WO2016082221A1 - Procédé, appareil et système d'envoi d'un signal - Google Patents

Procédé, appareil et système d'envoi d'un signal Download PDF

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Publication number
WO2016082221A1
WO2016082221A1 PCT/CN2014/092579 CN2014092579W WO2016082221A1 WO 2016082221 A1 WO2016082221 A1 WO 2016082221A1 CN 2014092579 W CN2014092579 W CN 2014092579W WO 2016082221 A1 WO2016082221 A1 WO 2016082221A1
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subcarrier
psd
psd mask
victim
length
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PCT/CN2014/092579
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English (en)
Chinese (zh)
Inventor
涂建平
付饶
易溪林
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华为技术有限公司
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Priority to CN201480033634.5A priority Critical patent/CN105830353B/zh
Priority to PCT/CN2014/092579 priority patent/WO2016082221A1/fr
Publication of WO2016082221A1 publication Critical patent/WO2016082221A1/fr

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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

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a method, an apparatus, and a system for signaling.
  • Crosstalk is the most common phenomenon in telephone network systems.
  • Crosstalk refers to the multi-channel signal of the same Digital Subscriber Line Access Multiplexer (DSLAM) due to the principle of electromagnetic induction. Interference occurs between each other, so that the receiving end receives signals from other lines.
  • DSLAM Digital Subscriber Line Access Multiplexer
  • the uplink channel and the downlink channel adopt a frequency division multiplexing technology, that is, the transmission of the uplink signal and the transmission of the downlink signal use different frequencies.
  • the near-end string Near-end crosstalk NEXT
  • Far-end crosstalk uses Vectoring technology to perform joint transmission and reception at the central office. To cancel, where NEXT refers to the signal sent by the receiving end of the receiving side, and FEXT refers to the signal received by the receiving end of other lines of the opposite end.
  • the same frequency duplex communication technology can be used, that is, the uplink and downlink use the same frequency range for signal transmission.
  • the NEXT effect is severe on the overlapping frequency, and the prior art method cannot be used to reduce the impact of NEXT.
  • Embodiments of the present invention provide a method, apparatus, and system for signaling to reduce the impact of NEXT.
  • a first aspect of the embodiments of the present invention provides a method for signaling, including:
  • the interfering user receives the power backoff parameter sent by the central office, where the power backoff parameter includes a range of overlapping frequencies, and the range of the overlapping frequency refers to an uplink frequency of the interfering user end.
  • a first power spectral density PSD mask of the first subcarrier according to the range of the overlapping frequency, where the first PSD mask is used to define that the interfering UE sends on the first subcarrier a maximum value of a PSD used by the uplink signal, where the first subcarrier is any subcarrier within a range of the overlapping frequency;
  • a PSD used to send an uplink signal on the first subcarrier according to a first PSD mask of the first subcarrier, where the PSD used by the first subcarrier to send an uplink signal Less than or equal to the first PSD mask of the first subcarrier.
  • the power back-off parameter further includes a second PSD mask of the first sub-carrier, where the second PSD mask is centered
  • the office indicates an upper limit value of the PSD used by the interfering UE to send an uplink signal on the first subcarrier;
  • Determining, by the interfering UE, the PSD used to send the uplink signal on the first subcarrier according to the first PSD mask of the first subcarrier including:
  • a PSD used to send an uplink signal on the first subcarrier according to a first PSD mask of the first subcarrier and a second PSD mask of the first subcarrier, where The PSD used by the first subcarrier to transmit the uplink signal is less than or equal to the second PSD mask of the first subcarrier.
  • the interfering user end acquires a first PSD mask of the first subcarrier according to the range of the overlapping frequency ,include:
  • the interfering UE Acquiring, by the interfering UE, the first PSD mask of the first subcarrier according to the power spectral density of the reference noise received by the victim UE in the downlink direction of the first subcarrier and the strength of the near end crosstalk channel mold.
  • the interfering UE Acquiring, by the interfering UE, the first PSD mask of the first subcarrier according to the power spectral density of the reference noise received by the victim UE in the downlink direction of the first subcarrier and the strength of the near end crosstalk channel Module, including:
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier, f denotes the first subcarrier, and the REFRXNPSD ds (f) represents a victim user end in the first subcarrier
  • the interfering UE Acquiring, by the interfering UE, the first PSD mask of the first subcarrier according to the power spectral density of the reference noise received by the victim UE in the downlink direction of the first subcarrier and the strength of the near end crosstalk channel Module, including:
  • OPBOMASK(f) REFRXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier, f denotes the first subcarrier, and the REFRXNPSD ds (f) represents a victim user end in the first subcarrier
  • the interfering user end acquires a first power spectral density of the first subcarrier according to the range of the overlapping frequency PSD mask, including:
  • the interfering UE is in the first according to a central office connected to the victim user end
  • the power spectral density of the reference noise transmitted in the downlink direction of the subcarrier and the strength of the near-end crosstalk channel acquire the first PSD mask of the first subcarrier.
  • the first PSD mask of the carrier includes:
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f represents the first subcarrier
  • the REFTXNPSD ds (f) represents a central office connected to the victim user end.
  • the power spectral density of the reference noise transmitted in the downlink direction of the first subcarrier, NEXTChannel(K next , f) indicates the strength of the near-end crosstalk channel
  • NEXTChannel(K next , f) 10log 10 (K next ⁇ f 3/2 )
  • K next represents the coupling coefficient of the near-end crosstalk
  • LOSS (kl 0 , f) represents the direct channel attenuation of the interfering user, Where k1 0 represents the length of the line appliance that interferes with the user end, and ⁇ represents the trimming factor that controls the magnitude of the influence of the near-end crosstalk.
  • a seventh possible implementation when the length of the line electrical device of the interfering user end is greater than or equal to the length of the line electrical appliance of the victim user end,
  • the first PSD mask of the carrier includes:
  • OPBOMASK(f) REFTXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(2kl 0,REF -kl 0 ,f)
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f represents the first subcarrier
  • the REFTXNPSD ds (f) represents a central office connected to the victim user end.
  • the interfering user end is configured according to the first subcarrier
  • the PSD mask and the second PSD mask of the first subcarrier determine a PSD used to transmit an uplink signal on the first subcarrier, including:
  • the interfering UE determines the first in the first PSD mask of the first subcarrier, the second PSD mask of the first subcarrier, and the third PSD mask of the first subcarrier. a PSD used by the subcarrier to transmit an uplink signal, where the PSD used for transmitting the uplink signal on the first subcarrier is less than or equal to a third PSD mask of the first subcarrier, where the first subcarrier is The third PSD mask represents the highest PSD initial limit used by the interfering user upstream direction in the initial channel discovery phase.
  • the interfering user end receives the power backoff parameter sent by the central office end ,include:
  • the interfering UE receives the power backoff parameter through an O-SIGNATURE message.
  • a second aspect of the embodiments of the present invention provides a device for signaling, including:
  • a receiving module configured to use a power backoff parameter sent by the central office, where the power backoff parameter includes a range of overlapping frequencies, where the range of the overlapping frequency refers to an uplink frequency of the interference user end and a downlink frequency of the victim user end The extent of overlap;
  • an acquiring module configured to acquire, according to the range of the overlapping frequency, a first power spectral density PSD mask of the first subcarrier, where the first PSD mask is used to define that the interference UE sends the first subcarrier a maximum value of a PSD used by the uplink signal, where the first subcarrier is any subcarrier within a range of the overlapping frequency;
  • a processing module configured to determine, according to the first PSD mask of the first subcarrier, the first The PSD used by the subcarrier to transmit the uplink signal, and the PSD used by the first subcarrier to transmit the uplink signal is less than or equal to the first PSD mask of the first subcarrier.
  • the power backoff parameter further includes a second PSD mask of the first subcarrier, where the second PSD mask is centered
  • the office indicates an upper limit value of the PSD used by the interfering UE to send an uplink signal on the first subcarrier;
  • the processing module is configured to determine, according to the first PSD mask of the first subcarrier and the second PSD mask of the first subcarrier, a PSD used to send an uplink signal on the first subcarrier, where And the PSD used by the uplink signal sent by the first subcarrier is less than or equal to the second PSD mask of the first subcarrier.
  • the acquiring module is specifically configured to perform, in the downlink direction of the first subcarrier, according to the victim user end A first PSD mask of the first subcarrier is acquired by a power spectral density of the received reference noise and an intensity of the near-end crosstalk channel.
  • the obtaining module is specifically used according to a formula:
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier, f denotes the first subcarrier, and the REFRXNPSD ds (f) represents a victim user end in the first subcarrier
  • the obtaining module is specifically used according to a formula
  • OPBOMASK(f) REFRXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier, f denotes the first subcarrier, and the REFRXNPSD ds (f) represents a victim user end in the first subcarrier
  • the acquiring module is specifically configured to: according to the central office end connected to the victim user end The power spectral density of the reference noise transmitted in the downlink direction of the first subcarrier and the strength of the near-end crosstalk channel acquire the first PSD mask of the first subcarrier.
  • the obtaining module is specifically used according to a formula:
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f represents the first subcarrier
  • the REFTXNPSD ds (f) represents a central office connected to the victim user end.
  • the power spectral density of the reference noise transmitted in the downlink direction of the first subcarrier, NEXTChannel(K next , f) indicates the strength of the near-end crosstalk channel
  • NEXTChannel(K next , f) 10log 10 (K next ⁇ f 3/2 )
  • K next represents the coupling coefficient of the near-end crosstalk
  • LOSS (kl 0 , f) represents the direct channel attenuation of the interfering user, Where k1 0 represents the length of the line appliance that interferes with the user end, and ⁇ represents the trimming factor that controls the magnitude of the influence of the near-end crosstalk.
  • a seventh possible implementation manner when the length of the line electrical device of the interfering user end is greater than or equal to the length of the line electrical appliance of the victim user end,
  • the obtaining module is specifically used according to a formula:
  • OPBOMASK(f) REFTXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(2kl 0,REF -kl 0 ,f)
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f represents the first subcarrier
  • the REFTXNPSD ds (f) represents a central office connected to the victim user end.
  • the processing module is specifically configured to be used according to the first subcarrier a first PSD mask, a second PSD mask of the first subcarrier, and a third PSD mask of the first subcarrier determine a PSD used to transmit an uplink signal on the first subcarrier, where The PSD used by the first subcarrier to transmit the uplink signal is less than or equal to the third PSD mask of the first subcarrier, and the third PSD mask of the first subcarrier indicates that the uplink direction of the interfering UE is initialized.
  • the receiving module is specifically configured to receive, by using an O-SIGNATURE message, Power backoff parameter.
  • a third aspect of the embodiments of the present invention provides a device for signaling, including:
  • a memory and a processor for storing code for performing a method of signaling; the processor for calling the code to perform the following operations:
  • a power backoff parameter including a range of overlapping frequencies, where the range of the overlapping frequency is a range in which the uplink frequency of the interference user end overlaps with the downlink frequency of the victim user end;
  • the modulo determines a PSD used by the first subcarrier to transmit an uplink signal, and the PSD used by the first subcarrier to transmit an uplink signal is less than or equal to a first PSD mask of the first subcarrier.
  • a fourth aspect of the embodiments of the present invention provides a signal sending system, including:
  • At least two user lines one end of each of the subscriber lines is connected to the central office end, and the other end is connected to the user end, and the user end is a victim user or interferes with the user end;
  • the interfering client is the signal transmitting device as described in any of the possible implementations of the second aspect.
  • the method, the device and the system for transmitting a signal provided by the embodiment of the present invention receive the power backoff parameter sent by the central office end by the interference user end, where the power backoff parameter includes the range of the overlapping frequency; Obtaining a first PSD mask of the first subcarrier, where the interfering UE determines, according to the first PSD mask of the first subcarrier, a PSD used to send an uplink signal in the first subcarrier, where the uplink signal is sent in the first subcarrier
  • the PSD employed is less than or equal to the first PSD mask of the first subcarrier.
  • the first subcarrier refers to any subcarrier in the overlapping frequency range, that is, the PSD used by the interfering user to transmit the uplink signal, and considers the influence of the first subcarrier in the overlapping frequency range, and the first suburb in the overlapping frequency range.
  • the PSD used to transmit the uplink signal on the carrier is limited to the range of the first PSD mask of the first subcarrier, thereby reducing the effect of NEXT.
  • Embodiment 1 is a schematic flowchart of Embodiment 1 of a method for signaling a signal according to the present invention
  • FIG. 2 is a schematic diagram of a first application scenario of a method for signaling a signal according to the present invention
  • 3a is a schematic diagram of an application scenario 2 of a method for signaling a signal according to the present invention
  • FIG. 3b is another schematic diagram of an application scenario 2 of a method for signaling a signal according to the present invention.
  • Embodiment 4 is a schematic structural diagram of Embodiment 1 of a device for signaling according to the present invention.
  • FIG. 5 is a schematic structural diagram of Embodiment 2 of a device for signaling according to the present invention.
  • the present invention receives the power backoff parameter sent by the central office end by the interference receiving end, and the power backoff parameter includes the range of the overlapping frequency, and the overlapping frequency ranges include multiple subcarriers.
  • the power backoff parameter includes the range of the overlapping frequency
  • the overlapping frequency ranges include multiple subcarriers.
  • the following embodiments use the A subcarrier is described as an example, and the subcarrier is referred to as a first subcarrier. It can be understood by those skilled in the art that the first subcarrier refers to any subcarrier in an overlapping frequency range.
  • the interfering UE obtains a first power spectral density (PSD) mask of the first subcarrier according to the range of the overlapping frequency, and the PSD used by the interfering UE to send the uplink signal in the first subcarrier is less than or equal to the above.
  • PSD power spectral density
  • the first PSD mask of the first subcarrier that is, the PSD used by the interfering UE to transmit the uplink signal on the first subcarrier, considers the influence of the first subcarrier in the overlapping frequency range, and is in the overlapping frequency range.
  • the PSD used to transmit the uplink signal on one subcarrier is limited to the range of the first PSD mask of the first subcarrier, thereby reducing the influence of NEXT.
  • the interference user terminal and the victim user terminal described in the foregoing embodiments of the present invention and the following embodiments refer to one user line in two or more user lines that are relatively close due to the principle of electromagnetic induction.
  • the transmission signal interferes with the transmission signal of another subscriber line, and the user terminal that connects the user line (which may also be the interference source) that generates the interference is called the interference user terminal, and will be connected to the interfered subscriber line.
  • the client is called the victim client.
  • Embodiment 1 is a schematic flowchart of Embodiment 1 of a method for transmitting a signal according to the present invention.
  • the execution body of this embodiment is an interference user terminal, and more specifically, a user front end device (Customer Premises Equipment, hereinafter referred to as CPE), the method of this embodiment is as follows:
  • S101 The interference client receives the power backoff parameter sent by the central office.
  • the power backoff parameter includes a range of overlapping frequencies, and the range of the overlapping frequency refers to a range in which the uplink frequency of the interference user end overlaps with the downlink frequency of the victim user end.
  • the frequency of multiple subcarriers is included in the range of overlapping frequencies.
  • the power backoff parameter is sent to the interfering UE through the O-SIGNATURE message, and accordingly, the interfering UE receives the power backoff parameter through the O-SIGNATURE message.
  • the interference UE acquires the first PSD mask of the first subcarrier according to the range of the overlapping frequency.
  • the first PSD mask is used to define a maximum value of the PSD used by the interfering UE to transmit the uplink signal on the first subcarrier.
  • the first PSD mask for acquiring the first subcarrier may have multiple acquisition manners according to the relationship between the length of the line device that interferes with the user end and the length of the line device of the victim user.
  • the present invention does not limit this.
  • the interfering UE determines, according to the first PSD mask of the first subcarrier, a PSD used to send the uplink signal on the first subcarrier.
  • the PSD used by the interfering UE to send the uplink signal on the first subcarrier is less than or equal to the first PSD mask of the first subcarrier.
  • the PSD used by the interfering UE to transmit signals on the first subcarrier must be less than or equal to the first PSD mask of the first subcarrier.
  • the power backoff parameter sent by the central office end is received by the interference user end, and the power backoff parameter includes the range of the overlapping frequency; the first PSD mask of the first subcarrier is obtained by the interference user end according to the range of the overlapping frequency.
  • the interfering UE determines, according to the first PSD mask of the first subcarrier, a PSD used for transmitting the uplink signal on the first subcarrier, where a PSD used by the first subcarrier to send an uplink signal is less than or equal to the PSD.
  • a first PSD mask of the first subcarrier is a PSD used for transmitting the uplink signal on the first subcarrier.
  • the PSD used by the user to transmit the uplink signal is considered, and the influence of the first subcarrier in the overlapping frequency range is considered, and the PSD used for transmitting the uplink signal on the first subcarrier in the overlapping range is limited to the first subcarrier.
  • the first PSD mask thereby reducing the effects of NEXT.
  • the power backoff parameter sent by the central office to the interfering UE further includes a second PSD mask of the first subcarrier, where the second PSD mask is defined by the central office according to the network management system.
  • the second PSD mask indicates that the central office indicates the upper limit of the PSD used by the interfering UE to send the uplink signal on the first subcarrier, and therefore, the interfering user is
  • the PSD used for transmitting the uplink signal on the first subcarrier satisfies the first PSD mask of the first subcarrier
  • the second PSD mask equal to or smaller than the first subcarrier is also satisfied. That is, the interfering UE determines the PSD used to transmit the uplink signal on the first subcarrier according to the first PSD mask of the first subcarrier and the second PSD mask of the first subcarrier.
  • the PSD used by the interfering UE to transmit the uplink signal on a certain first subcarrier is also affected by the third PSD mask of the first subcarrier, where the third PSD mask of the first subcarrier is masked.
  • the modulo represents the highest PSD initial limit used by the user in the upstream channel discovery phase during the initial channel discovery phase. That is, the first PSD mask of the first subcarrier, the second PSD mask of the first subcarrier, and the third PSD mask of the first subcarrier jointly determine that the interfering UE sends an uplink signal on the first subcarrier.
  • the PSD used by the first subcarrier to transmit the uplink signal may be determined according to the following formula, and the PSD used for transmitting the uplink signal by the first subcarrier is represented by CDPSDus(f).
  • the first PSD mask is denoted by OPBOMASKus
  • the second PSD mask is denoted by PSDMASKus
  • the third PSD mask is denoted by CDMAXMASKus
  • the CDPSDus(f) is determined by the minimum value of OPBOMASKus, PSDMASKus and CDMAXMASKus as follows:
  • the first mode is: the interfering UE acquires the first PSD mask of the first subcarrier according to the power spectral density of the reference noise received by the victim UE in the downlink direction of the first subcarrier and the strength of the near end crosstalk channel.
  • the second method is: the interference user acquires the first subcarrier according to the power spectral density of the reference noise transmitted in the downlink direction of the first subcarrier and the strength of the near-end crosstalk channel according to the central office connected to the victim user end.
  • First PSD mask is: the interference user acquires the first subcarrier according to the power spectral density of the reference noise transmitted in the downlink direction of the first subcarrier and the strength of the near-end crosstalk channel according to the central office connected to the victim user end.
  • the difference between the first method and the second method is that the first method involves the work of the reference noise.
  • the rate spectral density refers to the power spectral density of the reference noise received by the victim user in the downlink direction of the first subcarrier
  • the second method refers to the reference to the central office end connected to the victim user in the first subcarrier.
  • the power spectral density of the reference noise transmitted in the downstream direction.
  • FIG. 2 is a schematic diagram of a first application scenario of a signal transmission method according to the present invention;
  • the line electrical appliances of the victim end are equal in length.
  • the VTU-O to the upper VTU-R in Figure 2 is the length of the line electrical appliance of the victim end, and the VTU-O to the upper VTU-R is the length of the line electrical equipment interfering with the user end.
  • the interfering UE acquires the first PSD mask of the first subcarrier according to the power spectral density of the reference noise received by the victim UE in the downlink direction of the first subcarrier and the strength of the near end crosstalk channel,
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier, f denotes the first subcarrier, and the REFRXNPSD ds (f) represents a reference received by the victim UE in the downlink direction of the first subcarrier.
  • the coupling coefficient, ⁇ represents the fine-tuning factor that controls the magnitude of the near-end crosstalk effect. The default value is 0.
  • K next can also be customized by the user according to the actual NEXT crosstalk strength of the cable.
  • FIG. 3b is another schematic diagram of the application scenario 2 of the signal transmission method of the present invention.
  • the VTU-O to the upper VTU-R in FIG. 3a is the length of the line appliance of the victim user, and the following VTU-O
  • the VTU-R to the above is the length of the line electrical device that interferes with the subscriber end.
  • the VTU-O to the upper VTU-R in Figure 3b is the length of the line electrical component of the victim user.
  • the VTU-O below is the interference to the VTU-R above.
  • the length of the line appliance of the client, and the manner of obtaining the first PSD of the first subcarrier, are applicable to both the scenario of FIG. 3a and the scenario of FIG. 3b.
  • OPBOMASK(f) REFRXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f denotes the first subcarrier
  • the REFRXNPSD ds (f) represents a reference received by the victim UE in the downlink direction of the first subcarrier.
  • the length of the appliance; ⁇ represents the
  • REFRXNPSD ds (f) can be obtained in three ways:
  • the empirical estimation method uses a virtual noise similar to the receiving end to configure the power spectral density of the reference noise at the central office.
  • the power spectral density of the reference noise received by the victim user is generally composed of three parts, and the noise of the transmitter.
  • the white Gaussian noise on the line is generally -140dBm/Hz.
  • REFRXNPSD(f) H log(f)+TXPSD(f)-SNR(f);
  • SNR(f) represents the signal-to-noise ratio
  • Hlog(f) represents the direct channel attenuation
  • TXPSD(f) represents the transmitted power spectral density
  • the silent noise measurement method uniformly extracts N first subcarriers in the overlapping frequency range, and the victim user acquires the power spectral density of the reference noise received in the downlink direction when the N first subcarriers do not transmit signals,
  • the power spectral density of the reference noise received in the downlink direction is fed back to
  • the central office predicts each first subcarrier of the victim user in the overlapping frequency range according to the statistical rule of the power spectral density of the reference noise received in the downlink direction when the N first subcarriers do not transmit signals.
  • the central office sends the power spectral density of the reference noise received in the downlink direction of each first subcarrier to the interference user end; in order to ensure the measurement effect, when there are multiple pairs of lines, The pair of lines does not transmit signals on the N first subcarriers.
  • the length of the line electrical device that interferes with the user end is less than or equal to the length of the line electrical appliance of the victim terminal, according to the formula:
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f denotes the first subcarrier
  • the REFTXNPSD ds (f) represents that the central office connected to the victim UE is in the first subcarrier
  • the power spectral density of the reference noise transmitted in the downlink direction NEXTChannel(K next ,f) represents the strength of the near-end crosstalk channel
  • NEXTChannel(K next ,f) 10log 10 (K next ⁇ f 3/2 )
  • K next represents The coupling coefficient of the near-end crosstalk
  • LOSS(kl 0 , f) represents the direct channel attenuation of the interfering user
  • k1 0 represents the length of the line appliance that interferes with the user end
  • ⁇ represents the trimming factor that controls the magnitude of the influence of the near-end crosstalk.
  • the default value is 0.
  • K next can also be customized by the user according to the actual NEXT crosstalk strength of the cable.
  • the length of the line electrical device that interferes with the user end is greater than or equal to the length of the line electrical appliance of the victim terminal, according to the formula:
  • OPBOMASK(f) REFTXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(2kl 0,REF -kl 0 ,f)
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f denotes the first subcarrier
  • the REFTXNPSD ds (f) represents that the central office connected to the victim UE is in the first subcarrier
  • the power spectral density of the reference noise transmitted in the downlink direction NEXTChannel(K next ,f) represents the strength of the near-end crosstalk channel
  • NEXTChannel(K next ,f) 10lo g10 (K next ⁇ f 3/2 )
  • K next represents The coupling coefficient of the near-end crosstalk
  • LOSS (2kl 0, REF -kl 0 , f) indicates the direct channel attenuation of the interfering user
  • Kl 0 represents the length of the line appliance that interferes with the user end
  • kl 0, REF represents the length of the line appliance referring to the victim end
  • the length of the appliance of the reference victimized end is the equivalent length of the appliance length of
  • K next can also be customized by the user according to the actual NEXT crosstalk strength of the cable.
  • REFRXNPSD ds (f) can be obtained in the following two ways:
  • the empirical estimation method uses a virtual noise similar to the transmitting side to configure the power spectral density of the reference noise at the central office end;
  • SNR(f) represents the signal-to-noise ratio
  • Hlog(f) represents the direct channel attenuation
  • TXPSD(f) represents the transmitted power spectral density
  • the device in this embodiment includes a receiving module 401, an obtaining module 402, and a processing module 403.
  • the receiving module 401 is configured to use a power backoff parameter sent by the central office.
  • the power back-off parameter includes a range of overlapping frequencies, where the range of the overlapping frequency refers to a range in which the uplink frequency of the interfering user end overlaps with the downlink frequency of the victim user end; and the obtaining module 402 is configured to acquire the range according to the range of the overlapping frequency.
  • the processing module 403 is configured to determine, according to the first PSD mask of the first subcarrier, a PSD used for transmitting the uplink signal in the first subcarrier, where the first subcarrier is Small PSD used to send uplink signals And a first PSD mask equal to the first subcarrier.
  • the power backoff parameter further includes a second PSD mask of the first subcarrier, where the second PSD mask indicates that the interfering UE sends an uplink signal on the first subcarrier.
  • the upper limit value of the PSD is used; the processing module 403 is specifically configured to determine, according to the first PSD mask of the first subcarrier and the second PSD mask of the first subcarrier, to send an uplink signal on the first subcarrier.
  • the PSD is used, wherein the PSD used for transmitting the uplink signal on the first subcarrier is less than or equal to the second PSD mask of the first subcarrier.
  • the acquiring module 402 is specifically configured to acquire the first subcarrier according to the power spectral density of the reference noise received by the victim user in the downlink direction of the first subcarrier and the strength of the near-end crosstalk channel.
  • the first PSD mask is specifically configured to acquire the first subcarrier according to the power spectral density of the reference noise received by the victim user in the downlink direction of the first subcarrier and the strength of the near-end crosstalk channel.
  • the obtaining module 402 is specifically configured according to a formula:
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier, f denotes the first subcarrier, and the REFRXNPSD ds (f) represents a reference received by the victim UE in the downlink direction of the first subcarrier.
  • the coupling coefficient, ⁇ represents a fine-tuning factor that controls the magnitude of the near-end crosstalk effect.
  • the obtaining module 402 is specifically configured according to a formula
  • OPBOMASK(f) REFRXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f denotes the first subcarrier
  • the REFRXNPSD ds (f) represents a reference received by the victim UE in the downlink direction of the first subcarrier.
  • the near-end crosstalk affects the size of the fine-tuning factor.
  • the obtaining module 402 is specifically configured to: according to a power spectral density of a reference noise and a strength of a near-end crosstalk channel, which are sent in a downlink direction of the first subcarrier according to a central office connected to the victim user end, Obtaining a first PSD mask of the first subcarrier described above.
  • the obtaining module 402 is specifically configured according to a formula:
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f denotes the first subcarrier
  • the REFTXNPSD ds (f) represents that the central office connected to the victim user end is in the first sub
  • the coupling coefficient representing the near-end crosstalk, LOSS(kl 0 , f) indicates the direct channel attenuation of the interfering user, Where k1 0 represents the length of the line appliance that interferes with the user end, and ⁇ represents the trimming factor that controls the magnitude of the influence of the near-end crosstalk.
  • the obtaining module 402 is specifically configured according to a formula:
  • OPBOMASK(f) REFTXNPSD ds (f)-NEXTChannel(K next ,f)+LOSS(2kl 0,REF -kl 0 ,f)
  • the OPBOMASK(f) represents a first PSD mask of the first subcarrier
  • f denotes the first subcarrier
  • the REFTXNPSD ds (f) represents that the central office connected to the victim user end is in the first sub
  • the power spectral density of the reference noise transmitted in the downlink direction of the carrier, NEXTChannel(K next ,f) indicates the strength of the near-end crosstalk channel, NEXTChannel(K next ,f) 10log 10 (K next ⁇ f 3/2 ), K next
  • the coupling coefficient representing the near-end crosstalk, LOSS (2kl 0, REF -kl 0 , f) indicates the direct channel attenuation of the interfering user, Kl 0 represents the length of the line appliance that interferes with the user end, kl 0, REF represents the length of the line appliance referring to the victim end, and the length of the appliance of the reference victimized end is the equivalent length of the appliance length of at least one victim user
  • the processing module 403 is specifically configured to determine, according to the first PSD mask of the first subcarrier, the second PSD mask of the first subcarrier, and the third PSD mask of the first subcarrier.
  • a PSD used by the first subcarrier to transmit an uplink signal where the PSD used for transmitting the uplink signal on the first subcarrier is less than or equal to a third PSD mask of the first subcarrier, and the first subcarrier is used.
  • the third PSD mask represents the highest PSD initial limit used by the interfering user upstream direction in the initial channel discovery phase.
  • the receiving module 401 is specifically configured to receive the power backoff parameter by using an O-SIGNATURE message.
  • FIG. 5 is a schematic structural diagram of Embodiment 2 of a device for signaling according to the present invention.
  • the device in this embodiment includes a memory 501 and a processor 502, wherein the memory 501 is configured to store a code for performing a signal transmission method.
  • the above processor 502 is used to call the above code, and performs the following operations:
  • the power backoff parameter includes a range of overlapping frequencies, where the range of the overlapping frequency refers to a range in which the uplink frequency of the interference user end overlaps with the downlink frequency of the victim user terminal; And obtaining, by the range of the frequency, a first power spectral density PSD mask of the first subcarrier, where the first PSD mask is used to limit a maximum value of the PSD used by the interference UE to send an uplink signal on the first subcarrier, where the foregoing One subcarrier is any subcarrier in the range of the overlapping frequency; determining, according to the first PSD mask of the first subcarrier, a PSD used for transmitting an uplink signal on the first subcarrier, where the first subcarrier is The PSD used to transmit the uplink signal is less than or equal to the first PSD mask of the first subcarrier.
  • the present invention also provides an embodiment of a signal transmission system, as shown in FIG. 2, FIG. 3a and FIG. 3b, comprising: at least two subscriber lines (only two shown in FIG. 2, FIG. 3a and FIG. 3b), each of which One end of the subscriber line is connected to the central office end, and the other end is connected to the user end, and the user end is a victim user terminal or an interference user terminal; the interference user terminal is a signal transmitting device as shown in FIG. 4 or FIG. The function of the signal transmitting apparatus shown in Fig. 4 or Fig. 5.
  • the upper left end of the subscriber line is connected to the central office, the right end is connected to the victim end, the lower left end of the subscriber line is connected to the central office, and the right end is connected to the interfering user; in Figure 3a The upper left end of the subscriber line is connected to the central office, the right end is connected to the victim end, the lower left end of the subscriber line is connected to the central office, and the right end is connected to the interfering user; in Figure 3b, the upper user The left end of the line is connected to the central office, the right end is connected to the victim end, the lower left end of the subscriber line is connected to the central office, and the right end is connected to the interfering user.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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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)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé, un appareil et un système d'envoi d'un signal. Une extrémité utilisateur d'interférence reçoit un paramètre de réduction de puissance provenant d'une extrémité de central. Le paramètre de réduction de puissance comprend la plage d'une fréquence de chevauchement. Puisque l'extrémité utilisateur d'interférence obtient un premier masque PSD d'une première sous-porteuse en fonction de la plage de la fréquence de chevauchement, l'extrémité utilisateur d'interférence détermine un PSD utilisé pour envoyer un signal en liaison ascendante sur la première sous-porteuse en fonction du premier masque PSD de la première sous-porteuse. Le PSD utilisé pour envoyer le signal en liaison ascendante sur la première sous-porteuse est inférieur ou égal au premier masque PSD de la première sous-porteuse. Ainsi l'influence du NEXT est-elle réduite.
PCT/CN2014/092579 2014-11-28 2014-11-28 Procédé, appareil et système d'envoi d'un signal WO2016082221A1 (fr)

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