CN103179603B - A kind of city wireless network channel emulation test system and method - Google Patents
A kind of city wireless network channel emulation test system and method Download PDFInfo
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Abstract
The invention discloses a kind of city wireless network channel emulation test system and method.System includes：N base band data Replica Selection module and n channelizing processing module, wherein：Each base band data Replica Selection module is used to the upstream baseband data inputted from multiple optical interface links being copied into n roads, and n channelizing processing module is inputted respectively；Data after the channelizing processing of n channelizing processing module output of downlink reception, therefrom selection is exported with optical interface link quantity identical multiple signals；Each channelizing processing module is used to carry out the n roads base band data of up input following handle：Selected section base band data carries out large scale decline computing and multipath fading computing, multipath delay caching is carried out to the base band data after decline computing, it is descending after being superimposed to all base band datas for being output to same base band data Replica Selection module to export to base band data Replica Selection module.The present invention realizes large-scale radio network information channel emulation testing, and testing cost is low.
Description
Technical field
The present invention relates to wireless communication field, and in particular to city wireless network wireless channel simulator test system and side
Method.
Background technology
Wireless channel is a kind of time varying channel, when wireless signal is by this channel, and the decline shown has：1 be with
Signal transmission distance changes and the transmission loss produced and disperse；2 be due to landform, building and other barriers in transmission environment
Hinder thing to the shadow fading caused by the stop of electromagnetic signal；3 be wireless signal on the transmit path by peripheral obstacle
Reflection, diffraction and scattering so that it reaches the superposition that receiver is the multiple signals transmitted from multiple paths, causes signal connecing
The amplitude of receiving end, phase and multipath fading caused by the random change of arrival time；4 be receiving terminal in signal transmission direction
Movement and the Doppler frequency shift that produces so that receive extension of the signal in frequency domain, produce additional FM noise, receive
Distorted signals.
When studying wireless channel, wireless channel is generally divided into two kinds of transmission moulds of large scale decline and multipath fading
Type.Large scale fading model is used to describe the change in signal strength in the long range between transmitter and receiver, including transmission is damaged
Consumption, disperse and shadow fading；Multipath fading model is used for the quick change for describing the signal intensity in short distance and short time,
Including multipath fading and Doppler frequency shift.
Wireless Telecom Equipment manufacturer when producing Wireless Telecom Equipment, it is necessary to carry out extensive testing under true environment,
It just can guarantee that the reliable and stable of equipment.But the test of true environment needs to build substantial amounts of base station equipment and large-scale sport car road
Survey, testing cost is high and efficiency is low.And wireless channel environment is ever-changing, it is difficult often reproduction an anomaly occur,
Even if repeating drive test for a long time, it is also difficult to find extreme wireless scene and carry out pressure test to equipment.
The content of the invention
It is real the technical problem to be solved in the present invention is to provide a kind of city wireless network channel emulation test system and method
Now large-scale radio network information channel emulation testing, and testing cost is low.
In order to solve the above technical problems, the invention provides a kind of city wireless network channel emulation test system, including：
N base band data Replica Selection module and n channelizing processing module, wherein：
Each base band data Replica Selection module, in up direction, the base band number that will be inputted from multiple optical interface links
According to n roads are copied into, n channelizing processing module is inputted respectively；In down direction, receive what n channelizing processing module was exported
Data after channelizing processing, therefrom selection is exported with optical interface link quantity identical multiple signals；
Each channelizing processing module, channelizing processing is carried out for the n roads base band data to up input, including：From
Selected section base band data carries out large scale decline computing and multipath fading computing in the base band data of input, to decline computing
Base band data afterwards carries out multipath delay caching, and all base band datas for being output to same base band data Replica Selection module are folded
Plus rear descending output is to base band data Replica Selection module.
Further, the system also includes n base band data AM access module, and each base band data AM access module correspondence connects
A base band data Replica Selection module is connect, each base band data AM access module is used to receive by optical interface link in up direction
The base band data of equipment to be tested, carries out input after speed conversion corresponding with the base band data AM access module by the base band data
Base band data Replica Selection module, and for receiving the base band number of base band data Replica Selection module output in down direction
According to output after progress speed conversion.
Further, the channelizing processing module is realized by logical operation circuit, and the logical operation circuit includes defeated
Enter antenna data selector, x large scale decline multiplier, y multipath fading multiplier, y multidiameter delay buffer area, with
And output antenna data selector, y=kx, k ∈ [3,18], wherein：
The input antenna data selector, for the base band data for selecting to need to carry out channelizing processing, inputs x respectively
Individual large scale decline multiplier；
The large scale decline multiplier, large scale decline computing is carried out for the base band data to input, including：Should
The base band data of input is multiplied by the corresponding large scale fading factor of the base band data, the base band data after the computing that declined to large scale
Y multipath fading multiplier is inputted after being replicated respectively；
The multipath fading multiplier, multipath fading computing is carried out for the base band data to input, including：Should
The base band data of input is multiplied by the corresponding multipath fading factor of the base band data, inputs corresponding multidiameter delay buffering area；
The multidiameter delay buffer area, for the base band data after the multipath fading computing by input by given delay
Parameter carries out delay buffer and the output antenna data selector is inputted after merging；
The output antenna data selector, it is same to being output to for receiving base band data from y multidiameter delay buffering area
The base band data of one base band data Replica Selection module is overlapped, and is exported and is superimposed to corresponding base band data Replica Selection module
Data afterwards.
Further, the system also includes n fading parameter management module, and it is used to handle mould for corresponding channelizing
Large scale decline multiplier in block provides large scale fading factor, is the multipath fading in corresponding channelizing processing module
Multiplier provides the multipath fading factor, and provides delay for the multidiameter delay buffer area in corresponding channelizing processing module
Parameter.
Further, the fading parameter management module is realized by digital signal processor.
Further, n >=2.
Further, the n=9.
In order to solve the above technical problems, the invention provides a kind of city wireless network channel emulation test method, including：
The base band data of same base band data Replica Selection module is input to from multiple optical interface links, is answered by the base band data
Selecting module processed is copied into n roads, and n channelizing processing module is inputted respectively；
Each channelizing processing module selected section base band data from the n roads base band data of input carries out large scale decline
Computing and multipath fading computing, carry out multipath delay caching, to being output to same base band to the base band data after decline computing
It is descending after all base band datas superposition of data duplication selecting module to export to corresponding base band data Replica Selection module；
Each base band data Replica Selection module receives the number after the channelizing processing of n channelizing processing module output
According to therefrom selection is exported with optical interface link quantity identical multiple signals.
Further, before base band data Replica Selection module replicates base band data, methods described also includes：
The base band data inputted from multiple optical interface links is inputted again after first carrying out speed conversion through base band data AM access module
Base band data Replica Selection module；
The base band data Replica Selection module selection is exported to base band number with optical interface link quantity identical multiple signals
According to AM access module, the base band data AM access module carries out exporting after speed conversion to the base band data received.
Further, the channelizing processing module is used to carry out large scale decline computing in the following ways：This is defeated
The base band data entered is multiplied by the corresponding large scale fading factor of the base band data；
The channelizing processing module is used to carry out multipath fading computing in the following ways：By the base band number of the input
According to being multiplied by the corresponding multipath fading factor of the base band data；
The channelizing processing module is used to carry out multipath delay caching in the following ways：To the base band data of the input
Delay buffer and merging are carried out by given delay parameter.
By the invention it is possible to the wireless network environment in the whole city of experiment lab simulation, to various wireless communication place where Taoist rites are performed
Scape carries out emulation broadcasting, playback, provides sufficient test environment for wireless device, greatly reduces the field testing of equipment vendor
Cost.Compared to the prior art, provided herein is emulation test method and system emulation popularization it is a lot, existing channel is imitated
True is usually single cell list UE, or the several UE of several cells channel circumstance, and the simulation scale of this paper method of testings and system
Maximum support 576 cells × 576UE networking scale is brought up to, the wireless channel network environment in whole city can be simulated, can
To carry out the test of simcity external field environment to base station and terminal device in laboratory, the ring of pilot office is provided indoors
Border.Simultaneously because using DSP (Digital Signal Processor, digital signal processor) and FPGA (Field
Programmable Gate Array, field programmable gate array) framework directly carries out channelizing processing and dry to base band data
Synthesis is disturbed, one side cost of implementation is low, on the other hand can be applicable different wireless network standards, there is very strong versatility.
Brief description of the drawings
Fig. 1 is the analogue system structural representation of the embodiment of the present invention 1；
Fig. 2 is the analogue system structural representation of 72 equipment to be tested of maximum support of the embodiment of the present invention 1；
Fig. 3 is the channelizing processing module FPGA internal structure schematic diagrams of the embodiment of the present invention 1；
Fig. 4 is the analogue system structural representation for including fading parameter management module；
Fig. 5 is the analogue system structural representation that the embodiment of the present invention 2 includes base band data AM access module；
Fig. 6 is the CPRI optical port aggregation infrastructure schematic diagrames of base band data AM access module 10M2 antennas；
Fig. 7 is the CPRI optical port aggregation infrastructure schematic diagrames of base band data AM access module 10M4 antennas or 20M2 antennas；
Fig. 8 is the CPRI optical port aggregation infrastructure schematic diagrames of base band data AM access module 10M8 antennas or 20M4 antennas；
Fig. 9 is the channelizing processing module FPGA internal structure schematic diagrams of the embodiment of the present invention 2.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Embodiment 1
As shown in figure 1, including with lower module：N base band data Replica Selection module and n channelizing processing module, its
In：
Each base band data Replica Selection module, in up direction, the base band number that will be inputted from multiple optical interface links
According to n roads are copied into, n channelizing processing module is inputted respectively；In down direction, receive what n channelizing processing module was exported
Data after channelizing processing, therefrom selection is exported with optical interface link quantity identical multiple signals；
Each channelizing processing module, channelizing processing is carried out for the n roads base band data to up input, including：From
Selected section base band data carries out large scale decline computing and multipath fading computing in the base band data of input, to decline computing
Base band data afterwards carries out multipath delay caching, and all base band datas for being output to same base band data Replica Selection module are folded
Plus rear descending output is to base band data Replica Selection module.
Due to needing to carry out substantial amounts of multiplication process in wireless channel simulation, it is therefore desirable to replicated using multiple base band datas
Selecting module and channelizing processing module realize that specific the base band data Replica Selection module and channelizing processing module can adopt
Realized with logical operation circuit.
Fig. 2 is the schematic diagram that base band data Replica Selection module and channelizing processing module are realized with FPGA, it is illustrated that structure
Base station cell and/or the UE (terminal) of the antennas of 20M 8 can be simulated, maximum supports 72 base station cells and/or terminal.
Above-mentioned n >=2.It is preferred that n=9.N=9 in Fig. 2, that is, have at 9 base band data Replica Selection modules and 9 channelizings
Module is managed, each module is realized that wherein base band data Replica Selection module is respectively FPGA-a0~FPGA-a8 by FPGA, believed
Road processing module is respectively FPGA-b0~FPGA-b8.
Illustrate the operation of base band data Replica Selection module by taking FPGA-a0 as an example, the FPGA-a0 receives 8 road optical fiber inputs
Base band data, by 8 roadbed band data duplication into 9 parts of difference input channel processing module FPGA-b0~FPGA-b8.
FPGA-a1~FPGA-a8 operation same FPGA-a0, each FPGA can parallel processing independently of each other.
Illustrate the operation of channelizing processing module by taking FPGA-b0 as an example, the FPGA-b0 receives 8 × 9 totally 72 roadbed band numbers
According to respectively to the progress channelizing processing of every road base band data.FPGA-b0 internal structure is as shown in figure 3, FPGA-b1~FPGA-
B8 internal structure same FPGA-b0, each FPGA can parallel processing independently of each other.
As shown in figure 3, each channelizing processing module includes input antenna data selector, x large scale decline multiplication
Device, y multipath fading multiplier, y multidiameter delay buffer area and output antenna data selector, y=kx, k ∈ [3,18],
Wherein：
The input antenna data selector, for the base band data for selecting to need to carry out channelizing processing, inputs x respectively
Large scale decline multiplier；Sequence number for example, which can be arranged, according to base band data from input link selects current time to need to be believed
The base band data of roadization processing；
Large scale decline multiplier, large scale decline computing is carried out for the base band data to input, including：This is defeated
The base band data entered is multiplied by the corresponding large scale fading factor of the base band data, and the base band data after the computing that declined to large scale enters
Row inputs y multipath fading multiplier respectively after replicating；
The multipath fading multiplier, multipath fading computing is carried out for the base band data to input, including：This is defeated
The base band data entered is multiplied by the corresponding multipath fading factor of the base band data, inputs corresponding multidiameter delay buffering area；
The multidiameter delay buffer area, for the base band data after the multipath fading computing by input by given delay ginseng
Number carries out delay buffer and inputs the output antenna data selector after merging；Specifically, way of base band data etc. after merging
In the number x of the way of the input selected base band data of antenna data selector, i.e. large scale decline multiplier；
The output antenna data selector, it is same to being output to for receiving base band data from y multidiameter delay buffering area
The base band data of base band data Replica Selection module is overlapped, to after the output superposition of corresponding base band data Replica Selection module
Data.Specifically, the quantity of data is equal to the quantity of input antenna data selector received data after adding up.
For the emulation platform of scale shown in Fig. 2 in the present embodiment, FPGA-b0 receives base band data inside 72 tunnels, according to
The base band data arrangement sequence number selection present clock moment needs to carry out the base band data of channelizing processing, input antenna data selection
Device selects maximum 256 base band datas to carry out Channel Processing from 72 links.Channel treatment processes press pipeline organization successively
It is large scale decline, multipath fading, multidiameter delay, refers to temporally put during multidiameter delay and cached, time point is by time delay
Parameter is determined.Finally output antenna selector enters to all base band datas for being output to same base band data Replica Selection module
Row additional combining, obtains the base band data after final channelizing and is sent to corresponding output antennal interface.
Preferably, the logical operation circuit in each channelizing processing module carries out the big chi used during channelizing processing
It can be stored in advance in the logical operation to spend the channel fading parameters such as fading factor, the multipath fading factor and delay parameter
In circuit, it can also be provided by external module.For example by outside fading parameter management module according to the channel currently emulated
Scape, real-time update channel fading parameters, as shown in Figure 4.The fading parameter management module can be realized using DSP.Correspondence is above-mentioned
Example can be realized using 9 DSP, the FPGA in one Channel Processing module of each DSP correspondences, by CPRI interfaces to FPGA
Real-time update fading factor (including large scale fading factor and multipath fading factor) and multidiameter delay parameter.Wherein, big chi
Spend fading factor support by outfield drive test gather obtain or by standard channel model produce acquisition, the multipath fading factor and when
Prolonging parameter can be according to standard channel model, and using the Channel Modeling mode based on statistics, i.e. spatial coherence mimo channel is by only
The spatial correlation matrix joint that vertical fading MIMO channel and statistics are obtained is produced.
Assuming that the antenna number of base station side is M, the antenna number of end side is N, hmnRepresent m-th of transmitting antenna and n-th
The link of individual reception antenna composition, each hmnIt is made up of L distinguishable paths (or L clusters), it is inseparable by P per cluster
" sub- footpath " constitute.Therefore, Frequency-Selective MIMO Channel can be modeled as：
Wherein, L is sub- footpath number, τlIt is sub- footpath l time delay, t is current time, Table
Show n-th of reception antenna, m-th of transmitting antenna constitutes the channel fading coefficient in l-th of separable path of link, ownedSymbol
Close the multiple Gauss distribution of zero-mean.
Assumed based on such：The correlation properties of antenna for base station are unrelated with terminal antenna；The correlation properties of terminal antenna with
Antenna for base station is unrelated.Then antenna for base station m1、m2Coefficient correlation and terminal antenna n1、n2Coefficient correlation be expressed as
Wherein,<□>Represent " second moment " computing or covariance computing.It can thus be concluded that the Correlation Moment of base station side and end side
Battle array (for each separate footpath for) be
The fading correlation matrix in the separable path of l-th of base station side and end side is respectively： For AOA,Angle spread； For AOD,Angle spread.
There is correlation matrix RMSAnd RBS, it is possible to calculate the mimo channel with certain correlated characteristic.
Optical interface link described above refers to that (Common Public Radio Interface, general public wireless connects CPRI
Mouthful) optical interface link.
Embodiment 2
In order to support more multiple cell and terminal, the present embodiment increases n base band data on the basis of Fig. 1 of embodiment 1 and Fig. 2
AM access module, as shown in Figure 5.
Each base band data AM access module correspondence one base band data Replica Selection module of connection, each base band data access
Module is used to connect equipment to be tested (such as base station and/or terminal) by optical interface link in up direction, receives to be tested set
Standby base band data, carries out input after speed conversion by the base band data of the up input of equipment to be tested and is accessed with the base band data
The corresponding base band data Replica Selection module of module, and the base band exported for downlink reception base band data Replica Selection module
Data, exported after speed conversion.
The base band data AM access module use standard CPR I intelligent acess, optical port speed support 2.4576G, 3.072G,
4.9152G or 6.144G, supports all MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) antennas
Configuration.Maximum access optical port number is up to 576, therefore using after the AM access module, and the networking scale of the present embodiment analogue system can
Up to 576 cells × 576UE, equivalent to the scale of the wireless channel network environment of a medium-sized city.
To ensure 576 cells of emulation platform × 576UE total exchange structure, the base band data Replica Selection module can be adopted
With FPGA (preferably 9) realize, each FPGA by the optical interface link data duplication of input into many parts, each channelizing processing module
FPGA correspondences are a so that each tunnel optical port base band data inputs of channelizing processing module FPGA Dou Shi 576.
The FPGA operative scenarios in several base band data AM access modules are described below, emulation testing described herein is illustrated with this
The network environment that system can be simulated.
Fig. 6 is the CPRI optical ports convergence schematic diagram of the antennas of 10M 2, and for each FPGA, base band data is divided into 8 groups, every group
CPRI optical fiber pools 1 internal 10G link outside 8 2.5G, for whole emulation test system, and maximum support 8 × 8 ×
The base band data access of 9 totally 576 equipment to be tested.
Fig. 7 is the CPRI optical ports convergence schematic diagram of the antennas of 10M 4 or the antennas of 20M 2, for each FPGA, base band data point
Into 8 groups, every group pools 1 internal 10G link by 4 2.5G outsides CPRI optical fiber, maximum for whole emulation test system
Support the base band data access of 8 × 4 × 9 totally 288 equipment to be tested.
Fig. 8 is the CPRI optical ports convergence schematic diagram of the antennas of 10M 8 or the antennas of 20M 4, for each FPGA, base band data point
Into 8 groups, every group pools 1 internal 10G link by 2 4.9G outsides CPRI optical fiber, maximum for whole emulation test system
Support the base band data access of 8 × 2 × 9 totally 144 equipment to be tested.
To the scene of the antennas of 20M 8, because base band data optical fiber is directly 10G, therefore just connect without the need for base band data
Enter module, and base band data optical fiber is directly connected to base band data Replica Selection module, now platform maximum supports 72 bases
Cell of standing and the connection of UE terminals, the system as shown in Fig. 2 or 4.
Structure, channel fading parameters shown in Fig. 3 in FPGA structure be the same as Example 1 in channelization block in the present embodiment
It can also be provided by fading parameter management module, as shown in Figure 9.
Fpga chip in above-described embodiment can select the XC7VX690T of Xilinx companies, and the fpga chip has 80
Road Serdes (SERializer/DESerializer, series connection/deserializer) interface, all supports below 13G CPRI optical fiber to connect per road
Connect.Access FPGA is converged to internal 10G link to base band data by CPRI frame structures, and can be adapted to different mimo antenna CPRI
Optical fiber interface.
Base band data Replica Selection module realizes that the duplication input of base band data inside 10G is exported with selection, can also be by 9
Piece XC7VX690T fpga chips realize that each FPGA 80 road Serdes interfaces are all worked with 10G speed.In up side
The base band data after the convergence of 8 tunnels is received to, each FPGA, then is copied into 9 parts, is respectively outputted to 9 channel processing module FPGA；
In down direction, each FPGA receives the base band data after the processing of 72 path channels, selects 8 tunnels and is output to as final result
Access FPGA.
It is above the specific implementation use-case of the present invention, utilizes DSP+FPGA frameworks, one large-scale wireless network letter of composition
Road emulation platform, maximum supports the networking scale of the terminal of 576 cells × 576, is adapted to the following wireless network environment in medium-sized city
Scenario simulation, and suitable for different wireless network standards.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also use one or more integrated circuits to realize.Accordingly
Each module/unit in ground, above-described embodiment can be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Various corresponding changes and deformation, but these corresponding changes and change ought can be made according to the present invention by knowing those skilled in the art
Shape should all belong to the protection domain of appended claims of the invention.
Claims (10)
1. a kind of city wireless network channel emulation test system, including：N base band data Replica Selection module and n channel
Change processing module, wherein：
Each base band data Replica Selection module, in up direction, the base band data inputted from multiple optical interface links to be answered
N roads are made, n channelizing processing module is inputted respectively；In down direction, the channel of n channelizing processing module output is received
Data after change processing, therefrom selection is exported with optical interface link quantity identical multiple signals；
Each channelizing processing module, channelizing processing is carried out for the n roads base band data to up input, including：From input
Base band data in selected section base band data carry out large scale decline computing and multipath fading computing, after decline computing
Base band data carries out multipath delay caching, after being superimposed to all base band datas for being output to same base band data Replica Selection module
It is descending to export to base band data Replica Selection module.
2. the system as claimed in claim 1, it is characterised in that：
The system also includes n base band data AM access module, each base band data AM access module correspondence one base band number of connection
According to Replica Selection module, each base band data AM access module is used to receive equipment to be tested by optical interface link in up direction
Base band data, carries out input base band data corresponding with the base band data AM access module after speed conversion by the base band data and answers
Selecting module processed, and for receiving the base band data of base band data Replica Selection module output in down direction, carry out speed
Exported after conversion.
3. system as claimed in claim 1 or 2, it is characterised in that：
The channelizing processing module is realized that the logical operation circuit includes input antenna data selection by logical operation circuit
Device, x large scale decline multiplier, y multipath fading multiplier, y multidiameter delay buffer area, and output antenna data
Selector, y=kx, k ∈ [3,18], wherein：
The input antenna data selector, for the base band data for selecting to need to carry out channelizing processing, is inputted x big respectively
Yardstick decline multiplier；
The large scale decline multiplier, large scale decline computing is carried out for the base band data to input, including：This is inputted
Base band data be multiplied by the corresponding large scale fading factor of the base band data, to large scale decline computing after base band data carry out
Y multipath fading multiplier is inputted after duplication respectively；
The multipath fading multiplier, the base band data after the computing that declined for the large scale to input carries out multipath fading
Computing, including：Base band data after the large scale decline computing of the input is multiplied by the corresponding multipath fading of the base band data
The factor, inputs corresponding multidiameter delay buffer area；
The multidiameter delay buffer area, for the base band data after the multipath fading computing by input by given delay parameter
Carry out delay buffer and the output antenna data selector is inputted after merging；
The output antenna data selector, for receiving base band data from y multidiameter delay buffer area, to being output to same base
Base band data with data duplication selecting module is overlapped, to after the output superposition of corresponding base band data Replica Selection module
Data.
4. system as claimed in claim 3, it is characterised in that：
The system also includes n fading parameter management module, and it is used for for the large scale in corresponding channelizing processing module
The multiplier that declines provides large scale fading factor, provides small for the multipath fading multiplier in corresponding channelizing processing module
Yardstick fading factor, and provide delay parameter for the multidiameter delay buffer area in corresponding channelizing processing module.
5. system as claimed in claim 4, it is characterised in that：
The fading parameter management module is realized by digital signal processor.
6. the system as described in claim 1 or 2 or 4 or 5, it is characterised in that：
N >=2.
7. system as claimed in claim 6, it is characterised in that：
The n=9.
8. a kind of city wireless network channel emulation test method, including：
The base band data of same base band data Replica Selection module is input to from multiple optical interface links, is replicated and selected by the base band data
Select module and be copied into n roads, n channelizing processing module is inputted respectively；
Each channelizing processing module selected section base band data from the n roads base band data of input carries out large scale decline computing
With multipath fading computing, multipath delay caching is carried out to the base band data after decline computing, to being output to same base band data
It is descending after all base band datas superposition of Replica Selection module to export to corresponding base band data Replica Selection module；
Each base band data Replica Selection module receives the data after the channelizing processing of n channelizing processing module output, from
Middle selection is exported with optical interface link quantity identical multiple signals.
9. method as claimed in claim 8, it is characterised in that：
Before base band data Replica Selection module replicates base band data, methods described also includes：
The base band data inputted from multiple optical interface links inputs base band again after first carrying out speed conversion through base band data AM access module
Data duplication selecting module；
The base band data Replica Selection module selection is exported to base band data with optical interface link quantity identical multiple signals to be connect
Enter module, the base band data AM access module carries out exporting after speed conversion to the base band data received.
10. method as claimed in claim 8 or 9, it is characterised in that：
The channelizing processing module is used to carry out large scale decline computing in the following ways：The base band data of the input is multiplied
With the corresponding large scale fading factor of the base band data；
The channelizing processing module is used to carry out multipath fading computing in the following ways：The large scale of the input is declined
Base band data after computing is multiplied by the corresponding multipath fading factor of the base band data；
The channelizing processing module is used to carry out multipath delay caching in the following ways：To the base band data of the input by giving
Fixed delay parameter carries out delay buffer and merging.
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