CN105337677B - A kind of method and apparatus of the extensive mimo channel simulation of high bandwidth - Google Patents
A kind of method and apparatus of the extensive mimo channel simulation of high bandwidth Download PDFInfo
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- CN105337677B CN105337677B CN201510791889.4A CN201510791889A CN105337677B CN 105337677 B CN105337677 B CN 105337677B CN 201510791889 A CN201510791889 A CN 201510791889A CN 105337677 B CN105337677 B CN 105337677B
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Abstract
The invention discloses a kind of method and apparatus of the extensive mimo channel simulation of high bandwidth, which is made of several two input of simulation, two output channel basic units.The channel fading simulator for needing input signal to be simulated that can enter this unit carries out channel simulation, can also be relayed to other units by transmission channel cascade and be simulated；Output signal after simulation can be converted into the base-band analog signal after simulation by digital analog converter, can also be merged by receiving channel cascaded-output intermediate result for next stage unit.Furthermore the basic unit provides synchronization for the transmission of each circuit-switched data signal, realizes single module and system-level alignment of data by synchronous and timing module.The simulation for constructing extensive mimo channel can export method made of the basic unit cascading of channel simulation, interconnection scheme simple and flexible with MxN two input two, it is easy to accomplish, internal logic and interface are unified, facilitate the extensive mimo channel of simulation.
Description
Technical field
The present invention relates to a kind of extensive multiple-input and multiple-output of wireless communication and testing field more particularly to high bandwidth letters
The analogy method in road；Applied to wireless communication system testing field.
Background technique
Wireless channel is complicated and changeable signal physical channel, and there is the influences such as multipath fading, flat decline, noise are logical
Believe the unfavorable factor of performance, and these are all that communication systems have to emphasis and consider the problems of, the simulation of channel is guarantee
Under same communication protocol and system system, smooth communication must between the terminal of different manufacturers exploitation and the system equipment of more producers offer
Indispensable testing process.It can also be controlled using channel simulator, change channel parameter, and then understand communication equipment or communication
Performance of means under the conditions of different channels.MIMO radio channel simulator can save the development of LTE-A mobile communication equipment
Expense increases flexibility when research and development, while shortening the lead time, reduce base station and terminal device overall development process and
It interconnects the testing time, reduces the time of field testing, to raising and guarantee that the interconnection and interflow of not homologous ray, manufacturer terminal has
Very positive effect.
The simulation of characteristics of radio channels can be divided into numerical portion simulation and analog portion simulation.Digital baseband signal simulation
It is mainly made of Digital Signal Processing, it is the integrated application of igh-speed wire-rod production line technology and Computer Applied Technology.Radio-frequency part
The simulation divided is mainly realized by analog circuit, and the Up/Down Conversion of signal and the effect of amplification are completed.The crucial portion of channel simulator
Part is the Ditital multichannel diameter fading characteristic simulator using discrete type tapped delay line as core.Its a large amount of number of realization consumption
Word logical resource.The signal bandwidth of simulation is wider, and digital signal acquiring speed is faster, and throughput is also higher.M is emitted
The simulation of the multi-antenna channel of the N number of receiving antenna of antenna, the digital multipath fading device needed as MxN times increases, and with
N is also multiplied by the growth of receiving antenna number, throughput when signal merges.Therefore working as needs logical sub-channel number to be simulated
Or when the increase of dual-mode antenna number, the ability and system throughput of signal processing all suffer from great challenge.
Mimo channel is simulated, generalling use power divider etc. point needs signal to be simulated, then pass through down coversion,
Digital simulation is carried out by the fading simulator of each subchannel after analog/digital conversion, output signal turns using digital-to-analog
It changes, signal merging is carried out by power combiner again after up-conversion.However, each branch of broadband analog signal distributes and merges ratio
Compared with it is difficult to ensure that accuracy and consistency, to cause the deviation of each branch simulation.In recent years, gradually development is in base band logarithm
The method of word signal progress branch and combining.But as signal bandwidth is more and more wider (bandwidth is more than 100MHz), MIMO's is defeated
It is more and more (transmitting/receiving 256, antenna) to enter to export antenna, especially extensive MIMO (Massive Multi-Input-
Multi-Output, Massive MIMO) application of the technology in 5G communication, the merging of analog signal and transmission throughput will more
Come higher, and the timing demands on its each road are higher and higher.
Summary of the invention
It is this to be based on the purpose of the present invention is to provide a kind of method and device of the extensive mimo channel simulation of high bandwidth
Distributed pipeline processing scheme, complexity is low, and it is convenient to realize, framework is easy to extend, and it is roomy to well adapt to the following high band
The application of scale antenna.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of device of the extensive mimo channel simulation of high bandwidth, including several two input of simulation, two output channels are basic
Unit, single two input of simulation, two output channel basic unit includes the first analog-digital converter, the second analog-digital converter, the first hair
Channel cascade input, the cascade input of the second transmission channel are penetrated, the first receiving channel cascades input, and the cascade of the second receiving channel is defeated
Enter, Gaussian white noise generator, external definition and synchronization module；First analog-digital converter and the cascade of the first transmission channel are defeated
The output end entered connects the first multiplexer, and the output end of the first multiplexer connects the first demultplexer, more than first
Distributor is connected separately with the first subchannel fading simulator, the second subchannel fading simulator and the cascade of the first transmission channel
The output end of output, the first subchannel fading simulator and the second subchannel fading simulator connects first adder and second respectively
Adder, the output of first adder terminate third adder, and the output of second adder terminates the 4th adder；Described second
Analog-digital converter and the second transmission channel cascade input output end connect the second multiplexer, the second multiplexer it is defeated
Outlet connects the second demultplexer, and the second demultplexer is connected separately with third subchannel fading simulator, the 4th son letter
Road fading simulator and the second transmission channel cascaded-output, third subchannel fading simulator and the 4th subchannel fading simulator
Output end connect first adder and second adder respectively；First receiving channel cascade input connection third adder, third
The output end of adder connects fifth adder, and fifth adder connects third demultplexer, and third demultplexer connects respectively
First digital analog converter and the first receiving channel cascaded-output；The cascade input of second receiving channel connects the 4th adder, and the 4th adds
Musical instruments used in a Buddhist or Taoist mass connects the 6th adder, and the 6th adder connects the 4th demultplexer, and the 4th demultplexer connects the second digital-to-analogue conversion respectively
Device and the second receiving channel cascaded-output；Gaussian white noise generator connects fifth adder and the 6th adder respectively；First hair
It penetrates channel cascaded-output and the second transmission channel cascaded-output connects next two input of simulation, two output channel basic unit respectively
The first transmission channel cascade input and the second transmission channel cascade input；First receiving channel cascaded-output and the second reception are logical
Road cascaded-output connects the first receiving channel cascade input and the of next two input of simulation, two output channel basic units respectively
The cascade input of two receiving channels.
The external definition of several two input of simulation, two output channel basic units and synchronization module are all connected with system clock
With timing module.
A kind of method of the extensive mimo channel simulation of high bandwidth, includes the following steps:
A) two input of simulation, two output channel basic unit is using two-way input and two-way output；
B) input signal is the base band data acquired using high-speed AD converter after broadband signal down coversion, either
Input traffic is cascaded by the transmitting antenna that HSSI High-Speed Serial Interface transmits, is selected wherein using the multiplexer of Digital Logic
One of；
First via base-band data stream is replicated three parts by the demultplexer c) passed through, and copy is transmitted to the first son letter
Road fading simulator is simulated, and second part of copy is transmitted to the second subchannel fading simulator and is simulated, third part copy
Next module is transmitted to by HSSI High-Speed Serial Interface to be simulated；
D) using the demultplexer of Digital Logic by three parts of data flow replication of the second roadbed band, copy is transmitted to
Third subchannel fading simulator is simulated, and second part of copy, which transmits the 4th subchannel fading simulator, is simulated, third
Part copy is transmitted to next module by HSSI High-Speed Serial Interface and is simulated；
E) external definition and synchronization module, synchronous first subchannel fading simulator output, the decline of third subchannel are utilized
Simulator output and the first receiving channel cascade input data, and are added and obtain first passage analog output signal, likewise, together
Walk the output of the second subchannel fading simulator, the output of the 4th subchannel fading simulator and the second receiving channel cascade input number
According to, and be added and obtain second channel analog output signal；
F) the independent incoherent white Gaussian noise of analog output signal superposition in two channels；
G) output signal in last each channel is transmitted to radio-frequency module and is carried out by digital analog converter Analog Baseband data
Frequency conversion, or the next stage receiving channel being transmitted to by HSSI High-Speed Serial Interface.
For the road 2M input signal, the mimo channel of the road 2N output signal is simulated, defeated using N number of two input two of simulation of M x
Channel basic unit is extended out, and extended mode is as follows:
(1) road 2M input signal passes through analog-digital converter in two input of M simulation, two output channel basic unit respectively and adopts
Integrate as baseband digital signal；
(2) the transmission channel cascaded-output of the road 2M input signal is respectively connected to two input of the simulation of second level M, two output
2M transmission channel of channel basic unit cascades input, the hair of two input of the simulation of second level M, two output channel basic unit
It penetrates channel cascaded-output and is then connected to the third level, so sequence is expanded to N grades；
(3) there is two input of M simulation, two output channel basic unit in every level-one, it is defeated to connect first simulation, two input two
The receiving channel of the receiving channel cascaded-output of channel basic unit to second unit cascades input out, and so sequence is expanded extremely
Two input of m-th simulation, two output channel basic unit；
(4) Gauss white noise is superimposed in the two-way output of two input of m-th simulation, two output channel basic unit, total N grade
Sound source；
(5) digital signal after 2N grades of simulations is connected to digital analog converter, generates 2N path channels simulation output.
The beneficial effects of the present invention are:
Method of the invention combines the advantages of distributed signal processing, while avoiding logic channel and increasing bring meter
Increasing for capacity and transmitted data amount is calculated, the bottleneck of signal polymerization and transmission throughput in extensive mimo channel simulation is solved,
And it is easy to extend.Specifically:
1) two basic two output module units of input can realize the two-dimensional expansion on receiving channel or sendaisle direction,
It is easily achieved the simulation of extensive mimo channel.
2) standard I-O interface, identical computing architecture and capacity, resource consumption are fixed.
3) signal shunt and combiner use Digital Realization, ensure that each subchannel consistency.Multiple signals branch
It is real using the external sync module based on flow control due to the time delay introduced in data transmission and Collaborative Control when with merging
Existing alignment of data.
4) the interface throughput of each basic module depends on the throughput of two combining channels, will not be with analog channel
Several increases and increase.
Detailed description of the invention
Fig. 1 is the basic unit of the invention based on two inputs, two output channel simulation；
In figure, IN1/IN2: the base-band input signal after 1/2 analog-to-digital conversion of channel；
IN1’/IN2': the cascade input signal of 1/2 baseband transmission antenna of channel；
X1/X2: the base band in channel 1/2 waits for analog signal；
H1,1/H2,1/H1,2/H2,2: subchannel multipath fading simulator；
S1/S2: the cascade input signal of 1/2 Baseband Receiver antenna of channel；
N1/N2: the output of 1/2 white Gaussian noise signal of channel；
OUT1/OUT2: the baseband analog output signal before 1/2 digital-to-analogue conversion of channel；
OUT1’/OUT2': the cascaded-output signal of 1/2 Baseband Receiver antenna of channel；
Fig. 2 is the MIMO 4x4 channel simulation extended method of the invention based on basic unit.
Specific embodiment
Below with reference to specific attached drawing, the present invention will be further explained.
As shown in Figure 1, a kind of device of the extensive mimo channel simulation of high bandwidth of the invention, including several simulations two
Two output channel basic unit of input, single two input of simulation, two output channel basic unit includes the first analog-digital converter 1, the
Two analog-digital converters 3, the first transmission channel cascade input 2, the second transmission channel cascade input 4, the cascade of the first receiving channel is defeated
Enter 5, the second receiving channel cascades input 6, Gaussian white noise generator 7, external definition and synchronization module 8；First modulus
The output end of converter 1 and the first transmission channel cascade input 2 connects the first multiplexer 9, the first multiplexer 9 it is defeated
Outlet connects the first demultplexer 10, and the first demultplexer 10 is connected separately with the first subchannel fading simulator H1,1,
Two subchannel fading simulator H2,1With the first transmission channel cascaded-output 11, the first subchannel fading simulator H1,1With the second son
Channel fading simulator H2,1Output end connect first adder 12 and second adder 13, the output of first adder 12 respectively
Third adder 14 is terminated, the output of second adder 12 terminates the 4th adder 15；Second analog-digital converter 3 and second
The output end of transmission channel cascade input 4 connects the second multiplexer 16, the output end connection the of the second multiplexer 16
Two demultplexers 17, the second demultplexer 17 are connected separately with third subchannel fading simulator H1,2, the 4th subchannel declines
Fall simulator H2,2With the second transmission channel cascaded-output 18, third subchannel fading simulator H1,2With the 4th subchannel decline mould
Quasi- device H2,2Output end connect first adder 12 and second adder 13 respectively；First receiving channel cascade input, 5 connection third
The output end of adder 14, third adder 14 connects fifth adder 19, and fifth adder 19 connects third demultplexer 20,
Third demultplexer 20 connects the first digital analog converter 21 and the first receiving channel cascaded-output 22 respectively；Second receiving channel grade
Connection input 6 connects the 4th adder 15, and the 4th adder 15 connects the 6th adder 23, and the 6th adder 23 connects the 4th demultplexer
24, the 4th demultplexer 24 connects the second digital analog converter 25 and the second receiving channel cascaded-output 26 respectively；White Gaussian noise
Generator 7 connects fifth adder 19 and the 6th adder 23 respectively；First transmission channel cascaded-output 11 and the second transmission channel
Cascaded-output 18 connects the first transmission channel cascade input and the of next two input of simulation, two output channel basic units respectively
The cascade input of two transmission channels；First receiving channel cascaded-output 22 and the second receiving channel cascaded-output 26 connect next respectively
The the first receiving channel cascade input 5 and the second receiving channel cascade input 6 of two input of simulation, two output channel basic unit.
The external definition of several two input of simulation, two output channel basic units and synchronization module 8 are all connected with system clock
With timing module 27.
By the first analog-digital converter and the second analog-digital converter (ADC1/2), the base band of channel 1 and 2 is acquired
Input complex signal IN1And IN2, obtain needing transmitting signal data to be simulated.
Analog-digital converter inputs IN1/IN2Input signal IN is cascaded with transmission channel1’/IN2' pass through the first multiplexer
It exports after being selected with the second multiplexer as data flow X1And X2.The input signal of multiplexer is selected as analog-digital converter
Input.
The input X of first multiplexer and the second multiplexer1And X2It is identical that three tunnels are copied by demultplexer
Data flow X1And X2.The digital multipath fading simulator that wherein identical two paths of data stream respectively enters corresponding subchannel carries out
Channel multi-path decline simulation, output signal flow H1,1X1, H2,1X1, H1,2X2And H2,2X2。X1And X2Third circuit-switched data stream pass through
HSSI High-Speed Serial Interface or optical fiber interface are transmitted to next stage transmission channel, as transmission channel cascaded-output 1 and 2.
By external definition and synchronization module, H is realized1,1X1And H1,2X2Data flow alignment, is merged into using first adder
First via output signal, likewise, alignment H2,1X1And H2,2X2Data flow simultaneously merges into the second tunnel output letter using second adder
Number.First via output signal and the second tunnel output signal are received by third adder and the 4th adder with first respectively again leads to
Road cascade input is added to obtain Z with the cascade input of the second receiving channel1And Z2, as a result:
Z1=H1,1X1+H1,2X2+S1
Z2=H2,1X1+H2,2X2+S2
Last Z1And Z2Data flow passes through Gaussian white noise generator Additive White Noise N1And N2, generate output signal Y1With
Y2., expression formula are as follows:
Y1=H1,1X1+H1,2X2+S1+N1
Y2=H2,1X1+H2,2X2+S2+N2
Signal Y after output simulation1And Y2Two-way output is generated by third demultplexer and the 4th demultplexer,
In all the way output be transmitted to the first digital analog converter and the second digital analog converter, the digital signal after simulation is converted into base band mould
Quasi- signal, another output data flow are transmitted to next stage receiving channel by HSSI High-Speed Serial Interface or optical fiber interface, as the
One receiving channel cascaded-output and the second receiving channel cascaded-output.
For two input of simulation, two output channel basic unit, A/D and D/A converter interface is used for transmission multichannel
Physical signal, cascade input/output signal interface are used for transmission cascade output letter intermediate after analog input signal or simulation
Number, high-speed serial signals can be used or optical fiber realizes connection.
By cascading transmission channel cascaded-output and the input of N number of two input of simulation, two output channel basic unit, extension
It is exported for 2N analog channel, the receiving channel grade of two input of M simulation of cascade, two output channel basic unit can also be passed through
Connection output and input are extended to 2M analog channel input.To realize the extensive mimo channel mould of 2Mx2N sub-channels
It is quasi-.
Below in conjunction with attached drawing 2, cascade extension, four input of simulation, four output are carried out to M=2 in the solution of the present invention, N=2
The method of channel is described in more details, the specific steps are as follows:
It 1) is each unit configuration such as in Fig. 2 with four identical two input of simulation, two output channel basic unit M1-M4
Corresponding subchannel decline analog parameter H1,1, H2,1…H4,4。
2) by each two analog-digital converters in M1 and M4, four base band with analog channel is acquired and input complex signal
IN1-IN4, obtain needing transmitting signal data to be simulated.
3) input signal of the multiplexer in M1 and M4 is selected as analog-digital converter input.
4) input of every road is copied into the identical data flow IN1-IN4 in three tunnels by the demultplexer in M1 and M4, wherein two
Circuit-switched data stream respectively enters corresponding subchannel simulator and is simulated, and third circuit-switched data stream is connect by HSSI High-Speed Serial Interface or optical fiber
The transmission channel cascade input of M2 and M3 basic unit is transported in oral instructions.
5) input signal of the multiplexer in M2 and M3 is selected as cascade input, and passes through demultplexer duplication three
Road.
6) it by external definition and synchronization module, realizes in M1 and M2 with X1And X2It is simulated for the subchannel of input, alignment
Data flow simultaneously merges, and realizes in M3 and M4 with X3And X4It is simulated for the subchannel of input, align data stream simultaneously merges.
7) by external definition and synchronization module, using the automatic time delay alignment mechanism based on flow control, by M1 and M2
Signal after middle merging cascades input by the receiving channel of receiving channel cascaded-output to M3 and M4.
8) it by the adder and synchronous logic in M3 and M4, realizes with X1And X2For data after the subchannel simulation of input
It flows and with X3And X4For the merging of data flow after the subchannel simulation of input.
9) last four road output stream passes through the Gaussian white noise generator Additive White Noise N in M3 and M41-N4, generate
Output signal Y1And Y2., expression formula are as follows:
Y1=H1,1X1+H1,2X2+H1,3X3+H1,4X4+N1
Y2=H2,1X1+H2,2X2+H2,3X3+H2,4X4+N2
Y3=H3,1X1+H3,2X2+H3,3X3+H3,4X4+N3
Y4=H4,1X1+H4,2X2+H4,3X3+H4,4X4+N4
10) signal Y after output simulation1-Y4By demultplexer selection output to digital analog converter, by the number after simulation
Word signal is converted to signal OUT1-OUT4 after baseband analog.
11) mimo channel of 2M input 2N output is simulated, connects two input of N grades of simulations, two output channel basic unit
Transmission channel cascaded-output and transmission channel cascade input, cascade two input two of M grade simulations and export channel basic units and connect
Channel cascaded-output and receiving channel cascade input are received, the extensive mimo channel simulation of 2Mx2N sub-channels may be implemented.
In view of factors such as physical device performance, capacity, the basic unit of this extended method is exported using two inputs two,
But not limited to this.With equipment performance, speed, the raising of capacity can be using any 2Mx2N channel simulation module as basic
Unit is realized, to reduce the demand in extensive channel simulation to basic unit quantity.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of device of the extensive mimo channel simulation of high bandwidth, it is characterised in that: defeated including several two inputs two of simulation
Channel basic unit out, single two input of simulation, two output channel basic unit includes the first analog-digital converter, and the second modulus turns
Parallel operation, the cascade input of the first transmission channel, the cascade input of the second transmission channel, the cascade input of the first receiving channel, second receives
Channel cascade input, Gaussian white noise generator, external definition and synchronization module；First analog-digital converter and the first transmitting
The output end of channel cascade input connects the first multiplexer, and the output end of the first multiplexer connects the distribution of the first multichannel
Device, the first demultplexer are connected separately with the first subchannel fading simulator, the second subchannel fading simulator and the first hair
Penetrate channel cascaded-output, the output end of the first subchannel fading simulator and the second subchannel fading simulator connect respectively first plus
Musical instruments used in a Buddhist or Taoist mass and second adder, the output of first adder terminate third adder, and the output of second adder terminates the 4th addition
Device；Second analog-digital converter and the output end of the second transmission channel cascade input connect the second multiplexer, more than second
The output end of path multiplexer connects the second demultplexer, and the second demultplexer is connected separately with the decline simulation of third subchannel
Device, the 4th subchannel fading simulator and the second transmission channel cascaded-output, third subchannel fading simulator and the 4th son letter
The output end of road fading simulator connects first adder and second adder respectively；First receiving channel cascade input connection third
Adder, the output end of third adder connect fifth adder, and fifth adder connects third demultplexer, third multichannel point
Orchestration connects the first digital analog converter and the first receiving channel cascaded-output respectively；The cascade input of second receiving channel connects the 4th addition
Device, the 4th adder connect the 6th adder, and the 6th adder connects the 4th demultplexer, and the 4th demultplexer connects second respectively
Digital analog converter and the second receiving channel cascaded-output；Gaussian white noise generator connects fifth adder and the 6th addition respectively
Device；First transmission channel cascaded-output and the second transmission channel cascaded-output connect next two input of simulation, two output channel respectively
The the first transmission channel cascade input and the cascade input of the second transmission channel of basic unit；First receiving channel cascaded-output and
Two receiving channel cascaded-outputs connect the first receiving channel cascade of next two input of simulation, two output channel basic unit respectively
Input and the cascade input of the second receiving channel；
Several simulate the external definition of two inputs, two output channel basic units and synchronization module is all connected with system clock and determines
When module；
By the first analog-digital converter and the second analog-digital converter (ADC1/2), the base band input of channel 1 and 2 is acquired
Complex signal IN1And IN2, obtain needing transmitting signal data to be simulated；
Analog-digital converter inputs IN1/IN2Input signal IN is cascaded with transmission channel1’/IN2' pass through the first multiplexer and the
Output is data flow X after two multiplexers select1And X2；The input signal of multiplexer is selected as analog-digital converter input；
The input X of first multiplexer and the second multiplexer1And X2The identical number in three tunnels is copied by demultplexer
According to stream X1And X2；The digital multipath fading simulator that wherein identical two paths of data stream respectively enters corresponding subchannel carries out channel
Multipath fading simulation, output signal flow H1,1X1, H2,1X1, H1,2X2And H2,2X2；X1And X2Third circuit-switched data stream pass through optical fiber
Interface is transmitted to next stage transmission channel, as transmission channel cascaded-output 1 and 2；
By external definition and synchronization module, H is realized1,1X1And H1,2X2Data flow alignment, merges into first using first adder
Road output signal, likewise, alignment H2,1X1And H2,2X2Data flow simultaneously merges into the second tunnel output signal using second adder；
First via output signal and the second tunnel output signal pass through third adder and the 4th adder and the first receiving channel respectively again
Cascade input S1Input S is cascaded with the second receiving channel2Addition obtains Z1And Z2, as a result:
Z1=H1,1X1+H1,2X2+S1
Z2=H2,1X1+H2,2X2+S2
Last Z1And Z2Data flow passes through Gaussian white noise generator Additive White Noise N1And N2, generate output signal Y1And Y2,
Expression formula are as follows:
Y1=H1,1X1+H1,2X2+S1+N1
Y2=H2,1X1+H2,2X2+S2+N2
Signal Y after output simulation1And Y2Two-way output is generated by third demultplexer and the 4th demultplexer, wherein one
Road output is transmitted to the first digital analog converter and the second digital analog converter, and the digital signal after simulation is converted to baseband analog letter
Number, another output data flow is transmitted to next stage receiving channel by optical fiber interface, as the first receiving channel cascaded-output
With the second receiving channel cascaded-output；
For two input of simulation, two output channel basic unit, A/D and D/A converter interface is used for transmission the physics of multichannel
Signal, cascade input/output signal interface are used for transmission the cascade intermediate output signal after analog input signal or simulation, adopt
It is realized and is connected with optical fiber；
By cascading transmission channel cascaded-output and the input of N number of two input of simulation, two output channel basic unit, it is extended to 2N
A analog channel output can also be cascaded defeated by the receiving channel of two input of M simulation of cascade, two output channel basic unit
It out and inputs, is extended to 2M analog channel input, to realize the extensive mimo channel simulation of 2Mx2N sub-channels；Its
In, four input of simulation, four output channel is realized by following steps:
1) with four identical two input of simulation, two output channel basic unit M1-M4, subchannel decline is configured for each unit
Analog parameter H1,1, H2,1…H4,4；
2) by each two analog-digital converters in M1 and M4, four base band with analog channel is acquired and input complex signal IN1-
IN4, obtain needing transmitting signal data to be simulated；
3) input signal of the multiplexer in M1 and M4 is selected as analog-digital converter input；
4) input of every road is copied into the identical data flow IN1-IN4 in three tunnels by the demultplexer in M1 and M4, wherein two numbers
It respectively enters corresponding subchannel simulator according to stream to be simulated, third circuit-switched data stream is transmitted to M2 by optical fiber interface and M3 is basic
The transmission channel of unit cascades input；
5) input signal of the multiplexer in M2 and M3 is selected as cascade input, and replicates three tunnels by demultplexer；
6) it by external definition and synchronization module, realizes in M1 and M2 with X1And X2It is simulated for the subchannel of input, align data
It flows and merges, realize in M3 and M4 with X3And X4It is simulated for the subchannel of input, align data stream simultaneously merges；
7) it will be closed in M1 and M2 by external definition and synchronization module using the automatic time delay alignment mechanism based on flow control
Signal after and cascades input by the receiving channel of receiving channel cascaded-output to M3 and M4；
8) it by the adder and synchronous logic in M3 and M4, realizes with X1And X2For input subchannel simulation after data flow and
With X3And X4For the merging of data flow after the subchannel simulation of input；
9) last four road output stream passes through the Gaussian white noise generator Additive White Noise N in M3 and M41-N4, generate output
Signal Y1-Y4, expression formula are as follows:
Y1=H1,1X1+H1,2X2+H1,3X3+H1,4X4+N1
Y2=H2,1X1+H2,2X2+H2,3X3+H2,4X4+N2
Y3=H3,1X1+H3,2X2+H3,3X3+H3,4X4+N3
Y4=H4,1X1+H4,2X2+H4,3X3+H4,4X4+N4
10) signal Y after output simulation1-Y4By demultplexer selection output to digital analog converter, the number after simulation is believed
Number be converted to signal OUT1-OUT4 after baseband analog；
11) mimo channel of 2M input 2N output is simulated, connects the hair of two input of N grades of simulations, two output channel basic unit
Channel cascaded-output and transmission channel cascade input are penetrated, the reception for cascading two input of M grades of simulations, two output channel basic unit is logical
Road cascaded-output and receiving channel cascade input, realize the extensive mimo channel simulation of 2Mx2N sub-channels.
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