CN103138855A - Device and method of wireless network channel simulation based on external field measured data - Google Patents
Device and method of wireless network channel simulation based on external field measured data Download PDFInfo
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Abstract
The invention provides a device and a method of wireless network channel simulation based on external field measured data. The method comprises collecting channel fading data of each base station and each user terminal of a network, and carrying out analysis on each channel fading data to form channel parameters needed in the channel simulation; receiving signals sent by corresponding base station antennas according to a simulated scene when the channel simulation is carried out on a scene, carrying out channelized processing on the received signals with the corresponding channel parameters of the scene, and outputting the processed signals from a corresponding output end. According to the technical scheme of the device and the method of the wireless network channel simulation based on the external field measured data, not only can the signals be processed on a base band, but also radio frequency data can be processed, and the channel scenarios used for simulation all root in real external environment, thus practical external environment can be simulated more really, and the purpose of achieving an external field test in a laboratory can be reached.
Description
Technical field
The present invention relates to field of wireless communication, relate in particular to analogue means and the method for complicated outfield radio network information channel.
Background technology
The propagation properties of wireless channel relevant with communication environments (geographical feature, building, electromagnetic interference, employing frequency range etc.), general, we think that wireless channel has large scale decline and two kinds of features of multipath fading, wherein decay or the path loss of the average received signal power that travelling carriage causes through larger distance moving has been portrayed in large scale decline, two influencing factors is arranged: path loss and shadow fading.Path loss refers to electric wave propagation loss spatially; Shadow fading refers to that electric wave runs into the shadow region that the obstruct of tall and big barrier can generate an electromagnetic field in communication process, when travelling carriage passes the shadow region, and variation that can the priming signal median of field strength; Generally, there is not direct signal between base station and travelling carriage, the signal that receives is generally the superposed signal that transmits through after several times diffraction, scattering, reflection, transmission, refraction, and sort signal is called multipath transmisstion through the phenomenon that different propagation paths reach receiving terminal.Multipath transmisstion causes the broadening of signal waveform, produces frequency selective fading; Doppler effect affects the time-varying characteristics of channel, and the Doppler frequency deviation that produces because of translational speed causes signal spectrum to spread in certain scope, the decline of generation time selectivity.This multipath fading can cause the power fading of signal tens dB.Simultaneously, radio network information channel also is subject to the impact of co-channel interference in the impact of various electromagnetic interference and networking.
Configuration has increased difficulty to wireless network planning and system parameters for this complexity of radio network information channel and time variation, makes system testing can't cover various complex scenes in practical application.Wireless telecommunications system (as base station, terminal) is after the laboratory development is completed the property indices test, need to carry out network test in the actual wireless channel circumstance, for stability and the maturity of verifying wireless telecommunications system, generally need to open up fairly large Pilot office, with the reasonability of the checking network planning and system parameter setting, abundant exposing product defective in actual applications.This checking and test mode construction cycle are longer, and input is larger, is unfavorable for the commercial ability of wireless product is verified fast.
In the prior art, one of them has proposed a kind of radio channel simulating method and device, can carry out multipath fading to baseband signal and process, but the slow fading that it can not processing signals can not be processed signal at radio frequency; Another prior art has proposed system for testing multi-path fading and the method for testing thereof of mobile terminal in a kind of mobile communication network, and its characteristics are to measure radio network information channel, but and be indifferent to the channel characteristics of measurement; Also have a prior art to propose a kind of mimo channel analogue means, this device has been considered decline and the space selective fading on time and frequency simultaneously, can simulate the hyperspace parameter, but it is only the theoretical parameter analog computation, and real external field environment there is larger difference.
Comprehensive prior art is divided into two kinds of soft simulation and hard emulation with the simulation of wireless channel.Wherein soft simulation based on the channel model of industry classics, carries out analog approximation by the mode of mathematical modeling to wireless channel, and its defective is that these channel models are only the modelings to the classic applications scene, can't reproduce diversity and the complexity of channel really; Hard emulation is based on the wireless channel simulation device, the wireless channel simulation device can produce channel parameter according to channel model, also can download the image data of actual channel, this mode has simulated effect preferably to point-to-point wireless channel simulation, but the simulation capacity to radio network information channel is relatively poor, generally to adopt the cascade of a plurality of wireless channel simulation device to complete (as shown in Figure 1), because the channel simulator volume is larger, stationary problem between signal in addition is even cascade also can only realize network analog among a small circle.
Summary of the invention
in order to address the above problem, the present invention proposes a kind of method and apparatus that builds the radio network information channel simulated environment in the laboratory, the data that utilization gathers from the actual channel environment, base station to the laboratory, signal between the travelling carriage group is simulated external field environment and is processed, by the control to the channel script, can realize flexibly single antenna, various interference simulation tests under many antennas (MIMO:multiple input multiple output) channel and complex network environment, the channel circumstance of best coupling outfield reality, build the virtual wireless network environmental testing in the laboratory, the performance of evaluating system product, play the test function of sweeping experiment office.
The object of the invention is to, the method and apparatus of the radio network information channel simulation in a kind of laboratory is proposed, by the channel data collection to the real network environment, at Laboratory Restructuring and reflect the genuine property of actual outfield wireless network, build the performance of virtual wireless network environmental testing, evaluating system product.
The invention provides a kind of radio network information channel analogy method based on the outfield measured data, comprising:
Gather the channel fading data of each base station and each user terminal in wireless network, and to each channel fading data analysis, required channel parameter during the formation channel simulation; When one scene is carried out channel simulation, receive according to the scene of simulating the signal that the respective base station antenna sends, and with the ginseng number of channel corresponding to this scene, the signal that receives is carried out channelizing and process rear from corresponding output port output.
Further, before the signal that receives is carried out the channelizing processing, generate the test script of correspondence according to the scene of need simulation, comprise the input script, export script and channel script;
Described input script need under current scene to refer to basic station number and day wire size used;
Described output script is one group of terminal and day wire size under current scene;
Described channel script is channel parameter, comprise slowly decline, each multipath declines soon, each declines soon relative time delay.
Further, described method also comprises: receive the signal of respective base station antenna transmission and the base band data that antenna alignment order buffer memory receives according to the input script.
Further, if the radiofrequency signal that the antenna for base station that receives sends is converted to described radiofrequency signal buffer memory after base band data.
Further, describedly the signal that receives is carried out channelizing process and refer to:
Read signal and the corresponding channel parameter of buffer memory according to the input script, then carry out in such a way computing:
Multiply by with base band data the value that declines slowly and obtain W1, then multiply by respectively W1 with each footpath value that declines soon, be provided with n the value that declines soon, each value that declines soon all multiplies each other with W1 and obtains W21, W22...W2n, then, corresponding W2i is done time delay processing obtain respectively W31, W32...W3n with each footpath time delay that declines soon, at last W31, W32...W3n are carried out overlap-add procedure;
Described 1≤i≤n.
Further, the signal after described will the processing refers to from corresponding output port output: according to the output script, with the terminal prot output of the signal after processing from correspondence.
The present invention also provides a kind of radio network information channel analogue means based on the outfield measured data;
Described device comprises that channel script management controls backstage, channelizing processing module, input base band control module and output base band control module;
The backstage is controlled in the management of described channel script, is used for the channel data that the outfield that receives gathers is analyzed required channel parameter when obtaining channel simulation;
Described input base band control module is used for receiving base band data and the buffer memory that antenna for base station sends;
Described channelizing processing module is used for reading base band data and the corresponding channel parameter of corresponding scene, and the signal after according to described channel parameter, base band data being carried out channelizing and processes after transmission processing is to exporting the base band control module;
Described output base band control module, the signal after being used for processing exports corresponding terminal prot to.
Further, described device comprises that also the channel data classification issues module, is used for extracting corresponding channel parameter and forming test script according to the scene of simulation;
Described test script comprises input script, output script and channel script;
Described input script need under current scene to refer to basic station number and day wire size used;
Described output script is one group of terminal and day wire size under current scene;
Described channel script is channel parameter, comprise slowly decline, each multipath declines soon, each declines soon relative time delay;
Described channel data classification issues module and also is issued to input base band control module for inputting script, will export script and be issued to output script control module, and the channel script is issued to the channelizing processing module.
Further, described device also comprises the radio frequency processing module, and the radiofrequency signal that the antenna for base station that is used for receiving sends is sent to input base band control module after being converted to base band data.
Further, described input base band control module receives base band data and the buffer memory that antenna for base station sends and refers to: input base band control module receives according to the input script signal that the respective base station antenna sends, and the signal that receives according to antenna clooating sequence buffer memory.
Further, described channelizing processing module is carried out the channelizing processing and referred to: channelization block reads base band data and the corresponding channel parameter of buffer memory, multiply by with base band data the value that declines slowly and obtain W1, then multiply by respectively W1 with each footpath value that declines soon, be provided with n the value that declines soon, each value that declines soon all multiplies each other with W1 and obtains W21, W22...W2n, then, corresponding W2i is done time delay processing obtain respectively W31, W32...W3n with each footpath time delay that declines soon, at last W31, W32...W3n are carried out overlap-add procedure;
Described 1≤i≤n.
Further, the signal after described output base band control module will be processed exports corresponding terminal prot to and refers to: output base band control module is exported result according to the output script from the terminal prot of correspondence.
Compared with prior art, the radio network information channel analogue means of the present invention's proposition has following advantage: support simultaneously point-to-point emulation (single-input single-output situation) and network level emulation (multiple-input and multiple-output situation); Both can process signal in base band, also can process rf data, can either simulate the slow fading of outer field signal, also simulating multi-path rapid fading simultaneously, and can provide the channel simulation of network level, and the channel script that is used for simulation all derives from real external field environment, can simulate by more real external field environment to reality like this, reaches the purpose that just can realize field testing in the laboratory.
Description of drawings
Fig. 1 is the schematic diagram that in prior art, channel simulator is built wireless network;
Fig. 2 is the structural representation of radio network information channel analogue means of the present invention;
Fig. 3 is the flow chart of network channel simulation in the inventive method embodiment;
Fig. 4 is that in the embodiment of the present invention, channel parameter matrix represents intention;
Fig. 5 is that in the embodiment of the present invention, structure chart is processed in channelizing;
Fig. 6 is point-to-point channel simulation exemplary plot in application example one of the present invention and application example two;
Fig. 7 is the wireless network architecture schematic diagram in application example three of the present invention.
Embodiment
The invention provides a kind of radio network information channel analogue means and method based on the outfield measured data, the channel fading data of each base station and each user terminal in the collection wireless network, and to each channel fading data analysis, required parameter when forming channel simulation; When one scene is carried out channel simulation, receive according to the scene of simulating the signal that the respective base station antenna sends, and with parameter corresponding to this scene, the signal that receives is carried out channelizing and process rear from corresponding output port output.
Device embodiment
The basic structure of radio network information channel analogue means of the present invention as shown in Figure 2, comprise that the backstage is controlled in the management of channel script, the channel data classification issues module, channelizing processing module, input base band control module, output base band control module and radio frequency processing module and forms, wherein the function of each several part is expressed as follows:
The management of channel script is controlled the backstage (as computer, server etc.): be used for analyzing the channel data that outfield channel data acquisition system gathers, determine power delay profile, power azimuth spectrum distribution, channel space correlation, the large scale decline feature of multipath channel etc., with outfield actual channel network abstract be concrete large scale fading parameter and multipath fading parameter group, the large scale fading parameter is that the data that collect are carried out smoothing processing, then extracts its amplitude characteristic; Multipath fading is exactly the characteristics such as frequency according to signal, isolates its channel multi-path component, the power that then extracts and deferred message.Namely produce the data combination of the rapid fading that can characterize actual channel and slow fading parameter.
Channel data classification issues module: the needs of the data based current Channel Processing that the backstage the is produced scene of current needs simulation (namely according to) generate test script, comprise input script (being the input control parameter), output script (i.e. parameter is controlled in output) and channel script (being channel parameter); And will input script, output script and channel script are issued to respectively input base band control module, output base band control module and channelizing processing module; Wherein, the input script is to need the basic station number used and day wire size under current scene; The output script is one group of UE and day wire size under current scene; The channel script comprise slowly decline, each multipath declines soon, each declines soon parameters such as relative time delay.
input base band control module, be used for the input extracting data required antenna for base station data of input script from receiving according to buffer memory, and require to arrange and buffer memory according to antenna, namely according to the actual scene that will simulate, the base band data of selecting the antenna in this scene related base station to send, the data that each antenna is sent are stored to respectively in different buffering areas for channel processing module, such as certain scene relates to base station 1, base station 2 and base station 4, and base station 1 comprises antenna 1, base station 2 comprises antenna 1 and antenna 2, base station 4 comprises antenna 3, input base band control module sequentially lines up 12 34 with the base band data that these 4 antennas send.
Channelizing processing module: read in real time the base band data of respective antenna in corresponding buffering area according to the input control parameter, read simultaneously channel parameter corresponding to current scene and carry out computing, and operation result is sent to output base band control module;
Particularly, compute mode is: multiply by with base band data the value that declines slowly and obtain W1, then multiply by respectively W1 with each footpath value that declines soon, if any n the value that declines soon, each value that declines soon all multiplies each other with W1 and obtains W21, W22...W2n, then, corresponding W2i is done time delay processing obtain respectively W31, W32...W3n with each footpath time delay that declines soon, at last W31, W32...W3n are carried out overlap-add procedure.
Output base band control module according to actual scene, outputs to the operation result that receives on the antenna of corresponding UE when being used for output, is about to the related antenna of scene and outputs on the antenna of corresponding UE through the signal after Channel Processing.
The radio frequency processing module when being used for existing radio frequency part to need process radiofrequency signal when the base station with UE, being converted to the radiofrequency signal of the antenna for base station transmission that receives to be sent to after baseband signal and inputting the base band control module; When also being used for sending, converting baseband signal to radiofrequency signal and send into UE.
If base station and UE only have baseband portion, this device can pass through fiber direct connection so, directly in baseband portion and base station and UE communication.
Embodiment of the method
The performing step of radio network information channel analogue means of the present invention as shown in Figure 3, detailed process is:
Step S1, the channel fading data of each base station and each user terminal (or channel collecting device) in the collection actual wireless network, the moving line of user terminal will cover whole wireless network environment as much as possible, and acquisition time is wanted long enough;
Step S2 carries out analyzing and processing to the channel data after gathering, required every channel parameter when obtaining Channel Processing.
For each channel data, be desirable channel parameter with outfield actual channel data abstraction, the parameters such as relative time delay that declined slowly, each multipath decline soon, each declines soon; Particularly, for large scale decline feature, need to carry out the impact that smoothing processing is eliminated interference noise to data, then extract its amplitude characteristic; For the multipath fading feature, according to the characteristics such as frequency of signal, need the segregated channel multipath component, extract power-delay information, finally be made into a channel parameter matrix table, as shown in Figure 4.
Step S3: generate test script according to the current scene of simulation that needs, and Data classification is issued;
Particularly, according to the current scene that needs simulation, extract corresponding data from the backstage and generate test script, comprise input script (being the input control parameter), output script (i.e. parameter is controlled in output) and channel script (being channel parameter); And will input script, output script and channel script are issued to respectively input base band control module, output base band control module and channelizing processing module; Wherein, the input script is to need the basic station number used and day wire size under current scene; The output script is one group of UE and day wire size under current scene; The channel script comprise slowly decline, each multipath declines soon, each declines soon parameters such as relative time delay.Then will input script and be issued to input base band control module, will export script and be issued to output base band control module, the channel script will be issued to the channelizing processing module.
As shown in Figure 4, numbering corresponding to perpendicular row right side, base station is the input slogan, walks crosswise numbering corresponding to UE downside and is the output slogan.Channel value in the middle of table under the corresponding corresponding input-output mappings relation of H value indication, each H value include the declining slowly of this channel data, multipath declines soon and the time delay of the correspondence that declines soon.Final this part can be with input number, output number, and the value that declines slowly, the value that declines soon in each footpath, the time delay that declines soon deposits respectively different buffering buffer in, reads during the wait Channel Processing.
Step S4: receive signal and the storage that the respective base station antenna is sent according to the input script; Particularly, determine the antenna for base station port according to the input script, then receive the signal that this port sends, if what receive is radiofrequency signal, store after first radiofrequency signal being converted to baseband signal, if what receive is directly storage of baseband signal, during storage according to the antenna alignment sequential storage of input script specifies.
Step S5: the signal after after channelizing is processed, output is processed.As shown in Figure 5, this part is the core of this device, and concrete steps are as follows:
At first, read the input data of buffer stores, and read corresponding channel script (being channel parameter), then according to channel parameter, the input data are carried out computing; Operation method is: multiply by with base band data the value that declines slowly and obtain W1, then multiply by respectively W1 with each footpath value that declines soon, if any n the value that declines soon, each value that declines soon all multiplies each other with W1 and obtains W21, W22...W2n, then, corresponding W2i is done time delay processing obtain respectively W31, W32...W3n with each footpath time delay that declines soon, at last W31, W32...W3n are carried out overlap-add procedure;
At last, according to the output script, the data after channelizing is processed are sent into corresponding output port.
Further,
If the test script that current scene needs is real-time change, needs to generate in real time test script according to current scene, and receive corresponding signal and read corresponding channel parameter signal is processed according to test script.
The below lifts several execution modes typical applicable cases more of the present invention is described:
Application example one: point-to-point channel simulation.
As shown in Figure 6, in the situation that only have a base station and a UE, the transmitting antenna of this base station sends rf data to eating dishes without rice or wine, and the radio frequency unit of this equipment converts the rf data that receives to base band data, sends into input base band control module; Then, needs according to test, choose the H value that antenna for base station port required under corresponding scene and terminal prot form, this H value is formed test script control the backstage from the management of channel script, classifying by channel data issues module, resolves into the input script, output script and channel script, and send into respectively input base band control module, output base band control module and channelizing processing module; The channelizing processing module is carried out comprehensive computing according to above-mentioned Channel Processing algorithm with above-mentioned data, then exports to the radio frequency processing module, sends at last and eats dishes without rice or wine; Finally, UE has received the data of processing through channelizing.By controlling the variation of background script, can simulate the channel situation under several scenes.
Application example two: the channel simulation of baseband signal.
As shown in Figure 6, base station or UE also can carry out simulation test by radio network information channel analogue means of the present invention when there is no radio-frequency apparatus; At this moment, radio frequency unit of the present invention can be bypassed, the baseband signal of base station be connected the input baseband processing module and take the mode of fiber direct connection to connect; Same output baseband processing module also adopts the mode of fiber direct connection to connect with the UE of not being connected with radio frequency.Same, also can be by the channel variance situation of background script change modeling several scenes.
Wireless network simulation in three: three residential quarter two UE situations of application example.
As shown in Figure 7, in the situation that three base stations and two UE, the transmitting antenna of these three base stations sends rf data to eating dishes without rice or wine, the radio frequency unit of this equipment converts the rf data that receives to base band data, send into input base band control module, the base band control module is numbered sequence to the base band data that enters according to certain rule, base station 1, base station 2, base station 3; Then, needs according to test, certain test script is controlled the backstage from the management of channel script, classify by channel data and issue module, resolve into the input script, output script and channel script, and send into respectively input base band control module, output base band control module and channelizing processing module; Input processing module is according to the variation of the input of script number, in the different time with different base station signal combinatorial inputs to channel processing module; The channelizing processing module is carried out comprehensive computing according to above-mentioned Channel Processing algorithm with above-mentioned data, sends into the output baseband processing module; The data that the output baseband processing module number will be processed according to script output are passed through the radio frequency processing module, send to eating dishes without rice or wine of correspondence; Finally, each UE has received a base station of correspondence or the data that processed through channelizing several base station.By controlling the variation of background script, can simulate the various scenes of two UE under 3 base station networks, comprise the residential quarter switching, face district's interference variations, the comp that cell edge strengthens etc.
Be noted that at last above-mentioned description for preferred embodiment of the present invention is comparatively concrete, can not therefore think limiting the scope of the invention, protection scope of the present invention should be as the criterion with claims.
Claims (12)
1. radio network information channel analogy method based on the outfield measured data comprises:
Gather the channel fading data of each base station and each user terminal in wireless network, and to each channel fading data analysis, required channel parameter during the formation channel simulation; When one scene is carried out channel simulation, receive according to the scene of simulating the signal that the respective base station antenna sends, and with the ginseng number of channel corresponding to this scene, the signal that receives is carried out channelizing and process rear from corresponding output port output.
2. the method for claim 1 is characterized in that:
Before the signal that receives is carried out the channelizing processing, generate the test script of correspondence according to the scene of need simulation, comprise the input script, export script and channel script;
Described input script need under current scene to refer to basic station number and day wire size used;
Described output script is one group of terminal and day wire size under current scene;
Described channel script is channel parameter, comprise slowly decline, each multipath declines soon, each declines soon relative time delay.
3. method as claimed in claim 2 is characterized in that:
Described method also comprises: receive the signal of respective base station antenna transmission and the base band data that antenna alignment order buffer memory receives according to the input script.
4. method as claimed in claim 2, is characterized in that, described method also comprises:
If the radiofrequency signal that the antenna for base station that receives sends is converted to described radiofrequency signal buffer memory after base band data.
5. method as described in claim 3 or 4 is characterized in that:
Described signal to reception carries out the channelizing processing and refers to:
Read signal and the corresponding channel parameter of buffer memory according to the input script, then carry out in such a way computing:
Multiply by with base band data the value that declines slowly and obtain W1, then multiply by respectively W1 with each footpath value that declines soon, be provided with n the value that declines soon, each value that declines soon all multiplies each other with W1 and obtains W21, W22...W2n, then, corresponding W2i is done time delay processing obtain respectively W31, W32...W3n with each footpath time delay that declines soon, at last W31, W32...W3n are carried out overlap-add procedure;
Described 1≤i≤n.
6. method as described in claim 3 or 4 is characterized in that:
Signal after described will the processing refers to from corresponding output port output: according to the output script, with the terminal prot output of the signal after processing from correspondence.
7. radio network information channel analogue means based on the outfield measured data is characterized in that:
Described device comprises that channel script management controls backstage, channelizing processing module, input base band control module and output base band control module;
The backstage is controlled in the management of described channel script, is used for the channel data that the outfield that receives gathers is analyzed required channel parameter when obtaining channel simulation;
Described input base band control module is used for receiving base band data and the buffer memory that antenna for base station sends;
Described channelizing processing module is used for reading base band data and the corresponding channel parameter of corresponding scene, and the signal after according to described channel parameter, base band data being carried out channelizing and processes after transmission processing is to exporting the base band control module;
Described output base band control module, the signal after being used for processing exports corresponding terminal prot to.
8. device as claimed in claim 7 is characterized in that:
Described device comprises that also the channel data classification issues module, is used for extracting corresponding channel parameter and forming test script according to the scene of simulation;
Described test script comprises input script, output script and channel script;
Described input script need under current scene to refer to basic station number and day wire size used;
Described output script is one group of terminal and day wire size under current scene;
Described channel script is channel parameter, comprise slowly decline, each multipath declines soon, each declines soon relative time delay;
Described channel data classification issues module and also is issued to input base band control module for inputting script, will export script and be issued to output script control module, and the channel script is issued to the channelizing processing module.
9. device as claimed in claim 7 is characterized in that:
Described device also comprises the radio frequency processing module, and the radiofrequency signal that the antenna for base station that is used for receiving sends is sent to input base band control module after being converted to base band data.
10. install as claimed in claim 8 or 9, it is characterized in that:
Described input base band control module receives base band data and the buffer memory that antenna for base station sends and refers to: input base band control module receives according to the input script signal that the respective base station antenna sends, and the signal that receives according to antenna clooating sequence buffer memory.
11. device as claimed in claim 8 is characterized in that:
Described channelizing processing module is carried out the channelizing processing and referred to: channelization block reads base band data and the corresponding channel parameter of buffer memory, multiply by with base band data the value that declines slowly and obtain W1, then multiply by respectively W1 with each footpath value that declines soon, be provided with n the value that declines soon, each value that declines soon all multiplies each other with W1 and obtains W21, W22...W2n, then, corresponding W2i is done time delay processing obtain respectively W31, W32...W3n with each footpath time delay that declines soon, at last W31, W32...W3n are carried out overlap-add procedure;
Described 1≤i≤n.
12. device as claimed in claim 8 is characterized in that:
Signal after described output base band control module will be processed exports corresponding terminal prot to and refers to: output base band control module is exported result according to the output script from the terminal prot of correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210037012.2A CN103138855B (en) | 2011-11-29 | 2012-02-17 | A kind of radio network information channel analog based on outfield measured data and method |
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| CN2011103873947 | 2011-11-29 | ||
| CN201110387394.7 | 2011-11-29 | ||
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| CN201210037012.2A CN103138855B (en) | 2011-11-29 | 2012-02-17 | A kind of radio network information channel analog based on outfield measured data and method |
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| CN110855385A (en) * | 2019-11-27 | 2020-02-28 | 深圳格林帕科技有限公司 | Hard simulation equipment aiming at dynamic wireless environment of mobile equipment of Internet of things |
| CN111601331A (en) * | 2020-05-15 | 2020-08-28 | Oppo广东移动通信有限公司 | Terminal test method, terminal test device, test equipment and storage medium |
| CN114374451A (en) * | 2022-01-10 | 2022-04-19 | 中国人民解放军国防科技大学 | Large-scale MIMO channel simulation method and device based on optical matrix switching |
| CN114374451B (en) * | 2022-01-10 | 2023-08-22 | 中国人民解放军国防科技大学 | Large-scale MIMO channel simulation method and device based on optical matrix switching |
| CN115189791A (en) * | 2022-09-08 | 2022-10-14 | 浙江万胜智能科技股份有限公司 | Method and system for improving data accuracy of communication module of intelligent electric meter |
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