CN109412620A - A kind of method for processing received signal and device of environment backscatter communication system - Google Patents
A kind of method for processing received signal and device of environment backscatter communication system Download PDFInfo
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- CN109412620A CN109412620A CN201811042531.1A CN201811042531A CN109412620A CN 109412620 A CN109412620 A CN 109412620A CN 201811042531 A CN201811042531 A CN 201811042531A CN 109412620 A CN109412620 A CN 109412620A
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- 238000012935 Averaging Methods 0.000 claims abstract description 41
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 19
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
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Abstract
The invention discloses the method for processing received signal and device of a kind of environment backscatter communication system.It is related to the communications field；The signal-to-noise ratio for receiving signal can be improved well and reduces bit error rate, while effectively extending reliable communication distance.The method for processing received signal of the environment backscatter communication system includes: building bistable state potential well system, carries out nonlinear filtering to the reception signal, obtains filtered output signals；Low frequency sampling is carried out to the filtered output signals, obtains discrete signal；Segmental averaging processing is carried out to the discrete signal, obtains segmental averaging signal；Threshold judgement is carried out to the segmental averaging signal, obtains transmission signal.The reception signal processing apparatus of the environment backscatter communication system includes: nonlinear filtering module；Low speed analog-to-digital conversion module；Segmental averaging module；Judging module.
Description
Technical field
The present invention relates to the communications fields, particularly relate to a kind of method for processing received signal of environment backscatter communication system
With device.
Background technique
With the development of the internet of things era, following communication equipment will be provided with the characteristics such as miniaturization, low energy consumption, long-life.
However communication equipment at this stage is limited by and provides the battery size and energy consumption of energy for it, so that Internet of Things related application is difficult to
It is extensive to implement.Therefore the size of equipment energy supplying system how is effectively reduced, equipment energy consumption is reduced and extends service life of equipment,
It is Internet of Things related fields a great problem urgently to be resolved.
Backscatter communication (Backscattering Communication, BC) is by passively collecting and being penetrated using having
Frequency energy carries out signal and sends and receives, and can effectively solve Internet of Things without the communication mode of self-energy feed system
Relevant device size and energy consumption problem.However backscatter communication mode needs receiving end to emit big energy, and can not carry out
Equipment room two-way communication.Environment in recent years backscatter communication (Ambient Backscattering Communication,
AmBC) mode attracts wide attention.This communication system be not necessarily to completely RF energy transmitting and merely with existing in environment
Radiofrequency signal is communicated, and the transmission of equipment room two-way signaling may be implemented.However there is also lack for environment backscatter system
It falls into, information carrier of the ambient radio-frequency signal as the system, the variation of usually unknown and high dynamic, often make connecing for receiving end
The collection of letters number has compared with low signal-to-noise ratio and higher bit error rate, brings to the design of environment backscatter communication system receiving terminal huge tired
Difficulty, and significantly limit the reliable communication distance of the system.
Summary of the invention
In view of this, it is an object of the invention to propose a kind of reception signal processing side of environment backscatter communication system
Method and device can effectively improve the signal-to-noise ratio for receiving signal, reduce the bit error rate for receiving signal, it is reliable extend communication away from
From.
Based on above-mentioned purpose, a kind of method for processing received signal of environment backscatter communication system provided by the invention,
Include:
Bistable state potential well system is constructed, nonlinear filtering is carried out to the reception signal, obtains filtered output signals；
Low frequency sampling is carried out to the filtered output signals, obtains discrete signal；
Segmental averaging processing is carried out to the discrete signal, obtains segmental averaging signal；
Threshold judgement is carried out to the segmental averaging signal, obtains transmission signal.
Optionally, the building bistable state potential well system carries out nonlinear filtering to the reception signal, obtains filtering defeated
Signal includes: out
Construct bistable state potential well system；
The dynamic system parameter for adjusting the bistable state potential well system, make the bistable state potential well system input signal,
Noise and the bistable state potential well system reach statistics resonance；
According to the dynamic system parameter of the bistable state potential well system, nonlinear filtering system is designed, is connect to described
The collection of letters number carries out a nonlinear filtering, obtains the filtered output signals.
Optionally, described that low frequency sampling is carried out to the filtered output signals, obtain discrete signal specifically:
Under the premise of being less than the signal of communication mark space of the environment backscatter communication system in the sampling interval, to institute
It states filtered output signals and carries out low frequency sampling, obtain the discrete signal.
Optionally, described that segmental averaging processing is carried out to the discrete signal, obtain segmental averaging signal specifically:
Using the signal of communication mark space of the environment backscatter communication system as the time cycle, to the discrete signal
Segmental averaging processing is carried out, the segmental averaging signal is obtained.
Optionally, described that threshold judgement is carried out to the segmental averaging signal, obtain transmission signal specifically:
The desired value for choosing the amplitude that decision threshold is the discrete signal, believes the segmental averaging according to decision threshold
It number makes decisions, obtains the transmission signal.
Optionally, the building bistable state potential well system specifically:
The bistable state potential well system can be described as:
V (x, t)=V (x)-A0xcos(Ωt)
Wherein, V indicates potential well system potential function, and x indicates system mode, A0Cos (Ω t) indicates input external force, this external force
It is A for amplitude0, angular frequency is the external periodic force of Ω, and input external force is that the communication of the environment backscatter communication system is believed
Number；
The system mode x can be further described are as follows:
WhereinIndicate lagging phase, n (t) indicates noise, and the intensity of noise n (t) can be indicated with D, i.e. ∫ n (t) n (0)
=2D δ (t)；
Further choose bistable state potential well system are as follows:
Wherein a, b are the dynamic system parameter of the bistable state potential well system；
The potential well height of the bistable state potential well system is Δ V=a2/4b。
Optionally, the dynamic system parameter of the adjustment bistable state potential well system, makes the bistable state potential well system
Input signal, noise and the bistable state potential well system reach statistics resonance specifically:
When the input external force and the noise act on the bistable state potential well system simultaneously, to the bistable situation
The dynamic system parameter a of trap system, b is adjusted, and within the scope of certain noise intensity, can observe the letter of output signal
It makes an uproar than being obviously improved, i.e., the input signal of the described bistable state potential well system, noise reach with the bistable state potential well system
Statistics resonance；
By dynamic system parameter a, the b work of the maximum bistable state potential well system of the signal-to-noise ratio for making the output signal
For the system parameter of the nonlinear filtering system.
Optionally, the dynamic system parameter according to the bistable state potential well system designs nonlinear filtering wave system
System carries out nonlinear filtering to the reception signal, obtains the filtered output signals specifically:
According to nonlinear filtering system described in the System Parameter Design of the nonlinear filtering system；
The system mode of the nonlinear filtering system can be stated are as follows:
WhereinIndicate that the input of the nonlinear filtering system, the input are that the environment is anti-
To the signal of communication of scatter communication system；
The output of the nonlinear filtering system is system mode x (t)；
The working principle of the nonlinear filtering system specifically:
System mode x (t) is carried out ax-bx is calculated3, it is added with the input, obtained result is further accumulated
Partite transport calculates to obtain current time system mode x (t) output as the filtered output signals.
The present invention also provides a kind of reception signal processing apparatus of environment backscatter communication system, comprising:
Nonlinear filtering module: for constructing bistable state potential well system, nonlinear filtering is carried out to the reception signal, is obtained
To filtered output signals；
Low speed analog-to-digital conversion module: for carrying out low frequency sampling to the filtered output signals, discrete signal is obtained；
Segmental averaging module: for carrying out segmental averaging processing to the discrete signal, segmental averaging signal is obtained；
Judging module: for carrying out threshold judgement to the segmental averaging signal, transmission signal is obtained.
From the above it can be seen that a kind of reception signal processing of environment backscatter communication system provided by the invention
Method and apparatus receives signal processing problems for the high dynamic variation of environment backscatter communication system, by constructing bistable state
Potential well system, and the dynamic system parameter for adjusting the bistable state potential well system makes the input in the bistable state potential well system
Signal, noise and the bistable state potential well system reach statistics resonance state, realize to the nonlinear filtering for receiving signal,
Greatly improve filtered output signals signal-to-noise ratio.Further, sampling and decision operation are carried out to filtered output signals, with tradition
Direct sample mean method detects the bit error rate compared to receiving end signal is greatly reduced, so that receiving end is more steady, it is reliable logical
Communication distance extends.Meanwhile statistics resonance filter unit according to the present invention can realize there is pole with simple analog circuit
Low processing complexity extremely agrees with the low energy consumption requirement of environment backscatter communication system；And because filtering output letter
Number have very high signal-to-noise ratio, it is subsequent to the filtered output signals carry out sampling operation only need lower frequency, into
One step reduces processing complexity and energy consumption.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is environment backscatter communication system model schematic diagram；
Fig. 2 is the method for processing received signal process signal of the environment backscatter communication system in the embodiment of the present invention
Figure；
Fig. 3 is the nonlinear filtering of the method for processing received signal of the environment backscatter communication system in the embodiment of the present invention
Wave method flow diagram；
Fig. 4 is the nonlinear filtering of the method for processing received signal of the environment backscatter communication system in the embodiment of the present invention
Wave system system design principle schematic diagram；
Fig. 5 is the reception signal processing apparatus structural representation of the environment backscatter communication system in the embodiment of the present invention
Figure；
Fig. 6 is to pass obtained by the reception signal processing means processes of the environment backscatter communication system in the embodiment of the present invention
Defeated signal and the signal-to-noise ratio comparison diagram without the obtained transmission signal of reception signal processing means processes；
Fig. 7 is to pass obtained by the reception signal processing means processes of the environment backscatter communication system in the embodiment of the present invention
Defeated signal and the bit error rate comparison diagram without the obtained transmission signal of reception signal processing means processes.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention
The non-equal entity of a same names or non-equal parameter, it is seen that " first " " second " only for the convenience of statement, does not answer
It is interpreted as the restriction to the embodiment of the present invention, subsequent embodiment no longer illustrates this one by one.
As shown in Figure 1, being the environment backscatter communication system model schematic diagram.
1 launch environment radiofrequency signal s (t) 2 of emission of radio frequency signals end, the signal theaomni-directional transmission can be launched end 4 and connect
Receiving end 5 receives simultaneously；
After the transmitting terminal 4 receives the ambient radio-frequency signal s (t) 2, by adjusting antenna impedance by signal to be transmitted
It is modulated in the ambient radio-frequency signal s (t) 2, emits signal of communication 3, specific modulation system are as follows:
As signal bit b to be transmittedkWhen=1, the transmitting terminal 4 adjusts antenna impedance mismatch and reflects the ambient radio-frequency
Signal s (t) 2；As signal bit b to be transmittedkWhen=0, the adjustment of transmitting terminal 4 Antenna Impedance Matching, which does not reflect the environment, is penetrated
Frequency signal s (t) 2；
Wherein bk∈ { 1,0 } indicates signal bit to be transmitted, and k indicates bit sequence；
Signal rate to be transmitted is usually slower than ambient radio-frequency signal rate, it is assumed that ambient radio-frequency signal rate is letter to be transmitted
L times of number rate, then ambient radio-frequency signal period TcWith signal period T to be transmitteddBetween relationship are as follows: Td=LTc。
Signal forms of time and space to be transmitted can indicate are as follows:
D (t)=bk,(k-1)Td<t≤kTd
Wherein, d (t) indicates signal to be transmitted, bkIndicate signal bit to be transmitted, k is bit sequence, TdFor letter to be transmitted
Number period.
If the antenna reflection coefficient of the transmitting terminal 4 is α, then the signal y (t) that the transmitting terminal 4 exports, i.e. signal of communication
3 can indicate are as follows:
Y (t)=α d (t) s (t)
Receiving end 5 can receive ambient radio-frequency signal 2 and signal of communication 3；
Input signal is indicated with g (t):
As signal bit b to be transmittedkWhen=0, input signal:
G (t)=s (t)
As signal bit b to be transmittedkWhen=1, input signal:
G (t)=s (t)+α d (t) s (t)
To sum up, the input signal g (t):
Indicate that noise, r (t) indicate the reception signal with n (t), then the reception signal can indicate are as follows:
One aspect of the present invention provides a kind of method for processing received signal of environment backscatter communication system.
As shown in Fig. 2, in a kind of method for processing received signal of environment backscatter communication system provided by the invention
In embodiment, which comprises
S201: building bistable state potential well system carries out nonlinear filtering to the reception signal, obtains filtering output letter
Number；
S202: low frequency sampling is carried out to the filtered output signals, obtains discrete signal；
S203: segmental averaging processing is carried out to the discrete signal, obtains segmental averaging signal；
S204: carrying out threshold judgement to the segmental averaging signal, obtains transmission signal.
As shown in figure 3, in a kind of method for processing received signal of environment backscatter communication system provided by the invention
In embodiment, the S201 constructs bistable state potential well system, carries out nonlinear filtering to the reception signal, obtains filtering output
Signal includes:
S301: building bistable state potential well system；
S302: adjusting the dynamic system parameter of the bistable state potential well system, makes the input of the bistable state potential well system
Signal, noise and the bistable state potential well system reach statistics resonance；
S303: according to the dynamic system parameter of the bistable state potential well system, nonlinear filtering system is designed, to institute
It states and receives signal progress nonlinear filtering, obtain the filtered output signals.
In a kind of embodiment of the method for processing received signal of environment backscatter communication system provided by the invention, institute
State S301 building bistable state potential well system specifically:
The bistable state potential well system can be described as:
V (x, t)=V (x)-A0xcos(Ωt)
Wherein, V indicates potential well system potential function, and x indicates system mode, the input external force A of system0Cos (Ω t) table
Show, this external force is that amplitude is A0, angular frequency is the external periodic force of Ω, and the input external force of the system is the input letter
Number；
The bistable state potential well system can further describe are as follows:
WhereinIndicate lagging phase, n (t) indicates noise, and the intensity of noise n (t) can be indicated with D, i.e. ∫ n (t) n (0)
=2D δ (t)；
The bistable state potential well system can also describe are as follows:
Wherein a, b are the dynamic system parameter of the bistable state potential well system；
The functional value of the bistable state potential well system is in x1Locate minimalization, i.e. two potential wells (corresponding two stable states), institute
State x1=± (a/b)1/2；In x2Place takes maximum, i.e. potential barrier, the x2=0；The potential well height Δ V=of bistable state potential well system
a2/ 4b, the potential barrier prevent transition of the system mode between two stable states；
When without input external force, the state of the bistable state potential well system will be dependent on the noise intensity D in two stable states
Between constantly jump, the enabled state transition frequency of this noise intensity is by Wayne Kramer's Si rate rkDescription:
When input external force and the noise collective effect are when the bistable state potential well system, by Wayne Kramer's Si rate rkCharacterization
Symmetry state transition balance be broken, by adjusting dynamic system parameter a, the b of bistable state potential well system, institute can be made
It states input external force, the noise and the bistable state potential well system and reaches statistics resonance；
When the input external force, the noise and the bistable state potential well system reach statistics resonance, the bistable state
The output of potential well system is desired for (assuming that lagging phase):
Wherein,Indicate output signal amplitude,Indicate phase of output signal, output signal amplitude and output are believed
Number phase specifically indicates to be respectively as follows:
In addition, the Signal to Noise Ratio (SNR) of output signal is embodied as:
When the input external force, the noise and the bistable state potential well system reach statistics resonance, the bistable state
The output signal amplitude and output signal-noise ratio of potential well system all reach maximum value.
In a kind of embodiment of the method for processing received signal of environment backscatter communication system provided by the invention, institute
The dynamic system parameter that S302 adjusts the bistable state potential well system is stated, makes the input signal of the bistable state potential well system, make an uproar
Sound and the bistable state potential well system reach statistics resonance specifically:
When the input external force and the noise act on the bistable state potential well system simultaneously, to the bistable situation
The dynamic system parameter a of trap system, b is adjusted, and within the scope of certain noise intensity, can observe the letter of output signal
It makes an uproar than being obviously improved, i.e., the input signal of the described bistable state potential well system, noise reach with the bistable state potential well system
Statistics resonance；
By dynamic system parameter a, the b work of the maximum bistable state potential well system of the signal-to-noise ratio for making the output signal
For the system parameter of the nonlinear filtering system.
As shown in figure 4, in a kind of method for processing received signal of environment backscatter communication system provided by the invention
In embodiment, the S303 designs nonlinear filtering system according to the dynamic system parameter of the bistable state potential well system,
Nonlinear filtering is carried out to the reception signal, obtains the filtered output signals specifically:
According to nonlinear filtering system described in the System Parameter Design of the nonlinear filtering system；
The system mode of the nonlinear filtering system can be stated are as follows:
Wherein, the input external force of systemThe as described input signal g (t), A0=<g (t)>；
The input of the nonlinear filtering system is input signal g (t), is exported as system mode x (t), Concrete workflow
Journey are as follows:
System mode x (t) is carried out ax-bx is calculated3, it is added with input signal g (t), obtained result is further
Make integral operation and obtains current time system mode x (t) as the filtered output signals.
In a kind of embodiment of the method for processing received signal of environment backscatter communication system provided by the invention, institute
It states S202 and low frequency sampling is carried out to the filtered output signals, obtain discrete signal specifically:
Under the premise of guaranteeing that the sampling interval is less than environment backscatter communication single symbol interval, the filtering is exported
Signal carries out low frequency sampling, if sample frequency is fs, then sampling interval Ts=1/fs, need to meet Td>Ts>Tc；
Use xs(n) it indicates to sample resulting discrete signal, n is sampled point serial number, obtains the discrete signal are as follows:
xs(n)=x (nTs), n=1,2,3 ...
In a kind of embodiment of the method for processing received signal of environment backscatter communication system provided by the invention, institute
It states and segmental averaging processing is carried out to the discrete signal, obtain segmental averaging signal specifically:
Segmental averaging processing is made by the time cycle of environment backscatter communication single symbol interval to the discrete signal,
If the environment backscatter communication sigtnal interval is M times of sampling interval, i.e. Td/Ts=M, then k-th of bit sequence (transmits symbol
For bk) average treatment output result xp(k) it indicates are as follows:
In a kind of embodiment of the method for processing received signal of environment backscatter communication system provided by the invention, institute
It states and threshold judgement is carried out to the segmental averaging signal, obtain transmission signal specifically:
Choose the desired value that decision threshold is the discrete signal amplitude:
Th=< xs(n)>
In turn, transmitted bit is determined according to threshold valueAnd then obtain transmission signal:
Another aspect of the present invention provides a kind of reception signal processing apparatus of environment backscatter communication system.
As shown in figure 5, in a kind of reception signal processing apparatus of environment backscatter communication system provided by the invention
In embodiment, described device includes:
Nonlinear filtering module 501: for constructing bistable state potential well system, nonlinear filtering is carried out to the reception signal
Wave obtains filtered output signals；
Low speed analog-to-digital conversion module 502: for carrying out low frequency sampling to the filtered output signals, discrete letter is obtained
Number；
Segmental averaging module 503: for carrying out segmental averaging processing to the discrete signal, segmental averaging signal is obtained；
Judging module 504: for carrying out threshold judgement to the segmental averaging signal, transmission signal is obtained.
As shown in fig. 6, receiving at reception signal of the signal Jing Guo environment backscatter communication system provided by the present invention
Reason device processing gained transmission signal is obtained compared with without the obtained transmission Signal-to-Noise of reception signal processing means processes
To be obviously improved.It is consistently lower than 0dB without the obtained transmission Signal-to-Noise of reception signal processing means processes, and is passed through
Cross it is described reception signal processing means processes transmission Signal-to-Noise reach as high as 10dB.
As shown in fig. 7, receiving at reception signal of the signal through the environment backscatter communication system in the embodiment of the present invention
Manage the device processing gained transmission more not described obtained transmission signal error rate of reception signal processing means processes of signal significantly
It reduces.It is higher than 10 without transmission signal error rate obtained by the reception signal processing means processes-1；And pass through the reception signal
Processing unit processing gained transmission signal error rate reaches 10 in -2dB input signal-to-noise ratio-4。
The device of above-described embodiment for realizing method corresponding in previous embodiment there is corresponding method to implement
The beneficial effect of example, details are not described herein.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, it can in provided attached drawing
It is connect with showing or can not show with the well known power ground of integrated circuit (IC) chip and other components.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this has also contemplated following facts, i.e., about this
The details of the embodiment of a little block diagram arrangements be height depend on will implementing platform of the invention (that is, these details should
It is completely within the scope of the understanding of those skilled in the art).Elaborating that detail (for example, circuit) is of the invention to describe
In the case where exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case where or implement the present invention in the case that these details change.Therefore, these descriptions should be considered as explanation
Property rather than it is restrictive.
Although having been incorporated with specific embodiments of the present invention, invention has been described, according to retouching for front
It states, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, discussed embodiment can be used in other memory architectures (for example, dynamic ram (DRAM)).
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of method for processing received signal of environment backscatter communication system characterized by comprising
Bistable state potential well system is constructed, nonlinear filtering is carried out to the reception signal, obtains filtered output signals；
Low frequency sampling is carried out to the filtered output signals, obtains discrete signal；
Segmental averaging processing is carried out to the discrete signal, obtains segmental averaging signal；
Threshold judgement is carried out to the segmental averaging signal, obtains the transmission signal in the reception signal.
2. the method according to claim 1, wherein the building bistable state potential well system, believes the reception
Number carry out nonlinear filtering, obtaining filtered output signals includes:
Construct bistable state potential well system；
The dynamic system parameter for adjusting the bistable state potential well system makes input signal, the noise of the bistable state potential well system
Reach statistics resonance with the bistable state potential well system；
According to the dynamic system parameter of the bistable state potential well system, nonlinear filtering system is designed, the reception is believed
Number carry out nonlinear filtering, obtain the filtered output signals.
3. the method according to claim 1, wherein described adopt filtered output signals progress low frequency
Sample obtains discrete signal specifically:
Under the premise of being less than the signal of communication mark space of the environment backscatter communication system in the sampling interval, to the filter
Wave output signal carries out low frequency sampling, obtains the discrete signal.
4. the method according to claim 1, wherein it is described to the discrete signal carry out segmental averaging processing,
Obtain segmental averaging signal specifically:
Using the signal of communication mark space of the environment backscatter communication system as the time cycle, the discrete signal is carried out
Segmental averaging processing, obtains the segmental averaging signal.
5. the method according to claim 1, wherein it is described to the segmental averaging signal carry out threshold judgement,
Obtain transmission signal specifically:
Choose decision threshold be the discrete signal amplitude desired value, according to decision threshold to the segmental averaging signal into
Row judgement, obtains the transmission signal.
6. according to the method described in claim 2, it is characterized in that, the building bistable state potential well system specifically:
The bistable state potential well system can be described as:
V (x, t)=V (x)-A0x cos(Ωt)
Wherein, V indicates potential well system potential function, and x indicates system mode, A0Cos (Ω t) indicates that input external force, this external force are amplitude
It is A0, angular frequency is the external periodic force of Ω, and input external force is the signal of communication of the environment backscatter communication system；
The system mode x are as follows:
WhereinIndicate lagging phase, n (t) indicates that noise, the intensity D of noise n (t) are obtained by ∫ n (t) n (0)=2D δ (t)；
Choose bistable state potential well system are as follows:
Wherein a, b are the dynamic system parameter of the bistable state potential well system；
The potential well height of the bistable state potential well system is Δ V=a2/4b。
7. according to the method described in claim 6, it is characterized in that, the dynamical system of the adjustment bistable state potential well system
Parameter makes input signal, noise and the bistable state potential well system of the bistable state potential well system reach statistics resonance specific
Are as follows:
When the input external force and the noise act on the bistable state potential well system simultaneously, to bistable state potential well system
The dynamic system parameter a of system, b is adjusted, and within the scope of certain noise intensity, can observe the signal-to-noise ratio of output signal
It is obviously improved, i.e., input signal, noise and the bistable state potential well system of the described bistable state potential well system reach statistics
Resonance；
By the dynamic system parameter a, b of the maximum bistable state potential well system of the signal-to-noise ratio for making the output signal as institute
State the system parameter of nonlinear filtering system.
8. the method according to the description of claim 7 is characterized in that the dynamic according to the bistable state potential well system
System parameter designs nonlinear filtering system, carries out nonlinear filtering to the reception signal, obtains the filtered output signals
Specifically:
According to nonlinear filtering system described in the System Parameter Design of the nonlinear filtering system；
The system mode of the nonlinear filtering system can be stated are as follows:
WhereinIndicate that the input of the nonlinear filtering system, the input are that the environment reversely dissipates
Penetrate the signal of communication of communication system；
The output of the nonlinear filtering system is system mode x (t)；
The working principle of the nonlinear filtering system specifically:
System mode x (t) is carried out ax-bx is calculated3, it is added with the input, obtained result further makees integral operation
It obtains current time system mode x (t) output and is used as the filtered output signals.
9. a kind of reception signal processing of the environment backscatter communication system based on claim 1-8 any one the method
Device characterized by comprising
Nonlinear filtering module: for constructing bistable state potential well system, nonlinear filtering is carried out to the reception signal, is filtered
Wave output signal；
Low speed analog-to-digital conversion module: for carrying out low frequency sampling to the filtered output signals, discrete signal is obtained；
Segmental averaging module: for carrying out segmental averaging processing to the discrete signal, segmental averaging signal is obtained；
Judging module: for carrying out threshold judgement to the segmental averaging signal, transmission signal is obtained.
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| CN113438651A (en) * | 2021-06-17 | 2021-09-24 | 河南理工大学 | NOMA-based physical layer authentication method of environment backscatter communication system |
| CN114845339A (en) * | 2022-04-25 | 2022-08-02 | 河南垂天科技有限公司 | Environmental backscatter communication system |
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| CN114845339A (en) * | 2022-04-25 | 2022-08-02 | 河南垂天科技有限公司 | Environmental backscatter communication system |
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