CN102448096A - Method and device for constructing wireless external filed high-speed simulation environment - Google Patents

Abstract

The invention discloses a method and device for constructing a wireless external filed high-speed simulation environment. The method comprises the following steps of: determining a wireless signal superposition factor according to a wireless channel parameter, the actual motion speed of a tested terminal and the expected motion speed higher than the actual motion speed, wherein the wireless signal superposition factor is used for expressing the frequency swing of the expected motion speed to the wireless signal; superposing the wireless signal superposition factor to a downlink radio frequency signal of a base station; and transmitting the downlink radio frequency signal to the tested terminal. By using the method and device disclosed by the invention, the effect of simulated high-speed moving wireless external field environment under the low-speed wireless external field condition can be achieved.

Description

A kind of structure wireless outfield high-speed simulation environment method and device

Technical field

The present invention relates to communication technical field, particularly relate to a kind of structure wireless outfield high-speed simulation environment method and device.

Background technology

In wireless field testing, can use speech or data service through the testing mobile phone analog subscriber, meanwhile, receiver is as independently disturb the signal strength signal intensity and the inside and outside of testing equipment test wireless environment.In test process; Test macro is noted the information such as information, network parameter setting, signaling message, data throughout and signal strength signal intensity of mobile phone state, service/neighbor cell; Through the fault data that runs in the analytical test, find out the existing problem of network side or end side.

Carry out under high velocity environment through regular meeting in the wireless field testing, the communication that the communication under the high-speed moving state is compared under inactive state or the lower-speed state faces more problem, comprises Doppler effect and switches the influence that brings fast.When communicating by letter under the situation of terminal in high-speed mobile; The signal frequency of receiving terminal can change; This phenomenon is called Doppler effect; The frequency displacement that is caused by Doppler effect is called Doppler frequency shift, and during multipath transmisstion in considering practical radio communication environment, Doppler frequency shift will change Doppler's expansion into.Doppler expansion all exerts an influence to base station and terminal, if do not take measures, communication quality is severe exacerbation, even causes going offline.

The influence that the base station is caused for high velocity environment; GSM (Global System for MobileCommunications; Global system for mobile communications)/TDS (Time Division-Synchronous; Time-division is synchronous)/TD-LTE (Time Division-Long Term Evolution, time-division Long Term Evolution) base station can carry out frequency deviation correction through channel estimation method, with 2 times even 3 frequencys multiplication partially (500KM/h) be corrected in the normal demodulation scope; Therefore, the base station is not the major technique bottleneck under the high velocity environment.Can the stress test object under the high velocity environment be the terminal, need the frequency-tracking ability of emphasis verification terminal satisfy the requirement of the inclined to one side scope of 1 frequency multiplication.

In the prior art scheme, under the true high velocity environment in wireless outfield, the terminal is tested usually.The construction method of the true high velocity environment in wireless outfield can for: lay the base station along the line at highway or railway; The tester (for example takes the corresponding vehicles; Automobile, high ferro train and magnetic suspension train etc.); When the vehicles passed through base station coverage area at a relatively high speed, the tester carried out wireless dependence test in the vehicles.

In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:

Because vehicles restriction; When under high velocity environment, carrying out wireless field testing; Can't be according to test factors such as test request control rate and motion modes, speed is comparatively fixing during through FX, movement velocity that only can monitoring terminal; Can't satisfy the demand of wireless field testing easily to velocity variations; Often need carry out test back and forth at different circuits, cause test period long, difficulty of test is bigger, even can't accomplish because of the high speed test environment that can't make up expection causes testing.

Summary of the invention

The object of the present invention is to provide a kind of structure wireless outfield high-speed simulation environment method and device, so that the wireless external field environment that simulating high-speed moves under the low-speed wireless condition of external field, for this reason, the present invention adopts following technical scheme:

The embodiment of the invention provides the wireless outfield high-speed simulation of a kind of structure environment method, comprising:

According to the actual motion speed of wireless channel parameter, dut terminal be higher than the desired movement speed of said actual motion speed; Confirm the wireless signal stack factor, the said wireless signal stack factor is used to represent the frequency deviation of said desired movement speed to the wireless signal generation;

The said wireless signal stack factor is added on the downlink radio-frequency signal of base station, said downlink radio-frequency signal is sent to said dut terminal.

The embodiment of the invention also provides a kind of base station, comprising:

Baseband processing unit is used to generate digital baseband signal;

The high-speed simulation unit; Be used for confirming the wireless signal stack factor according to the actual motion speed of wireless channel parameter, dut terminal and the desired movement speed that is higher than said actual motion speed; And the said wireless signal stack factor that on said digital baseband signal, superposes, the said wireless signal stack factor is used to represent the frequency deviation of said desired movement speed to the wireless signal generation;

Remote Radio Unit is used for converting the digital baseband signal after the said wireless signal stack of the stack factor into downlink radio-frequency signal;

Antenna-feedback system is used for said downlink radio-frequency signal is sent to dut terminal.

The embodiment of the invention also provides a kind of simulator, comprising:

Controller; Be used for according to the actual motion speed of wireless channel parameter, dut terminal and be higher than the desired movement speed of said actual motion speed; Confirm the wireless signal stack factor, the said wireless signal stack factor is used to represent the frequency deviation of said desired movement speed to the wireless signal generation;

Low-converter is used to receive the downlink radio-frequency signal of base station, converts said downlink radio-frequency signal into intermediate-freuqncy signal;

Analog to digital converter is used to receive the intermediate-freuqncy signal from said low-converter, converts said intermediate-freuqncy signal into baseband signal;

Multiplier is used to receive from the wireless signal stack factor of said controller with from the baseband signal of said analog to digital converter, the said wireless signal stack of the stack factor on said baseband signal;

Digital to analog converter has been used to receive from the stack of said multiplier the baseband signal of the said wireless signal stack factor, converts said baseband signal into intermediate-freuqncy signal;

Upconverter is used to receive the intermediate-freuqncy signal from digital to analog converter, converts said intermediate-freuqncy signal into downlink radio-frequency signal.

Compared with prior art; The embodiment of the invention has the following advantages: because will be added to downlink radio-frequency signal with the wireless signal stack factor of simulation velocity parameter correlation; Reached the effect of the wireless external field environment that simulating high-speed moves under the low-speed wireless condition of external field; Reduced the site requirements of wireless outfield high speed test environment, made wireless outfield not limited by traffic at a high speed, the influence of having avoided traffic factor that the high speed field testing is caused.

Description of drawings

Fig. 1 is the wireless outfield high-speed simulation of the structure in an embodiment of the invention environment method flow chart;

Fig. 2 is the structural representation of the base station in the embodiment of the invention;

Fig. 3 is the structural representation of the simulator in the embodiment of the invention.

Embodiment

For addressing the deficiencies of the prior art; The embodiment of the invention proposes the wireless outfield high-speed simulation of a kind of structure environment method; The wireless external field environment that simulating high-speed moves under the low-speed wireless condition of external field is to reach the effect through the wireless external field environment of low speed mobile wireless external field environment simulation high-speed mobile.

In wireless field testing; The high-speed mobile emulation wireless signal that the high-speed simulation device that is used for the simulating high-speed environment that travelling carriage will receive to be provided by the embodiment of the invention is produced; This emulation wireless signal can move factors such as caused wireless signal Doppler frequency shift, Doppler's expansion, quick decline by simulating high-speed; Lack the problem of high speed field testing scene owing to condition of external field is limited to solve, thereby satisfy under the high-speed mobile situation testing requirement terminal capabilities, quality of service and the network optimization.

In the embodiment of the invention, can in each base station in the wireless outfield high-speed simulation environment, increase the high-speed simulation device, control centre is to the desired movement speed of high-speed simulation device output dut terminal, the high-speed simulation state of the wireless external field environment of real time altering.The high-speed simulation device is according to the actual motion speed of wireless channel parameter, dut terminal and be higher than the desired movement speed of this actual motion speed; Confirm the wireless signal stack factor, this wireless signal stack factor is used to represent the frequency deviation of desired movement speed to the wireless signal generation; The wireless signal factor that superposes is added on the downlink radio-frequency signal of base station, downlink radio-frequency signal is sent to dut terminal.Dut terminal carries out frequency deviation correction when receiving this downlink radio-frequency signal handles, and can obtain the test result of simulation high speed scene under low speed environments according to the correction result of dut terminal.

To combine the accompanying drawing among the present invention below, the technical scheme among the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the present invention protects.

As shown in Figure 1, be the wireless outfield high-speed simulation of the structure in embodiment of the invention environment method flow chart.Wherein, be provided with the high-speed simulation device in base station side, this high-speed simulation device is between base station RRU (RadioRemote Unit, radio frequency remoto module) and the antenna-feedback system, and is connected with control centre.Based on this framework, the flow process that makes up wireless outfield high-speed simulation environment may further comprise the steps:

Step 101, the high-speed simulation device receives from the wireless channel parameter of control centre, the actual motion speed and the desired movement speed of dut terminal.

Particularly, control centre can be positioned at network side, can obtain the actual motion speed and the desired movement speed of dut terminal, and the actual motion speed and the desired movement speed of dut terminal is sent to the high-speed simulation device.Control centre can the real-time update dut terminal desired movement speed, with the high-speed simulation environment of the wireless external field environment of real time altering.The wireless channel parameter that control centre sent can comprise under the actual low speed environments and the time delay and the arrival direction angle of simulating the multipath channel under the high velocity environment.

Step 102, the high-speed simulation device is confirmed the wireless signal stack factor according to the actual motion speed and the desired movement speed of wireless channel parameter, dut terminal.

Particularly, the high-speed simulation device can calculate the wireless signal stack factor according to from the wireless channel parameter of control centre, actual motion speed and the desired movement speed and the preset simulation algorithm of dut terminal.Wherein, the wireless signal stack factor is used to represent that desired movement speed to the frequency deviation that wireless signal produces, is the desired movement function of speed of dut terminal, can comprise the amplitude stack factor, the phase place stack factor and the frequency stack factor of wireless signal.

Step 103, the high-speed simulation device is transformed into digital baseband signal with the downlink radio-frequency signal that the base station sends to dut terminal, on this digital baseband signal, is superimposed with the wireless signal stack factor that calculates in the step.

Particularly; The high-speed simulation device can access base station RRU RF output end; Receive downlink radio-frequency signal; Through down-conversion and analog-to-digital conversion downlink radio-frequency signal is transformed into digital baseband signal, will be added to through the wireless signal stack factor that step 102 calculates on the digital baseband signal, digital baseband signal is carried out weighted.This weighted has changed amplitude, frequency and the phase place of the reception signal of the dut terminal under the actual low speed environments, makes its reception signal near the dut terminal under the simulation high velocity environment.

Step 104, the high-speed simulation device is transformed into downlink radio-frequency signal with digital baseband signal, and this downlink radio-frequency signal is sent to the antenna-feedback system of base station, and antenna-feedback system sends to dut terminal with the downlink radio-frequency signal that receives.

Particularly, the high-speed simulation device can become downlink radio-frequency signal through digital-to-analogue conversion with frequency down-converts with the digital baseband signal after the stack wireless signal stack factor.The high-speed simulation device is connected with the antenna-feedback system of base station, can above-mentioned downlink radio-frequency signal be sent to dut terminal through the antenna-feedback system of base station.

The principle and the derivation of the simulation algorithm in the embodiment of the invention are described below:

The wireless signal stack factor in the embodiment of the invention can be represented through following form:

$a\left(t\right)=\frac{r^{\′}\left(t\right)}{r\left(t\right)}---\left[1\right]$

Wherein, a (t) is the wireless signal stack factor, and r ' (t) is the reception signal of the dut terminal under the simulation high velocity environment, and r (t) is the reception signal of the dut terminal under the actual low speed environments.

The reception signal r (t) of the dut terminal under the actual low speed environments is:

$r\left(t\right)=\underset{i}{\mathrm{\Σ}}f(s\left(t\right),{\mathrm{\τ}}_i,{\mathrm{\θ}}_i,f_m,f_c)---\left[2\right]$

Wherein, f (x) is the product of complex-exponential function, the downstream signal that s (t) sends for the base station, τ _iBe the time delay of the multipath channel under the actual low speed environments, θ _iBe the arrival direction angle of the multipath channel under the actual low speed environments, i representes i bar multipath, f _mBe the maximum doppler frequency under the actual low speed environments, f _cThe frequency of the downstream signal that sends for the base station.

The reception signal r ' of the dut terminal under the simulation high velocity environment (t) is:

Wherein, f (x) is the product of complex-exponential function, the downstream signal that s (t) sends for the base station, τ ' _iBe the time delay of the multipath channel under the simulation high velocity environment, θ ' _iBe the arrival direction angle of the multipath channel under the simulation high velocity environment, i representes i bar multipath, f ' _mBe the maximum doppler frequency under the simulation high velocity environment, f _cThe frequency of the downstream signal that sends for the base station.

Under the actual low speed environments and the time delay of the multipath channel of simulation under the high velocity environment and arrival direction angle can be carried out drive test by drive test instruments such as test terminal, scanner and drive test softwares and obtained, and also can obtain with reference to known channel model.

Under the actual low speed environments and the maximum doppler frequency of simulation under the high velocity environment be respectively:

$f_m=\frac{v}{\mathrm{\λ}}---\left[4\right]$

$f_m^{\′}=\frac{v^{\′}}{\mathrm{\λ}}---\left[5\right]$

Wherein, λ is a signal wavelength, and v is the actual motion speed of dut terminal, and v ' is the analog rate of dut terminal.

The propagation path of assumed wireless signal does not change, and can a (t) be write as following form:

a(t)＝bexp(-jφ)δ(τ)......................[6]

Wherein, b, φ are amplitude and the phase place of a (t) self.

The basis signal communication theory, the reception signal of the dut terminal under the actual low speed environments is:

$r\left(t\right)=\underset{i}{\mathrm{\&Sigma;}}{a}_i\&CenterDot;s^{\&prime;}(t-{\mathrm{\&tau;}}_i)\&CenterDot;\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_m\mathrm{\&Delta;}t\cos {\mathrm{\&theta;}}_i)\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_c{\mathrm{\&tau;}}_i)$

$=\underset{i}{\mathrm{\&Sigma;}}{a}_i\&CenterDot;\mathrm{bs}(t-{\mathrm{\&tau;}}_i)\exp (-\mathrm{j\&phi;})\&CenterDot;\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_m\mathrm{\&Delta;}t\cos {\mathrm{\&theta;}}_i)\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_c{\mathrm{\&tau;}}_i)$

..............[7]

If make r (t) can reach the form that target receives signal, promptly

$r^{\&prime;}\left(t\right)=\underset{i}{\mathrm{\&Sigma;}}{a}_{i}s(t-{\mathrm{\&tau;}}_i)\&CenterDot;\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_m^{\&prime;}\mathrm{\&Delta;}t\cos {\mathrm{\&theta;}}_i)\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_c{\mathrm{\&tau;}}_i)---\left[8\right]$

Then a (t) can be expressed as:

$a\left(t\right)=\mathrm{bexp}(-\mathrm{j\&phi;})=\frac{\underset{i}{\mathrm{\&Sigma;}}{M}_i\left(t\right)\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_m\mathrm{\&Delta;}t\cos {\mathrm{\&theta;}}_i)\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;\&Delta;}{f}_m\mathrm{\&Delta;}t\cos {\mathrm{\&theta;}}_i)}{\underset{i}{\mathrm{\&Sigma;}}{M}_i\left(t\right)\exp (-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000294820600022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_m\mathrm{\&Delta;}t\cos {\mathrm{\&theta;}}_i)}$

..............[9]

Wherein, Δ f _mBe f _mAnd f ' _mPoor.

Can find out wireless signal stack factor a (t) and terminal actual motion speed, desired movement speed and wireless channel parameter correlation according to above derivation.

Need to prove; In the process of carrying out wireless field testing; Control centre can be connected with a plurality of high-speed simulation devices in the zones of different; The desired movement speed of the dut terminal that high-speed simulation device output that can be in zones of different is different accelerates to motion process at a high speed with emulation terminal by low speed.In addition, control centre can also dynamically adjust the desired movement speed to the dut terminal of same high-speed simulation device output according to testing requirement, to realize the multi-rate simulating under the same environment.

High-speed simulation device in the embodiment of the invention adopts bypass to handle to up radiofrequency signal, does not carry out other Digital Signal Processing.The high-speed simulation device can be arranged in base station equipment, as the part of base station equipment, also can be independent of base station equipment.

Step 101 in the embodiment of the invention is a preferred steps, the high-speed simulation device can through with the actual motion speed of obtaining wireless channel parameter, dut terminal being connected of control centre and desired movement speed.In other execution modes of the present invention; Also execution in step 101 not; Be that the high-speed simulation device does not receive the wireless channel parameter from control centre, the actual motion speed and the desired movement speed of dut terminal; But obtain the actual motion speed and the desired movement speed of wireless channel parameter, dut terminal through other mode; For example, obtain the wireless channel parameter of user's input, the actual motion speed and the desired movement speed of dut terminal, this mode also can reach the purpose that makes up wireless outfield high-speed simulation environment to a certain extent.

In other execution modes of the present invention, also can the high-speed simulation device be integrated in inside of base station, thereby make up wireless outfield high-speed simulation environment.Particularly, can the high-speed simulation unit be set at inside of base station, this unit can or be integrated in the baseband processing unit between baseband processing unit and RF processing unit.The base station can be after receiving high-speed simulation test instruction that dut terminal or control centre send and relevant parameter; Confirm the wireless signal stack factor by the high-speed simulation unit according to this instruction and relevant parameter; And it is superimposed upon on the digital baseband signal, this digital baseband signal that has superposeed the wireless signal stack factor is sent to the Remote Radio Unit of base station; The digital baseband signal that Remote Radio Unit will superpose after the wireless signal stack factor is transformed into the antenna-feedback system that downlink radio-frequency signal sends to the base station; The antenna-feedback system of base station sends to dut terminal with downlink radio-frequency signal.Wherein, the mode of confirming the wireless signal stack factor can repeat no more at this like previous embodiment.This execution mode also can reach the purpose that makes up wireless outfield high-speed simulation environment to a certain extent.

Embodiments of the invention comprise following advantage; Because adopt the high-speed simulation device downlink radio-frequency signal that will be added to the wireless signal stack factor of the desired movement velocity correlation of dut terminal; Reached the effect of the wireless external field environment that simulating high-speed moves under the low-speed wireless condition of external field; Reduced the site requirements of wireless outfield high speed test environment, made wireless outfield not limited by traffic at a high speed, the influence of having avoided traffic factor that the high speed field testing is caused.Further; Through the real-time control of control centre to the desired movement speed of dut terminal; Can satisfy the wireless field testing demand of multiple friction speed, and can be according to testing requirement real-time change high-speed simulation speed, with multiple speed under variable motion under the simulating high-speed situation and the same environment and the situation of depositing; Satisfy the demand of wireless field testing, realize multi-speed wireless field testing environment velocity variations.In addition, all can carry out in same environmental area with the relevant wireless field testing of high speed, and the control precision of high-speed simulation is higher, and is better repeatable.Certainly, arbitrary product of the embodiment of embodiment of the present invention might not reach above-described all advantages simultaneously.

According to the wireless outfield high-speed simulation of the structure that provides in above-mentioned execution mode environment method, the embodiment of the invention also provides the device of using the wireless outfield high-speed simulation of above-mentioned structure environment method.

As shown in Figure 2, the structural representation for the base station in the embodiment of the invention comprises:

Baseband processing unit 210 is used to generate digital baseband signal.

High-speed simulation unit 220 is used for confirming the wireless signal stack factor according to the actual motion speed of wireless channel parameter, dut terminal and the desired movement speed that is higher than this actual motion speed, and on digital baseband signal this wireless signal stack factor of stack.

Wherein, the wireless signal stack factor is used to represent that desired movement speed to the frequency deviation that wireless signal produces, can be the desired movement function of speed of dut terminal, can comprise the amplitude stack factor, the phase place stack factor and the frequency stack factor of wireless signal.

Particularly, above-mentioned high-speed simulation unit 220 specifically is used for confirming under the actual low speed environments respectively and the maximum doppler frequency under the simulation high velocity environment according to the actual motion speed and the desired movement speed of dut terminal; According to the downstream signal of base station transmission, the maximum doppler frequency under the simulation high velocity environment, the time delay of multipath channel and the reception signal that the dut terminal under the simulation high velocity environment is confirmed at the arrival direction angle, according to downstream signal, the maximum doppler frequency under the actual low speed environments, the time delay of multipath channel and the reception signal that the dut terminal under the actual low speed environments is confirmed at the arrival direction angle of base station transmission; With the ratio between the reception signal of the reception signal of simulation high velocity environment dut terminal down and the dut terminal under the actual low speed environments as the said wireless signal factor that superposes.

Remote Radio Unit 230 is used for converting the digital baseband signal after the stack wireless signal stack factor into downlink radio-frequency signal.

Antenna-feedback system 240 is used for downlink radio-frequency signal is sent to dut terminal.

Above-mentioned execution mode provides a kind of base station that comprises the high-speed simulation unit, to make up wireless outfield high-speed simulation environment; In other execution modes of the present invention, simulator can also be set outside the base station, can realize making up the purpose of wireless outfield high-speed simulation environment through this simulator equally.

As shown in Figure 3, the structural representation for the simulator in the embodiment of the invention comprises:

Controller 310 is used for according to the actual motion speed of wireless channel parameter, dut terminal and is higher than this actual motion speed desired movement speed, confirms the wireless signal stack factor.

Wherein, the wireless signal stack factor is used to represent the frequency deviation of desired movement speed to the wireless signal generation.Particularly, above-mentioned controller 310 can be confirmed under the actual low speed environments respectively and the maximum doppler frequency under the simulation high velocity environment according to the actual motion speed and the desired movement speed of dut terminal; According to the downstream signal of base station transmission, the maximum doppler frequency under the simulation high velocity environment, the time delay of multipath channel and the reception signal that the dut terminal under the simulation high velocity environment is confirmed at the arrival direction angle, according to downstream signal, the maximum doppler frequency under the actual low speed environments, the time delay of multipath channel and the reception signal that the dut terminal under the actual low speed environments is confirmed at the arrival direction angle of base station transmission; With the ratio between the reception signal of the reception signal of simulation high velocity environment dut terminal down and the dut terminal under the actual low speed environments as the said wireless signal factor that superposes.

Low-converter 320 is used to receive the downlink radio-frequency signal from the base station, converts this downlink radio-frequency signal into intermediate-freuqncy signal.

Analog to digital converter (A/D) 330 is used to receive the intermediate-freuqncy signal from low-converter 320, converts this intermediate-freuqncy signal into baseband signal.

Multiplier 340 is used to receive the wireless signal stack factor of self-controller 310 and from the baseband signal of analog to digital converter 330, the stack wireless signal stack factor on baseband signal.

Digital to analog converter (D/A) 350 has been used to receive from the stack of multiplier 340 baseband signal of the wireless signal stack factor, converts this baseband signal into intermediate-freuqncy signal.

Upconverter 360 is used to receive the intermediate-freuqncy signal from digital to analog converter 350, converts this intermediate-freuqncy signal into downlink radio-frequency signal.

Wherein, upconverter 360 can be connected to same LO (Local Oscillator, local oscillator) with low-converter 320.

Variable attenuator 370 is used to receive the downlink radio-frequency signal from upconverter 360, and this downlink radio-frequency signal is decayed.

Embodiments of the invention comprise following advantage; Because will be added to downlink radio-frequency signal with the wireless signal stack factor of the desired movement velocity correlation of dut terminal; Reached the effect of the wireless external field environment that simulating high-speed moves under the low-speed wireless condition of external field; Reduced the site requirements of wireless outfield high speed test environment, made wireless outfield not limited by traffic at a high speed, the influence of having avoided traffic factor that the high speed field testing is caused.Further; Through the real-time control of control centre to the desired movement speed of dut terminal; Can satisfy the wireless field testing demand of multiple friction speed, and can be according to testing requirement real-time change high-speed simulation speed, with multiple speed under variable motion under the simulating high-speed situation and the same environment and the situation of depositing; Satisfy the demand of wireless field testing, realize multi-speed wireless field testing environment velocity variations.In addition, all can carry out in same environmental area with the relevant wireless field testing of high speed, and the control precision of high-speed simulation is higher, and is better repeatable.Certainly, arbitrary product of the embodiment of embodiment of the present invention might not reach above-described all advantages simultaneously.

It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.

Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.

The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be looked protection scope of the present invention.

Claims (10)

1. one kind makes up wireless outfield high-speed simulation environment method, it is characterized in that, comprising:

Confirm the wireless signal stack factor according to the actual motion speed of wireless channel parameter, dut terminal and the desired movement speed that is higher than said actual motion speed, the said wireless signal stack factor is used to the frequency deviation of representing that said desired movement speed produces wireless signal;

The said wireless signal stack factor is added on the downlink radio-frequency signal of base station, said downlink radio-frequency signal is sent to said dut terminal.

2. the method for claim 1; It is characterized in that; Said base station is connected with the high-speed simulation device, and said high-speed simulation device is confirmed the wireless signal stack factor according to the actual motion speed of wireless channel parameter, dut terminal and the desired movement speed that is higher than said actual motion speed;

Said wireless signal the be added to downlink radio-frequency signal of base station of the factor that superposes is sent to said dut terminal with said downlink radio-frequency signal, comprising:

Said high-speed simulation device receives the downlink radio-frequency signal that send the base station; Said downlink radio-frequency signal is transformed into digital baseband signal; The said wireless signal of the stack stack factor on said digital baseband signal, and superpose digital baseband signal after the factor of the said wireless signal that will superpose is transformed into downlink radio-frequency signal and sends to the antenna-feedback system in the said base station;

Downlink radio-frequency signal after antenna-feedback system in the said base station is handled said high-speed simulation device sends to said dut terminal.

3. the method for claim 1; It is characterized in that; Said base station is provided with the high-speed simulation unit, and the wireless signal stack factor is confirmed according to the actual motion speed of wireless channel parameter, dut terminal and the desired movement speed that is higher than said actual motion speed in said high-speed simulation unit;

Said wireless signal the be added to downlink radio-frequency signal of base station of the factor that superposes is sent to said dut terminal with said downlink radio-frequency signal, comprising:

The said high-speed simulation unit said wireless signal stack factor that on digital baseband signal, superposes, the digital baseband signal after the said wireless signal stack factor that superposes convert through the Remote Radio Unit of said base station that the antenna-feedback system through said base station sends to said dut terminal behind the downlink radio-frequency signal into.

4. like each described method of claim 1 to 3, it is characterized in that said wireless channel parameter comprises under the actual low speed environments and the time delay and the arrival direction angle of simulating the multipath channel under the high velocity environment;

Said according to wireless channel parameter, dut terminal actual motion speed and be higher than the desired movement speed of said actual motion speed, confirm the wireless signal stack factor, comprising:

Actual motion speed and desired movement speed according to dut terminal are confirmed under the actual low speed environments respectively and the maximum doppler frequency under the simulation high velocity environment;

According to the downstream signal of base station transmission, the maximum doppler frequency under the simulation high velocity environment, the time delay of multipath channel and the reception signal that the dut terminal under the simulation high velocity environment is confirmed at the arrival direction angle, according to downstream signal, the maximum doppler frequency under the actual low speed environments, the time delay of multipath channel and the reception signal that the dut terminal under the actual low speed environments is confirmed at the arrival direction angle of base station transmission;

With the ratio between the reception signal of the reception signal of simulation high velocity environment dut terminal down and the dut terminal under the actual low speed environments as the said wireless signal factor that superposes.

5. like each described method of claim 1 to 3, it is characterized in that the said wireless signal stack factor comprises the amplitude stack factor, the phase place stack factor and the frequency stack factor of wireless signal.

6. a base station is characterized in that, comprising:

Baseband processing unit is used to generate digital baseband signal;

The high-speed simulation unit; Be used for confirming the wireless signal stack factor according to the actual motion speed of wireless channel parameter, dut terminal and the desired movement speed that is higher than said actual motion speed; And the said wireless signal stack factor that on said digital baseband signal, superposes, the said wireless signal stack factor is used to represent the frequency deviation of said desired movement speed to the wireless signal generation;

Remote Radio Unit is used for converting the digital baseband signal after the said wireless signal stack of the stack factor into downlink radio-frequency signal;

Antenna-feedback system is used for said downlink radio-frequency signal is sent to dut terminal.

7. base station as claimed in claim 6 is characterized in that,

Said high-speed simulation unit specifically is used for confirming under the actual low speed environments respectively and the maximum doppler frequency under the simulation high velocity environment according to the actual motion speed and the desired movement speed of dut terminal; According to the downstream signal of base station transmission, the maximum doppler frequency under the simulation high velocity environment, the time delay of multipath channel and the reception signal that the dut terminal under the simulation high velocity environment is confirmed at the arrival direction angle, according to downstream signal, the maximum doppler frequency under the actual low speed environments, the time delay of multipath channel and the reception signal that the dut terminal under the actual low speed environments is confirmed at the arrival direction angle of base station transmission; With the ratio between the reception signal of the reception signal of simulation high velocity environment dut terminal down and the dut terminal under the actual low speed environments as the said wireless signal factor that superposes.

8. a simulator is characterized in that, comprising:

Controller; Be used for according to the actual motion speed of wireless channel parameter, dut terminal and be higher than the desired movement speed of said actual motion speed; Confirm the wireless signal stack factor, the said wireless signal stack factor is used to represent the frequency deviation of said desired movement speed to the wireless signal generation;

Low-converter is used to receive the downlink radio-frequency signal of base station, converts said downlink radio-frequency signal into intermediate-freuqncy signal;

Analog to digital converter is used to receive the intermediate-freuqncy signal from said low-converter, converts said intermediate-freuqncy signal into baseband signal;

Multiplier is used to receive from the wireless signal stack factor of said controller with from the baseband signal of said analog to digital converter, the said wireless signal stack of the stack factor on said baseband signal;

Digital to analog converter has been used to receive from the stack of said multiplier the baseband signal of the said wireless signal stack factor, converts said baseband signal into intermediate-freuqncy signal;

Upconverter is used to receive the intermediate-freuqncy signal from digital to analog converter, converts said intermediate-freuqncy signal into downlink radio-frequency signal.

9. simulator as claimed in claim 8 is characterized in that,

Said controller specifically is used for confirming under the actual low speed environments respectively and the maximum doppler frequency under the simulation high velocity environment according to the actual motion speed and the desired movement speed of dut terminal; According to the downstream signal of base station transmission, the maximum doppler frequency under the simulation high velocity environment, the time delay of multipath channel and the reception signal that the dut terminal under the simulation high velocity environment is confirmed at the arrival direction angle, according to downstream signal, the maximum doppler frequency under the actual low speed environments, the time delay of multipath channel and the reception signal that the dut terminal under the actual low speed environments is confirmed at the arrival direction angle of base station transmission; With the ratio between the reception signal of the reception signal of simulation high velocity environment dut terminal down and the dut terminal under the actual low speed environments as the said wireless signal factor that superposes.

10. like claim 8 or 9 described simulators, it is characterized in that, also comprise:

Variable attenuator is used to receive the downlink radio-frequency signal from said upconverter, and said downlink radio-frequency signal is decayed.

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