CN106921415B - A kind of signal acceptance method for environment backscatter communication system - Google Patents
A kind of signal acceptance method for environment backscatter communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
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- G—PHYSICS
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
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Abstract
The invention belongs to fields of communication technology, are related to a kind of signal acceptance method for environment backscatter communication system.Method of the invention mainly includes that signal is sent: signal source is made of radio frequency source and multiple labels；Wherein label is to be powered by radio frequency source, and the signal that label is sent comes from what the signal of radio frequency source was modulated as carrier wave, and label includes backscatter antenna；Signal receives: the signal s of radio frequency source and the back-scattered signal c of multiple labels are received using joint receiverk, subscript k is the number of label；Signal detection: the signal that joint receiver receives is detected.Beneficial effects of the present invention are, compared with conventional counter scatter communication system, the present invention improves the signal acceptance method of the multi-tag backscatter communication of OFDM carrier wave in environment.
Description
Technical field
The invention belongs to fields of communication technology, are related to a kind of receiving side signal for environment backscatter communication system
Method.
Background technique
Traditional backscatter communication system such as radio frequency identification (RFID) system is generated by reader (Reader)
And it sends radiofrequency sinusoidal carrier wave energy is provided and carries label information to the label (Tag) that closes on and return to reader.Label electricity
Road is generally straightforward and is passive, therefore its processing capacity is limited.As shown in Figure 1, RFID reader sends sinusoidal carrier
To label, signal a part that label receives meets the normal work of tag circuit for collection of energy, and another part is used
In backscattering, the information of label is transferred to reader.Since reader needs to generate dedicated radiofrequency sinusoidal carrier wave, this
The traditional backscatter communication system of kind needs to consume higher energy, and efficiency is lower.
Summary of the invention
In order to solve the problems, such as the consumption of conventional counter scatter communication system height, low-energy-efficiency, the invention proposes a kind of utilizations
Environment backscatter communication system of the signal as carrier wave in ambient enviroment.Since present wireless communication widely uses
OFDM modulation, such as WiFi and DVB, so the present invention realizes environment backscattering using the ofdm signal in environment as carrier wave
Communication, and the receiver design side for realizing backscatter communication is proposed, the present invention considers multiple labels based in environment
The scene of ofdm signal realization backscatter communication.
The technical scheme is that
A kind of signal acceptance method for environment backscatter communication system, the environment backscatter communication system are
Using the signal in ambient enviroment as the backscatter communication system of carrier wave, the signal source of the backscatter communication system includes
Radio frequency source and multiple labels, which comprises the following steps:
A. signal is sent: signal source is made of radio frequency source and multiple labels；Wherein label is powered by radio frequency source, and label
What the signal that the signal of transmission comes from radio frequency source was modulated as carrier wave, label includes backscatter antenna；
B. signal receives: the signal s of radio frequency source and the back-scattered signal c of multiple labels are received using joint receiverk,
Subscript k is the number of label；
C. signal detection: the signal that joint receiver receives is detected.
Assuming that a shared K label, then the signal that joint receiver receives in step b is following formula 1:
Wherein, y refers to that the signal that joint receiver receives, s refer to radio-frequency source signal, ckIt is that k-th of label is wanted
The signal of transmission, the sub-carrier number of OFDM be it is N number of, refer to that the power of radio-frequency source signal, W refer to N-dimensional Fourier transformation square
Battle array, element areAlso, α is the reflection coefficient of label, is k-th of label to connection
The channel response of receiver is closed, it is σ that u (n), which obeys power,2The distribution of Cyclic Symmetry multiple Gauss, that is, u (n) and signal s and independence；
The signal received is detected using maximum likelihood algorithm:
Detected value is obtained by following formula 2:
Wherein For the set of radio-frequency source signal s (n) all elements, if s
It (n) is the signal under the modulation of quaternary phase-shift keying (PSK), then For label signal
ckThe set of all elements.
The signal received is detected using Interference Cancellation detection algorithm:
C1. joint receiver detection radio-frequency source signal s (n):
Label signal is treated as into interference signal, radio-frequency source signal s (n) is obtained by following formula 3:
For the set of radio-frequency source signal s (n) all elements；
C2. joint receiver detects label signal ck:
Receiving end, to signal progress FFT transform is received, is expressed as public affairs after receiving signal processing after receiving signal
Formula 4:
Bit in one OFDM symbol period can be described as:
Direct link interference is subtracted from treated reception signal z (n), obtains the following formula 5 of M signal v (n):
Formula 5 can be described as following formula 6:
Wherein,
Joint receiver handles M signal using minimum mean square error detector, and the decoding matrix of least mean-square error is
Following formula 7:
Wherein, Ps=1；
After least mean-square error, it can obtain:
Wherein K label signal can be estimated by following formula 8:
WhereinFor the set of label signal c (n) all elements；
C3. radio-frequency source signal s (n) is reevaluated:
The reception signal of joint receiver is expressed as formula 9:
Wherein, label signal has been estimated in step c2, the label signal estimated can be estimated as channel information help
A more accurate radio-frequency source signal is counted out, s (n) is enabled, radio-frequency source signal is estimated by following formula 10:
Beneficial effects of the present invention are, compared with conventional counter scatter communication system, the present invention provides OFDM in environment
The signal acceptance method of the multi-tag backscatter communication of carrier wave.
Detailed description of the invention
Fig. 1 shows the system block diagram of conventional radio frequency identifying system；
Fig. 2 shows the system block diagrams of legacy communications system of the present invention and environment backscatter communication system；
Fig. 3 shows the system model of legacy communications system and environment backscatter communication system of the present invention；
Fig. 4 shows the flow chart that the present invention detects radio-frequency source signal and label signal by Interference Cancellation detection algorithm；
Fig. 5 shows the bit error rate of reception machine testing signaling plan detection radio-frequency source signal proposed by the present invention；
Fig. 6 shows the bit error rate of reception machine testing signaling plan detection 1 signal of label proposed by the present invention；
Fig. 7 shows the bit error rate of reception machine testing signaling plan detection 2 signal of label proposed by the present invention.
Specific embodiment
With reference to the accompanying drawing, the technical schemes of the invention are described in detail:
Fig. 2 illustrates system block diagram of the invention, and there are two the communication systems coexisted in such a system: traditional communication system
System, is made of radio frequency source, receiver；Environment backscatter communication system, by the multiple labels and traditional communication of radio frequency source power supply
The shared joint receiver composition of system.The system that the present invention focuses on two and deposits is joining the signal that two systems are sent
Splice grafting is received machine examination and is measured.Wherein label to the signal that joint receiver transmits be use signal from radio frequency source as carrier wave into
Row modulation, label includes a backscatter antenna, and antenna is connected to the switch and RF energy collection module of load impedance,
RF energy collection module can collect the energy of the signal in environment.In order to be passed by backscattered modulation to reader
Information bit is sent, label changes amplitude and/or the phase of back-scattered signal by the switch of switching antenna impedance to adjust
System receives carrier signal, and last back-scattered signal is received by joint receiver and decoded.
Fig. 3 illustrates system model of the invention, and the present invention is paid close attention to multiple labels and realized based on the ofdm signal in environment
Backscatter communication.h0(n) channel response of L paths between radio frequency source and joint receiver, h are referred tok(n) radio frequency is referred to
The channel response of L paths, g between source and k-th of labelkRefer to the letter of individual paths between k-th of label and joint receiver
Road response, considers K label in the present invention.
Joint receiver receives the signal of radio frequency source and the signal of multiple tag backscatters, receives signal and is removing circulation
It is after prefix,
Wherein, y refers to that the signal that joint receiver receives, s refer to radio-frequency source signal, and s includes N number of bit, table
Show an OFDM symbol, s=[s (0), s (1) ..., s (N-1)]T, ckIt is k-th of label signal to be sent, p refers to radio frequency
The power of source signal, α are the reflection coefficients of label.W refers to N-dimensional Fourier transform matrix, and element isAlso,.It is σ that u (n), which obeys power,2Cyclic Symmetry multiple Gauss (CSCG) distribution,
That is, u (n) and signal s and independence.
In the present invention, consider that the period of label signal is equal to an OFDM symbol period, so in an OFDM symbol
In period, label signal numerical value is remained unchanged.Therefore the signal that joint receiver receives is expressed as,
Receiving end can carry out FFT transform to signal is received after receiving signal, and receiving signal can indicate are as follows:
Bit in one OFDM symbol period can be described as:
Fig. 4 indicates that joint receiver of the present invention detects radio-frequency source signal and K label letter by Interference Cancellation detection algorithm
Number flow chart.Firstly, joint receiver detection radio-frequency source signal s (n).Label signal is carried out one as interference in receiving end
Step is balanced, can obtain:
Then, joint receiver detects label signal ck.Estimating radio-frequency source signalAfterwards, the present invention believes from reception
Direct link interference is subtracted in number z (n), obtains following M signal,
Wherein
C=[c1,c2,…,cK]H。
When joint receiver is using minimum mean square error detector processing M signal, the decoding matrix of least mean-square error
It can be expressed as,
Wherein, it after least mean-square error, can obtain
Wherein K label signal can be estimated by following expression formula,
Finally, reevaluating radio-frequency source signal s (n).The reception signal of joint receiver also can be written as,
Wherein, estimated label signal in second step, the label signal estimated can help to estimate one it is more acurrate
Radio-frequency source signal, enable s (n), ofdm signal estimated by following expression formula,
The joint receiver detection radio-frequency source signal and label signal that the present invention designs are verified below by simulation result
Performance.It is assumed that number of sub carrier wave N=64, number of path L=8, are independent rayleigh fading channel from the channel of radio frequency source,
And the channel average power of each path is 1/L, the channel response g from k-th of label to joint receiverk=0.1, reversely
Scattering coefficient α=0.5, noise variance σ2=1.Radio-frequency source signal is modulated using quaternary phase-shift keying (PSK) (QPSK) modulation system,
Label signal is modulated using binary phase shift keying (BPSK) modulation system, and the present invention uses 2 × 104A channel estimates this side
The bit error rate performance of case.
Fig. 5 indicates the bit error rate of reception machine testing signaling plan detection radio-frequency source signal proposed by the present invention, it can be seen that
Using the detection mode of Interference Cancellation, the performance of minimum mean square error detector has approached the performance of maximum likelihood detector,
And it is less than the bit error rate of pure ofdm system, this is because the bit error rate of backscatter system is very low, it can be by backscattering system
System regards multipath as.To increase the channel information of system.
Fig. 6,7 indicate the bit error rate proposed by the present invention for receiving machine testing signaling plan detection label 1,2 signals, can see
The bit error rate obtained out based on interference cancellation algorithm is greater than the bit error rate that maximum likelihood detector obtains, but due to backscattering
The period of signal is much larger than OFDM bit period, therefore has spread spectrum effect, so that the bit error rate of interference cancellation algorithm can be by
Receive.
Claims (1)
1. a kind of signal acceptance method for environment backscatter communication system, the environment backscatter communication system is benefit
Use the signal in ambient enviroment as the backscatter communication system of carrier wave, the signal source of the backscatter communication system includes penetrating
Frequency source and multiple labels, which comprises the following steps:
A. signal is sent: signal source is made of radio frequency source and multiple labels；Wherein label is to be powered by radio frequency source, and label is sent
Signal come from what the signal of radio frequency source was modulated as carrier wave, label includes backscatter antenna；
B. signal receives: the signal s of radio frequency source and the back-scattered signal c of multiple labels are received using joint receiverk, subscript k
For the number of label；
C. signal detection: detecting the signal that joint receiver receives, method particularly includes:
Assuming that the signal that joint receiver receives in step b is following formula 1:
Wherein, y refers to that the signal that joint receiver receives, s refer to radio-frequency source signal, ckIt is that k-th of label to be sent
Signal, the sub-carrier number of OFDM be it is N number of, p refers to that the power of radio-frequency source signal, W refer to N-dimensional Fourier transform matrix, member
Element is And Λ0=diag
(H0,0,H0,1,…,H0,N-1),α is the reflection coefficient of label, h0(n) it refers to
The channel response of L paths, h between radio frequency source and joint receiverk(n) L paths between radio frequency source and k-th of label are referred to
Channel response, gkIt is channel response of k-th of label to joint receiver, Λk=diag (Hk,0,Hk,1,…,Hk,N-1), k=
It is σ that 1 ... K, u, which obey power,2Cyclic Symmetry multiple Gauss distribution, i.e.,U and signal s and ckIt is independent；
Receiving end, to signal progress FFT transform is received, is expressed as formula 4 after receiving signal processing after receiving signal:
C1. joint receiver detects radio-frequency source signal s:
Label signal is treated as into interference signal, radio-frequency source signal s is obtained by following formula 3:
For the set of radio-frequency source signal s all elements；
C2. joint receiver detects label signal ck:
Direct link interference is subtracted from treated reception signal z, obtains the following formula 5 of M signal v:
Formula 5 can be described as following formula 6:
Wherein,
Joint receiver handles M signal using minimum mean square error detector, and the decoding matrix of least mean-square error is as follows
Formula 7:
Wherein, ps=1；
After least mean-square error, it can obtain:
Wherein K label signal can be estimated by following formula 8:
WhereinFor the set of label signal c all elements；
C3. radio-frequency source signal s is reevaluated:
The reception signal of joint receiver is expressed as formula 9:
WhereinLabel signal is estimated in step c2, the label signal estimated can
To estimate a more accurate radio-frequency source signal as channel information helpIt enablesRadio-frequency source signal is estimated by following formula 10:
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| US20200313939A1 (en) * | 2017-12-22 | 2020-10-01 | Telefonaktiebolaget Lm Ericsson (Publ) | System, network node, wireless device, method and computer program for low-power backscattering operation |
| CN109412992B (en) * | 2018-11-13 | 2020-07-14 | 上海交通大学 | Backscattering system and method based on orthogonal frequency division multiple access technology |
| CN109560826B (en) * | 2018-12-27 | 2019-11-01 | 电子科技大学 | Cellular Networks-Internet of Things cogeneration system |
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| CN109547039B (en) * | 2019-01-16 | 2020-10-27 | 西安交通大学 | Intelligent environment backscattering communication method |
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| CN110784248B (en) * | 2019-11-01 | 2020-11-24 | 电子科技大学 | Frequency control array environment backscattering communication self-adaptive detection method based on double thresholds |
| CN111682958B (en) * | 2020-05-06 | 2023-04-07 | 太原理工大学 | Environmental backscattering signal detection method based on cluster analysis |
| CN111641577B (en) * | 2020-05-08 | 2021-12-24 | 上海交通大学 | Backscattering system based on orthogonal frequency division multiple access technology |
| CN111654460B (en) * | 2020-06-01 | 2021-05-14 | 电子科技大学 | Symbiotic wireless communication system |
| CN112954792B (en) * | 2021-02-05 | 2022-03-08 | 电子科技大学 | Multi-reflection device joint positioning and communication method based on environment backscattering |
| CN113055328B (en) * | 2021-02-08 | 2022-09-09 | 西安电子科技大学 | BPSK modulation circuit based on low-power backscattering amplification label and method thereof |
| CN113194036B (en) * | 2021-03-31 | 2022-12-09 | 西安交通大学 | Routing method, system, equipment and readable storage medium for multi-label network |
| CN113891424B (en) * | 2021-10-13 | 2023-08-18 | 东莞职业技术学院 | Method and equipment for assisting backscatter communication based on Internet of things node |
| WO2023236144A1 (en) * | 2022-06-09 | 2023-12-14 | Oppo广东移动通信有限公司 | Wireless communication method and device |
| CN116232443B (en) * | 2023-05-09 | 2023-08-29 | 中国科学技术大学 | Environment WiFi backscattering system and method based on single commercial AP receiver |
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