CN113207174A - Backscattering communication method, device and system - Google Patents
Backscattering communication method, device and system Download PDFInfo
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- CN113207174A CN113207174A CN202110298395.8A CN202110298395A CN113207174A CN 113207174 A CN113207174 A CN 113207174A CN 202110298395 A CN202110298395 A CN 202110298395A CN 113207174 A CN113207174 A CN 113207174A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/22—Scatter propagation systems, e.g. ionospheric, tropospheric or meteor scatter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
The invention discloses a backscattering communication method, which is applied to a label, wherein the label is provided with a signal reflector and a wake-up receiver, the signal reflector is provided with a tunnel diode, and the method comprises the following steps: receiving query information sent by a base station; the awakening receiver responds to the inquiry information and sends access request information to the base station; receiving resource allocation information sent by the base station, wherein the resource allocation information comprises time slot resource information and frequency point resource information; acquiring an irradiation source signal sent by a base station; amplifying, by the tunnel diode, the illumination source signal; and according to the resource allocation information, the signal reflector reflects the amplified illumination source signal to a base station. The invention can improve the transmission distance of the backscattering communication system, avoid collision and collision when the label is accessed into the channel and improve the communication efficiency.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a backscattering communication method, device and system.
Background
Along with the rapid development of the internet of things, the radio frequency identification is a key technology for the development of the internet of things, and is greatly concerned by the academic field and the industrial field, a backscattering communication technology is provided in a radio frequency identification system, and the technology can greatly reduce the maintenance difficulty of communication between multiple tags and a reader-writer of a base station.
In the prior art, the backscatter communication technology still has the problems of limited communication distance, limited power consumption and the like. Specifically, generally, the backscatter communication technology can only support a transmission distance of several meters to tens of meters under microwatt-level power consumption, so that wide coverage of a wireless area cannot be realized under a low-power-consumption scene, and application and development of the backscatter communication technology are hindered; in addition, the backscatter communication technology is limited by power consumption, and is difficult to use with more complex circuits, thereby causing low communication accuracy, and particularly in a large-scale label deployment scenario, because a label cannot accurately judge whether an accessed channel is idle, severe collision and collision can occur when the label accesses the channel, thereby causing the deployment number of the labels to be limited; secondly, the deployment scheme of large-scale labels in the prior art is complex and the realization difficulty is high.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a backscatter communication method. The technical problem to be solved by the invention is realized by the following technical scheme:
a backscatter communication method applied to a tag configured with a signal reflector configured with a tunnel diode and a wake-up receiver, the method comprising: receiving query information sent by a base station; the awakening receiver responds to the inquiry information and sends access request information to the base station; receiving resource allocation information sent by the base station, wherein the resource allocation information comprises time slot resource information and frequency point resource information; acquiring an irradiation source signal sent by a base station; amplifying, by the tunnel diode, the illumination source signal; and according to the resource allocation information, the signal reflector reflects the amplified illumination source signal to a base station.
In one embodiment of the present invention, the signal reflector is configured with a bias voltage module for applying a bias voltage to the tunnel diode through which the illumination source signal is amplified, comprising: controlling the impedance Z of the tunnel diodeLAnd an antenna input impedance ZAMatch, expressed as: xA＝-XLWherein X isLIs ZLImaginary part of, XAIs ZAAn imaginary part of (d); obtaining a reflection coefficient expression expressed as:
adjusting the bias voltage to a preset value range through the bias voltage module, wherein the preset value range is used for controlling the tunnel diode to present negative impedance characteristics; when the tunnel diode exhibits negative impedance characteristics, determining a reflection coefficient according to the reflection coefficient expression, expressed as:
wherein, R isLIs ZLReal part of (R)AIs ZAThe real part of (a); amplifying the illumination source signal according to the reflection coefficient.
In one embodiment of the present invention, after the illumination source signal corresponds to a predetermined illumination source frequency and the illumination source signal is amplified according to the reflection coefficient, the method further comprises: controlling the real part R of the impedance of the tunnel diodeLAnd the real part R of the input impedance of the antennaAEqualising to cause said tunnel diode to oscillate, denoted as:RA＝RL(ii) a And locking the oscillation frequency generated by the tunnel diode to the preset irradiation source frequency through injection locking.
The invention has the beneficial effects that:
the invention can amplify the irradiation source signal sent by the base station through the tunnel diode, improve the transmission distance of the backscattering communication system, orderly reflect the amplified irradiation source signal to the base station according to the resource distribution information sent by the base station, and particularly can avoid collision and collision when the label is accessed to a channel in a large-scale label deployment scene, thereby improving the communication efficiency.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a flow chart of steps of a backscatter communication method applied to a tag according to an embodiment of the invention;
fig. 2 is a schematic diagram of frequency point resource information according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal circuit structure of a tag according to an embodiment of the present invention;
fig. 4 is a schematic view of a current-voltage characteristic curve of a 3I306G tunnel diode according to an embodiment of the present invention;
fig. 5 is a schematic diagram of multi-labeled resource allocation information according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a signal reflector according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a packet structure of query information according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating steps of a backscatter communication method applied to a base station according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating steps of a tag accessing a base station according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a backscatter communication device applied to a tag according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a backscatter communication device applied to a base station according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a backscatter communication system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, fig. 1 is a backscatter communication method provided by an embodiment of the present invention and applied to a tag, where the tag is configured with a signal reflector and a wake-up receiver, and the signal reflector is configured with a tunnel diode, and the method includes:
And 102, responding to the inquiry information, the awakening receiver sends access request information to the base station.
The invention can be applied to a backscattering communication system of multi-label deployment. The query information is such as Beacon signals, the awakening receiver can continuously monitor the query signals in the wireless channel, and when the awakening receiver monitors the query information, the tag is awakened to enter a working state and sends access request information to the base station, so that the power of the receiver can be saved while short transmission delay is provided, the tag is started when needed, the power consumption of the whole backscatter communication system is reduced, and the cruising ability of the tag is improved.
The invention uses the mode of combining frequency division multiplexing and time division multiplexing, controls the label to accurately judge whether the accessed channel is idle, avoids serious collision and collision when the label is accessed into the channel, and improves the communication efficiency between the label and the base station. Specifically, the base station allocates time slot resource information and frequency point resource information to the tag in the frequency domain and the time domain, for example, in the range from the frequency domain f + Δ f1 to the frequency domain f + Δ fn, n frequency points are divided at equal intervals, f + Δ f1 is determined as an access frequency point, and the rest n-1 frequency points are used for communication between the tag and the base station. Fig. 2 is a schematic diagram of frequency point resource information according to an embodiment of the present invention. For the tags, m time slots are divided in a time domain in one time slot, and n-1 tags are modulated and communicated by using n-1 different modulation frequencies from delta f2 to delta fn, so that the base station can support m x (n-1) tags to communicate with the base station, the deployment scale of the tags is enlarged, the number of the tags supported by a backscatter communication system can be increased, and the mutual interference among the tags is reduced.
Optionally, after the step 103, the method further includes: and when the base station receives reply information fed back by the label based on the resource allocation information, adding the label to an association list.
And step 104, acquiring an illumination source signal sent by the base station.
Optionally, the signal reflector is configured with a bias voltage module for applying a bias voltage to the tunnel diode.
Fig. 3 is a schematic diagram of an internal circuit structure of a tag according to an embodiment of the present invention. The circuit structure schematic diagram comprises an antenna, a tunnel diode, a capacitor C1, a capacitor C2 and an inductor L1, wherein the tunnel diode is a 3I306G tunnel diode.
Optionally, the step 105 of amplifying, by the tunnel diode, the illumination source signal includes:
step S11, controlling the impedance Z of the tunnel diodeLAnd an antenna input impedance ZAMatch, expressed as:
XA＝-XL，
wherein, XLIs ZLImaginary part of, XAIs ZAThe imaginary part of (c).
Step S12, obtaining a reflection coefficient expression, expressed as:
step S13, adjusting the bias voltage to a preset value range by the bias voltage module, wherein the preset value range is used for controlling the tunnel diode to present a negative impedance characteristic.
It should be noted that the preset value range is preset according to the business needs of those skilled in the art, and the present invention is not limited thereto, and the preset value range is usually 100-200 mv. Referring to fig. 4, which is a schematic view of a current-voltage characteristic curve of a 3I306G tunnel diode according to an embodiment of the present invention, in fig. 4, a horizontal axis represents voltage, and a vertical axis represents current. The label based on the tunnel diode is different from the traditional label, the label can amplify an irradiation source signal with extremely low power consumption and then reflect the irradiation source signal, and the distance of backscatter communication can be effectively increased. Specifically, the tunnel diode is characterized by exhibiting a negative resistance characteristic under a certain bias voltage, and it can be seen from fig. 4 that as the bias voltage increases, the current decreases, and the tunnel diode exhibits a negative resistance characteristic.
Step S14, when the tunnel diode exhibits a negative impedance characteristic, determining a reflection coefficient according to the reflection coefficient expression, which is expressed as:
wherein, R isLIs ZLReal part of (R)AIs ZAThe real part of (a).
Based on the provided negative impedance characteristic of the tunnel diode, the absolute value of the reflection coefficient of the tag can be made larger than 1, so that the gain of the amplifier in the signal reflector is larger than 1.
And step S15, amplifying the illumination source signal according to the reflection coefficient.
Optionally, the illumination source signal corresponds to a preset illumination source frequency.
Optionally, in step S15, after the amplifying the illumination source signal according to the reflection coefficient, the method further includes:
step S21 of controlling the real part R of the impedance of the tunnel diodeLAnd the real part R of the input impedance of the antennaAEqualising to cause said tunnel diode to oscillate, denoted as:
RA＝RL。
based on step S14, it can be seen that by selecting the appropriate RAAny gain can be obtained, and when the real part of the impedance of the tunnel diode is equal to the real part of the antenna input impedance, the tag gain becomes infinite, and the tunnel diode oscillates.
And step S22, locking the oscillation frequency generated by the tunnel diode to the preset irradiation source frequency through injection locking. The irradiation source signal is preconfigured with a preset irradiation source frequency, when the preset irradiation source frequency is the same as the oscillation frequency of the tunnel diode during oscillation, the oscillation generated by the tag can be locked at the irradiation source frequency by injection locking, the gain of the tag is further effectively improved, and the communication distance of the backscatter system is further improved.
And 106, reflecting the amplified illumination source signal to a base station by the signal reflector according to the resource allocation information.
Referring to fig. 5, a schematic diagram of multi-label resource allocation information according to an embodiment of the present invention is provided. The horizontal axis is a time axis, different blocks represent the division of time slots, and the vertical axis is a frequency axis, and due to the existence of the wake-up receiver, the moment when the base station sends the query signal is taken as the starting point of the time axis, and then the base station reflects a single carrier signal to provide an illumination source for the backscatter tag, namely an illumination source signal. The frequency of the single carrier signal is set by those skilled in the art according to the service requirement, and the present invention is not limited, and is usually 900 MHZ. The label which is not connected with the base station establishes connection with the base station at the reserved access frequency point, and the label which establishes connection sends data according to the time slot and the frequency point [ Tx, Fy ] in the allocation resource information.
Optionally, the signal reflector includes a switch assembly and a single chip microcomputer.
Optionally, in step 106, the reflecting the amplified illumination source signal to a base station by the reflected signal reflector according to the resource allocation information includes:
step S31, when the single chip microcomputer outputs a square wave with a preset fixed frequency, the switch assembly enters an open-close state, and meanwhile, the signal reflector generates binary data 1; or the like, or, alternatively,
step S32, when the single chip microcomputer stops outputting square waves with preset fixed frequency, the signal reflector generates binary data 0;
step S33, according to the resource allocation information, the signal reflector reflects the amplified illumination source signal carrying binary data to a base station.
Fig. 6 is a schematic structural diagram of a signal reflector according to an embodiment of the present invention, where the signal reflector includes: the device comprises a backscatter signal amplifier, a switching component, a bias voltage module and a single chip microcomputer, wherein the single chip microcomputer can generate square waves with preset fixed frequency, BFin represents irradiation source signals, and BFout represents amplified irradiation source signals.
Since the impedance of the tag changes as the bias voltage applied to the tunnel diode changes, the bias voltage is controlled to switch between 0V and 150mV by opening and closing the switching element, thereby switching the tag between amplifying the illumination source signal and not amplifying the illumination source signal. Specifically, for each tag, the single chip generates a square wave (for example, 100kHz) with a preset fixed frequency Δ f to control the switching of the switching component, where the preset fixed frequency is preset by a person skilled in the art according to business needs, and the present invention is not limited specifically. When the switching element is controlled to be in an open and closed state by the square wave, the signal reflector transmits binary data '1', and when the square wave is completely turned off, the signal reflector transmits binary data '0'. For example, when the radiation source signal frequency is f, and the square wave control switch assembly with the preset fixed frequency Δ f is switched on and switched off, the amplified radiation source signal frequency is changed to f + Δ f, so that the base station can separate the radiation source signal from the amplified radiation source signal in the frequency domain, and further demodulate the radiation source signal, and the interference of the radiation source signal to the amplified radiation source signal can be effectively reduced. .
Optionally, after the signal reflector reflects the amplified illumination source signal to a base station, the method further includes: and controlling the tag to enter a dormant state.
The dormant state can extend the standby time of the tag.
Optionally, the query information includes a preamble, a packet length, and a CRC check code.
After the base station establishes communication connection with the tag, a data frame sent by the tag uses 10101010 as a lead code, and a load part and a check bit are arranged behind the lead code, so that the condition that a tag sending end does not have excessive power consumption can be ensured, when the base station end can find out the exact start of packet transmission according to the lead code, the base station end simultaneously carries out fast Fourier transform on received information, and if data occur repeatedly at the frequency point, the tag corresponding to the data can be confirmed. Fig. 7 is a schematic diagram of a packet structure of query information according to an embodiment of the present invention, where crc (cyclic Redundancy check) denotes a cyclic Redundancy check, and a device number is a device identification number allocated to a tag by a base station, where the device number is used to distinguish different tags.
The embodiment of the invention amplifies the irradiation source signals sent by the base station through the tunnel diode, improves the transmission distance of the backscattering communication system, can orderly reflect the amplified irradiation source signals to the base station according to the resource distribution information sent by the base station, and can avoid collision and collision when the label is accessed into a channel, particularly in a large-scale label deployment scene, thereby improving the communication efficiency.
Example two
Referring to fig. 8, fig. 8 is a diagram of a backscatter communication method applied to a base station according to an embodiment of the present invention, where the method includes:
And step 802, obtaining the access request information fed back by the label.
Fig. 9 is a flowchart illustrating steps of accessing a base station by a tag according to an embodiment of the present invention. Firstly, a base station sends query information to a label; indicating that the label feeds back the access request information; thirdly, the base station sends resource allocation information to the label; and fourthly, the label feeds back reply information to the base station.
Specifically, the process of establishing connection between the tag and the base station is as follows: assuming that N tags are connected with a base station, when an N +1 th tag wants to access the base station, one frequency point Δ f1 is reserved for sending a query, and the other frequency points are used for communication, as shown in fig. 9, the base station sends query information in a reserved frequency point period, when a wakeup receiver of the tag 1 receives the query information, the wakeup tag sends request access information, the base station receives the access request information, sends a query packet for allocating time slot resource information and frequency point resource information to the tag 1, and then the tag 1 sends back reply information, or ACK (acknowledgement character), according to the time slot resource information and the frequency point resource information, and when the base station receives ACK in the allocated time slot and frequency point, the tag 1 is added to an associated tag list. In addition, examples are: when a plurality of devices want to access the base station at the same time, an Aloha protocol can be used, specifically, the tag immediately sends access request information when receiving query information, determines that the access fails when the tag does not receive resource allocation information allocated to the tag by the base station, and sends the access request information again when the base station sends the query information next time after randomly waiting for a period of time until the access succeeds.
Optionally, after receiving the amplified illumination source signal sent by the signal reflector, the method further includes:
and step Z1, analyzing binary data carried by the amplified irradiation source signal according to the frequency point energy of the amplified irradiation source signal.
And step Z2, when the frequency point energy is greater than a preset threshold, determining that the binary data is 1. Or the like, or, alternatively,
and step Z3, when the frequency point energy is smaller than a preset threshold value, determining that the binary data is 0.
For example, when the radiation source signal frequency is f, and the square wave control switch component with the preset frequency Δ f is switched on and switched off, the amplified radiation source signal frequency is changed into f + Δ f frequency, the base station calculates f + Δ f frequency point energy, when the energy of the frequency point is greater than a preset threshold value, it is determined that the corresponding tag sends 1, otherwise, it is determined that 0 is sent. Because only one fast Fourier transform is needed, the complexity of the base station end receiver can be greatly reduced.
The embodiment of the invention amplifies the irradiation source signals sent by the base station through the tunnel diode, improves the transmission distance of the backscattering communication system, can orderly reflect the amplified irradiation source signals to the base station according to the resource distribution information sent by the base station, and can avoid collision and collision when the label is accessed into a channel, particularly in a large-scale label deployment scene, thereby improving the communication efficiency.
EXAMPLE III
Referring to fig. 10, fig. 10 is a schematic structural diagram of a backscatter communication device applied to a tag, where the backscatter communication device is applied to the tag, the tag is configured with a signal reflector and a wake-up receiver, the signal reflector is configured with a tunnel diode, and the device includes:
a first receiving module 1001, configured to receive query information sent by a base station.
A response module 1002, configured to send, by the wake-up receiver, access request information to the base station in response to the query information.
A second receiving module 1003, configured to receive resource allocation information sent by the base station, where the resource allocation information includes time slot resource information and frequency point resource information.
A first obtaining module 1004, configured to obtain an illumination source signal sent by a base station.
An amplifying module 1005 for amplifying the illumination source signal through the tunnel diode.
A reflection module 1006, configured to reflect the amplified illumination source signal to the base station according to the resource allocation information.
Example four
Referring to fig. 11, fig. 11 is a schematic structural diagram of a backscatter communication device applied to a base station according to an embodiment of the present invention, where the backscatter communication device is applied to a base station, and the device includes:
a first sending module 1101, configured to send query information to a plurality of tags.
A second obtaining module 1102, configured to obtain access request information sent by the tag.
A second sending module 1103, configured to send resource allocation information to the tag, where the resource allocation information includes: time slot resource information and frequency point resource information.
A third transmitting module 1104 for transmitting the illumination source signal to the tag.
A third receiving module 1105, configured to receive the amplified illumination source signal sent by the signal reflector according to the resource allocation information.
EXAMPLE five
Referring to fig. 12, fig. 12 is a schematic structural diagram of a backscatter communication system according to an embodiment of the present invention, where Tx represents a transmission signal and Rx represents a reception signal. The system comprises: the system comprises a base station and a plurality of tags, wherein the tags are provided with a signal reflector and a wake-up receiver, and the signal reflector is provided with a tunnel diode.
The label includes: the device comprises a first receiving module, a response module, a second receiving module, a first obtaining module, an amplifying module and a reflecting module.
The first receiving module is used for receiving the query information sent by the base station.
And the response module is used for responding the inquiry information by the awakening receiver and sending access request information to the base station.
The second receiving module is configured to receive resource allocation information sent by the base station, where the resource allocation information includes time slot resource information and frequency point resource information.
The first obtaining module is configured to obtain an illumination source signal sent by a base station.
The amplification module is used for amplifying the irradiation source signal through the tunnel diode.
And the reflection module is used for reflecting the amplified illumination source signal to a base station by the signal reflector according to the resource allocation information.
The base station includes: the device comprises a first sending module, a second obtaining module, a second sending module, a third sending module and a third receiving module.
The first sending module is used for sending query information to the plurality of labels.
And the second acquisition module is used for acquiring the access request information fed back by the label.
The second sending module is configured to send resource allocation information to the tag, where the resource allocation information includes: time slot resource information and frequency point resource information.
The third sending module is configured to send an illumination source signal to the tag to obtain an amplified illumination source signal.
The third receiving module is configured to receive the amplified illumination source signal sent by the signal reflector according to the resource allocation information.
For the apparatus/system embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to some descriptions of the method embodiment for relevant points.
It should be noted that, the apparatus and the system according to the embodiments of the present invention are respectively an apparatus and a system applying the above-mentioned backscatter communication method, and all embodiments of the backscatter communication method are applicable to the apparatus and the system and can achieve the same or similar beneficial effects.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A backscatter communication method applied to a tag, the tag being configured with a signal reflector and a wake-up receiver, the signal reflector being configured with a tunnel diode, the method comprising:
receiving query information sent by a base station;
the awakening receiver responds to the inquiry information and sends access request information to the base station;
receiving resource allocation information sent by the base station, wherein the resource allocation information comprises time slot resource information and frequency point resource information;
acquiring an irradiation source signal sent by a base station;
amplifying, by the tunnel diode, the illumination source signal;
and according to the resource allocation information, the signal reflector reflects the amplified illumination source signal to a base station.
2. The method of claim 1, wherein the signal reflector is configured with a bias voltage module for applying a bias voltage to the tunnel diode through which the illumination source signal is amplified, comprising:
controlling the impedance Z of the tunnel diodeLAnd an antenna input impedance ZAMatch, expressed as:
XA＝-XL，
wherein, XLIs ZLImaginary part of, XAIs ZAAn imaginary part of (d);
obtaining a reflection coefficient expression expressed as:
adjusting the bias voltage to a preset value range through the bias voltage module, wherein the preset value range is used for controlling the tunnel diode to present negative impedance characteristics;
when the tunnel diode exhibits negative impedance characteristics, determining a reflection coefficient according to the reflection coefficient expression, expressed as:
wherein, R isLIs ZLReal part of (R)AIs ZAThe real part of (a);
amplifying the illumination source signal according to the reflection coefficient.
3. The method of claim 2, wherein the illumination source signal corresponds to a predetermined illumination source frequency, and wherein after amplifying the illumination source signal according to the reflection coefficient, the method further comprises:
controlling the real part R of the impedance of the tunnel diodeLAnd the real part R of the input impedance of the antennaAEqualising to cause said tunnel diode to oscillate, denoted as:
RA＝RL；
and locking the oscillation frequency generated by the tunnel diode to the preset irradiation source frequency through injection locking.
4. The method of claim 1, wherein the signal reflector comprises a switch assembly and a single chip, and wherein reflecting the amplified illumination source signal to a base station according to the resource allocation information comprises:
when the single chip microcomputer outputs square waves with preset fixed frequency, the switch assembly enters an open-close state, and meanwhile, the signal reflector generates binary data 1; or the like, or, alternatively,
when the single chip microcomputer stops outputting square waves with preset fixed frequency, the signal reflector generates binary data 0;
and according to the resource allocation information, the signal reflector reflects the amplified illumination source signal carrying binary data to a base station.
5. A backscatter communication method, applied to a base station, the method comprising:
sending query information to a plurality of tags;
acquiring access request information sent by the label;
sending resource allocation information to the tag, wherein the resource allocation information comprises: time slot resource information and frequency point resource information;
transmitting an illumination source signal to the tag to obtain an amplified illumination source signal;
receiving the amplified illumination source signal reflected by the signal reflector according to the resource allocation information.
6. The method of claim 5, wherein after said receiving said amplified illumination source signal transmitted by said signal reflector, said method further comprises:
analyzing binary data carried by the amplified irradiation source signal according to the frequency point energy of the amplified irradiation source signal;
when the frequency point energy is larger than a preset threshold value, determining that the binary data is 1; or the like, or, alternatively,
and when the frequency point energy is smaller than a preset threshold value, determining that the binary data is 0.
7. A backscatter communications device for use with a tag, the tag configured with a signal reflector and a wake-up receiver, the signal reflector configured with a tunnel diode, the device comprising:
the first receiving module is used for receiving query information sent by a base station;
a response module, configured to send access request information to the base station in response to the query information by the wake-up receiver;
a second receiving module, configured to receive resource allocation information sent by the base station, where the resource allocation information includes time slot resource information and frequency point resource information;
the first acquisition module is used for acquiring an irradiation source signal sent by a base station;
the amplification module is used for amplifying the irradiation source signal through the tunnel diode;
and the reflection module is used for reflecting the amplified irradiation source signal to a base station by the signal reflector according to the resource allocation information.
8. A backscatter communication apparatus, for use in a base station, the apparatus comprising:
the first sending module is used for sending query information to the plurality of labels;
the second acquisition module is used for acquiring the access request information sent by the label;
a second sending module, configured to send resource allocation information to the tag; wherein the resource allocation information comprises: time slot resource information and frequency point resource information;
a third sending module, configured to send an illumination source signal to the tag, so as to obtain an amplified illumination source signal;
a third receiving module, configured to receive the amplified illumination source signal sent by the signal reflector according to the resource allocation information.
9. A backscatter communication system, the system comprising: the system comprises a base station and a tag, wherein the tag is provided with a signal reflector and a wake-up receiver, and the signal reflector is provided with a tunnel diode;
the label includes: the device comprises a first receiving module, a response module, a second receiving module, a first obtaining module, an amplifying module and a reflecting module;
the first receiving module is used for receiving query information sent by a base station;
the response module is used for responding the inquiry information by the awakening receiver and sending access request information to the base station;
the second receiving module is configured to receive resource allocation information sent by the base station, where the resource allocation information includes time slot resource information and frequency point resource information;
the first acquisition module is used for acquiring an irradiation source signal sent by a base station;
the amplification module is used for amplifying the irradiation source signal through the tunnel diode;
the reflection module is used for reflecting the amplified irradiation source signal to a base station by the signal reflector according to the resource allocation information;
the base station includes: the device comprises a first sending module, a second obtaining module, a second sending module, a third sending module and a third receiving module;
the first sending module is used for sending query information to the plurality of labels;
the acquisition module is used for acquiring the access request information sent by the label;
the second sending module is configured to send resource allocation information to the tag; wherein the resource allocation information comprises: time slot resource information and frequency point resource information;
the third sending module is configured to send an illumination source signal to the tag to obtain an amplified illumination source signal;
the third receiving module is configured to receive the amplified illumination source signal sent by the signal reflector according to the resource allocation information.
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