CN101542927B - Signal transmission system - Google Patents
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- CN101542927B CN101542927B CN200780043497.3A CN200780043497A CN101542927B CN 101542927 B CN101542927 B CN 101542927B CN 200780043497 A CN200780043497 A CN 200780043497A CN 101542927 B CN101542927 B CN 101542927B
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- 230000008054 signal transmission Effects 0.000 title claims description 18
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims description 38
- 230000009466 transformation Effects 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 15
- 230000008030 elimination Effects 0.000 claims description 10
- 238000003379 elimination reaction Methods 0.000 claims description 10
- 230000005764 inhibitory process Effects 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012804 iterative process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalanced currents in a normally balanced line
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- Engineering & Computer Science (AREA)
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
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Abstract
A method of operating a system (100, 200) for transmitting signals (si, S2, 202) from a transmitter (101, 206) to a receiver (104, 207), the method comprising the step of muting the transmitter (101, 206), adjusting a receiver transfer function of the receiver (104, 207) so that an output signal (Sout) of the receiver (104, 207)is minimized, and setting a transmitter transfer function of the transmitter (101, 206) to be inverse to the adjusted receiver transfer function.
Description
Technical field
The present invention relates to a kind of operation and be used for signal is transferred to from transmitter the method for the system of receiver.
And, the present invention relates to a kind of computer-readable medium.
In addition, the present invention relates to a kind of program unit.
In addition, the present invention relates to a kind of transmitter.
In addition, the present invention relates to a kind of receiver.
At last, the present invention relates to a kind of signal transmission system.
Background technology
Transfer of data is extremely important in many technical fields, comprises RFID (" radio-frequency (RF) identification ") system.A data transmission system that has for many transmission channels of transmitted signal, there are some common mode disturbances problems.A kind of signal disturbance phenomenon of this term description, this phenomenon occurs when many signal line are interfered the interference of signal in the same manner.
WO2005/011139 discloses a kind of electronic circuit for reducing the digital user loop noise.In order to reduce the noise in the communication that produces on the unshielded twisted pair of metallic conductor, the active electronic circuit that is used for two to four line hybrid circuits has reduced common-mode signal, and does not rely on inductance element.Hybrid circuit comprises a balancing network, and this balancing network dynamically changes its impedance, to realize and two-wire circuit impedance balance closely.Remaining common-mode signal is eliminated.Resistor is connected to circuit, and this circuit high impedance of generation and a virtual earth, and high impedance is used for difference mode signal, and virtual earth is used for common-mode signal.
But due to the impact of interference signal, common data transmission system suffers damage because signal quality is not enough.
Summary of the invention
An object of the present invention is and to carry out the signal transmission with enough quality.
In order to realize the purpose of above definition, provide a kind of operation to be used at the environment that may have interference signal, signal being transferred to from transmitter the method for the system of receiver, the method comprises the steps: transmitter is carried out noise elimination, adjust the receiver transfer function of receiver so that the output signal of receiver is minimum, and the sender transfer functions that transmitter is set makes it become the inverse transformation of adjusted receiver transfer function.
In order to realize purpose of the present invention, in addition, provide a kind of computer-readable medium (as CD, DVD, the USB rod, floppy disc or hard disk), wherein storage is used at the environment that may have interference signal, signal being transferred to from transmitter the computer program of receiver, when processor was carried out this computer program, this computer program was applicable to control or carry out the method with the above feature.
In order to realize purpose of the present invention, in addition, provide a kind of at the environment that may have interference signal, signal is transferred to the program unit of receiver from transmitter, when processor was carried out this program unit, this program unit was applicable to control or carry out the method with the above feature.
In order to realize purpose of the present invention, in addition, provide a kind of at the environment that may have interference signal, signal is transferred to the transmitter of the system of receiver from transmitter, this transmitter comprises for transmitter being carried out the noise elimination unit of noise elimination, and a setting unit that is used for the sender transfer functions of transmitter is made as the inverse transformation of receiver transfer function.
In order to realize purpose of the present invention, in addition, provide a kind of at the environment that may have interference signal, signal is transferred to the receiver of the system of receiver from transmitter, this receiver comprises: adjustment unit, it adjusts the receiver transfer function of receiver under the transmitter noise-limited condition, so that the output signal of receiver is minimum; And transmission unit, be used for adjusted receiver transfer function is sent to transmitter, so that the sender transfer functions of transmitter transmitter is set to the inverse transformation of adjusted receiver transfer function.
In order to realize purpose of the present invention, last, a kind of signal transmission system is provided, it comprises a transmitter of the present invention, this transmitter is used for transferring signals to receiver of the present invention.
According to the present invention, a kind of system for the calibration communication equipment is provided, the interference signal in this system (or disturbing signal) has obtained effective inhibition.According to such system, make transmitter enter noiseless non-transmission state.Under this state, adjust the transfer function of receiver with a kind of method, be derived from the output signal of interference signal in environment to reduce as much as possible receiver.Then, adjust in this way transmitter, making its transfer function is the inverse transformation of the transfer function of receiver basically.By doing like this, suppressed common mode disturbances, and obtained to have the transfer of data of improved common mode inhibition.Even this system allows when many transmission paths of use (for example, differential data transmission system in) also effectively impact of the interference signal on the Inhibitory signal transmission line.This in the situation that interference signal not wait or different modes is coupled in different transmission path and still keeps.Should note, transmission channel can be based on wired (for example, pass through cable, as with the similar mode of usb communication), or (for example, use the 13.56MHz frequency of rfid system, use Bluetooth system based on the radio communication according to corresponding wireless data transmission protocols, use infrared communication, etc.).In addition, should note, be used for to suppress interference signal and process and data communication calibration can realize by computer program according to the signal that embodiments of the invention improve signal quality, or by using one or more special electronic optimization circuits to realize, computer program is realized by software, the form realization that special electronic optimization circuits is passed through hardware or mixed with hardware cell by software unit.
Term " transfer function " refers in particular to a kind of (mathematics filter) function, describes the output signal of signal operation unit and the ratio of input signal, especially in time-invariant system.Transfer function is described the signal operation unit to will be by the impact of the signal of signal operation cell processing.
Term " inverse transformation transfer function " refers in particular in the mode that is compensated former transfer function impact by the inverse transformation transfer function and revises transfer function.In the situation that scalar transfer function, inverse transformation equals long-pending with the factor-1.
Term " interference signal " refers in particular to any signal that affects useful signal, and it passes through transmission channel in undesirable or unexpected mode.
Another exemplary embodiment of the inventive method of after this explaining, this embodiment is equally applicable to computer-readable medium, program unit, transmitter, receiver and signal transmission system.
Signal being transferred to the step of receiver if the method is included in to adjust the receiver transfer function and arrange from transmitter after sender transfer functions, is favourable.In other words, at first, carry out the calibration phase place, wherein, adjust receiver transfer function and sender transfer functions, with the impact of effective inhibition interference signal on data transmission link.Then, carry out data communication with suitable data transmission quality.
Signal being transferred to the step of receiver from transmitter if the method comprises by multichannel (especially multi-line) communication, is more favourable.For example, signal transmits as the mode with difference by two-wire or more multi-route transmission.In this case, interference signal is coupled in different communication paths in a different manner.Even so also allowing suitable transmission quality under rugged environment according to the inhibition scheme of the interference signal of exemplary embodiment of the present invention.
Advantageously, the method comprises the step of adjusting the receiver transfer function by gain and/or the phase parameter of adjustment receiver feature.Gain and phase place are two suitable (filter) parameters, can revise the impact that these two parameters suitably suppress interference signal.
Advantageously, the method also comprises the step of adjusting the receiver transfer function by a plurality of levels of adjusting receiver.For example, receiver has two input stages, and transmitter has two output stages.Then, adjust separately the transfer function of expression performances at different levels, thereby improve the accuracy of adjusting.At first, transmitter is by noise elimination, and determines the receiver transfer function by the input stage (as gain and phase place) of adjusting receiver, so that output signal is minimum.At last, sender transfer functions is set to the receiver transfer function of inverse transformation, and the beginning transfer of data.By adopting this measure, can compensate interference signals different on transmission line, thereby especially can by two-wire or more multi-line improve transfer of data.
Advantageously, the method also comprises the steps: by adjusting a plurality of levels of transmitter, sender transfer functions to be set, and makes it become the inverse transformation of the transfer function separately of a plurality of grades of receiver.Therefore, each state of transmitter is relevant to the level of receiver, or vice versa.By taking this measure to realize a plurality of levels of transmitter and receiver, can realize the adjustment of good transmission property.
Advantageously, the method also comprises adjusting the step of receiver transfer function according to the method for frequency.By carrying out such subtraction according to frequency, can carry out emulation to the transfer function of disturbance channel, and can be with advanced person's mode compensate for disturbances signal.In other words, can carry out according to frequency the subtraction of signal in differential data transmission scheme.Herein, frequency refers to the frequency of the data-signal that is transmitted.
After this will explain another exemplary embodiment of signal transmission system of the present invention, this embodiment also is applicable to method, computer-readable medium, program unit, the Receiver And Transmitter invented.
If signal transmission system comprises for signal is transferred to the signal channel of receiver from transmitter, and comprise (independent) transfer function transmission channel, being used for adjusted receiver transfer function is transferred to transmitter from receiver, is favourable.Signal channel is the channel of the transmission of data or signal.The transfer function transmission channel is that receiver sends the communication channel of the adjusted transfer function parameters on the basis of adjusting as the transfer function of inverse transformation to transmitter, for example by a feedback loop.Then, transmitter is adjusted its transfer function, makes it become the inverse transformation of receiver transfer function.
In addition, if transmitter and receiver is arranged in same equipment, be favourable, transceiver for example.The RFID reader is the example of such embodiment, wherein, and the initial radiofrequency signal that sends and the signal that will be transmitted of the radiofrequency signal formation by current RFID tag modulates or decay.In this case, in equipment, the wired or wireless tie line between Receiver And Transmitter is sent to transmitter with adjusted transfer function parameters from receiver.
According to another embodiment, transmitter and receiver is the assembly of two distinct devices.In this case, independent being used for may be favourable or necessary with transfer function from the data communication channel that transmitter is sent to receiver.Such system may comprise the ancillary equipment that is connected in computer by several USB.When signal is transferred to computer from ancillary equipment, or when being transferred to ancillary equipment from computer, one in communication object as transmitter, and another is as receiver.
The signal transmission system example comprises RFID reader, contactless chip cards reader, usb data transmission system, or the telephone signal transmission system.In the situation that reader is used for transponder, signal transmission system can form the part of the base station of reading (for example moving/wireless) transponder.Such reader can be and wireless radio frequency identification mark (RFID label) or the base station of working together with (for example contactless) smart card.
The RFID label generally includes the semiconductor chip (having integrated circuit) of storage data, and a high frequency antenna that mates with working band used (as 13.56MHz).Except the RFID label, rfid system comprises that also read/write device is (as the base station, also referred to as " reader ") and can make the system antenna that carries out the double-direction radio data communication between RFID label and read/write device (as loop antenna, unipole antenna, or dipole antenna).In addition, input-output apparatus (for example computer) is used for controlling read/write device.Known rfid system dissimilar, it is the rfid system (powered battery that battery is assisted, wherein usually complete back-modulation by load-modulate (RF) or backscattering (microwave)), active RFID system (powered battery, wherein initiatively carry out back-modulation), and passive RFID system (with the RF field power supply of launching by reader, wherein modulate (RF) by working load or back-modulation is completed in backscattering (microwave)).In addition, passive activation and wherein battery through require (for example for the transmission of data) and use half initiatively (semi-passive) system be available.
Smart card or chip card typically refer to the minimum safe and secret processor that is embedded in card credit card-sized or even less, as the GSM card.Smart card does not comprise battery usually, but by card reader/write device power supply, namely by be used for controlling reading and/or the write device power supply of intelligent card function, read and/or write device by from the smart card read data or by data being write the function that smart card is controlled smart card.Smart card device is generally used for financial field, secure access and transportation system.Smart card generally includes the processor of high safety, its function as the card data security storage (for example name, account, credit rating) that keeps data.Only have card is inserted or is connected to read/write terminal, just can access these data.
According to another exemplary embodiment of the present invention, calibration described above and data transmission scheme also are used for the distortion (as ripple) of the voltage of inhibition power voltage supply unit generation.By taking these measures, can avoid voltage drop or other distortion.Especially, can obtain the level and smooth effect of voltage.When distorted signals being detected, in order to adjust signal, this system can be used for amplifier.In low pass filter, can come smooth voltage by the inhibition that interference signal is carried out according to frequency.
Described embodiment and relative explaining can obviously draw aspect defined above and other side of the present invention hereafter.
Description of drawings
After this will the present invention be described in more detail by the method for example.But be limitation of the present invention.
Fig. 1 and Fig. 2 show the signal transmission system according to exemplary embodiment of the present invention.
Embodiment
Explanation in diagram is illustrative.In different diagrams, provide identical reference symbol to similar or identical unit.
Fig. 1 shows signal transmission system 100 according to an embodiment of the invention.
Input to transmitter 101 provides input signal S
inThis input signal S
inProduced the Difference signal pair S with opposite phase thereby process in transmitter 101
1And S
2
In this example, interference source 105 acts on signal S between data transmission link 102 and 103 transmission periods
1And S
2Interference signal S
3Expression.According to this embodiment, interference signal S
3To first signal S
1Interference describe by transfer function A3, with expression interference signal S
3To secondary signal S
2The transfer function A4 of interference different.
Usually, think that A3 and A4 are identical.But, in many situations, due to interference signal S
3To signal S
1And S
2Impact different, so this is the unsuitable data transmission quality that rough approximation produces.
After receiver 104 receives, again process the signal that has received, especially process according to the transfer function of receiver 104, and output signal S
outBy receiver 104 outputs.
According to embodiments of the invention, suppress interference signal S by the correlation method that after this will explain in more detail
3To signal S
1(being described by A3) and S
2The interference of (being described by A4).
The method according to this invention is come operating system 100 by the mode of at first transmitter 101 being introduced noiseless or noise-limited condition.Under such noise-limited condition, there is no that signal sends by communication channel 102 and 103 from transmitter 101.
Under this mode of operation, by making the output signal S of receiver 104
outFor acceptable little or or even minimum mode adjust the receiver transfer function of receiver 104.The known corresponding optimized algorithm of those skilled in the art.For example, gain and/or phase parameter are increased or decay, and the surveillance response.If this change has improved quality and has reduced output signal S
out, be acceptable, otherwise refuse it.By such iterative process, can obtain optimum transfer function.That is, when not having useful signal to be sent to receiver 104 from transmitter 101, S
outShould be in the ideal case " 0 ".
In order to make interference signal S
3Impact minimum, adjust the transfer function of receiver 104.By feedback line 106, send adjusted receiver transfer function parameters to transmitter 101.Based on these data, the sender transfer functions of transmitter 101 is adjusted into the inverse transformation of the receiver transfer function of receiver 104.Then, beginning transfer of data.By adjusting the transfer function of transmitter 101 and receiver 104, due to the interference that has suppressed interference source 105, therefore improve or optimized signal transmission quality.
In view of such analysis, transmitter 101 comprises noise elimination unit 110, is used for making transmitter 101 noise eliminations,, transmitter 101 is introduced the mode of operation of a noiseless not transmitted signal that is.The setting unit 120 of transmitter 101, the sender transfer functions that is used for transmitter 101 is set to the inverse transformation of the receiver transfer function of previous adjusted receiver 104, so that the output signal S of receiver 104
outMinimum.
In addition, in view of such analysis, receiver 104 comprises adjustment unit 130, is used for adjusting the receiver transfer function of receiver 104 under the state of transmitter 101 noise eliminations, so that the output signal S of receiver 104
out Minimum.Transmission unit 140 is used for sending adjusted receiver transfer function to transmitter 101 by feedback loop 106, makes transmitter 101 its sender transfer functions be set to the inverse transformation of adjusted receiver transfer function.
Fig. 1 shows transmitter 101, and it is accommodated in the equipment different from receiver 104.In contrast, Fig. 2 shows rfid system 200 (this is a special case of wireless transmitting system), and wherein transmitter 206 and receiver 207 are accommodated in same equipment, namely in RFID reader 201.
Transmitter 206 (as by sending coil) transmitted signal 202 then by RFID label 203 modulation signals 202, makes receiver 207 (as passing through receiving coil) detect modulation signal 204.
In order to control that the signal that undertaken by transmitter 206 sends and to receive by the signal that receiver 207 carries out, provide control unit (CPU for example, CPU) 205.And signal is processed by CPU 205.In addition, by control unit 205, will be sent to transmitter 206 from receiver 207 for the transfer function of having adjusted at receiver 207 that suppresses interference signal, so that the transfer function of transmitter 206 is the inverse transformation of the transfer function of receiver 207.
Hereinafter, will be by explaining with reference to figure 1 according to the scheme of the adjustment transfer function of exemplary embodiment of the present invention.At length, described scheme has been completed the symmetric of symmetrical system and has been adjusted, to suppress common mode disturbances.
In traditional system, realize by the following method symmetry.Transmitter 206 amplification input signal S
in, produce two signal S with opposite phase
1And S
2, and make it pass through two transmission channels 102,103 transmission.At receiver 104, signal subtraction, and S as a result
outShould with input signal S
inIdentical.
The transfer function of transmitter 101: A
T (S)
The transfer function of receiver 104: A
R (S)
With interference signal S
3Be coupled in the transfer function of the first transmission channel 102: A3
With interference signal S
3Be coupled in the transfer function of the second transmission channel 103: A4
Be coupled in two transmission channels 102,103 signal is as follows:
S
1(S)＝1/2S
in(S)A
T(S)
S
2(S)＝1/2S
in(S)A
T(S)(-1)
The signal that obtains is:
S
out(S)＝(S
1(S)+A3S
3(S))A
R(S)-(S
2(S)+A4S
3(S))A
R(S)
In traditional system, think that coupling transfer function A3 and the A4 of interference signal equates.In this case, common mode disturbances is eliminated by subtracting each other in receiver 104.
S
out(S)＝S
in(S)A
T(S)A
R(S)
In fact, subtracting each other in receiver 104 not make the reason that common mode disturbances is offset be to disturb transfer function A3 and A4 and unequal.
In order to reduce or minimise interference according to embodiments of the invention, can make with the following method.
The first step, transmitter 206 transfers to quiet.Therefore, receive only interference signal.Like this, adjust two input stage A
R1 (S)And A
R2 (S)Gain and phase place, make output signal minimum.
S
out(S)＝A
R1(S)A3S
3(S)-A
R2(S)A4S
3(S)＝0→A
R1(S)A3＝A
R2(S)A4
For the different transfer functions of compensated receiver 104, second step, making sender transfer functions is the inverse transformation of the transfer function of receiver 104,
A
T1(S)＝(A
R1(S))
-1
A
T2(S)＝(A
R2(S))
-1
The 3rd step, proceed to transmit signal.Suppress common mode disturbances by different sender transfer functions and receiver transfer function.
At last, should be noted that above-mentioned embodiment explanation does not limit the present invention, and in the situation that do not break away from the scope of the invention of additional claim definition, those technology herein can be used for designing many alternate embodiments.In the claims, the reference symbol in any round parentheses is not interpreted as the restriction claim.Word " comprises " and element outside one of claim or specification integral body or the existence of step are not got rid of in the use of making up.The singular reference of element is not got rid of the plural reference of these elements, and vice versa.Enumerate some devices in the equipment claim, several same of may be included in software or hardware in these devices.In fact, enumerating the combination that some equipment do not represent these equipment in mutually different and relevant claim can not be used for making a profit.
Claims (10)
1. an operation is used for signal (S1, S2,202) being transferred to the method for the system (100,200) of receiver (104,207) from transmitter (101,206), and the method comprising the steps of:
Make transmitter (101,206) noise elimination;
Adjust the receiver transfer function of receiver (104,207), so that output signal (Sout) minimum of receiver (104,207);
The sender transfer functions of transmitter (101,206) is set, is the inverse transformation of adjusted receiver transfer function.
2. method according to claim 1, comprise by multichannel communication path (102,103), signal (S1, S2) being transferred to the step of receiver (104) from transmitter (101).
3. method according to claim 1, comprise the step of adjusting the receiver transfer function by adjusting yield value and/or phase value.
4. method according to claim 1, comprise the step of adjusting the receiver transfer function by a plurality of levels of adjusting receiver (104).
5. method according to claim 4, comprise step: by a plurality of levels of adjusting transmitter (101), sender transfer functions is set, is the inverse transformation of the transfer function separately of a plurality of grades of receiver (104).
6. method according to claim 1, comprise adjusting the step of receiver transfer function according to the mode of frequency.
7. one kind is used for signal (S1, S2,202) being transferred to the transmitter (101,206) of the system (100,200) of receiver (104,207) from transmitter (101,206), and transmitter (101,206) comprising:
Noise elimination unit (110) is used for making transmitter (101,206) noise elimination;
Setting unit (120), be used for the sender transfer functions of transmitter (101,206) is set to the inverse transformation of the receiver transfer function through adjusting of receiver (104,207), so that output signal (Sout) minimum of receiver (104,207).
8. one kind is used for signal (S1, S2,202) being transferred to the receiver (104,207) of the system (100,200) of receiver (104,207) from transmitter (101,206), and receiver (104,207) comprising:
Adjustment unit (130) is used for adjusting the receiver transfer function of receiver (104,207) under transmitter (101,206) noise-limited condition, makes output signal (Sout) minimum of receiver (104,207);
Transmission unit (140) is used for adjusted receiver transfer function is sent to transmitter (101,206), makes transmitter (101,206) can its sender transfer functions be set to the inverse transformation of adjusted receiver transfer function.
9. a signal transmission system (100,200), comprise transmitter (101 according to claim 7,206), described transmitter is used for signal (S1, S2,202) be transferred to receiver according to claim 8 (104,207).
10. signal transmission system according to claim 9 (100,200), comprise signal channel (102,103), be used for signal (S1, S2,202) from transmitter (101,206) be transferred to receiver (104,207), and comprise transfer function transmission channel (106), be used for adjusted receiver transfer function from receiver (104,207) be sent to transmitter (101,206).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06077176.3 | 2006-11-24 | ||
| EP06077176 | 2006-11-24 | ||
| PCT/IB2007/054760 WO2008062380A2 (en) | 2006-11-24 | 2007-11-23 | Signal transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101542927A CN101542927A (en) | 2009-09-23 |
| CN101542927B true CN101542927B (en) | 2013-05-22 |
Family
ID=39365764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200780043497.3A Expired - Fee Related CN101542927B (en) | 2006-11-24 | 2007-11-23 | Signal transmission system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2087607A2 (en) |
| CN (1) | CN101542927B (en) |
| WO (1) | WO2008062380A2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101998452B (en) | 2009-08-25 | 2014-07-16 | 英派尔科技开发有限公司 | Calculating antenna performance |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5249200A (en) * | 1991-07-30 | 1993-09-28 | Codex Corporation | Device and method for combining precoding with symbol-rate spectral shaping |
| WO2005008911A1 (en) * | 2003-07-18 | 2005-01-27 | Philips Intellectual Property & Standards Gmbh | Method and device for reducing common mode signal in power line communication system |
| US8139759B2 (en) * | 2004-04-16 | 2012-03-20 | Panasonic Corporation | Line state detecting apparatus and transmitting apparatus and receiving apparatus of balanced transmission system |
-
2007
- 2007-11-23 CN CN200780043497.3A patent/CN101542927B/en not_active Expired - Fee Related
- 2007-11-23 EP EP20070849232 patent/EP2087607A2/en not_active Withdrawn
- 2007-11-23 WO PCT/IB2007/054760 patent/WO2008062380A2/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008062380A3 (en) | 2008-07-17 |
| CN101542927A (en) | 2009-09-23 |
| EP2087607A2 (en) | 2009-08-12 |
| WO2008062380A2 (en) | 2008-05-29 |
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