WO2011022968A1 - 一种消除多载波调制系统中混叠噪声的方法、装置和系统 - Google Patents

一种消除多载波调制系统中混叠噪声的方法、装置和系统 Download PDF

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Publication number
WO2011022968A1
WO2011022968A1 PCT/CN2010/071377 CN2010071377W WO2011022968A1 WO 2011022968 A1 WO2011022968 A1 WO 2011022968A1 CN 2010071377 W CN2010071377 W CN 2010071377W WO 2011022968 A1 WO2011022968 A1 WO 2011022968A1
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Prior art keywords
frequency band
subcarriers
noise
difference
aliasing
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PCT/CN2010/071377
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English (en)
French (fr)
Inventor
薄会健
吴涛
张勇军
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP10811134.5A priority Critical patent/EP2442510B1/en
Publication of WO2011022968A1 publication Critical patent/WO2011022968A1/zh
Priority to US13/354,160 priority patent/US8923454B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier

Definitions

  • the invention relates to a method, device and system for eliminating aliasing noise in a multi-carrier modulation system.
  • the priority of the Chinese application of the method, the device and the system of the present invention is incorporated herein by reference.
  • TECHNICAL FIELD The present invention relates to the field of communications, and more particularly to a method, apparatus, and system for eliminating aliasing noise in a multi-carrier modulation system. Background technique
  • Digital Subscriber Line (DSL) technology is a high-speed transmission technology that uses Unshielded Twist Pair (UTP) to transmit data, including Asymmetrical Digital Subscriber Line (ADSL).
  • Asymmetrical Digital Subscriber Line (ADSL) Very-high-bit-rate Digital Subscriber Line (VDSL), ISDN Digital Subscriber Line (IDSL) based on Integrated Services Digital Network (ISDN), single-pair high-speed digital Single-pair High-bit-rate Digital Subscriber Line (SHDSL), Asymmetric Digital Subscriber Line 2 (ADSL2), Asymmetric Digital Subscriber Line (Asymmetrical Digital Subscriber Line) 2plus, ADSL2plus) and the second generation of Very High-bit-rate Digital Subscriber Line 2 (VDSL2).
  • VDSL Very-high-bit-rate Digital Subscriber Line
  • IDSL ISDN Digital Subscriber Line
  • ISDN Integrated Services Digital Network
  • SHDSL single-pair high-speed digital Single-pair High-bit-rate Digital Subscriber Line
  • ADSL2 Asymmetric Digital Subscriber Line 2
  • DSL and POTS digital subscriber line
  • DSL and SHDSL DSL and SHDSL
  • POTS traditional telephone service
  • the transceiver of the roadside machine 102 and the transceiver of the local office (C) office 100 share a bundle of cables.
  • the signal sent by the CO room 100 transmitter reaches the far end after a line (E-side length). Due to the attenuation, the signal is weak when reaching the far end. If the signal sent by the roadside machine rejects 102 is more than certain.
  • the amplitude will cause serious crosstalk to the signal sent by the transmitter of the CO room 100, thereby affecting the performance and stability of the signal sent by the transmitter of the CO room 100, and even causing the user to go offline.
  • the transmitter of the CO room 100 transmits the ADSL signal
  • the transmitter of the roadside machine rejects 102 transmits the VDSL signal
  • the signal of the ADSL signal reaching the roadside machine rejects 102 is the ADSL signal 200, due to the roadside
  • the amplitude of the VDSL signal transmitted by the machine reject 102 exceeds a certain amplitude. Therefore, the VDSL signal transmitted by the transmitter of the roadside machine 102 rejects the crosstalk noise 202 and the crosstalk noise 204 of the ADSL signal 200, and is aliased to the band. Inside, aliasing noise is formed, which affects the performance and stability of the ADSL signal 200.
  • the existing method is to reduce the power of the signal transmitted by the roadside machine rejecting 102, that is, DPBO (downstream Power Back Off) , downlink power back).
  • DPBO downstream Power Back Off
  • the signal transmitted by the transmitter of the roadside machine 102 is less affected by the crosstalk of the ADSL signal 200, and theoretically does not alias into the band to affect the ADSL signal 200, but due to At present, the anti-aliasing filtering of most modem modems is not well performed.
  • the crosstalk noise generated by the signal transmitted by the roadside machine rejecting the 102 transmitter will be aliased into the band, as shown in FIG. Aliasing aliasing into the band can affect the performance and stability of the signals in the band.
  • Embodiments of the present invention provide a method, apparatus, and system for eliminating aliasing noise in a multi-carrier modulation system.
  • the provided method, apparatus, and system can eliminate crosstalk noise of out-of-band subcarrier aliasing into a band.
  • Embodiments of the present invention provide a method for eliminating aliasing noise in a multi-carrier modulation system, where a range covered by a sub-carrier frequency of the multi-carrier modulation system is divided into two non-overlapping portions including at least a first frequency band and a second frequency band. Frequency band, each frequency band comprising one or more subcarrier frequencies, the method comprising the steps of:
  • a subcarrier signal in the second frequency band is transmitted according to the second power spectral density template.
  • the embodiment of the invention provides a central office device, including:
  • a first acquiring unit configured to acquire a first power spectral density template of the subcarriers in the second frequency band
  • a second acquiring unit configured to acquire carrier information of the subcarriers in the first frequency band, and acquire an alias of the subcarriers in the first frequency band a difference between the noise and the background noise, where the first frequency band and the second frequency band do not overlap
  • an adjusting unit configured to adjust the first power language template according to the carrier information of the sub-carriers in the first frequency band acquired by the second acquiring unit, and the corresponding difference, to obtain a second power spectral density template; And transmitting a subcarrier signal in the second frequency band according to the second power spectral density template.
  • the embodiment of the present invention provides a multi-carrier communication system, which includes a first central office device and a second central office device, where the first central office device is connected to the second central office device, where
  • the first central office equipment is configured to send subcarriers in a first frequency band
  • the second a first power spectral density template for acquiring subcarriers in the second frequency band, and acquiring carrier information of the subcarriers in the first frequency band, and calculating aliasing noise and background noise of the subcarriers in the first frequency band
  • adjusting the first power spectrum template according to the carrier information of the subcarriers in the first frequency band and the corresponding difference a second power spectral density template after obtaining the second power spectral density template, transmitting a subcarrier signal in the second frequency band according to the second power spectral density template, where the second frequency band does not overlap with the first frequency band .
  • Embodiments of the present invention provide a method, apparatus, and system that can obtain a difference between aliased noise and original background noise after performing DPBO, and adjust the transmit power of the out-of-band subcarrier according to the difference, because the difference is generated due to The crosstalk noise is aliased. Therefore, after adjusting the transmit power of the outband subcarrier according to the difference, the aliasing crosstalk noise can be eliminated, thereby improving the performance and stability of the inband service, and the process does not need to be used for the UE.
  • Equipment upgrades and changes have the advantage of being simple to implement.
  • Figure 1 is a schematic diagram showing the structure of the signal of the existing central office equipment and the signal rejected by the roadside machine transmitted to the user through the same bundle;
  • Figure 2 is a schematic diagram of full-band aliasing of out-of-band crosstalk noise into the band
  • Figure 3 is a schematic diagram of theoretically no aliasing noise after anti-aliasing filtering
  • Figure 4 is a schematic diagram of aliasing crosstalk noise after actually performing anti-aliasing filtering
  • FIG. 5 is a flowchart of a method according to Embodiment 1 of the present invention.
  • Embodiment 6 is a flowchart of a method provided by Embodiment 2 of the present invention.
  • FIG. 8 is a schematic structural diagram of a device according to Embodiment 4 of the present invention.
  • FIG. 9 is a schematic diagram showing the structure of a second acquiring unit in the apparatus provided in Embodiment 4 of the present invention
  • FIG. 10 is a schematic diagram showing the structure of a system according to Embodiment 5 of the present invention.
  • Embodiments of the present invention provide a method, apparatus, and system for eliminating aliasing noise in a multi-carrier modulation system.
  • the range covered by the subcarrier frequency is divided into two non-overlapping frequency bands including at least the first frequency band and the second frequency band, each frequency band including one or more sub-bands Carrier frequency.
  • multiple central office devices transmit traffic to remote users through a bundle of lines, and each central office device transmits signals in its corresponding frequency band.
  • the crosstalk of the subcarriers generated between the multiple central office devices on the bundle line may affect the service, for example, the subcarriers in the first frequency band of the central office equipment of the first central office equipment and the second central office equipment Roadside
  • the subcarriers in the second frequency band of the machine rejection are transmitted to the remote user equipment through a bundle.
  • crosstalk noise is generated on the subcarriers from the central office equipment.
  • the filtering performance of the existing anti-aliasing filter of most modems is not good, the crosstalk generated by the subcarriers rejected by the roadside machine is aliased into the subcarriers from the central office equipment, thereby The crosstalk noise is generated for the subcarriers from the central office equipment, and the crosstalk noise that is aliased into is the aliasing noise.
  • a first embodiment of the present invention provides a method for eliminating aliasing noise in a multi-carrier modulation system.
  • the sub-carrier generated by the central office equipment is a sub-carrier in the first frequency band, which is referred to as an in-band sub-carrier;
  • the subcarriers rejected by the edge machine are subcarriers in the second frequency band, which are simply referred to as outband subcarriers.
  • the method provided includes:
  • Step 500 Acquire a first power spectral density template.
  • the first power spectral density template includes a transmit power spectrum of the out-of-band subcarrier that the roadside machine refuses to transmit.
  • Step 510 Acquire carrier information of the inband subcarrier, and obtain a difference between the aliased noise of the inband subcarrier and the background noise.
  • the acquired carrier information of the in-band subcarrier includes carrier information of the in-band subcarrier that acquires the aliasing noise greater than the background noise, and one or more values of the carrier information, such as the carrier frequency value, the carrier number, and the number of subcarriers.
  • Step 520 Adjust the first power spectrum template according to the information of the in-band subcarrier and the corresponding difference to obtain a second power spectral density template.
  • the power of the corresponding out-of-band subcarrier in the first power spectral density template is adjusted according to the correspondence of the crosstalk, and the adjustment method in this embodiment is to use the outband.
  • the power of the subcarrier is subtracted from the difference of the corresponding inband subcarrier.
  • Step 530 Send a signal according to the second power spectral density template.
  • the method for eliminating aliasing noise provided in this embodiment further calculates the difference between the aliasing noise of the current in-band subcarrier and the background noise after acquiring the first power spectral density template, and calculates the obtained difference pair out-of-band.
  • the transmit power of the carrier is adjusted to generate a new power language template, and the signal is transmitted according to the new power spectrum template.
  • the new power spectrum template considers the filtering performance of the Modem anti-aliasing filter, that is, considering the aliasing noise. Closer to the actual crosstalk noise situation, the aliasing noise can be eliminated.
  • a second embodiment of the present invention provides a method for eliminating aliasing noise.
  • the method includes the following steps: Step 600: The roadside machine refuses to acquire the first power spectral density template.
  • the roadside machine refuses to obtain the first power spectral density template.
  • the first power spectral density template is used to specify the transmission power spectrum of the roadside machine rejecting the transmitted subcarrier, which may be the final DPBO known to those skilled in the art.
  • the power spectrum template RESULT TMASK in which the roadside machine refuses to obtain the first power spectral density template, can adopt the DPBO related calculation method, such as the maximum frequency point F1 point calculation or the minimum power spectral density mask (DPBO Minimum) that can be reduced.
  • the first power spectral density template can also be configured in the roadside machine rejection configuration database, and the roadside machine refuses to obtain the configuration database rejected by the roadside machine.
  • Step 610 The roadside machine refuses to receive the carrier information of the inband subcarriers sent by the central office equipment and the corresponding difference.
  • the carrier information of the inband subcarrier may be one or more of a carrier frequency value of a subcarrier, a carrier number, and a number of subcarriers.
  • the central office equipment measures the current background noise of the in-band subcarriers and compares it with the original background noise to find the frequency range of the subcarriers whose background noise is raised.
  • the background noise is raised because of the anti-aliasing of the Modem.
  • the filter performance of the filter is not good, causing the out-of-band subcarriers to alias the crosstalk noise of the in-band subcarriers into the band, and the aliasing noise is higher than the background noise.
  • the central office equipment acquires carrier information of the inband subcarriers in the frequency range, and calculates a difference between the aliasing noise and the background noise of the inband subcarriers in the frequency range, and uses the network management to inband the subcarriers in the frequency range.
  • the carrier information and the corresponding difference are sent to the roadside machine to reject.
  • Step 620 The roadside machine refuses to adjust the power of the corresponding out-of-band subcarrier in the first power spectral density template according to the received difference.
  • the outband subcarrier Due to the crosstalk between the inband subcarrier and the outband subcarrier, for example, according to the symmetric relationship, the outband subcarrier will generate crosstalk noise for the corresponding inband subcarrier, and the roadside machine refuses to receive the subcarrier information and corresponding After the difference, according to the correspondence of the crosstalk (such as the symmetric relationship), the power of the corresponding out-of-band subcarrier is found in the first power spectral density template, and the difference of the corresponding in-band subcarrier is subtracted, so that the first The power spectral density template is adjusted to obtain a second power spectral density template.
  • Step 630 the roadside machine refuses to send a signal according to the second power spectral density template.
  • the method for eliminating aliasing noise provided by this embodiment further considers after performing DPBO.
  • the filtering condition of the Modem is obtained by calculating the information of the subcarrier whose background noise is raised, and calculating the amplitude of the background noise being raised.
  • the calculation method may be to subtract the original background noise from the background noise after the elevation, according to the amplitude
  • the transmit power of the out-of-band subcarriers is adjusted, thereby eliminating aliasing noise that is aliased into the band, and improving the performance and stability of the in-band service.
  • a third embodiment of the present invention provides a method for eliminating aliasing noise. As shown in FIG. 7, the method includes the following steps: Step 700: The roadside machine refuses to acquire the first power spectral density template.
  • step 710 the roadside machine refuses to calculate the crosstalk noise generated by the outband subcarrier and the background noise of the inband subcarrier.
  • the crosstalk noise generated by the outband subcarrier is the crosstalk noise generated by the inband subcarrier of the outband subcarrier pair.
  • a method of calculating crosstalk noise generated by out-of-band subcarriers and background noise of in-band subcarriers may employ a far-end crosstalk (FEXT) calculation method well known to those skilled in the art.
  • FXT far-end crosstalk
  • step 720 the roadside machine refuses to calculate the crosstalk noise that is aliased into the band.
  • the aliasing attenuation coefficient ATTENCOEFICIENT(i) is added, where i is the sequence number of the subcarrier carrying the bit data.
  • the aliasing attenuation coefficient of the subcarrier configuration can be obtained by testing or provided by the manufacturer providing the modem; the aliasing attenuation coefficient of the subcarrier configuration can be fixed or dynamically adjusted, for example, according to the actual test result.
  • the roadside machine rejects the crosstalk noise generated by the outband subcarrier, and the crosstalk noise generated by the outband subcarrier is subtracted from the corresponding aliasing attenuation coefficient to obtain the crosstalk noise that is aliased into the band. Since the out-of-band subcarrier and the in-band subcarrier have a crosstalk correspondence relationship, the crosstalk interference of each out-of-band subcarrier may be determined according to the crosstalk corresponding relationship between the out-of-band subcarrier and the in-band subcarrier.
  • Step 730 the roadside machine refuses to obtain the number of in-band subcarriers capable of carrying bit data in the inband signal.
  • the acquisition of the F1 point should be well known to those skilled in the art, and will not be described here.
  • the Nth subcarrier is the largest subcarrier capable of carrying bit data in the inband signal.
  • Step 760 The roadside machine refuses to adjust the first power spectral density template according to the difference of the in-band subcarriers.
  • the power of the corresponding out-of-band subcarrier in the first power spectral density template is adjusted according to the correspondence of the crosstalk, and the adjustment method in this embodiment is to use the outband.
  • the power of the subcarrier is subtracted from the difference of the corresponding inband subcarrier.
  • Step 770 The roadside machine refuses to send a signal according to the adjusted first power spectral density template.
  • an aliasing attenuation coefficient is added in the DPBO parameter table, and after the DPBO acquires the first power spectral density template, the aliasing is calculated according to the increased aliasing attenuation coefficient.
  • Stacking noise obtaining the amplitude of the background noise being raised, adjusting the transmission power of the out-of-band subcarrier according to the amplitude, so that the aliasing noise can be eliminated under the condition that the filtering performance of the Modem anti-aliasing filter is not good, provided The method is completely rejected by the roadside machine, and there is no need to upgrade or change the remote device CPE.
  • the fourth embodiment of the present invention provides a central office device.
  • the central office device can be a roadside device.
  • the method includes: a first obtaining unit 800, a second obtaining unit 810, an adjusting unit 820, and a user.
  • the first obtaining unit 800 is configured to acquire a first power spectral density template.
  • the first power spectral density template acquired by the first obtaining unit 800 may be RESULT TMASK, and the method for obtaining the first power spectral density template may be using DPBO, or reading pre-configured data or the like.
  • the second obtaining unit 810 is configured to obtain information about the in-band subcarrier, and acquire a difference between the aliased noise of the in-band subcarrier and the background noise.
  • the second obtaining unit 810 includes a calculating module 900 and a determining module 910, where the calculating module 900 is configured to calculate crosstalk noise generated by the out-of-band subcarrier and background noise of the in-band subcarrier, and the calculation method may adopt the FEXT. Calculating, etc., according to the crosstalk noise generated by the out-of-band subcarrier and the pre-configured aliasing attenuation coefficient, the crosstalk noise aliased to the corresponding in-band subcarrier is obtained, that is, the pair is obtained.
  • the aliasing noise of the subcarriers should be in-band.
  • the calculation module 900 is further configured to acquire the number N of subcarriers capable of carrying bit data in the band.
  • the determining module 910 is configured to determine whether the aliasing noise of the Nth in-band subcarrier is greater than the background noise, and if yes, notify the calculating unit to calculate a difference between the aliasing noise and the background noise.
  • the adjusting unit 830 is configured to obtain a second power spectral density template according to the in-band subcarrier information in the frequency range acquired by the second obtaining unit 810 and the corresponding difference adjusting the first power spectrum template.
  • the adjusting unit 830 obtains the corresponding out-of-band subcarrier information in the first power spectral density template according to the crosstalk correspondence between the inband subcarrier and the outband subcarrier, and adjusts the power of the outband subcarrier according to the difference of the inband subcarriers, thereby forming Second power spectral density template.
  • the user interface unit 850 is configured to send a signal according to the second power spectral density template.
  • the provided central office device further includes a network interface unit 840 for receiving a frequency range of in-band subcarriers from the central office equipment, and aliasing noise and background noise of the inband subcarriers in the frequency range. The difference.
  • the network interface unit 840 After receiving the in-band subcarrier information and the corresponding difference, the network interface unit 840 notifies the adjustment unit 830 to adjust the first power spectral density template.
  • the central office equipment provided in this embodiment can calculate the crosstalk noise that is aliased into the band. After obtaining the difference between the aliasing noise and the background noise, the power spectral density template calculated by the DPBO is adjusted according to the difference, so that The transmit power of the out-of-band subcarrier can be adjusted according to the crosstalk noise actually received by the in-band subcarrier, thereby eliminating the aliasing noise. This process does not require upgrading and changing the CPE.
  • a fifth embodiment of the present invention provides a multi-carrier communication system.
  • the method includes: a first central office device 1000, a second central office device 1010, and a user equipment 1020.
  • the first central office device 1000 can be a central office equipment room.
  • the device, the second central office device can be a roadside machine.
  • the second central office device 1010 is configured to obtain a first power spectral density template, and obtain information of an in-band subcarrier whose aliasing noise is greater than background noise, and obtain a difference between the aliasing noise of the in-band subcarrier and the background noise.
  • the roadside machine After acquiring the difference between the aliasing noise of the in-band subcarrier and the background noise, adjusting the power of the corresponding out-of-band subcarrier in the first power language template according to the difference to obtain a second power spectral density template. After obtaining the second power spectral density template, the signal is transmitted in accordance with the second power spectral density template.
  • the roadside machine rejects 1010 and can also receive the frequency range of the inband subcarriers from the central office equipment 1000, and the difference between the aliasing noise and the background noise of the inband subcarriers in the frequency range, and receive the equipment in the central office room. After the 1000 sends the information, the roadside machine rejects 1010 and can also adjust the first power spectral density template based on the information.
  • the system for eliminating aliasing noise provided by this embodiment further calculates the crosstalk noise that is aliased into the band due to the filtering performance of the anti-aliasing filter of the Modem after acquiring the first power spectral density template by the DPBO, and the aliasing is In-band crosstalk noise will increase the background noise of the in-band subcarriers.
  • the transmit power of the out-of-band subcarriers is adjusted to eliminate aliasing noise.

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Description

一种消除多载波调制系统中混叠噪声的方法、 装置和系统 本申请要求了 2009年 08月 27日提交的， 申请号为 CN200910189901.9,发 明名称为 "一种消除多载波调制系统中混叠噪声的方法、 装置和系统" 的中国 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 本发明涉及通信领域， 尤其涉及多载波调制系统中消除混叠噪声的方法、 装置和系统。 背景技术
数字用户线 （Digital Subscriber Line, DSL )技术是一种利用无屏蔽双绞线 ( Unshielded Twist Pair, UTP )来传输数据的高速传输技术， 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 )、第二代非对称数字用户线 plus ( Asymmetrical Digital Subscriber Line 2plus, ADSL2plus )和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（xDSL )技术中， 除了 IDSL和 SHDSL夕卜， 普遍采用通 带传输， 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。 通带传输的 xDSL采用离散多音频调制 （ Discrete Multi-Tone Modulation, DMT )技术进行调制和解调。
随着 DSL技术的发展， 传输速率越来越高， 频谱范围也越来越宽， 在实际 应用中， 存在很多不同 DSL混合组网的应用场景， 这使得串扰噪声对业务影响 越来越严重。 如图 1 所示， 路边机拒 (Cabinet)102 的收发信机和本地交换局 CO(Central office)机房 100的收发信机共用一捆线缆。 CO机房 100发信机发送 的信号经过一段线路 (E-side length)后到达远端， 由于衰减， 到达远端时信号已 经很弱，如果路边机拒 102的发信机发送的信号超过一定幅值，就会对 CO机房 100的发信机发送的信号产生严重串扰，从而影响 CO机房 100的发信机发送的 信号的性能和稳定性， 甚至引起用户下线。
如图 2所示， 假设 CO机房 100的发信机发送 ADSL信号， 路边机拒 102 的发信机发送 VDSL信号， ADSL信号到达路边机拒 102处的信号为 ADSL信 号 200， 由于路边机拒 102发送的 VDSL信号的幅度超过了一定的幅值， 因此， 路边机拒 102的发信机发送的 VDSL信号会对 ADSL信号 200产生串扰噪声 202 和串扰噪声 204， 并混叠到带内， 形成混叠噪声， 这样会影响 ADSL信号 200 的性能和稳定性。
为了减少路边机拒 102发信机发送的信号对 ADSL信号 200的串扰影响， 现有的做法是降低路边机拒 102的发信机发送信号的功率， 也就是进行 DPBO ( Downstream Power Back Off, 下行功率回退）。 如图 3所示， 经过 DPBO后， 路边机拒 102的发信机发送的信号对 ADSL信号 200的串扰影响会较小， 理论 上不会混叠到带内来影响 ADSL信号 200， 但是由于目前大多数调制解调器 Modem的抗混叠滤波做得不好， 因此， 经过 DPBO后， 路边机拒 102的发信机 发送的信号产生的串扰噪声会被混叠到带内， 如图 4所示， 混叠到带内的混叠 噪声会影响带内的信号的性能和稳定性。
发明内容
本发明实施例提供一种消除多载波调制系统中混叠噪声的方法、 装置和系 统， 所提供的方法、 装置和系统能消除带外子载波混叠到带内的串扰噪声。
本发明实施例提供一种消除多载波调制系统中混叠噪声的方法， 所述多载 波调制系统的子载波频率所覆盖的范围被划分成至少包括第一频带和第二频带 的两个不重叠的频带， 每个频带包括一个或多个子载波频率， 所述方法包括步 骤：
获取第二频带内子载波的第一功率谱密度模板； 获取第一频带内子载波的载波信息， 并获取所述第一频带内子载波的混叠 噪声与背景噪声的差值；
才艮据所述第一频带内子载波的载波信息和对应的所述差值调整所述第一功 率语模板得到第二功率谱密度模板；
按照所述第二功率谱密度模板发送第二频带内的子载波信号。
本发明实施例提供一种局端设备， 包括：
第一获取单元， 用于获取第二频带内子载波的第一功率谱密度模板； 第二获取单元， 用于获取第一频带内子载波的载波信息， 并获取所述第一 频带内子载波的混叠噪声与背景噪声的差值， 其中， 所述第一频带和第二频带 不重叠；
调整单元， 用于根据所述第二获取单元获取的第一频带内子载波的载波信 息和对应的差值调整所述第一功率语模板， 从而得到第二功率谱密度模板； 用户接口单元， 用于按照所述第二功率谱密度模板发送第二频带内的子载 波信号。
本发明实施例提供一种多载波通信系统， 包括第一局端设备和第二局端设 备， 所述第一局端设备和所述第二局端设备相连， 其中，
所述第一局端设备， 用于发送第一频带内子载波；
所述第二， 用于获取第二频带内子载波的第一功率谱密度模板， 以及获取 所述第一频带内子载波的载波信息， 计算所述第一频带内子载波的混叠噪声与 背景噪声的差值； 在获取所述第一频带内子载波的载波信息以及对应的差值后， 根据所述第一频带内子载波的载波信息和对应的所述差值调整所述第一功率谱 模板得到第二功率谱密度模板； 在获得第二功率谱密度模板后， 按照所述第二 功率谱密度模板发送第二频带内的子载波信号， 其中， 所述第二频带与所述第 一频带不重叠。
本发明实施例提供方法、 装置和系统能在进行 DPBO后， 获取混叠噪声与 原始背景噪声的差值， 根据这个差值来调整带外子载波的发送功率， 由于这个 差值的产生是由于混叠了串扰噪声， 因此， 根据这个差值来调整带外子载波的 发送功率后， 可以消除混叠串扰噪声， 从而提高了带内业务的性能和稳定性， 这一过程不需要对用户端设备进行升级和更改， 具有实现简单的优点。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面描述 中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付 出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1 为现有的局端机房设备的信号与路边机拒的信号通过同一捆线传输到 用户的架构的示意图；
图 2为带外串扰噪声全幅度混叠到带内的示意图；
图 3为理论上进行抗混叠滤波后无混叠噪声的示意图；
图 4为实际上进行抗混叠滤波后混叠了串扰噪声的示意图；
图 5为本发明实施例一所提供的方法的流程图；
图 6为本发明实施例二所提供的方法的流程图；
图 7为本发明实施例三所提供的方法的流程图；
图 8为本发明实施例四所提供的装置的结构示意图；
图 9为本发明实施例四所提供的装置中的第二获取单元的结构的示意图； 图 10为本发明实施例五所提供的系统的结构的示意图。
具体实施例
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
本发明实施例提供了一种消除多载波调制系统中混叠噪声的方法、 装置和 和系统。 特别的， 在本发明实施例的多载波调制系统中， 子载波频率所覆盖的 范围被划分成至少包括第一频带和第二频带的两个不重叠的频带， 每个频带包 括一个或多个子载波频率。 例如， 在一些混合组网的场合中， 多个局端设备通 过一捆线为远端用户传输业务， 每一个局端设备以其对应的频带发送信号。 多 个局端设备间产生的子载波在该捆线上的串扰会对业务产生影响， 例如作为第 一局端设备的局端机房设备的第一频带内的子载波与作为第二局端设备的路边 机拒的第二频带内的子载波通过一捆线传输到远端用户设备， 当路边机拒的子 载波的功率超过一定的幅度时， 会对来自局端机房设备的子载波产生串扰噪声， 而由于现有的大多数 Modem的抗混叠滤波器的滤波性能不好， 因此， 路边机拒 的子载波产生的串扰噪声会被混叠到来自局端机房设备的子载波内， 从而对来 自局端机房设备的子载波产生串扰噪声， 混叠进去的串扰噪声即混叠噪声。
本发明实施例一提供一种消除多载波调制系统中混叠噪声的方法， 在以下 实施例中， 作为举例， 局端机房设备产生的子载波为第一频带内子载波， 简称 带内子载波； 路边机拒产生的子载波为第二频带内子载波， 简称带外子载波， 如图 5所示， 所提供的方法包括：
步骤 500， 获取第一功率谱密度模板。
第一功率谱密度模板包含路边机拒发送的带外子载波的发送功率谱。
步骤 510， 获取带内子载波的载波信息， 并获取所述带内子载波的混叠噪声 与背景噪声的差值。
获取的带内子载波的载波信息包括获取混叠噪声大于背景噪声的带内子载 波的载波信息， 载波信息如载波频率值、 载波编号和子载波个数等一个或多个 值。
步骤 520，根据所述带内子载波的信息以及对应的差值调整所述第一功率谱 模板得到第二功率谱密度模板。
获取带内子载波的混叠噪声和背景噪声的差值后， 根据串扰的对应关系， 调整第一功率谱密度模板中对应的带外子载波的功率， 本实施例中的调整方法 为用带外子载波的功率减去对应的带内子载波的差值。
步骤 530， 按照所述第二功率谱密度模板发送信号。
本实施例提供的消除混叠噪声的方法， 在获取第一功率谱密度模板后， 进 一步计算当前的带内子载波的混叠噪声与背景噪声的差值， 根据计算获取的差 值对带外子载波的发送功率进行调整， 生成新的功率语模板， 根据新的功率谱 模板发送信号， 新的功率谱模板考虑了 Modem的抗混叠滤波器的滤波性能， 即 考虑了混叠噪声的情况， 更接近于实际串扰噪声情况， 因而可以消除混叠噪声。
本发明实施例二提供一种消除混叠噪声的方法， 如图 6所示， 包括： 步骤 600， 路边机拒获取第一功率谱密度模板。 路边机拒获取第一功率频谱密度模板， 本实施例中第一功率谱密度模板用 于规定路边机拒发送子载波的发送功率谱， 可以是本领域普通技术人员知悉的 最终的带 DPBO的功率谱模板 RESULT TMASK,其中，路边机拒获取第一功率 频谱密度模板的方法可以采用 DPBO的相关计算方法， 如可消减的最大频率点 F1点计算或最小功率谱密度掩码（ DPBO Minimum Power Spectral Density Mask, DPBOMPSD )计算等； 第一功率频谱密度模板还可以配置在路边机拒的配置数 据库中， 路边机拒通过读取路边机拒上的配置数据库获得。 具体如何获取 RESULT TMASK, F1点计算和 DPBOMPSD计算的方法可以参考现有的方案， 在此不再阐述。
步骤 610， 路边机拒接收局端机房设备发送的带内子载波的载波信息以及对 应的差值。
带内子载波的载波信息可以是子载波的载波频率值、 载波编号和子载波个 数等一种或多种。
局端机房设备测量带内子载波的当前背景噪声， 并与原始背景噪声进行比 较， 找到背景噪声被抬高的子载波的频率范围， 背景噪声之所以会被抬高， 是 因为 Modem的抗混叠滤波器的滤波性能不好，导致带外子载波对带内子载波的 串扰噪声混叠到了带内， 而且混叠噪声高于背景噪声。
局端机房设备获取频率范围内的带内子载波的载波信息， 并计算这一频率 范围内的带内子载波的混叠噪声与背景噪声的差值， 通过网管将上述频率范围 内的带内子载波的载波信息与对应的差值发送给路边机拒。
步骤 620，路边机拒根据接收到的差值对第一功率谱密度模板中相应的带外 子载波的功率进行调整。
由于带内子载波与带外子载波之间存在串扰的对应关系， 比如根据对称关 系， 带外子载波会对相应的带内子载波产生串扰噪声等， 路边机拒在收到子载 波信息以及对应的差值后， 根据串扰的对应关系 （如对称关系）， 在第一功率谱 密度模板中找到相应的带外子载波的功率， 减去相应的带内子载波的差值， 这 样就对第一功率谱密度模板进行了调整， 从而得到第二功率谱密度模板。
步骤 630， 路边机拒根据第二功率谱密度模板发送信号。
本实施例提供的消除混叠噪声的方法， 在进行 DPBO 后， 进一步考虑了 Modem的滤波情况， 通过计算获取背景噪声被抬高的子载波的信息， 并计算背 景噪声被抬高的幅度， 计算的方法可以是将抬高后的背景噪声减去原始背景噪 声， 根据这个幅度调整带外子载波的发送功率， 从而可以消除混叠到带内的串 扰噪声， 提高了带内业务的性能和稳定性。
本发明实施例三提供一种消除混叠噪声的方法， 如图 7所示， 包括： 步骤 700， 路边机拒获取第一功率谱密度模板。
路边机拒获取第一功率谱密度模板的方法， 本发明实施例二已经阐述， 在 此不再另外描述。
步骤 710，路边机拒计算带外子载波产生的串扰噪声和带内子载波的背景噪 声。
其中， 带外子载波产生的串扰噪声为带外子载波对对应的带内子载波产生 的串扰噪声。 计算带外子载波产生的串扰噪声和带内子载波的背景噪声的方法 可以采用本领域普通技术人员熟知的远端串扰（FEXT ) 的计算方法。
步骤 720， 路边机拒计算混叠到带内的串扰噪声。
在 DPBO的参数配置表中， 增加混叠衰减系数 ATTENCOEFICIENT(i), 其 中， i为带外能承载比特数据的子载波的序号。 子载波配置的混叠衰减系数可以 通过测试得到， 或者由提供 Modem的厂家提供； 子载波配置的混叠衰减系数可 以是固定的， 也可以动态调整， 例如 ^据实际测试的结果调整。
在第 710 中， 路边机拒已经获取了带外子载波产生的串扰噪声， 用带外子 载波产生的串扰噪声减去相应的混叠衰减系数即可得到混叠到带内的串扰噪 声。 由于带外子载波和带内子载波存在串扰的对应关系， 因此， 可以根据上述 带外子载波和带内子载波存在串扰的对应关系确定每个带外子载波混叠到带内 的串扰噪声所影响的是哪个或哪些带内子载波， 即定位每个带外子载波混叠到 带内的串扰噪声所影响的带内子载波， 这样， 可以获取带内子载波的混叠噪声。
步骤 730， 路边机拒获取带内信号中能承载比特数据的带内子载波的个数
N。
带内信号中能承载比特数据的带内子载波的个数 N=ceil(Fl/4312.5)， ceil为 向上取整函数， F1点的获得本领域普通技术人员都应熟知， 在此不再阐述， 其 中， 第 N个子载波为带内信号中能承载比特数据的最大的子载波。 步骤 740， 判断第 N个带内子载波的混叠噪声是否大于背景噪声。 路边机拒比较第 N个子载波的混叠噪声与背景噪声的大小， 当混叠噪声大 于背景噪声时， 执行步骤 750， 否则， 执行步骤 760。
步骤 750，路边机拒计算带内子载波混叠噪声和背景噪声的差值，令 N=N-1， 执行步骤 740。
步骤 760， 路边机拒根据带内子载波的差值调整第一功率谱密度模板。
获取带内子载波的混叠噪声和背景噪声的差值后， 根据串扰的对应关系， 调整第一功率谱密度模板中对应的带外子载波的功率， 本实施例中的调整方法 为用带外子载波的功率减去对应的带内子载波的差值。
步骤 770， 路边机拒根据调整后的第一功率谱密度模板发送信号。
本实施例提供的消除混叠噪声的方法， 在 DPBO参数表中增加混叠衰减系 数， 在进行 DPBO获取第一功率谱密度模板后， 根据增加的混叠衰减系数计算 混叠到带内的混叠噪声， 获取背景噪声被抬高的幅度， 根据这一幅度来调整带 外子载波的发送功率，从而可以在 Modem抗混叠滤波器的滤波性能不好的情况 下消除混叠噪声， 所提供的方法完全由路边机拒完成， 不需要对远端设备 CPE 进行升级或者更改。
本发明实施例四提供一种局端设备， 所提供的局端设备可以是路边机拒， 如图 8所示， 包括： 第一获取单元 800、 第二获取单元 810、 调整单元 820和用 户接口单元 850，
其中，
第一获取单元 800， 用于获取第一功率谱密度模板。
第一获取单元 800获取的第一功率谱密度模板可以是 RESULT TMASK,获 取第一功率谱密度模板的方法可以是采用 DPBO, 或者读取预先配置数据等。
第二获取单元 810， 用于获取带内子载波的信息， 并获取所述带内子载波的 混叠噪声与背景噪声的差值。
如图 9所示， 第二获取单元 810包括计算模块 900和判断模块 910， 其中， 计算模块 900用于计算带外子载波产生的串扰噪声以及带内子载波的背景 噪声， 计算的方法可以采用 FEXT计算等， 根据带外子载波产生的串扰噪声和 预先配置的混叠衰减系数得到混叠到对应的带内子载波的串扰噪声， 即得到对 应带内子载波的混叠噪声。
计算模块 900还用于获取带内能承载比特数据的子载波的数量 N。
判断模块 910, 用于判断第 N个带内子载波的混叠噪声是否大于背景噪声， 如果为是， 则通知计算单元计算混叠噪声与背景噪声的差值。
调整单元 830，用于根据第二获取单元 810获取的频率范围内的带内子载波 信息以及对应的差值调整第一功率谱模板得到第二功率谱密度模板。
调整单元 830根据带内子载波与带外子载波的串扰对应关系， 获取第一功 率谱密度模板中对应的带外子载波信息， 根据带内子载波的差值调整带外子载 波的功率， 从而形成第二功率谱密度模板。
用户接口单元 850， 用于按照所述第二功率谱密度模板发送信号。
所提供的局端设备还包括网络接口单元 840，网络接口单元 840用于接收来 自局端机房设备的带内子载波的频率范围， 以及所述频率范围内的带内子载波 的混叠噪声与背景噪声的差值。
网络接口单元 840收到带内子载波信息以及对应的差值后， 通知调整单元 830对第一功率谱密度模板进行调整。
本实施例提供的局端设备， 能够计算混叠到带内的串扰噪声， 在获取混叠 噪声和背景噪声的差值后， 根据这个差值调整通过 DPBO计算得到的功率谱密 度模板， 这样， 可以根据带内子载波实际受到的串扰噪声来调整带外子载波的 发送功率， 从而达到消除混叠噪声的目的， 这个过程不需要对 CPE进行升级和 更改。
本发明实施例五提供一种多载波通信系统， 如图 10所示， 包括： 第一局端 设备 1000、 第二局端设备 1010和用户设备 1020， 第一局端设备 1000可以是局 端机房设备， 第二局端设备可以是路边机拒。
其中，
第二局端设备 1010， 用于获取第一功率谱密度模板， 以及获取混叠噪声大 于背景噪声的带内子载波的信息， 并获取所述带内子载波的混叠噪声与背景噪 声的差值。
在获取带内子载波的混叠噪声与背景噪声的差值后， 根据所述差值调整所 述第一功率语模板中对应的带外子载波的功率得到第二功率谱密度模板。 在获得第二功率谱密度模板后， 按照所述第二功率谱密度模板发送信号。 路边机拒 1010还可以接收来自局端机房设备 1000的带内子载波的频率范 围， 以及所述频率范围内的带内子载波的混叠噪声与背景噪声的差值， 在收到 局端机房设备 1000发送的这些信息后， 路边机拒 1010也可以根据这些信息调 整第一功率谱密度模板。
本实施例提供的消除混叠噪声的系统， 在通过 DPBO获取第一功率谱密度 模板后，进一步计算由于 Modem的抗混叠滤波器的滤波性能导致混叠到带内的 串扰噪声， 混叠到带内的串扰噪声会导致带内子载波的背景噪声升高， 通过计 算带内子载波混叠噪声与原始背景噪声的差值， 进而调整带外子载波的发送功 率， 从而消除混叠噪声。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是 可以通过程序来指令相关的硬件完成， 所述的程序可以存储于一计算机可读存 储介质中， 如 ROM/RAM、 磁碟或光盘等。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限于 此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易想到 变化或替换， 都应涵盖在本发明的保护范围之内， 因此， 本发明的保护范围应 所述以权利要求的保护范围为准。

Claims

权利要求书
1、 一种消除多载波调制系统中混叠噪声的方法， 其特征在于， 所述多载波 调制系统的子载波频率所覆盖的范围被划分成至少包括第一频带和第二频带的 两个不重叠的频带， 每个频带包括一个或多个子载波频率， 所述方法包括步骤： 获取第二频带内子载波的第一功率谱密度模板；
获取第一频带内子载波的载波信息， 并获取所述第一频带内子载波的混叠 噪声与背景噪声的差值；
才艮据所述第一频带内子载波的载波信息和对应的所述差值调整所述第一功 率语模板得到第二功率谱密度模板；
按照所述第二功率谱密度模板发送第二频带内的子载波信号。
2、 根据权利要求 1所述的方法， 其特征在于， 所述获取第一频带内子载波 的载波信息包括： 获取第一频带内混叠噪声大于背景噪声的子载波的载波信息。
3、 根据权利要求 2所述的方法， 其特征在于， 所述获取带内子载波的载波 信息之前包括：
获取带内信号中能承载比特数据的带内子载波的个数 N;
所述获取第一频带内子载波的载波信息， 并获取所述第一频带内子载波的 混叠噪声与背景噪声的差值具体包括：
步骤 A: 获取第 N个子载波的背景噪声和第 N个子载波的混叠噪声； 步骤 B: 判断第 N个子载波的混叠噪声是否大于背景噪声， 如果为是， 则 计算混叠噪声与背景噪声的差值， 令 N=N-1， 执行步骤八。
4、 根据权利要求 3所述的方法， 其特征在于， 所述获取第一频带内子载波 的混叠噪声具体包括：
计算第二频带内子载波所产生的串扰噪声；
根据计算获得的串扰噪声和预先配置的混叠衰减系数得到混叠噪声。
5、 根据权利要求 1所述的方法， 其特征在于， 来自局端机房设备的子载波 所覆盖范围为第一频带， 则所述获取第一频带内子载波的载波信息， 并获取所 述第一频带内子载波的混叠噪声与背景噪声的差值具体包括：
接收来自局端机房设备的第一频带内子载波的载波信息， 以及对应的第一 频带内子载波的混叠噪声与背景噪声的差值。
6、 根据权利要求 1所述的方法， 其特征在于， 所述根据所述第一频带内子 载波的载波信息和对应的差值调整所述第一功率语模板具体包括：
根据第一频带内子载波与第二频带内子载波的串扰的对应关系， 获取所述 第一功率语模板中与所述第一频带内子载波的载波信息对应的第二频带内子载 波的功率；
根据对应的第一频带内子载波的差值调整所述第二频带内子载波的功率。
7、 根据权利要求 6所述的方法， 其特征在于， 所述根据对应的第一频带内 子载波的差值调整所述第二频带内子载波的功率具体为：
将所述第二频带内子载波的功率减去对应的第一频带内子载波的差值。
8、 一种局端设备， 其特征在于， 包括：
第一获取单元， 用于获取第二频带内子载波的第一功率谱密度模板； 第二获取单元， 用于获取第一频带内子载波的载波信息， 并获取所述第一 频带内子载波的混叠噪声与背景噪声的差值， 其中， 所述第一频带和第二频带 不重叠；
调整单元， 用于根据所述第二获取单元获取的第一频带内子载波的载波信 息和对应的差值调整所述第一功率语模板， 从而得到第二功率谱密度模板； 用户接口单元， 用于按照所述第二功率谱密度模板发送第二频带内的子载 波信号。
9、 根据权利要求 8所述的设备， 其特征在于， 所述局端设备还包括网络接 口单元，
所述网络接口单元， 用于接收来自局端机房设备的第一频带内子载波的载 波信息， 以及对应的第一频带内子载波的混叠噪声与背景噪声的差值。
10、 根据权利要求 8 所述的设备， 其特征在于， 所述第二获取单元具体包 括计算单元和判断单元，
所述计算单元， 用于计算第二频带内子载波产生的串扰噪声以及第一频带 内子载波的背景噪声， 以及计算第一频带内子载波的混叠噪声与背景噪声的差 值；
所述判断单元， 用于判断第一频带内第 N个子载波的混叠噪声是否大于背 景噪声， 如果为是， 则通知所述计算单元计算所述第一频带内第 N个子载波的 混叠噪声与背景噪声的差值。
11、 一种多载波通信系统， 其特征在于， 包括第一局端设备和第二局端设 备， 所述第一局端设备和所述第二局端设备相连， 其中，
所述第一局端设备， 用于发送第一频带内子载波；
所述第二， 用于获取第二频带内子载波的第一功率谱密度模板， 以及获取 所述第一频带内子载波的载波信息， 计算所述第一频带内子载波的混叠噪声与 背景噪声的差值； 在获取所述第一频带内子载波的载波信息以及对应的差值后， 根据所述第一频带内子载波的载波信息和对应的所述差值调整所述第一功率谱 模板得到第二功率谱密度模板； 在获得第二功率谱密度模板后， 按照所述第二 功率谱密度模板发送第二频带内的子载波信号， 其中， 所述第二频带与所述第 一频带不重叠。
12、 根据权利要求 10所述的系统， 其特征在于， 所述第二局端设备还用于 接收来自所述第一局端设备的第一频带内子载波的信息， 以及所述第一频带内 子载波的对应混叠噪声与背景噪声的差值。
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