CN105763257A - High-speed rail communication system - Google Patents
High-speed rail communication system Download PDFInfo
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- CN105763257A CN105763257A CN201610262662.5A CN201610262662A CN105763257A CN 105763257 A CN105763257 A CN 105763257A CN 201610262662 A CN201610262662 A CN 201610262662A CN 105763257 A CN105763257 A CN 105763257A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
The invention provides a high-speed rail communication system which can increase a communication transmission rate and communication quality. The system comprises terminal equipment, visible light communication equipment, a gateway, a straight-through amplification system, a far-end antenna unit and a central station. The visible light communication equipment is used for modulating an electric signal sent by the terminal equipment and transmitting the modulated electric signal to the far-end antenna unit successively through the gateway and the straight-through amplification system. A radio frequency signal sent to the far-end antenna unit by the straight-through amplification system is a millimeter wave signal. Or the visible light communication equipment is also used for modulating and converting the electric signal sent by the terminal equipment into a first light signal. The first light signal is transmitted in a carriage. The far-end antenna unit is used for converting the received millimeter wave signal into a second light signal and sending the second light signal to the central station through an optical fiber. The far-end antenna unit is also used for receiving a third light signal sent by the central station through the optical fiber. The system is suitable for the optical communication technology field.
Description
Technical field
The present invention relates to technical field of photo communication, particularly relate to a kind of high ferro communication system.
Background technology
Along with developing rapidly of China Express Railway (be called for short: high ferro), high ferro mobile subscriber amount is gradually increased, and mobile subscriber thirsts for having higher network capacity, more reliable communication quality, faster network speed.Substantial amounts of experiment test shows, when communication technology under existing standard is applied to high ferro, four subject matters of existence all in various degree, namely transfer rate is low, switching frequency is high, communication quality is poor, particularly when the high ferro radio communication of densely populated place, communication quality is extremely undesirable.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high ferro communication system, to solve the problem that transfer rate is low, switching frequency is high, communication quality is poor existing for prior art.
For solving above-mentioned technical problem, the embodiment of the present invention provides a kind of high ferro communication system, including: terminal unit, visible light communication equipment, gateway, the straight-through amplification system of the described terminal device information of registration, remote antenna unit and central station；Wherein, described terminal unit passes sequentially through described visible light communication equipment, gateway, straight-through amplification system, remote antenna unit and described central station and is communicatively coupled, and described remote antenna unit is communicatively coupled by optical fiber and described central station；
Described visible light communication equipment, for the signal of telecommunication that described terminal unit sends is modulated, and the signal of telecommunication after modulation is passed sequentially through described gateway, straight-through amplification system transmission extremely described remote antenna unit, wherein, described straight-through amplification system is millimeter-wave signal to the radiofrequency signal that described remote antenna unit wireless sends；Or, it is additionally operable to modulate and be converted to the first optical signal by the signal of telecommunication that described terminal unit sends, wherein, described first optical signal transmits in compartment；
Described remote antenna unit, for the described millimeter-wave signal received is converted to the second optical signal, and is sent described second optical signal to described central station by described optical fiber；It is additionally operable to receive, by described optical fiber, the 3rd optical signal that described central station sends.
Further, each central station is communicatively coupled by optical fiber and several described remote antenna unit, and the quantity of the described remote antenna unit of each central station connection is identical.
Further, several remote antenna unit connected with same central station are parallel with high ferro train rail and equidistant arrangement is in the same side of high ferro train rail.
Further, described visible light communication equipment includes: visible light communication light source and visible ray transmitting terminal Multiple access modulation equipment, and wherein, described visible light communication light source is connected with described visible ray transmitting terminal Multiple access modulation equipment；
Described visible ray transmitting terminal Multiple access modulation equipment, the signal of telecommunication for described terminal unit is sent carries out multi-carrier modulation, and is sent by described visible light communication light source by the multi-carrier signal after modulation.
Further, described visible ray transmitting terminal Multiple access modulation equipment, the signal of telecommunication specifically for described terminal unit is sent carries out baseband modulation, and the output signal after baseband modulation is carried out multiple access code band spectrum modulation, signal after multiple access code band spectrum modulation is sequentially carried out serial to parallel conversion, preequalization, inverse fast Fourier transform, adds Cyclic Prefix, parallel serial conversion, digital-to-analogue conversion process, and are sent by described visible light communication light source by the signal after digital-to-analogue conversion.
Further, described terminal unit includes: photodetector and visible ray receiving terminal multiple access demodulation equipment；
Described photodetector, for receiving the first optical signal that described visible light communication equipment sends, and is converted to the signal of telecommunication by described first optical signal；
Described visible ray receiving terminal multiple access demodulation equipment, for being demodulated the signal of telecommunication that described photodetector converts to.
Further, described visible ray receiving terminal multiple access demodulation equipment, the signal of telecommunication specifically for described photodetector is converted to is sequentially carried out analog digital conversion, serial to parallel conversion, go Cyclic Prefix, fast Fourier transform, post-equalization, parallel serial conversion to process, and the output signal after processing is sequentially carried out multiple access code solution extends to base band demodulating.
Further, when carrying out multiple access code band spectrum modulation or multiple access code despreading, the multiple access code of employing is walsh code.
Further, the codeword table of described multiple access code is shown as Represent walsh sequence,Walsh sequenceMeet:
Wherein,<>represents inner product operation；* conjugate operation is represented；Represent the conjugation of the kth walsh code of i-th user；cj,kRepresent jth user's kth walsh code；M represents walsh sequenceCode length, the maximum number of users that the system that simultaneously also illustrates that is supported.
Further, described system also includes: core net, and each core net and several described central stations are communicatively coupled；
Described core net, is used for obtaining rds data, and sends the described rds data obtained to the central station being connected with described core net.
Having the beneficial effect that of the technique scheme of the present invention:
In such scheme, in compartment, the first optical signal is transmitted by visible light communication equipment, transmit the second optical signal and the 3rd optical signal as the transmission link between remote antenna unit and central station by optical fiber simultaneously, there is the feature of low-loss, big broadband, electromagnetism interference, disclosure satisfy that the requirement to communications speed and communication quality of the high ferro intensive user, and can significantly alleviate the problem that high ferro frequently switches in overlay area.
Accompanying drawing explanation
The structural representation one of the high ferro communication system that Fig. 1 provides for the embodiment of the present invention；
The structural representation two of the high ferro communication system that Fig. 2 provides for the embodiment of the present invention；
The Multiple access modulation of communication and multiple access demodulation schematic flow sheet in the compartment that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed to the problem that existing transfer rate is low, switching frequency is high, communication quality is poor, it is provided that a kind of high ferro communication system.
In the embodiment of the present invention, in order to be more fully understood that invention, first light carrier radio communication and visible ray radio communication are briefly described:
Light carrier radio communication (RadiooverFiber, ROF) it is the wireless access technology that combines with wireless millimeter wave technology of fiber optic communication, on the one hand, the total bandwidth being provided that under atmospheric window due to wireless millimeter wave, up to 135GHz, is expected to make high ferro passenger obtain such as the communication efficiency of home broadband access；On the other hand, ROF technology is possible not only to reduce system deployment cost, but also can significantly alleviate high ferro in overlay area frequent switching problem, improve communications speed and communication quality.
At present, the single-row high ferro of China is typically loaded with 500-1000 name passenger, for the message transmission rate needed for so many passengers with broadband wireless access at least at the 100Mbps-1Gbps order of magnitude.In order to reach required message transmission rate, visible ray radio communication (VisibleLightCommunication can be adopted, VLC) technology, described visible ray wireless communication technology is a kind of new technique utilizing visible LED light source to communicate, there is visible ray aboundresources, energy-saving safe, message capacity is big, tranmitting frequency is high, transfer rate is fast, without electromagnetic interference, need not the advantage such as wireless frequency spectrum mandate.Present high ferro has deployed visible LED illumination, it will be seen that light wireless communication is applied in high ferro communication, will fully meet the high ferro intensive user efficient access demand to communication.
Embodiment one
As shown in Figure 1, a kind of high ferro communication system that the embodiment of the present invention provides, including: terminal unit 11, visible light communication equipment 12, gateway 13 (GateWay, GW) the straight-through amplification system 14 (DirectAmplificationSystem of described terminal unit 11 information, is registered, DAS), remote antenna unit 15 (RemoteAntennaUnit, and central station 16 (CentralStation, CS) RAU)；Wherein, described terminal unit 11 passes sequentially through described visible light communication equipment 12, gateway 13, straight-through amplification system 14, remote antenna unit 15 and described central station 16 and is communicatively coupled, and described remote antenna unit 15 is communicatively coupled by optical fiber and described central station 16；
Described visible light communication equipment 12, for the signal of telecommunication that described terminal unit 11 sends is modulated, and the signal of telecommunication after modulation is passed sequentially through described gateway 13, straight-through amplification system 14 is transmitted to described remote antenna unit 15, wherein, described straight-through amplification system 14 is millimeter-wave signal to the radiofrequency signal of described remote antenna unit 15 wireless transmission；Or, it is additionally operable to the signal of telecommunication by described terminal unit 11 sends and modulates and be converted to the first optical signal, wherein, described first optical signal transmits in compartment；
Described remote antenna unit 15, for the described millimeter-wave signal received is converted to the second optical signal, and is sent described second optical signal to described central station 16 by described optical fiber；It is additionally operable to receive, by described optical fiber, the 3rd optical signal that described central station 16 sends.
High ferro communication system described in the embodiment of the present invention, in compartment, the first optical signal is transmitted by visible light communication equipment 12, transmit the second optical signal and the 3rd optical signal as the transmission link between remote antenna unit 15 and central station 16 by optical fiber simultaneously, there is the feature of low-loss, big broadband, electromagnetism interference, disclosure satisfy that the requirement to communications speed and communication quality of the high ferro intensive user, and can significantly alleviate the problem that high ferro frequently switches in overlay area.
In the embodiment of the present invention, in described first optical signal, the second optical signal, the 3rd optical signal, first, second, third without particular meaning, is intended merely to difference and sends the equipment of optical signal.
In the embodiment of the present invention, described visible light communication equipment 12, gateway 13 and straight-through amplification system 14 can form car Intranet；As shown in Figure 2, described visible light communication equipment 12 is positioned at compartment, when interior communicates, the signal of telecommunication that the described terminal unit 11 received sends can be modulated and be converted to the first optical signal and transmit in compartment by described visible light communication equipment 12, meets the illumination in compartment simultaneously；When terminal unit 11 sends message to the straight-through amplification system 14 being positioned at train exterior, the signal of telecommunication that described terminal unit 11 sends is modulated by described visible light communication equipment 12, and the signal of telecommunication after modulation is sent to described straight-through amplification system 14 by described gateway 13, meet the illumination in compartment simultaneously.
In the embodiment of the present invention, as shown in Figure 2, described gateway 13 is positioned at compartment, often can there be a GW in joint compartment, all of visible light communication equipment 12 in current compartment corresponding for a certain GW is collected by the GW in described current compartment, GW in different compartments is interconnected in car LAN, and concrete, described GW is responsible for the connection between visible light communication equipment 12 and the LAN in current compartment and protocol conversion.
In the embodiment of the present invention, as in figure 2 it is shown, described straight-through amplification system 14 is positioned at the top of train, in train, all GW are all connected to the described straight-through amplification system 14 at train top, and in compartment, all of terminal unit 11 collects in described DAS registration.So, terminal unit 11 all of in array carriage can be considered as a group user, this group user is communicated by described DAS and RAU, can greatly reduce handover number of times, also greatly reduce the penetration loss that signal causes through totally enclosed type body construction and employing metal coating glass car body simultaneously.
In the embodiment of the present invention, described central station 16 and remote antenna unit 15 can form the outer Access Network of car, and based on ROF technology, described central station 16 and remote antenna unit 15 are disposed, reach low-power consumption, low cost, bandwidth purpose high, that easily install, concrete, each central station 16 is communicatively coupled by optical fiber and several described remote antenna unit 15, and the quantity of the described remote antenna unit 15 of each central station 16 connection is identical.Meanwhile, connect with same central station 16 several remote antenna unit 15 are parallel with high ferro train rail and equidistant arrangement is in the same side of high ferro train rail.
In the embodiment of the present invention, described straight-through amplification system 14 sends signal by wireless to described remote antenna unit 15, is radiofrequency signal by the signal being wirelessly transferred, and described radiofrequency signal is millimeter-wave signal.
In the embodiment of the present invention, described remote antenna unit 15, for for up-link, collect the straight-through amplification system 14 millimeter wave (namely wave band the belongs to a millimeter magnitude) signal by wireless transmission on train, and after electrical/optical (E/O) conversion layer in described remote antenna unit 15 is converted to the second optical signal, then incoming fiber optic mails to central station 16；For downlink, it is possible to filter out the 3rd optical signal from the signal come along fiber-optic transfer that central station 16 sends.
In the embodiment of the present invention, up-link refers to that signal sends to described visible light communication equipment 12, gateway 13, straight-through amplification system 14, remote antenna unit 15 and the transmission of central station 16 direction from terminal unit 11, and downlink refers to that signal is transmitted to terminal unit 11 by described central station 16, remote antenna unit 15, straight-through amplification system 14, gateway 13, visible light communication equipment 12.
In the embodiment of the present invention, described central station 16, it is furnished with powerful central control system, the signal of multiple remote antenna unit 15 can be processed by each central station 16, for instance, modulation, demodulation, signal synchronization, multiplexing, Radio Resource distribution etc..
In the embodiment of the present invention, described visible light communication equipment 12 includes: visible light communication light source and visible ray transmitting terminal Multiple access modulation equipment, and wherein, described visible light communication light source is connected with described visible ray transmitting terminal Multiple access modulation equipment；Described visible light communication light source can be light emitting diode (LightEmittingDiode, LED) light source, and described LED light source can be placed in the top often arranging passenger-seat, and each LED light source can support that multiple user carries out network service.
In the embodiment of the present invention, (described user refers to: terminal unit 11 often to arrange the user on seat in high-iron carriage, each terminal unit 11 represents a user) can be communicated by a LED light source, a LED light source can support that 2 to 4 users carry out network service simultaneously.
In the embodiment of the present invention, described visible ray transmitting terminal Multiple access modulation equipment, the signal of telecommunication for described terminal unit 11 is sent carries out multi-carrier modulation, and is sent by described visible light communication light source by the multi-carrier signal after modulation.So, in compartment, adopt the multi-carrier modulation technology of VLC, it is achieved that energy-saving safe in compartment, feature without electromagnetic interference, and ensure the demand that high ferro user is big to message capacity, transfer rate is fast.
In the detailed description of the invention of aforementioned high ferro communication system, further, described visible ray transmitting terminal Multiple access modulation equipment, the signal of telecommunication specifically for described terminal unit 11 is sent carries out baseband modulation, and the output signal after baseband modulation is carried out multiple access code band spectrum modulation, signal after multiple access code band spectrum modulation is sequentially carried out serial to parallel conversion, preequalization, inverse fast Fourier transform, adds Cyclic Prefix, parallel serial conversion, digital-to-analogue conversion process, and are sent by described visible light communication light source by the signal after digital-to-analogue conversion.
In the embodiment of the present invention, the concrete steps adopting the multi-carrier modulation technology of VLC in compartment include: first, the signal of telecommunication that described terminal unit 11 is sent carries out baseband modulation, characteristic with adaptive channel, it is easy to transmission, and the output signal addition multiple access code after baseband modulation is carried out multiple access code band spectrum modulation to be distinguished into different terminal unit 11 signals；Secondly, the multiple user signals of the serial of output after multiple access code band spectrum modulation is sequentially carried out serial to parallel conversion and pre-equalization process, it is possible to reduce or eliminate intersymbol interference, thus improving transmission performance and the service quality of channel；Carry out inverse fast Fourier transform (IFFT) again, add Cyclic Prefix, the conversion of parallel serial conversion, data converter, to complete multi-carrier modulation, improve transfer rate, finally, the multi-carrier signal after digital-to-analogue conversion is sent by described visible light communication light source.
In the embodiment of the present invention, for interior communication, multi-carrier signal after digital-to-analogue conversion is sent by described visible light communication light source, specifically include: the multi-carrier signal after digital-to-analogue conversion is undertaken after electro-optic conversion is the first optical signal by described visible light communication light source, sent by indoor visible light communication channel, wherein, described indoor visible light communication channel is the channel with Gaussian distribution feature, as shown in Figure 3.
In the detailed description of the invention of aforementioned high ferro communication system, further, described terminal unit 11 includes: photodetector and visible ray receiving terminal multiple access demodulation equipment；
Described photodetector, for receiving the first optical signal that described visible light communication equipment 12 sends, and is converted to the signal of telecommunication by described first optical signal；
Described visible ray receiving terminal multiple access demodulation equipment, for being demodulated the signal of telecommunication that described photodetector converts to.
In the embodiment of the present invention, described photodetector and visible ray receiving terminal multiple access demodulation equipment are positioned on terminal unit 11, say, that have how many terminal units 11 just to have how many photodetectors and visible ray receiving terminal multiple access demodulation equipment；Wherein, described visible ray receiving terminal multiple access demodulation equipment is communicatively coupled by the LED light source in described photodetector and described visible light communication equipment 12, the optical signal that each terminal unit 11 can receive 1 simultaneously or multiple LED light source sends.
In the detailed description of the invention of aforementioned high ferro communication system, further, described visible ray receiving terminal multiple access demodulation equipment, the signal of telecommunication specifically for described photodetector is converted to is sequentially carried out analog digital conversion, serial to parallel conversion, go Cyclic Prefix, fast Fourier transform, post-equalization, parallel serial conversion to process, and the output signal after processing is sequentially carried out multiple access code solution extends to base band demodulating.
In the embodiment of the present invention, for interior communication, as shown in Figure 3, it is possible to receive, by described photodetector, the first optical signal that the visible light communication light source in described visible light communication equipment 12 sends, and described first optical signal is converted to the signal of telecommunication；And by described visible ray receiving terminal multiple access demodulation equipment, the signal of telecommunication that described photodetector converts to is sequentially carried out analog digital conversion, serial to parallel conversion, goes Cyclic Prefix, fast Fourier transform (FFT), post-equalization, parallel serial conversion to process, can reduce or eliminate intersymbol interference, thus improving transmission performance and the service quality of channel；The series signals of output after being processed by parallel serial conversion again is sequentially carried out multiple access code solution and extends to base band demodulating, restores signal completing multicarrier demodulation.
In the detailed description of the invention of aforementioned high ferro communication system, further, when carrying out multiple access code band spectrum modulation or multiple access code despreading, the multiple access code of employing is walsh code.
In the embodiment of the present invention, when carrying out multiple access code band spectrum modulation or multiple access code despreading, the multiple access code of employing can be walsh code (Wlash), definitely orthogonal to ensure between code with code, eliminates inter-user interference, improves multiplexing efficiency.
In the detailed description of the invention of aforementioned high ferro communication system, further, the codeword table of described multiple access code is shown as Represent walsh sequence,Walsh sequenceMeet:
Wherein,<>represents inner product operation；* conjugate operation is represented；Represent the conjugation of the kth walsh code of i-th user；cj,kRepresent jth user's kth walsh code；M represents walsh sequenceCode length, the maximum number of users that the system that simultaneously also illustrates that is supported.
In the embodiment of the present invention, in order to support that a light source meets the communication requirement of multi-user, use the code word of multiple access technique design multiple access code, it is possible to the codeword table of described multiple access code be shown asWherein,Represent walsh sequence,Walsh sequenceMeet:
In formula (1),<>represents inner product operation；* conjugate operation is represented；Represent the conjugation of the kth walsh code of i-th user；cj,kRepresent jth user's kth walsh code；M represents walsh sequenceCode length, the maximum number of users that the system that simultaneously also illustrates that is supported.
In the embodiment of the present invention, at transmitting terminal, in described visible ray transmitting terminal Multiple access modulation equipment, the signal that user is sent by addition multiple access code through type (2) carries out multiple access code band spectrum modulation:
xn,k=s1,nc1,k+s2,nc2,k+…+sm,ncm,k,(1≤m≤M)(2)
In formula (2), si,nN-th signal of expression i-th user, i=1,2 ..., m；M is the number of user, c in systemi,kExpression jth user's kth Wlash code, i=1,2 ..., m；xn,kIt it is the signal after the n-th signal spread-spectrum of kth chip；M represents walsh sequenceCode length, the maximum number of users that the system that simultaneously also illustrates that is supported.
After in the embodiment of the present invention, the signal after multiple access code band spectrum modulation is sequentially carried out serial to parallel conversion, preequalization, inverse fast Fourier transform, adds Cyclic Prefix, parallel serial conversion, digital-to-analogue conversion process, sent by LED light source.
In the embodiment of the present invention, at receiving terminal, the signal r that described visible ray receiving terminal multiple access demodulation equipment receivesj,n,kCan be expressed as: rj,n,k=yj,n,k+nj,n,k；Wherein, rj,n,kRepresent the n-th signal after the kth chip spread spectrum that jth channel receives, yj,n,kRepresent the n-th signal after the kth chip spread spectrum that the LED light source that jth channel receives exports, nj,n,kRepresent the noise in the n-th signal after the kth chip spread spectrum of j-th strip channel.
In the embodiment of the present invention, in described visible ray receiving terminal multiple access demodulation equipment, add multiple access code, the through type (3) r to receivingj,n,kDe-spread so that multiple users carry out signal distinguishing and acquisition by the code word of different multiple access codes:
In formula (3),Representing the signal after the n-th signal despreading of jth user, M is the maximum number of users that system is supported, m is the quantity of user, c in systemj,kRepresent jth user's kth Wlash code, si,nRepresent n-th signal of i-th user, ci,kRepresent i-th user's kth Wlash code, vj,n,kIt it is noise in the n-th signal after jth channel kth chip spread spectrum after post-equalization.
In the detailed description of the invention of aforementioned high ferro communication system, further, described system also includes: core net, and each core net and several described central stations 16 are communicatively coupled；
Described core net, is used for obtaining rds data, and sends the described rds data obtained to the central station 16 being connected with described core net.
In the embodiment of the present invention, as in figure 2 it is shown, described system also includes: core net (CoreNetwork, CN), being constituted high ferro communication network by described car Intranet, the outer Access Network of car and core net, wherein, each core net and several described central stations 16 are communicatively coupled；The node of described core net can be arranged at the communications equipment room at the railway top grade station of Ge great Railway Bureau subordinate, and described communications equipment room includes: the equipment such as router, switch.Described core net, primary responsibility is to obtaining different kinds of railways data, and is analyzed processing and being forwarded to the central station 16 being connected with described core net to the rds data obtained.
The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from principle of the present invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a high ferro communication system, it is characterised in that including: terminal unit, visible light communication equipment, gateway, the straight-through amplification system of the described terminal device information of registration, remote antenna unit and central station；Wherein, described terminal unit passes sequentially through described visible light communication equipment, gateway, straight-through amplification system, remote antenna unit and described central station and is communicatively coupled, and described remote antenna unit is communicatively coupled by optical fiber and described central station；
Described visible light communication equipment, for the signal of telecommunication that described terminal unit sends is modulated, and the signal of telecommunication after modulation is passed sequentially through described gateway, straight-through amplification system transmission extremely described remote antenna unit, wherein, described straight-through amplification system is millimeter-wave signal to the radiofrequency signal that described remote antenna unit wireless sends；Or, it is additionally operable to modulate and be converted to the first optical signal by the signal of telecommunication that described terminal unit sends, wherein, described first optical signal transmits in compartment；
Described remote antenna unit, for the described millimeter-wave signal received is converted to the second optical signal, and is sent described second optical signal to described central station by described optical fiber；It is additionally operable to receive, by described optical fiber, the 3rd optical signal that described central station sends.
2. high ferro communication system according to claim 1, it is characterised in that each central station is communicatively coupled by optical fiber and several described remote antenna unit, and the quantity of the described remote antenna unit of each central station connection is identical.
3. high ferro communication system according to claim 2, it is characterised in that several remote antenna unit connected with same central station are parallel with high ferro train rail and equidistant arrangement is in the same side of high ferro train rail.
4. high ferro communication system according to claim 1, it is characterized in that, described visible light communication equipment includes: visible light communication light source and visible ray transmitting terminal Multiple access modulation equipment, and wherein, described visible light communication light source is connected with described visible ray transmitting terminal Multiple access modulation equipment；
Described visible ray transmitting terminal Multiple access modulation equipment, the signal of telecommunication for described terminal unit is sent carries out multi-carrier modulation, and is sent by described visible light communication light source by the multi-carrier signal after modulation.
5. high ferro communication system according to claim 4, it is characterized in that, described visible ray transmitting terminal Multiple access modulation equipment, the signal of telecommunication specifically for described terminal unit is sent carries out baseband modulation, and the output signal after baseband modulation is carried out multiple access code band spectrum modulation, signal after multiple access code band spectrum modulation is sequentially carried out serial to parallel conversion, preequalization, inverse fast Fourier transform, adds Cyclic Prefix, parallel serial conversion, digital-to-analogue conversion process, and are sent by described visible light communication light source by the signal after digital-to-analogue conversion.
6. high ferro communication system according to claim 1, it is characterised in that described terminal unit includes: photodetector and visible ray receiving terminal multiple access demodulation equipment；
Described photodetector, for receiving the first optical signal that described visible light communication equipment sends, and is converted to the signal of telecommunication by described first optical signal；
Described visible ray receiving terminal multiple access demodulation equipment, for being demodulated the signal of telecommunication that described photodetector converts to.
7. high ferro communication system according to claim 6, it is characterized in that, described visible ray receiving terminal multiple access demodulation equipment, the signal of telecommunication specifically for described photodetector is converted to is sequentially carried out analog digital conversion, serial to parallel conversion, go Cyclic Prefix, fast Fourier transform, post-equalization, parallel serial conversion to process, and the output signal after processing is sequentially carried out multiple access code solution extends to base band demodulating.
8. the high ferro communication system according to claim 5 or 7, it is characterised in that when carrying out multiple access code band spectrum modulation or multiple access code despreading, the multiple access code of employing is walsh code.
9. high ferro communication system according to claim 8, it is characterised in that the codeword table of described multiple access code is shown as Represent walsh sequence,Walsh sequenceMeet:
Wherein,<>represents inner product operation；* conjugate operation is represented；Represent the conjugation of the kth walsh code of i-th user；cj,kRepresent jth user's kth walsh code；M represents walsh sequenceCode length, the maximum number of users that the system that simultaneously also illustrates that is supported.
10. high ferro communication system according to claim 1, it is characterised in that described system also includes: core net, each core net and several described central stations are communicatively coupled；
Described core net, is used for obtaining rds data, and sends the described rds data obtained to the central station being connected with described core net.
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| CN106888467A (en) * | 2017-02-20 | 2017-06-23 | 电子科技大学 | A kind of high ferro WIFI systems based on millimeter wave |
| CN107147445A (en) * | 2017-05-10 | 2017-09-08 | 北京科技大学 | A kind of VISIBLE LIGHT SYSTEM multi-user communication method |
| CN107528610A (en) * | 2017-10-20 | 2017-12-29 | 北京凤凰汇通科技有限公司 | Wireless signal transceiver and wireless signal transmitting-receiving chain |
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| CN110771267A (en) * | 2017-05-31 | 2020-02-07 | 欧司朗有限责任公司 | Wireless data transmission between a communication terminal located in a predetermined area and a communication partner station |
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| CN107528610A (en) * | 2017-10-20 | 2017-12-29 | 北京凤凰汇通科技有限公司 | Wireless signal transceiver and wireless signal transmitting-receiving chain |
| CN107708225A (en) * | 2017-10-25 | 2018-02-16 | 西南交通大学 | A kind of quick optical wavelength switching method towards high-speed railway broadband wireless communications |
| CN107708225B (en) * | 2017-10-25 | 2020-12-18 | 西南交通大学 | Rapid optical wavelength switching method for high-speed railway broadband wireless communication |
| CN110247680A (en) * | 2019-06-05 | 2019-09-17 | 广东工业大学 | A kind of novel high-speed rail communication system based on power-line carrier communication |
| RU2776672C2 (en) * | 2019-06-05 | 2022-07-22 | Гуандун Юниверсити оф Текнолоджи | Communication system for high-speed railways based on technology of power line communication |
| CN110429979A (en) * | 2019-06-21 | 2019-11-08 | 南方科技大学 | Data transmission method, device, equipment and storage medium |
| CN113259945A (en) * | 2020-02-11 | 2021-08-13 | 武汉邮电科学研究院有限公司 | 6G photonics construction deployment of multiple wave bands of 6G network floodlight communication architecture |
| CN111918413A (en) * | 2020-06-24 | 2020-11-10 | 徐州智谷光频产业研究院有限公司 | Communication data link establishing system between connected train carriages |
| CN111918413B (en) * | 2020-06-24 | 2022-07-22 | 徐州智谷光频产业研究院有限公司 | System for establishing communication data link between train carriages connected with train |
| CN113346951A (en) * | 2021-06-01 | 2021-09-03 | 西南交通大学 | Method and system for optical wireless fusion of high-speed flying train and train in vacuum pipeline |
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