CN109039508A - Wireless multipath fading channel simulator system and method - Google Patents
Wireless multipath fading channel simulator system and method Download PDFInfo
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- CN109039508A CN109039508A CN201811162628.6A CN201811162628A CN109039508A CN 109039508 A CN109039508 A CN 109039508A CN 201811162628 A CN201811162628 A CN 201811162628A CN 109039508 A CN109039508 A CN 109039508A
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- H—ELECTRICITY
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- 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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Abstract
The present embodiments relate to emulation testing technical fields, disclose a kind of wireless multipath fading channel simulator system and method.The system includes: host computer, converter unit and baseband processing unit；Host computer includes: user control unit and channel coefficients generation unit；User control unit is used to calculate the shock response coefficient of channel fading model according to channel model parameters for channel model parameters, channel coefficients generation unit to be arranged；Converter unit is used to for RF test signal being converted into the signal of default frequency range, and is transmitted to baseband processing unit；Baseband processing unit is used to carry out multipath delay processing to the signal of default frequency range, and the baseband signal of decline is calculated according to the signal of shock response coefficient and the default frequency range handled through multipath delay.Using embodiment of the present invention can the performance for wireless communications to equipment tested comprehensively, convenient test and at low cost.
Description
Technical field
The present embodiments relate to emulation testing technical field, in particular to a kind of wireless multipath fading channel simulator system
And method.
Background technique
The highly maneuvering targets such as train or cloud rail are expert at into the process, carry out information by wireless electromagnetic environment and ground platform
With the interaction of data.The complicated multiplicity of the wireless electromagnetic environmental factor of signal in train-ground communication link, to train-ground communication link device
Test job propose great challenge.For example, fast moving due to the highly maneuvering targets such as train or cloud rail, can cause communication to be believed
Number Doppler frequency shift phenomenon, cause transmitting terminal and receiving end signal frequency point inconsistent；Train is quickly cut cell edge band
It changes, from an operating condition to another operating condition, communication channel characteristics are also changed correspondingly, lead to signal of communication handover delay phenomenon,
It may cause the packet loss of communication signal transmissions；In train-ground communication link the transmission real-time of signal be also need emphasis consider because
Element is related to signal propagation delay time phenomenon in train-ground communication link；In train-ground communication interactive process, from extraneous interference, example
Such as noise can equally bring the transmission quality of train-ground communication link signal and seriously affect.
At least there are the following problems in the prior art for inventor's discovery: existing generally by field trial to train-ground communication chain
Pipeline equipment is tested, and testing cost is high, difficulty is big, the period is long, and can not the performance for wireless communications to equipment surveyed comprehensively
Examination.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of wireless multipath fading channel simulator system and method, can be to setting
Standby performance for wireless communications tested comprehensively, convenient test and at low cost.
In order to solve the above technical problems, embodiments of the present invention provide a kind of wireless multipath fading channel simulator system
System, comprising: host computer, converter unit and baseband processing unit；The host computer includes: user control unit and channel system
Number generation unit；The user control unit is used for basis for channel model parameters, the channel coefficients generation unit to be arranged
The channel model parameters calculate the shock response coefficient of channel fading model；The converter unit is used for RF test signal
It is converted into the signal of default frequency range, and is transmitted to the baseband processing unit；The baseband processing unit is used for described default
The signal of frequency range carries out multipath delay processing, and according to the shock response coefficient and the default frequency range handled through multipath delay
Signal the baseband signal of decline is calculated.
Embodiments of the present invention additionally provide a kind of wireless multipath fading information channel simulation method, comprising: setting channel mould
Shape parameter；The shock response coefficient of channel fading model is calculated according to the channel model parameters；The radio frequency testing that will be received
Signal is converted into the signal of default frequency range；Multipath delay processing is carried out to the signal of the default frequency range；It is rung according to the impact
Answer coefficient and the signal of the default frequency range handled through multipath delay that the baseband signal of decline is calculated.
Channel model parameters are arranged in terms of existing technologies, by host computer in embodiment of the present invention, and according to letter
Road model parameter calculation obtains the shock response coefficient of channel fading model, is converted into RF test signal by converter unit
The signal of default frequency range, and multipath delay processing is carried out by signal of the baseband processing unit to default frequency range, and according to punching
The baseband signal of decline is calculated in the signal for hitting response coefficient and the default frequency range handled through multipath delay, to realize nothing
The decline of line multipath signal, and then for vehicle etc. communication links test equipment provides Simulation Test Environment, it can not only be to its nothing
It linearly can be carried out comprehensive test, and convenient test, at low cost.
In addition, the channel coefficients generation unit is specifically used for that the shock response system is calculated according to the following formula
Number:
Wherein,
It is describedIndicate that shock response coefficient, N indicate the quantity of frequency point, the NiIndicating i-th of frequency point, the θ is
Phase angle, the Δ fiIt is the gap size of adjacent frequency；π is constant, and n indicates n-th of harmonic wave, the ci,nIndicate n-th it is humorous
Coefficient of the wave in i-th of frequency point, the fi,nIndicate n-th of harmonic wave in i-th of frequency point frequency values, it is describedIndicate harmonic wave function
Rate, t indicate the time.
In addition, the baseband processing unit is also used to carry out interference superposition to the baseband signal of the decline, so as to imitative
Channel circumstance under very more complicated operating condition.
In addition, the baseband processing unit is specifically used for realizing multipath delay with shift register fashion.
In addition, the baseband processing unit is realized using field programmable gate array, to can guarantee the real-time of emulation.
In addition, the channel coefficients generation unit is communicated to connect by PCIe bus and the baseband processing unit, PCIe
Bus transfer rate is high, it is ensured that the real-time of emulation.
In addition, the channel model parameters include following one or any combination thereof: relative time delay, relative power, how general
Strangle extension, the diameter number in channel fading path, Doppler frequency shift, input/output signal reference level and channel frequency point.By right
Channel model parameters carry out flexible setting, so as to simulate the channel circumstance under various operating conditions.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the structural schematic diagram of the wireless multipath fading channel simulator system of first embodiment according to the present invention；
Fig. 2 is the partial wave adding model analog channel model structure schematic diagram of first embodiment according to the present invention；
Fig. 3 is the flow chart of the wireless multipath fading information channel simulation method of second embodiment according to the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details
And various changes and modifications based on the following respective embodiments, the application technical solution claimed also may be implemented.
The first embodiment of the present invention is related to a kind of wireless multipath fading channel simulator systems.Wireless multipath fading letter
Road analogue system includes host computer and slave computer.Host computer includes: user control unit and channel coefficients generation unit.With
Family control unit is used to be calculated according to the channel model parameters of setting for channel model parameters, channel coefficients generation unit to be arranged
The shock response coefficient of channel fading model.Slave computer includes: converter unit and baseband processing unit.Converter unit is used for will
RF test signal is converted into the signal of default frequency range, and is transmitted to baseband processing unit.Baseband processing unit is used for default
The signal of frequency range carries out multipath delay processing, and according to shock response coefficient and the letter of the default frequency range handled through multipath delay
The baseband signal of decline number is calculated.Channel model parameters are arranged by host computer in present embodiment, and according to channel model
The shock response coefficient of channel fading model is calculated in parameter, and RF test signal is converted into default frequency by converter unit
The signal of section, and multipath delay processing is carried out by signal of the baseband processing unit to default frequency range, and according to shock response
The baseband signal of decline is calculated in coefficient and the signal of the default frequency range handled through multipath delay, to realize wireless multi-path
The decline of signal, and then for vehicle etc. communication links test equipment provides Simulation Test Environment, it can not only be to its wireless performance
It is tested comprehensively, and convenient test, at low cost.Below to the wireless multipath fading channel simulator system of present embodiment
Realize details be specifically described, the following contents only for convenience of understand provide realization details, not implement this programme must
Palpus.
Wireless multipath fading channel simulator system in present embodiment is as shown in Figure 1, host computer includes: user's control list
Member and channel coefficients generation unit.Host computer can be so without being limited thereto using PC, tablet computer etc..User control unit packet
Include hardware parameter configuration subelement, input signal measurement subelement and model parameter setting subelement, input signal measurement
Unit is specifically used for the size of measurement input radio frequency signal, and hardware parameter configures subelement can be to the input radio frequency signal of measurement
Size and input reference level be compared judgement, to realize the function of zoom automatic gain.Hardware parameter is matched
Set subelement can also local frequency to slave computer, radio-frequency channel quantity, reference level, gain control etc. be configured, so
It is without being limited thereto.Wherein each channel has independent local oscillator, real in slave computer converter unit to the signal Frequency mixing processing for entering channel
The Up/Down Conversion for now entering each channel signal is handled, so that slave computer supports multi channel signals transmission.
Model parameter setting subelement is for being arranged channel model parameters, wherein channel model parameters are for example including following
One of or any combination thereof: relative time delay, relative power, doppler spread, the diameter number in channel fading path, Doppler frequency shift,
Input/output signal reference level and channel frequency point, it is so without being limited thereto.Channel model parameters based on user setting, Ji Kegai
The shock response coefficient for becoming channel fading model, when which is loaded into baseband processing unit, so that it may generate different
Channel fading effect, thus the signal of communication under the complicated and diversified operating condition such as overhead, ground, tunnel, away minor segment can be passed
Defeated channel characteristics are simulated.
Channel coefficients generation unit is specifically used for receiving the channel model parameters that model parameter setting subelement inputs, and counts
Calculate obtain different operating conditions get off ground communication link in channel fading model shock response coefficient, and by PCIe bus transfer extremely
Baseband processing unit in slave computer.Specifically, channel coefficients generation unit includes that channel parameter generates subelement and impact
Response coefficient computation subunit.Wherein, channel parameter generates subelement and is specifically used for receiving model parameter setting subelement setting
Channel parameter, shock response coefficient computation subunit be specifically used for channel coefficients generate the received channel parameter of subelement into
Row calculates, and obtains the shock response coefficient of channel, and be transferred to the baseband processing unit of slave computer.
Wherein, the basic model of channel is established in host computer in advance, and by synthesize the signal of a plurality of diameter
A kind of analog channel environment in some channel under to operating condition.Present embodiment is based on harmony superposition and proposes a kind of channel mould
Type method for building up can be used for establishing generalized channel model, every diameter can be made to obey corresponding letter by parameter configuration
Road model, such as: Rayleigh channel model, Rice channel model etc..In practical applications, can according to different communication protocol,
Such as the communication protocols such as 3GPP are directed to train-ground communication channel requirements with configuring vehicle channel model.
The channel coefficients generation unit of present embodiment is specifically used for that shock response coefficient is calculated according to the following formula:
fi,n=n* Δ fi(3)；
It is describedIndicate that shock response coefficient, N indicate the quantity of frequency point, the NiIndicating i-th of frequency point, the θ is
Phase angle, the Δ fiIt is the gap size of adjacent frequency；π is constant, and n indicates n-th of harmonic wave, the ci,nIndicate n-th it is humorous
Coefficient of the wave in i-th of frequency point, the fi,nIndicate n harmonic wave in i-th of frequency point frequency values, it is describedIndicate harmonic power, t
Indicate the time.
Above-mentioned formula (one) is by formulaBe evolved, due to
Cannot be simulated on computer N be intended to it is infinite, so formula (four), which is converted to N, is not intended to infinite formula (one).Pass through
Above-mentioned formula (one) can be truly reflected channel circumstance very much.
The Computing Principle of the shock response coefficient of the present embodiment is described as follows below:
The fading channel (i.e. shock response coefficient computation subunit) of channel simulator be using harmony superposition principle come
It realizes, may be implemented the design of Simulation of a variety of channel models, such as the Rayleigh of classics, Lay this channel model.
Real Gaussian random process can be simulated with partial wave adding model, be simulated by a pair of of partial wave adding model (SOS) multiple
Gaussian random process.Using the unlimited superposition with equidistant frequency and phaseweighting method harmonic function, random process is established
μi(t)。
In formula
fi,n=n* Δ fi (3)
Wherein, phase fi,n=n Δ fi(n=1,2,3 ..., Ni) be section (0,2 π] on obey it is equally distributed with
Machine variable, parameter Δ fiSelection be to cover entire corresponding frequency range for formula (1), and assume that it meets following spy
Property: work as NiWhen → ∞, there is Δ fi→0。Sμμ(f) power spectrum of reception signal is indicated.
If only by limited quantity NiHarmonic function generate channel, can be obtained another random processAre as follows:
Assuming that parameter c at this timei,nAnd fi,nIt has been provided respectively by above formula, and θi,nIt is to obey equally distributed stochastic variable,
When meeting NiWhen → ∞,At this point,It is a deterministic process or certainty function.Therefore by Fig. 2 with
Machine simulation model obtains a simulation model.In NiUnder conditions of → ∞, deterministic processIt is intended to mistake at random
Journey μi(t) a sampling function.
Statistical property close to random process μi(t), therefore,Referred to as real certainty random process.
Finally, shock response coefficient is completedGeneration, realize a pair of of partial wave adding model (SOS) analog channel mistake
Journey.
Converter unit moves processing for realizing intermediate-freuqncy signal needed for radiofrequency signal and baseband processing unit.Specifically
Ground, converter unit include upconverter and low-converter.Upconverter is used for the RF test signal of input (such as vehicle
Rf frequency is 5.9GHz in link) it is filtered, low noise, mixing, bandpass filtering, a system such as AGC (automatic growth control)
Column processing, thus intermediate-freuqncy signal needed for RF test signal is converted to baseband processing unit.Upconverter is used for base band
The intermediate-freuqncy signal of processing unit output is launched after carrying out a series of processing such as AGC, bandpass filtering, to be train-ground communication chain
Pipeline equipment provides test signal.
Baseband processing unit is for realizing core processings such as the acquisition of intermediate-freuqncy signal, generation and whole system channel algorithms
Program.Baseband processing unit can be realized using on-site programmable gate array FPGA.
Baseband processing unit includes: Digital Down Convert subelement, the first sampling rate conversion subelement, multipath generation son list
The corresponding time delay of first, multiple signal paths generates subelement and channel fading subelement, interference load subelement, the second sampling
Rate converts subelement, Digital Up Convert subelement.
In the stage of reception, Digital Down Convert subelement is believed by the processed intermediate frequency original quantisation number of analog-digital converter
Number carry out Digital Down Convert (DDC), the first sampling rate conversion subelement for realizing sampling rate conversion processing.Wherein, under number
Frequency conversion subelement is specifically used for being mixed, filtered etc. to realize Digital Down Convert function to the intermediate-freuqncy signal of quantization.Multipath
Subelement is generated to be used to the signal resolution of the mulitpath entered in a channel obtaining multipath signal out.Wherein, multipath
Signal is identical as the multipath diameter number in the shock response coefficient that host computer generates, and for example, 24.Wherein, delay is comprising inherently prolonging
When and each path between relative time delay.Relative time delay between each paths is since signal of communication passes through different transmission path
Transmission range when being transmitted is different, therefore the time for reaching base station is different.Specifically, the maximum delay between two paths
Interval can be set to 10 microseconds.First sampling rate conversion subelement is for realizing relative time delay, and specifically, the first sample rate becomes
Subelement is changed for converting digital sampling rate to respective value, in practical applications, can use the IP Core of Xilinx company
(IP core) generates variable sampling rate filter, realizes to the delay process of quantization digital signal, then carries out digital processing.
The specific implementation principle of relative time delay is, when generating variable sampling rate filter using Xilinx IP Core, to filter
Device, which works normally, needs an initialization time, and initialization time is related to the value of sample rate, and therefore, initialization time can be with
For characterizing relative time delay.Delay of the inherent delay between input and output signal, for example, 1.2 seconds (20MHz bandwidth).Tool
Body, time delay generates the intrinsic time delay that subelement is used to generate each path.In present embodiment, multiple time delays generate subelement
It can use the Broad RAM on the FPGA board of clock driving baseband processing unit, obtained with shift register fashion a plurality of
The time delay in path, so as to obtain the inherent delay in multiple paths simultaneously.
Baseband processing unit can be by PCIe bus with DMA (Direct Memory Access, direct memory access)
Mode reads the shock response coefficient of channel coefficients generation unit output, and each channel fading subelement is used for each multipath delay
Signal carries out dot product with shock response coefficient respectively and is multiplied, and the result that interference load subelement is used to for dot product being multiplied is added dry
It disturbs, such as the interference of the types such as AWGN (white Gaussian noise interference) or CW (continuous wave CO_2 laser), to realize channel fading mould
Type load, the baseband signal to be declined.
In launching phase, the second sampling rate conversion subelement carries out sampling rate conversion, at Digital Up Convert subelement (DUC)
Reason obtains quantization digital signal, and is transferred to digital analog converter, and digital signal is converted to analog signal, is finally delivered to change
Frequency device carries out upconversion process, exports the fading signal of simulation.
Wherein, baseband processing unit can be realized using FPGA module, so as to improve the emulation of baseband processing unit
Real-time.
Present embodiment compared with prior art, in laboratory environments, by the way that model parameter is arranged, believe by the analog limit
Road environment, such as the communication quality of verifying motor-car or cloud rail under limit velocity, can be to (overhead, ground, tunnel under different operating conditions
Road, away minor segment) signal transmission environment carries out fast verification, and can make designer in the design initial stage to train-ground communication
Link signal transmission performance is verified.
Second embodiment of the invention is related to a kind of wireless multipath fading information channel simulation method, is applied to such as the first embodiment party
Wireless multipath fading channel simulator system described in formula.Referring to Fig. 3, the emulation mode of present embodiment include step 301 to
Step 306.
Step 301: setting channel model parameters.
Channel model parameters such as following one or any combination thereof: relative time delay, relative power, doppler spread, letter
Diameter number, Doppler frequency shift, input/output signal reference level and the channel frequency point of road fading paths, it is so without being limited thereto.It is based on
The channel model parameters of user setting can believe the communication under the complicated and diversified operating condition such as overhead, ground, tunnel, away minor segment
Number transmission channel characteristics are simulated.
Step 302: the shock response coefficient of channel fading model is calculated according to channel model parameters.
Specifically, the basic model of channel is established in host computer in advance, and by synthesizing the signal of a plurality of diameter
Obtain a kind of analog channel environment in some channel under operating condition.Present embodiment is based on harmony superposition and proposes a kind of channel
Method for establishing model can be used for establishing generalized channel model, by parameter configuration, every diameter can be made to obey corresponding
Channel model, such as: Rayleigh channel model, Rice channel model etc..It in practical applications, can be according to different communication protocols
View, such as the communication protocols such as 3GPP are directed to train-ground communication channel requirements with configuring vehicle channel model.
The channel coefficients generation unit of present embodiment is specifically used for that shock response coefficient is calculated according to the following formula:
fi,n=n* Δ fi(3)；
It is describedIndicate that shock response coefficient, N indicate the quantity of frequency point, the NiIndicating i-th of frequency point, the θ is
Phase angle, the Δ fiIt is the gap size of adjacent frequency；π is constant, and n indicates n-th of harmonic wave, the ci,nIndicate n-th it is humorous
Coefficient of the wave in i-th of frequency point, the fi,nIndicate n-th of harmonic wave in i-th of frequency point frequency values, it is describedIndicate harmonic wave function
Rate, t indicate the time.Above-mentioned formula (one) is by formulaIt is evolved,
Due to cannot simulate on computers N be intended to it is infinite, so formula (four), which is converted to N, is not intended to infinite formula
(1).It can be very truly reflected channel circumstance by above-mentioned formula (one), to reflect channel validity.
Step 303: the RF test signal received is converted into the signal of default frequency range.
Specifically, can by low-converter to the RF test signal of input (such as vehicle in link rf frequency be
It 5.9GHz) is filtered, low noise, mixing, bandpass filtering, a series of processing such as AGC (automatic growth control), thus by radio frequency
Intermediate-freuqncy signal needed for test signal is converted to baseband processing unit.
Step 304: multipath delay processing is carried out to the signal of default frequency range.
In the stage of reception, Digital Down Convert is carried out to by the processed intermediate frequency original quantisation digital signal of analog-digital converter
(DDC) and sampling rate conversion is handled.Wherein, Digital Down Convert subelement is specifically used for mixing the intermediate-freuqncy signal of quantization
Frequently, filtering etc. is to realize Digital Down Convert function.Multipath generates subelement for that will enter the mulitpath in a channel
Signal resolution come out and obtain multipath signal.Wherein, the multipath diameter in shock response coefficient that multipath signal and host computer generate
Number is identical, and for example, 24.Wherein, delay includes the relative time delay between inherent delay and each path.Inherent delay is input
Delay between output signal, for example, 1.2 seconds (20MHz bandwidth).Specifically, time delay generates subelement for generating every
The intrinsic time delay in path.In present embodiment, multiple time delays, which generate subelement, can use clock driving baseband processing unit
Broad RAM on FPGA board obtains the time delay of mulitpath with shift register fashion, multiple so as to obtain simultaneously
The inherent delay in path.And the relative time delay between each paths is to be transmitted due to signal of communication by different transmission path
When transmission range it is different, therefore the time for reaching base station is different.Specifically, the maximum delay interval between two paths can be with
It is set as 10 microseconds.First sampling rate conversion subelement is for realizing relative time delay, specifically, the first sampling rate conversion subelement
For converting digital sampling rate to respective value, in practical applications, IP Core (the knowledge production of Xilinx formula can use
Weigh core) variable sampling rate filter is generated, it realizes to the delay process of quantization digital signal, then carries out digital processing.It is opposite to prolong
When specific implementation principle be, using Xilinx IP Core generate variable sampling rate filter when, to make filter normal
One initialization time of need of work, and initialization time is related to the value of sample rate, therefore, initialization time can be used for table
Levy relative time delay.
Step 305: being calculated and declined according to the signal of shock response coefficient and the default frequency range handled through multipath delay
The baseband signal fallen.
Baseband processing unit can be by PCIe bus with DMA (Direct Memory Access, direct memory access)
Mode reads the shock response coefficient of channel coefficients generation unit output, and each channel fading subelement is used for each multipath delay
Signal carries out dot product with shock response coefficient respectively and is multiplied the baseband signal to be declined.
Step 306: interference superposition is carried out to the baseband signal of decline.
The result addition interference that interference load subelement is used to for dot product being multiplied, such as the types such as AWGN or CW are dry
It disturbs, to realize that channel fading model loads.
Present embodiment compared with prior art, in laboratory environments, by the way that model parameter is arranged, believe by the analog limit
Road environment, such as the communication quality of verifying motor-car or cloud rail under limit velocity, can be to (overhead, ground, tunnel under different operating conditions
Road, away minor segment) signal transmission environment carries out fast verification, and can make designer in the design initial stage to train-ground communication
Link signal transmission performance is verified.
It is not difficult to find that present embodiment is embodiment of the method corresponding with first embodiment, present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, which is not described herein again.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
The step of various methods divide above, be intended merely to describe it is clear, when realization can be merged into a step or
Certain steps are split, multiple steps are decomposed into, as long as including identical logical relation, all in the protection scope of this patent
It is interior；To adding inessential modification in algorithm or in process or introducing inessential design, but its algorithm is not changed
Core design with process is all in the protection scope of the patent.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of wireless multipath fading channel simulator system characterized by comprising host computer and slave computer；
The host computer includes: user control unit and channel coefficients generation unit；
The user control unit is used for the institute according to setting for channel model parameters, the channel coefficients generation unit to be arranged
State the shock response coefficient that channel model parameters calculate channel fading model；
The slave computer includes: converter unit and baseband processing unit；
The converter unit is used to for RF test signal being converted into the signal of default frequency range, and is transmitted to the Base-Band Processing list
Member；
The baseband processing unit is used to carry out multipath delay processing to the signal of the default frequency range, and is rung according to the impact
Answer coefficient and the signal of the default frequency range handled through multipath delay that the baseband signal of decline is calculated.
2. wireless multipath fading channel simulator system according to claim 1, which is characterized in that the channel coefficients generate
Unit is specifically used for that the shock response coefficient is calculated according to the following formula:
Wherein,
It is describedIndicate that shock response coefficient, N indicate the quantity of frequency point, the NiIndicate that i-th of frequency point, the θ are phases
Angle, the Δ fiIt is the gap size of adjacent frequency；π is constant, and n indicates n-th of harmonic wave, the ci,nIndicate that n-th of harmonic wave exists
The coefficient of i-th of frequency point, the fi,nIndicate n-th of harmonic wave in i-th of frequency point frequency values, it is describedIndicate harmonic power, t
Indicate the time.
3. wireless multipath fading channel simulator system according to claim 1, which is characterized in that the baseband processing unit
It is also used to carry out interference superposition to the baseband signal of the decline.
4. wireless multipath fading channel simulator system according to claim 1, which is characterized in that the baseband processing unit
Specifically for realizing multipath delay with shift register fashion.
5. wireless multipath fading channel simulator system according to claim 1, which is characterized in that the baseband processing unit
It is realized using field programmable gate array.
6. wireless multipath fading channel simulator system according to claim 1, which is characterized in that the channel coefficients generate
Unit is communicated to connect by PCIe bus and the baseband processing unit.
7. wireless multipath fading channel simulator system according to claim 1, which is characterized in that the channel model parameters
Including following one or any combination thereof:
Relative time delay, relative power, doppler spread, the diameter number in channel fading path, Doppler frequency shift, input/output signal ginseng
Examine level and channel frequency point.
8. a kind of wireless multipath fading information channel simulation method characterized by comprising
Channel model parameters are set；
The shock response coefficient of channel fading model is calculated according to the channel model parameters；
The RF test signal received is converted into the signal of default frequency range；
Multipath delay processing is carried out to the signal of the default frequency range；
The base band of decline is calculated according to the signal of the shock response coefficient and the default frequency range handled through multipath delay
Signal.
9. wireless multipath fading information channel simulation method according to claim 8, which is characterized in that described according to the channel
The shock response coefficient of model parameter calculation channel fading model specifically includes:
The shock response coefficient is calculated according to the following formula:
Wherein,
It is describedIndicate that shock response coefficient, N indicate the quantity of frequency point, the NiIndicate that i-th of frequency point, the θ are phases
Angle, the Δ fiIt is the gap size of adjacent frequency；π is constant, and n indicates n-th of harmonic wave, the ci,nIndicate that n-th of harmonic wave exists
The coefficient of i-th of frequency point, the fi,nIndicate n-th of harmonic wave in i-th of frequency point frequency values, it is describedIndicate harmonic power, t
Indicate the time.
10. wireless multipath fading information channel simulation method according to claim 8, which is characterized in that described according to
After the baseband signal of decline is calculated in shock response coefficient and the signal of the default frequency range handled through multipath delay, also wrap
It includes:
Interference superposition is carried out to the baseband signal of the decline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162628.6A CN109039508B (en) | 2018-09-30 | 2018-09-30 | Wireless multipath fading channel simulation system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162628.6A CN109039508B (en) | 2018-09-30 | 2018-09-30 | Wireless multipath fading channel simulation system and method |
Publications (2)
| Publication Number | Publication Date |
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| CN109039508A true CN109039508A (en) | 2018-12-18 |
| CN109039508B CN109039508B (en) | 2022-04-08 |
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| CN113655715A (en) * | 2021-07-27 | 2021-11-16 | 中国地质大学（武汉） | Performance optimization method of multi-channel discrete network control system |
| CN114257263A (en) * | 2021-11-22 | 2022-03-29 | 中电科思仪科技股份有限公司 | High-mobility channel simulation device and method based on triggering |
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