CN109302242A - A kind of two-way implementation method of mimo channel simulator TDD - Google Patents
A kind of two-way implementation method of mimo channel simulator TDD Download PDFInfo
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- CN109302242A CN109302242A CN201711436600.2A CN201711436600A CN109302242A CN 109302242 A CN109302242 A CN 109302242A CN 201711436600 A CN201711436600 A CN 201711436600A CN 109302242 A CN109302242 A CN 109302242A
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- switching
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- switch
- channel simulator
- input terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of mimo channel simulators, including channel simulator radio frequency unit and channel simulator Base Band Unit, channel simulator radio frequency unit includes switching switching group, RX module and TX module, channel simulator Base Band Unit includes ADC module, FPGA module and DAC module, also discloses a kind of two-way implementation method of mimo channel simulator TDD.The present invention realizes the real-time generation of multichannel base band data using standalone module control technology；Guarantee that different 16 output signals of TX module are mutually orthogonal by quadrature base band synthetic technology, to efficiently solve different channel signal interference problems；Using protection band interpolation technique effective solution intersymbol interference problem.The present invention communicates multi-port antenna for 5G and provides verification platform, provides effective guarantee for the development of 5G technology.
Description
Technical field
The present invention relates to the communications field 5G more particularly to a kind of two-way implementation methods of mimo channel simulator TDD.
Background technique
As the research and development of 5G mobile communication technology and industrialization quickly propel, wireless communication technique obtained quick hair
Exhibition.Radio communication channel environment is complicated, and there is the spies that multipath fading, delay extension, Doppler's decline etc. influence communication quality
Property.The wireless communications environment to become increasingly complex brings difficulty to high-quality wireless communication system is designed and developed.It is ground in communication system
During system, need to fully consider unfavorable factor existing for wireless channel.
Conventional channel simulator is one-way only operation, i.e., can only be transmitted to terminal after channel is added from base station received signal,
Or base station is issued again from terminal received signals, in order to meet the requirement of base station and terminal two-way communication, two channel moulds can only be used
Quasi- device builds test environment simultaneously, carries out uplink and downlink test respectively, and two radiofrequency signals pass through circulator access base station or end again
The prevention at radio-frequency port at end.This scheme build test environment it is more complicated, cost is also higher.
Therefore, there are also to be developed for the prior art.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, it is logical it is an object of the invention to solve bidirectional transmit-receive in channel simulator
Road is multiplexed a set of Base Band Unit and interferes with each other the problem of implementation mapped with bidirectional transmit-receive channel to single radio frequency input/output interface.
In order to achieve the above object, this invention takes following technical schemes:
A kind of mimo channel simulator,
Including channel simulator radio frequency unit and channel simulator Base Band Unit, the channel simulator radio frequency unit includes
Switch switching group, RX module and TX module, the output end of the switching switching group is connect with the input terminal of the RX module, described
Switching switching group input terminal connect with the output end of the TX module, the channel simulator Base Band Unit include ADC module,
FPGA module and DAC module, the output end of the ADC module are connect with the input terminal of the FPGA module, the FPGA module
Output end connect with the input terminal of the DAC module, the input terminal of the ADC module connects the RX module output end, institute
The output end for stating DAC module connects the input terminal of the TX module.
Further, including multiple channel simulator radio frequency units.
The present invention also provides a kind of two-way implementation methods of mimo channel simulator TDD, include the following steps:
Step S1: being transmitted to switching switching group by input terminal for signal, and switching switching group carries out logical operation, signal via
RX module transfer to ADC module samples；
Step S2: signal is sent into FPGA module by ADC module sampling, and FPGA module is implemented to realize the mistake of channel fading
Journey；
Step S3: signal is transmitted to DAC module, realizes digital-to-analogue conversion；
Step S4: signal reaches switching switching group after TX module after being exported by DAC module, and switching switching group is patrolled
Operation is collected, signal is exported.
Further, the switching switching group includes the first switching switch, the second switching switch, third switching switch and the
Four switching switches, the first switching output switching terminal are connect with the second switching switch input terminal, and the third switching is opened
It closes output end to connect with the second switching switch input terminal, the 4th switching output switching terminal switches with described first respectively
Switch, third switching switch input terminal connection, the second switching output switching terminal are connect with the input terminal of the RX module, institute
The 4th switching switch input terminal is stated to connect with the output end of the TX module.
Further, judgement is downlink signal or uplink signal, if downlink signal, then opens first switching and opens
Close the access between the access and third switching switch and the 4th switch between the second switching switch；Believe if uplink
Number, then open access between third switching switch and the four or two switching switch and the 4th switching switch and the first switching
Access between switch.
Further, the switching switching group has delay in switching, is met inside FPGA module with this
Delay register clearing processing.
The present invention compared with prior art the utility model has the advantages that the present invention proposes the two-way realization that cooperates based on switching group
Scheme, the detection based on input signal power realize that rapidly multiple groups switch on-off, switching is received compared with default handoff threshold
Channel is sent out, since the working band of switch is wide, isolation is high, and very high dynamic range may be implemented in this scheme, if multistage
Switch cascade, can further increase isolation, to improve the dynamic range of channel simulator, and Base Band Unit is in order to keep away
Exempt from uplink and downlink interference, the register clearing inside FPGA module is handled in uplink and downlink switching, it can also be ensured that uplink and downlink letter
The result of road simulation does not have data contamination.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of mimo channel simulator provided in an embodiment of the present invention；
Fig. 2 is the flow diagram of the two-way implementation method of mimo channel simulator TDD provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or it may be simultaneously present centering elements.When an element is known as " being connected to " another element, it can
To be directly to another element or may be simultaneously present centering elements.
It is only relative concept each other it should also be noted that, the positional terms such as left and right, upper and lower in the embodiment of the present invention
It or is to refer to, and should not be regarded as restrictive with the normal operating condition of product.
As shown in Figure 1, be a kind of mimo channel simulator of the specific embodiment of the invention,
Including channel simulator radio frequency unit 1 and channel simulator Base Band Unit 2, the channel simulator radio frequency unit 1
Including switching switching group, RX module 15 and TX module 16, the output end of the switching switching group and the input of the RX module 15
The input terminal of end connection, the switching switching group is connect with the output end of the TX module 16, the channel simulator base band list
Member 2 includes ADC module 21, FPGA module 22 and DAC module 23, the output end of the ADC module 21 and the FPGA module 22
Input terminal connection, the output end of the FPGA module 22 connect with the input terminal of the DAC module 23, the ADC module 21
Input terminal connect 15 output end of RX module, the output end of the DAC module 23 connects the input terminal of the TX module 16.
Specifically, including multiple channel simulator radio frequency units 1.
As shown in Fig. 2, the present invention additionally uses following technical solution to achieve the goal:
A kind of two-way implementation method of mimo channel simulator TDD, specifically comprises the following steps:
Step S1: being transmitted to switching switching group by input terminal for signal, and switching switching group carries out logical operation, signal via
RX module transfer to ADC module samples；
Step S2: signal is sent into FPGA module by ADC module sampling, and FPGA module is implemented to realize the mistake of channel fading
Journey；
Step S3: signal is transmitted to DAC module, realizes digital-to-analogue conversion；
Step S4: signal reaches switching switching group after TX module after being exported by DAC module, and switching switching group is patrolled
Operation is collected, signal is exported.
Specifically, the switching switching group includes that the first switching switch 11, second switches switch 12, third switches switch 13
With the 4th switching switch 14, first switching 11 output end of switch is connect with the second switching 12 input terminal of switch, described
Third switches 13 output end of switch and connect with second switching, 12 switch input terminals, the 4th switching 14 output end of switch point
It is not connect with the first switching switch 11, third switching 13 input terminal of switch, second switching 12 output end of switch and institute
The input terminal connection of RX module 15 is stated, the 4th switching 14 input terminal of switch is connect with the output end of the TX module 16.
Specifically, judgement is downlink signal or uplink signal, if downlink signal, then the first switching switch is opened
11 and second switching switch 12 between access and the third switching switch 13 and the 4th switch between 14 access；If
Uplink signal then opens access and the 4th switching switch 14 between the third switching switch 13 and the second switching switch 12
And first switching switch 11 between access.
Specifically, the switching switching group has delay in switching, met inside FPGA module 22 with this
Delay register clearing processing.
When base station and terminal are SISO connection types, the path of downlink is used as signal by antenna for base station outlet first
Source is switched by the switching of channel simulator radio frequency unit 1, switches switch 12, RX module along the first switching switch 11, second
15 arrive channel simulator Base Band Unit 2, sample by ADC module 21 and are sent into FPGA module 22, under 22 real-time implementation of FPGA module
The process of row channel fading gives channel simulator radio frequency unit 1 using DAC module 23, switches along TX module the 16, the 4th
Switch 14, third switch 13 incoming terminal antenna of switch.The path of uplink is used as signal source by terminal antenna outlet first,
It is switched by the switching of channel simulator radio frequency unit 1, switches switch 12, RX module 15 along third switching switch 13, second
Path samples by ADC module 21 to channel simulator Base Band Unit 2 and is sent into FPGA module 22,22 real-time implementation of FPGA module
The process of up channel decline gives channel simulator radio frequency unit 1 using DAC module 23, reaches antenna for base station.Due to being
Tdd mode, uplink and downlink are timesharing, can be with shared path.
After FPGA module 22 receives the sampled value of ADC module 21, since uplink and downlink shares logic, channel simulation is TDL/
CDL be delayed line model, 22 internal logic of FPGA module can uplink and downlink switch when residual data, the channel mould of uplink and downlink can be caused
Quasi- interference, in order to avoid this interference, it would be desirable to the delay register inside FPGA module be reset in uplink and downlink switching
Processing, the sampled data of uplink and downlink is cached by switching in short-term, after internal register is all reset, is re-fed into channel
Analogue unit, buffer memory capacity are determined by adjacent multi-path maximum delay and the processing clock of FPGA module.
The present invention realizes the real-time generation of multichannel base band data using standalone module control technology；It is closed by quadrature base band
Guarantee that different 16 output signals of TX module are mutually orthogonal at technology, to efficiently solve different channel signal interference problems；It adopts
With protection band interpolation technique effective solution intersymbol interference problem.The present invention provides verifying for 5G communication multi-port antenna and puts down
Platform provides effective guarantee for the development of 5G technology.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. a kind of mimo channel simulator, which is characterized in that including channel simulator radio frequency unit and channel simulator base band list
Member, the channel simulator radio frequency unit include switching switching group, RX module and TX module, the output end of the switching switching group
It is connect with the input terminal of the RX module, the input terminal of the switching switching group is connect with the output end of the TX module, described
Channel simulator Base Band Unit includes ADC module, FPGA module and DAC module, the output end of the ADC module and the FPGA
The input terminal of module connects, and the output end of the FPGA module is connect with the input terminal of the DAC module, the ADC module
Input terminal connects the RX module output end, and the output end of the DAC module connects the input terminal of the TX module.
2. a kind of mimo channel simulator according to claim 1, which is characterized in that penetrated including multiple channel simulators
Frequency unit.
3. a kind of two-way implementation method of mimo channel simulator TDD, which comprises the steps of:
Step S1: signal is transmitted to switching switching group by input terminal, switching switching group carries out logical operation, and signal is via RX mould
Block is transmitted to ADC module sampling；
Step S2: signal is sent into FPGA module by ADC module sampling, and FPGA module is implemented to realize the process of channel fading；
Step S3: signal is transmitted to DAC module, realizes digital-to-analogue conversion；
Step S4: signal reaches switching switching group after TX module after being exported by DAC module, and switching switching group carries out logic fortune
It calculates, signal is exported.
4. according to claim 1 or a kind of two-way implementation method of mimo channel simulator TDD, feature described in claim 3 exist
In: the switching switching group includes the first switching switch, the second switching switch, third switching switch and the 4th switching switch, institute
The first switching output switching terminal is stated connect with the second switching switch input terminal, the third switch output switching terminal with it is described
Second switching switch input terminal connection, the 4th switching output switching terminal switch with the first switching switch, third respectively
Switch input terminal connection, the second switching output switching terminal are connect with the input terminal of the RX module, and the 4th switching is opened
Input terminal is closed to connect with the output end of the TX module.
5. the two-way implementation method of a kind of mimo channel simulator TDD according to claim 3, which is characterized in that the logic
Calculating process are as follows: judgement is downlink signal or uplink signal, if downlink signal, then opens the first switching switch and the
The access between access and third switching switch and the 4th switch between two switching switches；If uplink signal, then
Open access between third switching switch and the four or two switching switch and the 4th switching switch and the first switching switch
Between access.
6. the two-way implementation method of a kind of mimo channel simulator TDD according to claim 4, it is characterised in that: the switching
Switching group has delay in switching, is handled with this to meet the delay register clearing inside FPGA module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711436600.2A CN109302242B (en) | 2017-12-26 | 2017-12-26 | TDD (time division duplex) bidirectional implementation method of MIMO (multiple input multiple output) channel simulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711436600.2A CN109302242B (en) | 2017-12-26 | 2017-12-26 | TDD (time division duplex) bidirectional implementation method of MIMO (multiple input multiple output) channel simulator |
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| CN109302242A true CN109302242A (en) | 2019-02-01 |
| CN109302242B CN109302242B (en) | 2022-11-22 |
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Cited By (2)
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| RU207083U1 (en) * | 2021-07-09 | 2021-10-11 | Общество С Ограниченной Ответственностью «Радио Гигабит» | MODULAR EMULATOR OF WIRELESS COMMUNICATION CHANNEL |
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| CN113573349A (en) * | 2021-09-26 | 2021-10-29 | 南京迈创立电子科技有限公司 | Performance test system and method of millimeter wave communication equipment |
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