CN105071860B - A kind of multichannel ROF system based on WDM and OFDM technology - Google Patents
A kind of multichannel ROF system based on WDM and OFDM technology Download PDFInfo
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Abstract
The invention discloses a kind of multichannel ROF system based on WDM and OFDM technology, include successively from local side to service terminal：For realizing the local side apparatus ROFCS that local side business platform data are changed to multicarrier radio frequency optical signal, for the local side WDM modules for handling multicarrier radio frequency optical signal multiplex, trunk optical fiber for transmitting multiplex signal, for the distal end WDM modules for handling multiplex signal partial wave, for signal after partial wave to be carried out into opto-electronic conversion, the shift frequency of multicarrier radiofrequency signal and microwave and the remote antenna unit R AU and antenna launched, for receiving microwave signal and realizing the outdoor data unit ODU and antenna of microwave and multicarrier intermediate-freuqncy signal shift frequency, and for realizing the broadband services unit B TU that multicarrier intermediate-freuqncy signal is changed with Ethernet data.The problem of fiber entering household is difficult can be solved by way of wireless access the system；OFDM technology solves covering problem of the single wireless frequency in the multi-user in a region；Wavelength-division multiplex technique solves user's covering problem in multiple regions.
Description
Technical field
The present invention relates to fiber optic communication and wireless communication technology field, more particularly to it is a kind of based on WDM and OFDM technology
Multichannel ROF system, ROF (the Radio over of channel wireless radio multi and fiber mix access are realized especially with OFDM technology
Fiber light carries radio frequency) system.
Background technology
Current major operators are building FTTH (Fiber To The Home, fiber to the home) network energetically, but for portion
Region-by-region, portions of client, due to the limitation of the limitation either policy of environment, still suffer from some optical fiber deploy troops on garrison duty it is difficult, can not enter
The situation at family.
On the other hand, wireless high bandwidth access covering technology, such as TD-LTE, FDD-LTE, LMDS also in fast development, with
Radio frequency resources it is more rare, and progressively to more than 10GHz microwave frequency bands extend extend.Microwave frequency band wireless access has
Available frequency bandwidth, the characteristics of message transmission rate is high.Therefore, based on the nervous present situation of low-frequency range frequency resource, high band is added
The expection of the data transfer of Large Copacity, is just drive wireless access and is being strided forward to up to 60GHz millimeter wave.
In this case, the mode that be considered as wirelessly accessing with fiber mix is needed badly to solve prior art to exist
The problem of.
The content of the invention
In order to overcome the shortcomings of above-mentioned technology, the present invention proposes a kind of multichannel ROF systems based on WDM and OFDM technology
System.The problem of fiber entering household is difficult can be solved by way of wireless access the system.
For up to this purpose, the present invention uses following technical scheme：
A kind of multichannel ROF system based on WDM and OFDM technology, includes successively from local side to service terminal：For reality
The local side apparatus ROFCS that current situation end business platform data are changed to multicarrier radio frequency optical signal, for local side apparatus ROFCS is defeated
The multicarrier radio frequency optical signal gone out carries out the local side WDM modules of multiplex processing, and the trunk optical fiber for transmitting multiplex signal is used for
Multiplex signal in trunk optical fiber is carried out to the distal end WDM modules of partial wave processing, for the multicarrier radio frequency light after partial wave to be believed
Number carry out photosignal conversion, multicarrier radiofrequency signal and microwave between shift frequency, filter amplifying processing and complete transmitting
Remote antenna unit R AU and antenna, for receiving microwave signal and realizing the shift frequency between microwave and multicarrier intermediate-freuqncy signal, filter
The outdoor data unit ODU and antenna of ripple enhanced processing, and for realizing between multicarrier intermediate-freuqncy signal and Ethernet data
The broadband services unit B TU of conversion；
Wherein, the local side apparatus ROFCS by jumping fiber connect panel on light carry radio frequency interface after with local side WDM modules
Connection, the local side WDM modules are connected by trunk optical fiber with distal end WDM modules, and the distal end WDM modules are by jumping fiber and far
Hold antenna element RAU and antenna connection, the remote antenna unit R AU and antenna by microwave and outdoor data unit ODU and
Antenna communication, the outdoor data unit ODU and antenna are connected by coaxial cable with broadband services unit B TU.
Wherein, the local side apparatus ROFCS, including：Put down for completing distinct interface speed, the business of distinct interface form
Number of units is exchanged and managed for completing the multichannel of Fast Ethernet data according to the first line of a couplet module for arriving backboard Fast Ethernet data adaptation
The main control module of reason, and for realizing conversion between multichannel Ethernet data and multicarrier radiofrequency signal and for reality
The MROF modules of existing conversion between multicarrier radiofrequency signal and multicarrier radio frequency optical signal；
Wherein, the first line of a couplet module, each MROF module are connected by backboard high speed data bus with main control module；Institute
State local side apparatus ROFCS and the extraneous local side network equipment is connected to by its internal first line of a couplet module；
Wherein, the local side network equipment, including voice traffic services device, video traffic server, data service route
Device；The local side apparatus ROFCS supports multiple MROF modules simultaneously.
Wherein, the MROF modules, including：Switching Module, management module, OFDM modules, radio frequency processing module, photoelectricity turn
Change the mold block；
The local side business platform data pass through Switching Module, OFDM modules, radio frequency processing module, the photoelectricity being sequentially connected
After modular converter export multicarrier radio frequency optical signal, the management module respectively with Switching Module, OFDM modules, radio frequency processing mould
Block, photoelectric conversion module connection.
Wherein, the multicarrier radio frequency light letter for the different wave length that the local side WDM modules export local side difference MROF modules
Number multiplex processing is carried out, pass through the trunk optical fiber and transmit.
Wherein, the remote antenna unit R AU and antenna, including：For realizing photoelectric signal transformation, multicarrier radio frequency letter
Number to microwave shift frequency, filter, amplify and complete the first downstream units of transmitting and received for realizing and complete microwave and arrive
Shift frequency, filtering and the first upstream cell of electro-optical signal conversion of multicarrier radiofrequency signal；
First downstream units, include successively：Photoelectric conversion module, up-converter module, the first filtration module, amplification mould
Block and antenna；First upstream cell, includes successively：Antenna, down conversion module, the second filtration module and electro-optic conversion list
Member.
Wherein, the outdoor data unit ODU and antenna, including：For receiving microwave signal and realizing microwave to overloading
The shift frequency of ripple intermediate-freuqncy signal, the second downstream units of filtering and for realize multicarrier intermediate-freuqncy signal to microwave shift frequency, filter
Ripple, the second upstream cell amplified and launched；
Second downstream units, include successively：Antenna, down conversion module and the first filtration module；Described second is up
Unit, includes successively：Up-converter module, the second filtration module, amplification module and antenna.
Wherein, the remote antenna unit R AU and antenna simultaneously with multiple the outdoor data unit ODU and antenna
Communicated, and each described outdoor data unit ODU and antenna use identical microwave frequency.
Wherein, the broadband services unit B TU, including：IF process module, OFDM modules, Switching Module, business interface
Module and management module；
The multicarrier intermediate-freuqncy signal that the outdoor data unit ODU and antenna are produced passes through the IF process mould being sequentially connected
Outgoing traffic data after block, OFDM modules, Switching Module, business interface module, the management module respectively with IF process mould
Block, OFDM modules, Switching Module, the connection of business interface module.
Wherein, the distal end WDM modules are by multiple wavelength signals on the trunk optical fiber after partial wave is handled, and its is every
The signal of individual wavelength connects a remote antenna unit R AU and antenna by a jumping fiber；
Each remote antenna unit R AU and antenna wireless covering is no more than 8 outdoor data unit ODU and antenna；
Each the outdoor data unit ODU and antenna connect a broadband services unit B TU by coaxial cable；Each broadband
Business unit BTU includes 2 speech interfaces and 4 Ethernet interfaces, wherein, the speech interface is used to connect subsets
Speech business is accessed, the too network interface is used for access band data, video traffic and connection family gateway equipment.
The present invention proposes to be based on WDM (Wavelength Division Multiplexing, wavelength-division multiplex) and OFDM
The multichannel ROF of (Orthogonal Frequency Division Multiplexing, OFDM) technology
(radio-over-fiber, light carrier radio communication) system, mainly includes local side apparatus ROFCS (ROF Central
Station), local side WDM modules, trunk optical fiber, distal end WDM modules, remote antenna unit R AU (Remote Antenna
) and antenna, outdoor data unit ODU (Outdoor Data Unit) and antenna, broadband services unit B TU Unit
(Broadband Traffic Unit)。
Beneficial effect：
A kind of multichannel ROF system based on WDM and OFDM technology of the present invention, from local side to service terminal successively
Including：For realizing the local side apparatus ROFCS that local side business platform data are changed to multicarrier radio frequency optical signal, for by local side
The multicarrier radio frequency optical signal of equipment ROFCS outputs carries out the local side WDM modules of multiplex processing, the master for transmitting multiplex signal
Dry optical fiber, the distal end WDM modules for the multiplex signal in trunk optical fiber to be carried out to partial wave processing, for by the overloading after partial wave
Shift frequency, filter amplifying processing between conversion, multicarrier radiofrequency signal and the microwave of ripple radio frequency optical signal progress photosignal are simultaneously
Complete the remote antenna unit R AU and antenna of transmitting, for receive microwave signal and realize microwave and multicarrier intermediate-freuqncy signal it
Between shift frequency, the outdoor data unit ODU and antenna of filter amplifying processing, and for realizing multicarrier intermediate-freuqncy signal and ether
The broadband services unit B TU changed between network data；Wherein, the local side apparatus ROFCS connects the light on panel by jumping fiber
It is connected after carrying radio frequency interface with local side WDM modules, the local side WDM modules are connected by trunk optical fiber with distal end WDM modules, institute
State distal end WDM modules to be connected with remote antenna unit R AU and antenna by jumping fiber, the remote antenna unit R AU and antenna lead to
Microwave and outdoor data unit ODU and antenna communication are crossed, the outdoor data unit ODU and antenna pass through coaxial cable and broadband
Business unit BTU connections.It can be seen that, due to the technical program in the stage of registering one's residence by the way of wireless access, therefore, be by this
System can solve the problem of fiber entering household is difficult with the mode of wireless access, and OFDM technology can solve single wireless frequency and exist
The covering problem of the multi-user in one region, WDM technology can solve user's covering problem in multiple regions.
Brief description of the drawings
Fig. 1 is a kind of knot for multichannel ROF system based on WDM and OFDM technology that the specific embodiment of the invention is provided
Structure schematic diagram.
Fig. 2 is the structure composition block diagram of MROF modules.
Fig. 3 is the structure composition block diagram of remote antenna unit R AU and antenna.
Fig. 4 is the structure composition block diagram of outdoor data unit ODU and antenna.
Fig. 5 is broadband services unit B TU structure composition block diagram.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
A kind of multichannel ROF system based on WDM and OFDM technology of the present invention, embodiments thereof is as follows：
Fig. 1 is a kind of knot for multichannel ROF system based on WDM and OFDM technology that the specific embodiment of the invention is provided
Structure schematic diagram.As shown in figure 1, a kind of multichannel ROF system based on WDM and OFDM technology of the present invention, from local side to
Service terminal includes successively：For realizing the local side apparatus that local side business platform data are changed to multicarrier radio frequency optical signal
ROFCS, the multicarrier radio frequency optical signal for local side apparatus ROFCS to be exported carries out the local side WDM modules of multiplex processing, is used for
The trunk optical fiber of multiplex signal is transmitted, the distal end WDM modules for the multiplex signal in trunk optical fiber to be carried out to partial wave processing are used
Shifting between conversion, multicarrier radiofrequency signal and the microwave that the multicarrier radio frequency optical signal after by partial wave carries out photosignal
Frequently, filter amplifying processing and complete transmitting remote antenna unit R AU and antenna, for receive microwave signal and realize microwave with
The outdoor data unit ODU and antenna of shift frequency, filter amplifying processing between multicarrier intermediate-freuqncy signal, and for realizing overloading
The broadband services unit B TU changed between ripple intermediate-freuqncy signal and Ethernet data；
Wherein, the local side apparatus ROFCS by jumping fiber connect panel on light carry radio frequency interface after with local side WDM modules
Connection, the local side WDM modules are connected by trunk optical fiber with distal end WDM modules, and the distal end WDM modules are by jumping fiber and far
Hold antenna element RAU and antenna connection, the remote antenna unit R AU and antenna by microwave and outdoor data unit ODU and
Antenna communication, the outdoor data unit ODU and antenna are connected by coaxial cable with broadband services unit B TU.
Due to the technical program in the stage of registering one's residence by the way of wireless access, therefore, can be with wireless by the system
The mode of access solves the problem of fiber entering household is difficult.The local side WDM modules used due to the technical program are by local side apparatus ROFCS
The multicarrier radio frequency optical signal of output carries out multiplex processing, and distal end WDM modules are by the conjunction in the trunk optical fiber for transmitting multiplex signal
Ripple signal carries out partial wave processing, it is seen then that the signal of communication in multiple regions can be passed through into a trunk light by using WDM technology
Fibre realizes transmission, solves user's covering problem in multiple regions.
In this programme, the local side apparatus ROFCS, including：For completing distinct interface speed, distinct interface form
Business platform data are to the first line of a couplet module of backboard Fast Ethernet data adaptation, the multichannel friendship for completing Fast Ethernet data
The main control module for changing and managing, and for realize conversion between multichannel Ethernet data and multicarrier radiofrequency signal and
MROF modules for realizing the conversion between multicarrier radiofrequency signal and multicarrier radio frequency optical signal；Wherein, the upper gang mould
Block, each MROF module are connected by backboard high speed data bus with main control module；The local side apparatus ROFCS passes through in it
The first line of a couplet module in portion is connected to the extraneous local side network equipment.The local side network equipment, including voice traffic services device, video industry
Business server, data service router；The local side apparatus ROFCS supports multiple MROF modules simultaneously.
It should be noted that because local side apparatus ROFCS can support multiple MROF modules simultaneously, so just having multiple many
Carrier radio frequency signal (while being also that light carries radiofrequency signal), because the output of each MROF module is to be loaded into light wave
On multicarrier radiofrequency signal, therefore, the signal that MROF modules are exported is referred to as multicarrier radio frequency optical signal.Due to each MROF
It is different that the light of module carries radiofrequency signal wavelength, it is possible to multiplex is carried out by local side WDM modules, to distal end WDM module partial waves.
Fig. 2 is the structure composition block diagram of MROF modules.As shown in Fig. 2 the MROF modules, including：Switching Module, management
Module, OFDM modules, radio frequency processing module, photoelectric conversion module；The local side business platform data pass through the friendship being sequentially connected
Change the mold and multicarrier radio frequency optical signal, the management module are exported after block, OFDM modules, radio frequency processing module, photoelectric conversion module
It is connected respectively with Switching Module, OFDM modules, radio frequency processing module, photoelectric conversion module.
Fig. 5 is broadband services unit B TU structure composition block diagram.As shown in figure 5, the broadband services unit B TU, bag
Include：IF process module, OFDM modules, Switching Module, business interface module and management module；The outdoor data unit ODU
And the multicarrier intermediate-freuqncy signal that antenna is produced connects by IF process module, OFDM modules, Switching Module, the business being sequentially connected
Outgoing traffic data after mouth mold block, the management module connects with IF process module, OFDM modules, Switching Module, business respectively
Mouth mold block is connected.
OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexi), be
MCM (Multi Carrier Modulation), one kind of multi-carrier modulation.OFDM main thoughts are：Break a channel into some
Orthogonal sub-channels, high-speed data signal are converted into parallel low speed sub-data flow, are modulated to and are passed on each of the sub-channels
It is defeated.Orthogonal signalling be able to can so be reduced mutually dry between subchannel by being separated in receiving terminal using correlation technique
Disturb.Be less than the correlation bandwidth of channel per the signal bandwidth on sub-channels, thus per sub-channels on can regard flatness as and decline
Fall, so as to eliminate intersymbol interference, and because the bandwidth of every sub-channels is only the sub-fraction of former channel width, letter
Trace equalization becomes relatively easy, and OFDM technology has the ability that signal is transmitted under noise jamming.OFDM technology by carrier wave not
A large amount of signals in same frequency are merged into single signal, so as to complete signal transmission.
OFDM technology is that MROF modules and broadband services unit B TU are jointly comprised.Data transfer direction is from MROF modules
It is descending to broadband services unit B TU, otherwise is up.The descending of MROF modules is output as multicarrier radio frequency optical signal, there is many
Individual carrier wave, this multi-carrier signal will be converted to multicarrier microwave signal by remote antenna unit R AU and antenna, by wireless
It is transferred to multiple outdoor data unit ODU and antenna, each outdoor data unit ODU and antenna are by this multicarrier microwave signal
Be converted to multicarrier intermediate-freuqncy signal and be given to broadband services unit B TU, thus each broadband services unit B TU receive be by
The multi-carrier signal of OFDM technology, but broadband services unit B TU can only extract corresponding one in multi-carrier signal
Information in carrier wave is converted to business data transmission to business interface.Conversely, each broadband services unit B TU up being output as
Single carrier intermediate-freuqncy signal, signal is converted to single carrier microwave signal by outdoor data unit ODU and antenna, is transferred to distal end day
All single carrier microwave signals are converted to single carrier radio frequency light letter by line unit R AU and antenna, remote antenna unit R AU and antenna
Number be given to MROF modules, thus MROF modules can receive multiple single carrier radio frequency optical signals, these single carriers at the same time because in
Heart frequency is different, does not result in interfere with each other in theory, then MROF modules will extract the information of each single carrier respectively, turns
It is changed to business datum and is given to corresponding business interface.But MROF modules receive multiple single carriers and can not possibly be ensured of receipts simultaneously
Arrive, be also impossible to not interfere with completely between different carrier waves, so broadband services unit B TU has a CDR (clock
Data recovery clock and data recoveries) module, by between MROF modules interaction, ceaselessly adjust broadband services list
First BTU launches the time point of carrier wave, it is ensured that the single-carrier signal of multiple broadband services unit B TU transmittings reaches MROF moulds simultaneously
Block, at utmost reduces the interference of intercarrier.It can be seen that, this programme can solve single wireless frequency by using OFDM technology and exist
The covering problem of the multi-user in one region.
The multicarrier radio frequency optical signal for the different wave length that the local side WDM modules export local side difference MROF modules is carried out
Multiplex processing, is transmitted by a trunk optical fiber.
Fig. 3 is the structure composition block diagram of remote antenna unit R AU and antenna.As shown in figure 3, the remote antenna unit
RAU and antenna, including：For realize photoelectric signal transformation, the shift frequency of multicarrier radiofrequency signal to microwave, filtering, amplification and it is complete
Into the first downstream units of transmitting and for realizing reception and completing microwave to the shift frequency of multicarrier radiofrequency signal, filtering and electricity
First upstream cell of optical signal conversion；
First downstream units, include successively：Photoelectric conversion module, up-converter module, the first filtration module, amplification mould
Block and antenna；First upstream cell, includes successively：Antenna, down conversion module, the second filtration module and electro-optic conversion list
Member.
It should be noted that the antenna in first downstream units is same with the antenna in first upstream cell
Individual entity.
Fig. 4 is the structure composition block diagram of outdoor data unit ODU and antenna.As shown in figure 4, the outdoor data unit
ODU and antenna, including：For receive microwave signal and realize microwave to multicarrier intermediate-freuqncy signal shift frequency, filtering second under
Row unit and for realizing shift frequency of the multicarrier intermediate-freuqncy signal to microwave, the second upstream cell for filtering, amplify and launching；
Second downstream units, include successively：Antenna, down conversion module and the first filtration module；Described second is up
Unit, includes successively：Up-converter module, the second filtration module, amplification module and antenna.
It should be noted that the antenna in second downstream units is same with the antenna in second upstream cell
Individual entity.
In this programme, the remote antenna unit R AU and antenna simultaneously with multiple outdoor data unit ODU
And antenna is communicated, and each described outdoor data unit ODU and antenna use identical microwave frequency.
In this programme, the distal end WDM modules handle multiple wavelength signals on the trunk optical fiber by partial wave
Afterwards, the signal of each of which wavelength connects a remote antenna unit R AU and antenna by a jumping fiber.
Each remote antenna unit R AU and antenna wireless covering is no more than 8 outdoor data unit ODU and antenna；
Each the outdoor data unit ODU and antenna connect a broadband services unit B TU by coaxial cable；Each broadband
Business unit BTU includes 2 speech interfaces and 4 Ethernet interfaces, wherein, the speech interface is used to connect subsets
Speech business is accessed, the too network interface is used for access band data, video traffic and connection family gateway equipment.
Multichannel ROF system described in this programme is in downlink operation, and its data transmission procedure is as follows：
1st, the business datum of the local side network equipment is transmitted to main control module, master control by local side apparatus ROFCS first line of a couplet module
Business datum is distributed to corresponding MROF modules by module；
2nd, the business datum received is carried out coded modulation by MROF modules by its internal OFDM module, is sent to and is penetrated
Frequency processing module, radio frequency processing module carries out digital-to-analogue conversion, up-conversion filtering and enhanced processing to signal, then by penetrating for obtaining
Frequency signal is sent to photoelectric conversion module, by photoelectric conversion module, and radiofrequency signal is converted into optical signal and sent；
3rd, each MROF modules light carries radio frequency interface and uses different wavelength, and the optical signal of these different wave lengths passes through local side
After WDM module multiplex, it is output on a trunk optical fiber and is sent to distal end WDM modules；
4th, WDM modules in distal end are by multiple wavelength signals on an optical fiber, after partial wave is handled, the letter of each of which wavelength
Number pass through a jumping fiber, one remote antenna unit R AU of connection and antenna；
5th, the optical signal received is converted into radiofrequency signal by remote antenna unit R AU, and then radiofrequency signal is carried out to become
Frequency filtering and enhanced processing, obtain microwave signal, microwave signal are launched by antenna；
6th, outdoor data unit ODU receives the microwave signal that remote antenna unit R AU and antenna are sent by antenna, right
Signal carries out down coversion filtering process, obtains intermediate-freuqncy signal；
7th, intermediate-freuqncy signal is transmitted to broadband services unit B TU by outdoor data unit ODU by coaxial cable；
8th, broadband services unit B TU receives the intermediate-freuqncy signal of outdoor data unit ODU transmittings, and down coversion is carried out to signal
Filtering and analog-to-digital conversion process, obtain data signal, giving OFDM modules by data signal is demodulated, and finally gives business number
According to.
Multichannel ROF system described in this programme is when up-link works, and its data transmission procedure is as follows：
1st, broadband services unit B TU obtains business datum, business datum by 2 speech interfaces and 4 Ethernet interfaces
OFDM modules are transmitted to by the Switching Module inside broadband services unit B TU and carry out coded modulation, during the data after modulation are passed through
Frequency processing module, digital-to-analogue conversion, up-conversion filtering and enhanced processing are carried out to signal, intermediate-freuqncy signal is obtained；
2nd, intermediate-freuqncy signal is transmitted to outdoor data unit ODU by broadband services unit B TU by coaxial cable；
3rd, outdoor data unit ODU receives the intermediate-freuqncy signal of broadband services unit B TU transmissions, and up-conversion is carried out to signal
Filtering and enhanced processing, obtain microwave signal, microwave signal are launched by antenna；
4th, remote antenna unit R AU receives the microwave signal of outdoor data unit ODU transmissions by antenna, first to letter
Number carry out down coversion filtering process, obtain radiofrequency signal, then by photoelectric conversion module, by radiofrequency signal be converted into light letter
Number；
5th, each remote antenna unit R AU light carries radio frequency interface and uses different wavelength, the optical signal of these different wave lengths
After the WDM module multiplex of distal end, it is output on a trunk optical fiber and is sent to local side WDM modules；
6th, local side WDM modules are by multiple wavelength signals on a trunk optical fiber, after partial wave is handled, each of which wavelength
Signal pass through a jumping fiber, connect a MROF module；
7th, MROF modules will receive optical signal by photoelectric conversion module, be converted into radiofrequency signal, and radiofrequency signal is passed through
Down coversion is filtered and analog-to-digital conversion process, obtains data signal, OFDM modules are demodulated to data signal, have finally given industry
Business data；
8th, business datum is transmitted to first line of a couplet module by MROF modules by main control module, and business datum is transmitted to by first line of a couplet module again
The local side network equipment.
Examples detailed above is not limited for the present invention preferably embodiment, but embodiments of the present invention by above-described embodiment
System, other any Spirit Essences for not running counter to the present invention and the change made under principle, modification, replacement, combine, simplification all should
For equivalent substitute mode, it is included within protection scope of the present invention.
Claims (9)
1. a kind of multichannel ROF system based on WDM and OFDM technology, it is characterised in that wrapped successively from local side to service terminal
Include：For realizing the local side apparatus ROFCS that local side business platform data are changed to multicarrier radio frequency optical signal, for local side to be set
The multicarrier radio frequency optical signal that standby ROFCS is exported carries out the local side WDM modules of multiplex processing, the trunk for transmitting multiplex signal
Optical fiber, the distal end WDM modules for the multiplex signal in trunk optical fiber to be carried out to partial wave processing, for by the multicarrier after partial wave
Radio frequency optical signal carries out shift frequency between conversion, multicarrier radiofrequency signal and the microwave of photosignal, filter amplifying processing and complete
Into the remote antenna unit R AU and antenna of transmitting, for receiving microwave signal and realizing between microwave and multicarrier intermediate-freuqncy signal
Shift frequency, the outdoor data unit ODU and antenna of filter amplifying processing, and for realizing multicarrier intermediate-freuqncy signal and Ethernet
The broadband services unit B TU changed between data；
Wherein, the local side apparatus ROFCS connects after the light load radio frequency interface on panel is connected by jumping fiber with local side WDM modules
Connect, the local side WDM modules are connected by trunk optical fiber with distal end WDM modules, the distal end WDM modules pass through jumping fiber and distal end
Antenna element RAU and antenna connection, the remote antenna unit R AU and antenna pass through microwave and outdoor data unit ODU and day
Line is communicated, and the outdoor data unit ODU and antenna are connected by coaxial cable with broadband services unit B TU；
The local side apparatus ROFCS, including：Arrived for completing distinct interface speed, the business platform data of distinct interface form
The first line of a couplet module of backboard Fast Ethernet data adaptation, for completing the master control that the multichannel of Fast Ethernet data is exchanged and managed
Module, and for realizing conversion between multichannel Ethernet data and multicarrier radiofrequency signal and for realizing multicarrier
The MROF modules of conversion between radiofrequency signal and multicarrier radio frequency optical signal；
Wherein, the first line of a couplet module, each MROF module are connected by backboard high speed data bus with main control module；The office
End equipment ROFCS is connected to the extraneous local side network equipment by its internal first line of a couplet module；The local side apparatus ROFCS is propped up simultaneously
Hold multiple MROF modules.
2. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that wherein, institute
State the local side network equipment, including voice traffic services device, video traffic server, data service router.
3. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that the MROF
Module, including：Switching Module, management module, OFDM modules, radio frequency processing module, photoelectric conversion module；
The local side business platform data are by the Switching Module being sequentially connected, OFDM modules, radio frequency processing module, opto-electronic conversion
After module export multicarrier radio frequency optical signal, the management module respectively with Switching Module, OFDM modules, radio frequency processing module,
Photoelectric conversion module is connected.
4. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that the local side
The multicarrier radio frequency optical signal for the different wave length that WDM modules export local side difference MROF modules carries out multiplex processing, passes through one
Trunk optical fiber described in root is transmitted.
5. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that the distal end
Antenna element RAU and antenna, including：For realize photoelectric signal transformation, the shift frequency of multicarrier radiofrequency signal to microwave, filtering,
Amplify and complete transmitting the first downstream units and for realize receive and complete microwave to multicarrier radiofrequency signal shift frequency,
Filtering and the first upstream cell of electro-optical signal conversion；
First downstream units, include successively：Photoelectric conversion module, up-converter module, the first filtration module, amplification module and
Antenna；First upstream cell, includes successively：Antenna, down conversion module, the second filtration module and electrooptic switching element.
6. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that the outdoor
Data cell ODU and antenna, including：For receive microwave signal and realize microwave to multicarrier intermediate-freuqncy signal shift frequency, filtering
The second downstream units and for realize multicarrier intermediate-freuqncy signal to microwave shift frequency, filter, amplify and launch second
Row unit；
Second downstream units, include successively：Antenna, down conversion module and the first filtration module；Second upstream cell,
Include successively：Up-converter module, the second filtration module, amplification module and antenna.
7. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that described in one
Remote antenna unit R AU and antenna are communicated with multiple the outdoor data unit ODU and antenna simultaneously, and each institute
State outdoor data unit ODU and antenna and all use identical microwave frequency.
8. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that the broadband
Business unit BTU, including：IF process module, OFDM modules, Switching Module, business interface module and management module；
The multicarrier intermediate-freuqncy signal that the outdoor data unit ODU and antenna are produced through being sequentially connected IF process module,
Outgoing traffic data after OFDM modules, Switching Module, business interface module, the management module respectively with IF process module,
OFDM modules, Switching Module, the connection of business interface module.
9. the multichannel ROF system according to claim 1 based on WDM and OFDM technology, it is characterised in that the distal end
WDM modules are by multiple wavelength signals on the trunk optical fiber after partial wave is handled, and the signal of each of which wavelength passes through one
Root jumping fiber connects a remote antenna unit R AU and antenna；
Each remote antenna unit R AU and antenna wireless covering is no more than 8 outdoor data unit ODU and antenna；Each
The outdoor data unit ODU and antenna connect a broadband services unit B TU by coaxial cable；Each broadband services
Unit B TU includes 2 speech interfaces and 4 Ethernet interfaces, wherein, the speech interface is used to connect subsets access
Speech business, the too network interface is used for access band data, video traffic and connection family gateway equipment.
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| US11405797B2 (en) | 2018-03-19 | 2022-08-02 | Charter Communications Operating, Llc | Apparatus and methods for cell activation in wireless networks |
| US11716558B2 (en) | 2018-04-16 | 2023-08-01 | Charter Communications Operating, Llc | Apparatus and methods for integrated high-capacity data and wireless network services |
| CN108966279B (en) * | 2018-08-17 | 2020-02-18 | 北京邮电大学 | Radio over fiber access method and system based on central pressure marginalization |
| WO2020077346A1 (en) | 2018-10-12 | 2020-04-16 | Charter Communications Operating, Llc | Apparatus and methods for cell identification in wireless networks |
| US11843474B2 (en) | 2020-02-11 | 2023-12-12 | Charter Communications Operating, Llc | Apparatus and methods for providing high-capacity data services over a content delivery network |
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