CN101494523A - Channel self-adapting method, device and system - Google Patents
Channel self-adapting method, device and system Download PDFInfo
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- CN101494523A CN101494523A CNA2008102475442A CN200810247544A CN101494523A CN 101494523 A CN101494523 A CN 101494523A CN A2008102475442 A CNA2008102475442 A CN A2008102475442A CN 200810247544 A CN200810247544 A CN 200810247544A CN 101494523 A CN101494523 A CN 101494523A
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Abstract
The embodiment of the invention discloses a channel self-adapting method, which comprises the following steps of: receiving a microwave high frequency signal transmitted by a transmitting terminal; carrying out processing to the microwave high frequency signal to obtain a channel indication signal; configurating own setting frequency according to the channel indication signal; and carrying out communication with the transmitting terminal according to the transmitting frequency of the transmitting terminal. The embodiment of the invention also discloses a channel self-adapting device and a system thereof and the invention is applicable to a receiving terminal which adapts the transmitting frequency of the transmitting terminal automatically.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of methods, devices and systems of channel self-adapting.
Background technology
ETC (Electronic Toll Collection, electric non-stop toll) system is a kind of automatic electronic charging system that is used for highway, bridge and tunnel that develops and promote of making great efforts in the world.The ETC system utilizes special-purpose short distance short-wave communication tedhnology, discerns vehicle automatically by the roadside unit (RSU) and the information exchange of board units (OBU), adopts electronic payment mode to finish the deduction of toll automatically.Adopt the ETC system, traffick needn't stop in charge station and pay dues and can pass through, thereby has increased the processing capacity of charge station.
In the ETC system, for fear of the co-channel interference of adjacent lane, adopt two channels usually, each channel has different uplink frequency and down-link frequencies.For example: the uplink frequency of first channel is 5790MHz, corresponding down-link frequencies 5830MHz; The uplink frequency of second channel is 5800MHz, corresponding down-link frequencies 5840MHz.Adjacent lane adopts different channel communications, and roadside unit has the fixing frequency that transmits and receives.Automobile and does not know the roadside unit in this track with which channel is communicated by letter with it when entering the lane in which the drivers should pay fees, therefore need board units to have the function of automatic adaptation roadside unit communication channel.
At present, the method that board units adapts to the roadside unit communication channel automatically is: roadside unit at first sends a prescription ripple wake-up signal, is used for waking up the board units in the dormancy, sends first available frame count certificate subsequently and comprises its channel information; Board units receive first available frame count according to the time, determine that by the lane information of analyzing roadside unit which channel this board units adopts communicate by letter with roadside unit, thus the function of realization channel self-adapting.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
Board units must receive first complete available frame count according to the time, just can know the communication channel of roadside unit, promptly channel self-adapting must rely on the information that radio frequency carries, rather than goes identification from radio frequency itself, so the speed of identification is slower; In addition, when relying on information that radio frequency carries and realizing channel self-adapting, board units receive first available frame count according to the time, be not distinguish channel, otherwise can't correctly receive information, be broadband reception, both first channel can be received, also second channel can be received.The roadside unit of different channels is suspended on the adjacent track in the practical application, can reveal mutually each other, so board units is subjected to the interference of adjacent channel easily.
Summary of the invention
Embodiments of the invention provide a kind of methods, devices and systems of channel self-adapting, can improve channel identification speed, effectively avoid the interference of adjacent channel.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of method of channel self-adapting comprises:
Receive the microwave high-frequency signals of transmitting terminal emission;
Described microwave high-frequency signals is handled, obtained the channel index signal;
According to described channel index signal, reconfigure the setpoint frequency of self, perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
A kind of device of channel self-adapting comprises:
Receiving element is used to receive the microwave high-frequency signals that transmitting terminal is launched;
Processing unit is used for described microwave high-frequency signals is handled, and obtains the channel index signal;
Selected cell is used for reconfiguring the setpoint frequency of self according to described channel index signal, and perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
A kind of system of channel self-adapting comprises transmitting terminal and receiving terminal,
Described transmitting terminal is used for the launched microwave high-frequency signal, communicates with the tranmitting frequency of described receiving terminal according to transmitting terminal;
Described receiving terminal, be used to receive the microwave high-frequency signals of described transmitting terminal emission, described microwave high-frequency signals is handled, obtain the channel index signal, according to described channel index signal, reconfigure the setpoint frequency of self, perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
The methods, devices and systems of the channel self-adapting that the embodiment of the invention provides, only need handle the microwave high-frequency signals of transmitting terminal emission, obtain the channel index signal, according to described channel index signal, self setpoint frequency is configured to corresponding, communicates according to the tranmitting frequency and the transmitting terminal of described transmitting terminal with the tranmitting frequency of described transmitting terminal.Compared with prior art, the present invention adopts the method for radio-frequency (RF) identification, as long as there is radiofrequency signal just can discern channel, channel identification and Data Receiving can be carried out simultaneously, have improved channel identification speed; In addition, described radio-frequency identification method is narrow-band reception, and narrow-band reception has very strong inhibitory action to the signal of adjacent channel, and receiving terminal can not produce response to the signal that adjacent channel is revealed, and has avoided the interference of adjacent channel effectively.
Description of drawings
The method flow diagram of the channel self-adapting that Fig. 1 provides for the embodiment of the invention one;
The method flow diagram of the channel self-adapting that Fig. 2 provides for the embodiment of the invention two;
The apparatus structure schematic diagram of the channel self-adapting that Fig. 3 provides for the embodiment of the invention three;
The apparatus structure schematic diagram of the channel self-adapting that Fig. 4 provides for the embodiment of the invention four;
The system configuration schematic diagram of the channel self-adapting that Fig. 5 provides for the embodiment of the invention five.
Embodiment
Embodiments of the invention provide a kind of methods, devices and systems of channel self-adapting.
For the advantage that makes technical solution of the present invention is clearer, the present invention is elaborated below in conjunction with drawings and Examples.
Embodiments of the invention provide a kind of method of channel self-adapting, can improve channel identification speed, effectively avoid the interference of adjacent channel.
Embodiment one
As shown in Figure 1, the method for described channel self-adapting comprises:
The microwave high-frequency signals of S101, the emission of reception transmitting terminal;
S102, described microwave high-frequency signals is handled, obtained the channel index signal;
S103, according to described channel index signal, reconfigure the setpoint frequency of self, perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
The method of the channel self-adapting that the embodiment of the invention provides, only need handle the microwave high-frequency signals of transmitting terminal emission, obtain the channel index signal, according to described channel index signal, self setpoint frequency is configured to corresponding, communicates according to the tranmitting frequency and the transmitting terminal of described transmitting terminal with the tranmitting frequency of described transmitting terminal.Compared with prior art, the present invention adopts the method for radio-frequency (RF) identification, as long as there is radiofrequency signal just can discern channel, channel identification and Data Receiving can be carried out simultaneously, have improved channel identification speed; In addition, described radio-frequency identification method is narrow-band reception, and narrow-band reception has very strong inhibitory action to the signal of adjacent channel, and receiving terminal can not produce response to the signal that adjacent channel is revealed, and has avoided the interference of adjacent channel effectively.
Embodiment two
The scene that present embodiment provides is an electronic charging system without parking, and described transmitting terminal is a roadside unit, and described receiving terminal is a board units.
As shown in Figure 2, the method for described channel self-adapting comprises:
The frequency that S201, board units receive the roadside unit emission is F
Send outMicrowave high-frequency signals, wherein, described each roadside unit may be launched two kinds of frequencies respectively and be respectively F
1And F
2Microwave high-frequency signals, i.e. F
Send outValue may be F
1Or F
2Described board units receives the receive frequency F of microwave high-frequency signals
ReceiveEqual the tranmitting frequency F of described roadside unit launched microwave high-frequency signal
Send out, the setpoint frequency F of described board units self
If=F
1, can certainly be made as F
If=F
2
S202, described microwave high-frequency signals is amplified the high-frequency signal after obtaining amplifying.
S203, convert the high-frequency signal after the described amplification to intermediate-freuqncy signal.
S204, described intermediate-freuqncy signal are sent to intermediate frequency amplifier circuit after through an intermediate-frequency filter, and described intermediate-frequency filter is a band pass filter, have only in the bandwidth range (near band pass filter centre frequency F
0) signal could pass through, the frequency of this signal is: F
Receive-F
If=F
In=F
0, other frequency signals are suppressed.So receive frequency F
ReceiveWith setpoint frequency F
IfDifference equal the intermediate-freuqncy signal of filter center frequency, will enter intermediate frequency amplifier and be exaggerated; Receive frequency F
ReceiveWith setpoint frequency F
IfThe difference intermediate-freuqncy signal that is not equal to the filter center frequency can not exported by intermediate-frequency filter, can not amplified by intermediate frequency amplifier yet.The narrow bandwidth that utilizes band pass filter is realized narrow-band reception by characteristic.
S205, with described near band pass filter centre frequency F
0Frequency signal amplify.
S206, the frequency signal after the described amplification is carried out intensity detection, obtain received signal intensity indication (RSSI, Receive signal strong indicate).
Tranmitting frequency F when the described roadside unit that receives
ReceiveSetpoint frequency F with described board units
IfHas F
Receive-F
If=F
In=F
0Corresponding relation the time, received signal intensity indication and F
ReceiveIntensity be directly proportional; Tranmitting frequency F when the described roadside unit that receives
ReceiveSetpoint frequency F with board units
IfThere is not F
Receive-F
If=F
In=F
0Corresponding relation the time, no matter F
ReceiveIntensity how to change, received signal intensity indication all is very low level.
S207, described received signal intensity indication RSSI and reference level are compared, obtain comparative result, described comparative result is the channel index signal.Described reference level has a relatively-stationary value, and is irrelevant with setpoint frequency, will exceed 50mv more generally speaking on the basis of RSSI noise level, and whether the tranmitting frequency that can stabilize decision go out to receive this moment is the frequency that needs.In the practical application, can also suitably heighten reference level value, when realizing that receive frequency is judged, can also guarantee to receive stronger frequency signal, realize the stability of communication.Because when there is output valve in RSSI, its output valve size is directly proportional with the intensity of the tranmitting frequency that receives, at this moment as required can be suitable heighten reference level, require the output valve of RSSI higher relatively like this, promptly require the signal strength signal intensity of reception enough strong, to guarantee the stability of communication.
The size of more described received signal intensity indication and reference level, if described received signal intensity is indicated greater than described reference level, then described channel index signal is a logic high; If described received signal intensity indication is less than described reference level, then described channel index signal is a logic low.
S208, according to described channel index signal, reconfigure the setpoint frequency F of self
If, perhaps according to the tranmitting frequency F of described roadside unit
Send outCommunicate with roadside unit.
If described channel index signal is a logic high, show the receive frequency F of board units
ReceiveWith setpoint frequency F
IfDifference equal the centre frequency F of intermediate-frequency filter
0, and then know the tranmitting frequency F of described roadside device
Send outBe F
1, show that both sides are using identical channel communication, then board units and roadside unit will be according to described frequency F
1As carrier wave, realize transmitting and receiving of data;
If described channel index signal is a logic low, show the receive frequency F of board units
ReceiveWith setpoint frequency F
IfDifference be not equal to the centre frequency F of intermediate-frequency filter
0, show that both sides are using different channel communications, then board units reconfigures the setpoint frequency F of self
0, be logic high up to described channel index signal.
Two setpoint frequency F are only enumerated in this enforcement
1Or F
2, also more multi-frequency can be arranged in the practical application, as long as dispose the setpoint frequency F of self one by one
If, when described channel index signal is a logic high, self the setpoint frequency F that promptly determines to be disposed
IfCorresponding receive frequency F
ReceiveBe the frequency that communicates with roadside device.
Thereby, utilize the method for the channel self-adapting that the embodiment of the invention provides, can improve channel identification speed, effectively avoid the interference of adjacent channel.
Embodiments of the invention provide a kind of device of channel self-adapting, can improve channel identification speed, effectively avoid the interference of adjacent channel.
Embodiment three
As shown in Figure 3, the device of described channel self-adapting comprises:
Receiving element 301 is used to receive the microwave high-frequency signals that transmitting terminal is launched;
Processing unit 302 is used for described microwave high-frequency signals is handled, and obtains the channel index signal;
Selected cell 303 is used for reconfiguring the setpoint frequency of self according to described channel index signal, and perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
The device of the channel self-adapting that the embodiment of the invention provides, only need handle the microwave high-frequency signals of transmitting terminal emission, obtain the channel index signal, according to described channel index signal, self setpoint frequency is configured to corresponding, communicates according to the tranmitting frequency and the transmitting terminal of described transmitting terminal with the tranmitting frequency of described transmitting terminal.Compared with prior art, the present invention adopts the method for radio-frequency (RF) identification, as long as there is radiofrequency signal just can discern channel, channel identification and Data Receiving can be carried out simultaneously, have improved channel identification speed; In addition, described radio-frequency identification method is narrow-band reception, and narrow-band reception has very strong inhibitory action to the signal of adjacent channel, and the device of described channel self-adapting can not produce response to the signal that adjacent channel is revealed, and has avoided the interference of adjacent channel effectively.
Embodiment four
As shown in Figure 4, the device of described channel self-adapting comprises:
Receiving element 401 is used to receive the microwave high-frequency signals that transmitting terminal is launched, and wherein, described transmitting terminal may be launched two kinds of frequencies and be respectively F
1And F
2Microwave high-frequency signals, i.e. F
Send outValue may be F
1Or F
2Described receiving element 401 receives the receive frequency F of microwave high-frequency signals
ReceiveBe the tranmitting frequency F of described transmitting terminal launched microwave high-frequency signal
Send out, the setpoint frequency F of the device of described channel self-adapting self
If=F
1, can certainly be made as F
If=F
2Two setpoint frequency F are only enumerated in this enforcement
1Or F
2, also can have more a plurality of frequencies in the practical application.
Wherein, described processing unit 402 comprises:
Wherein, described integrated transceiver 404 comprises:
Intermediate frequency amplifier 4043 is used for described intermediate-freuqncy signal is amplified.
Intensity detector 4044 is used for described amplified IF signal is carried out intensity detection, obtains the indication of received signal intensity, wherein, and as the tranmitting frequency F of the described transmitting terminal that receives
ReceiveSetpoint frequency F with the device of channel self-adapting
IfHas F
Receive-F
If=F
In=F
0Corresponding relation the time, received signal intensity indication and F
ReceiveIntensity be directly proportional; Tranmitting frequency F when the described transmitting terminal that receives
ReceiveSetpoint frequency F with the device of channel self-adapting
IfNot at once, no matter F
ReceiveIntensity how to change, received signal intensity indication all is very low level.
Wherein, described processing unit 403 also comprises:
Intermediate-frequency filter 406 is a band pass filter, has only in the bandwidth range (near band pass filter centre frequency F
0) signal could pass through, the frequency of this signal is: F
Receive-F
If=F
In=F
0, other frequency signals are suppressed, so it has the function of frequency-selecting.Intermediate-freuqncy signal after described frequency mixer 4042 conversions is sent to intermediate frequency amplifier 4043 through behind this intermediate-frequency filter 406.
Wherein, described selected cell 403 comprises:
Dispensing unit 4031 is used for reconfiguring the setpoint frequency of self when described channel index signal is logic low.If described channel index signal is a logic low, show the setpoint frequency F of the device of channel self-adapting
IfDo not constitute corresponding relation with the receive frequency of described microwave high-frequency signals, show that both sides are using different channel communications, then dispensing unit 4031 will reconfigure the setpoint frequency F of self
If, be logic high up to described channel index signal, in an embodiment of the present invention, described dispensing unit 4031 is the part of baseband controller.
The device of present embodiment channel self-adapting can be applied to electronic charging system without parking, and at this moment, described transmitting terminal is a roadside unit, and the device of described channel self-adapting is a board units.
Thereby, utilize the device of the channel self-adapting that the embodiment of the invention provides, can improve channel identification speed, effectively avoid the interference of adjacent channel.
Embodiments of the invention provide a kind of system of channel self-adapting, can improve channel identification speed, effectively avoid the interference of adjacent channel.
Embodiment five
As shown in Figure 5, the system of described channel self-adapting comprises transmitting terminal 501 and receiving terminal 502,
Described transmitting terminal 501 is used for the launched microwave high-frequency signal, communicates with the tranmitting frequency of described receiving terminal 502 according to transmitting terminal;
Described receiving terminal 502, be used to receive the microwave high-frequency signals of described transmitting terminal 501 emissions, described microwave high-frequency signals is handled, obtain the channel index signal, according to described channel index signal, reconfigure the setpoint frequency of self, perhaps tranmitting frequency and the transmitting terminal 501 according to described transmitting terminal 501 communicates.
In the present embodiment, described receiving terminal 502 is the device of channel self-adapting, and the specific implementation of described receiving terminal 502 and operation principle are referring to the associated description of the device of front channel self-adapting.
The system of the channel self-adapting that the embodiment of the invention provides, only need handle the microwave high-frequency signals of transmitting terminal emission, obtain the channel index signal, according to described channel index signal, self setpoint frequency is configured to corresponding, communicates according to the tranmitting frequency and the transmitting terminal of described transmitting terminal with the tranmitting frequency of described transmitting terminal.Compared with prior art, the present invention adopts the method for radio-frequency (RF) identification, as long as there is radiofrequency signal just can discern channel, channel identification and Data Receiving can be carried out simultaneously, have improved channel identification speed; In addition, described radio-frequency identification method is narrow-band reception, and narrow-band reception has very strong inhibitory action to the signal of adjacent channel, and receiving terminal can not produce response to the signal that adjacent channel is revealed, and has avoided the interference of adjacent channel effectively.
The system of described channel self-adapting can be electronic charging system without parking, and at this moment, described transmitting terminal 501 is a roadside unit, and described receiving terminal 502 is a board units.
Embodiments of the invention are applicable to and in the electronic charging system without parking with a plurality of communication channels channel are carried out self adaptation that certainly, technical scheme of the present invention also goes for other communication environments with a plurality of above communication channels.
The above; it only is the embodiment of the embodiment of the invention; but the protection range of the embodiment of the invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, the protection range of the embodiment of the invention should be as the criterion with the protection range of claim.
Claims (11)
1, a kind of method of channel self-adapting is characterized in that, comprising:
Receive the microwave high-frequency signals of transmitting terminal emission;
Described microwave high-frequency signals is handled, obtained the channel index signal;
According to described channel index signal, reconfigure the setpoint frequency of self, perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
2, the method for channel self-adapting according to claim 1 is characterized in that, described described microwave high-frequency signals is handled, and the step that obtains the channel index signal comprises:
Described microwave high-frequency signals is handled, obtained the indication of received signal intensity;
Described received signal intensity indication and reference level are compared, obtain comparative result, described comparative result is the channel index signal.
3, the method for channel self-adapting according to claim 2 is characterized in that, described described microwave high-frequency signals is handled, and the step that obtains the indication of received signal intensity comprises:
Described microwave high-frequency signals is amplified the high-frequency signal after obtaining amplifying;
Convert the high-frequency signal after the described amplification to intermediate-freuqncy signal;
From described intermediate-freuqncy signal, choose a frequency signal near the band pass filter centre frequency;
Described frequency signal near the band pass filter centre frequency is amplified;
Frequency signal after the described amplification is carried out intensity detection, obtain the indication of received signal intensity.
4, the method for channel self-adapting according to claim 2 is characterized in that, described indication of described received signal intensity and reference level is compared, and obtains comparative result, and described comparative result is that the step of channel index signal comprises:
The size of more described received signal intensity indication and reference level, if described received signal intensity is indicated greater than described reference level, then described channel index signal is a logic high;
If described received signal intensity indication is less than described reference level, then described channel index signal is a logic low.
5, the method for channel self-adapting according to claim 4 is characterized in that, and is described according to described channel index signal, reconfigures the setpoint frequency of self, and perhaps the step that communicates according to the tranmitting frequency and the transmitting terminal of described transmitting terminal comprises:
If described channel index signal is a logic high, show that the setpoint frequency of self and the receive frequency of described microwave high-frequency signals constitute corresponding relation, and then know the tranmitting frequency of described transmitting terminal, then tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates;
If described channel index signal is a logic low, show that then the setpoint frequency of self and the receive frequency of described microwave high-frequency signals do not constitute corresponding relation, then reconfigure the setpoint frequency of self, be logic high up to described channel index signal.
6, a kind of device of channel self-adapting is characterized in that, comprising:
Receiving element is used to receive the microwave high-frequency signals that transmitting terminal is launched;
Processing unit is used for described microwave high-frequency signals is handled, and obtains the channel index signal;
Selected cell is used for reconfiguring the setpoint frequency of self according to described channel index signal, and perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
7, the device of channel self-adapting according to claim 6 is characterized in that, described processing unit comprises:
Integrated transceiver is used for described microwave high-frequency signals is handled, and obtains the indication of received signal intensity;
Comparator is used for described received signal intensity indication and reference level are compared, and obtains comparative result, and described comparative result is the channel index signal.
8, the device of channel self-adapting according to claim 7 is characterized in that, described integrated transceiver comprises:
Low noise amplifier is used for described microwave high-frequency signals is amplified, the high-frequency signal after obtaining amplifying;
Frequency mixer is used for converting the high-frequency signal after the described amplification to intermediate-freuqncy signal;
Intermediate frequency amplifier is used for described intermediate-freuqncy signal is amplified;
Intensity detector is used for described amplified IF signal is carried out intensity detection, obtains the indication of received signal intensity;
Local oscillator is used to produce a stable frequency signal, and described setpoint frequency is a local frequency.
9, the device of channel self-adapting according to claim 8, described processing unit also comprises:
Intermediate-frequency filter, the intermediate-freuqncy signal that is used for after the conversion of described frequency mixer is chosen a frequency signal near the band pass filter centre frequency, and selected frequency signal is sent to intermediate frequency amplifier.
According to the device of claim 7,8 or 9 described channel self-adaptings, it is characterized in that 10, described selected cell comprises:
Dispensing unit is used for reconfiguring the setpoint frequency of self when described channel index signal is logic low;
Performance element is used for when described channel index signal is logic high, communicates according to the tranmitting frequency and the transmitting terminal of described transmitting terminal.
11, a kind of system of channel self-adapting comprises transmitting terminal and receiving terminal, it is characterized in that:
Described transmitting terminal is used for the launched microwave high-frequency signal, communicates with the tranmitting frequency of described receiving terminal according to transmitting terminal;
Described receiving terminal, be used to receive the microwave high-frequency signals of described transmitting terminal emission, described microwave high-frequency signals is handled, obtain the channel index signal, according to described channel index signal, reconfigure the setpoint frequency of self, perhaps tranmitting frequency and the transmitting terminal according to described transmitting terminal communicates.
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| CNA2008102475442A CN101494523A (en) | 2008-12-30 | 2008-12-30 | Channel self-adapting method, device and system |
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| CNA2008102475442A CN101494523A (en) | 2008-12-30 | 2008-12-30 | Channel self-adapting method, device and system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010148773A1 (en) * | 2009-12-03 | 2010-12-29 | 中兴通讯股份有限公司 | Realizing method and apparatus for avoiding adjacent-channel interference in electronic toll of collection (etc) system |
| CN102087757A (en) * | 2010-11-24 | 2011-06-08 | 深圳市金溢科技有限公司 | Signal downlink method and device of electronic toll collection road side unit |
| CN102542620A (en) * | 2011-12-27 | 2012-07-04 | 北京握奇数据系统有限公司 | Method, equipment and system for controlling signal transmission time sequence of road side equipment |
| CN102565758A (en) * | 2011-12-09 | 2012-07-11 | 北京握奇数据系统有限公司 | Positioning device and method for vehicle-mounted unit in ETC (Electronic Toll Collection) system |
| CN102915570A (en) * | 2011-08-05 | 2013-02-06 | 深圳市金溢科技有限公司 | Road side unit, broadband adaptive device and broadband adaptive method |
| CN111162817A (en) * | 2019-12-30 | 2020-05-15 | 航天信息股份有限公司 | Method for improving radio frequency dynamic range of OBU (on-board unit), radio frequency front end and OBU |
| WO2022077455A1 (en) * | 2020-10-16 | 2022-04-21 | 华为技术有限公司 | Communication method and apparatus |
-
2008
- 2008-12-30 CN CNA2008102475442A patent/CN101494523A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010148773A1 (en) * | 2009-12-03 | 2010-12-29 | 中兴通讯股份有限公司 | Realizing method and apparatus for avoiding adjacent-channel interference in electronic toll of collection (etc) system |
| CN102088705B (en) * | 2009-12-03 | 2015-05-13 | 中兴通讯股份有限公司 | Implementation method and system for avoiding adjacent channel interference in electronic toll of collection (ETC) |
| CN102087757A (en) * | 2010-11-24 | 2011-06-08 | 深圳市金溢科技有限公司 | Signal downlink method and device of electronic toll collection road side unit |
| CN102087757B (en) * | 2010-11-24 | 2012-11-28 | 深圳市金溢科技有限公司 | Signal downlink method and device of electronic toll collection road side unit |
| CN102915570A (en) * | 2011-08-05 | 2013-02-06 | 深圳市金溢科技有限公司 | Road side unit, broadband adaptive device and broadband adaptive method |
| CN102915570B (en) * | 2011-08-05 | 2015-11-11 | 深圳市金溢科技股份有限公司 | Roadside unit, wideband self-reacting device and wideband adaptive approach |
| CN102565758A (en) * | 2011-12-09 | 2012-07-11 | 北京握奇数据系统有限公司 | Positioning device and method for vehicle-mounted unit in ETC (Electronic Toll Collection) system |
| CN102542620A (en) * | 2011-12-27 | 2012-07-04 | 北京握奇数据系统有限公司 | Method, equipment and system for controlling signal transmission time sequence of road side equipment |
| CN102542620B (en) * | 2011-12-27 | 2014-03-26 | 北京握奇数据系统有限公司 | Method, equipment and system for controlling signal transmission time sequence of road side equipment |
| CN111162817A (en) * | 2019-12-30 | 2020-05-15 | 航天信息股份有限公司 | Method for improving radio frequency dynamic range of OBU (on-board unit), radio frequency front end and OBU |
| CN111162817B (en) * | 2019-12-30 | 2021-11-30 | 航天信息股份有限公司 | Method for improving radio frequency dynamic range of OBU (on-board unit), radio frequency front end and OBU |
| WO2022077455A1 (en) * | 2020-10-16 | 2022-04-21 | 华为技术有限公司 | Communication method and apparatus |
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Application publication date: 20090729 |