CN105187069B - It is a kind of to use differential transfer and the method for Manchester's code enhancing backscattering - Google Patents
It is a kind of to use differential transfer and the method for Manchester's code enhancing backscattering Download PDFInfo
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- CN105187069B CN105187069B CN201510581620.3A CN201510581620A CN105187069B CN 105187069 B CN105187069 B CN 105187069B CN 201510581620 A CN201510581620 A CN 201510581620A CN 105187069 B CN105187069 B CN 105187069B
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Abstract
It is specially a kind of using differential transfer and the method for Manchester's code enhancing backscattering the present invention relates to environment backscatter methods, include the following steps：Build transmitter and receiver；Transmitter and receiver storage energy during impedance matching；Signal is subjected to Manchester's code when impedance mismatch and signal is sent by transmitter, receiver receives signal；Receiver will receive signal and carry out additive operation by envelope detector and then by analog subtracter, balance out the interference of TV signals；The amplitude of the signal obtained after additive operation is compared, and the information of transmission is decoded by Manchester's code rule through threshold comparator with threshold value.Two methods of differential transfer mode and Manchester's code are combined by the present invention, the performance of environment backscattering can be enhanced to greatest extent, it can effectively increase transmission range using Manchester code, there is inhibiting effect to the interference in channel using differential transfer mode, reduce the bit error rate of environment backscattering.
Description
Technical field
It is specially a kind of anti-using differential transfer and Manchester's code enhancing the present invention relates to environment backscatter methods
To the method for scattering.
Background technology
Invisible calculating is formally proposed from mark Wei Saier（Invisible Computing）Concept start, Ren Menyi
It is straight to be dedicated to allowing object that realize extensive interconnection with object, by the respondent behavior of complete wisdom, realize the depth integration of people and object,
And a series of research and development is unfolded thus, so as to provide better service experience for the mankind.More than 20 years is in the past, although
Information physical merges this theory（Cyber-Physical System, CPS）It is widely recognized, the object being connected towards all things on earth
Networking industries are also unanimously had an optimistic view of, but the extensive Internet of Things application of explosion type do not occur, it has to say Internet of things node
Energy problem is one of those important bottleneck.
The cost that energy problem results in Internet of Things application first increases substantially.In fact, many ecological environment monitoring
System, Geological Disaster Warning System etc. all suffer from one it is common the problem of, that is, be difficult to maintain long-play, directly result in
The scalability of this kind of resolving ideas and declining to a great extent for practicability.Naturally, people just expect, if node itself is not
Outfit is not to rely primarily on the power-supply device power supply of itself, but it is supported to calculate, perceive by obtaining energy from environment
It is all right with communication and networking.Early in the radio frequency identification for just favorably using electromagnetic energy during the Second World War（Radio Frequency
IDentification, RFID）Passive tag, this is extension of the Radar Technology at civilian aspect.2005, Intel Seattle
Researcher proposes label combining wireless charging technique, and energy is obtained from the continuous wave of radio-frequency identification reader, has developed wireless
Identification and aware platform（Wireless Identification and Sensing Platform, WISP）New technology.2013
Year, Washington, DC university designs environment backscattering prototype for the first time, main operation principle be can from TV signals,
Energy is obtained in the signals such as WIFI signal, and is communicated by the backscattering signal, whether modulated process is by realizing
Impedance matching is realized, if impedance matching, the energy transmitted is largely absorbed, and the energy that recipient receives is less, if resistance
Anti- mismatch, for sender by signal backscattering, the energy that recipient receives is more, can by comparing the amount of receiving terminal
To realize the transmission of signal and decoding.
Environment backscattering can directly obtain energy in existing environment, and save conventional counter scattering RFID
In reader, realize the communication between label, but since the technology is at the early-stage, thus accessible communication distance compared with
It is short, and the bit error rate is higher in transmission process.
Invention content
The present invention carries to solve the problems, such as that environment backscatter communication distance is shorter higher with the bit error rate in transmission process
Differential transfer and the method for Manchester's code enhancing backscattering are used for a kind of.
The present invention adopts the following technical scheme that realization：It is a kind of anti-using differential transfer and Manchester's code enhancing
To the method for scattering, include the following steps：
Environment backscattering device is built, transmitter and receiver including being integrated with power management module in it will be sent out
The antenna on machine is sent to be installed as two orthogonal poliarizing antennas of polarization direction, the antenna on receiver is also installed as two polarization sides
To orthogonal poliarizing antenna, and polarization direction and the polarization direction of transmitter poliarizing antenna are consistent, and transmitter is in original knot
Increase a phase inverter on the basis of structure, receiver includes two envelope detectors, an analog subtracter and a threshold value comparison
Device；
Transmitter respectively first adjusts impedance matching condition with receiver, can be obtained from TV signals in the case of impedance matching
Energy is taken, is stored in transmitter in the capacitor of power management module in receiver, energy is provided to realize to communicate；
Transmitter respectively adjusts impedance matching condition again with receiver, and when impedance mismatch, transmitter will be to be transmitted
Information carries out Manchester's code, then by phase inverter, and information is overturn, and forms two-way with same frequency and reversed-phase signal, then by two
It, can be into the transmission of row information, into communication shape by backscattering TV signals in the with same frequency and reversed-phase signal modulation to TV signals of road
State；Communication distance can effectively be increased, and since Manchester's code carries synchronous letter by using Manchester's code
Breath reduces the step of synchronization process is done in the needs docking collection of letters number, saves energy；
Two-way with same frequency and reversed-phase signal is transmitted respectively by the opposite poliarizing antenna of two polarization directions of transmitter, receiver
Two antennas receive the signal of corresponding direction respectively, transmitter and receiver use orthogonal two poliarizing antennas of polarization direction
It can be interfered in transmission process with the signal of frequency to avoid two-way；
Two poliarizing antennas of receiver not only receive the two-way with same frequency and reversed-phase signal of transmission, can equally receive with frequency
TV signals, two paths of signals by envelope detector and then by analog subtracter is subjected to additive operation, balances out TV signals
Interference, what it is due to transmission is differential signal, by additive operation, can obtain double amplitude, facilitate decoding, passed using difference
It is defeated to eliminate interference using less analog device with additive operation, reduce error code in the case where ensureing equipment volume
Rate；
The amplitude of the signal obtained after additive operation through threshold comparator with threshold value is compared, and is compiled by Manchester
Code rule decodes the information of transmission.
Two methods of differential transfer mode and Manchester's code are combined by the present invention, can enhance ring to greatest extent
The performance of border backscattering can effectively be increased environment backscatter transmission distance using Manchester code, be passed using difference
Defeated mode has good inhibiting effect to the interference in channel, and this also reduces the bit error rates of environment backscattering.
Description of the drawings
Fig. 1 is the schematic diagram of differential transfer.
Fig. 2 is the design frame chart of differential transfer.
Fig. 3 is the oscillogram of Manchester's code.
Alice and Bod is two equipment for not needing to installation battery in Fig. 1 and Fig. 2, and two equipment use double antenna,
And the polarization direction of two antennas is orthogonal, and a signal inverter is first passed around in transmitting terminal signal to be transmitted,
Then it is transmitted on two antennas respectively, at receiving terminal end, subtraction is done to two paths of signals, then passes through threshold value comparison
Circuit decoded signal.
Specific embodiment
A kind of method for being enhanced backscattering using differential transfer and Manchester's code, is included the following steps：
Environment backscattering device is built, transmitter and receiver including being integrated with power management module in it will be sent out
The antenna on machine is sent to be installed as two orthogonal poliarizing antennas of polarization direction, the antenna on receiver is also installed as two polarization sides
To orthogonal poliarizing antenna, and polarization direction and the polarization direction of transmitter poliarizing antenna are consistent, and transmitter is in original base
Increase a phase inverter on plinth, receiver includes two envelope detectors, an analog subtracter and a threshold comparator；
Transmitter respectively first adjusts impedance matching condition with receiver, can be obtained from TV signals in the case of impedance matching
Energy is taken, is stored in transmitter in the capacitor of power management module in receiver, energy is provided to realize to communicate；
Transmitter respectively adjusts impedance matching condition again with receiver, and when impedance mismatch, transmitter will be to be transmitted
Information carries out Manchester's code, then by phase inverter, and information is overturn, and forms two-way with same frequency and reversed-phase signal, then by two
It, can be into the transmission of row information, into communication shape by backscattering TV signals in the with same frequency and reversed-phase signal modulation to TV signals of road
State；
Two-way with same frequency and reversed-phase signal is transmitted respectively by the opposite poliarizing antenna of two polarization directions of transmitter, receiver
Two antennas receive the signal of corresponding direction respectively；
Two poliarizing antennas of receiver not only receive the two-way with same frequency and reversed-phase signal of transmission, can equally receive with frequency
TV signals, two paths of signals by envelope detector and then by analog subtracter is subjected to additive operation, balances out TV signals
Interference；
The amplitude of the signal obtained after additive operation through threshold comparator with threshold value is compared, and is compiled by Manchester
Code rule decodes the information of transmission.
In the decoding process of backscattering, since antenna not only receives the signal of transmission, but also can directly receive
The TV signals do not modulated, WIFI signal etc. will decode the information of transmission, need to eliminate the influence of TV signals, WIFI signal etc.,
And the problem of in view of energy consumption, it needs to realize using simple analog device.There are mainly two types of existing solutions：One
Kind method is that average treatment is done to received signal to eliminate TV signals, WIFI signal, but this method limit the speed of transmission
Rate, signal can only be less than being transmitted under Mean Speed；Another method uses double-antenna structure, since two antennas all can
Receive TV signals, the signal received to two antennas does division arithmetic, can eliminate the interference of TV signals, this method is to speed
There is no limit for rate, but this method needs to realize division arithmetic using a large amount of device, increases the volume of equipment, and pass through
The size of obtained ratio carrys out decoded signal, the use of decoded accuracy rate is not very high since gap is smaller between ratio.
The present invention is transmitted information and is eliminated the dry of TV signals by simple subtraction using differential transfer mode
It disturbs.Differential transfer is exactly transmitting terminal opposite electric signal of transmission amplitude equal phase on two strip antennas, and receiving terminal is to receiving
Two signal subtractions are achieved in that the double signal of amplitude.Due in the two paths of signals that receives all comprising TV signals,
By additive operation, the interference of TV signals can be eliminated, and subtraction can be by simple device it is achieved that reducing
The volume of equipment.Since by additive operation, the amplitude of signal is double, passes through simple threshold circuit during decoded
It can accurate decoded signal.Differential transfer also has very strong interference free performance, and jamproof principle is：If two letters
Number line all receives equally（Same phase, constant amplitude）Interference signal, since receiving terminal subtracts to the signal of the two lines of receiving fortune
It calculates, therefore interference signal is by basic neutralisation.
But use differential transfer mode in environment backscattering needs to solve there are one problem, differential transfer before
Be both used in it is wired in the case of, in the case of wireless, on two antennas transmission hold very much in same channel with the signal of frequency
Easily interfere with each other.Two antennas of transmitting terminal and receiving terminal how to be allowed to transmit data respectively without being interferedCommon solution
Method is frequency division multiplexing or time division multiplexing, but since back-scattered signal reflects TV signals, frequency is consistent, institute
Unavailable with frequency division multiplexing, if needing to store received data if using time division multiplexing, this is anti-to environment
It is clearly unreasonable to scattering.In order to solve this problem, the present invention is transmitted using the antenna of different polarization directions,
The linear polarization direction of two antennas of transmitting terminal is mutually perpendicular to, two reception antennas of signal receiving end are similarly placed, this
Sample does not interfere with each other between can realizing two antennas.
Communication distance can effectively be increased using suitable coding mode and reduce the bit error rate.But traditional coding
Mechanism such as CDMA carrys out coding information using random sequence, for example, representing byte 0 with " 101110111 " sequence, uses sequence
" 111011011 " represent byte 1, but in decoding process, receiving terminal need to do received signal synchronization process and
It carries out related calculation, but this is impossible in environment backscattering, the energy of absorption is insufficient to realize related and same
Step calculates.Existing method is using orthogonal coding, which copies the orthogonality of cosine and sine signal, is generated in output terminal similar
The periodic signal of cosine and sine signal, such as：1 is represented with " 10101010 ", and " 00000000 " represents 0, by receiving terminal
It calculates the amount received and carrys out decoded information, change method and although do not need to synchronize information processing, it require that more
Position information represents an information, and this method still needs to carry out related calculation, this, which is undoubtedly, wastes energy.
In order to solve this problem, the present invention for the first time uses Manchester's code in environment backscattering, in Man Chesi
In spy's coding, there is a saltus step in the centre of each, and clock signal, but also date number are not only made in the saltus step among position；From low to high
Saltus step represents " 1 ", and saltus step from high to low represents " 0 ".Clock and data are included in data flow by Manchester's code, are being passed
While defeated code information, clock sync signal is also transferred to other side together, has a saltus step in every coding, there is no direct currents
Component, therefore with self-synchronization and good interference free performance.Recipient utilizes the specific coding for including synchronizing signal
Synchronizing signal is extracted to lock the clock pulse frequency of oneself from signal itself, reaches synchronous purpose.
Motor synchronizing can be realized using Manchester's code, and only can represent one with the data in a time slot
Byte, not only saving the time in this way also saves energy, is to be most suitable for environment backscattering.Mancunian schematic diagram is such as
Shown in Fig. 2, transmitted on the antenna of different polarization directions comprising Manchester's code and its reverse signal, two paths of signals in figure,
By doing additive operation in receiving terminal, double amplitude, decoded accuracy rate increase can be reached.
Two methods are combined the performance that can enhance environment backscattering to greatest extent, can be with using Manchester code
It is effective to increase transmission range, there is good inhibiting effect to the interference in channel using differential transfer mode, also reduce in this way
The bit error rate of environment backscattering.
Claims (1)
1. a kind of use differential transfer and the method for Manchester's code enhancing backscattering, it is characterised in that including following step
Suddenly：
Environment backscattering device is built, transmitter and receiver including being integrated with power management module in it, by transmitter
On antenna be installed as two orthogonal poliarizing antennas of polarization direction, the antenna on receiver is also being installed as two polarization directions just
The poliarizing antenna of friendship, and polarization direction and the polarization direction of transmitter poliarizing antenna are consistent, transmitter is on the original basis
Increase a phase inverter, receiver includes two envelope detectors, an analog subtracter and a threshold comparator；
Transmitter respectively first adjusts impedance matching condition with receiver, and energy is obtained from TV signals in the case of impedance matching,
Transmitter is stored in in the capacitor of power management module in receiver, energy is provided to realize to communicate；
Transmitter and receiver respectively adjust impedance matching condition again, and when impedance mismatch, transmitter is by information to be transmitted
Manchester's code is carried out, then by phase inverter, information is overturn, forms two-way with same frequency and reversed-phase signal, then two-way is same
Frequency inversion signal is modulated in TV signals, can be into the transmission of row information, into communications status by backscattering TV signals；
Two-way with same frequency and reversed-phase signal is transmitted respectively by the opposite poliarizing antenna of two polarization directions of transmitter, and the two of receiver
Root antenna receives the signal of corresponding direction respectively；
Two poliarizing antennas of receiver not only receive the two-way with same frequency and reversed-phase signal of transmission, can equally receive the TV of same frequency
Two paths of signals is carried out additive operation by envelope detector and then by analog subtracter, balances out the interference of TV signals by signal；
The amplitude of the signal obtained after additive operation through threshold comparator with threshold value is compared, and is advised by Manchester's code
Then decode the information of transmission.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107911193B (en) * | 2017-09-29 | 2019-11-19 | 浙江大学 | The symbol detection method of environment backscatter system based on Differential Manchester Encoding |
| CN108833316B (en) * | 2018-04-08 | 2021-01-15 | 中国船舶重工集团公司第七一九研究所 | Passive WiFi scattering communication method and system based on MCU (microprogrammed control Unit) |
| US10484044B1 (en) * | 2018-05-01 | 2019-11-19 | Huawei Technologies Co., Ltd. | Differential termination modulation for back-channel communication |
| CN109889236B (en) * | 2019-01-24 | 2022-02-01 | 西北大学 | Alamouti coding-based joint coding method for single-base type backscattering communication |
| CN110266339B (en) * | 2019-05-06 | 2020-08-11 | 西安电子科技大学 | PNC decoding circuit for full-duplex backscatter communication |
| 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 |
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| CN101821785A (en) * | 2007-09-11 | 2010-09-01 | Rf控制有限责任公司 | Steerable phase array antenna rfid tag locater and tracking system and methods |
| CN102257741A (en) * | 2009-03-27 | 2011-11-23 | 光电认识株式会社 | Back scattering type rfid communication system |
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| US7095794B2 (en) * | 2001-10-23 | 2006-08-22 | Ncr Corporation | Methods and apparatus for a spread spectrum modulated backscatter electronic shelf label system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101821785A (en) * | 2007-09-11 | 2010-09-01 | Rf控制有限责任公司 | Steerable phase array antenna rfid tag locater and tracking system and methods |
| CN102257741A (en) * | 2009-03-27 | 2011-11-23 | 光电认识株式会社 | Back scattering type rfid communication system |
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