CN105337677A - High-bandwidth large-scale MIMO channel simulation method and device - Google Patents

High-bandwidth large-scale MIMO channel simulation method and device Download PDF

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CN105337677A
CN105337677A CN201510791889.4A CN201510791889A CN105337677A CN 105337677 A CN105337677 A CN 105337677A CN 201510791889 A CN201510791889 A CN 201510791889A CN 105337677 A CN105337677 A CN 105337677A
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channel
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CN105337677B (en
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张念祖
杨广琦
翟建锋
洪伟
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Southeast University
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Abstract

The invention discloses a high-bandwidth large-scale MIMO channel simulation method and device. The device is composed of a plurality of two-input two-output channel simulation basic units. An input signal to be simulated can enter a channel fading simulator of the respective unit to carry out channel simulation and can be relayed to other units in a mode of cascade connection through a transmission channel so as to be simulated; and a simulated output signal can be converted to a simulated base band simulation signal through a digital-to-analog converter, and an intermediate result can be output in a mode of cascade connection through a reception channel so as to be combined by the next level of unit. In addition, the basic units provide synchronization for each path of data signal transmission through synchronization and timing modules so as to realize single-module and system-level data alignment. A method of combination of cascade connection of M*N two-input two-output channel simulation basic units can be adopted to construct large-scale MIMO channel simulation, an interconnection scheme is simple and flexible and is easy to realize, internal logics and interfaces are unified, and large-scale MIMO channel simulation is facilitated.

Description

The method and apparatus of the extensive mimo channel simulation of a kind of high bandwidth
Technical field
The present invention relates to radio communication and field tests, particularly relate to a kind of analogy method of extensive multi-input multi-ouput channel of high bandwidth; Be applied to wireless communication system field tests.
Background technology
Wireless channel is complicated and changeable signal physical channel, there is the unfavorable factor that multipath fading, flat decline, noise etc. affect communication performance, and these be all communication systems must emphasis consider problem, the simulation of channel is under ensureing same communication protocol and system system, the requisite testing process of smooth and easy communication between the system equipment that the terminal of different manufacturers exploitation and many producers provide.Utilize channel simulator can also control, change channel parameter, and then understand communication equipment or the performance of means of communication under different channels condition.MIMO radio channel simulator; the development cost of LTE-A mobile communication equipment can be saved; add flexibility during research and development; shorten the lead time simultaneously; reduce the overall development process of base station and terminal equipment and interconnect the testing time; reduce time of field testing, to improve and ensure different system, the interconnection and interflow of manufacturer terminal has very positive effect.
The simulation of characteristics of radio channels can be divided into numerical portion to simulate and simulation partial simulation.Digital baseband signal simulation is primarily of Digital Signal Processing composition, and it is the integrated application of igh-speed wire-rod production line technology and Computer Applied Technology.The simulation of radio frequency part realizes primarily of analog circuit, the Up/Down Conversion of settling signal and the effect of amplification.The Ditital multichannel footpath fading characteristic simulator that the critical component of channel simulator is is core with discrete type tapped delay line.Its realization consumes a large amount of Digital Logic resources.The signal bandwidth of simulation is wider, and digital signal acquiring speed is faster, and throughput is also higher.For the simulation of the multi-antenna channel of M the N number of reception antenna of transmitting antenna, the digital multipath fading device of needs doubly increases along with MxN, and along with the growth of reception antenna number, N is also multiplied by throughput when signal merges.Therefore, when the logical sub-channel number or dual-mode antenna number that need simulation increase, ability and the system throughput of signal transacting all face big challenge.
Mimo channel is simulated, usual employing power dividers etc. point need the signal of simulation, then down-conversion is passed through, digital simulation is carried out by the fading simulator of each subchannel after analog/digital conversion, output signal through digital-to-analog conversion, carries out signal merging by power combiner after up-conversion more again.But each branch road distribution of broadband analog signal is compared with merging and is difficult to ensure accuracy and consistency, thus causes the deviation that each branch road is simulated.In recent years, develop into gradually and in base band digital signal to be carried out along separate routes and to close the method on road.But along with signal bandwidth more and more wider (bandwidth is more than 100MHz), the input and output antenna of MIMO is more and more (receiving/send out 256, antenna), especially extensive MIMO (MassiveMulti-Input-Multi-Output, MassiveMIMO) application of technology in 5G communication, the merging of analog signal will be more and more higher with transmission throughput, and the timing demands on its each road is more and more higher.
Summary of the invention
The object of the present invention is to provide method and the device of the extensive mimo channel simulation of a kind of high bandwidth, this based on distributed pipeline processing scheme, complexity is low, and it is convenient to realize, framework is easy to expansion, well can adapt to the application of the extensive antenna of following high bandwidth.
For achieving the above object, the technical solution used in the present invention is:
The device of the extensive mimo channel simulation of a kind of high bandwidth, comprise several simulation two input two delivery channel elementary cells, single simulation two inputs two delivery channel elementary cells and comprises the first analog to digital converter, second analog to digital converter, the first transmission channel cascade input, the second transmission channel cascade input, first receive path cascade input, second receive path cascade input, Gaussian white noise generator, external definition and synchronization module; The output that described first analog to digital converter inputs with the first transmission channel cascade is connected the first multiplexer, the output of the first multiplexer connects the first demultplexer, first demultplexer is connected to the first subchannel fading simulator, the second subchannel fading simulator and the first transmission channel cascaded-output, the output of the first subchannel fading simulator and the second subchannel fading simulator connects first adder and second adder respectively, output termination the 3rd adder of first adder, output termination the 4th adder of second adder; The output that described second analog to digital converter inputs with the second transmission channel cascade is connected the second multiplexer, the output of the second multiplexer connects the second demultplexer, second demultplexer is connected to the 3rd subchannel fading simulator, the 4th subchannel fading simulator and the second transmission channel cascaded-output, and the output of the 3rd subchannel fading simulator and the 4th subchannel fading simulator connects first adder and second adder respectively; First receive path cascade input connection the 3rd adder, the output of the 3rd adder connects slender acanthopanax musical instruments used in a Buddhist or Taoist mass, and slender acanthopanax musical instruments used in a Buddhist or Taoist mass connects the 3rd demultplexer, and the 3rd demultplexer connects the first digital to analog converter and the first receive path cascaded-output respectively; Second receive path cascade input connects the 4th adder, and the 4th adder connects the 6th adder, and the 6th adder connects the 4th demultplexer, and the 4th demultplexer connects the second digital to analog converter and the second receive path cascaded-output respectively; Gaussian white noise generator connects slender acanthopanax musical instruments used in a Buddhist or Taoist mass and the 6th adder respectively; First transmission channel cascaded-output and the second transmission channel cascaded-output connect the first transmission channel cascade input and the second transmission channel cascade input of next simulation two input two delivery channel elementary cells respectively; First receive path cascaded-output and the second receive path cascaded-output connect the first receive path cascade input and the second receive path cascade input of next simulation two input two delivery channel elementary cells respectively.
Several simulation two input external definitions of two delivery channel elementary cells and the equal connected system clock of synchronization module and time block.
A method for the extensive mimo channel simulation of high bandwidth, comprises the steps:
A) simulating two input two delivery channel elementary cells adopts two-way input and two-way to export;
B) input signal is after broadband signal down-conversion, utilizes the base band data that high-speed AD converter gathers, or by the transmitting antenna cascade input traffic that HSSI High-Speed Serial Interface is transmitted, utilizes the multiplexer of Digital Logic to select one of them;
First via base-band data stream is copied three parts by the demultplexer c) passed through, first part of copy transfers to the first subchannel fading simulator and simulates, second part of copy transfers to the second subchannel fading simulator and simulates, and the 3rd part of copy transfers to next module by HSSI High-Speed Serial Interface and simulate;
D) utilize the demultplexer of Digital Logic by the second roadbed band data flow replication three parts, first part of copy transfers to the 3rd subchannel fading simulator and simulates, second part of copy transmission the 4th subchannel fading simulator is simulated, and the 3rd part of copy transfers to next module by HSSI High-Speed Serial Interface and simulate;
E) external definition and synchronization module is utilized, synchronous first subchannel fading simulator exports, the 3rd subchannel fading simulator exports and the first receive path cascade input data, and addition obtains first passage analog output signal, same, synchronous second subchannel fading simulator exports, the 4th subchannel fading simulator exports and the second receive path cascade input data, and addition obtains second channel analog output signal;
F) the independent incoherent white Gaussian noise of analog output signal superposition of two passages;
G) output signal of last each passage is by digital to analog converter Analog Baseband data, transfers to radio-frequency module and carries out up-conversion, or by next stage receive path that HSSI High-Speed Serial Interface transfers to.
For 2M road input signal, the mimo channel simulation of 2N road output signal, use MxN to simulate two input two delivery channel elementary cells and expand, extended mode is as follows:
(1) 2M road input signal is baseband digital signal respectively by analog to digital converter collection in M simulation two input two delivery channel elementary cells;
(2) the transmission channel cascaded-output of 2M road input signal is connected to 2M transmission channel cascade input of second level M simulation two input two delivery channel elementary cells respectively, the transmission channel cascaded-output of second level M simulation two input two delivery channel elementary cells is connected to the third level again, and so order is expanded to N level;
(3) M is had to simulate two input two delivery channel elementary cells in every one-level, the receive path cascaded-output connecting first simulation two input, two delivery channel elementary cells input to the receive path cascade of second unit, and so order is expanded and simulated two to M and input two delivery channel elementary cells;
(4) export at the two-way of M simulation two input two delivery channel elementary cells, altogether N level superposes white Gaussian noise source;
(5) digital signal after 2N level being simulated is connected to digital to analog converter, produces 2N path channels modulating output.
The invention has the beneficial effects as follows:
The methods combining of the present invention advantage of distributed signal process, avoids rising of calculated capacity that logic channel increase brings and transmitted data amount simultaneously, solves the bottleneck of signal polymerization and transmission throughput in the simulation of extensive mimo channel, and be easy to expansion.Be specially:
1) two basic input two output module unit can realize the two-dimensional expansion on receive path or sendaisle direction, are easy to the simulation realizing extensive mimo channel.
2) standard I-O interface, identical computing architecture and capacity, resource consumption is fixed.
3) signal shunt and mixer adopt Digital Realization, ensure that each subchannel consistency.When multiple signals are along separate routes with merging, due to the time delay that transfer of data and Collaborative Control are introduced, the external sync module based on flow control is adopted to realize alignment of data.
4) the interface throughput of each basic module depends on the throughput of two combining channels, can not increase along with the increase of analog channel number.
Accompanying drawing explanation
Fig. 1 is the elementary cell based on two input two delivery channel simulations of the present invention;
In figure, IN 1/ IN 2: the base-band input signal after passage 1/2 analog-to-digital conversion;
IN 1'/IN 2': the cascade input signal of passage 1/2 baseband transmission antenna;
X 1/ X 2: the base band of passage 1/2 treats analog signal;
H 1,1/ H 2,1/ H 1,2/ H 2,2: subchannel multipath fading simulator;
S 1/ S 2: the cascade input signal of passage 1/2 Baseband Receiver antenna;
N 1/ N 2: passage 1/2 white Gaussian noise signal exports;
OUT 1/ OUT 2: the baseband analog output signal before passage 1/2 digital-to-analogue conversion;
OUT 1'/OUT 2': the cascaded-output signal of passage 1/2 Baseband Receiver antenna;
Fig. 2 is the MIMO4x4 channel simulation extended method based on elementary cell of the present invention.
Embodiment
Below in conjunction with concrete accompanying drawing, the present invention is further described.
As shown in Figure 1, the device of the extensive mimo channel simulation of a kind of high bandwidth of the present invention, comprise several simulation two input two delivery channel elementary cells, single simulation two inputs two delivery channel elementary cells and comprises the first analog to digital converter 1, second analog to digital converter 3, first transmission channel cascade input 2, second transmission channel cascade input 4, first receive path cascade input 5, second receive path cascade input 6, Gaussian white noise generator 7, external definition and synchronization module 8; Described first analog to digital converter 1 is connected the first multiplexer 9 with the output of the first transmission channel cascade input 2, the output of the first multiplexer 9 connects the first demultplexer 10, first demultplexer 10 and is connected to the first subchannel fading simulator H 1,1, the second subchannel fading simulator H 2,1with the first transmission channel cascaded-output 11, first subchannel fading simulator H 1,1with the second subchannel fading simulator H 2,1output connect first adder 12 and second adder 13 respectively, output termination the 3rd adder 14 of first adder 12, output termination the 4th adder 15 of second adder 12; Described second analog to digital converter 3 is connected the second multiplexer 16 with the output of the second transmission channel cascade input 4, the output of the second multiplexer 16 connects the second demultplexer 17, second demultplexer 17 and is connected to the 3rd subchannel fading simulator H 1,2, the 4th subchannel fading simulator H 2,2with the second transmission channel cascaded-output the 18, three subchannel fading simulator H 1,2with the 4th subchannel fading simulator H 2,2output connect first adder 12 and second adder 13 respectively; First receive path cascade input 5 connects the 3rd adder 14, the output of the 3rd adder 14 connects slender acanthopanax musical instruments used in a Buddhist or Taoist mass 19, slender acanthopanax musical instruments used in a Buddhist or Taoist mass 19 connects the 3rd demultplexer 20, and the 3rd demultplexer 20 connects the first digital to analog converter 21 and the first receive path cascaded-output 22 respectively; Second receive path cascade input 6 connects the 4th adder the 15, four adder 15 and connects the 6th adder the 23, six adder 23 and connect the 4th demultplexer the 24, four demultplexer 24 and connect the second digital to analog converter 25 and the second receive path cascaded-output 26 respectively; Gaussian white noise generator 7 connects slender acanthopanax musical instruments used in a Buddhist or Taoist mass 19 and the 6th adder 23 respectively; First transmission channel cascaded-output 11 and the second transmission channel cascaded-output 18 connect the first transmission channel cascade input and the second transmission channel cascade input of next simulation two input two delivery channel elementary cells respectively; First receive path cascaded-output 22 and the second receive path cascaded-output 26 connect the first receive path cascade input 5 and the second receive path cascade input 6 of next simulation two input two delivery channel elementary cells respectively.
The external definition of several simulation two input two delivery channel elementary cells and synchronization module 8 all connected system clock and time blocks 27.
By the first analog-digital converter and the second analog-digital converter (ADC1/2), gather the base band input complex signal IN of channel 1 and 2 1and IN 2, obtain the data that transmit needing simulation.
Analog to digital converter input IN 1/ IN 2with transmission channel cascade input signal IN 1'/IN 2' select rear output as data flow X by the first multiplexer and the second multiplexer 1and X 2.The input signal of multiplexer is chosen as analog to digital converter input.
The input X of the first multiplexer and the second multiplexer 1and X 2the identical data flow X in three tunnels is copied into by demultplexer 1and X 2.The digital multipath fading simulator that wherein identical two paths of data stream enters corresponding subchannel respectively carries out channel multi-path decline simulation, and output signal flow is H 1,1x 1, H 2,1x 1, H 1,2x 2and H 2,2x 2.X 1and X 2the 3rd circuit-switched data flow through HSSI High-Speed Serial Interface or optical fiber interface transfers to next stage transmission channel, as transmission channel cascaded-output 1 and 2.
By external definition and synchronization module, realize H 1,1x 1and H 1,2x 2data flow is alignd, and uses first adder to merge into first via output signal, same, alignment H 2,1x 1and H 2,2x 2data flow also uses second adder to merge into the second tunnel output signal.First via output signal and the second tunnel output signal and to input with the first receive path cascade respectively by the 3rd adder and the 4th adder and the second receive path cascade input is added and obtains Z again 1and Z 2, its result is:
Z 1=H 1,1X 1+H 1,2X 2+S 1
Z 2=H 2,1X 1+H 2,2X 2+S 2
Last Z 1and Z 2data flow is by Gaussian white noise generator Additive White Noise N 1and N 2, produce output signal Y 1and Y 2., its expression formula is:
Y 1=H 1,1X 1+H 1,2X 2+S 1+N 1
Y 2=H 2,1X 1+H 2,2X 2+S 2+N 2
Export the rear signal Y of simulation 1and Y 2produce two-way by the 3rd demultplexer and the 4th demultplexer to export, wherein a road exports and transfers to the first digital to analog converter and the second digital to analog converter, digital signal after simulation is converted to base-band analog signal, another road output stream transfers to next stage receive path by HSSI High-Speed Serial Interface or optical fiber interface, as the first receive path cascaded-output and the second receive path cascaded-output.
Two delivery channel elementary cells are inputted for simulation two, A/D and D/A converter interface is for transmitting multichannel physical signalling, cascade input/output signal interface, for transmitting the intermediate output signal after analog input signal or simulation of cascade, can adopt high-speed serial signals or optical fiber to realize connecting.
Transmission channel cascaded-output and the input of two delivery channel elementary cells is inputted by the N number of simulation two of cascade, expand to 2N analog channel to export, also by the receive path cascaded-output of cascade M simulation two input two delivery channel elementary cells and input, 2M analog channel input can be expanded to.Thus realize the extensive mimo channel simulation of 2Mx2N sub-channels.
Below in conjunction with accompanying drawing 2, carry out cascade expansion to M=2, N=2 in the solution of the present invention, the method for simulation four input four delivery channels is described in more details, and concrete steps are as follows:
1) simulation two that utilization four is identical inputs two delivery channel elementary cell M1-M4, for each cell location is as subchannel corresponding in Fig. 2 decline analog parameter H 1,1, H 2,1h 4,4.
2) by two analog-digital converters each in M1 and M4, the base band input complex signal IN of four band analog channels is gathered 1-IN 4, obtain the data that transmit needing simulation.
3) input signal of the multiplexer in M1 and M4 is chosen as analog to 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 with M4, wherein two paths of data stream enters corresponding subchannel simulator respectively and simulates, and the 3rd circuit-switched data flows through the transmission channel cascade input that HSSI High-Speed Serial Interface or optical fiber interface transfer to M2 and M3 elementary cell.
5) input signal of the multiplexer in M2 and M3 is chosen as cascade input, and copies three tunnels by demultplexer.
6) by external definition and synchronization module, realize with X in M1 and M2 1and X 2for the subchannel simulation of input, align data stream also merges, and realizes with X in M3 and M4 3and X 4for the subchannel simulation of input, align data stream also merges.
7) by external definition and synchronization module, use the automatic time delay alignment mechanism based on flow control, the signal after merging in M1 and M2 is inputted by the receive path cascade of receive path cascaded-output to M3 and M4.
8) by the adder in M3 and M4 and synchronous logic, realize with X 1and X 2for data flow after the subchannel simulation of input with X 3and X 4for the merging of data flow after the subchannel simulation of input.
9) last four road output streams are by the Gaussian white noise generator Additive White Noise N in M3 and M4 1-N 4, produce output signal Y 1and Y 2., its expression formula is:
Y 1=H 1,1X 1+H 1,2X 2+H 1,3X 3+H 1,4X 4+N 1
Y 2=H 2,1X 1+H 2,2X 2+H 2,3X 3+H 2,4X 4+N 2
Y 3=H 3,1X 1+H 3,2X 2+H 3,3X 3+H 3,4X 4+N 3
Y 4=H 4,1X 1+H 4,2X 2+H 4,3X 3+H 4,4X 4+N 4
10) the rear signal Y of simulation is exported 1-Y 4select to export digital to analog converter to by demultplexer, the digital signal after simulation is converted to signal OUT1-OUT4 after baseband analog.
11) 2M is inputted to the mimo channel simulation of 2N output, connect transmission channel cascaded-output and the transmission channel cascade input of N level simulation two input two delivery channel elementary cells, the receive path cascaded-output of cascade M level simulation two input two delivery channel elementary cells and receive path cascade input, can realize the extensive mimo channel simulation of 2Mx2N sub-channels.
Consider the factors such as physical device performance, capacity, the elementary cell of this extended method adopts two inputs two to export, but is not limited to this.Along with equipment performance, speed, the raising of capacity, can be realized any 2Mx2N channel simulation module as elementary cell, thus reduce in extensive channel simulation to the demand of elementary cell quantity.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (4)

1. the device of the extensive mimo channel simulation of high bandwidth, it is characterized in that: comprise several simulation two input two delivery channel elementary cells, single simulation two inputs two delivery channel elementary cells and comprises the first analog to digital converter, second analog to digital converter, the first transmission channel cascade input, the second transmission channel cascade input, first receive path cascade input, second receive path cascade input, Gaussian white noise generator, external definition and synchronization module; The output that described first analog to digital converter inputs with the first transmission channel cascade is connected the first multiplexer, the output of the first multiplexer connects the first demultplexer, first demultplexer is connected to the first subchannel fading simulator, the second subchannel fading simulator and the first transmission channel cascaded-output, the output of the first subchannel fading simulator and the second subchannel fading simulator connects first adder and second adder respectively, output termination the 3rd adder of first adder, output termination the 4th adder of second adder; The output that described second analog to digital converter inputs with the second transmission channel cascade is connected the second multiplexer, the output of the second multiplexer connects the second demultplexer, second demultplexer is connected to the 3rd subchannel fading simulator, the 4th subchannel fading simulator and the second transmission channel cascaded-output, and the output of the 3rd subchannel fading simulator and the 4th subchannel fading simulator connects first adder and second adder respectively; First receive path cascade input connection the 3rd adder, the output of the 3rd adder connects slender acanthopanax musical instruments used in a Buddhist or Taoist mass, and slender acanthopanax musical instruments used in a Buddhist or Taoist mass connects the 3rd demultplexer, and the 3rd demultplexer connects the first digital to analog converter and the first receive path cascaded-output respectively; Second receive path cascade input connects the 4th adder, and the 4th adder connects the 6th adder, and the 6th adder connects the 4th demultplexer, and the 4th demultplexer connects the second digital to analog converter and the second receive path cascaded-output respectively; Gaussian white noise generator connects slender acanthopanax musical instruments used in a Buddhist or Taoist mass and the 6th adder respectively; First transmission channel cascaded-output and the second transmission channel cascaded-output connect the first transmission channel cascade input and the second transmission channel cascade input of next simulation two input two delivery channel elementary cells respectively; First receive path cascaded-output and the second receive path cascaded-output connect the first receive path cascade input and the second receive path cascade input of next simulation two input two delivery channel elementary cells respectively.
2. the device of the extensive mimo channel simulation of high bandwidth as claimed in claim 1, is characterized in that: the external definition of several simulation two input two delivery channel elementary cells and the equal connected system clock of synchronization module and time block.
3. a method for the extensive mimo channel simulation of high bandwidth, is characterized in that: comprise the steps:
A) simulating two input two delivery channel elementary cells adopts two-way input and two-way to export;
B) input signal is after broadband signal down-conversion, utilizes the base band data that high-speed AD converter gathers, or by the transmitting antenna cascade input traffic that HSSI High-Speed Serial Interface is transmitted, utilizes the multiplexer of Digital Logic to select one of them;
First via base-band data stream is copied three parts by the demultplexer c) passed through, first part of copy transfers to the first subchannel fading simulator and simulates, second part of copy transfers to the second subchannel fading simulator and simulates, and the 3rd part of copy transfers to next module by HSSI High-Speed Serial Interface and simulate;
D) utilize the demultplexer of Digital Logic by the second roadbed band data flow replication three parts, first part of copy transfers to the 3rd subchannel fading simulator and simulates, second part of copy transmission the 4th subchannel fading simulator is simulated, and the 3rd part of copy transfers to next module by HSSI High-Speed Serial Interface and simulate;
E) external definition and synchronization module is utilized, synchronous first subchannel fading simulator exports, the 3rd subchannel fading simulator exports and the first receive path cascade input data, and addition obtains first passage analog output signal, same, synchronous second subchannel fading simulator exports, the 4th subchannel fading simulator exports and the second receive path cascade input data, and addition obtains second channel analog output signal;
F) the independent incoherent white Gaussian noise of analog output signal superposition of two passages;
G) output signal of last each passage is by digital to analog converter Analog Baseband data, transfers to radio-frequency module and carries out up-conversion, or by next stage receive path that HSSI High-Speed Serial Interface transfers to.
4. the method for the extensive mimo channel simulation of high bandwidth as claimed in claim 3, is characterized in that:
For 2M road input signal, the mimo channel simulation of 2N road output signal, use MxN to simulate two input two delivery channel elementary cells and expand, extended mode is as follows:
(1) 2M road input signal is baseband digital signal respectively by analog to digital converter collection in M simulation two input two delivery channel elementary cells;
(2) the transmission channel cascaded-output of 2M road input signal is connected to 2M transmission channel cascade input of second level M simulation two input two delivery channel elementary cells respectively, the transmission channel cascaded-output of second level M simulation two input two delivery channel elementary cells is connected to the third level again, and so order is expanded to N level;
(3) M is had to simulate two input two delivery channel elementary cells in every one-level, the receive path cascaded-output connecting first simulation two input, two delivery channel elementary cells input to the receive path cascade of second unit, and so order is expanded and simulated two to M and input two delivery channel elementary cells;
(4) export at the two-way of M simulation two input two delivery channel elementary cells, altogether N level superposes white Gaussian noise source;
(5) digital signal after 2N level being simulated is connected to digital to analog converter, produces 2N path channels modulating output.
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CN105607520A (en) * 2016-02-19 2016-05-25 北京空间飞行器总体设计部 Remote measurement acquisition control device for general extensible spacecraft
CN105607520B (en) * 2016-02-19 2018-05-01 北京空间飞行器总体设计部 A kind of spacecraft telemetry-acquisition control device of generic Extensible
CN108418611A (en) * 2018-03-08 2018-08-17 成都坤恒顺维科技股份有限公司 A kind of extensive Multiinputoutput wireless channel simulation instrument
CN109802738B (en) * 2019-02-01 2021-08-31 中电科思仪科技股份有限公司 Distributed MIMO channel simulation synchronization device, system and method
CN110971314A (en) * 2019-12-06 2020-04-07 武汉大学 Wireless channel monitoring and simulating device with multipath input and multipath output
CN110971314B (en) * 2019-12-06 2021-03-30 武汉大学 Wireless channel monitoring and simulating device with multipath input and multipath output

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