CN106027120B - A kind of method for eliminating multi-conductor transmission lines near-end stable state crosstalk - Google Patents
A kind of method for eliminating multi-conductor transmission lines near-end stable state crosstalk Download PDFInfo
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- CN106027120B CN106027120B CN201610319759.5A CN201610319759A CN106027120B CN 106027120 B CN106027120 B CN 106027120B CN 201610319759 A CN201610319759 A CN 201610319759A CN 106027120 B CN106027120 B CN 106027120B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
Abstract
The invention discloses a kind of method for eliminating multi-conductor transmission lines near-end stable state crosstalk, go out near-end cross ratio according to the electromagnetic parameters of transmission line first, the frequency domain voltage signal of signal source is gathered again, frequency domain voltage signal is changed into by " play a reversed role and disturb " signal by near-end cross ratio, signal of " playing a reversed role and disturb " most at last injects transmission line near-end, eliminates near-end stable state crosstalk.The present invention uses active technology for eliminating, is not only able to eliminate the crosstalk of same frequency, and design method is simple.
Description
Technical field
The invention belongs to signal noise silencing technical field, a kind of more particularly to elimination multi-conductor transmission lines near-end stable state crosstalk
Method.
Background technology
With modern electrical, the development of electronic technology, the electromagnetic interference problem in complication system is more and more prominent.Typically
Electromagnetic interference is divided into Conduction Interference and radiation interference, they pay close attention to equipment (system) to extraneous interference；It is and another form of
Electromagnetic interference --- crosstalk is unintentionally electromagnetic coupled between transmission line, it is primarily upon the interference to itself inside equipment.Crosstalk
The bit error rate of signal transmission can be caused to rise, influence signal integrity, ultimately result in signal transmission quality decline.
The suppression of crosstalk or technology for eliminating are always the research emphasis of crosstalk.Shielding and multiple twin difference are typically to suppress string
The main means disturbed.In addition, the subplan such as communication code, passive filter can be used for continuing reducing between transmission line
Influence of the crosstalk to signal transmission quality, but use coding method to eliminate crosstalk, being related to for its coding is complex, and passive
Filtering can only also eliminate the crosstalk of different frequency, can not eliminate the crosstalk of same frequency.
The content of the invention
In order to solve the technical problem that above-mentioned background technology proposes, the present invention is intended to provide a kind of eliminate multi-conductor transmission lines
The method of near-end stable state crosstalk, using active technology for eliminating, is compensated by injecting " play a reversed role and disturb " signal to transmission line, can be with
The crosstalk of same frequency is eliminated, and method is simple.
In order to realize above-mentioned technical purpose, the technical scheme is that：
A kind of method for eliminating multi-conductor transmission lines near-end stable state crosstalk, comprises the following steps：
(1) electromagnetic parameter of multi-conductor transmission lines is calculated, the near-end crosstalk of the multi-conductor transmission lines is obtained using electromagnetic parameter
Disturb and compare NEXT；
(2) discrete time signal in sampled signal source, continuous periodic signal is converted into by discrete time signal connection；
(3) continuous periodic signal is subjected to Fourier transformation, obtains the frequency domain voltage signal of signal sourceIncluding each
The amplitude information and phase information of Frequency point；
(4) by near-end cross than NEXT, by the frequency domain voltage signal of signal sourceIt is converted into crosstalk frequency domain voltage signal
(5) by crosstalk frequency domain voltage signalPhase information be adjusted to anti-phase, obtain " play a reversed role and disturb " frequency domain voltage signal
(6) inverse Fourier transform is carried out to " play a reversed role and disturb " frequency domain voltage signal, obtains " play a reversed role and disturb " time domain voltage signal, selected
The injection mode of " play a reversed role and disturb " time domain voltage signal is selected, if selection voltage injection mode, directly " will play a reversed role and disturb " time domain voltage letter
Number injection transmission line proximal port；If selecting electric current injection mode, " will play a reversed role and disturb " time domain voltage signal divided by transmission line
The proximal port of transmission line is injected after near-end resistance.
Further, in step (1), the electromagnetic parameters of the multi-conductor transmission lines includes mutual inductance between transmission line and mutually
Hold.
Further, in step (1), near-end cross is as follows than the calculation formula of NEXT：
In above formula, d is the length of transmission line, and ω is angular frequency, and j represents imaginary number, RS、RL、RNEAnd RFERespectively signal source
Source resistance, load resistance, near-end resistance and distal end resistance, lm、cmMutual inductance and mutual tolerance between respectively transmitting.
Further, in step (6), if selection voltage injection mode, " will be played a reversed role and disturbed " time domain voltage using transformer
Signal injects the proximal port of transmission line.
Further, in step (6), if selection electric current injection mode, clamped using electric current injection by time domain voltage signal
Divided by the proximal port of the current signal injection transmission line after near-end resistance.
The beneficial effect brought using above-mentioned technical proposal：
Traditional crosstalk technology for eliminating, generally from the aspect of communication code and passive filtering, the present invention is mainly from active
From the aspect of filtering, the near-end cross between transmission line is eliminated by way of injecting " play a reversed role and disturb ".Relative to passive filtering side
Formula can only eliminate the crosstalk of different frequency, and method proposed by the invention can eliminate near-end cross under same frequency.Meanwhile this
The complexity of method is less than the mode of communication code, is traded off between using effect and complexity.
Brief description of the drawings
Fig. 1 is the method schematic diagram of the present invention；
Fig. 2 is voltage injection mode schematic diagram of the present invention；
Fig. 3 is electric current injection mode schematic diagram of the present invention.
Embodiment
Below with reference to attached drawing, technical scheme is described in detail.
As shown in Figure 1, a kind of method for eliminating multi-conductor transmission lines near-end stable state crosstalk, comprises the following steps：
Step 1：Finite element analysis is carried out to the practical structures of multi-conductor transmission lines, or transmission is calculated using empirical equation
The electromagnetic parameter of line, including mutual inductance l between transmission linem, mutual tolerance cm.Utilize the near of these electromagnetic parameters multi-conductor transmission lines
NEXT is compared in end crosstalk：
Wherein, d is the length of transmission line, and ω is angular frequency, and j represents imaginary number, RS、RL、RNEAnd RFERespectively signal source
Source resistance, load resistance, near-end resistance and distal end resistance.
Step 2：The discrete time signal in sampled signal source, continuous cycle letter is converted into by discrete time signal connection
Number, which should be approximate with practical power voltage signal.
Step 3：Continuous periodic signal is subjected to Fourier transformation, obtains the frequency domain voltage signal of signal sourceIncluding
The amplitude information and phase information of each Frequency point.
Step 4：By near-end cross than NEXT, by the frequency domain voltage signal of signal sourceIt is converted into crosstalk frequency domain voltage letter
Number
Step 5：By crosstalk frequency domain voltage signalPhase information be adjusted to anti-phase, obtain " play a reversed role and disturb " frequency domain voltage
Signal
Step 6：Inverse Fourier transform is carried out to " play a reversed role and disturb " frequency domain voltage signal, obtains " play a reversed role and disturb " time domain voltage letter
Number, the injection mode of " play a reversed role and disturb " time domain voltage signal is selected, if selection voltage injection mode, directly " will play a reversed role and disturb " time domain electricity
Press the proximal port of signal injection transmission line；If selecting electric current injection mode, " will play a reversed role and disturb " time domain voltage signal divided by biography
The proximal port of transmission line is injected after defeated line near-end resistance.
If as shown in Fig. 2, selection voltage injection mode, using transformer will " play a reversed role and disturb " time domain voltage signal injection transmit
The proximal port of line.
If as shown in figure 3, selection electric current injection mode, using electric current injection pincers will play a reversed role disturb " time domain voltage signal divided by
The proximal port of current signal injection transmission line after near-end resistance.
Necessary to master produces the pre-set time of signal when sending " play a reversed role and disturb " signal, because controller and circuit are held in itself
Row produces the time that signal the methods of needing the regular hour, passing through dis-assembling calculation procedure is consumed in the controller, can be with
The real-time of crosstalk canceller is allowed to be met.
Above example is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical solution, each falls within the scope of the present invention
Within.
Claims (5)
- A kind of 1. method for eliminating multi-conductor transmission lines near-end stable state crosstalk, it is characterised in that comprise the following steps：(1) electromagnetic parameter of multi-conductor transmission lines is calculated, the near-end cross ratio of the multi-conductor transmission lines is obtained using electromagnetic parameter NEXT；(2) discrete time signal in sampled signal source, continuous periodic signal is converted into by discrete time signal connection；(3) continuous periodic signal is subjected to Fourier transformation, obtains the frequency domain voltage signal of signal sourceIncluding each frequency The amplitude information and phase information of point；(4) by near-end cross than NEXT, by the frequency domain voltage signal of signal sourceIt is converted into crosstalk frequency domain voltage signal<mrow> <msub> <mover> <mi>U</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>N</mi> <mi>E</mi> </mrow> </msub> <mo>=</mo> <mi>N</mi> <mi>E</mi> <mi>X</mi> <mi>T</mi> <mo>&CenterDot;</mo> <msub> <mover> <mi>U</mi> <mo>&OverBar;</mo> </mover> <mi>s</mi> </msub> <mo>;</mo> </mrow>(5) by crosstalk frequency domain voltage signalPhase information be adjusted to anti-phase, obtain " play a reversed role and disturb " frequency domain voltage signal<mrow> <msub> <mover> <mi>U</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>I</mi> <mi>N</mi> <mi>E</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <msub> <mover> <mi>U</mi> <mo>&OverBar;</mo> </mover> <msub> <mrow></mrow> <mrow> <mi>N</mi> <mi>E</mi> </mrow> </msub> </msub> <mo>;</mo> </mrow>(6) inverse Fourier transform is carried out to " play a reversed role and disturb " frequency domain voltage signal, obtains " play a reversed role and disturb " time domain voltage signal, selected The injection mode of " play a reversed role and disturb " time domain voltage signal, if selection voltage injection mode, directly " will play a reversed role and disturb " time domain voltage signal Inject the proximal port of transmission line；If selection electric current injection mode, " will play a reversed role and disturb " time domain voltage signal divided by transmission line it is near The proximal port of transmission line is injected after the resistance of end.
- A kind of 2. method for eliminating multi-conductor transmission lines near-end stable state crosstalk according to claim 1, it is characterised in that：In step Suddenly in (1), the electromagnetic parameter of the multi-conductor transmission lines includes the mutual inductance between transmission line and mutual tolerance.
- A kind of 3. method for eliminating multi-conductor transmission lines near-end stable state crosstalk according to claim 2, it is characterised in that：In step Suddenly in (1), near-end cross is as follows than the calculation formula of NEXT：<mrow> <mi>N</mi> <mi>E</mi> <mi>X</mi> <mi>T</mi> <mo>=</mo> <mi>j</mi> <mi>&omega;</mi> <mi>d</mi> <mrow> <mo>(</mo> <mfrac> <msub> <mi>R</mi> <mrow> <mi>N</mi> <mi>E</mi> </mrow> </msub> <mrow> <msub> <mi>R</mi> <mrow> <mi>N</mi> <mi>E</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>F</mi> <mi>E</mi> </mrow> </msub> </mrow> </mfrac> <mfrac> <msub> <mi>l</mi> <mi>m</mi> </msub> <mrow> <msub> <mi>R</mi> <mi>S</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mi>L</mi> </msub> </mrow> </mfrac> <mo>+</mo> <mfrac> <mrow> <msub> <mi>R</mi> <mrow> <mi>N</mi> <mi>E</mi> </mrow> </msub> <msub> <mi>R</mi> <mrow> <mi>F</mi> <mi>E</mi> </mrow> </msub> </mrow> <mrow> <msub> <mi>R</mi> <mrow> <mi>N</mi> <mi>E</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>F</mi> <mi>E</mi> </mrow> </msub> </mrow> </mfrac> <mfrac> <mrow> <msub> <mi>R</mi> <mi>L</mi> </msub> <msub> <mi>c</mi> <mi>m</mi> </msub> </mrow> <mrow> <msub> <mi>R</mi> <mi>S</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mi>L</mi> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> </mrow>In above formula, d is the length of transmission line, and ω is angular frequency, and j represents imaginary number, RS、RL、RNEAnd RFEThe respectively source of signal source Resistance, load resistance, near-end resistance and distal end resistance, lm、cmMutual inductance and mutual tolerance between respectively transmitting.
- A kind of 4. method for eliminating multi-conductor transmission lines near-end stable state crosstalk according to claim 1, it is characterised in that：In step Suddenly in (6), if selection voltage injection mode, the near-end end for the time domain voltage signal injection transmission line that " will play a reversed role and disturb " using transformer Mouthful.
- A kind of 5. method for eliminating multi-conductor transmission lines near-end stable state crosstalk according to claim 1, it is characterised in that：In step Suddenly in (6), if selection electric current injection mode, " will play a reversed role and disturb " time domain voltage signal divided by the resistance of near-end resistance are clamped using electric current injection The proximal port of current signal injection transmission line after value.
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| CN106027120B true CN106027120B (en) | 2018-05-08 |
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| CN106844850B (en) * | 2016-12-16 | 2020-02-18 | 南京航空航天大学 | Design method of eliminating circuit for far-end crosstalk noise |
| CN109743079B (en) * | 2018-12-06 | 2021-08-06 | 南京航空航天大学 | Cable bundle far-end crosstalk elimination method for realizing impedance conversion by connecting single stub wires in parallel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772900A (en) * | 2007-05-29 | 2010-07-07 | 诺基亚西门子通信公司 | The method and apparatus of crosstalk evaluation and the communication system that comprises this device |
| CN104021287A (en) * | 2014-06-03 | 2014-09-03 | 哈尔滨工程大学 | Method for estimating crosstalk magnitude, caused by electromagnetic interference of external transient state, of PCB microstrip transmission line |
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2016
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772900A (en) * | 2007-05-29 | 2010-07-07 | 诺基亚西门子通信公司 | The method and apparatus of crosstalk evaluation and the communication system that comprises this device |
| CN104021287A (en) * | 2014-06-03 | 2014-09-03 | 哈尔滨工程大学 | Method for estimating crosstalk magnitude, caused by electromagnetic interference of external transient state, of PCB microstrip transmission line |
Non-Patent Citations (3)
| Title |
|---|
| PCB传输线间串扰抑制方法分析;杜廷辉等;《计算机仿真》;20100930;第27卷(第9期);第323-327页 * |
| VDSL系统中的串扰消除技术研究;李香雪;《中国优秀硕士学位论文全文数据库 信息科技辑》;20121231;I136-194 * |
| 高速电路电源完整性及串扰的研究;孔德升;《中国优秀硕士学位论文全文数据库 信息科技辑》;20151231;I135-229 * |
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