CN106656245A - WiFi data transmission system and WiFi data transmission method capable of acquiring energy by means of back scattering - Google Patents
WiFi data transmission system and WiFi data transmission method capable of acquiring energy by means of back scattering Download PDFInfo
- Publication number
- CN106656245A CN106656245A CN201610814679.7A CN201610814679A CN106656245A CN 106656245 A CN106656245 A CN 106656245A CN 201610814679 A CN201610814679 A CN 201610814679A CN 106656245 A CN106656245 A CN 106656245A
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- wifi
- energy
- data transmission
- wifi data
- transmission system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention provides a WiFi data transmission system and a WiFi data transmission method capable of acquiring energy by means of back scattering. The WiFi data transmission system does not depend on any external power supply system and performs data transmission by means of energy which is included in WiFi data packets. Relatively high convenience in hardware system disposition is realized. Furthermore to-be-output information is modulated through a WiFi data processing chip for forming standard-format uplink WiFi packages, and the WiFi packages are transmitted to the antenna. The WiFi data transmission system and the WiFi data transmission method have advantages of unified data format and relatively high data transmission rate.
Description
Technical field
The present invention relates to electronics and wireless communication field, more particularly, to a kind of utilization backscattering energy is obtained
WiFi data Transmission system and method.
Background technology
Having had more research to be conceived to the signal launched using WiFi equipment recently carries out energy harvesting, Zhi Houli
It is the relatively simple application of equipment charge or driving with resulting energy, and achieves a range of achievement；Wherein
Have a big class based on backscatter technique, using particular array antenna and wireless energy acquisition device to WiFi signal at
Reason, by the energy entrained by RF signals by the interim stable DC electricity of output after conversion, rectification, storage, management, voltage stabilizing
Pressure.Backscatter antenna is optimized for energy harvesting, and the memory cell and administrative unit of outfit need in itself consumption one
Portion of energy.It should be noted that in this kind equipment, entrained and transmission the information of WiFi signal itself will be dropped,
Only energy is utilized.
Meanwhile, the another kind of passive RF information transfer system, such as radio frequency identification technology RFID, equipment will be distinguished
For active device and passive device.Active device is generally reader end, it is believed that its energy supply is unrestricted, is responsible for actively
Transmitting data simultaneously transmit energy to passive equipment by the form of electromagnetic field；And passive device function is generally passive, energy
Need from active devices to be obtained by the form of electromagnetic field.Such technology is disadvantageous in that its form of communication is response formula,
Initiated after poll by active devices, just can report state, transmission information to active devices, therefore, in real-time, transfer rate
Require there is larger restriction in higher application scenarios.Secondly, RFID system is more closed, between active devices and passive equipment
The main users end data for swapping, memory unit of the general storage positioned at passive equipment；And as data transmission interface,
RFID then has inconvenience.If sensor data transmission system of the deployment based on RFID, also have in the system integration certain
Limitation.
The content of the invention
The present invention provides the WiFi data Transmission system that a kind of utilization backscattering obtains energy, the system transfers speed compared with
Hurry up, dispose more convenient.
In order to reach above-mentioned technique effect, technical scheme is as follows：
A kind of utilization backscattering obtains the WiFi data Transmission system of energy, including the WiFi antennas being sequentially connected with,
RF-DC modular converters, energy stores management module and WiFi data process chip, WiFi data process chip also with WiFi antennas
Connection.
Further, the pre- rectifier filter that the RF-DC modular converters include, rectification circuit, rear rectifier filter and
State encoder；Pre- rectifier filter, rectification circuit, rear rectifier filter are sequentially connected with, rectification circuit also with state encoder
Connection, pre- rectifier filter is also connected with WiFi antennas, and rear rectifier filter is connected with energy stores management module, state encoding
Device is connected with WiFi data process chip.
Further, the energy stores management module energy storage units, energy management unit and mu balanced circuit；Energy
Memory cell and voltage-stablizer are connected with energy management unit, and energy storage units are connected with rear rectifier filter, voltage-stablizer with
WiFi data process chip connects.
Preferably, the energy storage units are electric capacity.
Preferably, the WiFi antennas are array antennas.
A kind of utilization backscattering obtains the WiFi data transmission of energy, comprises the following steps：
S1：WiFi antennas receive WiFi signal, carry out collection of energy；
S2：The energy collected is changed and rectification using RF-DC modular converters, is obtained the first direct current signal Vdc1
With WiFi control information；
S3：Using energy stores management module the energy of the first direct current signal Vdc1 is stored and managed, and it is defeated
Go out the second constant DC voltage signal Vdc2, be transported to WiFi data process chip；
S4：WiFi data process chip receives the second constant DC voltage signal Vdc2 and WiFi control information, and with the
Two constant DC voltage signal Vdc2 are that energy originates that WiFi control information is modulated and is encoded to form reference format
Up WiFi bags re-send to WiFi antennas；
S5：WiFi antennas send the up WiFi bags of reference format, are communicated with other WiFi equipments.
In the present invention, WiFi antennas are made up of feeding microstrip line, medium substrate and underlay substrate, are WiFi collection of energy
First entrance；The WiFi antennas of the present invention make for being optimized in frequency range narrower near the 2.4GHz carrier signals of WiFi
Its resonance center is less in 2.4GHz reflectance factors in 2.4GHz, makes antenna effectively transmit energy.
The RF-DC modular converters of the present invention are rectified into RF energy the DC current of one variable-magnitude, by pre- rectification
Wave filter, rectification circuit and rear rectifier filter are constituted；Pre- rectifier filter be a bandpass filter, there is provided filter with low insertion loss it is same
When export frequency-selecting after high-frequency signal to rear class rectification circuit, and prevent commutation diode generation higher hamonic wave reflex to day
Line.Rear class rectification carries out energy conversion to high-frequency signal, is output as the first direct current signal Vdc1 of voltage variable, WiFi fundamental frequencies letter
Number it is filtered out, rear rectifier filter is Dc Pass structures, and high-frequency signal is isolated with load paths.
The energy stores management module of the present invention is stored and managed to the energy that prime is exported entrained by Vdc1, interior
Energy content memory cell, energy management unit and mu balanced circuit.Energy management unit determines and calculates energy according to present load
Output pulse length and output current intensity.Constant DC voltage Vdc2 is exported after voltage stabilizing, the process of rear class WiFi data is transported to
In chip.
Wherein, the power consumption control of WiFi data process chip is within 100 μ W.WiFi data process chip is only using numeral
Circuit carries out the modulation of data and coding.Low-frequency fundamental frequency signal can be completed by low-power consumption PLL, therefore function described above
Can be completed by the WiFi data process chip.The Vdc2 that the energy source of WiFi data process chip exports for prime.
Simultaneously WiFi data process chip needs to receive simple control signal, the energy that this function is changed using RF-DC
State is encoded；WiFi data process chip carries out obtaining command word after simple process, such as device id poll, prepare transmission,
Currently available channel Channel etc., will respond afterwards after WiFi data is modulated in the above described manner and encodes in formation standard
Row WiFi bags.
Compared with prior art, the beneficial effect of technical solution of the present invention is：
The present invention does not rely on any external power source electric power system, and the energy included merely with WiFi data bag enters line number
According to transmission, it is just more convenient from from the aspects of the deployment of hardware system, and by WiFi data process chip to be exported
Information to be formed after being modulated and be sent to antenna after the up WiFi bags of reference format, and data form is unified, message transmission rate
Also it is higher.
Description of the drawings
Fig. 1 is the overall structure and energy signal flow graph of present system figure；
Fig. 2 is the structured flowchart of the RF-DC modular converters of present system；
Fig. 3 is the structured flowchart of the energy stores management module of present system；
Fig. 4 is the structured flowchart of the WiFi data process chip of present system；
Fig. 5 is the flow chart of the inventive method.
Specific embodiment
Accompanying drawing being for illustration only property explanation, it is impossible to be interpreted as the restriction to this patent；
In order to more preferably illustrate the present embodiment, accompanying drawing some parts have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it can be to understand that some known features and its explanation may be omitted in accompanying drawing
's.
Technical scheme is described further with reference to the accompanying drawings and examples.
Embodiment 1
As shown in figure 1, a kind of utilization backscattering obtains the WiFi data Transmission system of energy, including what is be sequentially connected with
WiFi antennas, RF-DC modular converters, energy stores management module and WiFi data process chip, WiFi data process chip is also
It is connected with WiFi antennas.
In the present embodiment, the pre- rectifier filter that RF-DC modular converters include, rectification circuit, rear rectifier filter and shape
State encoder；Pre- rectifier filter, rectification circuit, rear rectifier filter are sequentially connected with, and rectification circuit also connects with state encoder
Connect, pre- rectifier filter is also connected with WiFi antennas, and rear rectifier filter is connected with energy stores management module, state encoder
It is connected with WiFi data process chip.
Energy stores management module energy storage units, energy management unit and mu balanced circuit；Energy storage units and steady
Depressor is connected with energy management unit, and energy storage units are connected with rear rectifier filter, and voltage-stablizer is processed with WiFi data
Chip connects.
Wherein, energy storage units are electric capacity；WiFi antennas are array antennas.
In the present embodiment, the invention system is received using high-gain, high efficiency micro-strip WiFi antenna pair WiFi signal.
The WiFi antennas are made up of feeding microstrip line, medium substrate and underlay substrate, are the first entrance of WiFi collection of energy.Micro-strip
WiFi antennas in frequency range narrower near the 2.4GHz carrier signals of WiFi for being optimized so as to which resonance center exists
2.4GHz, it is less in 2.4GHz reflectance factors, make antenna effectively transmit energy.Through-put power Pt of WiFi antennas is by transmission power
Pr, gain G t and Gr of array microstrip antenna and the wavelength X of electromagnetic wave and transmission range R are determined.WiFi microstrip antennas exist
There is larger gain index GtGr on the basis of smaller size smaller.Because WiFi transmission powers are limited by standard, therefore WiFi antennas
Part, is further to improve energy conversion efficiency, and it is strengthened using the form of array antenna.
RF-DC modular converters are rectified into the DC current of a variable-magnitude, i.e. DC is changed, and RF-DC modular converters are by pre-
Rectifier filter, rectification circuit and rear rectifier filter are constituted, DC transfer processes must some energy be converted to heat energy,
Pdc1 represents the electric energy after being converted into, and whole efficiency can use η1To weigh.
Pre- rectifier filter is made up of passive device inductance L and electric capacity C, is a bandpass filter, and its purpose of design is
Overall transformation efficiency eta is maximized, and exports the high-frequency signal after frequency-selecting to rear class rectification circuit.If rear class rectification circuit is included
Dry Schottky diode and some passive networks, i.e. resistance device Rx, capacitor element Cx and inductance component Lx.Rectification circuit is to height
Frequency signal carries out energy conversion, is output as the first direct current signal Vdc1 of voltage variable.WiFi fundamental frequency signals are filtered out.
Energy stores management module is stored and managed to the energy that prime is exported entrained by Vdc1, and interior energy content is deposited
Storing up electricity appearance, energy management unit and mu balanced circuit, energy management unit determines and calculates energy output pulse according to present load
Length PW and output current intensity I.Constant DC voltage Vdc2 is exported after voltage stabilizing, rear class WiFi data process chip is transported to
In.Also some energy is consumed for energy stores and the process of management, and Pdc2 represents the power of final output, whole efficiency
η can be used2To weigh.
The energy source Relative transmission power ratio of WiFi data process chip is η.
Have benefited from CMOS technology progress, the power consumption of WiFi data process chip can be controlled within 100 μ W.Due to WiFi
The energy-consuming parts such as ADC, LNA and High-frequency PLL are needed in receiver, therefore WiFi data process chip can be in necessary feelings
Give up above analog component under condition, modulation and the coding of data are only carried out using digital circuit.Such as IEEE 802.11b are used
DBPSK and DQPSK are modulated in physical layer, and DSSS and CCK is encoded.Fundamental frequency 11MHz, the generation of this frequency signal is by structure phase
Simple low-power consumption PLL can be completed, therefore function described above can be completed by the WiFi data process chip.WiFi
The Vdc2 that the energy source of data processing chip exports for prime.
Simultaneously the WiFi data process chip needs to receive simple control signal, and this function is changed using RF-DC
To Vdc1 states represent ' 1 ' and ' 0 ' respectively, this coded system only needs to make RF-DC modules simple modification, and adds one
State encoder；Its main composition is voltage comparator：When being more than virtual value such as Vdc1, it is believed that the single Bit of WiFi control bags
Position is ' 1 ', is otherwise ' 0 '.WiFi chip carries out obtaining command word after simple process, such as prepares transmission, currently available channel
Channel etc., forms the up WiFi bags of reference format after afterwards response data being modulated in the above described manner and encoded.
Last antenna sends standard WiFi bag with WiFi frequency ranges and channel, is communicated with other WiFi equipments.
Embodiment 2
A kind of utilization backscattering obtains the WiFi data transmission of energy, comprises the following steps：
S1：WiFi antennas receive WiFi signal, carry out collection of energy；
S2：The energy collected is changed and rectification using RF-DC modular converters, is obtained the first direct current signal Vdc1
With WiFi control information；
S3：Using energy stores management module the energy of the first direct current signal Vdc1 is stored and managed, and it is defeated
Go out the second constant DC voltage signal Vdc2, be transported to WiFi data process chip；
S4：WiFi data process chip receives the second constant DC voltage signal Vdc2 and WiFi control information, and with the
Two constant DC voltage signal Vdc2 are that energy originates that WiFi control information is modulated and is encoded to form reference format
Up WiFi bags re-send to WiFi antennas；
S5：WiFi antennas send the up WiFi bags of reference format, are communicated with other WiFi equipments.
The corresponding same or analogous part of same or analogous label；
Position relationship for the explanation of being for illustration only property described in accompanying drawing, it is impossible to be interpreted as the restriction to this patent；
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no need to be exhaustive to all of embodiment.It is all this
Any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (6)
1. a kind of utilization backscattering obtains the WiFi data Transmission system of energy, it is characterised in that including what is be sequentially connected with
WiFi antennas, RF-DC modular converters, energy stores management module and WiFi data process chip, WiFi data process chip is also
It is connected with WiFi antennas.
2. utilization backscattering according to claim 1 obtains the WiFi data Transmission system of energy, it is characterised in that institute
State the pre- rectifier filter that RF-DC modular converters include, rectification circuit, rear rectifier filter and state encoder；Pre- rectification filter
Ripple device, rectification circuit, rear rectifier filter are sequentially connected with, and rectification circuit is also connected with state encoder, and pre- rectifier filter is also
It is connected with WiFi antennas, rear rectifier filter is connected with energy stores management module, state encoder processes core with WiFi data
Piece connects.
3. utilization backscattering according to claim 1 obtains the WiFi data Transmission system of energy, it is characterised in that institute
State energy stores management module energy storage units, energy management unit and mu balanced circuit；Energy storage units and voltage-stablizer are equal
It is connected with energy management unit, energy storage units are connected with rear rectifier filter, voltage-stablizer connects with WiFi data process chip
Connect.
4. utilization backscattering according to claim 3 obtains the WiFi data Transmission system of energy, it is characterised in that institute
It is electric capacity to state energy storage units.
5. utilization backscattering according to claim 1 obtains the WiFi data Transmission system of energy, it is characterised in that institute
It is array antenna to state WiFi antennas.
6. the utilization backscattering described in a kind of any one of claim 1-5 obtains the WiFi of the WiFi data Transmission system of energy
Data transmission method, it is characterised in that comprise the following steps：
S1：WiFi antennas receive WiFi signal, carry out collection of energy；
S2：The energy collected is changed and rectification using RF-DC modular converters, obtain the first direct current signal Vdc1 and
WiFi control information；
S3：Using energy stores management module the energy of the first direct current signal Vdc1 is stored and managed, and exported
Two constant DC voltage signal Vdc2, are transported to WiFi data process chip；
S4：WiFi data process chip receives the second constant DC voltage signal Vdc2 and WiFi control information, and permanent with second
Determine d. c. voltage signal Vdc2 to form the up of reference format to be modulated WiFi control information and encode for energy source
WiFi bags re-send to WiFi antennas；
S5：WiFi antennas send the up WiFi bags of reference format, are communicated with other WiFi equipments.
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| CN201610814679.7A CN106656245A (en) | 2016-09-09 | 2016-09-09 | WiFi data transmission system and WiFi data transmission method capable of acquiring energy by means of back scattering |
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| CN201610814679.7A CN106656245A (en) | 2016-09-09 | 2016-09-09 | WiFi data transmission system and WiFi data transmission method capable of acquiring energy by means of back scattering |
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| CN109904188A (en) * | 2019-03-04 | 2019-06-18 | 电子科技大学 | Flexible WIFI signal energy converter based on perovskite diode and preparation method thereof |
| CN110472717A (en) * | 2019-09-20 | 2019-11-19 | 广州市晶凌电子有限公司 | It is collected with micro-energy, the monolithic integrated optical circuit of digital coding and radio-frequency transmissions |
| CN111132342A (en) * | 2019-12-26 | 2020-05-08 | 重庆邮电大学 | Multi-carrier resource allocation method based on wireless power supply backscattering communication network |
| WO2020119724A1 (en) * | 2018-12-14 | 2020-06-18 | 华为技术有限公司 | Communication method, communication apparatus, and storage medium |
| CN111355509A (en) * | 2018-12-24 | 2020-06-30 | 深圳先进技术研究院 | Radio frequency transmitter |
| CN113891424A (en) * | 2021-10-13 | 2022-01-04 | 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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Application publication date: 20170510 |