CN106921415A - 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
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- 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 communication technical field, it is related to a kind of signal acceptance method for environment backscatter communication system.The method of the present invention mainly sends including signal：Signal source is made up of radio frequency source and multiple labels；Wherein label is powered by radio frequency source, and the signal that label sends comes from what the signal of radio frequency source was modulated as carrier wave, and label includes backscatter antenna；Signal is received：The signal s of the radio frequency source and back-scattered signal c of multiple labels is received using joint receiverk, subscript k is the numbering of label；Signal detection：The signal that joint receiver is received 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 waves in environment.
Description
Technical field
The invention belongs to communication technical field, it is related to a kind of receiving side signal for environment backscatter communication system
Method.
Background technology
Traditional backscatter communication system, such as radio frequency identification (RFID) system, are produced by reader (Reader)
And send radiofrequency sinusoidal carrier wave energy is provided and label information is carried to the label (Tag) that closes on and return to reader.Label electricity
Road is generally straightforward and is passive, therefore its disposal ability is limited.As shown in figure 1, RFID reader sends sinusoidal carrier
To label, the signal part that label is received meets the normal work of tag circuit for collection of energy, and another part is used
In backscattering, with the information transfer of label to reader.Because reader needs the special radiofrequency sinusoidal carrier wave of generation, this
Planting traditional backscatter communication system needs consumption energy higher, and efficiency is relatively low.
The content of the invention
In order to solve the problems, such as the consumption high of conventional counter scatter communication system, low-energy-efficiency, the present invention proposes a kind of utilization
Signal in surrounding environment as carrier wave environment backscatter communication system.Because present radio communication is widely used
OFDM is modulated, 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 that multiple labels are based in environment
Ofdm signal realizes the scene of backscatter communication.
The technical scheme is that：
A kind of signal acceptance method for environment backscatter communication system, the environment backscatter communication system is
By the use of the signal in surrounding environment as the backscatter communication system of carrier wave, the signal source of the backscatter communication system includes
Radio frequency source and multiple labels, it is characterised in that comprise the following steps：
A. signal sends：Signal source is made up 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 is received：The signal s of the radio frequency source and back-scattered signal c of multiple labels is received using joint receiverk,
Subscript k is the numbering of label；
C. signal detection：The signal that joint receiver is received is detected.
Assuming that one has K label, then the signal that joint receiver is received in step b is equation below 1：
Wherein, y refers to the signal that joint receiver is received, and s refers to radio-frequency source signal, ckIt is that k-th label will
The signal of transmission, the sub-carrier number of OFDM is N number of, refers to the power of radio-frequency source signal, and W refers to N-dimensional Fourier transformation square
Gust, element isAlso, α is the reflectance factor of label, is k-th label to connection
The channel response of receiver is closed, it is σ that u (n) obeys power2The distribution of Cyclic Symmetry multiple Gauss, i.e. u (n) and signal s and independence；
The signal for receiving is detected using maximum likelihood algorithm：
Detected value is obtained by equation below 2：
Wherein It is the set of radio-frequency source signal s (n) all elements, if s
N () is the signal under the modulation of quaternary phase-shift keying (PSK), then It is label signal ck
The set of all elements.
The signal for receiving is detected using Interference Cancellation detection algorithm：
C1. joint receiver detects radio-frequency source signal s (n)：
Label signal is treated as into interference signal, radio-frequency source signal s (n) is obtained by equation below 3：
It is the set of radio-frequency source signal s (n) all elements；
C2. joint receiver detects label signal ck：
Receiving terminal docks the collection of letters number after signal is received and carries out FFT, and public affairs are expressed as after receiving signal transacting
Formula 4：
Bit in one OFDM symbol cycle can be described as：
Direct link interference is subtracted from treated reception signal z (n), M signal v (n) equation below 5 is obtained：
Formula 5 can be described as equation below 6：
Wherein,
Joint receiver processes M signal using minimum mean square error detector, and the decoding matrix of least mean-square error is
Equation below 7：
Wherein, Ps=1；
By that after least mean-square error, can obtain：
Wherein K label signal can be estimated by equation below 8：
WhereinIt is 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 for estimating can help estimate as channel information
A more accurate radio-frequency source signal is counted out, s (n) is made, radio-frequency source signal is estimated by equation below 10：
Beneficial effects of the present invention are, compared with conventional counter scatter communication system, the invention provides OFDM in environment
The signal acceptance method of the multi-tag backscatter communication of carrier wave.
Brief description of the drawings
Fig. 1 shows the system block diagram of conventional radio frequency identifying system；
Fig. 2 shows the system block diagram of legacy communications system of the present invention and environment backscatter communication system；
Fig. 3 shows the system model of legacy communications system of the present invention and environment backscatter communication system；
Fig. 4 shows that the present invention detects the flow chart of radio-frequency source signal and label signal by Interference Cancellation detection algorithm；
Fig. 5 shows that receiver detection signal scheme proposed by the present invention detects the bit error rate of radio-frequency source signal；
Fig. 6 shows that receiver detection signal scheme proposed by the present invention detects the bit error rate of the signal of label 1；
Fig. 7 shows that receiver detection signal scheme proposed by the present invention detects the bit error rate of the signal of label 2.
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme is described in detail：
Fig. 2 illustrates system block diagram of the invention, there is two communication systems for coexisting in such a system：Traditional communication system
System, is made up of radio frequency source, receiver；Environment backscatter communication system, the multiple labels powered by radio frequency source and traditional communication
The shared joint receiver composition of system.The present invention focuses on two and the system deposited, and the signal that two systems are sent is in connection
Splice grafting is received machine examination and is measured.Wherein label to the signal that joint receiver is transmitted is entered as carrier wave with the signal for coming from radio frequency source
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 for coming from signal in environment.Passed to reader to pass through backscattered modulation
Send information bit, label is adjusted by the switch for switching antenna impedance and then the amplitude and/or phase that change back-scattered signal
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 ofdm signal that the multiple labels of present invention concern are based in environment is realized
Backscatter communication.h0N () refers to the channel response of L paths between radio frequency source and joint receiver, hkN () refers to radio frequency
The channel response of L paths, g between source and k-th labelkRefer to the letter of individual paths between k-th label and joint receiver
Road is responded, and K label is considered 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 the signal that joint receiver is received, and s refers to radio-frequency source signal, and s includes N number of bit, represents one
OFDM symbol, s=[s (0), s (1) ..., s (N-1)]T, ckIt is k-th label signal to be sent, p refers to the power of radio-frequency source signal,
α is the reflectance factor of label.W refers to N-dimensional Fourier transform matrix, and element isAnd
And,.It is σ that u (n) obeys power2Cyclic Symmetry multiple Gauss (CSCG) distribution, i.e. u (n) and signal s and independence.
In the present invention, it is considered to which the cycle of label signal is equal to an OFDM symbol cycle, so in an OFDM symbol
In cycle, label signal numerical value keeps constant.Therefore the signal that joint receiver is received is expressed as,
Receiving terminal can dock the collection of letters number after signal is received and carry out FFT, and receiving signal can be expressed as：
Bit in one OFDM symbol cycle can be described as：
Fig. 4 represents that joint receiver of the present invention detects that radio-frequency source signal and K label are believed by Interference Cancellation detection algorithm
Number flow chart.First, joint receiver detects radio-frequency source signal s (n).Label signal is carried out one as interference in receiving terminal
Step is balanced, can obtain：
Then, joint receiver detection label signal ck.Estimating radio-frequency source signalAfterwards, the present invention believes from reception
Direct link interference is subtracted in number z (n), following M signal is obtained,
Wherein
C=[c1,c2,…,cK]H。
When joint receiver processes M signal using minimum mean square error detector, the decoding matrix of least mean-square error
Can be expressed as,
Wherein, by that after least mean-square error, can obtain
Wherein K label signal can be estimated by following expression formula,
Finally, radio-frequency source signal s (n) is reevaluated.The reception signal of joint receiver can also be written as,
Wherein, estimated label signal in second step, the label signal for estimating can help to estimate one it is more accurate
Radio-frequency source signal, make s (n), ofdm signal is estimated by following expression formula,
Joint receiver detection radio-frequency source signal and the label signal of present invention design 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 per paths is 1/L, the channel response g from k-th 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 × 104Individual channel estimates this side
The bit error rate performance of case.
Fig. 5 represents that receiver detection signal scheme proposed by the present invention detects the bit error rate of radio-frequency source signal, 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 less than the bit error rate of pure ofdm system, because the bit error rate of backscatter system is very low, can be by backscattering system
System regards multipath as.So as to increased the channel information of system.
Fig. 6,7 represent receiver detection signal scheme detection label 1 proposed by the present invention, the bit error rate of 2 signals, can see
Go out the bit error rate obtained based on interference cancellation algorithm more than the bit error rate that maximum likelihood detector is obtained, but due to backscattering
The cycle of signal is much larger than OFDM bit periods, therefore has spread spectrum effect, so that the bit error rate of interference cancellation algorithm can be by
Receive.
Claims (3)
1. a kind of signal acceptance method for environment backscatter communication system, the environment backscatter communication system is profit
With the signal in surrounding environment as carrier wave backscatter communication system, the signal source of the backscatter communication system includes penetrating
Frequency source and multiple labels, it is characterised in that comprise the following steps：
A. signal sends：Signal source is made up of radio frequency source and multiple labels；Wherein label is powered by radio frequency source, and label sends
Signal come from what the signal of radio frequency source was modulated as carrier wave, label includes backscatter antenna；
B. signal is received：The signal s of the radio frequency source and back-scattered signal c of multiple labels is received using joint receiverk, subscript k
It is the numbering of label；
C. signal detection：The signal that joint receiver is received is detected.
2. a kind of signal acceptance method for backscatter communication system according to claim 1, it is characterised in that institute
The specific method for stating step c is：
Assuming that one has K label, then the signal that joint receiver is received in step b is equation below 1：
Wherein, y refers to the signal that joint receiver is received, and s refers to radio-frequency source signal, ckIt is that k-th label to be sent
Signal, the sub-carrier number of OFDM is N number of, and p refers to the power of radio-frequency source signal, and W refers to N-dimensional Fourier transform matrix, unit
Element isAnd Λ0=diag (H0,0,H0,1,…,H0,N-1),α is the reflectance factor of label, gkIt is channel of k-th label to joint receiver
Response, it is σ that u (n) obeys power2Cyclic Symmetry multiple Gauss distribution, i.e.,U (n) and signal s and ckSolely
It is vertical；
The signal for receiving is detected using maximum likelihood algorithm：
Detected value is obtained by equation below 2：
Wherein It is the set of radio-frequency source signal s (n) all elements, if s (n) is
Signal under the modulation of quaternary phase-shift keying (PSK), then For label is believed
Number ckThe set of all elements.
3. a kind of signal acceptance method for backscatter communication system according to claim 1, it is characterised in that institute
The specific method for stating step c is：
Assuming that the signal that joint receiver is received in step b is equation below 1：
Wherein, y refers to the signal that joint receiver is received, and s refers to radio-frequency source signal, ckIt is that k-th label to be sent
Signal, the sub-carrier number of OFDM is N number of, and p refers to the power of radio-frequency source signal, and W refers to N-dimensional Fourier transform matrix, unit
Element isAnd Λ0=diag (H0,0,H0,1,…,H0,N-1),α is the reflectance factor of label, gkIt is channel of k-th label to joint receiver
Response, it is σ that u (n) obeys power2Cyclic Symmetry multiple Gauss distribution, i.e.,U (n) and signal s and ckSolely
It is vertical；
C1. joint receiver detects radio-frequency source signal s (n)：
Label signal is treated as into interference signal, radio-frequency source signal s (n) is obtained by equation below 3：
It is the set of radio-frequency source signal s (n) all elements；
C2. joint receiver detects label signal ck：
Receiving terminal docks the collection of letters number after signal is received and carries out FFT, and formula 4 is expressed as after receiving signal transacting：
Direct link interference is subtracted from treated reception signal z (n), M signal v (n) equation below 5 is obtained：
Formula 5 can be described as equation below 6：
Wherein,
Joint receiver processes 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；
By that after least mean-square error, can obtain：
Wherein K label signal can be estimated by equation below 8：
WhereinIt is 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：
WhereinLabel signal is estimated in step c2, the label signal for estimating can be with
Help estimate a more accurate radio-frequency source signal as channel information, make
Radio-frequency source signal is estimated by equation below 10：
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| CN107544054A (en) * | 2017-08-15 | 2018-01-05 | 西京学院 | A kind of indoor orientation method and device based on environment backscattering |
| CN107861100A (en) * | 2017-11-10 | 2018-03-30 | 西京学院 | A kind of indoor orientation method based on three-dimensional wave beam |
| CN109412992A (en) * | 2018-11-13 | 2019-03-01 | 上海交通大学 | Backscatter system and method based on OFDMA technology |
| CN109451591A (en) * | 2018-12-27 | 2019-03-08 | 电子科技大学 | Merge Cellular Networks-Internet of Things cogeneration system transmission method |
| CN109547039A (en) * | 2019-01-16 | 2019-03-29 | 西安交通大学 | A kind of intelligent environment backscatter communication method |
| CN109560826A (en) * | 2018-12-27 | 2019-04-02 | 电子科技大学 | Cellular Networks-Internet of Things cogeneration system |
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| CN107544054A (en) * | 2017-08-15 | 2018-01-05 | 西京学院 | A kind of indoor orientation method and device based on environment backscattering |
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| CN107861100B (en) * | 2017-11-10 | 2021-09-28 | 西京学院 | Indoor positioning method based on three-dimensional wave beam |
| CN111742527A (en) * | 2017-12-22 | 2020-10-02 | 瑞典爱立信有限公司 | System, network node, wireless device, method and computer program for low power backscatter operation |
| CN109412992A (en) * | 2018-11-13 | 2019-03-01 | 上海交通大学 | Backscatter system and method based on OFDMA technology |
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| CN109831786A (en) * | 2019-01-29 | 2019-05-31 | 华中科技大学 | A kind of wireless communications method and system based on backscattering aerial array |
| CN110177064A (en) * | 2019-06-17 | 2019-08-27 | 电子科技大学 | One kind being based on environment backscatter communication system low complex degree receiver design method |
| CN110635826A (en) * | 2019-09-09 | 2019-12-31 | 华中科技大学 | Communication method and system for multi-antenna backscatter tag |
| CN110635826B (en) * | 2019-09-09 | 2021-04-20 | 华中科技大学 | Communication method and system for multi-antenna backscatter tag |
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| 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 |
| CN116232443A (en) * | 2023-05-09 | 2023-06-06 | 中国科学技术大学 | Environment WiFi backscattering system and method based on single commercial AP receiver |
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