WO2016045131A1 - 信道传输特性获取方法和装置 - Google Patents

信道传输特性获取方法和装置 Download PDF

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Publication number
WO2016045131A1
WO2016045131A1 PCT/CN2014/087701 CN2014087701W WO2016045131A1 WO 2016045131 A1 WO2016045131 A1 WO 2016045131A1 CN 2014087701 W CN2014087701 W CN 2014087701W WO 2016045131 A1 WO2016045131 A1 WO 2016045131A1
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Prior art keywords
transmission characteristic
channels
characteristic curve
channel
curve
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PCT/CN2014/087701
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English (en)
French (fr)
Inventor
张小龙
吕捷
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/087701 priority Critical patent/WO2016045131A1/zh
Priority to CN201480011328.1A priority patent/CN105659505B/zh
Priority to EP14902686.6A priority patent/EP3190714B1/en
Publication of WO2016045131A1 publication Critical patent/WO2016045131A1/zh
Priority to US15/471,955 priority patent/US10122410B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H04B3/48—Testing attenuation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/06—Control of transmission; Equalising by the transmitted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/12—Arrangements for observation, testing or troubleshooting
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6168—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving cable transmission, e.g. using a cable modem
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications

Definitions

  • the present invention relates to communication technologies, and in particular, to a channel transmission characteristic acquisition method and apparatus.
  • Hybrid Fiber-Coaxial (HFC) network technology is an economical and practical integrated digital service broadband network access technology.
  • the HFC usually consists of three parts: the optical fiber trunk line, the coaxial cable branch line and the user wiring network.
  • the program signal from the cable TV station first becomes the optical signal transmitted on the trunk line; after the user area, the optical signal is converted into an electrical signal, which is distributed.
  • the device is distributed to the user via a coaxial cable.
  • FIG. 1 is a schematic diagram of a typical HFC network.
  • the HFC network includes the following devices and devices: network management system, Proactive Network Maintenance (PNM) server, and coaxial cable office access.
  • PPM Proactive Network Maintenance
  • CMTS Cable Modem Terminal System
  • CM Optical Station
  • CM Cable Modem
  • STB Set Top Box
  • PC Personal Computer
  • fiber fiber
  • coaxial cable cable
  • amplifier attenuator and other devices
  • the transmission characteristic refers to the relationship between the input signal and the output signal through a certain device or channel, and is a parameter reflecting the quality and performance of a device or channel transmission.
  • the HFC network it mainly refers to the relationship between the attenuation characteristics of the signal passing through the network and the frequency. This relationship is also called the amplitude-frequency characteristic of the signal (the amplitude and frequency curve).
  • Each device, device, and cable existing in the HFC network has its own transmission characteristics, and the complexity of the network structure makes the transmission characteristics of each user (CM) to the head end (CMTS) have certain differences.
  • the transmission characteristics of the CM to the head end are widely used in the design and debugging of the HFC network, as well as in future operation and maintenance.
  • the appropriate device and the best cascading mode should be selected for the installation layout.
  • the optical device and amplifier should be debugged, and finally the users are kept.
  • Transmission characteristics consistency In terms of operation and maintenance, as the network usage time changes, the characteristics of each device will undergo different degrees of variation distortion (due to aging, water ingress corrosion, cable bending, etc.), which eventually causes the transmission characteristic curve of each user to be distorted. For example, fluctuations or unevenness occur, and even some users have more serious fault problems. At this time, it is necessary to analyze the transmission characteristics of the network to analyze the location of the fault and perform line adjustment.
  • the prior art usually uses a network analyzer or a spectrum analyzer to measure and analyze the network signal, but this method needs to be in the offline state of the entire HFC network, and cannot be in the HFC. The operation is performed in the working state; and the method requires that the network does not have other intrusion signals, such as noise interference, etc., if present, the intrusion signal is also measured by the instrument, thereby failing to correctly reflect the characteristics of the line, resulting in measurement and analysis results. Inaccurate.
  • the embodiment of the invention provides a channel transmission characteristic acquisition method and device, so as to obtain channel transmission characteristics when the HFC network is in working state, and improve the accuracy of the analysis result.
  • an embodiment of the present invention provides a method for acquiring a channel transmission characteristic, including:
  • a characteristic curve reflects an amplitude of a channel at each frequency point, and the at least two channels form a continuous frequency band, the at least two The frequency characteristics of the frequency corresponding to the transmission characteristic curve of the channel are the same in the order of magnitude, and the magnitude of the amplitude value is also the same;
  • the continuous curve is taken as a transmission characteristic curve of the continuous frequency band.
  • the transmitting the characteristic curve of the channel is translated in the amplitude direction, so that the amplitudes corresponding to the same frequency points of the respective transmission characteristic curves coincide to form a continuous curve, including :
  • the above steps are performed by continuing to the transmission characteristic curves corresponding to the frequency bands formed by adjacent channels until the transmission characteristic curves corresponding to all channels are connected into a continuous curve.
  • a transmission characteristic curve of one of the two adjacent channels is fixed, including: The transmission characteristic curve of a channel having a smaller frequency point in the adjacent channel is fixed.
  • a third possible implementation if there are multiple identical frequency points in the transmission characteristic curves of the two adjacent channels, The difference between the amplitudes corresponding to the same frequency points in the transmission characteristic curves of any two adjacent channels is calculated, and the difference is used as the first distance MovedV, including:
  • the acquiring a transmission characteristic curve of the at least two channels in the cable modem includes:
  • a transmission characteristic curve of each of the channels is obtained according to pre-equalization coefficients of the at least two channels.
  • the method further includes:
  • the transmission characteristic curve of the frequency band is shifted upward in the amplitude direction by the magnitude of the line attenuation power, and the absolute value of the transmission characteristic of the frequency band is obtained.
  • an embodiment of the present invention provides a channel transmission characteristic obtaining apparatus, including:
  • An acquisition module configured to acquire, by means of channel scanning, a transmission characteristic curve of at least two channels in the cable modem; a characteristic curve reflects a magnitude of a channel at each frequency point, The at least two channels form a continuous frequency band, and the frequency characteristics of the frequency points corresponding to the transmission characteristic curves of the at least two channels are the same in magnitude, and the magnitudes of the amplitude values are also the same;
  • a processing module configured to translate the transmission characteristic curve of the channel along the amplitude direction, so that the amplitudes corresponding to the same frequency points of the respective transmission characteristic curves coincide to form a continuous curve; and the continuous curve is used as the obtained Transmission characteristics of continuous frequency bands.
  • the processing module is specifically configured to:
  • the above steps are performed by continuing to the transmission characteristic curves corresponding to the frequency bands formed by adjacent channels until the transmission characteristic curves corresponding to all channels are connected into a continuous curve.
  • the processing module is specifically configured to:
  • a transmission characteristic curve of a channel having a smaller frequency point among any two adjacent channels is fixed.
  • the processing module is specifically configured to:
  • the acquiring module is specifically configured to:
  • a transmission characteristic curve of each of the channels is obtained according to pre-equalization coefficients of the at least two channels.
  • the acquiring module is further configured to:
  • the processing module is further configured to:
  • the transmission characteristic curve of the frequency band is shifted upward in the amplitude direction by the magnitude of the line attenuation power, and the absolute value of the transmission characteristic of the frequency band is obtained.
  • an embodiment of the present invention provides a server, including:
  • An interface circuit for acquiring a transmission characteristic curve of at least two channels in the cable modem by means of channel scanning; a characteristic curve reflects an amplitude of a channel at each frequency point, and the at least two channels form a continuous frequency band, The frequency characteristic values of the frequency corresponding to the transmission characteristic curves of the at least two channels are the same in magnitude, and the magnitudes of the amplitude values are also the same;
  • a processor configured to translate the transmission characteristic curve of the channel along the amplitude direction, so that the amplitudes corresponding to the same frequency points of the respective transmission characteristic curves coincide to form a continuous curve; and the continuous curve is used as the continuous The transmission characteristic curve of the frequency band.
  • the processor is specifically configured to:
  • the above steps are performed by continuing to the transmission characteristic curves corresponding to the frequency bands formed by adjacent channels until the transmission characteristic curves corresponding to all channels are connected into a continuous curve.
  • the processor is specifically configured to:
  • a transmission characteristic curve of a channel having a smaller frequency point among any two adjacent channels is fixed.
  • the processor is specifically configured to:
  • the interface circuit is specifically configured to:
  • a transmission characteristic curve of each of the channels is obtained according to pre-equalization coefficients of the at least two channels.
  • the interface circuit is further configured to:
  • the processor is further configured to:
  • the transmission characteristic curve of the frequency band is shifted upward in the amplitude direction by the magnitude of the line attenuation power, and the absolute value of the transmission characteristic of the frequency band is obtained.
  • the method and device for acquiring channel transmission characteristics collect the pre-equalization coefficients of each frequency band by using a channel scanning method, and obtain the transmission characteristics of each frequency band according to the equalization coefficient, and then perform the transmission characteristic curves of the respective frequency bands.
  • the translation process is performed to obtain the transmission characteristic curve of the entire frequency band. Since the channel scanning method can be performed while the HFC network is in the working state, the network is not required to be powered off, and the acquired equalization coefficient is independent of the network noise, and can reflect the line.
  • the transmission characteristics therefore, compared to the prior art using instrument measurement methods, can improve the accuracy of the analysis results.
  • FIG. 1 is a schematic diagram of a typical HFC network
  • FIG. 2 is a flowchart of an embodiment of a method for acquiring a channel transmission characteristic according to the present invention
  • 3 is a schematic diagram of overlapping regions of two adjacent channels
  • CM channels 4 is a schematic diagram of transmission characteristics of a plurality of CM channels
  • Figure 5 is a transmission characteristic curve of the entire frequency band to be tested obtained by translation
  • FIG. 6 is a graph showing absolute values of channel transmission characteristics corresponding to the channel transmission characteristic curve shown in FIG. 5;
  • FIG. 7 is a schematic structural diagram of an embodiment of a channel transmission characteristic obtaining apparatus according to the present invention.
  • FIG. 8 is a schematic structural diagram of an embodiment of a server that can be used to obtain channel transmission characteristics according to the present invention.
  • FIG. 2 is a flowchart of an embodiment of a method for acquiring a channel transmission characteristic according to the present invention. As shown in FIG. 2, the method in this embodiment may be implemented by a server configured on a network side or a channel transmission characteristic acquiring device at another location of the HFC network.
  • the method of the example may include:
  • Step 201 Acquire, by means of channel scanning, a transmission characteristic curve of each of at least two channels in the CM, where the at least two channels form a continuous frequency band.
  • a characteristic curve reflects the amplitude of a channel at each frequency point.
  • the frequency characteristics of the frequency points corresponding to the transmission characteristic curves of the at least two channels are the same, and the magnitudes of the amplitude values are also the same, that is, the transmission characteristic curves of the at least two channels acquired in step 201 can be located in the same coordinate system, such that The frequency unit indicated by the abscissa of each transmission characteristic curve in the coordinate system is the same, and the amplitude unit indicated by the ordinate is also the same.
  • the frequency point at the most central position in a channel can be referred to as the center frequency point of the channel.
  • the center frequency of the channel of the CM can be set according to a certain rule, for example, the frequency point is set according to the increasing or decreasing of the equal difference to ensure coverage of the entire frequency band to be tested.
  • the last frequency of the previous channel should be guaranteed for any two adjacent channels.
  • the point coincides with the first frequency point of the latter channel.
  • the two channels may overlap with each other for a certain length, as shown in FIG. 3, and FIG. 3 is an overlapping area of two adjacent channels.
  • the bandwidth of each channel can be set to the maximum, that is, 6.4 MHz, and the center frequency of each channel can be 8.2 MHz, 11.4 MHz, 14.6, respectively. MHz, ..., 33.8MHz, 37MHz.
  • the setting of the above channel may be set in the network management device for controlling the CMTS, and the network management device determines the number of uplink channels, and the center frequency of each uplink channel is in the actual operation of the network.
  • the CM and CMTS transmit information according to these settings.
  • the usual channel setting satisfies the requirements of the channel in the embodiment of the present invention. Therefore, in the specific implementation, the existing channel and frequency point can be directly used.
  • the transmission characteristic curve can be acquired for the channel set above.
  • step 201 may directly collect the transmission characteristic curve of each channel; if the network does not support the in-band of the direct acquisition channel Frequency response, when step 201 may include: first acquiring pre-equalization coefficients of at least two channels in the CM by means of channel scanning; and obtaining each of the channels according to pre-equalization coefficients of the at least two channels respectively Transmission characteristic curve.
  • the corresponding in-band frequency response that is, the transmission characteristic curve
  • FIG. 4 is a schematic diagram of a transmission characteristic curve of a plurality of channels of a certain CM, and the transmission characteristic curves of a plurality of channels directly collected or obtained according to the pre-equalization coefficient are as shown in FIG. 4 .
  • Step 202 Translate the transmission characteristic curve of the channel along the amplitude direction, so that the amplitudes corresponding to the same frequency points of the respective transmission characteristic curves coincide to form a continuous curve.
  • step 202 may include:
  • the frequency bands in which adjacent channels overlap each other are a longer frequency band, that is, if there are multiple identical frequency points in the transmission characteristic curves of the at least two channels, the calculation is arbitrary.
  • the difference between the amplitudes of the same frequency points in the transmission characteristic curves of the two channels, and the difference is taken as the first distance MovedV, including the following substeps:
  • an optional translation mode is to sequentially shift the transmission characteristic curves of the two adjacent channels until all the curves are connected into a continuous curve.
  • the step 202 may include:
  • the above steps are performed by continuing to the transmission characteristic curve corresponding to the frequency band formed by the adjacent channel until the transmission characteristic curves corresponding to all the channels are connected into a continuous curve.
  • fixing a transmission characteristic curve of one of the two adjacent channels may include: fixing a transmission characteristic curve of a channel having a smaller frequency point among the two adjacent channels.
  • a channel having a smaller frequency point means that if a transmission characteristic curve corresponds to a minimum frequency value in a frequency point and is smaller than a minimum frequency value in another transmission characteristic curve, transmission of a frequency point having a smaller frequency
  • the channel corresponding to the characteristic curve is a channel with a smaller frequency point.
  • the number of channels is three, which are respectively referred to as a first channel, a second channel, and a third channel.
  • the first channel and the second channel are adjacent channels
  • the second channel and the third channel are adjacent channels, and calculates a first distance a first channel and a second channel, labeled MovedV 2, the first distance and the second channel and the third channel is marked MovedV 3.
  • the second channel transmission characteristic curve may be fixed, and the transmission characteristic curve of the third channel is translated in the amplitude direction by the MovedV 3 so that the amplitudes corresponding to the same frequency points of the transmission characteristic curves of the third channel and the second channel coincide.
  • a transmission characteristic curve corresponding to the frequency band formed by the second channel and the third channel is formed; then the transmission characteristic curve of the first channel is fixed, and the transmission characteristic curve corresponding to the frequency band formed by the second channel and the third channel is formed along Transmitting the MovedV 2 in the amplitude direction, so that the amplitudes corresponding to the same frequency points of the transmission characteristics of the second channel and the first channel are coincident, and the frequency bands formed by the first channel, the second channel, and the third channel are formed correspondingly.
  • the distances that the transmission characteristic curves of the respective channels need to be translated respectively may be separately calculated, and then each curve is translated by a second distance to obtain a transmission characteristic curve of the continuous frequency band to be tested.
  • the specific operations can be as follows:
  • step 202 may include:
  • the MovedPower i is a second distance corresponding to the transmission characteristic curve of the i th channel, where i is an integer greater than 1 and less than or equal to N;
  • the transmission characteristic curve of the first channel is fixed, and the transmission characteristic curves of the other channels are respectively translated in the amplitude direction by a second distance corresponding to the transmission characteristic curve of the channel, so that the transmission characteristic curves of the respective channels correspond to the same frequency point.
  • the amplitudes coincide to form a continuous curve.
  • step 202 The manner of step 202 will be described in detail below by taking the transmission characteristic curve of a plurality of CM channels shown in FIG. 4 as an example.
  • Step 202 needs to shift all the transmission characteristic curves with the respective center frequency points as the axis and the amplitude direction.
  • the target of the translation is to make the curves corresponding to the overlapping frequency bands coincide with each other, thereby obtaining a continuous curve.
  • the amount of translation of the next two channels relative to the previous curve is called the first distance, that is, MovedV
  • the calculation method of the first distance MovedV may be the two curves.
  • the values of the corresponding amplitudes of the overlapping portions of the frequency points are subtracted and the average value is obtained.
  • the specific process of translation can be controlled by the program. The specific steps can be as follows:
  • V k-1 [V k-1,1 , V k- 1,2 ,...,V k-1,m ]
  • V k [V k,1 , V k,2 ,...,V k,m ]
  • the overlap region is For the curve coincidence, the first distance MovedV k of the kth curve to be translated relative to the k-1th curve is:
  • the first distance of the second curve relative to the first curve is determined as MovedV 2
  • the first distance of the third curve relative to the second curve is MovedV 3
  • the set c of the first distance MovedV of all the front and back curves can be obtained as:
  • N is the number of channels.
  • the first distance MovedV of the other curves is gradually accumulated, that is, the relative translation amount of each curve is the first distance corresponding to the curve and the bars before the curve.
  • the sum of the first distances of the curves is used to obtain the final relative translation amount of each curve, that is, the second distance MovedPower, so that the curves are finally combined to obtain the transmission performance curve of the entire frequency band.
  • the second distance of each curve is MovedPower as follows:
  • the second set of distances for all curves is:
  • the translation of the step 202 can be completed, and the transmission characteristic curve of the frequency band to be tested is obtained.
  • the transmission characteristic curve of the latter channel needs to be moved, that is, only one first distance MovedV needs to be calculated, so there is no need to sum each first distance MovedV, therefore, only By fixing the transmission characteristic curve of the previous channel and shifting the transmission characteristic curve of the latter channel in the amplitude direction by the first distance MovedV, the overlapping frequency points of the transmission characteristic curves of the two channels may be partially overlapped.
  • Step 203 The continuous curve is used as a transmission characteristic curve of the continuous frequency band.
  • the continuous curve obtained after the translation according to step 202 is as shown in FIG. 5, and FIG. 5 is the transmission of the entire frequency band to be tested obtained by the translation. Characteristic curve.
  • the transmission characteristic curve of the frequency band to be tested obtained at this time is a relative value of the transmission characteristic, not an absolute value. That is to say, the relative position of each point on the curve can reflect the transmission characteristics of the channel, and the quality of the channel can be analyzed according to the shape of the curve, fault diagnosis and positioning, line adjustment, etc., but the amplitude is not the actual receiving level.
  • the following optional steps 204-206 need to be performed.
  • Step 204 (optional), collecting the transmit power and the received power corresponding to each of the channels.
  • step 203 is to collect the transmit power of the CM corresponding to each channel and the received power of the CMTS; for the downlink channel, step 203 is to collect the corresponding to each of the channels.
  • the transmit power of the CMTS and the CM receive power are to collect the corresponding to each of the channels.
  • Step 205 (optional), obtaining line attenuation power according to the transmit power and the received power corresponding to each channel.
  • Step 206 Optional: shifting the transmission characteristic curve of the frequency band in the amplitude direction by the magnitude of the line attenuation power to obtain an absolute value of the transmission characteristic of the frequency band.
  • the channel transmission characteristic curve shown in FIG. 5 is a curve of the absolute value of the channel transmission characteristic corresponding to the channel transmission characteristic curve shown in FIG. 5.
  • the transmission characteristic curve of each channel in the frequency band to be tested in the CM is obtained, and the transmission characteristic curve of the entire frequency band to be tested is obtained by shifting the curve, because the data acquisition process and the data processing process can be performed in the HFC.
  • the network When the network is in working state, it can obtain the transmission characteristic curve of the frequency band to be tested when the HFC network is in operation; and, because of the pre-equalization coefficient of the acquisition channel or the way of directly collecting the in-band frequency response data of the channel, instead of The method of measuring the signal by using an external instrument is not affected by the noise in the measurement of the instrument. Therefore, the method for obtaining the transmission characteristic curve by using the spectrum analyzer or the network analyzer in the prior art is obtained by the method of the embodiment of the present invention.
  • the transmission characteristic curve has higher accuracy.
  • FIG. 7 is a schematic structural diagram of an apparatus for acquiring a channel transmission characteristic according to the present invention.
  • the apparatus 700 of this embodiment may include an obtaining module 701 and a processing module 702, where
  • the obtaining module 701 can be configured to acquire, by means of channel scanning, a transmission characteristic curve of at least two channels in the cable modem; a characteristic curve reflects a channel at each frequency point.
  • the magnitude of the amplitude, the at least two channels form a continuous frequency band, and the transmission characteristic curves of the at least two channels respectively have the same frequency value of the frequency points, and the amplitude values are also of the same order of magnitude;
  • the processing module 702 can be configured to translate the transmission characteristic curve of the channel along the amplitude direction, so that the amplitudes corresponding to the same frequency points of the respective transmission characteristic curves coincide to form a continuous curve; and the continuous curve As a transmission characteristic curve for obtaining the continuous frequency band.
  • the device of this embodiment may be used to implement the technical solution of the embodiment of the method of FIG. 2 and the foregoing method, and the implementation principle thereof is similar.
  • the function of each function module may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to Related descriptions in the above embodiments are not described herein again.
  • the transmission characteristic curve of each channel in the frequency band to be tested in the CM is acquired by the acquisition module, and the transmission characteristic curve of the entire frequency band to be tested is obtained by the processing module by using the curve of the curve, because the process and data of the data collection process
  • the processing can be performed when the HFC network is in working state, so that the transmission characteristic curve of the frequency band to be tested can be obtained when the HFC network is in operation; and, due to the pre-equalization coefficient of the acquisition channel or the in-band frequency response of the direct acquisition channel
  • the manner of the data, rather than the way in which the signal is measured by an external instrument, is not affected by the noise in the instrument measurement, and thus the present invention is obtained by using a spectrum analyzer or a network analyzer in the prior art to obtain a transmission characteristic curve.
  • the transmission characteristic curve obtained in the examples has higher accuracy.
  • processing module 702 in the device in the foregoing embodiment may be specifically configured to:
  • the above steps are performed by continuing to the transmission characteristic curves corresponding to the frequency bands formed by adjacent channels until the transmission characteristic curves corresponding to all channels are connected into a continuous curve.
  • the processing module 702 can be specifically configured to:
  • the transmission characteristic curve of the channel having the smaller frequency point among the two adjacent channels is fixed, and the transmission characteristic curve of the other channel is translated.
  • processing module 702 in the apparatus of the foregoing embodiment may further be specifically configured to:
  • the processing module 702 in the device of the example may specifically be used to:
  • the MovedPower i is a second distance corresponding to the transmission characteristic curve of the ith channel, and i is an integer greater than 1 and less than N or equal to;
  • the transmission characteristic curve of the first channel is fixed, and the transmission characteristic curves of the other channels are respectively translated in the amplitude direction by a second distance corresponding to the transmission characteristic curve of the channel, so that the transmission characteristic curves of the respective channels correspond to the same frequency point.
  • the amplitudes coincide to form a continuous curve.
  • the processing module 702 is specifically configured to:
  • the acquiring module 701 may be specifically configured to:
  • a transmission characteristic curve of each of the channels is obtained according to pre-equalization coefficients of the at least two channels.
  • the transmission characteristic curve of the frequency band to be tested obtained at this time is a relative value of the transmission characteristic, not an absolute value. That is to say, the relative position of each point on the curve can reflect the transmission characteristics of the channel, and the quality of the channel can be analyzed according to the shape of the curve, fault diagnosis and positioning, line adjustment, etc., but the amplitude is not the actual receiving level.
  • the acquisition module 701 can also be used to:
  • the processing module 702 can also be used to:
  • the transmission characteristic curve of the frequency band is shifted upward in the amplitude direction by the magnitude of the line attenuation power, and the absolute value of the transmission characteristic of the frequency band is obtained.
  • FIG. 8 is a schematic structural diagram of an embodiment of a server that can be used to obtain channel transmission characteristics.
  • the server 800 includes an interface circuit 801 and a processor 802.
  • the memory 803 and the bus 804 are also shown.
  • the processor 802, the interface circuit 801, and the memory 803 are connected by a bus 804 and complete communication with each other.
  • the bus 804 can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus 804 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 8, but it does not mean that there is only one bus or one type of bus.
  • the memory 803 is for storing executable program code, the program code including computer operating instructions.
  • the memory 803 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • the processor 802 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • CPU Central Processing Unit
  • ASIC Application Specific Integrated Circuit
  • the interface circuit 801 is configured to acquire, by means of channel scanning, a transmission characteristic curve of at least two channels in the cable modem; a characteristic curve reflects a channel at each frequency point.
  • the magnitude of the amplitude, the at least two channels form a continuous frequency band, and the transmission characteristic curves of the at least two channels respectively have the same frequency value of the frequency points, and the magnitudes of the amplitude values are also the same;
  • the processor 802 is configured to translate the transmission characteristic curve of the channel along the amplitude direction, so that the amplitudes corresponding to the same frequency points of the respective transmission characteristic curves coincide to form a continuous curve; and the continuous curve is used as the frequency band. Transmission characteristic curve.
  • the processor 802 is specifically configured to:
  • the above steps are performed by continuing to the transmission characteristic curves corresponding to the frequency bands formed by adjacent channels until the transmission characteristic curves corresponding to all channels are connected into a continuous curve.
  • the processor 802 can be specifically configured to:
  • a transmission characteristic curve of a channel having a smaller frequency point among any two adjacent channels is fixed.
  • the number of channels is N, N is an integer greater than 1, the channel with the smallest frequency value of the center frequency point is the first channel, and the other channels are increasing according to the frequency value of the central frequency point. Sorting, the processor 802 is specifically configured to:
  • the MovedPower i is a second distance corresponding to the transmission characteristic curve of the ith channel, and i is an integer greater than 1 and less than N or equal to;
  • the transmission characteristic curve of the first channel is fixed, and the transmission characteristic curves of the other channels are respectively translated in the amplitude direction by the second distance corresponding to the transmission characteristic curve of the channel, so that the transmission characteristic curves of the two channels correspond to the same frequency point.
  • the magnitudes coincide to form a continuous curve.
  • the processor 802 is specifically configured to:
  • the interface circuit 801 is specifically configured to:
  • a transmission characteristic curve of each of the channels is obtained according to pre-equalization coefficients of the at least two channels.
  • the transmission characteristic curve of the frequency band to be tested obtained at this time is a relative value of the transmission characteristic, not an absolute value. That is to say, the relative position of each point on the curve can reflect the transmission characteristics of the channel, and the quality of the channel can be analyzed according to the shape of the curve, fault diagnosis and positioning, line adjustment, etc., but the amplitude is not the actual receiving level.
  • the interface circuit 801 can also be used to:
  • the processor 802 can also be used to:
  • the transmission characteristic curve of the frequency band is shifted upward in the amplitude direction by the magnitude of the line attenuation power, and the absolute value of the transmission characteristic of the frequency band is obtained.
  • the server of this embodiment may be used to implement the technical solution of the method embodiment of FIG. 2 and the foregoing method, and the implementation principle thereof is similar.
  • the function of each function module may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to Related descriptions in the above embodiments are not described herein again.
  • the transmission characteristic curve of each channel in the frequency band to be tested in the CM is obtained by the acquiring module, and the transmission characteristic curve of the entire frequency band to be tested is obtained by the processing module using the method of shifting the curve, due to the process and data of data collection.
  • the processing can be performed when the HFC network is in the working state, so that the transmission characteristic curve of the frequency band to be tested can be obtained when the HFC network is in the working state; and, due to the pre-equalization coefficient of the acquisition channel or the in-band of the direct acquisition channel
  • the way of frequency response data, instead of using external instruments to measure signals, is not affected by noise in the instrument measurement. Therefore, the transmission characteristic curve is obtained by using a spectrum analyzer or a network analyzer in the prior art.
  • the transmission characteristic curve obtained by the embodiment of the present invention has higher accuracy.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例提供一种信道传输特性获取方法和装置，其中，方法包括：通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线的相同频点对应的幅度重合，构成一条连续的曲线；将所述连续的曲线作为所述连续频段的传输特性曲线。本发明提供的信道传输特性获取方法和装置，能够实现在HFC网络处于工作状态时获取信道传输特性，并提高分析结果的准确性。

Description

信道传输特性获取方法和装置 技术领域
本发明涉及通信技术，尤其涉及一种信道传输特性获取方法和装置。
背景技术
混合光纤同轴电缆(Hybrid Fiber-Coaxial，简称：HFC)网络技术，是一种经济实用的综合数字服务宽带网接入技术。HFC通常由光纤干线、同轴电缆支线和用户配线网络三部分组成，从有线电视台出来的节目信号先变成光信号在干线上传输；到用户区域后把光信号转换成电信号，经分配器分配后通过同轴电缆送到用户。
图1为一个典型的HFC网络的示意图，如图1所示，HFC网络包括以下设备和器件：网络管理系统、主动网络维护(Proactive Network Maintenance，简称：PNM)服务器、同轴电缆局端接入设备(Cable Modem Terminal System，简称：CMTS)、光站、电缆调制解调器(Cable Modem，简称：CM)、用户侧的机顶盒(Set Top Box，简称：STB)和个人电脑(Personal Computer，简称：PC)和光缆(fiber)、同轴电缆(cable)、放大器、衰减器等器件(图中未将各个器件一一示出)。可以看出，CMTS位于城域网侧，也称为头端，CM位于用户端。
传输特性是指信号通过某个设备或信道，输入信号跟输出信号间的关系，是反映一个设备或信道传输质量和性能的参量。对于HFC网络来说，主要是指信号通过网络的衰减特性跟频率间关系曲线，这种关系也称为信号的幅频特性(幅度与频率的曲线图)。HFC网络中存在的每个设备、器件、电缆都是有自己的传输特性，加上网络结构的复杂性，使得各用户(CM)到头端(CMTS)的传输特性存在一定的差异性。
CM到头端的传输特性在HFC网络的设计和调试，以及将来的运维中都有很广泛的应用。HFC网络在初次设计调试时，为了保证各用户的路径损耗相近，要选用合适的器件以及最佳的级联方式进行安装布局，安装后还要对光设备及放大器进行调试，最终保持各用户的传输特性一致性；在 运维方面，随着网络使用时间的推移，各个器件的特性都是会发生不同程度的变化失真(原因有老化、进水腐蚀、电缆弯曲等)，最终使得各用户的传输特性曲线发生畸变，例如出现起伏或不平坦性，甚至有些用户出现较严重的故障问题，此时需要通过分析网络的传输特性，来分析故障的所在位置，进行线路调整。
对于如何获得CM到头端的传输特性，现有技术通常采用网络分析仪或频谱分析仪对网络信号进行测量和分析，但是这种方式需要在整个HFC网络处于下线状态才能进行，而无法在HFC处于工作状态时进行操作；并且，该方法要求网络不存在其它入侵信号，如噪声干扰等，如果存在时，入侵信号也会被仪器所测量，从而不能正确反映线路的特性，导致测量和分析的结果不准确。
发明内容
本发明实施例提供一种信道传输特性获取方法和装置，以实现在HFC网络处于工作状态时获取信道传输特性，并提高分析结果的准确性。
第一方面，本发明实施例提供一种信道传输特性获取方法，包括：
通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点的幅度大小，所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线的相同频点对应的幅度重合，构成一条连续的曲线；
将所述连续的曲线作为所述连续频段的传输特性曲线。
在第一方面的第一种可能的实现方式中，所述将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线，包括：
计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV；
将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相 邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
根据第一方面的第一种可能的实现方式，在第二种可能的实现方式中，将所述任意两个相邻信道中的一个信道的传输特性曲线固定，包括，将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。
根据第一方面的第一种或第二种可能的实现方式，在第三种可能的实现方式中，若所述两个相邻信道的传输特性曲线中存在多个相同的频点，则所述计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV，包括：
计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
根据第一方面的第一种至第三种可能的实现方式中的任意一种，在第四种可能的实现方式中，所述获取电缆调制解调器中至少两个信道的传输特性曲线，包括：
采集所述电缆调制解调器中至少两个信道的预均衡系数；
根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
根据第一方面的第一种至第四种可能的实现方式中的任意一种，在第五种可能的实现方式中，所述方法还包括：
采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
第二方面，本发明实施例提供一种信道传输特性获取装置，包括：
获取模块，用于通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点的幅度大小， 所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
处理模块，用于将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线的相同频点对应的幅度重合，构成一条连续的曲线；并将所述连续的曲线作为获得所述连续频段的传输特性曲线。
在第二方面的第一种可能的实现方式中，所述处理模块具体用于：
计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV；
将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
根据第二方面的第一种可能的实现方式，在第二种可能的实现方式中，所述处理模块具体用于：
将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。
根据第二方面的第一种或第二种可能的实现方式，在第三种可能的实现方式中，若所述至少两个相邻信道的传输特性曲线中存在多个相同的频点，则所述处理模块具体用于：
计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
根据第二方面的第一种至第三种可能的实现方式中的任意一种，在第四种可能的实现方式中，所述获取模块具体用于：
采集所述电缆调制解调器中至少两个信道的预均衡系数；
根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
根据第二方面的第一种至第四种可能的实现方式中的任意一种，在第五种可能的实现方式中，所述获取模块还用于：
采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
所述处理模块还用于：
根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
第三方面，本发明实施例提供一种服务器，包括：
接口电路，用于通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点的幅度大小，所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
处理器，用于将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线；并将所述连续的曲线作为获得所述连续频段的传输特性曲线。
在第三方面的第一种可能的实现方式中，所述处理器具体用于：
计算任意两个相邻信道的传输特性曲线中相同频点中至少一个频点对应的幅度的差值，将所述差值作为第一距离MovedV；
将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
根据第三方面的第一种可能的实现方式，在第二种可能的实现方式中，所述处理器具体用于：
将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。
根据第三方面的第一种或第二种可能的实现方式，在第三种可能的实现方式中，若所述至少两个相邻信道的传输特性曲线中存在多个相同的频点，则所述处理器具体用于：
计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
根据第三方面的第一种至第三种可能的实现方式中的任意一种，在第四种可能的实现方式中，所述接口电路具体用于：
采集所述电缆调制解调器中至少两个信道的预均衡系数；
根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
根据第三方面的第一种至第四种可能的实现方式中的任意一种，在第五种可能的实现方式中，所述接口电路还用于：
采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
所述处理器还用于：
根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
本发明实施例提供的信道传输特性获取方法和装置，通过信道扫描的方法采集各个频段的预均衡系数，并根据与均衡系数求得各频段的传输特性，再通过对各个频段的传输特性曲线进行平移处理，从而获得整个频段的传输特性曲线，由于信道扫描的方法可以在HFC网络处于工作状态时进行，而不需要将网络断电，并且采集得到的与均衡系数与网络噪声无关，能够反映线路的传输特性，因此相比于现有技术采用仪器测量的方法，能够提高分析结果的准确性。
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一简单地介绍，显而易见地，下面描述中的附图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为一个典型的HFC网络的示意图；
图2为本发明信道传输特性获取方法实施例的流程图；
图3为相邻两个信道重叠区域的示意图；
图4为某一CM多个信道的传输特性曲线示意图；
图5为平移获得的整个待测频段的传输特性曲线；
图6为图5所示的信道传输特性曲线对应的信道传输特性绝对值的曲线；
图7为本发明信道传输特性获取装置实施例的结构示意图；
图8为本发明提供的可用于获取信道传输特性的服务器实施例的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，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。
图2为本发明信道传输特性获取方法实施例的流程图，如图2所示，本实施例的方法可以由设置在网络侧的服务器或HFC网络其他位置的信道传输特性获取装置完成，本实施例的方法可以包括：
步骤201、通过信道扫描的方式获取CM中至少两个信道各自的传输特性曲线，所述至少两个信道组成一个连续频段。
其中，一条特征曲线反应的是一个信道在各频点的幅度大小。所述至少两个信道的传输特性曲线分别对应的频点的频率数量级相同，且幅度值数量级也相同，即，步骤201获取到的至少两个信道的传输特性曲线可以位于同一坐标系中，这样坐标系中每条传输特征曲线横坐标指示的频率单位相同，纵坐标指示的幅度单位也相同。
一个信道中位于最中心位置的频点可以称为该信道的中心频点。可以按照一定的规律设置CM的信道的中心频点，例如按照等差递增或递减的方式设置频点，以保证覆盖整个待测频段。并且，为了使最后得到的整个频段的传输特性曲线连续，对于任意两个相邻信道，应保证前一信道的最后一个频 点与后一信道的第一个频点重合，为了提高结果的准确性，还可以使前后两个信道存在一定长度的重叠，如图3所示，图3为相邻两个信道重叠区域的示意图。
具体实现时，对于频率范围为5～42MHz的上行频段，为了提高效率，可将每个信道的带宽设为最大，即6.4MHz，各信道的中心频点可分别为8.2MHz，11.4MHz，14.6MHz，…，33.8MHz，37MHz。
需要说明的是，以上信道的设置，可以是网络管理设备中对CMTS进行控制设置的，由网络管理设备确定上行信道的个数，每个上行信道的中心频点，在网络的实际运行中，CM和CMTS按这些设置进行信息传输。并且，通常的信道设置即满足本发明实施例对信道的要求，因此，在具体实现时，可以直接使用已有的信道和频点。
确定了信道以及频点之后，可以对以上设置的的信道采集传输特性曲线。
具体地，若网络支持直接采集信道的带内频响，即每个信道的传输特性曲线，则步骤201可以直接采集所述每个信道的传输特性曲线；若网络不支持直接采集信道的带内频响，则当步骤201可以包括：先通过信道扫描的方式采集所述CM中至少两个信道的预均衡系数；再根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。具体可以通过将采集到的预均衡系数进行傅里叶变换求得相应的带内频响，即传输特性曲线。图4为某一CM多个信道的传输特性曲线示意图，直接采集到的或根据预均衡系数求得的多个信道的传输特性曲线如图4所示。
步骤202、将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线。
对于一种特殊情形，相邻两个信道首尾相连，即相邻两个信道只有一个频点互相重合，则步骤202可以包括：
计算任意两个信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV；将其中一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向进行平移所述第一距离MovedV，使所述两个信道的传输特性曲线相同频点对应的幅度重合。
而对于更一般的情形，相邻信道互相重复的频段为一段较长的频段，即所述至少两个信道的传输特性曲线中存在多个相同的频点，则所述计算任意 两个信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV，包括以下子步骤：
先计算任意两个信道的传输特性曲线中各个相同频点对应的幅度的差值；再计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
对于步骤202，一种可选的平移方式为依次对相邻的两个信道的传输特性曲线进行平移，直到所有曲线连成一条连续的曲线，具体地，步骤202可以包括：
计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV；
将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
继续对该相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
具体实现时，将所述任意两个相邻信道中的一个信道的传输特性曲线固定，可以包括：将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。其中，具有较小频点的信道是指：如果一条传输特征曲线对应频点中的最小频率值，比另一条传输特征曲线中的最小频率值更小，那么具有更小频率的频点的传输特征曲线对应的信道就是具有较小频点的信道。
例如，信道个数为3个，分别称为第一信道，第二信道和第三信道，第一信道和第二信道为相邻信道，第二信道和第三信道为相邻信道，则可以分别计算第一信道和第二信道的第一距离，标记为MovedV2，以及第二信道和第三信道的第一距离标记为MovedV3。可以先将第二信道传输特性曲线固定，将第三信道的传输特性曲线沿幅度方向平移所述MovedV3，使所述第三信道和第二信道的传输特性曲线相同频点对应的幅度重合，这时将形成第二信道和第三信道所构成的频段对应的传输特性曲线；再将第一信道传输特性曲线固定，将第二信道和第三信道所构成的频段对应的的传输特性曲线沿幅度方向平移所述MovedV2，使所述第二信道和第一信道的传输特性曲线相同频点 对应的幅度重合，这时将形成第一信道、第二信道和第三信道所构成的频段对应的传输特性曲线。
可选地，还可以先分别计算出各个信道的传输特性曲线分别需要平移的距离(即第二距离)，然后将各个曲线平移各自的第二距离，以得到待测的连续频段的传输特性曲线。具体操作可以如下：
若所述信道的个数为N，N为大于1的整数，中心频点的频率值最小的信道为第一个信道，其他信道按中心频点递增的方向排序，其中，中心频点是指一个信道中位于最中间位置的频点，则步骤202可以包括：
计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV，第j个信道的传输特性曲线对应的第一距离为MovedVj，j为大于1且小于或等于N的整数；
根据以下公式计算第i个信道的传输特性曲线对应的第二距离：
Figure PCTCN2014087701-appb-000001
其中，MovedPoweri为第i个信道的传输特性曲线对应的第二距离，i为大于1且小于或等于N的整数；
将第一个信道的传输特性曲线固定，将其他信道的传输特性曲线沿幅度方向分别平移所述信道的传输特性曲线对应的第二距离，使所述各个信道的传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线。
下面以图4所示的某一CM多个信道的传输特性曲线为例，对步骤202的这种方式进行详细的描述。
步骤202需要将所有传输特性曲线以各自的中心频点为轴线，延幅度方向平移，平移的目标是使重叠的频段对应的曲线互相重合，从而获得一条连续的曲线。
平移过程中，相邻两个信道的传输特性曲线中，后一条曲线相对前一条曲线要平移的量称为第一距离，即MovedV，该第一距离MovedV的计算方法可以是就是这两条曲线的频点重叠部分的所对应的幅度的数值相减再求其平均值。平移的具体过程可以由程序控制，具体步骤可以如下：
假设中心频点最小的信道为第一个信道，其他信道按中心频点递增的方向排序，第k-1条曲线和第k条曲线的重叠区域的频点为f＝[fk,1、fk,2、…、fk,m] 共m个频点，这些频点对应于第k-1条曲线中的幅度值为Vk-1＝[Vk-1,1、Vk-1,2、…、Vk-1,m]，对应于第k条曲线的幅度值为Vk＝[Vk,1、Vk,2、…、Vk,m]，则重叠区域要进行曲线重合，则第k条曲线相对于第k-1条曲线要进行平移的第一距离MovedVk为：
Figure PCTCN2014087701-appb-000002
根据公式(1)，可分别求出第二条曲线相对于第一条曲线的第一距离为MovedV2，第三条曲线相对于第二条曲线的第一距离为MovedV3，依此类推，可求得所有前后两曲线的第一距离MovedV的集合c为：
c＝[MovedV2，MovedV3，Λ，MovedVN]       (2)
其中，N为信道的数目。
然后，以第一条曲线为参考，即不发生平移，对其他曲线的第一距离MovedV进行逐步累加，即每条曲线的相对平移量为该曲线对应的第一距离以及该曲线之前的各条曲线的第一距离之和，求得各条曲线最终的相对平移量，即第二距离MovedPower，使得各曲线最终联合在一起，从而获得整个频段的传输性能曲线。各条曲线第二距离MovedPower如下：
设第i条曲线的第二距离MovedPower为MovedPoweri，其计算方法为如下的公式(3)：
MovedPoweri＝MovedV2+MovedV3+Λ+MovedVi         (3)
所有曲线的第二距离集合为：
MovedPower＝[0,MovedPower2,Λ,MovedPoweri,Λ,MovedPowern]       (4)
根据公式(4)即可以完成步骤202的平移，获得待测频段的传输特性曲线。
对于待测的信道数为两个的情况，则只需要移动后一个信道的传输特性曲线，即只需要计算一个第一距离MovedV，因此无需再对各个第一距离MovedV求和，因此，只需将前一信道的传输特性曲线固定，将后一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，就可以使所述两个信道的传输特性曲线的重叠频点部分重合。
步骤203、将所述连续的曲线作为所述连续频段的传输特性曲线。
同样以图4所示的CM多个信道的传输特性曲线为例，按照步骤202平移后的得到的连续曲线如图5所示，图5为平移获得的整个待测频段的传输 特性曲线。
需要说明的是，此时获得的待测频段的传输特性曲线为传输特性的相对值，而不是绝对值。也就是说，曲线上各个的点相对位置能够反映信道的传输特性，可以根据曲线的形状分析信道的质量、进行故障诊断和定位、线路调整等，但其幅度并不是实际的接收电平。若要获得待测频段的传输特性的绝对值，则需要执行以下的可选步骤204～206。
步骤204(可选)、采集每个所述信道对应的发射功率和接收功率。
对于上行信道而言，则步骤203为采集每个所述信道对应的所述CM的发射功率和CMTS的接收功率；对于下行信道而言，则步骤203为采集每个所述信道对应的所述CMTS的发射功率和的CM接收功率。
步骤205(可选)、根据所述每个信道对应的发射功率和接收功率获得线路衰减功率。
步骤206(可选)、将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
以如图5所示的信道传输特性曲线为例进行说明，若计算得到线路衰减功率为44dB，则可以将图5所示的信道传输特性曲线向上平移44dB，获得图6所示的曲线，图6为图5所示的信道传输特性曲线对应的信道传输特性绝对值的曲线。
本发明实施例，通过获取CM中待测频段内各个信道的传输特性曲线，通过对曲线进行平移的方式获得整个待测频段的传输特性曲线，由于数据采集的过程和数据处理过程均可以在HFC网络处于工作状态时进行，因此能够在HFC网络处于工作状态时获得待测频段的传输特性曲线；并且，由于通过采集信道的预均衡系数或直接采集信道的带内频响数据的方式，而不是采用外部仪器测量信号的方式，不会受到仪器测量中的噪声影响，因此，相比于现有技术中采用频谱分析仪或网络分析仪的方式获取传输特性曲线，本发明实施例的方法所获得的传输特性曲线具有更高的准确性。
图7为本发明信道传输特性获取装置实施例的结构示意图，如图7所示，本实施例的装置700可以包括获取模块701和处理模块702，其中，
所述获取模块701，可以用于通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点 的幅度大小，所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
所述处理模块702，可以用于将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线的相同频点对应的幅度重合，构成一条连续的曲线；并将所述连续的曲线作为获得所述连续频段的传输特性曲线。
本实施例的装置，可以用于执行图2以及上述方法实施例的技术方案，其实现原理类似，其各个功能模块的功能可以根据上述方法实施例中的方法具体实现，其具体实现过程可参照上述实施例中的相关描述，此处不再赘述。
本实施例的装置，通过获取模块获取CM中待测频段内各个信道的传输特性曲线，通过处理模块采用对曲线进行平移的方式获得整个待测频段的传输特性曲线，由于数据采集的过程和数据处理过程均可以在HFC网络处于工作状态时进行，因此能够在HFC网络处于工作状态时获得待测频段的传输特性曲线；并且，由于通过采集信道的预均衡系数或直接采集信道的带内频响数据的方式，而不是采用外部仪器测量信号的方式，不会受到仪器测量中的噪声影响，因此，相比于现有技术中采用频谱分析仪或网络分析仪的方式获取传输特性曲线，本发明实施例所获得的传输特性曲线具有更高的准确性。
可选地，上述实施例的装置中所述处理模块702具体可以用于：
计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV；
将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
其中，为了便于实现，所述处理模块702具体可以用于：
将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定，平移另一个信道的传输特性曲线。
进一步地，上述实施例的装置中所述处理模块702还可以具体用于：
计算任意两个相邻信道的传输特性曲线中相同频点中至少一个频点对应的幅度的差值，将所述差值作为第一距离MovedV；
将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个信道的传输特性曲线相同频点对应的幅度重合；
重复执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
可选地，若所述信道的个数为N，N为大于1的整数，中心频点最小的信道为第一个信道，其他信道按中心频点的频率值递增的方向排序，则上述实施例的装置中所述处理模块702具体可以用于：
计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV，第j个信道的传输特性曲线对应的第一距离为MovedVj，j为大于1且小于或等于N的整数；
根据以下公式计算第i个信道的传输特性曲线对应的第二距离：
Figure PCTCN2014087701-appb-000003
其中，MovedPoweri为第i个信道的传输特性曲线对应的第二距离，i为大于1且小于N或等于的整数；
将第一个信道的传输特性曲线固定，将其他信道的传输特性曲线沿幅度方向分别平移所述信道的传输特性曲线对应的第二距离，使所述各个信道的传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线。
进一步地，若所述至少两个信道的传输特性曲线中存在多个相同的频点，则所述处理模块702具体用于：
计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
进一步地，如果网络不支持直接采集信道的带内频响，则所述获取模块701具体可以用于：
采集所述电缆调制解调器中至少两个信道的预均衡系数；
根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
需要说明的是，此时获得的待测频段的传输特性曲线为传输特性的相对值，而不是绝对值。也就是说，曲线上各个的点相对位置能够反映信道的传输特性，可以根据曲线的形状分析信道的质量、进行故障诊断和定位、线路调整等，但其幅度并不是实际的接收电平。若要获得待测频段的传输特性的绝对值，则可选地，所述获取模块701还可以用于：
采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
所述处理模块702还可以用于：
根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
图8为本发明提供的可用于获取信道传输特性的服务器实施例的结构示意图，如图8所示，该服务器800包括接口电路801和处理器802，图中还示出了存储器803和总线804，该处理器802、接口电路801和存储器803通过总线804连接并完成相互间的通信。
该总线804可以是工业标准体系结构(Industry Standard Architecture，ISA)总线、外部设备互连(Peripheral Component，PCI)总线或扩展工业标准体系结构(Extended Industry Standard Architecture，EISA)总线等。该总线804可以分为地址总线、数据总线、控制总线等。为便于表示，图8中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
存储器803用于存储可执行程序代码，该程序代码包括计算机操作指令。存储器803可能包含高速RAM存储器，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。
处理器802可以是一个中央处理器(Central Processing Unit，CPU)，或者是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路。
其中，接口电路801，用于通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点的 幅度大小，所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
处理器802，用于将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线；并将所述连续的曲线作为所述频段的传输特性曲线。
可选地，所述处理器802具体用于：
计算任意两个相邻信道的传输特性曲线中相同频点中至少一个频点对应的幅度的差值，将所述差值作为第一距离MovedV；
将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
其中，为了便于实现，所述处理器802具体可以用于：
将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。
在一个可选的实施例中，信道的个数为N，N为大于1的整数，中心频点的频率值最小的信道为第一个信道，其他信道按中心频点的频率值递增的方向排序，则所述处理器802具体用于：
计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV，第j个信道的传输特性曲线对应的第一距离为MovedVj，j为大于1且小于N或等于的整数；
根据以下公式计算第i个信道的传输特性曲线对应的第二距离：
Figure PCTCN2014087701-appb-000004
其中，MovedPoweri为第i个信道的传输特性曲线对应的第二距离，i为大于1且小于N或等于的整数；
将第一个信道的传输特性曲线固定，将其他信道的传输特性曲线沿幅度方向分别平移所述信道的传输特性曲线对应的第二距离，使所述两个信道的传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线。
具体实现时，若所述至少两个信道的传输特性曲线中存在多个相同的频点，则所述处理器802具体用于：
计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
可选地，若网络不支持直接采集信道的传输特性曲线，所述接口电路801具体用于：
采集所述电缆调制解调器中至少两个信道的预均衡系数；
根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
需要说明的是，此时获得的待测频段的传输特性曲线为传输特性的相对值，而不是绝对值。也就是说，曲线上各个的点相对位置能够反映信道的传输特性，可以根据曲线的形状分析信道的质量、进行故障诊断和定位、线路调整等，但其幅度并不是实际的接收电平。若要获得待测频段的传输特性的绝对值，则可选地，所述接口电路801还可以用于：
采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
所述处理器802还可以用于：
根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
本实施例的服务器，可以用于执行图2以及上述方法实施例的技术方案，其实现原理类似，其各个功能模块的功能可以根据上述方法实施例中的方法具体实现，其具体实现过程可参照上述实施例中的相关描述，此处不再赘述。
本实施例的服务器，通过获取模块获取CM中待测频段内各个信道的传输特性曲线，通过处理模块采用对曲线进行平移的方式获得整个待测频段的传输特性曲线，由于数据采集的过程和数据处理过程均可以在HFC网络处于工作状态时进行，因此能够在HFC网络处于工作状态时获得待测频段的传输特性曲线；并且，由于通过采集信道的预均衡系数或直接采集信道的带内 频响数据的方式，而不是采用外部仪器测量信号的方式，不会受到仪器测量中的噪声影响，因此，相比于现有技术中采用频谱分析仪或网络分析仪的方式获取传输特性曲线，本发明实施例所获得的传输特性曲线具有更高的准确性。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (18)

  1. 一种信道传输特性获取方法，其特征在于，包括：
    通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点的幅度大小，所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
    将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线的相同频点对应的幅度重合，构成一条连续的曲线；
    将所述连续的曲线作为所述连续频段的传输特性曲线。
  2. 根据权利要求1所述的方法，其特征在于，所述将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线，包括：
    计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV；
    将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
    继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
  3. 根据权利要求2所述的方法，其特征在于，将所述任意两个相邻信道中的一个信道的传输特性曲线固定，包括，将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。
  4. 根据权利要求2或3所述的方法，其特征在于，若所述两个相邻信道的传输特性曲线中存在多个相同的频点，则所述计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV，包括：
    计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
    计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
  5. 根据权利要求1～4中任一项所述的方法，其特征在于，所述获取电缆调制解调器中至少两个信道的传输特性曲线，包括：
    采集所述电缆调制解调器中至少两个信道的预均衡系数；
    根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
  6. 根据权利要求1～5中任一项所述的方法，其特征在于，所述方法还包括：
    采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
    根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
    将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
  7. 一种信道传输特性获取装置，其特征在于，包括：
    获取模块，用于通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点的幅度大小，所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
    处理模块，用于将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线的相同频点对应的幅度重合，构成一条连续的曲线；并将所述连续的曲线作为获得所述连续频段的传输特性曲线。
  8. 根据权利要求7所述的装置，其特征在于，所述处理模块具体用于：
    计算任意两个相邻信道的传输特性曲线中相同频点对应的幅度的差值，将所述差值作为第一距离MovedV；
    将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
    继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
  9. 根据权利要求8所述的装置，其特征在于，所述处理模块具体用于：
    将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。
  10. 根据权利要求8或9所述的装置，其特征在于，若所述至少两个相邻信道的传输特性曲线中存在多个相同的频点，则所述处理模块具体用于：
    计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
    计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
  11. 根据权利要求7～10中任一项所述的装置，其特征在于，所述获取模块具体用于：
    采集所述电缆调制解调器中至少两个信道的预均衡系数；
    根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
  12. 根据权利要求7～11中任一项所述的装置，其特征在于，所述获取模块还用于：
    采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
    所述处理模块还用于：
    根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
    将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
  13. 一种服务器，其特征在于，包括：
    接口电路，用于通过信道扫描的方式获取电缆调制解调器中至少两个信道的传输特性曲线；一条特征曲线反应的是一个信道在各频点的幅度大小，所述至少两个信道组成一个连续频段，所述至少两个信道的传输特性曲线分别对应的频点的频率值数量级相同，且幅度值数量级也相同；
    处理器，用于将所述信道的传输特性曲线沿幅度方向进行平移，使各个传输特性曲线相同频点对应的幅度重合，构成一条连续的曲线；并将所述连续的曲线作为获得所述连续频段的传输特性曲线。
  14. 根据权利要求13所述的服务器，其特征在于，所述处理器具体用于：
    计算任意两个相邻信道的传输特性曲线中相同频点中至少一个频点对应的幅度的差值，将所述差值作为第一距离MovedV；
    将所述任意两个相邻信道中的一个信道的传输特性曲线固定，将另一个信道的传输特性曲线沿幅度方向平移所述第一距离MovedV，使所述两个相邻信道的传输特性曲线相同频点对应的幅度重合，形成所述两个相邻信道构成的频段所对应的传输特性曲线；
    继续对相邻信道构成的频段所对应的传输特性曲线执行上述步骤，直到所有信道对应的传输特性曲线连成一条连续的曲线。
  15. 根据权利要求14所述的服务器，其特征在于，所述处理器具体用于：
    将所述任意两个相邻信道中具有较小频点的信道的传输特性曲线固定。
  16. 根据权利要求14或15所述的服务器，其特征在于，若所述至少两个相邻信道的传输特性曲线中存在多个相同的频点，则所述处理器具体用于：
    计算所述相邻信道的传输特性曲线中各个相同频点对应的幅度的差值；
    计算所述各个相同频点对应的幅度的差值的平均值，将所述平均值作为第一距离MovedV。
  17. 根据权利要求13～16中任一项所述的服务器，其特征在于，所述接口电路具体用于：
    采集所述电缆调制解调器中至少两个信道的预均衡系数；
    根据所述至少两个信道的预均衡系数分别获得每个所述信道的传输特性曲线。
  18. 根据权利要求13～17中任一项所述的服务器，其特征在于，所述接口电路还用于：
    采集每个所述信道对应的所述电缆调制解调器的发射功率和同轴电缆局端接入设备的接收功率；
    所述处理器还用于：
    根据所述每个信道对应的发射功率和接收功率获得线路衰减功率；
    将所述频段的传输特性曲线沿幅度方向上移所述线路衰减功率的大小，获得所述频段的传输特性的绝对值。
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