CN102791022B - Method and device for preprocessing field channel data - Google Patents
Method and device for preprocessing field channel data Download PDFInfo
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- CN102791022B CN102791022B CN201110130677.3A CN201110130677A CN102791022B CN 102791022 B CN102791022 B CN 102791022B CN 201110130677 A CN201110130677 A CN 201110130677A CN 102791022 B CN102791022 B CN 102791022B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
Abstract
The invention discloses a method and device for preprocessing field channel data. The method includes dividing a total power of received signals from all base stations at the same time by any one mobile station and a preset target power to obtain an adjustment factor at the time; and determining channel characteristics of the channel according to the adjustment factor and an attenuation value of a channel between every base station and the mobile station. With the invention, the loss of signal resulting from the digital simulation of channel data processing is avoided in the case that relative amount of the signal components received by the mobile station and the base station is invariable, and the generated adjustment factor may be flexibly allocated within dynamic range. With the adoption of method, it is ensured that the channel simulation system processes the channel condition of small signal plus noise without distortion. According to the invention, through flexibly allocating different scaling target powers, the channel characteristics are consistent with the real attenuation, and the total signal attenuation is controlled in a reasonable range as well.
Description
Technical field
The present invention relates to wireless communication technique field, particularly relate to a kind of outfield channel data preprocess method and device.
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, radio network information channel emulation technology plays important role in wireless technology in wireless system research and development.
In radio network information channel simulation process, must according to actual outfield channel situation analog wireless networks channel, therefore, how to process to extract the channel characteristics for analog wireless networks channel to the outfield channel data collected, just become the key technology of radio network information channel emulation.At present, actual channel dynamic range is at more than 80db, if directly namely carry out great dynamic range process to the channel data collected in Digital Simulation System extracts channel characteristics, due to Digital Simulation System process is the data of fixing bit wide, the problem producing channel loss can be caused, cannot ensure that the dynamic range of simulated channel is consistent with actual channel decline.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of outfield channel data preprocess method and device, avoids producing channel loss when radio network information channel emulates, and then radio network information channel emulation is consistent with actual channel.
The technical solution used in the present invention is, described outfield channel data preprocess method, comprising:
Arbitrary travelling carriage is divided by the Received signal strength gross power of all base stations and the target power of setting at synchronization, obtains the Dynamic gene in described moment;
According to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel.
Further, described arbitrary travelling carriage is obtained as follows in the process of synchronization to the Received signal strength gross power of all base stations:
The signal power of arbitrary travelling carriage in each base station that synchronization receives is read from the channel data that outfield collects;
The Received signal strength gross power of travelling carriage to all base stations is obtained to the signal power summation of each base station received.
Further, described according to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel, specifically comprise:
The pad value of channel between each base station and travelling carriage is obtained by the signal power that each base station actual transmit signal power deducts the corresponding base station that travelling carriage receives;
Based on described Dynamic gene, the pad value of channel between each base station and travelling carriage is adjusted, obtain the channel characteristics of described channel.
Further, as the optional technical scheme of one, when channel exists multi-path transmission between each base station and travelling carriage, obtain described arbitrary travelling carriage as follows in the process of synchronization to the Received signal strength gross power of all base stations:
The signal power of arbitrary travelling carriage in the Zhong Ge path, each base station that synchronization receives is read from the channel data that outfield collects;
The Received signal strength gross power of travelling carriage to all base stations is obtained to the signal power summation in the Zhong Ge path, each base station received.
Further, described according to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel, specifically comprise:
Each path attenuation value of channel between each base station and travelling carriage is obtained by the signal power that each base station actual transmit signal power deducts each path of corresponding base station that travelling carriage receives;
Adjust based on each path attenuation value of described Dynamic gene to channel between each base station and travelling carriage, obtain each path channel feature of described channel.
Further, described target power is the maximum of the actual transmit signal power of each base station.
Further, the range of choice of described target power is: the maximum-10db of the actual transmit signal power of each base station arrives the maximum of the actual transmit signal power of each base station.
The present invention also provides a kind of outfield channel data preprocess method, comprising:
Is divided by the Received signal strength gross power of all travelling carriages and the target power of setting at synchronization in arbitrary base station, obtains the Dynamic gene in described moment;
The channel characteristics of described channel is determined according to the pad value of channel between described Dynamic gene and each travelling carriage to base station.
The present invention also provides a kind of outfield channel data pretreatment unit, comprising:
Scaling unit, for being divided by the Received signal strength gross power of all base stations and the target power of setting at synchronization by arbitrary travelling carriage, obtains the Dynamic gene in described moment;
Channel characteristics extraction unit, for according to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel.
The present invention also provides a kind of outfield channel data pretreatment unit, comprising:
Scaling unit, for being divided by the Received signal strength gross power of all travelling carriages and the target power of setting at synchronization arbitrary base station, obtains the Dynamic gene in described moment;
Channel characteristics extraction unit, for according to Dynamic gene and between each travelling carriage and base station the pad value of channel determine the channel characteristics of described channel.
Adopt technique scheme, the present invention at least has following advantages:
Outfield of the present invention channel data preprocess method and device, the signal component relative quantity that can receive at guarantee travelling carriage and base station is constant, the loss of signal avoiding Digital Simulation to cause channel data process, is conducive to realizing dynamic range flexible allocation in simulation process.The present invention by travelling carriage to all base station received signals, can the channel situation of undistorted process small-signal plus noise.The present invention passes through the different calibration target power of flexible configuration, and channel characteristics both can have been made consistent with actual decline, overall signal decline can be controlled at a zone of reasonableness again.
Accompanying drawing explanation
Fig. 1 is the channel data preprocess method flow chart of outfield described in the first embodiment;
Fig. 2 is channel data sequence schematic diagram in the first embodiment;
Fig. 3 is channel characteristics sequence diagram in the first embodiment;
Fig. 4 is the channel data preprocess method flow chart of outfield described in the second embodiment;
Fig. 5 is channel data sequence schematic diagram in the second embodiment;
Fig. 6 is channel characteristics sequence diagram in the second embodiment;
Fig. 7 is channel data sequence schematic diagram in the 3rd embodiment;
Fig. 8 is channel characteristics sequence diagram in the 4th embodiment;
Fig. 9 is the channel data pretreatment unit structural representation of outfield described in the 5th 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 be engaged in the radio network information channel Digital Simulation System of laboratory foundation to the process of channel data, avoid the loss of signal that the fixing bit wide processing mode of Digital Simulation System employing causes, invention broadly provides a kind of outfield channel data preprocess method and device, the channel data intensity collected from outfield is suitably strengthened, is conducive to realizing dynamic range flexible allocation.
First embodiment of the invention, be the situation of single footpath transmission for channel between base station and travelling carriage, the present embodiment introduces a kind of outfield channel data preprocess method, as shown in Figure 1, comprises following concrete steps:
Step S101, the channel collecting device in travelling carriage collects channel data sequence from outfield, this channel data sequence as shown in Figure 2, wherein comprise T0 moment ~ signal power of each base station that receives of Tn moment travelling carriage.Because synchronization only has a base station to be the serving BS of travelling carriage, point-to-point perfect condition is the useful signal that travelling carriage receives this serving BS and sends, but in practical application, the signal that other base stations send produces noise jamming to travelling carriage Received signal strength, and the noise power that travelling carriage receives is relative to very little available signal power.The travelling carriage calculated in subsequent step S103 of the present invention, to the Received signal strength gross power of all base stations, comprises noise power, therefore, it is possible to the channel situation of undistorted process small-signal plus noise.
Step S102, reads the signal power of arbitrary travelling carriage in each base station that synchronization receives from the channel data sequence that outfield collects.
Step S103, obtains the Received signal strength gross power of travelling carriage to all base stations to the signal power summation of each base station received.
Step S104, is divided by the target power of this Received signal strength gross power and setting, obtains the Dynamic gene in this moment.The range of choice of target power is: the maximum-10db of the actual transmit signal power of each base station arrives the maximum of the actual transmit signal power of each base station.Preferably, target power is the maximum of the actual transmit signal power of each base station, and now pretreated effect is signal power zero attenuation after transmission
Step S105, obtains the pad value of channel between each base station and travelling carriage by the signal power that each base station actual transmit signal power deducts the corresponding base station that travelling carriage receives.
Step S106, adjusts the pad value of channel between each base station and travelling carriage based on Dynamic gene, obtains the channel characteristics of channel between each base station and travelling carriage.Can form channel characteristics sequence by the above-mentioned channel characteristics in continuous moment, channel characteristics sequence as shown in Figure 3.
Second embodiment of the invention is the situation of Multipath Transmission for channel between base station and travelling carriage, and the present embodiment introduces a kind of outfield channel data preprocess method, as shown in Figure 4, comprises following concrete steps:
Step S201, the channel collecting device in travelling carriage collects channel data sequence from outfield, this channel data sequence as shown in Figure 5, wherein comprise T0 moment ~ signal power in Zhong Ge path, each base station that receives of Tn moment travelling carriage.
Step S202, reads the signal power of arbitrary travelling carriage in the Zhong Ge path, each base station that synchronization receives from the channel data sequence that outfield collects.
Step S203, obtains the Received signal strength gross power of travelling carriage to all base stations to the signal power summation in the Zhong Ge path, each base station received.
Step S204, is divided by the target power of this Received signal strength gross power and setting, obtains the Dynamic gene in this moment.The range of choice of target power is: the maximum-10db of the actual transmit signal power of each base station arrives the maximum of the actual transmit signal power of each base station.Preferably, target power is the maximum of the actual transmit signal power of each base station.
Step S205, obtains each path attenuation value of channel between each base station and travelling carriage by the signal power that each base station actual transmit signal power deducts each path of corresponding base station that travelling carriage receives.
Step S206, adjusts based on each path attenuation value of Dynamic gene to channel between each base station and travelling carriage, obtains the channel characteristics in each path of channel between each base station and travelling carriage.Can form channel characteristics sequence by the above-mentioned channel characteristics in continuous moment, channel characteristics sequence as shown in Figure 6.
Third embodiment of the invention, for the situation that channel between base station and travelling carriage is the transmission of single footpath, the present embodiment introduces a kind of outfield channel data preprocess method, roughly the same with the first embodiment, difference is: by the role exchange in the process of travelling carriage and base station, the signal power that channel collecting device in base station gathers each travelling carriage forms channel data sequence, and channel data sequence as shown in Figure 7.
Fourth embodiment of the invention, be the situation of Multipath Transmission for channel between base station and travelling carriage, the present embodiment introduces a kind of outfield channel data preprocess method, roughly the same with the second embodiment, difference is: by the role exchange in the process of travelling carriage and base station, the signal power that channel collecting device in base station gathers each path in each travelling carriage forms channel data sequence, and channel data sequence as shown in Figure 8.
Fifth embodiment of the invention, corresponding with the first embodiment, be the situation of single footpath transmission for channel between base station and travelling carriage, the present embodiment introduces a kind of outfield channel data pretreatment unit, as shown in Figure 9, comprises following part:
1) scaling unit, for being divided by the Received signal strength gross power of all base stations and the target power of setting at synchronization by arbitrary travelling carriage, obtains the Dynamic gene in described moment.Scaling unit specifically comprises:
Gross power calculating sub module, read the signal power of arbitrary travelling carriage in each base station that synchronization receives in the channel data sequence that collects from outfield, the Received signal strength gross power of travelling carriage to all base stations is obtained to the signal power summation of each base station received.
Dynamic gene calculating sub module, for being divided by the Received signal strength gross power of all base stations and the target power of setting by travelling carriage, obtains the Dynamic gene in described moment.The range of choice of target power is: the maximum-10db of the actual transmit signal power of each base station arrives the maximum of the actual transmit signal power of each base station.Preferably, target power is the maximum of the actual transmit signal power of each base station.
2) channel characteristics extraction unit, for according to Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of channel between each base station and travelling carriage.Channel characteristics extraction unit specifically comprises:
Pad value calculating sub module, is responsible for the pad value obtaining channel between each base station and travelling carriage by the signal power that each base station actual transmit signal power deducts the corresponding base station that travelling carriage receives;
Channel characteristics calculating sub module, for adjusting the pad value of channel between each base station and travelling carriage based on described Dynamic gene, obtains the channel characteristics of described channel.
Sixth embodiment of the invention, corresponding with the second embodiment, be the situation of Multipath Transmission for channel between base station and travelling carriage, the present embodiment introduces a kind of outfield channel data pretreatment unit, comprises following part:
1) scaling unit, for being divided by the Received signal strength gross power of all base stations and the target power of setting at synchronization by arbitrary travelling carriage, obtains the Dynamic gene in described moment.Scaling unit specifically comprises:
Gross power calculating sub module, read the signal power of arbitrary travelling carriage in the Zhong Ge path, each base station that synchronization receives in the channel data sequence that collects from outfield, the Received signal strength gross power of travelling carriage to all base stations is obtained to the signal power summation in the Zhong Ge path, each base station received.
Dynamic gene calculating sub module, for being divided by the Received signal strength gross power of all base stations and the target power of setting by travelling carriage, obtains the Dynamic gene in described moment.The range of choice of target power is: the maximum-10db of the actual transmit signal power of each base station arrives the maximum of the actual transmit signal power of each base station.Preferably, target power is the maximum of the actual transmit signal power of each base station.
2) channel characteristics extraction unit, for according to Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of channel between each base station and travelling carriage.Channel characteristics extraction unit specifically comprises:
Pad value calculating sub module, is responsible for each path attenuation value obtaining channel between each base station and travelling carriage by the signal power that each base station actual transmit signal power deducts each path of corresponding base station that travelling carriage receives;
Channel characteristics calculating sub module, for adjusting based on each path attenuation value of described Dynamic gene to channel between each base station and travelling carriage, obtains each path channel feature of described channel.
Seventh embodiment of the invention, for the situation that channel between base station and travelling carriage is the transmission of single footpath, the present embodiment introduces a kind of outfield channel data pretreatment unit, roughly the same with the 5th embodiment, difference is: by the role exchange in said device of travelling carriage and base station, this device specifically comprises:
1) scaling unit, for being divided by the Received signal strength gross power of all travelling carriages and the target power of setting at synchronization arbitrary base station, obtains the Dynamic gene in described moment.
2) channel characteristics extraction unit, for according to Dynamic gene and between each travelling carriage and base station the pad value of channel determine the channel characteristics of channel between each travelling carriage and base station.
Eighth embodiment of the invention, be the situation of Multipath Transmission for channel between base station and travelling carriage, the present embodiment introduces a kind of outfield channel data pretreatment unit, roughly the same with the 6th embodiment, difference is: by the role exchange in the process of travelling carriage and base station, this device specifically comprises:
1) scaling unit, for being divided by the Received signal strength gross power of all travelling carriages and the target power of setting at synchronization arbitrary base station, obtains the Dynamic gene in described moment.The Received signal strength gross power of all travelling carriages is by obtaining the received signal power summation in path each in all travelling carriages.
2) channel characteristics extraction unit, for according to Dynamic gene and between each travelling carriage and base station each path attenuation value of channel determine each path channel feature of channel between each travelling carriage and base station.
Ninth embodiment of the invention, descending interference channel during footpath transmission single for 3 base stations, describes in detail outfield channel data preprocessing process.
The actual transmit signal power of three base stations is all 46dbm.Travelling carriage is-54dbm ,-69dbm ,-90dbm at Ti reception to the signal power of three base stations respectively.Target power is 36dbm.Noise power is below-160dbm.
Step 1, gathers channel sequence file and reads Ti moment travelling carriage to the received signal power of all base stations from outfield, and the noise power of input.
Step 2, is added-54dbm ,-69dbm ,-90dbm that to obtain Received signal strength gross power be 4.006 × 10
6mw, i.e.-53.87dbm.
Step 3, is divided by Received signal strength gross power and target power, obtains the Dynamic gene R value in Ti moment for-89.87db.
Step 4, gather channel data sequence from outfield and read Ti moment travelling carriage to the received signal power of each base station and base station actual transmit signal power, deduct with base station actual transmit signal power the pad value that the received signal power of travelling carriage to each base station obtains each channel :-100db ,-115db ,-136db.
Step 5, the pad value of each channel and R value are subtracted each other, obtain the channel characteristics parameter in each channel T0 moment, be respectively :-10.13db ,-25.13db ,-49.13db, the channel characteristics sequence in the T0 moment between these channel characteristics parameter read-in travelling carriage and each base stations.
Step 6, continues other moment of process, until the Channel Processing in all moment is complete.
Outfield of the present invention channel data preprocess method and device, the signal component relative quantity that can receive at guarantee travelling carriage and base station is constant, the loss of signal avoiding Digital Simulation to cause channel data process, is conducive to realizing dynamic range flexible allocation in simulation process.The present invention by travelling carriage to all base station received signals, can the channel situation of undistorted process small-signal plus noise.The present invention passes through the different calibration target power of flexible configuration, and channel characteristics both can have been made consistent with actual decline, overall signal decline can be controlled at a zone of reasonableness again.
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. an outfield channel data preprocess method, is characterized in that, comprising:
Arbitrary travelling carriage is divided by the Received signal strength gross power of all base stations and the target power of setting at synchronization, obtains the Dynamic gene in described moment;
According to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel;
Described according to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel, specifically comprise:
The pad value of channel between each base station and travelling carriage is obtained by the signal power that each base station actual transmit signal power deducts the corresponding base station that travelling carriage receives;
Based on described Dynamic gene, the pad value of channel between each base station and travelling carriage is adjusted, obtain the channel characteristics of described channel.
2. outfield channel data preprocess method according to claim 1, is characterized in that, obtain described arbitrary travelling carriage as follows in the process of synchronization to the Received signal strength gross power of all base stations:
The signal power of arbitrary travelling carriage in each base station that synchronization receives is read from the channel data that outfield collects;
The Received signal strength gross power of travelling carriage to all base stations is obtained to the signal power summation of each base station received.
3. outfield channel data preprocess method according to claim 1, it is characterized in that, when channel exists multi-path transmission between each base station and travelling carriage, obtain described arbitrary travelling carriage as follows in the process of synchronization to the Received signal strength gross power of all base stations:
The signal power of arbitrary travelling carriage in the Zhong Ge path, each base station that synchronization receives is read from the channel data that outfield collects;
The Received signal strength gross power of travelling carriage to all base stations is obtained to the signal power summation in the Zhong Ge path, each base station received.
4. outfield channel data preprocess method according to claim 1 or 3, is characterized in that, described according to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel, specifically comprise:
Each path attenuation value of channel between each base station and travelling carriage is obtained by the signal power that each base station actual transmit signal power deducts each path of corresponding base station that travelling carriage receives;
Adjust based on each path attenuation value of described Dynamic gene to channel between each base station and travelling carriage, obtain each path channel feature of described channel.
5. outfield channel data preprocess method according to claim 1 or 2 or 3, is characterized in that, described target power is the maximum of the actual transmit signal power of each base station.
6. outfield channel data preprocess method according to claim 1 or 2 or 3, it is characterized in that, the range of choice of described target power is: the maximum-10db of the actual transmit signal power of each base station arrives the maximum of the actual transmit signal power of each base station.
7. an outfield channel data preprocess method, is characterized in that, comprising: be divided by the Received signal strength gross power of all travelling carriages and the target power of setting at synchronization arbitrary base station, obtain the Dynamic gene in described moment;
The channel characteristics of described channel is determined according to the pad value of channel between described Dynamic gene and each travelling carriage to base station;
Described according to described Dynamic gene and between each travelling carriage and base station the pad value of channel determine the channel characteristics of described channel, specifically comprise:
The pad value of channel between each travelling carriage and base station is obtained by the signal power that each travelling carriage actual transmit signal power deducts the corresponding travelling carriage that base station receives;
Based on described Dynamic gene, the pad value of channel between each travelling carriage and base station is adjusted, obtain the channel characteristics of described channel.
8. an outfield channel data pretreatment unit, is characterized in that, comprising:
Scaling unit, for being divided by the Received signal strength gross power of all base stations and the target power of setting at synchronization by arbitrary travelling carriage, obtains the Dynamic gene in described moment;
Channel characteristics extraction unit, for according to described Dynamic gene and between each base station and travelling carriage the pad value of channel determine the channel characteristics of described channel;
Described channel characteristics extraction unit, the signal power specifically for deducting the corresponding base station that travelling carriage receives with each base station actual transmit signal power obtains the pad value of channel between each base station and travelling carriage;
Based on described Dynamic gene, the pad value of channel between each base station and travelling carriage is adjusted, obtain the channel characteristics of described channel.
9. an outfield channel data pretreatment unit, is characterized in that, comprising:
Scaling unit, for being divided by the Received signal strength gross power of all travelling carriages and the target power of setting at synchronization arbitrary base station, obtains the Dynamic gene in described moment;
Channel characteristics extraction unit, for according to Dynamic gene and between each travelling carriage and base station the pad value of channel determine the channel characteristics of described channel;
Described channel characteristics extraction unit, the signal power specifically for deducting with each travelling carriage actual transmit signal power the corresponding travelling carriage that base station receives obtains the pad value of channel between each travelling carriage and base station;
Based on described Dynamic gene, the pad value of channel between each travelling carriage and base station is adjusted, obtain the channel characteristics of described channel.
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| PCT/CN2011/078527 WO2012155402A1 (en) | 2011-05-19 | 2011-08-17 | Method and device for preprocessing field channel data |
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|---|---|---|---|---|
| CN101150338A (en) * | 2006-09-20 | 2008-03-26 | 中兴通讯股份有限公司 | An estimating method for service capacity loss |
| WO2010094000A2 (en) * | 2009-02-13 | 2010-08-19 | Spirent Communications, Inc. | Emulation and controlled testing of mimo ota channels |
| CN101924594A (en) * | 2010-09-16 | 2010-12-22 | 华中科技大学 | Method for judging radio testing environment under the condition of external field |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150338A (en) * | 2006-09-20 | 2008-03-26 | 中兴通讯股份有限公司 | An estimating method for service capacity loss |
| WO2010094000A2 (en) * | 2009-02-13 | 2010-08-19 | Spirent Communications, Inc. | Emulation and controlled testing of mimo ota channels |
| CN101924594A (en) * | 2010-09-16 | 2010-12-22 | 华中科技大学 | Method for judging radio testing environment under the condition of external field |
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