CN105120377B - Wireless forward pass Transmission system and method based on wavelength-selective switches - Google Patents
Wireless forward pass Transmission system and method based on wavelength-selective switches Download PDFInfo
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Abstract
The present invention provides a kind of wireless forward pass Transmission system and method based on wavelength-selective switches, including central machine room, branched system optical fiber, multiple cells groups, the central machine room are connected to multiple cells groups by branched system optical fiber；Wherein, central machine room realizes that baseband capabilities are shared to the flow scheduling in wireless forward pass Transmission system for completing；Cells group of each of multiple cells groups includes several distal end cells, and several distal end cells can call the base-band resource of central machine room；Branched system optical fiber transmits for realizing the data of central machine room and multiple cells groups.The present invention also provides corresponding methods, by using efficient analog intermediate frequency ofdm signal, make the central machine room and distal end cells that need a large amount of wavelength resources originally, only need a few wavelength resource that can meet the maximum flow demand of website, overhead is effectively reduced, improves system performance.
Description
Technical field
The present invention relates to technical field of photo communication, and in particular, to the wireless forward pass based on wavelength-selective switches transmits system
System and method.
Background technique
Quick with 4G network is popularized, and network capacity increases increasingly.Cloud wireless access network C-RAN is convenient and fast due to it
Resource management, low energy consumption, low cost and the advantages such as easily operated are gradually paid close attention to by industry, that is, pass through baseband processing unit BBU
And the separation of remote radio unit (RRU) RRU, greatly promote system effectiveness.Common public radio interface CPRI be currently BBU and
The agreement of wireless signal is transmitted between RRU, but its efficiency is lower, capacity needed for being unable to satisfy Future cellular net.Therefore, through to existing
There is literature search discovery, 2014, Ming Zhu of Huawei Tech Co., Ltd et al. was in Optical Fibre
Entitled " High-Capacity Mobi le Fronthaul has been delivered in Communication (fiber optic communication) meeting
8 × 8MIMO " of Supporting LTE-Advanced Carrier Aggregation and (support LTE-A carrier wave polymerization and
Forward pass Transmission system that the high capacity of 8 × 8MIMO is wireless) article.In the document, author is proposed in wireless forward pass Transmission system
In, analog intermediate frequency ofdm signal is transmitted using optical fiber in such a way that wavelength-division multiplex and subcarrier multiplex combine, can greatly be mentioned
Raising frequency spectrum efficiency, thus wavelength number needed for reducing.Such as: for 3 sectors (3RRU), the polymerization of 5 wireless carriers, 8 × 8MIMO days
The 4+G cells of line configuration, it is assumed that the site traffic reaches maximum, then when being transmitted using CPRI, uplink and downlink needs 30 altogether
The wavelength of a fully loaded 10Gbit/s digital signal, and use analog if signal, it is only necessary to 2 bandwidth are 2G, respectively carry 12
The wavelength of a narrowband 100MHz OFDM wireless signal, this is of great advantage to overhead, lifting system efficiency is reduced.
Moreover, the light resource of above-mentioned wireless forward pass Transmission system is to carry out point-to-point fixed configurations according to cells
, in order to meet the maximum stream flow demand of multiple regions simultaneously, need to arrange a certain number of light for each website in local side
Transmitter and receiver, these resources not can be carried out it is shared, and be generally not simultaneously it is in running order, cause the spare time of hardware
Waste is set, keeps system hardware expense big, at high cost, when the flow demand of system carries out the variation of " tidal effect ", this germline
System can not be coped with flexibly, and efficiency is lower.On the other hand, when flow system flow is lower (such as night), local side still needs to be each
At least a pair of of optical transceiver of a site configuration, can not achieve multi-site and shares same optical wavelength, cause energy waste.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of wireless forward pass based on wavelength-selective switches
Transmission system and method.
The wireless forward pass Transmission system based on wavelength-selective switches provided according to the present invention, including central machine room, feeder line
Formula optical fiber, multiple cells groups, the central machine room are connected to multiple cells groups by branched system optical fiber；Its
In,
The central machine room realizes that baseband capabilities are shared to the flow scheduling in wireless forward pass Transmission system for completing；
Cells group of each of the multiple cells group includes several distal end cells,
And the distal end cells can call the base-band resource of central machine room；
The branched system optical fiber transmits for realizing the data of central machine room and multiple cells groups.
Preferably, the central machine room includes: BBU Base-Band Processing pond, optical sender pond, photoreceiver pond, wavelength-division multiplex
Device, downstream wavelength selection switch, upstream wavelength select switch, coupler, circulator；Wherein, the output end in BBU Base-Band Processing pond
It is connected by the optical sender pond with the input terminal of wavelength division multiplexer, the output end of the wavelength division multiplexer is connected to down going wave
The input terminal of long selection switch, the downstream wavelength select the multiple output ports switched the first end with multiple circulators respectively
Mouth connects one by one；The third port of the multiple circulator is connect with multiple input ports of coupler one by one respectively, the coupling
The input terminal of the output end connection upstream wavelength selection switch of clutch, multiple output ports of the upstream wavelength selection switch are logical
Photoreceiver pond is crossed to be connected with the input terminal in BBU Base-Band Processing pond；The second port of the multiple circulator constitutes the center
Multiple input/output ports of computer room；
BBU Base-Band Processing pond, including multiple baseband processing units, for realizing base-band resource dynamic allocation and
It is shared；
The optical sender pond, including multiple optical senders for realizing the dynamic dispatching to optical sender and are shared；
The photoreceiver pond, including multiple photoreceivers for realizing the dynamic dispatching to photoreceiver and are shared；
The wavelength division multiplexer, the baseband signal sent for coupling the optical sender pond；
The downstream wavelength selection switch, for carrying out multiple port wavelength distribution, and the wave according to downstream wavelength signal
The downstream wavelength signal that multiple output ports of long selection switch are drawn can carry one or more distal end honeycombs simultaneously
The information of website；
The coupler, the upstream wavelength signal sent for coupling multiple distal end cells；
Upstream wavelength signal is carried out multiterminal for the output signal according to coupler by the upstream wavelength selection switch
It is sent into different photoreceivers after mouth Wavelength Assignment, realizes that the photoreceiver in the photoreceiver pond can receive detection simultaneously
One or more upstream wavelength signals；
Upstream wavelength signal is delivered to coupling for changing the transmission direction of upstream wavelength signal by the circulator
Device.
It preferably, further include several optical splitters, several input/output ports of the central machine room pass through corresponding
One optical splitter is connected to some cells group, for the baseband signal of central machine room to be sent to each distal end cellular station
Point.
Preferably, the distal end cells internal element include: optic tunable filter, photoreceiver, optical sender, in
Frequency radio frequency front-end unit, far end radio frequency head, in which:
The optic tunable filter selects carrying accordingly for receiving the downstream wavelength signal after passing through optical splitter, and considering
The wavelength signals of cells information；
The photoreceiver considers the downstream wavelength signal selected for receiving the detection optic tunable filter；
The intermediate frequency radio frequency front-end unit, the wavelength signals for detecting to the photoreceiver are filtered and upper change
Frequency is handled；
The far end radio frequency head, for receiving the intermediate frequency radio frequency front-end unit filtering and the wavelength signals after up-conversion,
And the optical sender for the distal end cells being loaded into after wavelength signals progress down coversion, filtering；
The optical sender receives the wavelength signals after the far end radio frequency head down coversion, filtering processing, and utilizes
The wavelength signals are sent back central machine room by the mode of wavelength-division multiplex.
Preferably, the signal carried in the wireless forward pass Transmission system described based on wavelength-selective switches is that simulation is orthogonal
Frequency division multiplexing intermediate-freuqncy signal, and the simulation orthogonal frequency division multiplexing intermediate-freuqncy signal generates format and defers to wireless protocols and standard,
The signal of middle generation occupies the different IF region of frequency domain respectively, and also there are certain protection intervals between different IF, i.e., same
It include several analog if signals in one frequency band.
The wireless forward pass transmission method based on wavelength-selective switches provided according to the present invention, includes the following steps:
Step 1: the central machine room that building can be realized flow scheduling and baseband capabilities are shared；
Step 2: the multiple cells groups comprising several distal end cells of building；
Step 3: the central machine room is interconnected by branched system optical fiber and multiple cells groups.
Preferably, the step 1 includes: building BBU Base-Band Processing pond, optical sender pond, photoreceiver pond, and by BBU
The output end in Base-Band Processing pond is connected by the optical sender pond with the input terminal of wavelength division multiplexer, by the wavelength division multiplexer
Output end be connected to downstream wavelength selection switch input terminal, by the downstream wavelength selection switch multiple output ports with
The first port of multiple a circulators connects one by one；By multiple input terminals of the third port of multiple circulators and coupler
Mouth connects one by one, and the input terminal of the output end connection upstream wavelength selection switch of the coupler selects the upstream wavelength
The multiple output ports for selecting switch are connected by photoreceiver pond with the input terminal in BBU Base-Band Processing pond；Then multiple annulars
The second port of device constitutes several input/output ports of the central machine room.
Preferably, the step 2 includes:
Step 2.1: utilizing optic tunable filter, photoreceiver, optical sender, intermediate frequency radio frequency front-end unit, far end radio frequency
Head constructs several distal end cells；
Step 2.1.1: worry choosing is carried out using downstream wavelength signal of the optic tunable filter to input, obtains carrying corresponding bee
The wavelength signals of nest site information；
Step 2.1.2: the detection optic tunable filter is received using photoreceiver and considers the downstream wavelength signal selected；
Step 2.1.3: being filtered using the wavelength signals that intermediate frequency radio frequency front-end unit detects the photoreceiver and
Upconversion process；
Step 2.1.4: the wavelength after the intermediate frequency radio frequency front-end unit filtering and up-conversion is received using far end radio frequency head
Signal, and the optical sender for the distal end cells being loaded into after wavelength signals progress down coversion, filtering；
Step 2.1.5: the wavelength after the far end radio frequency head down coversion, filtering processing is received using optical sender and is believed
Number, and the wavelength signals are sent back into central machine room in the way of wavelength-division multiplex；
Step 2.2: several distal end cells being grouped, multiple cells groups are constituted.
Preferably, the step 3 includes: to increase several optical splitters on branched system fibre circuit, and each described bee
Nest website group corresponds to an optical splitter.
Preferably, the signal carried in the wireless forward pass transmission method described based on wavelength-selective switches is that simulation is orthogonal
Frequency division multiplexing intermediate-freuqncy signal, and the simulation orthogonal frequency division multiplexing intermediate-freuqncy signal generates format and defers to wireless protocols and standard,
The signal of middle generation occupies the different IF region of frequency domain respectively, and also there are certain protection intervals between different IF, i.e., same
It include several analog if signals in one frequency band.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, system provided by the invention makes full use of flexibly configurable wavelength-selective switches to the optical sender in local side pond
Pond and photoreceiver pond carry out flexible dispatching, and wireless forward pass Transmission system uplink and downlink is made to have bigger flexibility and resource-sharing
Property.
2, the method in the present invention makes to need a large amount of wavelength to provide originally by using efficient analog intermediate frequency ofdm signal
The central machine room and distal end cells in source, it is only necessary to a few wavelength resource can meet the maximum flow demand of website,
Overhead is effectively reduced, improves system performance.
3, the method in the present invention shares wavelength by the multiple cells of downlink, makes originally in running order light hair
The quantity part for penetrating machine is reduced, effectively save energy consumption, and resource utilization is higher.
4, the system in the present invention uses the mature optical device of technology, farthest mentions under the premise of low cost
High system performance is not only easy to realize, and can directly be transformed upgrading on the basis of existing forward pass system.
5, scheduling of the method in the present invention by downstream wavelength selection switch, the light resource tune that central machine room can be left unused
The distal end cells that dispensing needs, keeps resource utilization higher, while hardware resource needed for saving system, reduce at
This, successfully manages tidal effect, cell breath phenomenon.
6, the system in the present invention is by collocating uplink wavelength-selective switches, keeps multiple wavelength common strong by one simultaneously
Degree detection photoreceiver receives detection, and this receiver shared mechanism makes resource utilization ratio higher, makes original by shared
This needs the system energy consumption of multiple receivers to reduce, and efficiency improves.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of the wireless forward pass Transmission system provided by the invention based on wavelength-selective switches；
Fig. 2 is for cells group in the wireless forward pass Transmission system provided by the invention based on wavelength-selective switches and far
Hold the structural schematic diagram of light unit configuration inside cells；
Fig. 3 be the wireless forward pass Transmission system provided by the invention based on wavelength-selective switches in, downlink optical fiber link away from
When from for 100km, 16QAM-OFDM signal demodulates the planisphere obtained after distal end cells reception.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
The wireless forward pass Transmission system based on wavelength-selective switches provided according to the present invention, including central machine room, feeder line
Formula optical fiber, multiple cells groups, the central machine room are connected to multiple cells groups by branched system optical fiber；Its
In,
The central machine room realizes that baseband capabilities are shared to the flow scheduling in wireless forward pass Transmission system for completing；
Cells group of each of the multiple cells group includes several distal end cells,
And the distal end cells can call the base-band resource of central machine room；
The branched system optical fiber transmits for realizing the data of central machine room and multiple cells groups.
Preferably, the central machine room includes: BBU Base-Band Processing pond, optical sender pond, photoreceiver pond, wavelength-division multiplex
Device, downstream wavelength selection switch, upstream wavelength select switch, coupler, circulator；Wherein, the output end in BBU Base-Band Processing pond
It is connected by the optical sender pond with the input terminal of wavelength division multiplexer, the output end of the wavelength division multiplexer is connected to down going wave
The input terminal of long selection switch, the downstream wavelength select the multiple output ports switched the first end with multiple circulators respectively
Mouth connects one by one；The third port of several circulators and multiple input ports of coupler connect one by one, the coupling
The input terminal of the output end connection upstream wavelength selection switch of device, multiple output ports of the upstream wavelength selection switch pass through
Photoreceiver pond is connected with the input terminal in BBU Base-Band Processing pond；The second port of the multiple circulator constitutes the center machine
Multiple input/output ports in room；
BBU Base-Band Processing pond, including multiple baseband processing units, for realizing base-band resource dynamic allocation and
It is shared；
The optical sender pond, including multiple optical senders for realizing the dynamic dispatching to optical sender and are shared；
Specifically, the optical sender pond in the central machine room, pond scheme be by the wavelength division multiplexer,
The optical sender of different wave length is coupled, the wavelength-selective switches are re-fed into.
The photoreceiver pond, including multiple photoreceivers for realizing the dynamic dispatching to photoreceiver and are shared；
The wavelength division multiplexer, the baseband signal sent for coupling the optical sender pond；
The downstream wavelength selection switch, for carrying out multiple port wavelength distribution, and the wave according to downstream wavelength signal
The downstream wavelength signal that multiple output ports of long selection switch are drawn can carry one or more distal end honeycombs simultaneously
The information of website；Concrete mode is that the analog signal for belonging to the different distal end cells is loaded into different IF respectively,
It is sent after being multiplexed by the optical sender.
Specifically, after the wavelength polymerization input of the wavelength division multiplexer, the output port of the downstream wavelength selection switch
Multiple downlink optical fiber links are respectively connected to, each output port of the wavelength-selective switches corresponds to one group of wavelength resource, leads to
The wavelength set that the selection of downstream wavelength described in the central machine room flexible configuration switchs each output port is crossed, is realized according to system
Wavelength resource in optical sender pond described in flow demand flexible dispatching.
The coupler, the upstream wavelength signal sent for coupling multiple distal end cells；
Upstream wavelength signal is carried out multiterminal for the output signal according to coupler by the upstream wavelength selection switch
It is sent into different photoreceivers after mouth Wavelength Assignment, realizes that the photoreceiver in the photoreceiver pond can receive detection simultaneously
One or more upstream wavelength signals；
Specifically, after the polymerization input of the wavelength of the coupler, by configuring the upstream wavelength selection switch
Output port wavelength set realizes the photoreceiver in the photoreceiver pond while receiving the one or more upgoing waves of detection
It is long.
Upstream wavelength signal is delivered to coupling for changing the transmission direction of upstream wavelength signal by the circulator
Device.
Specifically, as shown in Figure 1, the wireless forward pass Transmission system based on wavelength-selective switches, comprising: central machine room, feedback
Wire type optical fiber and distal end cells.The central machine room is connected to each cells group in distal end by branched system optical fiber,
Each cells group includes several cells.The wireless forward pass Transmission system is with cloud wireless access network C-RAN work
For system architecture, baseband processing unit BBU is located at central machine room, is concentrated and is carried out at data using the hardware processing resources in pond
Reason, remote radio unit (RRU) is located at distal end cells, for realizing signal transmission function.The wireless forward pass Transmission system, fills
Divide and flexible dispatching carried out to the optical sender pond in local side pond and photoreceiver pond using flexibly configurable wavelength-selective switches,
For meeting the flow demand of user's real-time change in wireless forward pass system, make the optical sender pond in wireless forward pass Transmission system
And photoreceiver pond has better resource-sharing.The downstream wavelength selection switch, according to different optical fiber link downlinks
Flow demand, the variable wavelength resource of quantity allotted；The upstream wavelength selection switch, according to connecing for different optical fiber link uplinks
Signal bandwidth is received, the variable photoreceiver of quantity allotted is received.Wherein, λ shown in Fig. 1d1Indicate the 1st down going wave
It is long, λd2Indicate the 2nd downstream wavelength, and so on, λdLIndicate l-th downstream wavelength；D1What expression was exported from the 1st port WSS
Wavelength set, D2Indicate the wavelength set exported from the 2nd port WSS, and so on, DMIndicate the wave exported from WSS M port
Long set；U1Indicate the corresponding upstream wavelength set of the 1st cells group, U2Indicate that the 2nd cells group is corresponding
Upstream wavelength set, and so on, UMIndicate the corresponding upstream wavelength set of m-th cells group；Ur1Indicate the 1st office
Hold the received wavelength set of photoreceiver institute, Ur2Indicate the 2nd received wavelength set of local side optical receiver institute, UrNIndicate N
The received wavelength set of a local side optical receiver institute.
Further, the optical sender pond in central machine room, optical sender hardware resource therein are not served
A certain specific distal end cells, any distal end cells have an opportunity to call the light in the central machine room
Any optical sender hardware resource in transmitter pond, i.e., the described optical sender pond have any distal end cells
Sharing.Wherein, the wavelength interval that the optical sender uses needs to meet the standard of ITU-T, for example wavelength interval can be with
For 100GHz, it is also possible to 200GHz etc..
It preferably, further include several optical splitters, several input/output ports of the central machine room pass through corresponding
One optical splitter is connected to some cells group, for the baseband signal of central machine room to be sent to each distal end cellular station
Point.Specifically, the distant-end node of the downlink optical fiber link carries out the transmission of signal branch using optical splitter, with point-to-multipoint
Wavelength resource is distributed to multiple cells by mode.1:N optical branching/combiner of the light distant-end node, wherein N is nothing
The quantity of cells in line forward pass, N can get 8,16,32,64,128,256,512 etc., and (its number is mainly according to system
In transmission fiber length).
Specifically, every optical fiber link that multiple output ports of downstream wavelength selection switch are drawn is in distal end by light splitting
Lead to one group of cells group later, constitutes multiple optical distribution networks, for the baseband signal of central machine room to be sent to website, and
Wavelength resource is distributed to multiple cells in a manner of point-to-multipoint.
Further, every optical fiber link distance that multiple output ports of the downstream wavelength selection switch are drawn is total
Length is the range of 1 km to 100 kms.Every optical fiber that multiple output ports of the downstream wavelength selection switch are drawn
Link range total length is 1 km to the range of 100 kms, generally 20km, 40km, 60km, 80km, 100km, is laid with length
Degree will be comprehensively considered according to the specific needs of system to determine.
Preferably, the distal end cells internal element include: optic tunable filter, photoreceiver, optical sender, in
Frequency radio frequency front-end unit, far end radio frequency head, in which:
The optic tunable filter selects carrying accordingly for receiving the downstream wavelength signal after passing through optical splitter, and considering
The wavelength signals of cells information；
The photoreceiver considers the downstream wavelength signal selected for receiving the detection optic tunable filter；
Specifically, the optical sender of the distal end cells, the analog if signal sent can be independent
It is received by the photoreceiver of the central machine room, the analog intermediate frequency that can also be sent with distal end cells described in other
Signal shares the photoreceiver of the central machine room, and concrete mode is that will belong to the simulation of the different distal end cells
Signal is loaded into different IF respectively, goes upward to the central machine room by the mode of wavelength-division multiplex, passes through institute after being coupled
The same photoreceiver is sent into the configuration for stating wavelength-selective switches.
Further, the photoreceiver that the central machine room and the distal end cells use is flat for common intensity
The envelope detected photoreceiver of side's rule detection.
The intermediate frequency radio frequency front-end unit, the wavelength signals for detecting to the photoreceiver are filtered and upper change
Frequency is handled；
The far end radio frequency head, for receiving the intermediate frequency radio frequency front-end unit filtering and the wavelength signals after up-conversion,
And the optical sender for the distal end cells being loaded into after wavelength signals progress down coversion, filtering；
The optical sender receives the wavelength signals after the far end radio frequency head down coversion, filtering processing, and utilizes
The wavelength signals are sent back central machine room by the mode of wavelength-division multiplex.Specifically, the light of any distal end cells
Transmitter, the wavelength that uplink transmitting uses are different.
Specifically, as shown in Fig. 2, the wavelength resource in downlink enters the optic tunable filter by optical splitter,
Enter photoreceiver after wavelength filtering, receives the wavelength signals detected and filtered by the intermediate frequency radio frequency front-end unit
Optical sender is sent to by the far end radio frequency head after wave, up-conversion.The wavelength resource that distal end cells is sent is by different
Optical fiber link return to the central machine room after, by circulator deflecting act on, optical wavelength is sent into the central machine room
The coupler wavelength selection that the wavelength resource after polymerization is sent into uplink is opened by the coupling of the coupler
It closes, the output port of wavelength-selective switches is finally accessed to the photoreceiver pond of the central machine room.Wherein, the annular
Device first port accesses the output port of downstream wavelength selection switch, and the circulator second port accesses downlink optical fiber link,
The circulator third port switch-in coupler.
Further, the photoreceiver of the distal end cells or optical sender can need to open or close according to business
Close correspondingly received or emitter.
Preferably, the signal carried in the wireless forward pass Transmission system described based on wavelength-selective switches is that simulation is orthogonal
Frequency division multiplexing intermediate-freuqncy signal, and the simulation orthogonal frequency division multiplexing intermediate-freuqncy signal generates format and defers to wireless protocols and standard,
The signal of middle generation occupies the different IF region of frequency domain respectively, and also there are certain protection intervals between different IF, i.e., same
It include several analog if signals in one frequency band.
The wireless forward pass transmission method based on wavelength-selective switches provided according to the present invention, includes the following steps:
Step 1: the central machine room that building can be realized flow scheduling and baseband capabilities are shared；
Step 2: the multiple cells groups comprising several distal end cells of building；
Step 3: the central machine room is interconnected by branched system optical fiber and multiple cells groups.
Preferably, the step 1 includes: building BBU Base-Band Processing pond, optical sender pond, photoreceiver pond, and by BBU
The output end in Base-Band Processing pond is connected by the optical sender pond with the input terminal of wavelength division multiplexer, by the wavelength division multiplexer
Output end be connected to downstream wavelength selection switch input terminal, by the downstream wavelength selection switch multiple output ports with
The first port of multiple circulators connects one by one；By multiple input ports of the third port of multiple circulators and coupler
It connects one by one, the input terminal of the output end connection upstream wavelength selection switch of the coupler selects the upstream wavelength
Multiple output ports of switch are connected by photoreceiver pond with the input terminal in BBU Base-Band Processing pond；Then multiple circulators
Second port constitute several input/output ports of the central machine room.
Preferably, the step 2 includes:
Step 2.1: utilizing optic tunable filter, photoreceiver, optical sender, intermediate frequency radio frequency front-end unit, far end radio frequency
Head constructs several distal end cells；
Step 2.1.1: worry choosing is carried out using downstream wavelength signal of the optic tunable filter to input, obtains carrying corresponding bee
The wavelength signals of nest site information；
Step 2.1.2: the detection optic tunable filter is received using photoreceiver and considers the downstream wavelength signal selected；
Step 2.1.3: being filtered using the wavelength signals that intermediate frequency radio frequency front-end unit detects the photoreceiver and
Upconversion process；
Step 2.1.4: the wavelength after the intermediate frequency radio frequency front-end unit filtering and up-conversion is received using far end radio frequency head
Signal, and the optical sender for the distal end cells being loaded into after wavelength signals progress down coversion, filtering；
Step 2.1.5: the wavelength after the far end radio frequency head down coversion, filtering processing is received using optical sender and is believed
Number, and the wavelength signals are sent back into central machine room in the way of wavelength-division multiplex；
Step 2.2: several distal end cells being grouped, multiple cells groups are constituted.
Preferably, the step 3 includes: to increase several optical splitters on branched system fibre circuit, and each described bee
Nest website group corresponds to an optical splitter.
Preferably, the signal carried in the wireless forward pass transmission method described based on wavelength-selective switches is that simulation is orthogonal
Frequency division multiplexing intermediate-freuqncy signal, and the simulation orthogonal frequency division multiplexing intermediate-freuqncy signal generates format and defers to wireless protocols and standard,
The signal of middle generation occupies the different IF region of frequency domain respectively, and also there are certain protection intervals between different IF, i.e., same
It include several analog if signals in one frequency band.
Specifically, as shown in figure 3, when the wireless forward pass Transmission system downlink optical fiber link range is 100km, 16QAM-
Ofdm signal demodulates the planisphere obtained after distal end cells reception.It can be seen that present invention meaning is wireless
Forward pass Transmission system can not only cover the cells of 100km range, and can reach the preferable bit error rate, Error Vector Magnitude
Value and higher optical power budget.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (3)
1. a kind of wireless forward pass Transmission system based on wavelength-selective switches, which is characterized in that including central machine room, branched system light
Fine, multiple cells group, the central machine room are connected to multiple cells groups by branched system optical fiber；Wherein,
The central machine room realizes that baseband capabilities are shared to the flow scheduling in wireless forward pass Transmission system for completing；
Cells group of each of the multiple cells group includes several distal end cells, and institute
The base-band resource of central machine room can be called by stating distal end cells；
The branched system optical fiber transmits for realizing the data of central machine room and multiple cells groups；
The signal carried in the wireless forward pass Transmission system based on wavelength-selective switches is in simulation orthogonal frequency division multiplexing
Frequency signal, and the simulation orthogonal frequency division multiplexing intermediate-freuqncy signal generates format and defers to wireless protocols and standard, wherein the letter generated
It number occupies the different IF region of frequency domain respectively, also there are certain protection interval between different IF, i.e., is wrapped in identical frequency band
Contain several analog if signals；The central machine room includes: BBU Base-Band Processing pond, optical sender pond, photoreceiver pond, wave
Division multiplexer, downstream wavelength selection switch, upstream wavelength select switch, coupler, circulator；Wherein, BBU Base-Band Processing pond
Output end is connected by the optical sender pond with the input terminal of wavelength division multiplexer, and the output end of the wavelength division multiplexer is connected to
The input terminal of downstream wavelength selection switch, multiple output ports of downstream wavelength selection switch respectively with multiple circulators
First port connects one by one；The third port of the multiple circulator is connect with multiple input ports of coupler one by one respectively,
The input terminal of the output end connection upstream wavelength selection switch of the coupler, multiple outputs of the upstream wavelength selection switch
Port is connected by photoreceiver pond with the input terminal in BBU Base-Band Processing pond；The second port of the multiple circulator constitutes institute
State multiple input/output ports of central machine room；Several input/output ports of the central machine room pass through corresponding one point
Light device is connected to some cells group, for the baseband signal of central machine room to be sent to each distal end cells；
The distal end cells internal element includes: optic tunable filter, photoreceiver, optical sender, intermediate frequency radio-frequency front-end
Unit, far end radio frequency head, in which:
The optic tunable filter for receiving the downstream wavelength signal after passing through optical splitter, and considers and selects carrying respective cell
The wavelength signals of site information；
The photoreceiver considers the downstream wavelength signal selected for receiving the detection optic tunable filter；
The intermediate frequency radio frequency front-end unit, the wavelength signals for being detected to the photoreceiver be filtered and up-conversion at
Reason；
The far end radio frequency head, for receiving the intermediate frequency radio frequency front-end unit filtering and the wavelength signals after up-conversion, and will
The optical sender of the distal end cells is loaded into after wavelength signals progress down coversion, filtering；
The optical sender receives the wavelength signals after the far end radio frequency head down coversion, filtering processing, and utilizes wavelength-division
The wavelength signals are sent back central machine room by the mode of multiplexing.
2. the wireless forward pass Transmission system according to claim 1 based on wavelength-selective switches, which is characterized in that
BBU Base-Band Processing pond, including multiple baseband processing units, for realizing the dynamic allocation of base-band resource and shared；
The optical sender pond, including multiple optical senders for realizing the dynamic dispatching to optical sender and are shared；
The photoreceiver pond, including multiple photoreceivers for realizing the dynamic dispatching to photoreceiver and are shared；
The wavelength division multiplexer, the baseband signal sent for coupling the optical sender pond；
The downstream wavelength selection switch, for carrying out multiple port wavelength distribution according to downstream wavelength signal, and the wavelength selects
The downstream wavelength signal for selecting multiple output ports extraction of switch can carry one or more distal end cells simultaneously
Information；
The coupler, the upstream wavelength signal sent for coupling multiple distal end cells；
Upstream wavelength signal is carried out multiport wave for the output signal according to coupler by the upstream wavelength selection switch
It is sent into different photoreceivers after long distribution, realizes that the photoreceiver in the photoreceiver pond can receive detection one simultaneously
Or multiple upstream wavelength signals；
Upstream wavelength signal is delivered to coupler for changing the transmission direction of upstream wavelength signal by the circulator.
3. a kind of wireless forward pass transmission method based on wavelength-selective switches, which comprises the steps of:
Step 1: the central machine room that building can be realized flow scheduling and baseband capabilities are shared；
Step 2: the multiple cells groups comprising several distal end cells of building；
Step 3: the central machine room is interconnected by branched system optical fiber and multiple cells groups；In branched system optical fiber
Increase several optical splitters, and the corresponding optical splitter of each described cells group on route；
Wherein, the signal carried in the wireless forward pass transmission method described based on wavelength-selective switches is simulation orthogonal frequency division multiplexing
With intermediate-freuqncy signal, and the simulation orthogonal frequency division multiplexing intermediate-freuqncy signal generates format and defers to wireless protocols and standard, wherein generating
Signal occupy the different IF region of frequency domain respectively, also there are certain protection intervals between different IF, i.e., in identical frequency band
It inside include several analog if signals；
The step 1 includes: building BBU Base-Band Processing pond, optical sender pond, photoreceiver pond, and by BBU Base-Band Processing pond
Output end is connected by the optical sender pond with the input terminal of wavelength division multiplexer, and the output end of the wavelength division multiplexer is connected
To the input terminal of downstream wavelength selection switch, by the multiple output ports and multiple circulators of downstream wavelength selection switch
First port connects one by one；Multiple input ports of the third port of multiple circulators and coupler are connected one by one, it will
The input terminal of the output end connection upstream wavelength selection switch of the coupler, by the multiple defeated of upstream wavelength selection switch
Exit port is connected by photoreceiver pond with the input terminal in BBU Base-Band Processing pond；The then second port structure of multiple circulators
At several input/output ports of the central machine room；
The step 2 includes:
Step 2.1: utilizing optic tunable filter, photoreceiver, optical sender, intermediate frequency radio frequency front-end unit, far end radio frequency head structure
Build several distal end cells；
Step 2.1.1: carrying out worry choosing using downstream wavelength signal of the optic tunable filter to input, obtains carrying respective cell station
The wavelength signals of point information；
Step 2.1.2: the detection optic tunable filter is received using photoreceiver and considers the downstream wavelength signal selected；
Step 2.1.3: being filtered using the wavelength signals that intermediate frequency radio frequency front-end unit detects the photoreceiver and upper change
Frequency is handled；
Step 2.1.4: receiving the wavelength signals after the intermediate frequency radio frequency front-end unit filtering and up-conversion using far end radio frequency head,
And the optical sender for the distal end cells being loaded into after wavelength signals progress down coversion, filtering；
Step 2.1.5: receiving the wavelength signals after the far end radio frequency head down coversion, filtering processing using optical sender, and
The wavelength signals are sent back into central machine room in the way of wavelength-division multiplex；
Step 2.2: several distal end cells being grouped, multiple cells groups are constituted.
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| CN102378186A (en) * | 2011-11-21 | 2012-03-14 | 中兴通讯股份有限公司 | Base station resource sharing system and method |
| CN104066018A (en) * | 2014-06-16 | 2014-09-24 | 上海交通大学 | Base band migration system for wireless fronthaul of passive optical network |
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| CN102378186A (en) * | 2011-11-21 | 2012-03-14 | 中兴通讯股份有限公司 | Base station resource sharing system and method |
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