-of-band frequency band of each of the interfering devices Interfering with each of the image signals transmitted by the device on its own out-of-band frequency band, the respective image signals being respective signals transmitted to the central office side device on the in-band frequency band of the victim device There is a one-to-one correspondence signal;
  • the victim device transmits, according to each of the interfering devices, respective signals sent to the central office side device, and from the each interfering device to the victim device on an inband frequency band of the victim device.
  • a crosstalk channel transfer function is calculated to calculate the respective near-end crosstalk.
  • the victim device Calculating, according to each of the near-end crosstalk signals, each of the near-end crosstalk received from each of the interfering devices on the in-band frequency band of the victim device, including:
  • the victim device according to the respective near-end crosstalk signals, a crosstalk channel transfer function from the each interfering device to the victim device on an in-band frequency band of the victim device, and each of the interferences a ratio of a crosstalk channel transfer function from the each interfering device to the victim device on an out-of-band frequency band of the device, and each of the image signals transmitted by each of the interfering devices on its own out-of-band band Determining the respective near-end crosstalks by a one-to-one correspondence between signals transmitted by the interfering devices on the in-band frequency band of the victim device;
  • the image signal is a signal that has a one-to-one correspondence with each signal sent by the interference device to the central office side device in the inband frequency band of the victim device.
  • the victim device calculates a near-end crosstalk signal received from each interference device on an out-of-band frequency band of each interference device, and calculates from each in-band frequency band of the victim device Interfering with the near-end crosstalk received by the device, and performing near-end crosstalk cancellation processing according to each near-end crosstalk processing signal, which can cancel the near-end crosstalk on the CPE side and improve the rate of the DSL system.
  • Figure 1 is a block diagram of the structure of the DSL system
  • FIG. 2 is a flow chart of a signal processing method according to an embodiment of the present invention.
  • FIG. 3 is a block diagram showing the structure of a signal processing apparatus according to an embodiment of the present invention
  • 4 is a block diagram showing the structure of a signal processing apparatus according to another embodiment of the present invention
  • FIG. 5 is a block diagram showing the structure of a signal processing apparatus according to still another embodiment of the present invention
  • FIG. 6 is a signal processing system according to an embodiment of the present invention. Block diagram of the structure. Detailed ways
  • the signal processing method mainly includes:
  • Step S110 The victim device receives the to-be-processed signal from the central office side device on the inband frequency band of the victim device.
  • the victim device and the interference device may be user premises devices that belong to the same device as the central office side device, and the victim device and the interference device have their own in-band frequency bands.
  • the spectrum and time slots of the victim device and the interference device overlap or partially overlap. Therefore, the inband bands of the victim device and the interference device may be the same or different.
  • both the victim device and the interfering device have an in-band frequency band of 150 megahertz (MHz) to 200 MHz.
  • the in-band frequency band of the victim device is 150 MHz to 200 MHz
  • the in-band frequency band of the interference device is 180MHz ⁇ 250MHz.
  • the in-band frequency band of the victim device is the frequency band in which the victim device receives the signal sent by the central office side device and/or the frequency band in which the victim device transmits the signal to the central office side device; the in-band frequency band of each interference device is the receiving center of each interference device.
  • the in-band frequency band refers to the frequency band in which the victim device or the interference device receives the signal transmitted by the central office side device, and the in-band frequency band may also be referred to as the downlink inband frequency band.
  • In-band frequency band refers to the frequency band in which the victim device or the interference device sends a signal to the central office side device.
  • the in-band frequency band may also be referred to as the uplink in-band frequency band.
  • the uplink inband band and the inband band band may be the same band or different but partially overlapping bands.
  • the uplink inband band is 0 to 50 MHz
  • the inband band is 0 to 100 MHz.
  • both the uplink inband band and the downband inband band are 0 to 100 MHz.
  • the to-be-processed signal received by the victim device in its own in-band band includes not only the central office side device itself.
  • the near-end crosstalk refers to a signal that the victim device transmits to the central office side device by the interference device received by the interference device in its own in-band frequency band.
  • the signal that the victim device really needs to demodulate is the downlink signal in the signal to be processed.
  • the victim device receives each of the near-end crosstalk signals from the respective interfering devices on the out-of-band frequency band of each interfering device, where the victim device and the interfering device belong to the central office device.
  • the out-of-band frequency bands of the respective interference devices are preset frequency bands in a frequency band other than the in-band frequency band of the victim device and the in-band frequency band of each of the interference devices, The out-of-band frequency band of the interference device does not overlap with the out-of-band frequency band of each of the interference devices, and the out-of-band frequency band of any one of the interference devices does not overlap with the out-of-band frequency band of other interference devices.
  • the victim device and each interference device divide the preset frequency band from the frequency bands other than the in-band frequency band respectively.
  • the out-of-band band of the victim device and each interfering device Moreover, the out-of-band frequency band of the victim device and the out-of-band frequency band of each interference device do not overlap, and the out-of-band frequency band of any one of the interference devices does not overlap with the out-of-band frequency band of other interference devices. Therefore, the signals received by the victim device from the respective interference devices on the out-of-band frequency bands of the respective interference devices include only the near-end crosstalk signals corresponding to the respective interference devices.
  • CPE1 is the victim device
  • CPE2 and CPE3 are the interference devices
  • the inband band of CPE1 is 0 ⁇ : LOOMHz
  • the inband band of CPE2 is 0 ⁇ 50MHz
  • CPE3 In-band frequency band 50MHz ⁇ 200MHz in the frequency band other than 0 ⁇ 200MHz
  • the out-of-band frequency band for CPE1 is 210MHz ⁇ 260MHz
  • the out-band frequency band for CPE2 is 270MHz ⁇ 320MHz, which is out-of-band for CPE3.
  • the frequency band is 330MHz ⁇ 380MHz.
  • the signal received by CPE1 from CPE2 at 270MHz ⁇ 320MHz only includes the near-end crosstalk signal corresponding to CPE2.
  • the signal received by CPE1 from CPE3 at 330MHz ⁇ 380MHz only includes the corresponding corresponding to CPE3. End crosstalk signal.
  • Step S150 The victim device calculates, according to the respective near-end crosstalk signals, respective near-end crosstalks received from the respective interference devices in its own in-band frequency band.
  • the victim device calculates, according to the respective near-end crosstalk signals, each of the near-end crosstalks received from the respective interfering devices in an in-band frequency band, including:
  • Each of the signals transmitted by the victim device to the central office side device according to the interference device, and a crosstalk channel from the respective interference device to the victim device on an inband frequency band of the victim device A transfer function that calculates each of the near-end crosstalks.
  • the victim device can determine each of the image signals according to the received near-end crosstalk signals and the determined crosstalk channel transfer functions.
  • the image signal of the interference device and the signal transmitted by the interference device to the central office side device in the inband frequency band of the victim device have a one-to-one correspondence.
  • the image signal of the interfering device is equal to the signal transmitted by the interfering device to the central office side device on the inband band of the victim device.
  • the image signal of the interfering device is equal to one-half of the signal transmitted by the interfering device to the central office side device on the in-band frequency band of the victim device.
  • the victim device can obtain each one-to-one correspondence between each image signal obtained by the solution and each image signal and each signal transmitted by each interference device to the central office side device in the in-band frequency band of the victim device.
  • the interfering device transmits each signal to the central office side device on the in-band frequency band of the victim device.
  • the victim device can obtain various signals transmitted to the central office side device on the in-band frequency band of the victim device according to the solution, and from the respective interference device to the victim device in the inband frequency band of the victim device.
  • the crosstalk channel transfer function calculates the near-end crosstalk received by the victim device from each of the interfering devices in its own in-band frequency band.
  • the victim device is equal to the interference device at the frequency.
  • the crosstalk training signal received by the device. Therefore, the victim device may first determine the training signal sent by the interference device on a certain frequency according to the training information of an interference device acquired from the central office device. The victim device can be solved according to the training signal determined by the interference device on the frequency and the crosstalk training signal received at the frequency.
  • the frequency may be an out-of-band frequency band of each interference device, or may be an in-band frequency band of the victim device.
  • the frequency is an out-of-band frequency band
  • the crosstalk channel transfer function can be obtained by dividing the crosstalk training signal received at the frequency by the crosstalk training signal transmitted on the frequency.
  • the frequency is an in-band frequency band
  • the victim device may determine, according to each out-of-band training information of each interference device acquired from the central office side device, each out-of-band training signal sent by each interference device on its own out-of-band frequency band; the victim device is in each interference device. Receiving each crosstalk training signal from each interference device in the outband frequency band; the victim device determines crosstalk from each interference device to the victim device in the outband frequency band of each interference device according to each outband training signal and each crosstalk training signal Channel transfer function.
  • the victim device may determine, according to each in-band training information of each interference device acquired from the central office side device, each in-band training signal sent by each interference device on the in-band frequency band of the victim device; Receiving each crosstalk training signal from each interfering device in its own in-band frequency band; the victim device determines, according to each in-band training signal and each crosstalk training signal, from each interfering device to the victim device in the in-band frequency band of the victim device Crosstalk channel transfer function.
  • the victim device transmits the crosstalk channel according to the respective near-end crosstalk signals and the crosstalk channel from the respective interfering devices to the victim device on an out-of-band frequency band of each interference device.
  • the victim device has determined that the in /; the interfering devices i crosstalk channel victim device transfer function H; (/;), combined with the victim device /; the interference from the near-end device i received
  • the value of the image signal o;) of the interference device i can be directly solved, and combined with the image signal o;) and the interference device i in the in-band frequency band of the victim device.
  • the mapping relationship between the signals sent to the central office side device ⁇ ; ) can be determined.
  • the victim device is based on the / that has been determined.
  • the victim device calculates, according to the respective near-end crosstalk signals, each of the near-end crosstalks received from the respective interfering devices in an in-band frequency band, including:
  • the victim device according to the respective near-end crosstalk signals, a crosstalk channel transfer function from the respective interfering devices to the victim device in an in-band frequency band of the victim device, and a function of the crosstalk channel at each of the interfering devices a ratio of a crosstalk channel transfer function from the respective interfering devices to the victim device in an outband band, and respective image signals transmitted by the respective interfering devices on their own outband band and the respective interfering devices Determining the respective near-end crosstalks by a one-to-one correspondence between signals transmitted to the central office side device in an in-band frequency band of the victim device.
  • the victim device calculates the in-band band / of the victim device based on the determined individual crosstalk channel transfer function.
  • There is a correspondence X between the signals X ; (/.) sent on it ; (/.) ))) or
  • Y i (f i ) F- l (X i (f 0 )) , where 1 is the inverse of F.
  • the formula derivation process as follows.
  • Step S170 The victim device performs near-end crosstalk cancellation processing on the to-be-processed signal according to the calculated near-end crosstalk.
  • the victim device pairs the to-be-processed signal according to the calculated each near-end crosstalk.
  • the victim device cancels an echo of the victim device in its in-band frequency band and the respective near-end crosstalk from the to-be-processed signal, to obtain a downlink signal
  • the downlink signal is a signal that the central office side device sends to the victim device on an inband frequency band of the victim device.
  • the near-end crosstalk cancellation processing of the signal to be processed by the victim device not only needs to eliminate the calculated near-end crosstalk from the signal to be processed, but also needs to be
  • the downlink signal can be obtained by canceling the echo of the victim device in its own in-band frequency band from the signal to be processed.
  • the victim device can transmit the in-band training signal in its own in-band frequency band; receive the echo signal from itself in its own in-band frequency band; and determine its own according to the in-band training signal and the echo signal.
  • the in-band training signal may be requested by the central office side device or may be customized by the victim device.
  • the victim device removes an echo of the victim device in its in-band frequency band and the respective near-end crosstalk from the to-be-processed signal, to obtain a downlink signal, including :
  • the victim device uses the formula R.
  • R. (/.) is the signal to be processed; is the downlink signal; Is the in-band frequency band of the victim device; n is the number of the respective interference devices, and n is a positive integer greater than 1; X ra (/.) is the victim device at the /.
  • H. (/.) is the victim device at the /. Up to its own echo channel transfer function
  • X ra (/.)* (/.) is the victim device at the /.
  • the echo received on; R ; (/.) is the victim device at the /.
  • Near-end crosstalk received from the interference device i, and R.(/ 0 ) Z.(/ 0 )*H.(/ 0 ) ;
  • X ; (/.) is the interference device i in the Said /.
  • the signal transmitted on the signal has a mapping relationship with 50;); the 50;) is an image signal transmitted by the interference device i on the ;; H ; (/.) is at the /.
  • a crosstalk channel transfer function from the interfering device i to the victim device; the chat is that the victim device is at the /.
  • step S110 is completed before step S130 and step S150
  • steps S170 the present invention can be implemented by S110.
  • step S130 and step S150 can be completed first and then step S110 can be completed.
  • the victim device calculates the frequency of the victim device in its own band according to the near-end crosstalk signal received from each interference device in the out-of-band frequency band of each interference device.
  • the near-end crosstalk received from each interfering device on the segment and the near-end crosstalk cancellation processing according to the respective near-end crosstalk processing signals can cancel the near-end crosstalk on the CPE side and improve the rate of the DSL system.
  • FIG. 3 is a block diagram showing the structure of a signal processing apparatus according to an embodiment of the present invention.
  • the signal processing apparatus mainly includes: a receiving module 210, a calculating module 230, and a canceling module 250.
  • the receiving module 210 is configured to receive a signal to be processed from the central office side device on an in-band frequency band of the signal processing device.
  • both the signal processing device and the interference device may be user premises devices that belong to the same device as the central office side, and the signal processing device and the interference device have their own in-band frequency bands.
  • the spectrum and time slots of the signal processing device and the interference device overlap or partially overlap. Therefore, the in-band frequency bands of the signal processing device and the interference device may be the same or different.
  • the in-band frequency bands of the signal processing device and the interference device are both 150 MHz to 200 MHz.
  • the in-band frequency band of the signal processing device is 150 MHz to 200 MHz
  • the in-band frequency band of the interference device is 180 MHz to 250 MHz.
  • the in-band frequency band of the signal processing device is a frequency band in which the signal processing device receives the signal transmitted by the central office side device and/or a frequency band in which the signal processing device transmits a signal to the central office side device; the in-band frequency band of each interference device is the receiving center of each interference device.
  • the in-band frequency band refers to a frequency band in which a signal processing device or an interference device receives a signal transmitted by a central office side device, and the in-band frequency band may also be referred to as a downlink in-band frequency band.
  • the in-band frequency band refers to a frequency band of a signal transmitted by a signal processing device or an interference device to a central office side device
  • the in-band frequency band may also be referred to as an uplink in-band frequency band.
  • the uplink inband band and the inband band band may be the same band or different but partially overlapping bands.
  • the uplink inband frequency band is 0 to 50 MHz
  • the downlink inband frequency band is 0 to 100 MHz.
  • both the uplink inband band and the inband band band are 0 ⁇ ⁇ ⁇ Since the downlink in-band frequency band of the signal processing device overlaps or partially overlaps the uplink in-band frequency band of the interference device, the to-be-processed signal received by the receiving module 210 in its own in-band frequency band includes not only the central office side device in itself.
  • the near-end crosstalk refers to a signal that the signal processing device transmits to the central office side device by the interference device received by the signal processing device in its own in-band frequency band by electromagnetic coupling.
  • the signal that the signal processing device really needs to demodulate is the downlink signal in the signal to be processed.
  • the receiving module 210 is further configured to receive, according to the outband frequency band of each interference device, each of the near-end crosstalk signals, where the victim device and the each interference device belong to the central office device
  • the user-side device, the out-of-band frequency band of each of the interference devices is a frequency band preset in a frequency band other than the in-band frequency band of the signal processing device and the in-band frequency band of each of the interference devices, and the signal processing
  • the out-of-band frequency band of the device does not overlap with the out-of-band frequency band of each of the interference devices, and the out-of-band frequency band of any one of the interference devices does not overlap with the out-of-band frequency band of other interference devices.
  • the signal processing device and the interference device divide the preset frequency band from the frequency bands except all the in-band frequency bands respectively.
  • the signal processing device and the out-of-band frequency band of each interference device As the signal processing device and the out-of-band frequency band of each interference device.
  • the out-of-band frequency bands of the signal processing device and each interference device do not overlap, and the out-of-band frequency band of any one of the interference devices does not overlap with the out-of-band frequency band of other interference devices. Therefore, the signals received by the receiving module 210 from the respective interfering devices on the out-of-band frequency bands of the respective interfering devices include only the near-end crosstalk signals corresponding to the respective interfering devices.
  • CPE1 is a signal processing device
  • CPE2 and CPE3 are interference devices
  • the in-band frequency band of CPE1 is 0 ⁇ : LOOMHz
  • the in-band frequency band of CPE2 is 0 ⁇ 50MHz
  • the out-of-band frequency band divided for CPE1 is 210MHz ⁇ 260MHz
  • the out-of-band frequency band divided by CPE2 is 270MHz ⁇ 320MHz
  • the out-of-band frequency band divided by CPE3 is 330MHz ⁇ 380MHz.
  • the signal received by CPE1 from CPE2 at 270MHz ⁇ 320MHz includes only the near-end crosstalk signal corresponding to CPE2, CPE1 is at 330MHz.
  • the signal received from CPE3 at ⁇ 380 MHz includes only the near-end crosstalk signal corresponding to CPE3.
  • the computing module 230 is coupled to the receiving module 210, and configured to calculate, according to the respective near-end crosstalk signals, respective near-end crosstalks received from the respective interfering devices in its own in-band frequency band.
  • the eliminating module 250 is connected to the receiving module 210 and the computing module 230, and configured to perform near-end crosstalk cancellation processing on the to-be-processed signal according to the calculated near-end crosstalk.
  • the calculation module calculates each of the near-end crosstalk signals received from the respective interference devices on the out-of-band frequency band of each interference device by the receiving module, and calculates the interference devices in the in-band frequency band of the signal processing device.
  • Each of the received near-end crosstalks, and the cancellation module performs near-end crosstalk cancellation processing according to the calculated near-end crosstalk processing signals, which can cancel the near-end crosstalk on the CPE side and improve the rate of the DSL system.
  • Fig. 4 is a block diagram showing the structure of a signal processing apparatus according to another embodiment of the present invention.
  • the same components as those of Fig. 3 in Fig. 4 have the same functions, and a detailed description of these components will be omitted for the sake of brevity.
  • the calculation module 230 can include a determination sub-module 231 and a calculation sub-module 233.
  • the determining sub-module 231 is configured to determine, according to the respective near-end crosstalk signals and a crosstalk channel transfer function from the respective interference devices to the signal processing device on an out-of-band frequency band of each interference device, Each image signal transmitted by each interference device on its own out-of-band frequency band, and each of the image signals is a signal transmitted to the central office side device with the respective interference devices on an in-band frequency band of the signal processing device. There is a one-to-one correspondence signal.
  • the determining submodule 231 is further configured to: according to the respective image signals and the respective image signals And determining, in a one-to-one correspondence between the signals transmitted by the respective interference devices on the in-band frequency band of the signal processing device, determining respective signals sent by the respective interference devices to the central office side device.
  • the calculation sub-module 233 is connected to the determination sub-module 231 for transmitting, according to the respective signals sent by the respective interference devices to the central office-side device, and from the in-band frequency band of the signal processing device.
  • Each of the interfering devices transmits a crosstalk channel transfer function to the signal processing device to calculate the respective near-end crosstalk.
  • the determining submodule 231 can determine each of the image signals according to the respective near-end crosstalk signals received by the receiving module 210 and the determined channel transfer functions.
  • the image signal of the interference device has a one-to-one correspondence with the signal sent by the interference device to the central office device in the inband frequency band of the signal processing device.
  • the image signal of the interfering device is equal to the signal transmitted by the interfering device to the central office side device on the in-band frequency band of the signal processing device.
  • the image signal of the interfering device is equal to one-half of the signal transmitted by the interfering device to the central office side device on the in-band frequency band of the signal processing device.
  • the determining sub-module 231 can determine, according to each image signal determined by itself, and a one-to-one correspondence between each image signal and each signal sent by each interference device to the central office side device in the in-band frequency band of the signal processing device. Each signal transmitted by each of the interfering devices to the central office side device on the in-band frequency band of the signal processing device.
  • the calculation sub-module 233 can determine, according to the determination, the respective interference signals of the respective interference devices transmitted to the central office side device on the in-band frequency band of the signal processing device, and the respective interference devices on the in-band frequency band of the signal processing device.
  • the crosstalk channel transfer function to the signal processing device calculates the near-end crosstalk received by the signal processing device from each of the interfering devices in its own in-band frequency band.
  • the signal processing device is equal to the interference from the signal processing device at the frequency.
  • the crosstalk training signal received by the device. Therefore, the determining submodule 231 may first determine the interference according to the training information of an interference device acquired from the central office side device. The training signal that the device sends on a certain frequency. The determining sub-module 231 can determine a crosstalk channel transfer function from the interference device to the signal processing device at the frequency according to the training signal determined by the interference device on the frequency and the crosstalk training signal received by the receiving module 210 on the frequency. .
  • the frequency may be an out-of-band frequency band of each interference device, or may be an in-band frequency band of the signal processing device. If the frequency is an out-of-band frequency band, then there is only one interference device on the frequency, and the determining sub-module 231 can obtain the crosstalk channel transmission by dividing the crosstalk training signal received on the frequency by the crosstalk training signal transmitted on the frequency. function. If the frequency is an in-band frequency band, there may be multiple interference devices on the frequency, and the determining sub-module 231 may separately calculate the crosstalk channel of each interference device to the signal processing device at the frequency by transmitting the crosstalk training signal in a time-sharing manner. Transfer Function.
  • the determining sub-module 231 can also calculate the crosstalk channel transfer function of each interfering device to the signal processing device by constructing an orthogonal crosstalk training signal and performing matrix inversion. For a specific example, refer to the related description in step S150 in the above embodiment 1.
  • the determining submodule 231 is configured to: adopt a formula
  • R.(/;.) * H. (/;.), determines the respective image signals.
  • i is a positive integer greater than 1; /; is an out-of-band frequency band of the interference device i; R ; (/;) is a near-end received by the signal processing device from the interference device i on the /; a crosstalk signal; is a crosstalk channel transfer function from the interference device i to the signal processing device on the /; is an image signal transmitted by the interference device i on the /;
  • the determination sub-module 231 has been determined in /; the interfering devices i crosstalk channel signal processing apparatus transfer function H; (/;), combined with the signal processing apparatus /; on from interfering devices i received nearly
  • the value of the image signal /;) of the interference device i can be directly solved, and the image signal and the interference device i are combined in the in-band frequency band of the signal processing device.
  • the mapping of the signal X ; (/.) sent to the central office side device can determine the value of (/.).
  • the calculation sub-module 233 is based on the / that has been determined.
  • Crosstalk channel that interferes with device i to the signal processing device
  • the transfer function H; (. /), Then according to the formula R; (/.) x; (/.)*) , may be determined in /.
  • the calculating module 230 is configured to: from the respective interference devices to the signal processing device on an in-band frequency band of the signal processing device according to the respective near-end crosstalk signals Ratio of a crosstalk channel transfer function to a crosstalk channel transfer function from the respective interfering device to the signal processing device on an out-of-band frequency band of each of the interfering devices, and the respective interfering devices are on their own out-of-band band
  • the respective near-end crosstalk is determined by a one-to-one correspondence between each of the transmitted image signals and the respective signals transmitted by the respective interfering devices to the central office side device in the in-band frequency band of the signal processing device.
  • the calculation module 230 calculates an in-band frequency band / in the signal processing device according to the determined respective crosstalk channel transfer functions.
  • the formula for deriving the near-end crosstalk received from the interference device i is as follows.
  • the eliminating module 250 is further configured to: if the signal processing device has an echo on its own in-band frequency band, cancel the identifier from the to-be-processed signal.
  • the echo of the signal processing device in its own in-band frequency band and the respective near-end crosstalk obtain a downlink signal.
  • the cancellation module 250 not only needs to eliminate each near-end crosstalk from the signal to be processed, but also needs to eliminate the signal processing device from the received signal to be processed.
  • the echo in its own in-band frequency band can get the downlink signal.
  • the signal processing apparatus further includes a sending module 350, where the sending module 350 is connected to the eliminating module 250, and configured to send a signal to the central office side device; Is configured to use the formula
  • the echo of the i 2 processing device in its own in-band frequency band and the respective near-end crosstalk obtains the downlink signal; wherein, R. (/.) is the signal to be processed; R DS (/.) is the downlink signal; Is the in-band frequency band of the signal processing device; n is the number of the respective interfering devices, and n is a positive integer greater than 1; X ra (/.) is the signal processing device at the /.
  • the uplink signal transmitted on (/.) is the signal processing device at the /. Up to its own echo channel transfer function; X ra (/.) * (/.) is the signal processing device at the /.
  • the echo received on; the chat is the signal processing device at the /.
  • the signal transmitted on the signal, the relationship between the presence and the presence; the image signal sent by the interference device i on the ⁇ ; is in the /. a crosstalk channel transfer function from the interference device i to the signal processing device; 2. (/.) is the signal processing device at the /.
  • the calculation module receives the near-end crosstalk signal received from each interference device on the out-of-band frequency band of each interference device by the receiving module, and calculates to receive from each interference device in the in-band frequency band of the signal processing device.
  • the near-end crosstalk is obtained, and the cancellation module performs near-end crosstalk cancellation processing according to each near-end crosstalk processing signal, which can cancel the near-end crosstalk on the CPE side and improve the rate of the DSL system.
  • FIG. 5 is a block diagram showing the structure of a signal processing apparatus according to still another embodiment of the present invention.
  • the signal processing device may be a host server having a computing capability, a personal computer PC, or a portable portable computer or terminal.
  • the specific embodiment of the present invention does not limit the specific implementation of the computing node.
  • the signal processing apparatus includes a processor 410, a communications interface 420, a memory array 430, and a bus 440.
  • the processor 410, the communication interface 420, and the memory 430 complete communication with each other through the bus 440.
  • the communication interface 420 is for communicating with a network element, wherein the network element includes, for example, a virtual machine management center, shared storage, and the like.
  • the processor 410 is for executing a program.
  • the processor 410 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • ASIC Application Specific Integrated Circuit
  • the memory 430 is used to store files.
  • the memory 430 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • Memory 430 can also be a memory array.
  • Memory 430 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.
  • the above program may be a program code including computer operating instructions. This program can be used to:
  • the in-band frequency band of the signal processing device is a frequency band in which the signal processing device receives a signal transmitted by the central office side device and/or a frequency band in which the signal processing device transmits a signal to the central office side device;
  • the out-of-band frequency band of each interference device is a frequency band preset in a frequency band other than the in-band frequency band of the signal processing device and the in-band frequency band of each of the interference devices, and the out-of-band frequency band of the signal processing device.
  • the out-of-band frequency bands of the respective interference devices do not overlap, and the out-of-band frequency bands of any one of the interference devices do not overlap with the out-of-band frequency bands of other interference devices;
  • calculating, according to the respective near-end crosstalk signals, the near-end crosstalk received from the respective interfering devices in the in-band band of the self including:
  • Each of the image signals sent on the image signal is a signal in a one-to-one correspondence with each signal sent by the respective interference devices to the central office side device in an in-band frequency band of the signal processing device;
  • a crosstalk channel transfer function is calculated to calculate the respective near-end crosstalk.
  • Each image signal transmitted by each interference device on its own out-of-band frequency band includes:
  • i is a positive integer greater than 1; /; is an out-of-band frequency band of the interference device i; is that the signal processing device receives the interference device i on the /;
  • the near-end crosstalk signal to; is a crosstalk channel transfer function from the interference device i to the signal processing device on the /; is an image signal transmitted by the interference device i on the signal.
  • calculating, according to each of the near-end crosstalk signals, each of the near-end crosstalks received from the respective interfering devices in the in-band frequency band including:
  • Each of the image signals is a signal that has a one-to-one correspondence with each of the signals transmitted by the respective interference devices to the central office side device in the in-band frequency band of the signal processing device.
  • the near-end crosstalk cancellation is performed on the to-be-processed signal according to the calculated near-end crosstalk. Processing, specifically including:
  • the signal processing device And canceling, by the signal processing device, the echo of the signal processing device in its own in-band frequency band and the respective near-end crosstalk to obtain the downlink signal, where the downlink signal is the central office side A signal transmitted by the device to the signal processing device on an in-band frequency band of the signal processing device.
  • the echo of the signal processing device in its own in-band frequency band and the interference devices in the in-band frequency band of the signal processing device are eliminated from the to-be-processed signal.
  • the near-end crosstalk of the signal processing device obtains a downlink signal, including:
  • R 0 (/.) R DS (f 0 ) + X us (/. ) ⁇ o ( / o ) + g Ri ( / . )
  • the signal processing device is eliminated from the signal to be processed
  • the echo on the in-band band and the respective near-end crosstalk obtains the downlink signal; wherein, R. (/.) is the signal to be processed; R DS (/.) is the downlink signal; Is the in-band frequency band of the signal processing device; n is the number of the respective interfering devices, and n is a positive integer greater than 1;
  • X ra (/.) is the signal processing device at the /.
  • the signal processing apparatus calculates the near-end received from each interference device in the in-band frequency band of the signal processing device according to the near-end crosstalk signal received from each interference device in the out-of-band frequency band of each interference device.
  • Crosstalk, and near-end crosstalk cancellation processing according to each near-end crosstalk processing signal can cancel the near-end crosstalk on the CPE side, and improve the rate of the DSL system.
  • Example 5 Figure 6 is a block diagram showing the structure of a signal processing system according to a fifth embodiment of the present invention.
  • the signal processing system includes: a central office side device 550, a victim device 510, and at least one interference device 530, and the victim device 510 and each interference device 530 belong to the central office side device.
  • the victim device 510 receives each near-end crosstalk signal from each of the interference devices 530 on an out-of-band frequency band of each of the interference devices 530, and according to the respective near-end crosstalk signals Calculating respective near-end crosstalks received from each of the interfering devices 530 on an in-band frequency band of the victim device 510 to derive from the central office on the own in-band frequency band according to the respective near-end crosstalk pairs
  • the to-be-processed signal received by the side device 550 performs a near-end crosstalk cancellation process.
  • the in-band frequency band of the victim device 510 is a frequency band and/or a location of the signal transmitted by the victim device 510 by the central office device.
  • the outband frequency band of each of the interference devices 530 is in an inband band other than the victim device 510 and each of the interference devices 530 Belt a frequency band preset in a frequency band other than the frequency band, the out-of-band frequency band of the victim device 510 does not overlap with the out-of-band frequency band of each of the interference devices 530, and any one of the interference devices 530 is interfered with The out-of-band band of device 530 does not overlap with the out-of-band band of other interfering devices 530.
  • the victim device 510 calculates, according to the respective near-end crosstalk signals, respective near-ends received from each of the interference devices 530 on an in-band frequency band of the victim device 510.
  • Crosstalk including:
  • the victim device 510 determines, according to the respective near-end crosstalk signals and a crosstalk channel transfer function from the each interference device 530 to the victim device 510 on an out-of-band frequency band of each of the interference devices 530.
  • Each of the interfering devices 530 transmits respective image signals on its own out-of-band frequency band, and the respective image signals are associated with each of the interfering devices 530 on the in-band frequency band of the victim device 510 toward the center.
  • Each of the signals sent by the office-side device 550 has a one-to-one correspondence; the victim device 510 determines, according to the image signals and the one-to-one correspondence, the each interference device 530 to the central office side.
  • the victim device 510 is configured according to each signal sent by the each interference device 530 to the central office side device 550, and from each of the interference devices 530 to the inband frequency band of the victim device 510.
  • the crosstalk channel transfer function of the victim device 510 calculates the respective near-end crosstalk. For a specific example, refer to the related description of step S150 in the above embodiment 1.
  • the victim device 510 calculates, according to the respective near-end crosstalk signals, respective near-ends received from each of the interference devices 530 on an in-band frequency band of the victim device 510.
  • Crosstalk including:
  • the victim device 510 performs a crosstalk channel transfer function from the each interference device 530 to the victim device 510 on the in-band frequency band of the victim device 510 according to the respective near-end crosstalk signals and a ratio of crosstalk channel transfer functions from each of the interfering devices 530 to the victim device 510 on an out-of-band frequency band of each interfering device 530, and each of the interfering devices 530 transmitting on its own out-of-band band Determining each of the near-end crosstalks by a one-to-one correspondence between each of the image signals and a signal transmitted by each of the interfering devices 530 on the in-band frequency band of the victim device 510; wherein the respective image signals There is a signal that has a one-to-one correspondence with each of the signals transmitted by the interfering device 530 to the central office side device 550 on the in-band frequency band of the victim device 510.
  • step S150 for a specific example, reference may be made to the related description of step S150 in the above
  • the victim device calculates the near-end crosstalk signal received from each interference device on the out-of-band frequency band of each interference device, and calculates that the victim device receives from each interference device in its own in-band frequency band.
  • the near-end crosstalk is obtained, and the near-end crosstalk cancellation processing is performed according to each near-end crosstalk processing signal, which can cancel the near-end crosstalk on the CPE side and improve the rate of the DSL system.
  • the computer software product is typically stored in a computer readable storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the present invention.
  • the foregoing storage medium includes a USB flash drive, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviation: ROM), a random access memory (English: Random Access Memory, abbreviation: RAM), a magnetic disk or an optical disk, and the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

La présente invention concerne un procédé, un appareil et un système de traitement de signal, le procédé de traitement de signal comprenant les opérations suivantes : un dispositif perturbé reçoit, d'un dispositif côté bureau central, sur une bande de fréquences dans la bande de celui-ci, un signal à traiter; le dispositif perturbé reçoit, de différents dispositifs de perturbation, sur des bandes de fréquences hors bande des différents dispositifs de perturbation, différents signaux de diaphonie d'extrémité proche, à la fois le dispositif perturbé et les différents dispositifs de perturbation appartenant à un dispositif côté utilisateur correspondant au dispositif côté bureau central; le dispositif perturbé calcule, selon les différents signaux de diaphonie d'extrémité proche, différentes diaphonies d'extrémité proche, reçues des différents dispositifs de perturbation, sur la bande de fréquences dans la bande du dispositif perturbé lui-même; le dispositif perturbé effectue, selon les différentes diaphonies d'extrémité proche calculées, un traitement d'élimination de diaphonie d'extrémité proche sur le signal à traiter. Le procédé, l'appareil et le système de traitement de signal du présent mode de réalisation peuvent compenser une diaphonie d'extrémité proche au niveau d'un côté CPE et améliorer la vitesse d'un système DSL.
PCT/CN2014/072234 2014-02-19 2014-02-19 Procédé, appareil et système de traitement de signal WO2015123815A1 (fr)

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