CN103516394B - The acquisition methods of the precompensation coefficient of cable and device - Google Patents
The acquisition methods of the precompensation coefficient of cable and device Download PDFInfo
- Publication number
- CN103516394B CN103516394B CN201210208062.2A CN201210208062A CN103516394B CN 103516394 B CN103516394 B CN 103516394B CN 201210208062 A CN201210208062 A CN 201210208062A CN 103516394 B CN103516394 B CN 103516394B
- Authority
- CN
- China
- Prior art keywords
- frequency
- cable
- frequency point
- normalized
- attenuation value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses acquisition methods and the device of the precompensation coefficient of a kind of cable, wherein, the method includes: obtain cable amplitude attenuation value of multiple Frequency points in predetermined band under given carrier frequency, wherein, the corresponding amplitude attenuation value of each Frequency point of multiple Frequency points；The precompensation coefficient of cable it is worth to according to multiple Frequency points and amplitude fading.The present invention solves the accuracy of the parameter estimation realizing the acquisition of precompensation coefficient in prior art by the way of feedback circuit and cause and is difficult to guaranteed technical problem, has reached the technique effect of the accuracy improving precompensation coefficient.
Description
Technical field
The present invention relates to the communications field, in particular to the acquisition methods of precompensation coefficient and the device of a kind of cable.
Background technology
Along with the development of communication technology, microwave communication, as one of the Primary communication means of communication technology, is increasingly subject to
The attention of people.Microwave communication by its can with Fast Installation, easily propagate through complicated landform, natural disaster after the fastest quick-recovery
Communication and there is the advantage such as protective capability of multimedium mixed transport be widely used.
In microwave telecommunication system, at transmitting terminal indoor unit (In Door Unit, referred to as IDU) and outdoor unit
An immediate frequency cable is needed to link between (Out Door Unit is referred to as OUD), but, due to current microwave communication system
In system, the main signal used has narrow band signal and broadband signal, when the analog intermediate frequency signal of certain signal bandwidth is by this electricity
During cable, the signal attenuation on different frequency point in signal bandwidth can be caused, thus affect the quality of the signal of transmitting terminal transmission, and
Affecting the performance of receiver, the impact above-mentioned when big bandwidth signal is especially apparent.In prior art, it is usually and uses simulation anti-
The mode being fed back to road carries out the elimination of signal attenuation and the estimation of precompensation coefficient, but, can caused again at feedback circuit
Fixed interference, thus have impact on the accuracy of parameter estimation.
For above-mentioned problem, effective solution is the most not yet proposed.
Summary of the invention
The invention provides acquisition methods and the device of the precompensation coefficient of a kind of cable, at least to solve in prior art
The accuracy of the parameter estimation realizing the acquisition of precompensation coefficient by the way of feedback circuit and cause is difficult to guaranteed
Technical problem.
According to an aspect of the invention, it is provided the acquisition methods of the precompensation coefficient of a kind of cable, including: obtain electricity
Cable amplitude attenuation value of multiple Frequency points in predetermined band under given carrier frequency, wherein, the plurality of Frequency point every
One corresponding amplitude attenuation value of Frequency point；It is worth to described cable according to the plurality of Frequency point and described amplitude fading
Precompensation coefficient.
Preferably, cable amplitude attenuation value of multiple Frequency points in predetermined band under given carrier frequency, bag are obtained
Include: test by the actual signal of described cable, obtain the amplitude attenuation value under the plurality of Frequency point；Or obtain
Corresponding relation between preset frequency and the amplitude attenuation value of described cable, determines the plurality of frequency according to described corresponding relation
Amplitude attenuation value under Dian.
Preferably, it is worth to the precompensation coefficient of described cable according to the plurality of Frequency point and described amplitude fading,
Including: obtain the filter corresponding with the cable properties of described cable according to the plurality of Frequency point and described amplitude attenuation value's matching
Ripple device；By ideal signal by described wave filter, obtain corresponding to institute carrying out sampling by the ideal signal of described wave filter
State the deamplification of cable；The precompensation system obtaining described cable is compared according to described deamplification and described ideal signal
Number.
Preferably, the cable with described cable is obtained according to the plurality of Frequency point and described amplitude attenuation value's matching special
Property corresponding wave filter, including: to the plurality of Frequency point and the amplitude of each Frequency point corresponding to the plurality of Frequency point
Pad value is normalized；Obtain and the cable properties pair of described cable according to the result matching obtained after normalized
The wave filter answered.
Preferably, the amplitude attenuation value of each Frequency point corresponding to the plurality of Frequency point is normalized,
Including: determine this frequency according to the amplitude attenuation value corresponding to the previous Frequency point of each Frequency point and predetermined constant value
The normalization amplitude attenuation value of the corresponding amplitude attenuation value of point.
Preferably, the plurality of Frequency point is normalized, including: each described Frequency point is except in sample frequency
Obtain the normalized frequency of described each described carrier frequency.
Preferably, it is normalized the amplitude attenuation value to the plurality of Frequency point with corresponding to each described Frequency point
After process, said method also includes: according to the maximum normalized frequency obtained after normalized and minimum normalization
Frequency, chooses one or more normalized frequency between 0 to 1, and is that these one or more normalized frequencies select normalization
Amplitude attenuation value.
Preferably, at each described Frequency point except the normalized frequency obtaining described each described Frequency point in sample frequency
Afterwards, said method also includes: the minimum that will obtain after the normalized frequency of described each described Frequency point and normalized
Normalized frequency subtract each other；The result obtained after subtracting each other is as normalized frequency, and wherein, this normalized frequency obtains for matching
To the wave filter corresponding with described cable properties.
According to a further aspect in the invention, it is provided that the acquisition device of the precompensation coefficient of a kind of cable, including: obtain single
Unit, for obtaining cable amplitude attenuation value of multiple Frequency points in predetermined band under given carrier frequency, wherein, described many
The corresponding amplitude attenuation value of each Frequency point of individual Frequency point；Signal generating unit, for according to the plurality of Frequency point and
Described amplitude fading is worth to the precompensation coefficient of described cable.
Preferably, described signal generating unit includes: fitting module, for declining according to the plurality of Frequency point and described amplitude
Depreciation matching obtains the wave filter corresponding with the cable properties of described cable；Sampling module, for passing through described by ideal signal
Wave filter, to the deamplification obtained corresponding to described cable of being sampled by the ideal signal of described wave filter；Generate mould
Block, for comparing the precompensation coefficient obtaining described cable according to described deamplification and described ideal signal.
In the present invention, cable is determined in different frequencies corresponding different amplitude attenuation value according to cable
Precompensation coefficient, solves the parameter realizing the acquisition of precompensation coefficient in prior art by the way of feedback circuit and cause
The accuracy estimated is difficult to guaranteed technical problem, has reached the technique effect of the accuracy improving precompensation coefficient, real
Show the simple purpose accurately estimating cable precompensation coefficient.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is a kind of preferred flow charts of the acquisition methods of the precompensation coefficient of cable according to embodiments of the present invention；
Fig. 2 is the another kind of preferred flow charts of the acquisition methods of the precompensation coefficient of cable according to embodiments of the present invention；
Fig. 3 is a kind of preferred structure block diagram of the acquisition device of the precompensation coefficient of cable according to embodiments of the present invention；
Fig. 4 is the another kind of preferred structure frame of the acquisition device of the precompensation coefficient of cable according to embodiments of the present invention
Figure；
Fig. 5 is another preferred flow charts of the acquisition methods of the precompensation coefficient of cable according to embodiments of the present invention；
Fig. 6 is the structure chart obtaining immediate frequency cable precompensation coefficient according to embodiments of the present invention；
Fig. 7 is the calculation flow chart obtaining immediate frequency cable precompensation coefficient according to embodiments of the present invention.
Fig. 8 is the waveform diagram of cable properties curve according to embodiments of the present invention.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.It should be noted that the preferred embodiment
It is intended merely to preferably describe the present invention, is not intended that and the present invention is limited improperly.
Present embodiments provide the acquisition methods of the precompensation coefficient of a kind of cable, as it is shown in figure 1, comprise the following steps:
Step S102: obtain cable amplitude attenuation value of multiple Frequency points in predetermined band under given carrier frequency,
Wherein, the corresponding amplitude attenuation value of each Frequency point of multiple Frequency points；
Step S104: be worth to the precompensation coefficient of cable according to Frequency points multiple in predetermined band and amplitude fading.
In above-mentioned preferred implementation, according to cable at different Frequency points corresponding different amplitude attenuation value
Determine the precompensation coefficient of cable, solve the acquisition realizing precompensation coefficient in prior art by the way of feedback circuit
And the accuracy of the parameter estimation caused is difficult to guaranteed technical problem, reach the accuracy of raising precompensation coefficient
Technique effect, it is achieved that the simple purpose accurately estimating cable precompensation coefficient.
For the amplitude attenuation value that above-mentioned Frequency point and Frequency point are corresponding, can obtain according to following two mode:
1) test by the actual signal of cable, the amplitude fading under multiple Frequency points in obtaining predetermined band
Value；That is, test actual cable obtains cable attenuation characteristic in cable carrier frequency f and actual signal bandwidth B；
2) obtain the corresponding relation between preset frequency and the amplitude attenuation value of cable, determine predetermined frequency according to corresponding relation
Amplitude attenuation value under multiple Frequency points in section.For example, it is possible to generate signal at carrier wave by the cable properties in cable handbook
Cable attenuation characteristic in frequency f and actual signal bandwidth B.
After the amplitude attenuation value of the frequency and correspondence thereof that get cable, cable can be obtained as follows
Attenuation quotient, as in figure 2 it is shown, comprise the following steps:
Step S202: obtain the cable with cable according to Frequency points multiple in predetermined band and amplitude attenuation value's matching special
The wave filter that property is corresponding；
Step S204: by ideal signal by wave filter, obtain correspondence to carrying out sampling by the ideal signal of wave filter
Deamplification in cable；
Step S206: compare the precompensation coefficient obtaining cable according to deamplification and ideal signal.
I.e., first according to the Frequency point obtained obtain with amplitude attenuation value's matching one corresponding with the cable properties of this cable
Wave filter, just can test out the signal attenuation of generation, so that it is determined that this cable is pre-by ideal signal by this wave filter
Penalty coefficient.By this purpose achieving the quick and precisely precompensation coefficient of cable.
In above-mentioned steps S202, obtain and cable according to Frequency points multiple in predetermined band and amplitude attenuation value's matching
Wave filter corresponding to cable properties time, first the amplitude fading of the Frequency point obtained and its correspondence can be normalized place
Reason, in a preferred embodiment, can realize in such a way: to multiple Frequency points with corresponding to multiple Frequency points
The amplitude attenuation value of each Frequency point is normalized；Result matching according to obtaining after normalized obtains and cable
Wave filter corresponding to cable properties.
Such as, when the amplitude attenuation value of each Frequency point corresponding to multiple Frequency points is normalized, can
To determine this frequency according to according to the amplitude attenuation value corresponding to the previous Frequency point of each Frequency point and predetermined constant value
The mode of the normalization amplitude attenuation value of the corresponding amplitude attenuation value of rate point realizes；Multiple Frequency points are being normalized
During process, can realize except the mode of the normalized frequency obtaining each Frequency point in sample frequency according to each Frequency point.
In view of after normalized, the frequency obtained can not cover this scope of 0-1, therefore can be according to acquisition
Maximum normalized frequency and the minimum several point of normalized frequency re-sampling, so that frequency can cover this scope of 0-1, and
Normalization amplitude attenuation value is determined the most again for the frequency of choosing after this.In a preferred embodiment, to multiple
After carrier frequency and the amplitude attenuation value corresponding to each carrier frequency are normalized, said method also includes: root
According to the maximum normalization carrier frequency obtained after normalized and minimum normalized frequency, between 0 to 1, choose one
Or multiple normalization carrier frequency, and it is that these one or more normalized frequencies select normalization amplitude attenuation value.
In order to reach simpler matching when, it may be considered that minimum Frequency point is returned 0 process, so in reality
Existing matching is more convenient when of design, in a preferred embodiment, at each Frequency point except obtaining often in sample frequency
After the normalized frequency of individual carrier frequency, said method also includes: at the normalized frequency of each Frequency point and normalization
The minimum normalized frequency obtained after reason is subtracted each other；The result obtained after subtracting each other is as normalized frequency, wherein, and this normalization
Frequency obtains the wave filter corresponding with cable properties for matching.
Additionally providing the acquisition device of the precompensation coefficient of a kind of cable in the present embodiment, this device is used for realizing above-mentioned
Embodiment and preferred implementation, carried out repeating no more of explanation.As used below, term " unit " " module "
The software of predetermined function and/or the combination of hardware can be realized.Although the device described by following example is preferably with software
Realize, but hardware, or the realization of the combination of software and hardware also may and be contemplated.Fig. 3 is the pre-benefit of cable
Repay a kind of preferred structure block diagram of the acquisition device of coefficient, as it is shown on figure 3, include: acquiring unit 302 and signal generating unit 304, under
In the face of this structure illustrates.
Acquiring unit 302, for obtaining cable amplitude of multiple Frequency points in predetermined band under given carrier frequency
Pad value, wherein, the corresponding amplitude attenuation value of each Frequency point of multiple Frequency points；
Signal generating unit 304, couples with acquiring unit 302, for being worth to electricity according to multiple Frequency points and amplitude fading
The precompensation coefficient of cable.
In a preferred embodiment, as shown in Figure 4, signal generating unit 304 includes: fitting module 402, for according to many
Individual Frequency point and amplitude attenuation value's matching obtain the wave filter corresponding with the cable properties of cable；Sampling module 404, with matching
Module 402 couples, for by ideal signal by wave filter, to by the ideal signal of wave filter carry out sampling obtain corresponding to
The deamplification of cable；Generation module 406, couples with sampling module 404, for comparing according to deamplification and ideal signal
Relatively obtain the precompensation coefficient of cable.
In order to be more fully understood that the present invention, realize entering one below in conjunction with specific embodiment and concrete algorithm
Step explanation.
As a example by immediate frequency cable, one of problem to be solved by this invention is that in microwave system, intermediate frequency analog band limited signal leads to
The problem decayed on different frequency bands when crossing the cable between indoor unit (IDU) and outdoor unit (OUD), accordingly, it would be desirable to carry
Go out the mode of a kind of penalty coefficient that can estimate signal attenuation exactly, in order to signal is pre-compensated at numeric field,
Thus immediate frequency cable impact on analog if signal is reduced or eliminated.
Detailed process is as follows:
Actual cable is tested, obtains immediate frequency cable declining in cable carrier frequency f and actual signal bandwidth B
Subtract performance plot, or generate signal electricity in carrier frequency f and actual signal bandwidth B according to the cable properties in cable handbook
Cable attenuation characteristic figure.Method according to above-mentioned cable attenuation characteristic figure is as it is shown in figure 5, comprise the following steps:
Step S502: according to cable attenuation characteristic curve chart, and predetermined algorithm designs one group of wave filter and carries out signal band
The matching of the cable properties in width.Specifically include following steps:
Step S1: obtain the amplitude fading in carrier frequency f and signal bandwidth B according to cable attenuation characteristic figure.
The carrier frequency assuming the intermediate-freuqncy signal by cable is fC, wherein,Sample frequency is fS, wherein, fS>
2fC.At frequency range [fC-B/2 fC+ B/2] in choose n frequency: f1,f2,…,fn, wherein, f1=fC-B/2、fn=fC+B/2.From electricity
Cable attenuation characteristic curve figure reads frequency: f1,f2,…,fnCorresponding amplitude attenuation value: α1,α2,…,αn。
Step S2: to frequency f1,f2,…,fnWith amplitude attenuation value α1,α2,…,αnIt is normalized.
N frequency f1,f2,…,fnIt is respectively divided by sample frequency fSObtain normalized frequency f '1,f′2,…,f′n；
Corresponding amplitude attenuation value: α1,α2,…,αnIt is normalized through following process and obtains normalization amplitude
Value α1′,α2′,…,αn':
Wherein, C is constant, for as required to the filter passband waveform designed and frequency range [fC-B/2 fC+ B/2] electricity
The fitting degree of cable attenuation characteristic curve is adjusted.
Step S504: the wave filter of design approximation cable properties.
In wave filter normalized frequency section [0 1], N number of Frequency point, wherein, N is taken in the normalized frequency obtained > n.Tool
Body selection mode is as follows:
1) if normalized frequency f1′=0,fn' < 1, then at normalized frequency section (fn' 1] N-n frequency is chosen in, this
The normalization range value of N-n frequency is αn′；
2) if normalized frequency f1′>0,fn'=1, then at normalized frequency section [0 f1') in choose N-n frequency, this
The normalization range value of N-n frequency is α1′；
3) if normalized frequency f1′>0,fn' < 1, then at normalized frequency section [0 f1') and (fn' 1] choose in respectively
Take n1And n2Individual Frequency point, n1+n2+ n=N, wherein, normalized frequency section [0 f1') in n1The normalization range value that individual frequency is corresponding
For α1', normalized frequency section (fn' 1] n in2The normalization range value that individual Frequency point is corresponding is αn′。
According to fixed N number of frequency and corresponding normalization range value, the corresponding filter in matlab can be used
The design order of ripple device designs corresponding wave filter, such as: can design low pass filter, the logical filter of firls design band with fir2
Ripple device etc..Q is the filter order of design.
Preferably, so that fit procedure is more convenient accurately, it is also possible to above-mentioned normalization process is improved:
First, signal is obtained by cable amplitude in carrier frequency f and signal bandwidth B according to cable attenuation characteristic figure
Decay；
Then, n normalized frequency point and corresponding normalization range value are obtained according to step S2；
Finally, then by first some f of normalized frequency point1' return 0, it may be assumed that
f1″=f1′-f1′=0,
f2″=f2′-f1′,
…
fn″=fn′-f1′
f1″,…,fn" being the frequency after returning " 0 ", its corresponding normalization range value keeps constant, now signal bandwidth
Interior mid frequencyThen the mode according still further to above-mentioned steps S3 obtains N number of Frequency point, and uses filtering in matlab
Device design order fir2 designs one group of low pass filter.Constant C in set-up procedure S2 make in pass band decay with
Frequency range [fC-B/2 fC+ B/2] inner cable attenuation characteristic curve approximate fits.Preferably, it is also possible to wait wave filter to carry out with band is logical
Realize the design of wave filter.
Step S506: obtain the letter with cable attenuation characteristic according to the fitting result of the cable properties in signal bandwidth
Number.
After carrying out curve fitting, the orthogonal modulation numeral of " 0 " frequency before one group of ADC that makes a start can be gathered in IDU
Signal x (n), is adjusted to carrier frequency f by this signal by numeral NCOCOn；Signal x ' (n) after frequency modulation is by step
X is obtained after the Q rank wave filter designed in S502 " (n), then be adjusted on " 0 " frequency through numeral NCO, output signal is y (n).
Cable properties is joined in known digital signal and obtains the signal with cable attenuation characteristic by this process.
Wherein, the mathematical formulae of numeral NCO is:
NCO=cos(2π*fC*n/fS)+jsin(2π*fC*n/fS)
The formula of mathematical of Digital Up Convert is: x ' (n)=x (n) * NCO
The formula of mathematical of Digital Down Convert is: y (n)=x " (n) * NCOH
Step S508: obtain precompensation coefficient according to the signal with cable attenuation characteristic.
It is assumed that the exponent number of preemphasis compensating filter FIR1, FIR2, FIR3 and FIR4 of default is M, i.e. mend
Repaying coefficient number is P, and originating data x (n) obtained according to step S506 and receiving end data y (n) also use LMS, RLS etc. adaptive
Algorithm for estimating is answered to be calculated the coefficient of 4 groups of FIR filter, as shown in Figure 6 and Figure 7.
By above-mentioned steps S504 and above-mentioned steps S506, by the attenuation characteristic of cable is carried out in said method
Matching generates FIR filter, and uses the data source of known signal bandwidth to carry out the simple and quick compensation estimating cable attenuation
Parameter.Achieve and solve the problem of the extraction of immediate frequency cable precompensation parameter in microwave system quickly and easily, such that it is able to simple
Single estimate accurately for the filter coefficient compensated required for cable attenuation.Compared with prior art, can mend by off-line
Repay the estimation of parameter, without the need for by analog feedback loop, decrease the loop impact on parameter estimation of feedback.
Below by a specific embodiment, above-mentioned algorithmic procedure is described.
Assume signal bandwidth B=49.6MHz, signal sampling speed fS=198.4MHz, signal crosses carrier wave during immediate frequency cable
Frequency f=350MHz.Now, the cable properties curve in signal bandwidth, as shown in Fig. 8 black real point part.Originating data x
N () is the QPSK symbol of stochastic generation.
On the basis of above-mentioned parameter, estimate that the detailed process of cable precompensation coefficient is as follows:
The cable properties in the signal bandwidth that frequency band is [325MHz 375MHz] can be obtained according to Fig. 8.In this frequency range
In the range of take n=5 frequency, wherein, fk=325+ (k-1) * 12.4, n=1,2 ... 5.This amplitude fading corresponding to 5 frequencies
Value is: α1=-26.1289, α2=-26.5655, α3=-26.9932,α4=-27.4125,α5=-27.8239。
5 frequencies gathered are carried out the normalized of frequency and amplitude attenuation value:
Wherein, frequency normalization:
fk'=fk/fS, k=1,2,3,4,5
The normalization of amplitude fading:
Wherein, current C takes 70.
The low pass filter of the cable attenuation characteristic in design fitted signal bandwidth.
First, the f in 5 frequencies that will gather1' carry out returning 0 process, the frequency obtained after the most above-mentioned normalization to become:
f1″=f1′-f1′=0,
Wherein, f1″,…,f5" being the frequency after returning " 0 ", the normalization range value of its correspondence keeps constant.
α1″=α1′,α2″=α2′,α3″=α3′,α4″=α4′,α5″=α5′
Then, wave filter normalized frequency [0 1] takes N=12 Frequency point, wherein, including f1″,…,f5", i.e. exist
(f5" 1] in take 7 Frequency points:
f6=0.51,f7=0.56,f8=0.6,f9=0.7,f10=0.8, f11=0.9,f12=1, the width that this 7 Frequency points are corresponding
Degree is: α6=α7=α8=α9=α10=α11=α12=α5
Then, according to these 12 wave filter frequency: f1″,f2″,…,f12" and amplitude alpha1″,α2″,…,α12", use
Wave filter design order fir2 in matlab.It is assumed that the filter order of dummycable is 21, it is special that design obtains matching cable
21 rank low pass filters of property.The now mid frequency of signal bandwidth
Originating data x (n) first passing through numeral NCO carry out up-conversion and obtain signal x ' (n), carrier frequency isThen x ' (n) is by the 21 rank cable low pass filters designed, and output signal is x " (n)；Then,
By cable wave filter laggard row number down coversion, output signal is y (n).Y (n) is the signal with cable attenuation characteristic.
Wherein, the mathematical formulae of numeral NCO is:
NCO=cos(2π*fC*n/fS)+jsin(2π*fC*n/fS)
The formula of mathematical of Digital Up Convert is: x ' (n)=x (n) * NCO
The formula of mathematical of Digital Down Convert is: y (n)=x " (n) * NCOH
Known ideal signal x (n) of making a start, cable feedback signal y (n), set the precompensation coefficient of cable as M rank, pass through
The ART network algorithms such as LMS, RLS obtain precompensation coefficient w of cable, and w is M rank plural numbers.Compensating filter FIR1 in Fig. 6,
The coefficient of FIR2, FIR3 and FIR4 is: FIR1 coefficient is the real part of precompensation coefficient w；FIR2 coefficient is the void of precompensation coefficient w
Portion；FIR3 coefficient is the imaginary part of precompensation coefficient w conjugation；FIR4 coefficient is the real part of precompensation coefficient w conjugation.
In another embodiment, additionally providing a kind of software, this software is used for performing above-described embodiment and the most real
Execute the technical scheme described in mode.
In another embodiment, additionally providing a kind of storage medium, in this storage medium, storage has above-mentioned software, should
Storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc..
As can be seen from the above description, present invention achieves following technique effect: according to cable at different carrier waves
Frequency determines the precompensation coefficient of cable corresponding different amplitude attenuation value, solves in prior art by feedback
The mode of circuit realizes the acquisition of precompensation coefficient and the accuracy of parameter estimation that causes is difficult to guaranteed technical problem,
Reach the technique effect of the accuracy improving precompensation coefficient, it is achieved that the simple mesh accurately estimating cable precompensation coefficient
's.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Calculating device realize, they can concentrate on single calculating device, or be distributed in multiple calculating device and formed
Network on, alternatively, they can with calculate the executable program code of device realize, it is thus possible to by they store
Performed by calculating device in the storage device, and in some cases, can perform with the order being different from herein shown
The step gone out or describe, or they are fabricated to respectively each integrated circuit modules, or by the multiple modules in them or
Step is fabricated to single integrated circuit module and realizes.So, the present invention is not restricted to the combination of any specific hardware and software.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. the acquisition methods of the precompensation coefficient of a cable, it is characterised in that including:
Obtain cable amplitude attenuation value of multiple Frequency points in predetermined band under given carrier frequency, wherein, the plurality of
The corresponding amplitude attenuation value of each Frequency point of Frequency point；
The precompensation coefficient of described cable it is worth to according to the plurality of Frequency point and described amplitude fading；
Wherein, it is worth to the precompensation coefficient of described cable according to the plurality of Frequency point and described amplitude fading, including: root
The wave filter corresponding with the cable properties of described cable is obtained according to the plurality of Frequency point and described amplitude attenuation value's matching；Will
Ideal signal passes through described wave filter, obtains corresponding to described cable being sampled by the ideal signal of described wave filter
Deamplification；The precompensation coefficient obtaining described cable is compared according to described deamplification and described ideal signal.
Method the most according to claim 1, it is characterised in that obtain cable under given carrier frequency in predetermined band
The amplitude attenuation value of multiple Frequency points, including:
Test by the actual signal of described cable, obtain the amplitude attenuation value under the plurality of Frequency point；Or
Obtain the corresponding relation between preset frequency and the amplitude attenuation value of described cable, determine according to described corresponding relation described
Amplitude attenuation value under multiple Frequency points.
Method the most according to claim 1, it is characterised in that according to the plurality of Frequency point and described amplitude attenuation value
Matching obtains the wave filter corresponding with the cable properties of described cable, including:
Amplitude attenuation value to the plurality of Frequency point with corresponding to each Frequency point of the plurality of Frequency point is normalized
Process；
The wave filter corresponding with the cable properties of described cable is obtained according to the result matching obtained after normalized.
Method the most according to claim 3, it is characterised in that to each Frequency point corresponding to the plurality of Frequency point
Amplitude attenuation value is normalized, including:
This frequency is determined according to the amplitude attenuation value corresponding to the previous Frequency point of each Frequency point and predetermined constant value
The normalization amplitude attenuation value of the corresponding amplitude attenuation value of point.
Method the most according to claim 3, it is characterised in that the plurality of Frequency point is normalized, including:
Each described Frequency point obtains the normalized frequency of described each described carrier frequency divided by sample frequency.
6. according to the method according to any one of claim 3 to 5, it is characterised in that to the plurality of Frequency point and correspondence
After the amplitude attenuation value of each described Frequency point is normalized, also include:
According to the maximum normalized frequency obtained after normalized and minimum normalized frequency, between 0 to 1, choose one
Individual or multiple normalized frequencies, and be that these one or more normalized frequencies select normalization amplitude attenuation value.
7. according to the method according to any one of claim 3 to 5, it is characterised in that at each described Frequency point divided by sampling
After frequency obtains the normalized frequency of described each described Frequency point, also include:
The minimum normalized frequency obtained after the normalized frequency of described each described Frequency point and normalized is subtracted each other；
The result obtained after subtracting each other is as normalized frequency, and wherein, this normalized frequency obtains and described cable for matching
The wave filter that characteristic is corresponding.
8. the acquisition device of the precompensation coefficient of a cable, it is characterised in that including:
Acquiring unit, for obtaining cable amplitude attenuation value of multiple Frequency points in predetermined band under given carrier frequency,
Wherein, the corresponding amplitude attenuation value of each Frequency point of the plurality of Frequency point；
Signal generating unit, for being worth to the precompensation system of described cable according to the plurality of Frequency point and described amplitude fading
Number；
Wherein, described signal generating unit includes: fitting module, for intending according to the plurality of Frequency point and described amplitude attenuation value
Close and obtain the wave filter corresponding with the cable properties of described cable；Sampling module, for ideal signal is passed through described wave filter,
To the deamplification obtained corresponding to described cable of being sampled by the ideal signal of described wave filter；Generation module, is used for
The precompensation coefficient obtaining described cable is compared according to described deamplification and described ideal signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210208062.2A CN103516394B (en) | 2012-06-21 | 2012-06-21 | The acquisition methods of the precompensation coefficient of cable and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210208062.2A CN103516394B (en) | 2012-06-21 | 2012-06-21 | The acquisition methods of the precompensation coefficient of cable and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103516394A CN103516394A (en) | 2014-01-15 |
| CN103516394B true CN103516394B (en) | 2016-08-24 |
Family
ID=49898519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210208062.2A Active CN103516394B (en) | 2012-06-21 | 2012-06-21 | The acquisition methods of the precompensation coefficient of cable and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103516394B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10048310B2 (en) * | 2014-09-17 | 2018-08-14 | Mitsubishi Electric Corporation | Partial discharge signal processing device |
| CN104569770B (en) * | 2015-01-29 | 2017-07-11 | 国家电网公司 | A kind of partial discharge time-frequency composite character parameter extracting method for extra-high-tension cable |
| CN107241160B (en) * | 2016-03-28 | 2021-03-23 | 华为技术有限公司 | Method and device for determining parameters |
| CN106506904B (en) * | 2016-11-16 | 2019-09-17 | 浙江大华技术股份有限公司 | A kind of method for transmitting signals and equipment |
| CN106488082B (en) * | 2016-11-23 | 2019-11-19 | 浙江大华技术股份有限公司 | The method and device for determining compensating parameter, compensating processing to vision signal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6466626B1 (en) * | 1999-02-23 | 2002-10-15 | International Business Machines Corporation | Driver with in-situ variable compensation for cable attenuation |
| CN101742213A (en) * | 2008-11-18 | 2010-06-16 | 宏正自动科技股份有限公司 | Cable length detection and signal compensation apparatus and method |
-
2012
- 2012-06-21 CN CN201210208062.2A patent/CN103516394B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6466626B1 (en) * | 1999-02-23 | 2002-10-15 | International Business Machines Corporation | Driver with in-situ variable compensation for cable attenuation |
| CN101742213A (en) * | 2008-11-18 | 2010-06-16 | 宏正自动科技股份有限公司 | Cable length detection and signal compensation apparatus and method |
Non-Patent Citations (1)
| Title |
|---|
| 同轴电缆测量纳秒脉冲信号衰减的数字补偿;付佳斌等;《强激光与粒子束》;20111031;第23卷(第10期);第2827-2829页2.2-2.4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103516394A (en) | 2014-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103516394B (en) | The acquisition methods of the precompensation coefficient of cable and device | |
| DE102014008347B4 (en) | METHOD AND DEVICE FOR CHANNEL ESTIMATION AND OFDM RECEIVER | |
| RU2392762C2 (en) | Device and method for optimum evaluation of distortions of transmission medium, involving successive generation of pairs of quadrature complementary sequences | |
| DE60223949T2 (en) | DYNAMIC BANDWIDTH ASSESSMENT OF THE PILOT SIGNAL FILTER | |
| CN105978602A (en) | Method and device for simultaneous same-frequency full-duplex nonlinear interference suppression | |
| TW201004230A (en) | Equalisation processing | |
| CN103312640A (en) | Channel estimation and IQ (In-phase Quadrature) imbalance united compensation method | |
| Wang et al. | Stochastic modeling and simulation of frequency-correlated wideband fading channels | |
| CN105678283A (en) | Noise reduction method and system for medium-voltage carrier signal through wavelet packet combining singular value | |
| Smith et al. | A communication channel density estimating generative adversarial network | |
| EP1912397A1 (en) | Signal transmitting apparatus and signal transmitting method | |
| CN105515711B (en) | Joint compressed sensing and the rangefinder Interference Suppression System for receiving diversity | |
| CN106033996B (en) | The monitoring device and receiver of optical signal to noise ratio | |
| US20030025593A1 (en) | Geometric harmonic modulation signaling and detection | |
| CN1440603B (en) | Method for generating signal having predetermined quality criterion for use in or on communication system | |
| CN107426121A (en) | Training sequence design and application process and device for broad sense Frequency Division Multiplexing system | |
| EP3143708B1 (en) | Non-linear propagation impairment equalisation in optical transmission | |
| CN106330792A (en) | In-band noise-filtering channel estimation algorithm and in-band noise-filtering channel estimation based on DTF transform domain | |
| CN101026607B (en) | Common frequency community downlink synchronous code detecting method and device | |
| US20020110199A1 (en) | Method for noise energy estimation in TDMA systems | |
| CN102340327B (en) | Interference elimination method and device | |
| CN109150245A (en) | The filtering method and system of non-stationary non-Gaussian noise in plc communication signal | |
| CN109039379A (en) | Electric-power wire communication signal filtering method | |
| US8750363B2 (en) | Methods and apparatus for weighted equalization | |
| CN106656884B (en) | A kind of Vector Signal Analyzer channel compensation method based on frequency domain parameter estimation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20140115 Assignee: SANECHIPS TECHNOLOGY Co.,Ltd. Assignor: ZTE Corp. Contract record no.: 2015440020319 Denomination of invention: Acquisition methods and the device of the precompensation coefficient of cable License type: Common License Record date: 20151123 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221028 Address after: 518055 Zhongxing Industrial Park, Liuxian Avenue, Xili street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: SANECHIPS TECHNOLOGY Co.,Ltd. Address before: 518057 No. 55 South Science and technology road, Shenzhen, Guangdong, Nanshan District Patentee before: ZTE Corp. |
|
| TR01 | Transfer of patent right |