CN105187232A - Dynamic channel simulation device and method - Google Patents
Dynamic channel simulation device and method Download PDFInfo
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- CN105187232A CN105187232A CN201510433576.1A CN201510433576A CN105187232A CN 105187232 A CN105187232 A CN 105187232A CN 201510433576 A CN201510433576 A CN 201510433576A CN 105187232 A CN105187232 A CN 105187232A
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Abstract
The invention provides a dynamic channel simulation device and method applicable in multiple mobile communication scenarios. The method comprises the following steps: selecting a channel mode through a user software interface, configuring and calculating the corresponding channel parameter and performing the fixed-point processing to the parameter, then transferring the fixed-point channel parameter to a field programmable gate array (FPGA) through a data interface, selecting the parameter storage location by the FPGA according to the channel mode selected by the user, configuring the channel parameter to a channel simulator in real time, and realizing the dynamic channel simulation in the FPGA. The dynamic channel simulation further comprises two channel modes including a mobile channel mode and a birth-death channel mode, furthermore, the simulation device is capable of realizing the static channel simulation.
Description
Technical field
The present invention relates to wireless information transfer technical field, particularly a kind of dynamic channel analogue means, also relate to a kind of dynamic channel analogy method, for dynamic channel simulation during mobile communication scene.
Background technology
Dynamic channel simulator can simulate actual mobile communication scene in the lab on the impact of radio signal propagation, is widely used in research and development and the test of mobile communication equipment.Along with the high speed development of mobile communication technology, people are more and more higher to the reliability of radio communication, stability and security requirement.But mobile telecommunication channel has the features such as easy decay, strong jamming, instability, and in mobile communication process, channel status constantly changes along with the change of communication environment.In communication equipment R&D process, need to consider that mobile channel characteristic is on the impact of its performance, actual scene test needs human and material resources and the financial resources of at substantial, and test channel state has unpredictability and nonrepeatability.Therefore need to simulate mobile communication scene in the lab, repeatedly simulation test mobile channel characteristic, on the impact of communication equipment performance, to shorten the R&D cycle, reduces R&D costs repeatedly.
Under dynamic scene, the dual-mode antenna of communication equipment is in mobile status, and communication environments constantly changes, and the channel parameters such as time delay, maximum doppler frequency and path loss should have randomness.Meanwhile, the consecutive variations of channel scenario also causes the regular consecutive variations of time delay, maximum doppler frequency and path loss.T lower channel impulse response theoretical model can be expressed as
Wherein, t represents the time;
the path loss become during expression, channel fading and multidiameter delay parameter.Dynamic channel time become impulse response as shown in Figure 1.Dynamic channel can be divided into mobile channel and the raw channel two kinds that goes out, and wherein, mobile channel changes in time and changes the path delay of time; The raw channel that goes out is then that two distinguishable footpath time delays alternately become (" life ") and constant (" going out "), and the position of change is random.
Current radio channel analogy method mainly contains two kinds: the first utilizes emulation of the computer software to simulate, and the second utilizes signal processing chip to carry out channel simulation.These two kinds of methods respectively have pluses and minuses, and emulation of the computer software can Simulation of Complex channel model, and carry out complicated algorithm design, realize precision high, but the method algorithm complex is higher, arithmetic speed is slow; Signal processing chip carries out channel simulation fast operation, and real-time is high, but is subject to the restriction of hardware resource, can not carry out complicated algorithm design, and it is limited to realize precision.
In existing instrument and equipment, the PropsimF8 of Yi Lai bit company, it can support 3GPP/3GPP2, WCDMA, GSM, TD-SCDMA etc. simultaneously, can meet the simulation test demand of mobile telecommunication channel under most of scene; The base band generator of Agilent company and channel simulator N5106A, support 160MHz bandwidth, can simulate dynamic channel, maximum support 24 footpath; The SR5500 of Spirent company for the advanced receivers with diversity Wave beam forming and MIMO, can emulate complicated broadband wireless channel feature accurately, can realize complicated mimo channel test.But most products only supports that static channel is simulated, or only support dynamic channel simulation or raw one of going out in channel simulation, this patent not only supports that static channel is simulated, and also supports dynamic channel and the raw channel simulation that goes out, can support multiple fading type.
Existing channel simulation device only supports that static channel is simulated, or only supports mobile channel simulation or raw one of going out in channel simulation, and in addition, the most complicated operation of existing apparatus, cost is higher.
Summary of the invention
For the above-mentioned shortcoming of prior art, the object of this invention is to provide a kind of dynamic channel analogue means based on software and radio technique and method, static channel, mobile channel and the raw channel three kind channel simulation that goes out can be supported, multiple fading type can be supported, have simple to operate, low cost and other advantages.
Technical scheme of the present invention is achieved in that
A kind of dynamic channel analogue means, comprising: customer parameter dispensing unit, radio frequency input unit, channel parameter memory cell, channel simulation unit, radio frequency output unit;
Customer parameter dispensing unit output is connected with channel parameter memory cell input by data-interface, for customer parameter configuration, calculation of parameter, parameter transmission;
The output of radio frequency input unit is connected with channel simulation unit input, for receiving each channel radio frequency signal, being mixed to intermediate frequency respectively, and intermediate-freuqncy signal is converted to digital signal by under each channel radio frequency signal, be input to channel simulation unit respectively;
The input of channel parameter memory cell is connected with customer parameter dispensing unit output, output is connected with channel simulation unit input, and described channel parameter memory cell comprises channel parameter buffer, clock counter, channel parameter register, outside high-speed memory;
The input of channel simulation unit is connected with the output of radio frequency input unit with channel parameter memory cell respectively, output is connected with the input of radio frequency output unit with channel parameter memory cell respectively, and described channel simulation unit comprises Up/Down Conversion module, channel simulation module; The intermediate-freuqncy signal that channel simulation unit receives is down-converted to baseband signal by down conversion module, is then transferred to channel simulation module, and the complex baseband signal exported after channel simulation is upconverted to intermediate frequency by up-converter module, is then transferred to radio frequency output unit; Channel simulation module comprises simulating multi-path time delay, path loss, multipath fading, shadow fading and interchannel noise;
The input of radio frequency output unit is connected with channel simulation unit output, is converted to analog signal for the multichannel digital intermediate frequency signal exported by channel simulation unit, and filtering image component also difference uppermixing, to radio frequency, then exports to external equipment.
Alternatively, described channel parameter buffer realizes in FPGA, receives user and transmits channel parameter, according to the frame originating point information Selection parameter memory location in customer parameter, when channelling mode is static channel, then channel parameter is directly outputted to channel parameter register, then carry out channel simulation; Channelling mode be mobile channel or raw go out channel time, then send write command to channel parameter memory cell, and channel parameter be sent to external memory storage.
Alternatively, described clock counter is driven by 100MHz system clock in FPGA, according to channel status retention time interval externally memory send and read parameter instruction, and send the channel parameter of configuration instruction configures subsequent time to parameter register.
Alternatively, described channel parameter register realizes in FPGA, and store the channel parameter of current channel condition, when channelling mode is static channel, the channel parameter in channel parameter register does not change; Channelling mode be mobile channel or raw go out channel time, according to the channel parameter reading the next channel status of instruction fetch that clock counter sends, after reading, according to the configuration-direct of clock counter, channel parameter is passed to channel simulation unit.
Alternatively, described outside high-speed memory storing mobile channel and the channel state parameter under the raw channelling mode that goes out, according to the write command that parameter buffer sends, channel parameter is stored into external memory unit, what send according to parameter register reads instruction delivery channel parameter.
Based on above-mentioned analogue means, present invention also offers a kind of dynamic channel analogy method, first, by user software interface selective channel pattern and configurating channel parameter, then, by data-interface, channel parameter is passed to FPGA, parameter storage is carried out according to user's selective channel pattern by FPGA, intermediate frequency is mixed to by under input radio frequency signal by radio frequency input module, carry out again being down-converted to base band in FPGA, baseband signal declines according to user's configuration parameter analog channel, time delay, loss, and superpose interchannel noise, again through upconverting to intermediate-freuqncy signal, output to radio frequency output unit uppermixing to radio frequency.
Alternatively, described customer parameter configuration selects each channel bank pattern by user, comprises static channel, mobile channel and the raw channel Three models that goes out; Then by user's configurating channel parameter, fading paths number, each footpath time delay, loss, fading type, translational speed, communication frequency, signal to noise ratio under static schema, is configured; Fading paths number, fading type, initial translational speed, translational acceleration, communication frequency, path loss, basic time delay, Delay Variation scope, Delay Variation speed, signal to noise ratio is configured under dynamic mode; Translational speed, communication frequency, path loss, basic time delay, Delay Variation scope, time delay spacing, the raw positional number that goes out, raw go out cycle, signal to noise ratio is configured under raw pattern of going out.
Alternatively, described calculation of parameter calculates channel parameter, line parameter fixed point of going forward side by side according to user's configuration parameter, and concrete steps comprise:
1) translational speed is set according to user and calculates Doppler frequency;
During static channel, calculate Doppler frequency according to formula (1),
During mobile channel, first starting velocity v is set according to user
0, translational acceleration α and formula (2) calculate moment t
ktime translational speed, then calculate Doppler frequency this moment according to formula (1),
v＝v
0+at
k(2)
2) each path delay of time is calculated according to user's parameters;
During mobile channel pattern, the basic time delay τ in each path is set according to user
l, 0, Delay Variation scope (τ
min, τ
max), Delay Variation speed Δ τ and formula (3), calculate each path t
kthe path delay of time in moment,
τ
l，k＝τ
l，0+Δτ·t
k(3)
And meet 0≤τ
min≤ Δ τ t
k≤ τ
max≤ 40us;
Raw go out channelling mode time, according to user, basic time delay τ is set
l, 0, Delay Variation scope (τ
min, τ
max), time delay spacing Δ τ, raw positional number M and the formula (4) of going out, calculate each path t
kthe path delay of time in moment,
τ
l，k＝τ
l，k-1+Δτ·R(4)
Wherein, τ
l, k-1represent that l paths is at t
k-1the time delay in moment, R is the equally distributed random number of [1, M] interval interior obedience, and meets 0≤τ
minΔ τ R≤τ
max≤ 40us, τ
max=τ
min+ Δ τ (M-1);
3) each path fading type is set according to user and frequency spectrum calculates each path fading factor, discrete Doppler and phase place;
4) calculating channel parameter is carried out fixed point process.
Alternatively, described parameter transmission is, according to user's selective channel pattern, fixed point channel parameter is assembled framing in certain sequence, adds frame originating point information, comprises channelling mode, channel renewal rate, signal to noise ratio, be transferred to FPGA by data-interface.
Alternatively, described channel simulation module is used for simulating multi-path time delay, path loss, multipath fading, shadow fading and interchannel noise, and concrete steps comprise:
1) according to the path number in parameter register and each path delay of time parameter, the baseband signal exported by down conversion module, through multi-path delay module, outputs signal to path loss module;
2) produce path loss according to each path loss parameter in parameter register, output signal to multipath fading module;
3) each path fetched stochastic variable is produced according to each path multipath fading type in parameter register and the channel parameter in parameter register, and be multiplied with input complex baseband signal respectively, produce multipath fading, output signal to shadow fading module;
4) according to each path shadow fading parameter in parameter register, produce shadow fading variable, be multiplied with input signal respectively, produce shadow fading, each path signal is superposed, outputs to interchannel noise module;
5) produce multiple Gaussian random variable, calculate input complex baseband signal power, according to the signal to noise ratio in parameter register, adjustment noise power, is added on input signal, delivery channel analog signal;
6), during dynamic channel pattern, step 1 is repeated according to the configuration-direct that clock counter sends) ~ 5), until user is out of service.
The invention has the beneficial effects as follows:
(1) software and radio technique is adopted, configure at PC end and calculate channel parameter, adopting the real-time configurating channel parameter of high-speed processing apparatus, analog channel decline in FPGA, static channel, mobile channel, the raw channel Three models that goes out can be supported, support multiple fading type simultaneously;
(2) in FPGA, realize channel fading real-time Simulation, structure be simple, favorable expandability.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Impulse response schematic diagram is become when Fig. 1 is dynamic channel;
Fig. 2 is binary channels dynamic channel analogue means theory diagram of the present invention;
Fig. 3 is customer parameter dispensing unit flow chart of the present invention;
Fig. 4 is channel parameter framing structure schematic diagram of the present invention;
Fig. 5 is single channel dynamic channel simulated implementation block diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Existing channel simulation device only supports that static channel is simulated, or only supports mobile channel simulation or raw one of going out in channel simulation, and in addition, the most complicated operation of existing apparatus, cost is higher.
The present invention proposes a kind of the dynamic channel analogue means and the method that are applicable to various kinds of mobile communication scene, by user software interface selective channel pattern, configuration calculates corresponding channel parameter and carries out fixed point to parameter, then by data-interface, fixed point channel parameter is passed to FPGA, by FPGA according to user's selective channel mode selection parameter memory location, again channel parameter is configured in real time to channel simulator, in FPGA, realize dynamic channel simulation.Dynamic channel simulation comprises again mobile channel and the raw channel two kinds of channelling modes that go out, and in addition, analogue means of the present invention can also realize static channel simulation.
As shown in Figure 2, dynamic channel analogue means of the present invention comprises customer parameter dispensing unit, radio frequency input unit, channel parameter memory cell, channel simulation unit, radio frequency output unit.
Customer parameter dispensing unit output is connected with channel parameter memory cell input by data-interface, comprising: customer parameter configuration feature, calculation of parameter function, parameter transmission function.
As shown in Figure 3, customer parameter configuration feature selects each channel bank pattern by user, comprises static channel, mobile channel and the raw channel Three models that goes out, then by user's configurating channel parameter, configuration fading paths number is needed under static schema, each footpath time delay, loss, fading type, translational speed, communication frequency, signal to noise ratio etc., configuration fading paths number is needed under dynamic mode, fading type, initial translational speed, translational acceleration, communication frequency, path loss, basic time delay, Delay Variation scope, Delay Variation speed, signal to noise ratio etc., need to configure translational speed under raw pattern of going out, communication frequency, path loss, basic time delay, Delay Variation scope, time delay spacing, the raw positional number that goes out, life is gone out the cycle, signal to noise ratio etc.
Calculation of parameter function, calculate channel parameter according to user's configuration parameter, line parameter fixed point of going forward side by side, concrete steps are as follows:
1) translational speed is set according to user and calculates Doppler frequency;
During static channel, calculate Doppler frequency according to formula (1),
During mobile channel, first starting velocity v is set according to user
0, translational acceleration α and formula (2) calculate moment t
ktime translational speed, then calculate Doppler frequency this moment according to formula (1),
v＝v
0+at
k(2)
2) each footpath time delay is calculated according to user's parameters;
During mobile channel pattern, the basic time delay τ in each footpath is set according to user
l, 0, Delay Variation scope (τ
min, τ
max), Delay Variation speed Δ τ and formula (3), calculate each footpath t
kthe path delay of time in moment,
τ
l，k＝τ
l，0+Δτ·t
k(3)
And meet 0≤τ
min≤ Δ τ t
k≤ τ
max≤ 40us;
Raw go out channelling mode time, according to user, basic time delay τ is set
l, 0, Delay Variation scope (τ
min, τ
max), time delay spacing Δ τ, raw positional number M and the formula (4) of going out, calculate each footpath t
kthe path delay of time in moment,
τ
l，k＝τ
l，k-1+Δτ·R(4)
Wherein, τ
l, k-1represent that l article of footpath is at t
k-1the time delay in moment, R is the equally distributed random number of [1, M] interval interior obedience, and meets 0≤τ
min≤ Δ τ R≤τ
max≤ 40us, τ
max=τ
min+ Δ τ (M-1);
3) each footpath fading type is set according to user and frequency spectrum calculates each footpath fading factor, discrete Doppler and phase place etc.;
4) calculating channel parameter is carried out fixed point process.
Parameter transmission function, assembles framing according to user's selective channel pattern in certain sequence by fixed point channel parameter, adds frame originating point information, comprises channelling mode, channel renewal rate, signal to noise ratio etc., as shown in Figure 4, be transferred to FPGA by data-interface.
Radio frequency input unit, this unit output is connected with channel simulation unit input, for receiving multi-channel radio frequency signal, being mixed to intermediate frequency respectively, and intermediate-freuqncy signal is converted to digital signal by under each channel radio frequency signal, be input to channel simulation unit respectively.
Channel parameter memory cell, this unit input is connected with customer parameter dispensing unit output, and this unit output is connected with channel simulation unit input, mainly comprise channel parameter buffer, clock counter, channel parameter register, outside high-speed memory, as shown in Figure 5.
Channel parameter buffer, realizes in FPGA, is mainly used in receiving user and transmits channel parameter, according to the frame originating point information Selection parameter memory location in customer parameter, when channelling mode is static channel, then channel parameter is directly outputted to channel parameter register, then carry out channel simulation; Channelling mode be mobile channel or raw go out channel time, then send write command to channel parameter memory cell, and channel parameter be sent to external memory storage.
Clock counter, is driven by 100MHz system clock in FPGA, according to channel status retention time interval externally memory send and read parameter instruction, and send the channel parameter of configuration instruction configures subsequent time to parameter register.
Channel parameter register, realizes in FPGA, and be mainly used in the channel parameter storing current channel condition, when channelling mode is static channel, the channel parameter in channel parameter register does not change; Channelling mode be mobile channel or raw go out channel time, according to the channel parameter reading the next channel status of instruction fetch that clock counter sends, after reading, according to the configuration-direct of clock counter, channel parameter is passed to channel simulation unit.
Outside high-speed memory, be mainly used in the channel state parameter under storing mobile channel and the raw channelling mode that goes out, according to the write command that parameter buffer sends, channel parameter is stored into external memory unit, what send according to parameter register reads instruction delivery channel parameter.
Channel simulation unit, this unit input is connected with the output of radio frequency input unit with channel parameter memory cell respectively, output is connected with the input of parameter storage unit with radio frequency output unit respectively, mainly comprises Up/Down Conversion module, channel simulation module.
Up/Down Conversion module, the intermediate-freuqncy signal that down conversion module is mainly used in channel simulation unit receives is down-converted to baseband signal, then channel simulation module is transferred to, the complex baseband signal exported after channel simulation is mainly upconverted to intermediate frequency by up-converter module, is then transferred to radio frequency output unit.
Channel simulation module, major function comprises simulating multi-path time delay, path loss, multipath fading, shadow fading and interchannel noise.Concrete steps are as follows:
1) according to the path number in parameter register and each footpath delay parameter, the baseband signal exported by down conversion module, through multidiameter delay module, outputs signal to path loss module;
2) produce path loss according to each footpath loss parameter in parameter register, output signal to multipath fading module;
3) each path fetched stochastic variable is produced according to each path multipath fading type in parameter register and the channel parameter in parameter register, and be multiplied with input complex baseband signal respectively, produce multipath fading, output signal to shadow fading module;
4) according to each path shadow fading parameter in parameter register, produce shadow fading variable, be multiplied with input signal respectively, produce shadow fading, each path signal is superposed, outputs to interchannel noise module;
5) produce multiple Gaussian random variable, calculate input complex baseband signal power, according to the signal to noise ratio in parameter register, adjustment noise power, is added on input signal, delivery channel analog signal;
6), during dynamic channel pattern, step (1) ~ (5) are repeated, until user is out of service according to the configuration-direct that clock counter sends.
Radio frequency output unit, this unit input is connected with channel simulation unit output, is converted to analog signal for the two passage digital intermediate frequency signals exported by channel simulation unit, and filtering image component also difference uppermixing, to radio frequency, then exports to external equipment.
During dynamic channel analogue means work of the present invention, first user software interface selective channel pattern is passed through and configurating channel parameter, then by data-interface, channel parameter is passed to FPGA, parameter storage is carried out according to user's selective channel pattern by FPGA, intermediate frequency is mixed to by under input radio frequency signal by radio frequency input module, carry out again being down-converted to base band in FPGA, baseband signal declines according to user's configuration parameter analog channel, time delay, loss, and superpose interchannel noise, again through upconverting to intermediate-freuqncy signal, output to radio frequency output unit uppermixing road radio frequency.
Dynamic channel analogue means of the present invention, based on software and radio technique, supports multi-channel mode, and each passage all supports static channel, mobile channel and the raw channel Three models that goes out, and maximum dynamic delay 40us, delay resolution is 10ns.Example in Fig. 2 of the present invention is two channel patterns, and those skilled in the art can adopt multi-channel mode according to instruction of the present invention.
Dynamic channel analogue means of the present invention and method, adopt software and radio technique, configure at PC end and calculate channel parameter, adopt the real-time configurating channel parameter of high-speed processing apparatus, analog channel decline in FPGA, static channel, mobile channel, the raw channel Three models that goes out can be supported, support multiple fading type simultaneously; In FPGA, realize channel fading real-time Simulation, structure be simple, favorable expandability.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a dynamic channel analogue means, is characterized in that, comprising: customer parameter dispensing unit, radio frequency input unit, channel parameter memory cell, channel simulation unit, radio frequency output unit;
Customer parameter dispensing unit output is connected with channel parameter memory cell input by data-interface, for customer parameter configuration, calculation of parameter, parameter transmission;
The output of radio frequency input unit is connected with channel simulation unit input, for receiving each channel radio frequency signal, being mixed to intermediate frequency respectively, and intermediate-freuqncy signal is converted to digital signal by under each channel radio frequency signal, be input to channel simulation unit respectively;
The input of channel parameter memory cell is connected with customer parameter dispensing unit output, output is connected with channel simulation unit input, and described channel parameter memory cell comprises channel parameter buffer, clock counter, channel parameter register, outside high-speed memory;
The input of channel simulation unit is connected with the output of radio frequency input unit with channel parameter memory cell respectively, output is connected with the input of radio frequency output unit with channel parameter memory cell respectively, and described channel simulation unit comprises Up/Down Conversion module, channel simulation module; The intermediate-freuqncy signal that channel simulation unit receives is down-converted to baseband signal by down conversion module, is then transferred to channel simulation module, and the complex baseband signal exported after channel simulation is upconverted to intermediate frequency by up-converter module, is then transferred to radio frequency output unit; Channel simulation module comprises simulating multi-path time delay, path loss, multipath fading, shadow fading and interchannel noise;
The input of radio frequency output unit is connected with channel simulation unit output, is converted to analog signal for the multichannel digital intermediate frequency signal exported by channel simulation unit, and filtering image component also difference uppermixing, to radio frequency, then exports to external equipment.
2. dynamic channel analogue means as claimed in claim 1, it is characterized in that, described channel parameter buffer realizes in FPGA, receive user and transmit channel parameter, according to the frame originating point information Selection parameter memory location in customer parameter, when channelling mode is static channel, then channel parameter is directly outputted to channel parameter register, then carry out channel simulation; Channelling mode be mobile channel or raw go out channel time, then send write command to channel parameter memory cell, and channel parameter be sent to external memory storage.
3. dynamic channel analogue means as claimed in claim 1, it is characterized in that, described clock counter is driven by 100MHz system clock in FPGA, according to channel status retention time interval externally memory send and read parameter instruction, and send the channel parameter of configuration instruction configures subsequent time to parameter register.
4. dynamic channel analogue means as claimed in claim 1, it is characterized in that, described channel parameter register realizes in FPGA, stores the channel parameter of current channel condition, when channelling mode is static channel, the channel parameter in channel parameter register does not change; Channelling mode be mobile channel or raw go out channel time, according to the channel parameter reading the next channel status of instruction fetch that clock counter sends, after reading, according to the configuration-direct of clock counter, channel parameter is passed to channel simulation unit.
5. dynamic channel analogue means as claimed in claim 1, it is characterized in that, described outside high-speed memory storing mobile channel and the channel state parameter under the raw channelling mode that goes out, according to the write command that parameter buffer sends, channel parameter is stored into external memory unit, what send according to parameter register reads instruction delivery channel parameter.
6. the dynamic channel analogy method based on analogue means described in any one of claim 1-5, it is characterized in that, first, by user software interface selective channel pattern and configurating channel parameter, then, by data-interface, channel parameter is passed to FPGA, parameter storage is carried out according to user's selective channel pattern by FPGA, intermediate frequency is mixed to by under input radio frequency signal by radio frequency input module, carry out again being down-converted to base band in FPGA, baseband signal declines according to user's configuration parameter analog channel, time delay, loss, and superpose interchannel noise, again through upconverting to intermediate-freuqncy signal, output to radio frequency output unit uppermixing to radio frequency.
7. dynamic channel analogy method as claimed in claim 6, is characterized in that, described customer parameter configuration selects each channel bank pattern by user, comprises static channel, mobile channel and the raw channel Three models that goes out; Then by user's configurating channel parameter, fading paths number, each footpath time delay, loss, fading type, translational speed, communication frequency, signal to noise ratio under static schema, is configured; Fading paths number, fading type, initial translational speed, translational acceleration, communication frequency, path loss, basic time delay, Delay Variation scope, Delay Variation speed, signal to noise ratio is configured under dynamic mode; Translational speed, communication frequency, path loss, basic time delay, Delay Variation scope, time delay spacing, the raw positional number that goes out, raw go out cycle, signal to noise ratio is configured under raw pattern of going out.
8. dynamic channel analogy method as claimed in claim 6, is characterized in that, described calculation of parameter calculates channel parameter, line parameter fixed point of going forward side by side according to user's configuration parameter, and concrete steps comprise:
1) translational speed is set according to user and calculates Doppler frequency;
During static channel, calculate Doppler frequency according to formula (1),
During mobile channel, first starting velocity v is set according to user
0, translational acceleration a and formula (2) calculate moment t
ktime translational speed, then calculate Doppler frequency this moment according to formula (1),
v＝v
0+at
k(2)
2) each path delay of time is calculated according to user's parameters;
During mobile channel pattern, the basic time delay τ in each path is set according to user
l, 0, Delay Variation scope (τ
min, τ
max), Delay Variation speed Δ τ and formula (3), calculate each path t
kthe path delay of time in moment,
τ
l，k＝τ
l，0+Δτ·t
k(3)
And meet 0≤τ
min≤ Δ τ t
k≤ τ
max≤ 40us;
Raw go out channelling mode time, according to user, basic time delay τ is set
l, 0, Delay Variation scope (τ
min, τ
max), time delay spacing Δ τ, raw positional number M and the formula (4) of going out, calculate each path t
kthe path delay of time in moment,
τ
l，k＝τ
l，k-1+Δτ·R(4)
Wherein, τ
l, k-1represent that l paths is at t
k-1the time delay in moment, R is the equally distributed random number of [1, M] interval interior obedience, and meets 0≤τ
min≤ Δ τ R≤τ
max≤ 40us, τ
max=τ
min+ Δ τ (M-1);
3) each path fading type is set according to user and frequency spectrum calculates each path fading factor, discrete Doppler and phase place;
4) calculating channel parameter is carried out fixed point process.
9. dynamic channel analogy method as claimed in claim 6, it is characterized in that, described parameter transmission is, according to user's selective channel pattern, fixed point channel parameter is assembled framing in certain sequence, add frame originating point information, comprise channelling mode, channel renewal rate, signal to noise ratio, be transferred to FPGA by data-interface.
10. dynamic channel analogy method as claimed in claim 6, is characterized in that, described channel simulation module is used for simulating multi-path time delay, path loss, multipath fading, shadow fading and interchannel noise, and concrete steps comprise:
1) according to the path number in parameter register and each path delay of time parameter, the baseband signal exported by down conversion module, through multi-path delay module, outputs signal to path loss module;
2) produce path loss according to each path loss parameter in parameter register, output signal to multipath fading module;
3) each path fetched stochastic variable is produced according to each path multipath fading type in parameter register and the channel parameter in parameter register, and be multiplied with input complex baseband signal respectively, produce multipath fading, output signal to shadow fading module;
4) according to each path shadow fading parameter in parameter register, produce shadow fading variable, be multiplied with input signal respectively, produce shadow fading, each path signal is superposed, outputs to interchannel noise module:
5) produce multiple Gaussian random variable, calculate input complex baseband signal power, according to the signal to noise ratio in parameter register, adjustment noise power, is added on input signal, delivery channel analog signal;
6), during dynamic channel pattern, step 1 is repeated according to the configuration-direct that clock counter sends) ~ 5), until user is out of service.
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| CN106059685A (en) * | 2016-05-17 | 2016-10-26 | 南京航空航天大学 | Large scale MIMO channel simulation apparatus under time evolution and simulation method thereof |
| CN106506104A (en) * | 2016-12-01 | 2017-03-15 | 中国电子科技集团公司第四十研究所 | A kind of portable wireless channel simulation device |
| CN106533593A (en) * | 2016-11-15 | 2017-03-22 | 中国电子科技集团公司第四十研究所 | Synchronous-random-access-memory-based dynamic multi-path time delay simulation apparatus and method |
| CN110569134A (en) * | 2019-08-30 | 2019-12-13 | 北京电子工程总体研究所 | method and system for simulating target time delay based on normal distribution |
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| CN106059685A (en) * | 2016-05-17 | 2016-10-26 | 南京航空航天大学 | Large scale MIMO channel simulation apparatus under time evolution and simulation method thereof |
| CN106533593A (en) * | 2016-11-15 | 2017-03-22 | 中国电子科技集团公司第四十研究所 | Synchronous-random-access-memory-based dynamic multi-path time delay simulation apparatus and method |
| CN106533593B (en) * | 2016-11-15 | 2019-12-10 | 中国电子科技集团公司第四十一研究所 | Dynamic multipath time delay simulation device and method based on synchronous random access memory |
| CN106506104A (en) * | 2016-12-01 | 2017-03-15 | 中国电子科技集团公司第四十研究所 | A kind of portable wireless channel simulation device |
| CN110569134A (en) * | 2019-08-30 | 2019-12-13 | 北京电子工程总体研究所 | method and system for simulating target time delay based on normal distribution |
| CN111064503A (en) * | 2019-12-30 | 2020-04-24 | 长光卫星技术有限公司 | Satellite channel high dynamic time delay Doppler simulation system |
| CN111064503B (en) * | 2019-12-30 | 2021-12-03 | 长光卫星技术有限公司 | Satellite channel high dynamic time delay Doppler simulation system |
| CN113612560A (en) * | 2021-09-16 | 2021-11-05 | 西安交通大学 | Unmanned aerial vehicle channel simulation method, device and system for three-dimensional MIMO channel simulation |
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