WO2008113280A1 - Procédé de détermination et dispositif correspondant, ainsi que procédé de configuration et système correspondant, destinés au bruit virtuel de référence dans dsl - Google Patents

Procédé de détermination et dispositif correspondant, ainsi que procédé de configuration et système correspondant, destinés au bruit virtuel de référence dans dsl Download PDF

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Publication number
WO2008113280A1
WO2008113280A1 PCT/CN2008/070410 CN2008070410W WO2008113280A1 WO 2008113280 A1 WO2008113280 A1 WO 2008113280A1 CN 2008070410 W CN2008070410 W CN 2008070410W WO 2008113280 A1 WO2008113280 A1 WO 2008113280A1
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WO
WIPO (PCT)
Prior art keywords
noise
receiving end
subcarrier
reference virtual
actual
Prior art date
Application number
PCT/CN2008/070410
Other languages
English (en)
French (fr)
Inventor
Ruzhou Feng
Jun Zhou
Jianhua Liu
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP08715146A priority Critical patent/EP2120348B1/en
Priority to AT08715146T priority patent/ATE500664T1/de
Priority to DE602008005273T priority patent/DE602008005273D1/de
Publication of WO2008113280A1 publication Critical patent/WO2008113280A1/zh
Priority to US12/562,845 priority patent/US8553847B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/46Monitoring; Testing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/32Reducing cross-talk, e.g. by compensating
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046Determination of how many bits are transmitted on different sub-channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M11/00Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/022Channel estimation of frequency response
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals

Definitions

  • the present invention relates to a Digital Subscriber Line (DSL) technology, and in particular, to a DSL reference virtual noise determining method and apparatus, a configuration method and a system.
  • DSL Digital Subscriber Line
  • DSL technology is a high-speed transmission technology for data transmission over a telephone twisted pair, Unshielded Twist Pair (UTP), including Asymmetrical Digital Subscriber Line (ADSL), very high speed digital Very-high-bit-rate Digital Subscriber Line (VDSL), Integrated Services Digital Network (ISDN)-based ISDN Digital Subscriber Line (IDSL), single-pair high-speed digital subscriber line ( Single-pair High-bit-rate Digital Subscriber Line (SHDSL), Asymmetric Digital Subscriber Line 2 (ADSL2), second-generation asymmetric digital subscriber line (Asymmetrical Digital Subscriber Line 2plus) , ADSL2plus), second-generation high-speed digital subscriber line (Very-high-bit-rate Digital Subscriber Line 2, VDSL2).
  • ADSL Asymmetrical Digital Subscriber Line
  • VDSL Very-high-bit-rate Digital Subscriber Line
  • ISDN Integrated Services Digital Network
  • IDSL Integrated Services Digital Network
  • SHDSL Single-pair High-bit-rate Digital Subscriber Line
  • ADSL2
  • DSL with passband transmission utilizes frequency division multiplexing technology to enable DSL and traditional telephone services (Platform Old Telephone Service, POTS).
  • POTS Plan Old Telephone Service
  • the electromagnetic interference between pairs will cause the signals on one pair of twisted pairs to affect the signals on the other pair of twisted pairs, that is, crosstalk.
  • the rate is getting higher and higher, and the spectrum range is getting wider and wider.
  • VDSL2 the line rate is up to 200Mbps in both directions, and the spectrum range is up to 40MHz.
  • the spectral range causes VDSL2 to be sensitive to noise coupled between cable crosstalk and radio frequency interference (RFI).
  • RFID radio frequency interference
  • the Virtual Noise scheme is one of the ways to improve line stability.
  • a transmitter reference virtual noise (TXREFVN) is pre-configured at the transmitting end of the DSL, and TXREFVN is transmitted to the receiving end during the DSL training process, and the receiving end can obtain the attenuation characteristic Hlog(f) of each subcarrier during the training process. And calculate the reference virtual noise at the receiving end.
  • the receiving end takes the actual noise of the receiving end obtained in the training process and the reference virtual noise of the receiving end to take the maximum value, and then determines the allocated bits and gains on each subcarrier, thereby ensuring that each subcarrier is possessed after the DSL line is activated. Higher noise margin, able to resist possible noise interference and improve line stability.
  • the inventors have found through research that in the prior art, the virtual noise is manually set according to the expected maximum crosstalk condition, and the set value may not conform to the actual operation, and the existence exists. If the virtual noise is too large or too small, if the setting is too large, the overhead will be too large, resulting in performance loss. If the setting is too low, the actual noise will not protect the line.
  • a method and a device for determining a DSL reference virtual noise are provided to improve the accuracy of a reference virtual noise.
  • a method and a system for configuring a DSL reference virtual noise are provided, and an accurate reference is configured. Virtual noise to improve the line stability of the DSL.
  • the reference virtual noise is determined according to the actual noise of the receiving end of the acquired subcarrier.
  • the apparatus for determining DSL reference virtual noise includes: an actual noise acquiring module and a reference virtual noise determining module,
  • the actual noise acquisition module is configured to obtain actual noise of the receiving end of the DSL subcarrier, and provide data related to actual noise of the receiving end of the subcarrier to the reference virtual noise determining module;
  • the reference virtual noise determining module is configured to determine reference virtual noise according to the data according to data from the actual noise acquiring module.
  • a reference virtual noise determining apparatus configured to acquire actual noise of the receiving end on the DSL subcarrier, and determine reference virtual noise according to actual noise of the receiving end on the subcarrier;
  • a line template module configured to configure a reference virtual noise parameter of the DSL according to the reference virtual noise provided by the reference virtual noise determining device.
  • the reference virtual noise is determined according to the actual noise of the receiving end of the acquired subcarrier.
  • the actual noise of the receiving end on each subcarrier of the DSL is obtained by using the preset actual condition, and the actual noise of the receiving end on each subcarrier is determined according to the obtained or different subcarriers.
  • Reference virtual noise; then the reference virtual noise parameters of the DSL are configured using the determined reference virtual noise.
  • the reference virtual noise can be adjusted according to the actual noise of the receiving end of each subcarrier on the DSL line, thereby improving the accuracy of the reference virtual noise.
  • the configuration of the reference virtual noise can be made more accurate and reasonable, and can adapt to the noise variation on the line, thereby improving the stability of the line.
  • FIG. 1 is an exemplary flowchart of a DSL reference virtual noise configuration method according to an embodiment of the present invention.
  • 2 is an exemplary structural diagram of a DSL reference virtual noise determining apparatus in an embodiment of the present invention.
  • FIG. 3 is an exemplary structural diagram of a DSL reference virtual noise configuration system according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a DSL reference virtual noise configuration method according to Embodiment 1 of the present invention.
  • Fig. 5 is a structural diagram showing the inside of an actual noise acquisition module in the DSL reference virtual noise determining apparatus according to the first embodiment of the present invention.
  • FIG. 6 is a flowchart of a method for configuring a DSL reference virtual noise according to a second embodiment of the present invention.
  • 7 is an actual noise acquisition in a DSL reference virtual noise determining apparatus according to a second embodiment of the present invention; Take the internal structure diagram of the module.
  • FIG. 8 is a flowchart of a DSL reference virtual noise configuration method according to Embodiment 3 of the present invention.
  • Figure 9 is a block diagram showing the internal structure of an actual noise acquisition module in a DSL reference virtual noise determining apparatus according to a third embodiment of the present invention.
  • the actual noise of the receiving end on one or more sets of DSL subcarriers is obtained; and the reference virtual noise is determined according to the actual noise of the receiving end on each acquired subcarrier. For example: selecting the actual noise maximum value of the receiving end on the corresponding subcarrier from the actual noise of the receiving end on each of the obtained subcarriers, and obtaining the corresponding subordination according to the actual noise maximum value of the receiving end on each selected subcarrier.
  • the receiving end of the carrier refers to the virtual noise; and/or, the actual noise of the receiving end on the corresponding subcarrier is selected from the actual noise of the receiving end on each acquired subcarrier, according to the selected subcarriers
  • the actual noise maximum value at the receiving end and the attenuation characteristics of each subcarrier obtained during the training process are obtained, and the reference virtual noise of the transmitting end of the corresponding subcarrier is obtained.
  • the transmitting end reference virtual noise parameter of the DSL is configured, or the receiving end reference virtual noise is used to configure the receiving end reference virtual noise parameter of the DSL.
  • FIG. 1 is an exemplary flowchart of a DSL reference virtual noise configuration method according to an embodiment of the present invention. As shown in Figure 1, the process includes the following steps:
  • Step 101 Acquire actual noise of the receiving end on each subcarrier of one or more groups of DSLs.
  • the actual noise of the receiving end on a group of subcarriers may be obtained in a single time, or The actual noise of the receiving end on multiple sets of subcarriers is monitored multiple times or in a certain period of time. For example, there are at least three ways:
  • the first method pre-enables the On-Line Reconfiguration (OLR) feature, and sets the monitoring time.
  • OLR On-Line Reconfiguration
  • collects the parameters of each subcarrier after the online reconfiguration adjustment and uses the collected reconfiguration.
  • the adjusted parameters of each subcarrier and the parameters of each subcarrier obtained during the training process are calculated, and the actual noise of the receiving end on each subcarrier of the DSL is obtained by calculation.
  • OLR is defined in the DSL standard. When the line condition or the external noise environment changes slowly, the DSL is allowed to automatically adjust the current configuration parameters without dropping the line to ensure that the DSL can still maintain good performance and stability.
  • OLR features mainly include: Bit swapping (Bit) Swapping, BS); Dynamic Rate Repartition (DRR); Seamless Rate Adaptation (SRA).
  • the BS refers to reallocating bits (Bi, 0 ⁇ i ⁇ number of subcarriers) and gain (Gi, 0 ⁇ i ⁇ subcarriers) on each subcarrier according to the current signal to noise ratio on each subcarrier. ), ie, Bi and Gi are adjusted, but the total rate ( ⁇ Lp) remains unchanged, where Lp is the p-th delay channel carried in each physical media Dependent (sublayer), PMD symbol.
  • DRR refers to the redistribution of the bits of each delay channel according to the current signal-to-noise ratio on each subcarrier, that is, the adjustment of Lp, but the total rate ( ⁇ Lp) remains unchanged
  • SRA refers to the current The signal-to-noise ratio on the subcarriers, reallocating the bits of each delay channel, that is, adjusting Lp, and adjusting the bits and gain of each subcarrier. In other words, adjusting Bi and Gi, the total rate ( ⁇ Lp) occurs. Variety.
  • the OLR feature allows the DSL to adjust the number of bit bearers and the transmit power on each subcarrier within a certain range according to the change of the line condition and the preset target noise margin during the activation process, thereby adapting to the line noise variation. Maintain the stability of the line. In turn, the OLR adjustments also reflect changes in noise on the line. Therefore, by collecting the parameters adjusted by the OLR and the parameters of each subcarrier obtained during the training process, the magnitude of the line noise at this time, that is, the actual noise of the receiving end of each subcarrier can be calculated. Through the statistics of a period of time (ie, preset monitoring time), the maximum noise value of the actual noise of the receiving end of each subcarrier on the line can be obtained. According to the maximum noise value, the reference virtual noise can be determined, and the DSL reference virtual noise parameter is configured by using the determined reference virtual noise, thereby ensuring the activated DSL line noise margin and resisting possible noise interference.
  • the parameters of each subcarrier collected include: power spectral density of each subcarrier, signal to noise ratio margin, and allocated bits; parameters of each subcarrier obtained during the training include: attenuation characteristics of each subcarrier.
  • the collected parameters of each subcarrier include: a signal to noise ratio margin of each subcarrier, an allocated bit and a gain; parameters of each subcarrier obtained during the training include: attenuation characteristics and reference power of each subcarrier Spectral density.
  • the second method pre-set the re-training monitoring time, or the number of re-training; collect the parameters of each sub-carrier after training in the re-training monitoring time, or the number of re-training times; calculate the parameters of each sub-carrier collected
  • the actual noise of the receiving end on each subcarrier of the DSL is obtained by calculation.
  • the receiving end measures the channel characteristics and obtains the channel.
  • the attenuation characteristic Hlog(i) of each subcarrier and the actual noise Actual-Received_Noise(f) at the receiving end thereby calculating the signal-to-noise ratio SNR(i) of each subcarrier, and calculating the allocated bits of each subcarrier ( Bi, 0 ⁇ i ⁇ number of subcarriers) and gain (Gi, 0 ⁇ i ⁇ number of subcarriers).
  • the transmitting end and the receiving end exchange parameters with each other through standard modulation methods and protocols, and obtain Bi, Gi, Hlog(i), etc. at the receiving end, and can calculate the actual noise at the receiving end. .
  • the maximum noise value of the actual noise at the receiving end of each subcarrier on the line can be obtained.
  • the reference virtual noise can be determined, and the reference virtual noise parameter of the DSL is configured by using the determined reference virtual noise, thereby ensuring the noise margin of the activated DSL line and resisting possible noise interference.
  • the collected parameters of each subcarrier after training may include: a power spectral density of each subcarrier, a signal to noise ratio margin, an allocated bit and an attenuation characteristic; and the collected parameters of each subcarrier after training are also
  • the method may include: a signal to noise ratio margin of each subcarrier, an allocated bit, a gain, an attenuation characteristic, and a reference power spectral density.
  • the third method pre-set the double-end test DELT times; within the DELT times, from the DELT test results, the actual noise at the receiving end of each subcarrier of the DSL is obtained.
  • the DELT feature is entered into the Loop Diagnostic mode during DSL training, and the output of the DELT includes the static noise QLN on the line ( i) equal parameters, the static noise is the actual noise of the receiving end on the corresponding subcarrier of DSL.
  • the maximum noise value of the actual noise at the receiving end of each subcarrier on the line can be obtained.
  • the reference virtual noise can be determined, and the reference virtual noise parameter of the DSL is configured by using the determined reference virtual noise, thereby ensuring the noise tolerance of the activated DSL line and resisting possible noise interference.
  • the above three methods may also be used in combination, for example, combining any two of them, or combining the above three.
  • Determining the reference virtual noise according to the actual noise of the receiving end on each acquired subcarrier includes:
  • Step 102 Determine, according to the actual noise of the receiving end on each acquired subcarrier, on the corresponding subcarrier. The actual noise maximum at the receiving end.
  • the actual noise recording table of the receiving end may be preset, and optionally, the receiving end actually The noise recording table allows the actual noise of the receiving end on each subcarrier obtained by the plurality of groups to be stored, so that the actual noise of the receiving end on each subcarrier of the DSL obtained in step 101 can be directly stored in the actual noise recording table of the receiving end.
  • the actual noise maximum value of the receiving end on each subcarrier is obtained.
  • the actual noise value of the receiving end on each acquired subcarrier may be stored in the actual noise recording table of the receiving end.
  • the actual noise value of the receiving end is compared, and the larger value of the two is retained in the actual noise recording table of the receiving end, so that the receiving end of each subcarrier in the actual noise recording table of the receiving end is finally retained.
  • the actual noise is the maximum value of the actual noise at the receiving end on each subcarrier of the DSL.
  • the actual noise second largest value of the receiving end on the corresponding subcarrier may be selected from the actual noise of the receiving end on the multiple sets of subcarriers obtained in step 101, as the receiving end on which the reference virtual noise is calculated.
  • Actual noise in this step 102, the actual noise of the receiving end of the multiple sets of subcarriers acquired in step 101 may be weighted on the corresponding subcarrier, and the actual noise weighting value of the receiving end of the corresponding subcarrier is obtained, as a calculation. Refer to the actual noise at the receiving end on which the virtual noise is based.
  • Step 103 Obtain a reference virtual reference of the corresponding subcarrier according to the actual noise maximum value of the receiving end on each selected subcarrier and the attenuation characteristic of each subcarrier obtained in the training process, or an adjustment coefficient, or a combination of the two. Noise; and/or, according to the selected actual noise maximum value and the adjustment coefficient on each subcarrier, the reference virtual noise of the receiving end of the corresponding subcarrier is obtained.
  • the reference virtual noise of the transmitting end and/or the reference virtual noise of the receiving end may be determined according to actual needs.
  • RZR £ ⁇ W(/) is adjusted, where "can be any value, the unit is dB," and the default value is 0dB.
  • the receiving end of the corresponding subcarrier is obtained.
  • the Actual_Received_Noise(i) in this step corresponds to the actual noise second largest value and the weighted value respectively at the receiving end.
  • Step 104 Configure the reference virtual noise parameter by using the obtained reference virtual noise, and perform retraining activation.
  • the reference virtual noise is usually configured by the line template. If the reference virtual noise is determined in step 103, the reference virtual noise is used to configure the DSL transmitter reference virtual noise parameter; if it is determined in step 103 The reference virtual noise of the receiving end is used to configure the reference virtual noise parameter of the DSL by using the obtained reference virtual noise.
  • the step 103 and the step 104 may further include: performing an update process on the obtained reference virtual noise, and determining the updated reference virtual noise as the current reference virtual noise, that is, the reference virtual noise to be configured this time.
  • the reference virtual noise that needs to be configured may be determined according to the reference virtual noise that is configured last time and the currently obtained reference virtual noise. For example, the reference virtual noise and the currently obtained reference may be used.
  • the virtual noise is linearly combined to obtain updated reference virtual noise.
  • One of the situations is shown below:
  • RXREFVN ⁇ i) newp ⁇ * RXREFVN ⁇ i) oldp + ( ⁇ - ⁇ RXREFVNi ) new ;
  • TXREFVNlp ⁇ * TXREFVNii) oldp + ( ⁇ - ⁇ TXREFVN(i) new .
  • RXREFVNij and TXREFVN (i ew is the reference virtual noise obtained in step 103, RXREFVNij) oldp and TXREFVN (i, oldp is the reference virtual noise of the previous configuration, RXREFVNQL P and the dish / ⁇ are required to be configured
  • the reference virtual noise is the adjustment factor. If 0, the new reference virtual noise does not take into account the previous virtual reference noise.
  • the sending end is a user end, and the receiving end is a central office; or the sending end is a central office, and the receiving end is a user end.
  • step 104 may be omitted, and the step is omitted.
  • FIG. 1 is a flowchart of a method for determining a reference virtual noise of a DSL transmitting end according to the present invention. In practical applications, only the actual noise of the receiving end on a set of DSL subcarriers can be obtained, and the actual noise maximum value of the receiving end of the corresponding subcarrier is the actual noise of the receiving end obtained by the group.
  • the DSL transmitting end reference virtual noise configuration method and the determining method are described in detail in the embodiment of the present invention.
  • the DSL reference virtual noise determining apparatus in the embodiment of the present invention is described in detail below.
  • Fig. 2 is an exemplary structural diagram of a DSL reference virtual noise determining apparatus in an embodiment of the present invention. As shown in the solid line portion of Figure 2, the apparatus includes: an actual noise acquisition module and a reference virtual noise determination module, wherein:
  • the actual noise acquisition module is configured to obtain actual noise of the receiving end on each subcarrier of the multiple sets of DSL, and provide data related to the actual noise of the receiving end on each acquired subcarrier to the reference virtual noise determining module.
  • the data that is provided by the actual noise acquiring module to the reference virtual noise determining module may be the actual noise of the receiving end on each acquired subcarrier, or may be the receiving end of each acquired subcarrier.
  • the actual noise-processed data, the processed data such as the maximum value of the actual noise at the receiving end, which is obtained within a certain time or a predetermined number of times.
  • the actual noise acquisition module may also obtain only the actual noise of the receiving end on a set of DSL subcarriers, and provide the actual noise of the receiving end on each acquired subcarrier to the reference virtual noise determining module.
  • a reference virtual noise determining module configured to determine reference virtual noise according to the actual noise of the receiving end on each subcarrier acquired by the actual noise acquiring module.
  • the reference virtual noise determining module may have multiple implementation forms when implemented. One of them can be:
  • the reference virtual noise determination module includes:
  • a first reference virtual noise determining module configured to select, from the actual noise of the receiving end on each acquired subcarrier, an actual noise maximum value of the receiving end on the corresponding subcarrier, according to the receiving end of each selected subcarrier
  • the actual noise maximum value and the attenuation characteristics of each subcarrier obtained during the training process determine the reference virtual noise of the transmitting end of the corresponding subcarrier.
  • a second reference virtual noise determining module configured to obtain actual noise from the receiving end on each of the acquired subcarriers
  • the actual noise maximum value of the receiving end on the corresponding subcarrier is selected in the sound, and the reference virtual noise of the receiving end of the corresponding subcarrier is determined according to the actual noise maximum value of the receiving end on each selected subcarrier.
  • the actual noise of the receiving end on each subcarrier of the obtained DSL is a group, the actual noise of the receiving end of the group may directly be the actual noise maximum value of the receiving end.
  • the foregoing two modules may also select the actual noise second largest value of the receiving end on the corresponding subcarrier from the actual noise of the receiving end on each acquired subcarrier, or on the acquired subcarriers.
  • the actual noise at the receiving end is weighted on the corresponding subcarrier, and the actual noise weighting value of the receiving end of the corresponding subcarrier is obtained. If the actual noise of the receiving end of each subcarrier of the DSL is a group, the actual noise of the receiving end of the corresponding subcarrier is the actual noise of the receiving end obtained by the group.
  • the reference virtual noise determining module may further include: a virtual noise updating module, configured to perform update processing on the determined reference virtual noise, and use the updated reference virtual noise as reference virtual noise of the re-determined subcarrier.
  • a virtual noise updating module configured to perform update processing on the determined reference virtual noise, and use the updated reference virtual noise as reference virtual noise of the re-determined subcarrier.
  • the update process can also be a linear combination of the previously configured reference virtual noise and the currently obtained reference virtual noise to obtain updated reference virtual noise, one of which is shown below:
  • RXREFVN ⁇ i) newp ⁇ * RXREFVN ⁇ i) oldp + ( ⁇ - ⁇ RXREFVNi ) new ;
  • TXREFVNlp ⁇ * TXREFVNii) oldp + ( ⁇ - ⁇ TXREFVN(i) new .
  • RXREFVNij and TXREFVNd are reference virtual noise obtained by the second reference virtual noise determining module and the first reference virtual noise determining module according to the actual noise maximum value, RXREFVNij) oldp and TXREFVN (i, oldp is the reference virtual noise of the previous configuration) , RXREFVNQL P and / / / The reference virtual noise to be configured for this time, is the adjustment factor. If 0, the new reference virtual noise does not consider the previous virtual reference noise.
  • the apparatus may further include: a parameter configuration module, configured to acquire reference virtual noise determined by the reference virtual noise determining module, and use the reference virtual noise to reference virtual noise parameter of the DSL Configure it.
  • the reference virtual noise obtained is the reference virtual noise of the transmitting end, and/or the reference virtual noise of the receiving end.
  • the apparatus may further include: an initialization module,
  • the actual noise acquisition condition is configured, and the actual noise acquisition condition includes at least one of the following: enabling an online reconfiguration feature, and setting a monitoring time; performing heavy training, and setting a re-training time or a re-training number; Perform a DELT test and set the number of tests.
  • the actual noise acquisition module performs the operation of acquiring the actual noise of the receiving end on each subcarrier of one or more groups of DSL according to the actual noise acquisition condition configured by the initialization module.
  • FIG. 3 is an exemplary structural diagram of a DSL reference virtual noise configuration system according to an embodiment of the present invention. As shown in FIG. 3, the system includes: a reference virtual noise determining device and a line template module.
  • the reference virtual noise determining apparatus is configured to acquire actual noise of the receiving end on each subcarrier of the multiple groups of DSL, determine the reference virtual noise according to the actual noise of the receiving end on each acquired subcarrier, and determine the reference virtual noise. Provided to the line template module. In practical applications, the reference virtual noise determining apparatus may also obtain only the actual noise of the receiving end on a set of DSL subcarriers, and determine the reference virtual noise according to the obtained actual noise of the receiving end on each subcarrier, and determine the determined The reference virtual noise is provided to the line template module.
  • the reference virtual noise determining apparatus may determine that the specific implementation form of the reference virtual noise may be multiple according to the actual noise of the receiving end on each acquired subcarrier. For example, the actual noise of the receiving end on the corresponding subcarrier may be selected from the actual noise of the received subcarriers, or the second largest value, or the actual noise of the receiving end on each subcarrier is in the corresponding sub-carrier.
  • the weighting calculation is performed on the carrier to obtain the weighted value of the actual noise of the receiving end of the corresponding subcarrier, and then the reference virtual noise is determined by using the selected determined maximum value, or the next largest value, or the weighted value.
  • the actual noise of the receiving end on each subcarrier of the obtained DSL is a group
  • the actual noise of the receiving end of the group can be directly used as the actual noise of the receiving end to determine the reference virtual noise.
  • the reference virtual noise determining device in the system shown in FIG. 3 may be identical to the description of the device shown in FIG. 2, except that the device does not include a parameter configuration module, and the function of the parameter configuration module is completed by a line template module external to the device.
  • the line template module is configured to configure the reference virtual noise parameter of the DSL according to the reference virtual noise provided by the reference virtual noise determining device.
  • relevant parameters may be collected according to the DSL running condition, and the true receiving end noise size on the DSL line is obtained according to the collected related parameters, so as to be reasonably confirmed
  • the reference virtual noise size is determined to ensure that the reference virtual noise setting is reasonable and effective, thereby improving the line stability.
  • FIG. 4 is a flowchart of a method for determining a DSL reference virtual noise according to a first embodiment of the present invention. As shown in Figure 4, the process includes the following steps:
  • Step 401 enable the OLR feature, and activate the DSL.
  • a smaller value such as -140dBm/, can be configured. Hz, etc.
  • Step 402 monitoring the DSL operation.
  • the monitoring time can be set in advance.
  • Step 403 When the line condition changes, the OLR function is triggered to adjust the line parameters, and the adjusted related parameters are collected.
  • the adjusted relevant parameters may include: power spectral density of each subcarrier (3 ⁇ 4 ⁇ (0, 0 ⁇ i ⁇ number of subcarriers), signal to noise ratio margin (SVRM(0, 0 ⁇ i ⁇ subcarriers) Number), allocated bits (Bi, 0 ⁇ i ⁇ number of subcarriers) and gain (Gi, 0 ⁇ i ⁇ number of subcarriers), etc.
  • the transmitting end can directly obtain the above-mentioned modulated related parameters .
  • Step 404 Calculate the actual noise level of the receiving end at each time on each subcarrier.
  • 3 ⁇ 4 ⁇ (0 is the power spectral density of the ith subcarrier in dBm/Hz; ⁇ ) is the attenuation characteristic of the ith subcarrier obtained during the training, in dB;
  • SVRM() is the first The signal-to-noise ratio margin of i subcarriers, in dB;
  • Bi is the bit allocated for the i-th subcarrier, the unit of Bix3 is dB;
  • Gi is the gain of the i-th subcarrier, in dB;
  • MR£F3 ⁇ 4 ⁇ () The reference power spectral density of the ith subcarrier obtained during the training, in dBm/Hz.
  • the actual noise level at the receiving end can be calculated by the following formula:
  • the actual noise level at the receiving end can be calculated by the following formula:
  • max ⁇ is a function that takes the maximum value
  • is SNR GAP, which is a constant 9.75dB
  • H ⁇ og(i) 0 ⁇ i ⁇ number of subcarriers, which are the subcarriers obtained during the training process.
  • the transmitting end refers to the virtual noise; RXREFVN ⁇ i), 0 ⁇ i ⁇ the number of subcarriers, and refers to the virtual noise for the receiving end of each subcarrier.
  • 3 ⁇ 4 ⁇ (0 is the power spectral density of the ith subcarrier in dBm/Hz; H ⁇ og(i) is the attenuation characteristic of the ith subcarrier obtained during training, in dB; SVRM(0 The signal-to-noise ratio margin of the i-th subcarrier, in dB; Bi is the allocated bit of the i-th subcarrier, the unit of Bix3 is dB; Gi is the gain of the i-th subcarrier, the unit is dB; TXREFVN (i ) refer to the virtual noise of the transmitting end of the i-th subcarrier in dBm/Hz; refer to the virtual noise of the receiving end of the i-th subcarrier, in units of dBm/Hz; MR £"3 ⁇ 4/) (0 is obtained during training) The reference power density of the ith subcarrier, in dBm/Hz.
  • Step 405 Compare the current actual noise calculated in step 404 with the actual noise obtained before, and save the larger noise value according to the comparison result.
  • the current actual noise obtained in step 404 is compared with the value in the actual noise recording table, and is in the table. Save a large noise value. If the actual noise is obtained for the first time, the actual noise result of each subcarrier is directly saved in the table.
  • the actual noise recording table of the receiving end is two, and the values retained in step 404 are respectively corresponding to the actual noise records. The table is compared.
  • Step 406 it is judged whether the monitoring is finished, if it is finished, step 407 is performed; otherwise, it can be returned Go back to step 402.
  • the monitoring time is set, when the monitoring time is reached, the monitoring ends.
  • Step 407 Read the maximum value of the actual noise at the receiving end, and calculate the reference virtual noise according to the maximum value of the actual noise of the received receiving end.
  • the actual noise value of the receiving end can be directly read from the actual noise recording table of the receiving end, that is, The maximum value of the actual noise at the receiving end.
  • TXREFVN TXREFVN ( ⁇ Adjust, where (X can be any value, the unit is dB, and the default value of a is 0 dB. Accordingly, TXREFVNf ⁇ is the reference reference virtual noise on the i-th subcarrier, which is the reception on the i-th subcarrier.
  • the reference reference virtual noise is in dBm/Hz; Actual _ Re ceived _ Noise is the actual noise maximum value of the receiving end on the i-th subcarrier, the unit is dBm/Hz; i log( ) is the i-th obtained during the training process.
  • Step 408 Configure a reference virtual noise parameter of the DSL according to the calculated reference virtual noise.
  • the virtual noise parameter of the DSL receiving end may be configured according to the TM ⁇ N( ), 0 ⁇ i ⁇ subcarrier number obtained in step 407, and then the retraining activation may be performed, and the execution step is returned. 402.
  • step 408 it can also be obtained according to step 407: T ⁇ Ff ( ) and RXREFVN ) ? 0 ⁇ i ⁇ number of subcarriers, respectively configure the reference virtual noise at the transmitting end and the reference virtual noise at the receiving end.
  • the configuration process refers to the above.
  • step 405 may also be: storing the current actual noise obtained in step 404. If a receiving actual noise recording table is set in the system in advance, the current actual noise obtained in step 404 is stored in the actual noise recording table every time OLR occurs. When the maximum value of the actual noise of the receiving end is obtained in step 407, the maximum value of the actual noise of the receiving end can be selected from the actual noise recording table.
  • step 408 may be omitted.
  • FIG. 4, which is omitted after step 408, is a flowchart of a method for determining reference virtual noise of the DSL transmitting end in the present invention.
  • the DSL reference virtual noise configuration method and the determining method in the first embodiment of the present invention are described in detail.
  • the following describes the DSL reference virtual noise determining apparatus in the first embodiment of the present invention.
  • FIG. 5 is an internal structural diagram of an actual noise acquisition module in the DSL reference virtual noise determining apparatus according to the first embodiment of the present invention.
  • the actual noise acquisition module may specifically include: an adjustment parameter acquisition module, an actual noise calculation module, and a storage module.
  • the parameter obtaining module is configured to: when the online reconfiguration feature OLR is enabled, acquire parameters of each subcarrier after the line parameter is adjusted by triggering the OLR function due to the line change, and the obtained parameter is obtained.
  • the parameters are provided to the actual noise calculation module.
  • An actual noise calculation module is configured to calculate, according to parameters of each subcarrier provided by the parameter acquisition module, and parameters of each subcarrier obtained in the training process, calculate actual noise of the receiving end on each subcarrier of the DSL, and calculate The actual noise at the receiving end is provided to the storage module for storage.
  • the storage module is configured to store actual noise of the receiving end on each subcarrier provided by the actual noise acquiring module.
  • the actual noise of the receiving end stored in the storage module may be the actual noise of the receiving end provided by the actual noise calculating module, or may be the actual noise of the current receiving end provided by the actual noise calculating module and the actual noise of the previously stored receiving end.
  • the receiving end has a large actual noise value.
  • the reference virtual noise determining module is configured to obtain, from the storage module, a real noise maximum value of the receiving end on each subcarrier, and determine a reference virtual noise according to the obtained actual noise maximum value of the receiving end.
  • Specific embodiment 2 In this embodiment, the method 2 described in the process step 101 shown in FIG. 1 is used.
  • FIG. 6 is a flowchart of a DSL reference virtual noise configuration method according to Embodiment 2 of the present invention. As shown in Figure 6, the process includes the following steps:
  • Step 601 monitoring the DSL operation.
  • the number of trainings can be set, the DSL motion can be monitored within the training times, and the DSL can be retrained; or the monitoring time can be set, and the DSL is run during the monitoring time. Monitoring, including monitoring the activation of DSL, collecting relevant parameters, etc.
  • Step 602 Perform "heavy training" on the DSL line, and collect relevant parameters after the training.
  • the relevant parameters after training may include: power spectral density of each subcarrier (3 ⁇ 4 ⁇ (0, 0 ⁇ i ⁇ number of subcarriers), signal to noise ratio margin (SVRM(0, 0 ⁇ i ⁇ subcarriers) Number), allocated bits (Bi,
  • the sending end acquires relevant parameters after training from the receiving end.
  • Step 603 Calculate the actual receiving noise level at each time on each subcarrier.
  • the SVRM in the relevant parameters in step 602 (0, 0 ⁇ i ⁇ the number of subcarriers, which is the actual signal to noise ratio Quantity, the actual noise level at the receiving end can be calculated by the following formula:
  • the actual noise level at the receiving end can also be calculated by the following formula:
  • is SNRGAP, which is a constant 9.75dB; H ⁇ g(i), 0 ⁇ i ⁇ number of subcarriers, which is the attenuation characteristic of each subcarrier obtained during training; MREFPSDii, 0 ⁇ i ⁇ number of subcarriers, The reference power spectral density of each subcarrier obtained during training.
  • 3 ⁇ 4 ⁇ (0 is the power spectral density of the i-th subcarrier in dBm/Hz; H ⁇ og(i) is the attenuation characteristic of the i-th subcarrier obtained during training, in dB; SVRM(0 The signal-to-noise ratio margin for the i-th subcarrier, in dB; Bi is the allocated bit of the i-th subcarrier, the unit of Bix3 is dB; Gi is the gain of the i-th subcarrier, in dB; MR£F3 ⁇ 4 ⁇ () is the reference power spectral density of the ith subcarrier obtained during training, in dBm/Hz.
  • step SVR in the relevant parameters in 602 (0, 0 ⁇ i ⁇ number of subcarriers, which is the signal to noise ratio margin after considering the virtual noise.
  • the actual noise level at the receiving end can be calculated by the following formula:
  • the actual noise level at the receiving end can be calculated by the following formula:
  • max ⁇ is a function that takes the maximum value
  • is SNRGAP, which is a constant of 9.75 dB
  • MREFPSDii 0 ⁇ i ⁇ number of subcarriers, which is the reference power spectral density of each subcarrier obtained during training; TXMFVN( ), 0 ⁇ i ⁇ number of subcarriers, reference virtual noise of the transmitting end of each subcarrier ;
  • RXREFVNii) 0 ⁇ i ⁇ number of subcarriers, reference virtual noise for the receiving end of each subcarrier.
  • PSD(i) is the power spectral density of the ith subcarrier in dBm/Hz
  • H ⁇ og(i) is the attenuation characteristic of the ith subcarrier obtained during training, in dB
  • SVRM(0) The signal-to-noise ratio margin of the i-th subcarrier, in dB
  • Bi is the allocated bit of the i-th subcarrier, the unit of Bix3 is dB
  • Gi is the gain of the i-th subcarrier, the unit is dB
  • TXREFVN (i ) refer to the virtual noise of the transmitting end of the i-th subcarrier in dBm/Hz
  • MR £"3 ⁇ 4/) (0
  • Step 604 Compare the current actual noise obtained in step 603 with the actual noise obtained before, and save the larger noise value according to the comparison result.
  • an actual noise record table of the receiving end is saved in the system in advance, after each training, the current actual noise obtained in step 603 is compared with the value in the noise record table, and saved in the table. Large noise value. If the actual noise is obtained for the first time, the actual noise results of each subcarrier are directly saved in the table.
  • the actual noise recording table of the receiving end is two, and the respective values retained in step 404 are respectively corresponding to the actual values.
  • the noise record table is compared.
  • Step 605 Determine whether the monitoring ends. If yes, execute step 606; otherwise, return to step 601.
  • the monitoring time if the monitoring time is set, the monitoring ends when the monitoring time is reached; if the number of heavy trainings is set, the monitoring ends when the number of heavy trainings is reached.
  • Step 606 Read the maximum value of the actual noise at the receiving end, and calculate the reference virtual noise according to the maximum value of the actual noise of the received end.
  • a physical noise recording table of the receiving end is set in the system in advance, and in step 604, each time the actual noise value of the receiving end is stored in the actual noise recording table of the receiving end, in this step, The stored actual noise value of the receiving end can be directly read from the actual noise recording table at the receiving end, that is, the maximum value of the actual noise at the receiving end.
  • the attenuation characteristic of the subcarrier, "for the adjustment factor, can be determined according to the empirical value", to adjust TXREFVN ( ⁇ , where "can be any value, the unit is dB," the default value is 0dB.
  • TXREFVNf ⁇ is the reference reference virtual noise on the i-th subcarrier, which is the reference virtual noise of the receiver on the i-th subcarrier, in units of dBm/Hz; Actual_Received_Noise) is on the i-th subcarrier.
  • Step 607 Configure a reference virtual noise parameter of the DSL according to the calculated reference virtual noise.
  • the reference noise reference parameter of the DSL is configured, and then the retraining activation is performed, and the process returns to step 601.
  • step 604 may further be: storing the current actual noise obtained in step 603. If a receiving actual noise recording table is set in the system in advance, the current actual noise obtained in step 603 is stored in the actual noise recording table every time OLR occurs. Then, in step 606, when the maximum value of the actual noise of the receiving end needs to be obtained, the maximum value of the actual noise of the receiving end can be selected from the actual noise recording table.
  • step 607 may be omitted, and FIG. 6 after step 607 is omitted, which is a flowchart of a method for determining reference virtual noise of the DSL transmitting end in the present invention.
  • FIG. 7 is a structural diagram of the internal part of the actual noise acquisition module in the DSL reference virtual noise determining apparatus according to the second embodiment of the present invention.
  • the actual noise acquisition module may specifically include: a training parameter acquisition module, an actual noise calculation module, and a storage module.
  • the training parameter obtaining module is configured to obtain parameters of each subcarrier after training in a preset condition, and provide the obtained parameter to an actual noise calculation module.
  • the actual noise calculation module is configured to calculate actual noise of the receiving end on each subcarrier of the DSL according to the parameters of each subcarrier provided by the training parameter obtaining module, and provide the calculated actual noise of the receiving end to the storage module for storage.
  • the storage module is configured to store actual noise of the receiving end on each subcarrier provided by the actual noise acquiring module.
  • the actual noise of the receiving end stored in the storage module may be the actual noise of the receiving end provided by the actual noise calculating module, or may be the actual noise of the current receiving end provided by the actual noise calculating module and the actual noise of the previously stored receiving end.
  • the receiving end has a large actual noise value.
  • the reference virtual noise determining module is configured to obtain the actual noise maximum value of the receiving end on each subcarrier according to the record stored in the storage module, and determine the reference virtual module according to the obtained actual noise maximum value of the receiving end.
  • the third method described in the process step 101 shown in FIG. 1 is used.
  • FIG. 8 is a flowchart of a DSL reference virtual noise configuration method according to Embodiment 3 of the present invention. As shown in Figure 8, the process includes the following steps:
  • Step 801 performing a DELT test.
  • the number of times the DELT test is performed can be set in advance.
  • Step 802 directly obtain the actual noise of the receiving end on each subcarrier from the test result of the DELT.
  • the actual noise (QLN(i), 0 ⁇ i ⁇ number of subcarriers) on each subcarrier of the receiving end is directly output, where QLN(i), 0 ⁇ i ⁇ the number of subcarriers, That is, the actual noise of the receiving end on each subcarrier, and the receiving end will output the current subcarriers in the DELT test result.
  • the actual noise at the receiving end is sent to the transmitting end.
  • Step 803 Compare the current actual noise obtained in step 802 with the actual noise obtained before, and save the larger noise value according to the comparison result.
  • the transmitting end compares the current actual noise obtained in step 802 with the value in the actual noise recording table after each DELT test. And save a large noise value in the table. If the actual noise is obtained for the first time, the actual noise results of each subcarrier are directly saved in the table.
  • Step 804 Determine whether the preset DELT times are reached. If yes, go to step 805; otherwise, go back to step 801.
  • Step 805 Read the maximum value of the actual noise at the receiving end, and calculate the reference virtual noise according to the maximum value of the actual noise of the received end.
  • a receiving end actual noise recording table is set in the system in advance, and in step 803, each time the larger actual receiving end actual noise value is stored in the receiving end actual noise recording table, in this step,
  • the stored actual noise value of the receiving end can be directly read from the actual noise recording table at the receiving end, that is, the maximum value of the actual noise at the receiving end.
  • TXREFVNf ⁇ is the transmit reference noise on the i-th subcarrier
  • RXMFVN if) is the reference reference virtual noise on the i-th subcarrier, in dBm/Hz
  • Actual _ Re ceived _ Noise(i) is The actual noise maximum value of the receiving end on the i-th subcarrier, in dBm/Hz
  • i log( ) is the attenuation characteristic of the i-th subcarrier obtained during the training, in dB.
  • Step 806 configuring reference virtual noise of the DSL according to the calculated reference virtual noise.
  • step 806 according to the obtained in step 805: r ⁇ N (0, 0 ⁇ i ⁇ subcarriers
  • r ⁇ N (0, 0 ⁇ i ⁇ subcarriers
  • the reference noise reference parameter of the DSL can also be configured according to the RXREFVN) obtained in step 805, 0 ⁇ i ⁇ the number of subcarriers, and then the re-training activation can be performed, and the process returns to step 801.
  • step 806 the transmitter reference virtual noise and the receiver reference virtual noise are respectively configured according to TXREFVN( ) and RXREFVN( ) obtained in step 805, and the configuration process refers to the above.
  • step 803 may also be: storing the current actual noise obtained in step 802. If a receiving actual noise recording table is set in the system in advance, the current actual noise obtained in step 802 is stored in the actual noise recording table every time OLR occurs. Then, when the maximum value of the actual noise of the receiving end is obtained in step 805, the maximum value of the actual noise of the receiving end can be selected from the actual noise recording table.
  • step 806 may be omitted, and FIG. 8 after step 806 is omitted, which is a flowchart of determining a reference virtual noise of the DSL transmitting end in the present invention.
  • the DSL reference virtual noise configuration method and the determining method in the third embodiment of the present invention are described in detail.
  • the following describes the DSL reference virtual noise determining apparatus in the third embodiment of the present invention.
  • FIG. 9 is a structural diagram of the internal of the actual noise acquisition module in the DSL reference virtual noise determining apparatus according to the third embodiment of the present invention.
  • the actual noise acquisition module may specifically include: a DELT result acquisition module, an actual noise determination module, and a storage module.
  • the DELT result acquisition module is configured to obtain the test result of the DELT, and provide the obtained DELT test result to the actual noise determination module.
  • the actual noise determining module is configured to obtain the actual noise of the receiving end on each subcarrier of the DSL from the DELT test result provided by the DELT result obtaining module, and provide the obtained actual noise of the receiving end to the storage module for storage.
  • a storage module configured to store actual noise at the receiving end of each subcarrier provided by the actual noise determining module Sound.
  • the actual noise of the receiving end stored in the storage module may be the actual noise of the receiving end provided by the actual noise calculating module, or may be the actual noise of the current receiving end provided by the actual noise calculating module and the actual noise of the previously stored receiving end.
  • the actual noise at the receiving end is a large value.
  • the reference virtual noise determining module is configured to obtain, according to the record stored by the storage module, the actual noise maximum value of the receiving end on each subcarrier, and determine the reference virtual noise according to the obtained actual noise maximum value of the receiving end.
  • the configuration system in the above three specific embodiments may be identical to the description in the system shown in FIG.
  • the method in the foregoing three specific embodiments may be consistent with the description in FIG. 1.
  • the obtained reference virtual noise may be used to perform an update process, and the updated reference noise is determined as the current reference virtual noise. This is the reference virtual noise that needs to be configured this time.
  • the reference virtual noise of the previous configuration and the reference virtual noise obtained this time can be linearly combined to obtain updated reference virtual noise, as follows:
  • RXREFVN ⁇ i) newp ⁇ * RXREFVN ⁇ i) oldp +( ⁇ - ⁇ RXREFVNi) new ;
  • TXREFVi p ⁇ * TXREFVi + ( ⁇ _ TXREFVi
  • RXREFVNiP and TXREFVNii are the reference virtual noises obtained from the actual noise maximum
  • RXREFVN, oldp and TXREFVN ⁇ T) oldp are the reference virtual noises of the previous configuration.
  • TM ⁇ (0 and ⁇ ⁇ (0 is the reference virtual noise to be configured for this time. It is the adjustment factor. If it is 0, the new reference virtual noise does not consider the previous virtual reference noise.
  • TXREFVN(i) Actual _ Re ceived _ Noise(i) - H log(/') + a Substitute the formula used for the update process
  • TXREFVN(i) newp ⁇ * TXREFVN(i) oldp +( ⁇ - ⁇ TXREFVN(i) new , the updated transmit reference noise on the i-th subcarrier:
  • TXREFVN(i) newp ⁇ * TXREFVN ⁇ i) oldp +(1 ⁇ )* TXREFVN(i) new
  • TXREFVN(i) newp ⁇ * TXREFfi * TXREFVNij) oldp + ⁇ - ⁇ Actual _ Re ceived _ Noise(i) + b, where i/log(), 0 ⁇ i ⁇ number of subcarriers, for the training process Attenuation of each subcarrier obtained in Characteristic, "for the adjustment factor, can be determined according to the empirical value",
  • Integrity where "can be any value, the unit is dB," the default value is OdB.
  • Actual _ Re ceived _ Noise(i) is the statistical result of the actual noise at the receiving end on the ith subcarrier, such as the maximum value of the actual noise at the receiving end, in dBm/Hz; i log( ) is the number obtained during the training.
  • the attenuation characteristic of i subcarriers, in dB; is an adjustment parameter or offset parameter, the unit is dB, which means a parameter corresponding to the margin added on the current basis, indicating the noise basis in the current statistics. Increase the margin of dB.
  • the updated reference noise of the receiver on the i-th subcarrier is:
  • RXREFVN(i) mw ⁇ * RXREFVN(i) oldp + (1 - ) * RXREFVN(i) mw
  • RXREFVN(i) new ⁇ * RXREFfi * TXREFVN ) oldp + ⁇ - ⁇ Actual Re ceived _ Noise(i) + b 2
  • dB an adjustment parameter or offset parameter, in dB, which means Based on the addition of a parameter equivalent to the margin, indicating an increase of 6 2 dB margin based on the current statistical noise.
  • the statistical result of the actual noise of the receiving end and the currently configured reference virtual noise can be linearly combined to obtain updated reference virtual noise, and the updated reference virtual noise is determined as the reference virtual noise currently required to be configured.
  • the reference virtual noise determining module may further include: a virtual noise update module, configured to perform update processing by using the determined reference virtual noise, and update The processed reference virtual noise is determined as the reference virtual noise of the current corresponding subcarrier.
  • the update process can also be a linear combination of the previously configured reference virtual noise and the reference virtual noise obtained this time to obtain updated reference virtual noise, as follows:
  • RXREFVN ⁇ i) newp ⁇ * RXREFVN ⁇ i) oldp + ( ⁇ - ⁇ RXREFVNi ) new ; for the sender reference virtual
  • RXREFVNd and TXREFVNii are the reference virtual noise obtained from the actual noise maximum
  • RXREFVN oldp and TXREFVN ⁇ T) oldp are before Sub-configuration reference virtual noise
  • TM ⁇ (0 and ⁇ ⁇ (0 is the reference virtual noise to be configured for this time. It is the adjustment factor. If it is 0, the new reference virtual noise does not consider the previous virtual reference noise.
  • the statistical result of the actual noise of the receiving end and the currently configured reference virtual noise may be linearly combined to obtain updated reference virtual noise, and the updated reference virtual noise is determined as the reference virtual noise currently required to be configured, specifically The process will not be described again.
  • the system or device in the foregoing embodiments may be software stored on a non-volatile storage medium, or may be hardware carrying software functions, may be loaded in a central office xDSL transceiver, or loaded on a client-side xDSL transceiver. Medium, or host system loaded on the authority side xDSL transceiver, or loaded in the system that manages the client xDSL transceiver.

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Description

DSL参考虚拟噪声的确定方法及装置、 配置方法及系统 本申请要求于 2007 年 3 月 20 日提交中国专利局、 申请号为 200710086910.6、 发明名称为" DSL 参考虚拟噪声的确定方法及装置、 配置方 法及系统"; 于 2007年 8月 15日提交中国专利局、申请号为 200710142516.X、 发明名称为" DSL参考虚拟噪声的确定方法及装置、配置方法及系统,,的中国专 利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及数字用户线 (Digital Subscriber Line, DSL )技术, 尤其涉及 DSL参考虚拟噪声的确定方法及装置、 配置方法及系统。
背景技术
DSL技术是一种通过电话双绞线,即无屏蔽双绞线( Unshielded Twist Pair, UTP )进行数据传输的高速传输技术, 包括非对称数字用户线(Asymmetrical Digital Subscriber Line, ADSL ), 甚高速数字用户线 ( Very-high-bit-rate Digital Subscriber Line, VDSL )、 基于综合业务数字网 (Integrated Services Digital Network, ISDN ) 的用户数字线( ISDN Digital Subscriber Line, IDSL )、 单线 对高速数字用户线( Single-pair High-bit-rate Digital Subscriber Line, SHDSL )、 第二代非对称数字用户线(Asymmetrical Digital Subscriber Line 2, ADSL2 )、 扩展频段的第二代非对称数字用户线 (Asymmetrical Digital Subscriber Line 2plus , ADSL2plus )、 第二代甚高速数字用户线 (Very-high-bit-rate Digital Subscriber Line 2, VDSL2 )等。
在各种数字用户线技术 ( xDSL ) 中, 除了 IDSL和 SHDSL等基带传输的 DSL 夕卜, 釆用通带传输的 DSL利用频分复用技术使得 DSL与传统电话业务 ( Plain Old Telephone Service, POTS )共存于同一对双绞线上, 其中 DSL占 据高频段, POTS占用 4KHz以下基带部分, POTS信号与 DSL信号通过分离 /整合器 (Splitter )进行分离或合并。
由于 DSL所使用的双绞线各线对之间是非屏蔽的, 线对间的电磁干扰会 导致一对双绞线上的信号对另外一对双绞线上的信号产生影响, 即串扰。 随着 DSL技术的发展, 速率越来越高, 频谱范围越来越宽。 在新一代的 DSL技术 VDSL2中, 线路速率最大双向 200Mbps, 频谱范围可达 40MHz。 如此宽的频 谱范围导致 VDSL2对线缆间串扰、 无线电频率干扰(RFI )等耦合过来的噪 声十分敏感, 在实际应用中会出现误码率高, 掉线率高等情况。
虚拟噪声(Virtual Noise )方案是其中一种提高线路稳定性的方法。在 DSL 的发送端预先配置一个发送端参考虚拟噪声 (TXREFVN ), 在 DSL训练的过 程中 TXREFVN将传递给接收端,接收端在训练过程中,可以得到各子载波的 衰减特性 Hlog(f), 并计算出在接收端的参考虚拟噪声。 接收端将训练过程中 得到的接收端实际噪声和接收端参考虚拟噪声取其中最大值,再决定各个子载 波上的分配的比特位和增益, 从而保证在 DSL线路激活后, 各子载波上拥有 比较高的噪声容限, 能够抵抗可能发生的噪声干扰, 提高线路的稳定性。
但是, 在实现本发明的过程中, 发明人经过研究发现在现有技术中, 虚拟 噪声是通过人工根据预期的可能的最大串音情况来设置的 ,设定值可能不符合 实际运行情况, 存在虚拟噪声过大或者过小的情况, 如果设置过大, 会导致开 销过大, 造成性能损失; 如果设置过低, 则会导致实际噪声发生时, 对线路不 起保护作用。
发明内容
本发明实施例中一方面提供一种 DSL参考虚拟噪声的确定方法及装置, 以提高参考虚拟噪声的准确性; 另一方面提供一种 DSL参考虚拟噪声的配置 方法及系统, 通过配置准确的参考虚拟噪声, 以提高 DSL的线路稳定性。
本发明实施例所提供的 DSL参考虚拟噪声的确定方法, 包括:
获取 DSL子载波的接收端实际噪声;
根据所述获取的子载波的接收端实际噪声, 确定参考虚拟噪声。
本发明实施例所提供的 DSL参考虚拟噪声的配置方法, 包括:
获取 DSL子载波的接收端实际噪声;
根据所述获取的子载波的接收端实际噪声,确定参考虚拟噪声, 利用所述 确定的参考虚拟噪声, 对 DSL的参考虚拟噪声参数进行配置。
本发明实施例所提供的 DSL参考虚拟噪声的确定装置, 包括: 实际噪声 获取模块和参考虚拟噪声确定模块 ,
所述实际噪声获取模块, 用于获取 DSL子载波的接收端实际噪声, 将与 所述子载波的接收端实际噪声相关的数据提供给所述参考虚拟噪声确定模块; 所述参考虚拟噪声确定模块, 用于根据来自所述实际噪声获取模块的数 据, 根据所述数据确定参考虚拟噪声。
本发明实施例所提供的 DSL参考虚拟噪声的配置系统, 包括:
参考虚拟噪声确定装置, 用于获取 DSL子载波上的接收端实际噪声, 根 据所述子载波上的接收端实际噪声, 确定参考虚拟噪声;
线路模板模块, 用于根据所述参考虚拟噪声确定装置提供的参考虚拟噪 声, 对 DSL的参考虚拟噪声参数进行配置。
本发明实施例所提供的一种记录有计算机可读程序的计算机可读存储介 质, 该程序使得计算单元执行如下方法:
获取 DSL子载波的接收端实际噪声;
根据所述获取的子载波的接收端实际噪声, 确定参考虚拟噪声。
从上述方案可以看出, 本发明实施例中, 通过在预设条件内, 获取 DSL 各子载波上的接收端实际噪声,并根据所述或取的各子载波上的接收端实际噪 声, 确定参考虚拟噪声; 然后利用所确定的参考虚拟噪声对 DSL的参考虚拟 噪声参数进行配置。 可见, 本发明实施例中可以根据 DSL线路上的各子载波 的接收端实际噪声调整参考虚拟噪声,从而提高了参考虚拟噪声的准确性。进 一步地,在对参考虚拟噪声参数进行配置时,可使参考虚拟噪声的配置更准确, 合理, 能够适应线路上的噪声变化, 提高了线路的稳定性。
进一步地, 由于该方案可以由设备和网管自动实现, 无需人工干预, 因此 降低了维护成本。
附图说明
图 1为本发明实施例中 DSL参考虚拟噪声配置方法的示例性流程图。 图 2为本发明实施例中 DSL参考虚拟噪声确定装置的示例性结构图。 图 3为本发明实施例中 DSL参考虚拟噪声配置系统的示例性结构图。 图 4为本发明具体实施例一中 DSL参考虚拟噪声配置方法的流程图。 图 5为本发明具体实施例一中 DSL参考虚拟噪声确定装置中实际噪声获 取模块的内部的结构图。
图 6为本发明具体实施例二中 DSL参考虚拟噪声配置方法的流程图。 图 7为本发明具体实施例二中 DSL参考虚拟噪声确定装置中实际噪声获 取模块的内部的结构图。
图 8为本发明具体实施例三中 DSL参考虚拟噪声配置方法的流程图。 图 9为本发明具体实施例三中 DSL参考虚拟噪声确定装置中实际噪声获 取模块的内部的结构图。
具体实施方式
本发明实施例中, 获取一组或多组 DSL各子载波上的接收端实际噪声; 根据所述获取的各子载波上的接收端实际噪声, 确定参考虚拟噪声。 例如: 从 所述获取的各子载波上的接收端实际噪声中选取对应子载波上的接收端实际 噪声最大值,根据所述选取的各子载波上的接收端实际噪声最大值,得到相应 子载波的接收端参考虚拟噪声; 和 /或, 从所述获取的各子载波上的接收端实 际噪声中选取对应子载波上的接收端实际噪声最大值,根据所述选取的各子载 波上的接收端实际噪声最大值和训练过程中得到的各子载波的衰减特性,得到 相应子载波的发送端参考虚拟噪声。进而利用所述得到的发送端参考虚拟噪声 对 DSL的发送端参考虚拟噪声参数进行配置, 或者利用所述得到的接收端参 考虚拟噪声对 DSL的接收端参考虚拟噪声参数进行配置。
参见图 1 , 图 1为本发明实施例中 DSL参考虚拟噪声配置方法的示例性 流程图。 如图 1所示, 该流程包括如下步骤:
步骤 101 , 获取一组或多组 DSL各子载波上的接收端实际噪声。
本步骤中, 获取一组或多组 DSL各子载波上的接收端实际噪声的方法有 很多种,根据本发明实施的上下文, 可以单次获得一组子载波上的接收端实际 噪声 ,也可以多次或者是在一定时间内监控获得多组子载波上的接收端实际噪 声。 例如, 至少可以有如下三种方法:
第一种方法: 预先使能在线重配置 (On-Line Reconfiguration, OLR )特 性, 并设置监控时间; 在监控时间内, 收集在线重配置调整后的各子载波的参 数,利用收集到的重配置调整后的各子载波的参数和训练过程中得到的各子载 波的参数计算, 通过计算得到 DSL各子载波上的接收端实际噪声。
DSL标准中定义了 OLR特性, 在线路条件或外部噪声环境发生緩慢变化 的时候, 允许 DSL在不掉线的前提下, 自动地调整当前的配置参数, 以保证 DSL仍然可以保持较好的性能和稳定性。 OLR特性主要包括: 比特交换(Bit Swapping, BS ); 动态速率 '爹正( Dynamic Rate Repartition, DRR ); 无缝速率 调整( Seamless Rate Adaptation, SRA )等。
其中, BS指的是根据当前各子载波上的信噪比, 重新分配各子载波上的 比特(Bi, 0<i≤子载波个数)和增益 (Gi, 0<i≤子载波个数), 即调整 Bi 和 Gi,但总速率 (∑Lp )保持不变,其中 Lp是每个物理媒质相关(子层)( Physical Media Dependent (sublayer), PMD )符号中第 p个延时通道承载的比特数; DRR 指的是根据当前各子载波上的信噪比, 重新分配各个时延通道的比特, 即调整 Lp, 但总速率(∑Lp )保持不变; SRA指的是根据当前各子载波上的信噪比, 重新分配各个时延通道的比特, 即调整 Lp, 同时调整各个子载波的比特和增 益, 换句话说, 调整 Bi和 Gi, 此时总速率(∑Lp )会发生变化。
OLR特性允许 DSL在激活的过程中, 根据线路状况发生的变化和预先设 定的目标噪声容限,在一定范围内调整各个子载波上的比特承载数目和发送功 率, 从而达到适应线路噪声变化, 保持线路稳定性的目的。 反过来, OLR 的 调整也反应了线路上的噪声变化情况。 因此,通过收集 OLR调整后的各参数, 以及训练过程中得到的各子载波的参数, 可以计算得出此时线路噪声的大小, 即各子载波的接收端实际噪声。 通过一段时间 (即预设的监控时间) 的统计, 可以得出线路上的各子载波的接收端实际噪声的最大噪声值。根据此最大噪声 值可以确定参考虚拟噪声, 利用确定的参考虚拟噪声对 DSL参考虚拟噪声参 数进行配置, 从而保证了激活后的 DSL线路噪声容限, 可以抵抗可能发生的 噪声干扰。
其中, 所收集的各子载波的参数包括: 各子载波的功率谱密度、 信噪比余 量和分配的比特位; 训练过程中得到的各子载波的参数包括: 各子载波的衰减 特性。 或者, 所收集的各子载波的参数包括: 各子载波的信噪比余量、 分配的 比特位和增益; 训练过程中得到的各子载波的参数包括: 各子载波的衰减特性 和参考功率谱密度。
第二种方法: 预先设置重训练监控时间, 或重训练次数; 在重训练监控时 间内, 或重训练次数内, 收集训练后的各子载波的参数; 利用收集到的各子载 波的参数计算, 通过计算得到 DSL各子载波上的接收端实际噪声。
因为在 DSL的训练过程中, 接收端会对信道特性进行测量, 得到信道上 各个子载波的衰减特性 Hlog(i)和接收端实际噪声 Actual—Received _Noise(f) , 从 而计算出各个子载波的信噪比 SNR(i), 并计算出各个子载波的分配的比特位 ( Bi, 0<i≤子载波个数)和增益 (Gi, 0<i≤子载波个数)。 反过来, 发送端与 接收端通过标准规定的调制方式及协议, 相互交换参数, 得到接收端的 Bi, Gi, Hlog(i)等, 可以计算出接收端实际噪声
Figure imgf000008_0001
。 经过"多 次重训练", 可以得出线路上的各子载波的接收端实际噪声的最大噪声值。 根 据此最大噪声值可以确定参考虚拟噪声, 利用确定的参考虚拟噪声对 DSL的 参考虚拟噪声参数进行配置, 从而保证了激活后的 DSL线路噪声容限, 可以 抵抗可能发生的噪声干扰。
其中, 所收集的训练后的各子载波的参数可以包括: 各子载波的功率谱密 度、 信噪比余量、 分配的比特位和衰减特性; 所收集的训练后的各子载波的参 数也可以包括: 各子载波的信噪比余量、 分配的比特位、 增益、 衰减特性和参 考功率谱密度。
第三种方法: 预先设置双端测试 DELT次数; 在 DELT次数内, 从 DELT 测试结果中, 得到 DSL各子载波上的接收端实际噪声。
因为在 DSL中定义了双端测试(DELT )特性, DELT特性是在 DSL训练 过程中, 进入线路诊断模式(Loop Diagnostic mode )来进行的, 并且 DELT 的输出结果中包括线路上的静态噪声 QLN(i)等参数, 该静态噪声即为 DSL相 应子载波上的接收端实际噪声。 经过执行多次 DELT, 可以得出线路上的各子 载波的接收端实际噪声的最大噪声值。根据此最大噪声值可以确定参考虚拟噪 声, 利用确定的参考虚拟噪声对 DSL的参考虚拟噪声参数进行配置, 从而保 证了激活后的 DSL线路噪声容限, 可以抵抗可能发生的噪声干扰。
因此, 该方法中进行单次或多次双端测试 DELT, 并从 DELT测试结果中 得到 DSL各子载波上的接收端实际噪声。
实际应用中,上述三种方法还可以组合使用,例如,组合其中的任意两种, 或组合上述三种。
根据所述获取的各子载波上的接收端实际噪声 ,确定参考虚拟噪声的过程 包括:
步骤 102, 根据所获取的各子载波上的接收端实际噪声确定对应子载波上 的接收端实际噪声最大值。
本实施例中,为了实现根据所获取的各子载波上的接收端实际噪声选取对 应子载波上的接收端实际噪声最大值, 可以预先设置接收端实际噪声记录表, 可选的,接收端实际噪声记录表允许存储多组获得的各子载波上的接收端实际 噪声, 这样, 可以直接将步骤 101 中每次获取 DSL各子载波上的接收端实际 噪声存储到接收端实际噪声记录表中,通过比较接收端实际噪声记录表中存储 的多组各子载波的接收端实际噪声, 得到各子载波上的接收端实际噪声最大 值。
可选的,在步骤 101中每次获取 DSL各子载波上的接收端实际噪声之后, 可以将所获取的各子载波上的接收端实际噪声值与所述接收端实际噪声记录 表中已存储的接收端实际噪声值进行比较,并使所述接收端实际噪声记录表中 保留二者之中的较大值, 这样, 最终保留在接收端实际噪声记录表中的各子载 波上的接收端实际噪声, 即为 DSL各子载波上的接收端实际噪声的最大值。
其中,本步骤 102中也可以从步骤 101所获取的多组各子载波上的接收端 实际噪声中选取对应子载波上的接收端实际噪声次大值,作为计算参考虚拟噪 声所依据的接收端实际噪声;本步骤 102中还可以将从步骤 101所获取的多组 各子载波上的接收端实际噪声在对应子载波上进行加权计算,得到相应子载波 的接收端实际噪声加权值, 作为计算参考虚拟噪声所依据的接收端实际噪声。
步骤 103 , 根据所选取的各子载波上的接收端实际噪声最大值和训练过程 中得到的各子载波的衰减特性, 或者调整系数, 或者两者的结合, 得到相应子 载波的发送端参考虚拟噪声; 和 /或, 根据所选取的各子载波上的接收端实际 噪声最大值, 和调整系数, 得到相应子载波的接收端参考虚拟噪声。
本步骤中, 可根据实际需要, 确定发送端参考虚拟噪声, 和 /或接收端参 考虚拟噪声。
假设 第 i 个 子 载 波 上 的 接 收 端 实 际 噪 声 最 大 值 为
Actual _ Re ceived _ Noise(i) , 第 i 个子载波上的发送端参考虚拟噪声为 TXREFVN{i) , 则 TXREFVNii) = Actual— Received _Noise(i) - H log(/) + a , 0<i≤子载 波个数 ; 假设接 收端 参考 虚 拟 噪 声 为 : RXREFVN(P) , 则 RXREFVNii) = Actual _ Received _Noise(i) + a , 0<i≤子载波个数。 其中, i/log( ), 0<i≤子载波个数, 为训练过程中得到的各子载波的衰 减特性, "为调整系数, 可根据经验值确定"的取值,
Figure imgf000010_0001
者 RZR£ ^W(/)进行调整, 其中, "可以是任意值, 单位为 dB , "的缺省值 为 0dB。
若步骤 102 中选取的是对应子载波上的接收端实际噪声次大值, 或者 是对所获取的各子载波上的接收端实际噪声在对应子载波上进行加权计算 得到相应子载波的接收端实际噪声 的加权值, 则本步骤中 的 Actual _ Re ceived _ Noise(i)分别对应接收端实际噪声次大值和所述加权值。
步骤 104, 利用所得到的参考虚拟噪声对参考虚拟噪声参数进行配置, 并 可进行重训练激活。
其中, 参考虚拟噪声通常由线路模板进行配置, 若步骤 103中确定的是发 送端的参考虚拟噪声, 则利用所得到的参考虚拟噪声对 DSL的发送端参考虚 拟噪声参数进行配置; 若步骤 103中确定的是接收端的参考虚拟噪声, 则利用 所得到的参考虚拟噪声对 DSL的接收端参考虚拟噪声参数进行配置。
此外, 步骤 103和步骤 104之间还可进一步包括: 对所得到的参考虚拟噪 声进行更新处理, 将更新处理后的参考虚拟噪声确定为当前的参考虚拟噪声, 即本次需配置的参考虚拟噪声。 具体实现时, 可以根据前次配置的参考虚拟噪 声和当前所得到的参考虚拟噪声来确定本次需配置的参考虚拟噪声, 例如, 可 以是利用前次配置的参考虚拟噪声和当前所得到的参考虚拟噪声进行线性组 合, 得到更新的参考虚拟噪声。 下面示出了其中的一种情况:
对 于 发 送 端 参 考 虚 拟 噪 声 , 有 : RXREFVN{i)newp = β * RXREFVN{i)oldp + (\ - βΥ RXREFVNi ) new; 对于接收端参考虚拟 噪声, 有: TXREFVNlp = β * TXREFVNii)oldp + (\ - βΥ TXREFVN(i)new
其中, RXREFVNij 和 TXREFVN(i ew为歩骤 103中所得到的参考虚拟噪声, RXREFVNij) oldp和 TXREFVN(i、 oldp为前次配置的参考虚拟噪声, RXREFVNQLP和 Γ皿/^ 为本次需配置的参考虚拟噪声, 为调整系数。 如果 为 0, 则 新的参考虚拟噪声不考虑以前的虚拟参考噪声。
上述实施例中, 发送端为用户端, 接收端为局端; 或者发送端为局端, 接 收端为用户端。 实际应用中, 若无需进行配置, 则步骤 104可以省略, 省略步 骤 104后的图 1即为本发明中 DSL发送端参考虚拟噪声的确定方法流程图。 实际应用中, 也可以只获取一组 DSL各子载波上的接收端实际噪声, 则 对应子载波的接收端实际噪声最大值即为该组获取的接收端实际噪声。
以上对本发明实施例中 DSL发送端参考虚拟噪声的配置方法及确定方法 进行了详细描述, 下面再对本发明实施例中 DSL参考虚拟噪声的确定装置进 行详细描述。
参见图 2, 图 2为本发明实施例中 DSL参考虚拟噪声确定装置的示例性 结构图。 如图 2中的实线部分所示, 该装置包括: 实际噪声获取模块和参考虚 拟噪声确定模块, 其中:
实际噪声获取模块, 用于获取多组 DSL各子载波上的接收端实际噪声, 将所述获取的各子载波上的接收端实际噪声相关的数据提供给参考虚拟噪声 确定模块。根据上下文, 所述实际噪声获取模块提供给参考虚拟噪声确定模块 的数据可以是所述获取的各子载波上的接收端实际噪声本身,也可以是对所述 获取的各子载波上的接收端实际噪声处理后的数据,该处理后的数据如在一定 时间内或预定次数内统计得到的接收端实际噪声的最大值。
实际应用中, 实际噪声获取模块也可以只获取一组 DSL各子载波上的接 收端实际噪声,将所述获取的各子载波上的接收端实际噪声提供给参考虚拟噪 声确定模块。
参考虚拟噪声确定模块,用于根据所述实际噪声获取模块获取的各子载波 上的接收端实际噪声, 确定参考虚拟噪声。
其中, 参考虚拟噪声确定模块在具体实现时, 可以有多种实现形式。 其中 一种可以为: 参考虚拟噪声确定模块包括:
第一参考虚拟噪声确定模块 ,用于从所述获取的各子载波上的接收端实际 噪声中选取对应子载波上的接收端实际噪声最大值,根据所述选取的各子载波 上的接收端实际噪声最大值和训练过程中得到的各子载波的衰减特性,确定相 应子载波的发送端参考虚拟噪声。 其中, 若所获取的 DSL各子载波上的接收 端实际噪声为一组,则此组接收端实际噪声可以直接作为接收端实际噪声最大 值。
第二参考虚拟噪声确定模块,用于从所获取的各子载波上的接收端实际噪 声中选取对应子载波上的接收端实际噪声最大值,根据所述选取的各子载波上 的接收端实际噪声最大值确定相应子载波的接收端参考虚拟噪声。其中, 若所 获取的 DSL各子载波上的接收端实际噪声为一组, 则此组接收端实际噪声可 以直接作为接收端实际噪声最大值。
具体实现时,上述两个模块也可以是从所获取的各子载波上的接收端实际 噪声中选取对应子载波上的接收端实际噪声次大值,或者是对所获取的各子载 波上的接收端实际噪声在对应子载波上进行加权计算,得到相应子载波的接收 端实际噪声加权值。 其中, 若所获取的 DSL各子载波上的接收端实际噪声为 一组, 则对应子载波的接收端实际噪声次大值即为该组获取的接收端实际噪 声。
进一步地, 参考虚拟噪声确定模块还可包括: 虚拟噪声更新模块, 用于将 所确定的参考虚拟噪声进行更新处理,将更新处理后的参考虚拟噪声作为重新 确定的应子载波的参考虚拟噪声。
更新处理的过程同样可以是利用前次配置的参考虚拟噪声和当前所得到 的参考虚拟噪声进行线性组合,得到更新的参考虚拟噪声, 下面示出了其中的 一种:
对 于 接 收 端 参 考 虚 拟 噪 声 , 有 : RXREFVN{i)newp = β * RXREFVN{i)oldp + (\ - βΥ RXREFVNi ) new; 对于发送端参考虚拟 噪声, 有: TXREFVNlp = β * TXREFVNii)oldp + (\ - βΥ TXREFVN(i)new
其中, RXREFVNij 和 TXREFVNd为第二参考虚拟噪声确定模块和第一 参考虚拟噪声确定模块根据实际噪声最大值所得到的参考虚拟噪声, RXREFVNij) oldp和 TXREFVN(i、oldp为前次配置的参考虚拟噪声, RXREFVNQLP和 Γ皿/^ 为本次需配置的参考虚拟噪声, 为调整系数。 如果 为 0 , 则 新的参考虚拟噪声不考虑以前的虚拟参考噪声。
此外, 如图 2中的虚线部分所示, 该装置可进一步包括: 参数配置模块, 用于获取参考虚拟噪声确定模块所确定的参考虚拟噪声, 利用该参考虚拟噪 声, 对 DSL的参考虚拟噪声参数进行配置。 其中, 所获取的参考虚拟噪声为 发送端参考虚拟噪声, 和 /或接收端参考虚拟噪声。
进一步地, 如图 2中的虚线部分所示, 该装置还可包括: 初始化模块, 用 于配置实际噪声获取条件, 所述配置实际噪声获取条件包括如下至少一种: 使 能在线重配置特性, 并设定监控时间; 进行重训练, 并设定重训练时间或重训 练次数; 及, 进行 DELT测试, 并设定测试次数。
实际噪声获取模块根据上述初始化模块配置的实际噪声获取条件,执行所 述获取一组或多组 DSL各子载波上的接收端实际噪声的操作。
下面,再对本发明实施例中 DSL参考虚拟噪声的配置系统进行详细描述。 参见图 3 , 图 3为本发明实施例中 DSL参考虚拟噪声配置系统的示例性 结构图。 如图 3所示, 该系统包括: 参考虚拟噪声确定装置和线路模板模块。
其中, 参考虚拟噪声确定装置, 用于获取多组 DSL各子载波上的接收端 实际噪声, 根据所获取的各子载波上的接收端实际噪声, 确定参考虚拟噪声, 将所确定的参考虚拟噪声提供给线路模板模块。 实际应用中, 参考虚拟噪声确 定装置, 也可以只获取一组 DSL各子载波上的接收端实际噪声, 根据所获取 的各子载波上的接收端实际噪声,确定参考虚拟噪声,将所确定的参考虚拟噪 声提供给线路模板模块。
其中, 参考虚拟噪声确定装置根据所获取的各子载波上的接收端实际噪 声, 确定参考虚拟噪声的具体实现形式可以有多种。 例如: 可以是从所获取的 各子载波上的接收端实际噪声中选取对应子载波上的接收端实际噪声最大值, 或次大值, 或对各子载波上的接收端实际噪声在对应子载波上进行加权计算, 得到相应子载波的接收端实际噪声的加权值,之后利用所选确定最大值、或次 大值、 或加权值确定参考虚拟噪声。 其中, 若所获取的 DSL各子载波上的接 收端实际噪声为一组,则此组接收端实际噪声可以直接作为接收端实际噪声以 确定参考虚拟噪声。
其中,图 3所示系统中的参考虚拟噪声确定装置可以与图 2所示装置的描 述一致, 只是该装置中不包含参数配置模块, 参数配置模块的功能由装置外部 的线路模板模块完成。
线路模板模块, 用于根据参考虚拟噪声确定装置提供的参考虚拟噪声,对 DSL的参考虚拟噪声参数进行配置。
可见, 本发明实施例中, 可以根据 DSL运行情况中收集相关参数, 并根 据收集的相关参数, 获取 DSL线路上的真实接收端噪声大小, 从而合理地确 定参考虚拟噪声大小,保证参考虚拟噪声的设置合理有效,从而提高线路稳定 性。
下面结合几个具体实施例及附图对 DSL 参考虚拟噪声的确定方法及装 置、 配置方法及系统进行详细描述。 为描述简便, 在具体实现时, 以下具体实 施例中均以从获取的多组各子载波上的接收端实际噪声中选取最大值的情形 为例,对于选取次大值以及进行加权计算的情况, 下述具体实施例中的方案同 样适用, 只需将相应的描述进行适应性修改即可。
具体实施例一:
本具体实施例中, 釆用图 1所示流程步骤 101中描述的方法一。
参见图 4, 图 4为本发明具体实施例一中 DSL参考虚拟噪声确定方法的 流程图。 如图 4所示, 该流程包括如下步骤:
步骤 401 , 使能 OLR特性, 激活 DSL。
本步骤中, 使能 OLR特性可包括 BS、 DRR和 SRA等, 并且同时选择 SNRM— MODE=l或者 SNRM— MODE=2。 当选择 SNRM— MODE=l , 无需配置 发送端参考虚拟噪声 TXREFVN的初始值; 当选择 SNRM— MODE=2时, 需要 配置 TXREFVN的初始值,一般情况下可配置一个较小值,如 -140dBm/Hz等。
步骤 402, 对 DSL运行进行监控。
本实施例中, 可预先设置监控时间。
步骤 403 , 在线路条件发生变化时, 触发 OLR功能对线路参数进行调整, 收集调整后的相关参数。
其中, 调整后的相关参数可包括: 各子载波的功率谱密度( ¾©(0 , 0<i< 子载波个数)、 信噪比余量(SVRM(0 , 0<i≤子载波个数)、 分配的比特位(Bi, 0<i≤子载波个数)以及增益(Gi, 0<i≤子载波个数)等。 本步骤中, 发送端可 直接获取上述调制后的相关参数。
步骤 404, 计算各子载波上此时的接收端实际噪声大小。
本步骤中, 发送端在进行计算时, 可有如下两种情况:
1 ) 当 SNRM— MODE = 1 时, 此时 DSL的激活是不考虑虚拟噪声的, 则 步骤 403 中调整后的参数中的 SVR (0 , 0<i≤子载波个数, 为实际的信噪比余 量, 可以通过以下公式计算接收端实际噪声大小: Actual _ Re ceived _ Noise{i) = PSD ( ) + H log(z') - SNRM ( ) -Βίχ3-Γ 或者通过以下公式计算:
Actual _ Re ceived _ Noise{i) = MREFPSD{i) + Gi + H log(/) - SNRM(i)— 5/ x 3— Γ 其中, Γ是信噪比偏差 (SNR GAP), 为常数 9.75dB; H\og(i), 0<i≤子 载波个数, 为训练过程中得到的各子载波的衰减特性; MREFPSDii) , 0<i≤子 载波个数, 为训练过程中得到的各子载波的参考功率谱密度。
相应地, ¾©(0为第 i个子载波的功率谱密度, 单位为 dBm/Hz; Η\ο ) 为训练过程中得到的第 i个子载波的衰减特性, 单位为 dB; SVRM()为第 i个 子载波的信噪比余量, 单位为 dB; Bi为第 i个子载波分配的比特位, Bix3的 单位为 dB; Gi为第 i个子载波的增益, 单位为 dB; MR£F¾©()为训练过程中 得到的第 i个子载波的参考功率谱密度, 单位为 dBm/Hz。
2) 当 SNRM— MODE = 2时, 此时 DSL的激活是考虑虚拟噪声的, 则步 骤 403 中调整后的参数中的 SNRM(0, 0<i≤子载波个数, 为考虑虚拟噪声后的 信噪比余量。
若欲确定发送端参考虚拟噪声,可以通过以下公式计算接收端实际噪声大 小:
Actual _ Re ceived _Noise(i) =
max{PSD(i) - SNRM(i) - TXREFVN(i) -Βίχ3-Γ,
PSD(i) + H log() - SNRM(i) -Βίχ3-Γ} 若欲确定发送端参考虚拟噪声,也可以通过以下公式计算接收端实际噪声 大小:
Actual Re ceived _ Noise()
max{MREFPSD(i) + Gi - SNRM(i) - TXREFVN{i) - / x 3 - Γ,
MREFPSD{i) + Gi + H log() - SNRM(i) -Bix3-T] 若欲确定接收端参考虚拟噪声,可以通过以下公式计算接收端实际噪声大 小:
Actual—Received—Noise(f) =
ax{PSD(i) + H log() - SNRM(i) - RXREFVN(i) -Βίχ3-Γ,
PSD(i) + H log(/) - SNRM(i) -Βίχ3-Γ} 若欲确定接收端参考虚拟噪声,也可以通过以下公式计算接收端实际噪声 大小:
Actual _ Re ceived _ Noise( ) =
max{MREFPSD(i) + Gi + H log(z) - SNRM ) - RXREFVN ) - Bix 3 - T,
MREFPSDij) + Gi + H log(z) - SNRMQ) - Bi x3 - T} 若欲确定发送端参考虚拟噪声和接收端参考虚拟噪声,可以根据上述对应 的公式进行计算, 并保留各自对应的取值。
上述各式中, max{}为取最大值的函数; Γ是 SNR GAP, 为常数 9.75dB; H \og(i) , 0<i≤子载波个数, 为训练过程中得到的各子载波的衰减特性; MREFPSD(i) , 0<i≤子载波个数, 为训练过程中得到的各子载波的参考功率谱 密度; TXMFVN ( ) , 0<i≤子载波个数, 为各子载波的发送端参考虚拟噪声; RXREFVN{i) , 0<i≤子载波个数, 为各子载波的接收端参考虚拟噪声。
相应地, ¾©(0为第 i个子载波的功率谱密度, 单位为 dBm/Hz; H \og(i) 为训练过程中得到的第 i个子载波的衰减特性, 单位为 dB; SVRM(0为第 i个 子载波的信噪比余量, 单位为 dB; Bi为第 i个子载波的分配的比特位, Bix3 的单位为 dB; Gi为第 i个子载波的增益, 单位为 dB; TXREFVN (i)为第 i个子 载波的发送端参考虚拟噪声, 单位为 dBm/Hz; 为第 i个子载波的 接收端参考虚拟噪声, 单位为 dBm/Hz; MR£" ¾/)(0为训练过程中得到的第 i 个子载波的参考功率语密度, 单位为 dBm/Hz。
步骤 405 , 将步骤 404中计算得到的当前实际噪声与之前得到的实际噪声 进行比较, 根据比较结果, 将较大的噪声值进行保存。
本实施例中, 若预先在系统中设置有一份接收端实际噪声记录表, 则每次 发生 OLR后, 将步骤 404中得到的当前实际噪声与实际噪声记录表中的值进 行比较, 并在表中保存较大的噪声值。 如是第一次得到的实际噪声, 则直接将 各子载波的实际噪声结果保存在表中。
当 SNRM— MODE = 2时, 若欲确定发送端参考虚拟噪声和接收端参考虚 拟噪声, 则接收端实际噪声记录表为两份,且将步骤 404中各自保留的值分别 与对应的实际噪声记录表进行比较。
步骤 406 , 判断监控是否结束, 如果结束, 则执行步骤 407; 否则, 可返 回执行步骤 402。
本实施例中, 若设置了监控时间, 则达到监控时间时, 监控结束。
步骤 407 , 读取接收端实际噪声的最大值, 根据所读取的接收端实际噪声 的最大值, 计算得到参考虚拟噪声。
本实施例中, 若预先在系统中设置有一份接收端实际噪声记录表,且步骤
405中, 每次在接收端实际噪声记录表中存储较大的接收端实际噪声值, 则本 步骤中, 可直接从接收端实际噪声记录表读取所存储的接收端实际噪声值, 即 为接收端实际噪声的最大值。
本步骤中, 若第 i 个子载波上的接收端实际噪声最大值记为 Actual _ Re ceived _ Noise(i) , 则第 i 个子载波上的发送端参考虚拟噪声为 TXREFVN{i) = Actual _ Re ceived _ Noise(i) - H log(/) + a , 0<i≤子载波个数; 第 i个子 载波上的接收端参考虚拟噪声为 RXREFVN(i、 = Actual—Re ceived _ Noise(i、 + a。
其中, i/log( ), 0<i≤子载波个数, 为训练过程中得到的各子载波的衰减 特性, "为调整系数, 可根据经验值确定"的取值, 以对 TXREFVN( ^ 进行调整,其中, (X可以是任意值,单位为 dB , a的缺省值为 0dB。 相应地, TXREFVNf^为第 i 个子载波上的发送端参考虚拟噪声, 为第 i 个子载波上的接收端参考虚拟噪声, 单位为 dBm/Hz ; Actual _ Re ceived _ Noise )为第 i个子载波上的接收端实际噪声最大值, 单位为 dBm/Hz; i log( )为训练过程中得到的第 i个子载波的衰减特性, 单位为 dB。
步骤 408 , 根据计算的参考虚拟噪声, 对 DSL的参考虚拟噪声参数进行 配置。
在步骤 408中, 可以根据步骤 407中得到的 TXREFVN( , 0<i≤子载波个 数, 对 DSL的发送端参考虚拟噪声参数进行配置, 并且在配置发送端参考虚 拟噪声参数时, 需要配置 SNRM— MDOE=2 , 之后可进行重新训练激活, 并返 回执行步骤 402。
在步骤 408中, 可以根据步骤 407中得到的™^ N( ) , 0<i≤子载波个 数, 对 DSL的接收端参考虚拟噪声参数进行配置, 之后可进行重新训练激活, 并返回执行步骤 402。
在步骤 408 中, 还可以根据步骤 407 中得到的: T ^Ff ( )和 RXREFVN ) ? 0<i≤子载波个数, 对发送端参考虚拟噪声和接收端参考虚拟噪 声分别进行配置, 配置过程参考上述内容。
上述流程中, 步骤 405还可以为: 将步骤 404中得到的当前实际噪声进行 存储。 若预先在系统中设置有一份接收端实际噪声记录表, 则每次发生 OLR 后, 将步骤 404 中得到的当前实际噪声存储在实际噪声记录表中。 步骤 407 中获取接收端实际噪声的最大值时,可从实际噪声记录表中选取接收端实际噪 声的最大值。
上述流程中, 若无需进行配置, 则步骤 408可以省略, 省略步骤 408后的 图 4即为本发明中 DSL发送端参考虚拟噪声的确定方法流程图。
以上对本发明具体实施例一中 DSL参考虚拟噪声的配置方法及确定方法 进行了详细描述, 下面再对本发明具体实施例一中 DSL参考虚拟噪声的确定 装置进行详细描述。
本具体实施例中装置的组成、连接关系及功能与图 2所示装置中的描述一 致。 不同之处在于, 具体实现时如图 5所示, 图 5为本发明具体实施例一中 DSL 参考虚拟噪声确定装置中实际噪声获取模块的内部结构图。 实际噪声获 取模块可具体包括: 调整参数获取模块、 实际噪声计算模块和存储模块。
其中, 调整参数获取模块, 用于使能在线重配置特性 OLR时, 在预设的 条件内, 获取因线路变化而触发 OLR功能进行线路参数调整后的各子载波的 参数, 将所述获取的参数提供给实际噪声计算模块。
实际噪声计算模块,用于根据所述调整参数获取模块提供的各子载波的参 数, 以及训练过程中得到的各子载波的参数, 计算得到 DSL各子载波上的接 收端实际噪声 , 将所计算的接收端实际噪声提供给存储模块进行存储。
存储模块,用于存储实际噪声获取模块提供的各子载波上的接收端实际噪 声。其中,存储模块中存储的接收端实际噪声可以是每次实际噪声计算模块提 供的接收端实际噪声,也可以是实际噪声计算模块提供的当前接收端实际噪声 和之前存储的接收端实际噪声比较之后的接收端实际噪声较大值。
参考虚拟噪声确定模块,用于从存储模块中获取各子载波上的接收端实际 噪声最大值, 根据所述获取的接收端实际噪声最大值, 确定参考虚拟噪声。
具体实施例二: 本实施例中, 釆用图 1所示流程步骤 101中描述的方法二。
参见图 6, 图 6为本发明具体实施例二中 DSL参考虚拟噪声配置方法的 流程图。 如图 6所示, 该流程包括如下步骤:
步骤 601, 对 DSL运行进行监控。
本实施例中, "多次重训练 "时, 可以设定训练次数, 在训练次数内对 DSL 运动进行监控, 并对 DSL进行重训练; 或者设定监控时间, 在监控时间内, 对 DSL运行进行监控, 包括监控 DSL的激活, 收集相关参数等。
步骤 602 , 对 DSL线路进行"重训练", 并收集训练后的相关参数。
其中, 训练后的相关参数可包括: 各子载波的功率谱密度( ¾©(0, 0<i< 子载波个数)、 信噪比余量(SVRM(0, 0<i≤子载波个数)、 分配的比特位(Bi,
0<i≤子载波个数)、增益(Gi, 0<i≤子载波个数)以及衰减特性( i log(), 0<i< 子载波个数)等。 本步骤中, 发送端从接收端获取训练后的相关参数。
步骤 603, 计算各子载波上此时的实际接收端噪声大小。
本步骤中, 发送端在进行计算时, 可有如下两种情况:
1 ) 当 SNRM— MODE= l 时, 此时 DSL的激活是不考虑虚拟噪声的, 则 步骤 602中相关参数中的 SVRM(0, 0<i≤子载波个数, 为实际的信噪比余量, 可以通过以下公式计算接收端实际噪声大小:
Actual _ Re ceived _ Noise{i) = PSD{i) + H log( ) - SNRM ( ) -Bix3-T
也可以通过以下公式计算接收端实际噪声大小:
Actual _ Re ceived _ Noise(i) = MREFPSD{i) + Gi + H log(/) - SNRM(i) - 5/ x 3 - Γ
Γ是 SNRGAP, 为常数 9.75dB; H\ g(i), 0<i≤子载波个数, 为训练过程 中得到的各子载波的衰减特性; MREFPSDii , 0<i≤子载波个数, 为训练过程 中得到的各子载波的参考功率谱密度。
相应地, ¾©(0为第 i个子载波的功率谱密度, 单位为 dBm/Hz; H\og(i) 为训练过程中得到的第 i个子载波的衰减特性, 单位为 dB; SVRM(0为第 i个 子载波的信噪比余量, 单位为 dB; Bi为第 i个子载波的分配的比特位, Bix3 的单位为 dB; Gi为第 i个子载波的增益, 单位为 dB; MR£F¾©()为训练过程 中得到的第 i个子载波的参考功率谱密度, 单位为 dBm/Hz。
2) 当 SNRM— MODE = 2时, 此时 DSL的激活是考虑虚拟噪声的, 步骤 602 中相关参数中的 SVR (0, 0<i≤子载波个数, 为考虑虚拟噪声后的信噪比 余量。
若欲确定发送端参考虚拟噪声,可以通过以下公式计算接收端实际噪声大 小:
Actual _ Re ceived— Noise{i) =
ma {PSD(i) - SNRM(i) - TXREFVNii) -Βίχ3-Γ,
PSD(i) + H log() - SNRM(i) -Βίχ3-Γ} 若欲确定发送端参考虚拟噪声,还可以通过以下公式计算接收端实际噪声 大小:
Actual _ Re ceived _ Noise() =
? & {MREFPSDii) + Gi - SNRM(i) - TXREFVNii) -Bix3-T,
MREFPSDii) + Gi + H log(z) - SNRM ) -Bix3-T} 若欲确定接收端参考虚拟噪声,可以通过以下公式计算接收端实际噪声大 小:
Actual Re ceived _ Noise(i) =
ma {PSD(i) + H log() - SNRM(i) - RXREFVN(i) -Βίχ3-Γ,
PSD(i) + H log() - SNRM(i) -Βίχ3-Γ} 若欲确定接收端参考虚拟噪声,还可以通过以下公式计算接收端实际噪声 大小:
Actual _ Re ceived _ Noise() =
? & {MREFPSDii) + Gi + H log(z) - SNRMQ) - RXREFVN ) -Bix3-T,
MREFPSDii) + Gi + H log(z) - SNRMQ) -Bix3-T} 若欲确定发送端参考虚拟噪声和接收端参考虚拟噪声,可以根据上述对应 的公式分别进行计算, 并保留各自对应的取值。
上述各式中, max{}为取最大值的函数; Γ是 SNRGAP, 为常数 9.75dB;
H\og(i) , 0<i≤子载波个数, 为训练过程中得到的各子载波的衰减特性;
MREFPSDii) , 0<i≤子载波个数, 为训练过程中得到的各子载波的参考功率谱 密度; TXMFVN( ), 0<i≤子载波个数, 为各子载波的发送端参考虚拟噪声;
RXREFVNii) , 0<i≤子载波个数, 为各子载波的接收端参考虚拟噪声。 相应地, PSD(i)为第 i个子载波的功率谱密度, 单位为 dBm/Hz; H \og(i) 为训练过程中得到的第 i个子载波的衰减特性, 单位为 dB; SVRM(0为第 i个 子载波的信噪比余量, 单位为 dB; Bi为第 i个子载波的分配的比特位, Bix3 的单位为 dB; Gi为第 i个子载波的增益, 单位为 dB; TXREFVN (i)为第 i个子 载波的发送端参考虚拟噪声, 单位为 dBm/Hz; 为第 i个子载波的 接收端参考虚拟噪声, 单位为 dBm/Hz; MR£" ¾/)(0为训练过程中得到的第 i 个子载波的参考功率语密度, 单位为 dBm/Hz。
步骤 604 , 将步骤 603中得到的当前实际噪声与之前得到的实际噪声进行 比较, 根据比较结果, 将较大的噪声值进行保存。
本实施例中, 若预先在系统中保存一份接收端的实际噪声记录表,每次训 练后,将步骤 603中得到的当前实际噪声与噪声记录表中的值进行比较, 并在 表中保存较大的噪声值。如是第一次得到的实际噪声, 直接将各子载波的实际 噪声结果保存在表中。
当 SNRM— MODE = 2时, 若欲确定发送端参考虚拟噪声和接收端参考虚 拟噪声, 则接收端实际噪声记录表为两份,且将步骤 404中保留的各自对应的 值分别与对应的实际噪声记录表进行比较。
步骤 605 , 判断监控是否结束, 如果结束, 则执行步骤 606; 否则, 可返 回执行步骤 601。
本实施例中, 若设置了监控时间, 则达到监控时间时, 监控结束; 若设置 了重训练次数, 则达到重训练次数时, 监控结束。
步骤 606 , 读取接收端实际噪声的最大值, 根据所读取的接收端实际噪声 的最大值, 计算得到参考虚拟噪声。
本实施例中, 若预先在系统中设置有一份接收端实际噪声记录表,且步骤 604中, 每次在接收端实际噪声记录表中存储较大的接收端实际噪声值, 则本 步骤中, 可直接从接收端实际噪声记录表读取所存储的接收端实际噪声值, 即 为接收端实际噪声的最大值。
本步骤中, 若第 i 个子载波上的接收端实际噪声最大值记为 Actual _ Re ceived _ Noise(i) , 则第 i 个子载波上的发送端参考虚拟噪声为 TXREFVN{i) = Actual _ Re ceived _ Noise(i) - H log(/) + a , 0<i≤子载波个数; 第 i个子 载波上的接收端参考虚拟噪声为 RXREFVN(i、 = Actual—Re ceived _ Noise(i、 + a。 其中, i/log( ), 0<i≤子载波个数, 为训练过程中得到的各子载波的衰减 特性, "为调整系数, 可根据经验值确定"的取值, 以对 TXREFVN( ^ 进行调整, 其中, "可以是任意值, 单位是 dB , "的缺省值为 0dB。
相应地, TXREFVNf^为第 i 个子载波上的发送端参考虚拟噪声, 为第 i 个子载波上的接收端参考虚拟噪声, 单位为 dBm/Hz ; Actual _ Re ceived _ Noise )为第 i个子载波上的接收端实际噪声最大值, 单位为 dBm/Hz; i log( )为训练过程中得到的第 i个子载波的衰减特性, 单位为 dB。
步骤 607 , 根据计算的参考虚拟噪声, 对 DSL的参考虚拟噪声参数进行 配置。
本步骤中,根据步骤 606中得到的 TXREFVN( , 0<i≤子载波个数,对 DSL 的发送端参考虚拟噪声参数进行配置, 并且在配置发送端参考虚拟噪声参数 时, 需要配置 SNRM— MODE=2 , 之后可进行重新训练激活, 并返回执行步骤 601。
可选地, 根据步骤 606中得到的™^ N( ) , 0<i≤子载波个数, 对 DSL 的接收端参考虚拟噪声参数进行配置,之后可进行重新训练激活, 并返回执行 步骤 601。
可选地, 根据步骤 606 中得到的: T ^ N( ), 和 RXREFVN , 0<i≤子 载波个数, 对 DSL的发送端参考虚拟噪声参数和接收端参考虚拟噪声参数进 行配置, 配置过程参考上述内容。
上述流程中, 步骤 604还可以为: 将步骤 603中得到的当前实际噪声进行 存储。 若预先在系统中设置有一份接收端实际噪声记录表, 则每次发生 OLR 后, 将步骤 603中得到的当前实际噪声存储在实际噪声记录表中。 则步骤 606 中需要获取接收端实际噪声的最大值时,可从实际噪声记录表中选取接收端实 际噪声的最大值。
上述实施例中, 若无需进行配置, 则步骤 607 可以省略, 省略步骤 607 后的图 6即为本发明中 DSL发送端参考虚拟噪声的确定方法流程图。
以上对本发明具体实施例二中 DSL参考虚拟噪声的配置方法及确定方法 进行了详细描述, 下面再对本发明具体实施例二中 DSL参考虚拟噪声的确定 装置进行详细描述。
本具体实施例中装置的组成、连接关系及功能与图 2所示装置中的描述一 致。 不同之处在于, 具体实现时如图 7所示, 图 7为本发明具体实施例二中 DSL 参考虚拟噪声确定装置中实际噪声获取模块的内部的结构图。 实际噪声 获取模块可具体包括: 训练参数获取模块、 实际噪声计算模块和存储模块。
其中, 训练参数获取模块, 用于重训练过程中, 在预设的条件内获取训练 后的各子载波的参数, 将所述获取的参数提供给实际噪声计算模块。
实际噪声计算模块,用于根据所述训练参数获取模块提供的各子载波的参 数, 计算得到 DSL各子载波上的接收端实际噪声, 将所计算的接收端实际噪 声提供给存储模块进行存储。
存储模块,用于存储实际噪声获取模块提供的各子载波上的接收端实际噪 声。其中,存储模块中存储的接收端实际噪声可以是每次实际噪声计算模块提 供的接收端实际噪声,也可以是实际噪声计算模块提供的当前接收端实际噪声 和之前存储的接收端实际噪声比较之后的接收端实际噪声较大值。
参考虚拟噪声确定模块,用于根据存储模块中存储的记录获取各子载波上 的接收端实际噪声最大值,根据所述获取的接收端实际噪声最大值,确定参考 虚拟模块。
具体实施例三:
本实施例中, 釆用图 1所示流程步骤 101中描述的方法三。
参见图 8, 图 8为本发明具体实施例三中 DSL参考虚拟噪声配置方法的 流程图。 如图 8所示, 该流程包括如下步骤:
步骤 801 , 进行 DELT测试。
本实施例中, 可预先设定进行 DELT测试的次数。
步骤 802, 从 DELT的测试结果中, 直接获取当前各子载波上的接收端实 际噪声。
因为 DELT 的测试结果中, 直接输出接收端的各个子载波上的实际噪声 ( QLN(i), 0<i≤子载波个数), 其中, QLN(i), 0<i≤子载波个数, 即为当前各 子载波上的接收端实际噪声,接收端将 DELT测试结果中输出的当前各子载波 上的接收端实际噪声发送给发送端。
步骤 803 , 将步骤 802中得到的当前实际噪声与之前得到的实际噪声进行 比较, 根据比较结果, 将较大的噪声值进行保存。
本实施例中, 若预先在发送端系统中设置有一份接收端实际噪声记录表, 则每次 DELT测试后,发送端将步骤 802中得到的当前实际噪声与实际噪声记 录表中的值进行比较, 并在表中保存较大的噪声值。如是第一次得到的实际噪 声, 则直接将各子载波的实际噪声结果保存在表中。
步骤 804, 判断是否达到预设的 DELT次数, 如果是, 则执行步骤 805; 否则, 可返回执行步骤 801。
步骤 805 , 读取接收端实际噪声的最大值, 根据所读取的接收端实际噪声 的最大值, 计算得到参考虚拟噪声。
本实施例中, 若预先在系统中设置有一份接收端实际噪声记录表,且步骤 803中, 每次在接收端实际噪声记录表中存储较大的接收端实际噪声值, 则本 步骤中, 可直接从接收端实际噪声记录表读取所存储的接收端实际噪声值, 即 为接收端实际噪声的最大值。
本步骤中, 若第 i 个子载波上的接收端实际噪声最大值记为 Actual _ Re ceived _ Noise(i) , 则第 i 个子载波上的发送端参考虚拟噪声为 TXREFVN{i) = Actual _ Re ceived _ Noise(i) - H log(/) + a , 0<i≤子载波个数; 第 i个子 载波上的接收端参考虚拟噪声为 RXREFVN(i、 = Actual—Re ceived _ Noise(i、 + a。
其中, i log( ), 0<i≤子载波个数, 为训练过程中得到的各子载波的衰减 特性, "为调整系数, 可根据经验值确定"的取值, 以对 TXREFVN( ^ 进行调整, 其中, "可以是任意值, 单位为 dB , "的缺省值为
0dB。
相应地, TXREFVNf^为第 i 个子载波上的发送端参考虚拟噪声, RXMFVN if)为第 i 个子载波上的接收端参考虚拟噪声, 单位为 dBm/Hz; Actual _ Re ceived _ Noise(i)为第 i个子载波上的接收端实际噪声最大值, 单位为 dBm/Hz; i log( )为训练过程中得到的第 i个子载波的衰减特性, 单位为 dB。
步骤 806, 根据计算的参考虚拟噪声, 对 DSL的参考虚拟噪声进行配置。 在步骤 806中, 可以根据步骤 805中得到的: r ^ N(0 , 0<i≤子载波个 数, 对 DSL的发送端参考虚拟噪声参数进行配置, 并且在配置发送端参考虚 拟噪声参数时, 需要配置 SNRM— MDOE=2 , 之后可进行重新训练激活, 并重 新设定进行 DELT测试的次数, 返回执行步骤 801。
在步骤 806中, 也可以根据步骤 805中得到的 RXREFVN ) , 0<i≤子载波 个数, 对 DSL的接收端参考虚拟噪声参数进行配置, 之后可进行重新训练激 活, 并返回执行步骤 801。
在步骤 806中,还可以根据步骤 805中得到的 TXREFVN( )和 RXREFVN( ) 对发送端参考虚拟噪声和接收端参考虚拟噪声分别进行配置,配置过程参考上 述内容。
上述流程中, 步骤 803还可以为: 将步骤 802中得到的当前实际噪声进行 存储。 若预先在系统中设置有一份接收端实际噪声记录表, 则每次发生 OLR 后, 将步骤 802中得到的当前实际噪声存储在实际噪声记录表中。 则步骤 805 中获取接收端实际噪声的最大值时,可从实际噪声记录表中选取接收端实际噪 声的最大值。
上述实施例中, 若无需进行配置, 则步骤 806 可以省略, 省略步骤 806 后的图 8即为本发明中 DSL发送端参考虚拟噪声的确定方法流程图。
以上对本发明具体实施例三中 DSL参考虚拟噪声的配置方法及确定方法 进行了详细描述, 下面再对本发明具体实施例三中 DSL参考虚拟噪声的确定 装置进行详细描述。
本具体实施例中装置的组成、连接关系及功能与图 2所示装置中的描述一 致。 不同之处在于, 具体实现时如图 9所示, 图 9为本发明具体实施例三中 DSL 参考虚拟噪声确定装置中实际噪声获取模块的内部的结构图。 实际噪声 获取模块可具体包括: DELT结果获取模块、 实际噪声确定模块和存储模块。
其中, DELT 结果获取模块, 用于获取 DELT 的测试结果, 将所获取的 DELT测试结果提供给实际噪声确定模块。
实际噪声确定模块,用于从 DELT结果获取模块提供的 DELT测试结果中, 获取 DSL各子载波上的接收端实际噪声, 将所获取的接收端实际噪声提供给 存储模块进行存储。
存储模块,用于存储实际噪声确定模块提供的各子载波上的接收端实际噪 声。其中,存储模块中存储的接收端实际噪声可以是每次实际噪声计算模块提 供的接收端实际噪声 也可以是实际噪声计算模块提供的当前接收端实际噪声 和之前存储的接收端实际噪声比较之后的接收端实际噪声较大值。
参考虚拟噪声确定模块,用于根据存储模块存储的记录获取各子载波上的 接收端实际噪声最大值,根据所述获取的接收端实际噪声最大值,确定参考虚 拟噪声。
上述三个具体实施例中的配置系统可以与图 3所示系统中的描述一致。 其中, 上述三个具体实施例中的方法可与图 1中的描述一致, 进一步地, 可利用所得到的参考虚拟噪声进行更新处理,将更新处理后的参考虚拟噪声确 定为当前参考虚拟噪声, 即本次需配置的参考虚拟噪声。 具体实现时, 可以是 将前次配置的参考虚拟噪声和本次所得到的参考虚拟噪声进行线性组合,得到 更新的参考虚拟噪声, 如下所示:
对 于 发 送 端 参 考 虚 拟 噪 声 , 有 :
RXREFVN{i)newp = β * RXREFVN{i)oldp +(\-βΥ RXREFVNi) new; 对于接收端参考虚拟 噪声, 有: TXREFVi p = β * TXREFVi + (} _ TXREFVi
其中, RXREFVNiP) 和 TXREFVNii 为根据实际噪声最大值所得到的参考 虚拟噪声, RXREFVN、oldp和 TXREFVN{T) oldp为前次配置的参考虚拟噪声,
™^ (0 和^ ^ (0 为本次需配置的参考虚拟噪声, 为调整系数。 如果 为 0, 则新的参考虚拟噪声不考虑以前的虚拟参考噪声。
其中, 可以将上述本次所得到发送端的参考虚拟噪声的公式
TXREFVN(i) = Actual _ Re ceived _ Noise(i) - H log(/') + a代入更新处理所使用的公式
TXREFVN(i)newp = β * TXREFVN(i)oldp +(\-βΥ TXREFVN(i)new ,可得第 i个子载波上更 新的发送端参考虚拟噪声:
TXREFVN(i)newp = β * TXREFVN{i)oldp +(1~β)* TXREFVN(i)new
= β * TXREFfi * TXREFVN{i)oldp +(1-β)* (Actual _ Re ceived _ Noise(i) - H log(/) + a)
= β * TXREFfi * TXREFVN{i)oldp +(\-β)* Actual _ Re ceived _ Noise(i) -(\-β)*(Η log(/) + a) 令 =- (1- )*(Hlog() + ") , 则上式可得:
TXREFVN(i)newp = β * TXREFfi * TXREFVNij) oldp +{\-βΥ Actual _ Re ceived _ Noise(i) + b, 其中, i/log(), 0<i≤子载波个数, 为训练过程中得到的各子载波的衰减 特性, "为调整系数, 可根据经验值确定"的取值,
Figure imgf000027_0001
整, 其中, "可以是任意值, 单位为 dB , " 的缺省值为 OdB 。
Actual _ Re ceived _ Noise(i)为第 i个子载波上的接收端实际噪声的统计结果, 例 如接收端实际噪声的最大值, 单位为 dBm/Hz; i log( )为训练过程中得到的 第 i个子载波的衰减特性, 单位为 dB ; 是一个调整参数或称偏移参数, 单位 为 dB , 其含义是在当前的基础上增加的一个相当于裕量的参数, 表示在当前 统计的噪声基础上增加 dB 的裕量。 根据上述公式, 可以利用接收端实际噪 声的统计结果和当前配置的参考虚拟噪声进行线性组合,得到更新的参考虚拟 噪声, 将所述更新的参考虚拟噪声确定为当前需要配置的参考虚拟噪声。
同样的, 第 i 个子载波上更新的接收端参考虚拟噪声为:
RXREFVN(i)mw = β * RXREFVN(i)oldp + (1 - ) * RXREFVN(i)mw
= β * RXREFfi * TXREFVN(i)oldp + (1 _ ) * (Actual Re ceived _Noise(i) + a)
= β * RXREFfi * TXREFVN(i)oldp + (1 _ ) * Actual Re ceived _Noise(i) - (\ - β) " 令 = - (1 - 则上式可得:
RXREFVN(i)new = β * RXREFfi * TXREFVN ) oldp + {\ - βΥ Actual Re ceived _ Noise(i) + b2 其中, 是一个调整参数或称偏移参数, 单位为 dB , 其含义是在当前的基 础上增加的一个相当于裕量的参数, 表示在当前统计的噪声基础上增加 62 dB 的裕量。
根据上述公式,可以利用接收端实际噪声的统计结果和当前配置的参考虚 拟噪声进行线性组合,得到更新的参考虚拟噪声, 将所述更新的参考虚拟噪声 确定为当前需要配置的参考虚拟噪声。
上述三个具体实施例中的装置可与图 2中的描述一致, 进一步地, 参考虚 拟噪声确定模块还可包括: 虚拟噪声更新模块, 用于利用所确定的参考虚拟噪 声进行更新处理,将更新处理后的参考虚拟噪声确定为当前对应子载波的参考 虚拟噪声。
更新处理的过程同样可以是利用前次配置的参考虚拟噪声和本次所得到 的参考虚拟噪声进行线性组合, 得到更新的参考虚拟噪声, 如下所示:
对 于 接 收 端 参 考 虚 拟 噪 声 , 有 : RXREFVN{i)newp = β * RXREFVN{i)oldp + (\ - βΥ RXREFVNi ) new; 对于发送端参考虚拟 噪声, 有: TXREFVNlp = β * TXREFVNii)oldp + (\ - βΥ TXREFVN(i)new。 其中, RXREFVNd和 TXREFVNii 为根据实际噪声最大值所得到的参考 虚拟噪声, RXREFVN oldp和 TXREFVN{T) oldp为前次配置的参考虚拟噪声,
™^ (0 和^ ^ (0 为本次需配置的参考虚拟噪声, 为调整系数。 如果 为 0, 则新的参考虚拟噪声不考虑以前的虚拟参考噪声。
根据上下文,也可以利用接收端实际噪声的统计结果和当前配置的参考虚 拟噪声进行线性组合,得到更新的参考虚拟噪声, 将所述更新的参考虚拟噪声 确定为当前需要配置的参考虚拟噪声, 具体处理过程不再赘述。
本发明上述三个具体实施例中的方案还可以组合起来应用,如组合其中的 任意两种, 或组合上述三种。
上述各实施例中的系统或装置可以是存储在非易失性存储介质上的软件, 也可以是承载软件功能的硬件, 可以加载在局端 xDSL收发器中, 或者加载在 用户端 xDSL收发器中, 或者加载在管理局端 xDSL收发器的主机系统, 或者 加载在管理用户端 xDSL收发器的系统中。
以上所述的实施例,对本发明的目的、技术方案和有益效果进行了进一步 详细说明, 所应理解的是, 以上所述仅为本发明的较佳实施例而已, 并非用于 限定本发明的保护范围, 凡在本发明的精神和原则之内, 所作的任何修改、 等 同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求
1、 一种数字用户线 DSL参考虚拟噪声的确定方法, 其特征在于, 包括: 获取 DSL子载波的接收端实际噪声;
根据所述获取的子载波的接收端实际噪声, 确定参考虚拟噪声。
2、 如权利要求 1所述的方法, 其特征在于, 获取 DSL子载波的接收端实 际噪声具体釆用以下一种或者多种组合的方式:
收集在线重配置调整后的子载波的参数,利用所述收集到的重配置调整后 的子载波的参数和训练过程中得到的子载波的参数计算, 通过计算得到 DSL 子载波的接收端实际噪声;
收集训练后的子载波的参数, 利用所述收集到的子载波的参数计算,通过 计算得到 DSL子载波的接收端实际噪声; 及
从 DELT测试结果中得到 DSL子载波的接收端实际噪声。
3、 如权利要求 1所述的方法, 其特征在于, 所述根据所述获取的子载波 的接收端实际噪声, 确定参考虚拟噪声具体包括:
统计在一段时间内或预设次数内获取的子载波的接收端实际噪声,根据所 述接收端实际噪声的统计结果, 确定相应子载波的接收端参考虚拟噪声; 和 / 或
统计在一段时间内或预设次数内获取的子载波的接收端实际噪声,根据所 述接收端实际噪声的统计结果和训练过程中得到的子载波的衰减特性,确定相 应子载波的发送端参考虚拟噪声。
4、 如权利要求 3所述的方法, 其特征在于, 所述接收端实际噪声的统计 结果为: 对应子载波的接收端实际噪声最大值、或对应子载波的接收端实际噪 声次大值,或对应子载波的接收端实际噪声经过加权计算的接收端实际噪声加 权值。
5、 如权利要求 1 _ 4任意一项所述的方法, 其特征在于, 进一步包括: 将 所述确定的参考虚拟噪声和当前配置的参考虚拟噪声进行线性组合,得到更新 的参考虚拟噪声,将所述更新的参考虚拟噪声确定为当前需要配置的参考虚拟 噪声。
6、 如权利要求 1所述的方法, 其特征在于, 所述根据所述获取的子载波 的接收端实际噪声, 确定参考虚拟噪声具体包括:
将所述获取的子载波的实际噪声的统计结果和当前配置的子载波的参考 虚拟噪声进行线性组合,得到更新的参考虚拟噪声,将所述更新的参考虚拟噪 声确定为当前需要配置的参考虚拟噪声。
7、 如权利要求 5所述的方法, 其特征在于, 所述发送端为用户端, 所述 接收端为局端; 或者所述发送端为局端, 所述接收端为用户端。
8、 一种数字用户线 DSL配置方法, 其特征在于, 包括:
获取 DSL子载波的接收端实际噪声;
根据所述获取的子载波的接收端实际噪声, 确定参考虚拟噪声; 利用所述确定的参考虚拟噪声, 对 DSL的参考虚拟噪声参数进行配置。
9、 如权利要求 8所述的方法, 其特征在于, 根据所述获取的子载波的接 收端实际噪声, 确定参考虚拟噪声包括:
统计在一段时间内或预定次数内获取的子载波的接收端实际噪声,根据接 收端实际噪声的统计结果得到相应子载波的接收端参考虚拟噪声; 和 /或
统计在一段时间内或预定次数内获取的子载波的接收端实际噪声,根据接 收端实际噪声的统计结果和训练过程中得到的子载波的衰减特性,得到相应子 载波的发送端参考虚拟噪声; 其中,
所述接收端实际噪声的统计结果为: 对应子载波的接收端实际噪声最大 值、或对应子载波的接收端实际噪声次大值, 或对应子载波的接收端实际噪声 经过加权计算的接收端实际噪声加权值。
10、 一种数字用户线 DSL参考虚拟噪声的确定装置, 其特征在于, 包括 实际噪声获取模块和参考虚拟噪声确定模块,
所述实际噪声获取模块, 用于获取 DSL子载波的接收端实际噪声, 将与 所述子载波的接收端实际噪声相关的数据提供给所述参考虚拟噪声确定模块; 所述参考虚拟噪声确定模块,用于根据来自所述实际噪声获取模块的数据 确定参考虚拟噪声。
11、 如权利要求 10所述的装置, 其特征在于, 所述实际噪声获取模块包 括: 调整参数获取模块、 实际噪声计算模块和存储模块,
所述调整参数获取模块, 用于使能在线重配置特性 OLR时, 在预设的条 件内,获取因线路变化而触发 OLR功能进行线路参数调整后的子载波的参数, 将所述获取的参数提供给所述实际噪声计算模块;
所述实际噪声计算模块,用于根据所述调整参数获取模块提供的子载波的 参数, 以及训练过程中得到的子载波的参数, 计算得到 DSL子载波的接收端 实际噪声 , 将所计算的接收端实际噪声提供给所述存储模块进行存储;
所述存储模块,用于存储所述实际噪声获取模块提供的子载波的接收端实 际噪声。
12、 如权利要求 10所述的装置, 其特征在于, 所述实际噪声获取模块包 括: 训练参数获取模块、 实际噪声计算模块和存储模块,
所述训练参数获取模块, 用于重训练过程中,在预设的条件内获取训练后 的子载波的参数, 将所述获取的参数提供给所述实际噪声计算模块;
所述实际噪声计算模块,用于根据所述训练参数获取模块提供的各子载波 的参数, 计算得到 DSL子载波的接收端实际噪声, 将所计算的接收端实际噪 声提供给所述存储模块进行存储;
所述存储模块,用于存储所述实际噪声获取模块提供的子载波的接收端实 际噪声。
13、 如权利要求 10所述的装置, 其特征在于, 所述实际噪声获取模块包 括: DELT结果获取模块、 实际噪声确定模块和存储模块,
所述 DELT结果获取模块,用于获取 DELT的测试结果,将所获取的 DELT 测试结果提供给所述实际噪声确定模块;
所述实际噪声确定模块,用于从所述 DELT结果获取模块提供的 DELT测 试结果中, 获取 DSL子载波的接收端实际噪声, 将所获取的接收端实际噪声 提供给所述存储模块进行存储。
所述存储模块,用于存储所述实际噪声确定模块提供的各子载波上的接收 端实际噪声。
14、 如权利要求 10至 13所述的装置, 其特征在于,
所述与所述子载波的接收端实际噪声相关的数据为在一段时间内或预设 次数内获得的子载波的接收端实际噪声, 则所述参考虚拟噪声确定模块, 用于 统计所述一段时间内或预设次数内获得的子载波的接收端实际噪声 ,根据所述 接收端实际噪声的统计结果确定参考虚拟噪声; 或
所述与所述子载波的接收端实际噪声相关的数据为所述实际噪声获取模 块在一段时间内或预设次数内获取的子载波的接收端实际噪声的统计结果,则 所述参考虚拟噪声确定模块,用于根据所述接收端实际噪声的统计结果确定参 考虚拟噪声, 其中, 所述接收端实际噪声的统计结果为: 对应子载波上的接收 端实际噪声最大值、或对应子载波上的接收端实际噪声次大值, 或对应子载波 的接收端实际噪声经过加权计算的接收端实际噪声加权值。
15、 如权利要求 14所述的装置, 其特征在于, 所述参考虚拟噪声确定模 块包括:
第一参考虚拟噪声确定模块,用于根据所述接收端实际噪声的统计结果和 训练过程中得到的子载波的衰减特性, 确定相应子载波的发送端参考虚拟噪 声;
第二参考虚拟噪声确定模块, 用于根据接收端实际噪声的统计结果,确定 相应子载波的接收端参考虚拟噪声。
16、 如权利要求 10所述的装置, 其特征在于, 所述参考虚拟噪声确定模 块进一步包括:
虚拟噪声更新模块,用于将所述确定的参考虚拟噪声与当前配置的参考虚 拟噪声进行线性组合,得到更新的参考虚拟噪声, 将所述更新的参考虚拟噪声 确定为当前需要配置的参考虚拟噪声。
17、 一种数字用户线 DSL的配置系统, 其特征在于, 包括:
参考虚拟噪声确定装置, 用于获取 DSL子载波的接收端实际噪声, 根据 所述子载波的接收端实际噪声, 确定参考虚拟噪声;
线路模板模块, 用于根据所述参考虚拟噪声确定装置提供的参考虚拟噪 声, 对 DSL的参考虚拟噪声参数进行配置。
18、 如权利要求 16所述的配置系统, 其特征在于, 所述参考虚拟噪声确 定装置进一步将所述确定的参考虚拟噪声与当前配置的参考虚拟噪声进行线 性组合,得到更新的参考虚拟噪声,将所述更新的参考虚拟噪声确定为当前需 要配置的参考虚拟噪声。
19、 如权利要求 16所述的配置系统, 其特征在于, 所述参考虚拟噪声确 定装置进一步用于将所述子载波的接收端实际噪声的统计结果和当前配置的 参考虚拟噪声进行线性组合,得到更新的参考虚拟噪声, 将所述更新的参考虚 拟噪声确定为当前需要配置的参考虚拟噪声。
20、 如权利要求 16所述的配置系统, 其特征在于, 所述配置系统加载在 如下至少一个装置中:
局端 xDSL收发器, 用户端 xDSL收发器, 管理局端 xDSL收发器的主机 系统, 和管理用户端 xDSL收发器的系统。
21、一种记录有计算机可读程序的计算机可读存储介质, 该程序使得计算 单元执行 ¾口下方法:
获取 DSL子载波的接收端实际噪声;
根据所述获取的子载波的接收端实际噪声, 确定参考虚拟噪声。
PCT/CN2008/070410 2007-03-20 2008-03-05 Procédé de détermination et dispositif correspondant, ainsi que procédé de configuration et système correspondant, destinés au bruit virtuel de référence dans dsl WO2008113280A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP08715146A EP2120348B1 (en) 2007-03-20 2008-03-05 A determination method and corresponding device, as well as a configuration method and corresponding system for dsl reference virtual noise
AT08715146T ATE500664T1 (de) 2007-03-20 2008-03-05 Feststellungsverfahren und entsprechendes gerät, einstellungsverfahren und entsprechende anordnung für dsl virtuales referenzgeräusch
DE602008005273T DE602008005273D1 (de) 2007-03-20 2008-03-05 Feststellungsverfahren und entsprechendes gerät, einstellungsverfahren und entsprechende anordnung für dsl virtuales referenzgeräusch
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