CN107317643A - A kind of SUZUKI fading channels emulation mode and its analogue system - Google Patents
A kind of SUZUKI fading channels emulation mode and its analogue system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3911—Fading models or fading generators
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Abstract
A kind of SUZUKI fading channels emulation mode and its analogue system, the emulation mode comprise the following steps：（1）Produce signal of communication s (t)；（2）Generate SUZUKI fading channels；（3）SUZUKI fading channels are emulated：Signal of communication s (t) obtains output signal by SUZUKI fading channels, and output signal is analyzed, and verifies the accuracy of SUZUKI fading channels.Also include SUZUKI fading channel analogue systems.SUZUKI fading channels are the products of Rayleigh channel and shadow fading channel, and Rayleigh channel is used to describe multipath fading, and shadow fading channel is used to describe mesoscale decline, can both embody multipath fading process, mesoscale fading process can be embodied again.
Description
Technical field
The present invention relates to wireless communication technology field, a kind of SUZUKI fading channels emulation mode is specifically related to and its imitative
True system.
Background technology
Traditional information channel simulation method is to use Rayleigh channel model, and Rayleigh channel model is nothing in the small range scale of description
The multipath effect and Doppler effect of line channel, are the basic models of radio communication channel.Under rayleigh model, channel magnitude system
Characteristic Rayleigh distributed is counted, phase angle statistics obedience is uniformly distributed, and its Doppler power spectra is classics Jakes power density letters
Number.But the channel model can only embody the mobile radio channel model of small yardstick, it is impossible to which more careful embodiment mesoscale declines
The process (shadow fading process) fallen.
The content of the invention
The technical problems to be solved by the invention are to overcome the shortcomings of that above-mentioned background technology can both embody there is provided a kind of
Multipath fading process, can embody the SUZUKI fading channels emulation mode and its analogue system of mesoscale fading process again.
The present invention solve its technical problem use technical scheme be, a kind of SUZUKI fading channels emulation mode, including
Following steps：
(1) signal of communication s (t) is produced；
(2) SUZUKI fading channels are generated；
(3) SUZUKI fading channels are emulated：Signal of communication s (t) obtains output letter by SUZUKI fading channels
Number, output signal is analyzed, the accuracy of SUZUKI fading channels is verified.
Further, in step (2), the method for generating SUZUKI fading channels is as follows：
(2-1) generates Doppler parameter model, and Doppler parameter model, gained Doppler are generated using zheng models
Parameter model is as follows：
θi,n∈(0,2π)；
C in formulai,nRepresent Doppler coefficient, fi,nRepresent discrete Doppler frequency, θi,nRepresent Doppler phase shift；I=1 tables
Show the parameter of real part, i=0 represents the parameter of imaginary part, and n represents the n-th tunnel sinusoidal signal model, and Ni is sinusoidal signal number, and fm is
Maximum doppler frequency；
(2-2) generates three groups of Doppler parameters using channel parameter generation module；Channel parameter generation module includes first
Doppler frequency shift module, the second Doppler frequency shift module, Tridoppler frequency displacement module are adopted by the first Doppler frequency shift module
First group of Doppler parameter C is generated with zheng modelsi,n1、fi,n1、θi,n1, zheng is used by the second Doppler frequency shift module
Model generates second group of Doppler parameter Ci,n2、fi,n2、θi,n2, generated by Tridoppler frequency displacement module using zheng models
3rd group of Doppler parameter Ci,n3、fi,n3、θi,n3；
(2-3) generates SUZUKI fading channels using channel generation module；Channel generation module is generated including Rayleigh channel
Module and shadow fading channel generation module；Rayleigh channel generation module receives first that the first Doppler frequency shift module transfer comes
Group Doppler parameter Ci,n1、fi,n1、θi,n1And second Doppler frequency shift module transfer come second group of Doppler parameter Ci,n2、
fi,n2、θi,n2, two groups of Gaussian random process Xc (t), Xs (t) are produced by sine-wave superimposed method；
(2-4) Rayleigh channel generation module is by two groups of Gaussian random process Xc (t), and Xs (t) produces Jake types Rayleigh letter
Road：
(2-5) shadow fading channel generation module receives the 3rd group of Doppler ginseng that Tridoppler frequency displacement module transfer comes
Number Ci,n3、fi,n3、θi,n3；One group of Gaussian random process Xa (t) is produced by sine-wave superimposed method,
(2-6) shadow fading channel generation module produces shadow fading channel by Gaussian random process Xa (t)：
γ (t)=e[s*Xa(t)+m]；
S and m are two parameters for being used for adjusting equation in shadow fading channel, for adjusting model to adapt to true ring
Border, s, m value is between 0-1；
(2-7) SUZUKI channel modules receive Rayleigh channel and the shadow fading channel that the transmission of Rayleigh channel generation module comes
The shadow fading channel that generation module transmission comes, Rayleigh channel and shadow fading channel do multiplying, obtain SUZUKI declines
Channel：
Further, in step (3), the parameter m=0, s=0.6, maximum Doppler frequency of setting SUZUKI fading channel emulation
Move fm=500Hz, sampling time Ts=0.5s.
Further, in step (3), it is to the specific method of Output Signal Analysis：
After output signal is obtained, statistics calculating is carried out to output signal：First-order characteristics system is specially done to output signal
Meter, obtains amplitude probability density distribution and the phase probability density distribution of SUZUKI fading channels；Using auto-correlation function to defeated
Go out signal and do second-order characteristics statistics, calculate the autocorrelation and power spectral density of SUZUKI fading channels.
A kind of SUZUKI fading channels analogue system, including signal generator, AD analog-digital converters, channel fabric module,
FPGA processing modules, DA digital analog converters, signal receiver, PC signal processing modules, the signal generator turn with AD moduluses
Parallel operation is connected, and the AD analog-digital converters, channel fabric module are connected with FPGA processing modules respectively, the FPGA processing modules
It is connected with DA digital analog converters, the DA digital analog converters are connected with signal receiver, at the signal receiver and PC signals
Module is managed to be connected；
The signal generator is used to produce required signal of communication；The AD analog-digital converters are used to turn analog signal
Change data signal into；The channel fabric module is used to generate SUZUKI fading channels；The FPGA processing modules are used for logical
Letter signal and SUZUKI fading channels are handled, and signal of communication is passed through UZUKI fading channels；The DA digital analog converters are used
In converting digital signals into analog signal；The signal receiver is used to receive output signal；The PC signal processing modules
For carrying out statistics calculating to output signal.
Further, the channel fabric module includes channel parameter generation module, channel generation module and SUZUKI channels
Module, the channel parameter generation module includes the first Doppler frequency shift module, the second Doppler frequency shift module, Tridoppler
Frequency displacement module；The channel generation module includes Rayleigh channel generation module and shadow fading channel generation module；The channel
Parameter generation module is used to generate three groups of Doppler parameters, and the first Doppler frequency shift module is used to generate first group of Doppler
Parameter, the second Doppler frequency shift module is used to generate second group of Doppler parameter, and the Tridoppler frequency displacement module is used
In the 3rd group of Doppler parameter of generation；The channel generation module is used to generate SUZUKI fading channels；The Rayleigh channel life
It is used to generate Jake type Rayleigh channels into module, the shadow fading channel generation module is used to generate shadow fading channel, institute
State SUZUKI channel modules and receive Rayleigh channel and shadow fading channel generation module biography that the transmission of Rayleigh channel generation module comes
Defeated next shadow fading channel, Rayleigh channel and shadow fading channel do multiplying, obtain SUZUKI fading channels.
Compared with prior art, advantages of the present invention is as follows：
Using SUZUKI fading channel emulation modes, SUZUKI fading channels are multiplying for Rayleigh channel and shadow fading channel
Product, Rayleigh channel is used to describe multipath fading, and shadow fading channel is used to describe mesoscale decline, can both embody small yardstick
Fading process, can embody mesoscale fading process again.
Brief description of the drawings
Fig. 1 is the flow chart that the embodiment of the present invention generates SUZUKI fading channel methods.
Fig. 2 is that the embodiment of the present invention provides s=0, SUZUKI fading channel simulation models during fm=500Hz.
Fig. 3 is that the embodiment of the present invention provides s=0, SUZUKI fading channels amplitude probability density distribution during fm=500Hz
Figure.
Fig. 4 provides s=0 for the embodiment of the present invention, SUZUKI fading channel phase probability density distributions during fm=500Hz
Figure；
Fig. 5 provides s=0 for the embodiment of the present invention, SUZUKI fading channels auto-correlation function emulation knot during fm=500Hz
Fruit is schemed；
Fig. 6 provides s=0 for the embodiment of the present invention, SUZUKI fading channels power spectral density emulation knot during fm=500Hz
Fruit is schemed.
Fig. 7 is the structured flowchart of SUZUKI fading channel analogue systems of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the present invention.
The SUZUKI fading channel emulation modes of the present embodiment comprise the following steps：
(1) signal of communication s (t) is produced；
(2) SUZUKI fading channels are generated；
(3) SUZUKI fading channels are emulated：Signal of communication s (t) obtains output letter by SUZUKI fading channels
Number, output signal is analyzed, the accuracy of SUZUKI fading channels is verified.
In reference picture 1, step (2), the method for generating SUZUKI fading channels is as follows：
(2-1) generate Doppler parameter model, in actual applications, can using MED, MSEM, MEA, LPNM, MEDS, JM,
Any one in zheng models generates Doppler parameter model, and wherein zheng models are the most advanced, application effect is best；
In the present embodiment, Doppler parameter model is generated using zheng models, gained Doppler parameter model is as follows：
θi,n∈(0,2π)；
C in formulai,nRepresent Doppler coefficient, fi,nRepresent discrete Doppler frequency, θi,nRepresent Doppler phase shift；I=1 tables
Show the parameter of real part, i=0 represents the parameter of imaginary part, and n represents the n-th tunnel sinusoidal signal model, and Ni is sinusoidal signal number,
In zheng models, NiIt is maximum doppler frequency that minimum, which may be configured as being set to 16, fm in 8, the present embodiment,.
(2-2) generates three groups of Doppler parameters using channel parameter generation module U1；Channel parameter generation module U1 includes
First Doppler frequency shift module U11, the second Doppler frequency shift module U12, Tridoppler frequency displacement module U13, more than first
General Le frequency displacement module U11 generates first group of Doppler parameter C using zheng modelsi,n1、fi,n1、θi,n1, pass through the second Doppler
Frequency displacement module U12 generates second group of Doppler parameter C using zheng modelsi,n2、fi,n2、θi,n2, pass through Tridoppler frequency displacement
Module U13 generates the 3rd group of Doppler parameter C using zheng modelsi,n3、fi,n3、θi,n3；
(2-3) utilizes channel generation module U2 generation SUZUKI fading channels；Channel generation module U2 includes Rayleigh channel
Generation module U21 and shadow fading channel generation module U22；Rayleigh channel generation module U21 receives the first Doppler frequency shift mould
First group of Doppler parameter C that block U11 transmission comesi,n1、fi,n1、θi,n1And second Doppler frequency shift module U12 transmission come the
Two groups of Doppler parameter Ci,n2、fi,n2、θi,n2, two groups of Gaussian random process Xc (t), Xs (t) are produced by sine-wave superimposed method；
(2-4) Rayleigh channel generation module U21 produces Jake type Rayleighs by two groups of Gaussian random process Xc (t), Xs (t)
Channel：
(2-5) shadow fading channel generation module U22 receives more than the 3rd group of Tridoppler frequency displacement module U13 transmission
General Le parameter Ci,n3、fi,n3、θi,n3；Produced by sine-wave superimposed method
One group of Gaussian random process Xa (t)
(2-6) shadow fading channel generation module U22 produces shadow fading channel by Gaussian random process Xa (t)：
γ (t)=e[s*Xa(t)+m]；
S and m are two parameters for being used for adjusting equation in shadow fading channel, for adjusting model to adapt to true ring
Border, s, m value is between 0-1；
(2-7) SUZUKI channel modules U3 receives the next Rayleigh channel of Rayleigh channel generation module U21 transmission and shade declines
Fall the shadow fading channel that channel generation module U22 transmission comes, Rayleigh channel and shadow fading channel do multiplying, obtained
SUZUKI fading channels：
In step (3), the parameter m=0, s=0.6, maximum doppler frequency fm=of setting SUZUKI fading channel emulation
500Hz, sampling time Ts=0.5s.
In step (3), it is to the specific method of Output Signal Analysis：
After output signal is obtained, statistics calculating is carried out to output signal：First-order characteristics system is specially done to output signal
Meter, obtains amplitude probability density distribution and the phase probability density distribution of SUZUKI fading channels；Using auto-correlation function to defeated
Go out signal and do second-order characteristics statistics, calculate the autocorrelation and power spectral density of SUZUKI fading channels.
In step (3), obtained simulation result is as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6.
Reference picture 7, the analogue system that SUZUKI fading channels emulation mode of the present invention is used, including signal generator
U71, AD analog-digital converter U72, channel fabric module U73, FPGA processing module U74, DA digital analog converter U75, signal are received
Device U76, PC signal processing module U77, signal generator U71 are connected with AD analog-digital converters U72, AD analog-digital converters U72, letter
Road frame modules U73 is connected with FPGA processing modules U74 respectively, and FPGA processing modules U74 is connected with DA digital analog converters U75,
DA digital analog converters U75 is connected with signal receiver U76, and signal receiver U76 is connected with PC signal processing modules U77.
Signal generator U71 is used to produce required signal of communication；AD analog-digital converters U72 is used to change analog signal
Into data signal；Channel fabric module U73 is used to generate SUZUKI fading channels；FPGA processing modules U74 is used to believe communication
Number and SUZUKI fading channels handled, signal of communication is passed through UZUKI fading channels；DA digital analog converters U75 is used for will
Data signal is converted into analog signal；Signal receiver U76 is used to receive output signal；PC signal processing modules U77 be used for pair
Output signal carries out statistics calculating.
Channel fabric module U73 includes channel parameter generation module U1, channel generation module U2 and SUZUKI channel module
U3, channel parameter generation module U1 include the first Doppler frequency shift module U11, the second Doppler frequency shift module U12, general more than the 3rd
Strangle frequency displacement module U13；Channel generation module U2 includes Rayleigh channel generation module U21 and shadow fading channel generation module U22.
Channel parameter generation module U1 is used to generate three groups of Doppler parameters, and the first Doppler frequency shift module U11 is used to give birth to
Into first group of Doppler parameter, the second Doppler frequency shift module U12 is used to generate second group of Doppler parameter, Tridoppler frequency
Shifting formwork block U13 is used to generate the 3rd group of Doppler parameter.
Channel generation module U2 is used to generate SUZUKI fading channels；Rayleigh channel generation module U21 is used to generate Jake
Type Rayleigh channel, shadow fading channel generation module U22 is used to generate shadow fading channel, and SUZUKI channel modules U3 receives auspicious
The shadow fading letter that the Rayleigh channel and shadow fading channel generation module U22 transmission that sharp channel generation module U21 transmission comes are come
Road, Rayleigh channel and shadow fading channel do multiplying, obtain SUZUKI fading channels.
The specific work process of analogue system is：Signal generator U71 produces required signal of communication s (t), sends AD to
Analog-digital converter U72, AD analog-digital converter U72 receives to carry out the signal of communication s (t) that automatic signal generator U71 is sent, and to signal
Carry out discrete sampling digitized processing；And send the data after processing to FPGA processing modules U74.Channel fabric module U73
SUZUKI fading channel η (t) are produced, and are transferred to FPGA processing modules U74；FPGA processing modules U74 is received from AD moduluses
Converter U72 and channel fabric module U73 data, carry out computing, obtain the signal after SUZUKI fading channels, concurrently
Deliver to DA digital analog converters U75, DA digital analog converter U75 and receive the signal from FPGA processing modules U74, be converted into mould
Intend signal, send to signal receiver U76, signal receiver U76 receives output signal, and output signal is sent to PC letters
Number processing module U77, PC signal processing module U77 is analyzed and processed to output signal.
The present invention uses SUZUKI fading channel emulation modes, and SUZUKI fading channels are Rayleigh channel and shadow fading letter
The product in road, Rayleigh channel is used to describe multipath fading, and shadow fading channel is used to describe mesoscale decline, can both embodied
Multipath fading process, can embody mesoscale fading process again.
Those skilled in the art can carry out various modifications and variations to the present invention, if these modifications and variations are at this
Within the scope of invention claim and its equivalent technologies, then these modifications and variations are also within protection scope of the present invention.
The prior art that the content not being described in detail in specification is known to the skilled person.
Claims (6)
1. a kind of SUZUKI fading channels emulation mode, it is characterised in that comprise the following steps：
(1) signal of communication s (t) is produced；
(2) SUZUKI fading channels are generated；
(3) SUZUKI fading channels are emulated：Signal of communication s (t) obtains output signal by SUZUKI fading channels,
Output signal is analyzed, the accuracy of SUZUKI fading channels is verified.
2. SUZUKI fading channels emulation mode as claimed in claim 1, it is characterised in that：In step (2), SUZUKI is generated
The method of fading channel is as follows：
(2-1) generates Doppler parameter model, and Doppler parameter model, gained Doppler parameter are generated using zheng models
Model is as follows：
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θi,n∈(0,2π)；
C in formulai,nRepresent Doppler coefficient, fi,nRepresent discrete Doppler frequency, θi,nRepresent Doppler phase shift；I=1 represents real
The parameter in portion, i=0 represents the parameter of imaginary part, and n represents the n-th tunnel sinusoidal signal model, and Ni is sinusoidal signal number, and fm is maximum
Doppler frequency shift；
(2-2) generates three groups of Doppler parameters using channel parameter generation module；It is general that channel parameter generation module includes more than first
Frequency displacement module, the second Doppler frequency shift module are strangled, Tridoppler frequency displacement module is used by the first Doppler frequency shift module
Zheng models generate first group of Doppler parameter Ci,n1、fi,n1、θi,n1, zheng moulds are used by the second Doppler frequency shift module
Type generates second group of Doppler parameter Ci,n2、fi,n2、θi,n2, by Tridoppler frequency displacement module using zheng models generation the
Three groups of Doppler parameter Ci,n3、fi,n3、θi,n3；
(2-3) generates SUZUKI fading channels using channel generation module；Channel generation module includes Rayleigh channel generation module
With shadow fading channel generation module；Rayleigh channel generation module receives more than first group of the first Doppler frequency shift module transfer
General Le parameter Ci,n1、fi,n1、θi,n1And second Doppler frequency shift module transfer come second group of Doppler parameter Ci,n2、fi,n2、
θi,n2, two groups of Gaussian random process Xc (t), Xs (t) are produced by sine-wave superimposed method；
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(2-4) Rayleigh channel generation module produces Jake type Rayleigh channels by two groups of Gaussian random process Xc (t), Xs (t)：
(2-5) shadow fading channel generation module receives the 3rd group of Doppler parameter that Tridoppler frequency displacement module transfer comes
Ci,n3、fi,n3、θi,n3；One group of Gaussian random process Xa (t) is produced by sine-wave superimposed method,
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(2-6) shadow fading channel generation module produces shadow fading channel by Gaussian random process Xa (t)：
γ (t)=e[s*Xa(t)+m]；
S and m are two parameters for being used for adjusting equation in shadow fading channel, for adjusting model to adapt to true environment,
S, m value is between 0-1；
(2-7) SUZUKI channel modules receive Rayleigh channel and the generation of shadow fading channel that the transmission of Rayleigh channel generation module comes
The shadow fading channel that module transfer comes, Rayleigh channel and shadow fading channel do multiplying, obtain SUZUKI fading channels：
3. SUZUKI fading channels emulation mode as claimed in claim 2, it is characterised in that：In step (3), SUZUKI is set
The parameter m=0, s=0.6, maximum doppler frequency fm=500Hz, sampling time Ts=0.5s of fading channel emulation.
4. the SUZUKI fading channel emulation modes as described in claim 3 or 2, it is characterised in that：In step (3), to output
The specific method of signal analysis is：
After output signal is obtained, statistics calculating is carried out to output signal：First-order characteristics statistics is specially done to output signal, is obtained
Amplitude probability density distribution and phase probability density distribution to SUZUKI fading channels；Using auto-correlation function to output signal
Second-order characteristics statistics is done, the autocorrelation and power spectral density of SUZUKI fading channels is calculated.
5. a kind of analogue system of SUZUKI fading channel emulation modes applied to described in claim 1-4, it is characterised in that：
Received including signal generator, AD analog-digital converters, channel fabric module, FPGA processing modules, DA digital analog converters, signal
Device, PC signal processing modules, the signal generator are connected with AD analog-digital converters, the AD analog-digital converters, channel fabric
Module is connected with FPGA processing modules respectively, and the FPGA processing modules are connected with DA digital analog converters, the DA digital-to-analogue conversions
Device is connected with signal receiver, and the signal receiver is connected with PC signal processing modules；
The signal generator is used to produce required signal of communication；The AD analog-digital converters are used to convert analog signals into
Data signal；The channel fabric module is used to generate SUZUKI fading channels；The FPGA processing modules are used to believe communication
Number and SUZUKI fading channels handled, signal of communication is passed through UZUKI fading channels；The DA digital analog converters are used for will
Data signal is converted into analog signal；The signal receiver is used to receive output signal；The PC signal processing modules are used for
Statistics calculating is carried out to output signal.
6. analogue system as claimed in claim 5, it is characterised in that：The channel fabric module includes channel parameter and generates mould
Block, channel generation module and SUZUKI channel modules, the channel parameter generation module include the first Doppler frequency shift module, the
Two Doppler frequency shift modules, Tridoppler frequency displacement module；The channel generation module includes Rayleigh channel generation module and the moon
Shadow fading channel generation module；The channel parameter generation module is used to generate three groups of Doppler parameters, first Doppler
Frequency displacement module is used to generate first group of Doppler parameter, and the second Doppler frequency shift module is used to generate second group of Doppler's ginseng
Number, the Tridoppler frequency displacement module is used to generate the 3rd group of Doppler parameter；The channel generation module is used to generate
SUZUKI fading channels；The Rayleigh channel generation module is used to generate Jake type Rayleigh channels, the shadow fading channel life
It is used to generate shadow fading channel into module, the SUZUKI channel modules receive the Rayleigh that the transmission of Rayleigh channel generation module comes
The shadow fading channel that channel and the transmission of shadow fading channel generation module come, Rayleigh channel and shadow fading channel do multiplication fortune
Calculate, obtain SUZUKI fading channels.
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