CN102802184B - Method, device and system for simulation of wireless network channel - Google Patents
Method, device and system for simulation of wireless network channel Download PDFInfo
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- CN102802184B CN102802184B CN201110135199.5A CN201110135199A CN102802184B CN 102802184 B CN102802184 B CN 102802184B CN 201110135199 A CN201110135199 A CN 201110135199A CN 102802184 B CN102802184 B CN 102802184B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004088 simulation Methods 0.000 title abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 84
- 238000007726 management method Methods 0.000 claims description 28
- 239000013307 optical fiber Substances 0.000 claims description 11
- 238000013506 data mapping Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 238000013507 mapping Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 241001269238 Data Species 0.000 description 5
- 238000005562 fading Methods 0.000 description 5
- 230000001413 cellular effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
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- 230000007423 decrease Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- 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
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
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Abstract
The invention discloses a method, a device and a system for the simulation of a wireless network channel. The method comprises the following steps of: determining channel characteristics of the wireless network channel according to external field channel data; and transmitting baseband data between a mobile station and base stations on the basis of the channel characteristics of the wireless network channel. The device comprises a file management unit and a signal processing unit. An actual wireless network channel environment of an external field can be recreated indoors, and channel environments required by a user, such as the switching of the mobile station between the base stations and the location of the mobile station on the edge of a network can be flexibly simulated by editing the channel characteristics to verify a wireless base station system product, accelerate fault convergence and shorten time required by the performance stabilization of the wireless base station system product. By the system integrating a plurality of devices for the simulation of the wireless network channel, a plurality of base stations and mobile stations can be supported.
Description
Technical field
The present invention relates to wireless communication technique field, particularly relate to a kind of methods, devices and systems realizing radio network information channel emulation.
Background technology
In wireless channel, electric wave propagation is not single-pathway, but the synthesis of reflected wave in many paths.Because electric wave is different by the distance in each path, the reflected wave time of advent thus in each path and time delay difference.When transmitting terminal sends an extremely narrow pulse signal, the signal that travelling carriage receives is made up of the pulse signal of many different delay, is called delay spread.
Because the reflected wave time delay in each path is different, phase place is also just different.Multiple signals of out of phase are at receiving terminal superposition, and the amplitude of Received signal strength will sharply change, and namely create rapid fading.This decline is caused by multiple path, so be called multipath fading.Received signal strength, except rapid fading appears in instantaneous value, also may cause slow fading by shadow effect and meteorological reason.
Due to the mobility of travelling carriage in mobile communication, in wireless channel, also have Doppler effect.Doppler effect increases the complexity of mobile communication further.
The radio channel characteristic more than referred to, comprising multipath transmisstion, delay spread, fading characteristic and Doppler effect etc., is only the wireless channel of point-to-point.In cellular mobile telecommunications, the signal that terminal sends, except serviced base station receives, is also received by multiple neighbor base stations adjacent with serving BS, forms the up channel interference of neighbor base station; Equally, base station transmit signals, except being received by the terminal in its coverage, is also received by the terminal of adjacent area simultaneously, therefore constitutes the down channel interference of adjacent area terminal.This point-to-multipoint in cellular radio communication system, multipoint-to-point and how point-to-multipoint wireless channel environment are called radio network information channel.Radio network information channel is except changing with communication geographical environment, translational speed and except change, also have close relationship with cellular network topologies structure.
The complexity of radio network information channel, diversity and time variation bring great difficulty to wireless base system design and system parameters configuration.Usual wireless base system, before batch application, is difficult to its systematic function in a network environment of precognition.Therefore, wireless emulation technology plays important role in wireless technology in wireless system research and development.
Current wireless channel simulation technology mainly contains soft simulation technology and channel simulator technology.
Soft simulation technology: carry out wireless modeling by Software tool, Output simulation result, generally run in PC (Personal Computer, PC), soft simulation technology is generally used for off-line, nonreal time simulation.
Channel simulator technology: carry out wireless modeling by embedded system, the channel data real-time effect of modeling generation in the base band data of reality.But only can simulate point-to-point channel situation, be difficult to competent to actual channel simulation.
Summary of the invention
The technical problem to be solved in the present invention is, provides the methods, devices and systems that a kind of radio network information channel emulates, and sets up radio network information channel simulated environment in laboratory, provides support to the research and development of wireless base system.
The technical solution used in the present invention is, the device of described radio network information channel emulation, comprising:
File management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data;
Signal processing unit, for connecting travelling carriage and base station, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station.
Further, this device also comprises:
First FCU file control unit, in described channel characteristics file download to signal processing unit that file management unit is generated and timing upgrade.
Further, this device also comprises:
Interface processing unit, signal processing unit connects travelling carriage and base station by described interface processing unit, and described interface processing unit is used for carrying out base band data mapping between travelling carriage and signal processing unit and between base station and signal processing unit.
Further, described file management unit, also for generating interface base band data mapped file according to the Topology connection situation of travelling carriage and interface processing unit and base station and interface processing unit;
This device also comprises:
Second FCU file control unit, downloads in interface processing unit for interface base band data mapped file file management unit generated.
Further, described file management unit is according to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, and the channel characteristics of record radio network information channel, generates the channel characteristics file of radio network information channel.
Further, described travelling carriage is all connected by optical fiber or high speed cable with interface processing unit with interface processing unit, base station, is connected between interface processing unit with channel bank by core bus.
The system that the present invention also provides a kind of radio network information channel to emulate, comprising: the device of multiple radio network information channel emulation is linked together by respective signal processing unit, and this device comprises:
File management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data;
Signal processing unit, for connecting travelling carriage and base station, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station.
Based on the device that above-mentioned radio network information channel emulates, a kind of method that the present invention also provides radio network information channel to emulate, comprising:
According to the channel characteristics of outfield channel data determination radio network information channel;
Channel characteristics based on radio network information channel carries out channelizing process to the base band data between travelling carriage and base station.
Further, the described channel characteristics according to outfield channel data determination radio network information channel, specifically comprises:
According to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, the channel characteristics of record radio network information channel.
Further, the described channel characteristics based on radio network information channel carries out channelizing process to the base band data between travelling carriage and base station, specifically comprises:
Timing upgrades the channel characteristics of radio network information channel, carries out channelizing process based on described channel characteristics by optical fiber or high speed cable to the base band data between travelling carriage and base station.
Adopt technique scheme, the present invention at least has following advantages:
The methods, devices and systems realizing radio network information channel emulation of the present invention, can at the radio network information channel environment of reproduction outfield, indoor reality, also can by editor's channel characteristics, can the users such as analogue mobile station switches between base station neatly, travelling carriage is positioned at network edge need channel circumstance, for the checking of wireless base system product, acceleration disturbance restrains, and shortens the time that wireless base system properties of product stablize needs.By the described system that multiple described device realizing radio network information channel emulation integrates, more base station and travelling carriage can be supported.
Accompanying drawing explanation
Fig. 1 is for realizing the apparatus structure schematic diagram of radio network information channel emulation described in the first embodiment;
Fig. 2 is for realizing the apparatus structure schematic diagram of radio network information channel emulation described in the second embodiment;
Fig. 3 is for realizing the apparatus structure schematic diagram of radio network information channel emulation described in the 3rd embodiment;
Fig. 4 is for realizing the apparatus structure schematic diagram of radio network information channel emulation described in the 4th embodiment;
Fig. 5 is for realizing the system configuration schematic diagram of radio network information channel emulation described in the 5th embodiment;
Fig. 6 is for realizing the method flow diagram of radio network information channel emulation described in the 6th embodiment;
Fig. 7 is base station and travelling carriage and realize the concrete topological connection relation schematic diagram of the device that radio network information channel emulates in the 7th embodiment;
Fig. 8 is channel characteristics script schematic diagram in the 7th embodiment;
Fig. 9 is interface mappings script schematic diagram in the 7th embodiment.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in detail as after.
In order to set up radio network information channel simulated environment in laboratory, fully expose Problems existing in base station system product.Invention broadly provides a kind of device, the system and method that realize radio network information channel emulation.
First embodiment of the invention, a kind of device realizing radio network information channel emulation, as shown in Figure 1, comprises following part:
1) file management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data.This channel characteristics file can be channel characteristics script.Concrete, file management unit is according to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, and the channel characteristics of record radio network information channel, generates the channel characteristics file of radio network information channel.
2) signal processing unit, for connecting some travelling carriages and base station, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station.Concrete, travelling carriage is with channel bank, be all connected by optical fiber or high speed cable between base station with channel bank.This optical fiber and high speed cable all can transmit base band data.
Second embodiment of the invention, a kind of device realizing radio network information channel emulation, as shown in Figure 2, comprises following composition portion:
1) file management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data.This channel characteristics file can be channel characteristics script.Concrete, file management unit is according to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, and the channel characteristics of record radio network information channel, generates the channel characteristics file of radio network information channel.
2) the first FCU file control unit, in this channel characteristics file download to signal processing unit that file management unit is generated and timing upgrade.Download channels tag file is more consuming time, and the process of renewal upgrades the part changed in this channel characteristics file, and need not download channels tag file again.
3) signal processing unit, for connecting some travelling carriages and base station, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station.Concrete, travelling carriage is with channel bank, be all connected by optical fiber or high speed cable between base station with channel bank.
Third embodiment of the invention, a kind of device realizing radio network information channel emulation, as shown in Figure 3, comprises following composition portion:
1) file management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data.This channel characteristics file can be channel characteristics script.Concrete, file management unit is according to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, and the channel characteristics of record radio network information channel, generates the channel characteristics file of radio network information channel.
2) the first FCU file control unit, in this channel characteristics file download to signal processing unit that file management unit is generated and timing upgrade.
3) signal processing unit, for connecting some travelling carriages and base station by interface processing unit, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station.Concrete, travelling carriage is with interface processing unit, be all connected by optical fiber or high speed cable between base station with interface processing unit.Be connected by core bus between interface processing unit with channel bank.
4) interface processing unit, for carrying out base band data mapping between travelling carriage and signal processing unit and between base station and signal processing unit, to realize converging and Interface Matching.In the present embodiment, by increasing interface processing unit, the quantity that signal processing unit connects travelling carriage and base station can be expanded, increasing individual channel processing unit access capability, reducing devices interconnect progression.
Fourth embodiment of the invention, a kind of device realizing radio network information channel emulation, as shown in Figure 4, comprises following composition portion:
1) file management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data, and generate interface base band data mapped file according to the Topology connection situation of travelling carriage and interface processing unit and base station and interface processing unit.This channel characteristics file can be channel characteristics script.Interface base band data mapped file can be interface mappings script.Concrete, file management unit is according to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, and the channel characteristics of record radio network information channel, generates the channel characteristics file of radio network information channel.
2) the first FCU file control unit, in this channel characteristics file download to signal processing unit that file management unit is generated and timing upgrade.
3) signal processing unit, for connecting some travelling carriages and base station by interface processing unit, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station.Concrete, travelling carriage is with interface processing unit, be all connected by optical fiber or high speed cable between base station with interface processing unit.Be connected by core bus between interface processing unit with channel bank.
4) the second FCU file control unit, downloads in interface processing unit for interface base band data mapped file file management unit generated.
5) interface processing unit, for carrying out base band data mapping between travelling carriage and signal processing unit and between base station and signal processing unit, to realize converging and Interface Matching.In the present embodiment, by increasing interface processing unit, the quantity that signal processing unit connects travelling carriage and base station can be expanded, increasing individual channel processing unit access capability, reducing devices interconnect progression.
Fifth embodiment of the invention, for the system realizing radio network information channel emulation that device described in two the first embodiments connects to form, as shown in Figure 5, this system comprises following part: multiple described device is linked together by the optical fiber of respective signal processing unit or high speed cable.
Sixth embodiment of the invention, a kind of method realizing radio network information channel emulation, as shown in Figure 6, comprises the following steps:
Step S101, according to the channel characteristics of outfield channel data determination radio network information channel.Concrete, according to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, the channel characteristics of record radio network information channel.
Step S102, the channel characteristics based on radio network information channel carries out channelizing process to the base band data between travelling carriage and base station.Concrete, timing upgrades the channel characteristics of radio network information channel, carries out channelizing process based on this channel characteristics by optical fiber or high speed cable to the base band data between travelling carriage and base station.
Seventh embodiment of the invention, is described in further detail for 8 base stations, 4 travelling carriage analogue systems.Base station (being called for short bbu) is double antenna, and travelling carriage (being called for short ue) is single antenna.Base station and travelling carriage and realize the device that radio network information channel emulates concrete topological connection relation as shown in Figure 7, each interface processing unit is by intelligent acess 2 base stations and 1 travelling carriage.Due to antenna number quantitative limitation, 2 base stations transmit 2 base band datas respectively, and 1 travelling carriage transmits 1 base band data.The interface that interface processing unit and the connection between base station and travelling carriage, core bus and channel bank externally connect all possesses base band data transmission speed.Each four-headed arrow represents a connection possessing base band data transmission speed, can transmit at most four base band datas.
The process realizing radio network information channel emulation is as follows:
Step 1, the channel data file generated channel characteristics script that file management unit gathers according to outfield.
Concrete, existing channel collecting device collects channel data from outfield, and file management unit generates channel characteristics script according to the channel data gathered from outfield, if gather with the frequency keeps of setting, so will obtain channel characteristics script sequence.Fig. 8 is channel characteristics script, transmits channel characteristics sample value during base band data between the total interface wherein containing channel bank.Channel bank has 22 interfaces, therefore can transmit in 88 base band data: base band id1, base band id2 ..., base band id88, Fig. 8 the channel characteristics specifically listed when to transmit base band data between all base band.
Step 2, file management unit, according to base station and travelling carriage and the concrete topological connection relation realizing the device that radio network information channel emulates, generates interface mappings script.Interface mappings script as shown in Figure 9, can be mapped on 2 interfaces that interface processing unit is connected with core bus from travelling carriage and 5 base band datas (base band bbu1-1, base band bbu1-2, base band bbu2-1, base band bbu2-2, base band ue) of base station, namely occupy 4 base band datas of interface 1 and a base band data of interface 2.
Base band bbu1-1 and base band bbu1-2 is the base band that two antennas on the bbu1 of base station are corresponding respectively, and base band bbu2-1 and base band bbu2-2 is the base band that two antennas on the bbu2 of base station are corresponding respectively, and base band ue is the base band that the single antenna on travelling carriage ue is corresponding
Step 3, interface mappings script downloads in interface processing unit by the first FCU file control unit.
Step 4, channel characteristics script sequence downloads in channel bank by the second FCU file control unit.
Step 5,5 base band datas from travelling carriage and base station, according to interface mappings script, converge on 2 interfaces that interface processing unit is connected with core bus by mapping by interface processing unit.
Step 6, channel bank receives base band data by core bus, carries out network channel synthesis according to channel characteristics script, by same base station associated channel characteristic superposition, is then transferred in the corresponding base band of backboard through network channel by base band data.
Step 7, interface processing unit, according to interface mappings script, is mapped to the base band data on backboard on the interface that interface processing unit is connected with travelling carriage or base station.
The methods, devices and systems realizing radio network information channel emulation of the present invention, by editor's channel characteristics, can the users such as analogue mobile station switches between base station neatly, travelling carriage is positioned at network edge need channel circumstance, for the checking of wireless base system product, acceleration disturbance restrains, and shortens the time that wireless base system properties of product stablize needs.By the described system that multiple described device realizing radio network information channel emulation integrates, more base station and travelling carriage can be supported.
By the explanation of embodiment, should to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, but appended diagram be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
Claims (9)
1. a device for radio network information channel emulation, is characterized in that, comprising:
File management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data;
Signal processing unit, for connecting travelling carriage and base station, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station;
Interface processing unit, signal processing unit connects travelling carriage and base station by described interface processing unit, and described interface processing unit is used for carrying out base band data mapping between travelling carriage and signal processing unit and between base station and signal processing unit.
2. the device of radio network information channel emulation according to claim 1, it is characterized in that, described device also comprises:
First FCU file control unit, in described channel characteristics file download to signal processing unit that file management unit is generated and timing upgrade.
3. the device of radio network information channel emulation according to claim 1, it is characterized in that, described file management unit, also for generating interface base band data mapped file according to the Topology connection situation of travelling carriage and interface processing unit and base station and interface processing unit;
Described device also comprises:
Second FCU file control unit, downloads in interface processing unit for interface base band data mapped file file management unit generated.
4. the device of radio network information channel emulation according to claim 1, it is characterized in that, described file management unit is according to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, the channel characteristics of record radio network information channel, generates the channel characteristics file of radio network information channel.
5. the device of radio network information channel emulation according to claim 1, it is characterized in that, described travelling carriage is all connected by optical fiber or high speed cable with interface processing unit with interface processing unit, base station, is connected between interface processing unit with channel bank by core bus.
6. a system for radio network information channel emulation, is characterized in that, comprising: the device of multiple radio network information channel emulation is linked together by respective signal processing unit, and described device comprises:
File management unit, for generating the channel characteristics file of radio network information channel according to outfield channel data;
Signal processing unit, for connecting travelling carriage and base station, and carries out channelizing process based on the channel characteristics file of radio network information channel to the base band data between travelling carriage and base station;
Interface processing unit, signal processing unit connects travelling carriage and base station by described interface processing unit, and described interface processing unit is used for carrying out base band data mapping between travelling carriage and signal processing unit and between base station and signal processing unit.
7. a method for radio network information channel emulation, is characterized in that, comprising:
File management unit is according to the channel characteristics of outfield channel data determination radio network information channel;
Signal processing unit carries out channelizing process based on the channel characteristics of radio network information channel to the base band data between travelling carriage and base station;
Signal processing unit connects travelling carriage and base station by interface processing unit, and described interface processing unit is used for carrying out base band data mapping between travelling carriage and signal processing unit and between base station and signal processing unit.
8. the method for radio network information channel emulation according to claim 7, it is characterized in that, the described channel characteristics according to outfield channel data determination radio network information channel, specifically comprises:
According to the channel data gathered in live network channel circumstance or channel circumstance model Network Based, the channel characteristics of record radio network information channel.
9. the method for radio network information channel emulation according to claim 7 or 8, it is characterized in that, the described channel characteristics based on radio network information channel carries out channelizing process to the base band data between travelling carriage and base station, specifically comprises:
Timing upgrades the channel characteristics of radio network information channel, carries out channelizing process based on described channel characteristics by optical fiber or high speed cable to the base band data between travelling carriage and base station.
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| CN201110135199.5A CN102802184B (en) | 2011-05-24 | 2011-05-24 | Method, device and system for simulation of wireless network channel |
| PCT/CN2011/077960 WO2012159365A1 (en) | 2011-05-24 | 2011-08-03 | Method, device and system for implementing wireless network channel simulation |
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| CN201110135199.5A CN102802184B (en) | 2011-05-24 | 2011-05-24 | Method, device and system for simulation of wireless network channel |
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| CN102802184B true CN102802184B (en) | 2015-06-03 |
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| CN105992234B (en) * | 2015-02-15 | 2021-03-16 | 中兴通讯股份有限公司 | A method and system for simulating a borderless network channel environment |
| CN108039931B (en) * | 2017-12-11 | 2020-10-23 | 上海埃威航空电子有限公司 | Simulation test system of medium-high frequency communication channel based on geographic information |
| CN111721912B (en) * | 2020-06-30 | 2023-02-03 | 贵州省煤矿设计研究院有限公司 | Device and method for rapidly measuring gas pressure and gas content of coal seam |
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| EP1022872A2 (en) * | 1999-01-19 | 2000-07-26 | Lucent Technologies Inc. | Apparatus and method for providing a radio environment to test wireless communications equipment |
| CN1528062A (en) * | 2001-02-21 | 2004-09-08 | ���Ͽع�����˾ | Method and device for simulating wireless channel |
| CN1645822A (en) * | 2004-12-15 | 2005-07-27 | 西安电子科技大学 | Environmental simulator for high-speed communicating network |
| CN101552997A (en) * | 2009-05-15 | 2009-10-07 | 北京威讯紫晶科技有限公司 | Analogy method of single channel wireless data exchanging space in a wireless network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6339842B1 (en) * | 1998-06-10 | 2002-01-15 | Dennis Sunga Fernandez | Digital television with subscriber conference overlay |
| CN1588933A (en) * | 2004-09-10 | 2005-03-02 | 深圳市中实科技有限公司 | Digital demodulation receiver |
| CN1773970B (en) * | 2004-11-11 | 2010-04-28 | 联想(北京)有限公司 | Method for determining short-distance radio network information channel |
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- 2011-05-24 CN CN201110135199.5A patent/CN102802184B/en active Active
- 2011-08-03 WO PCT/CN2011/077960 patent/WO2012159365A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1022872A2 (en) * | 1999-01-19 | 2000-07-26 | Lucent Technologies Inc. | Apparatus and method for providing a radio environment to test wireless communications equipment |
| CN1528062A (en) * | 2001-02-21 | 2004-09-08 | ���Ͽع�����˾ | Method and device for simulating wireless channel |
| CN1645822A (en) * | 2004-12-15 | 2005-07-27 | 西安电子科技大学 | Environmental simulator for high-speed communicating network |
| CN101552997A (en) * | 2009-05-15 | 2009-10-07 | 北京威讯紫晶科技有限公司 | Analogy method of single channel wireless data exchanging space in a wireless network |
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| WO2012159365A1 (en) | 2012-11-29 |
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