CN108631906A - A kind of information transferring method, transmitting terminal, receiving terminal and environment backscatter system - Google Patents

A kind of information transferring method, transmitting terminal, receiving terminal and environment backscatter system Download PDF

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Publication number
CN108631906A
CN108631906A CN201710153129.XA CN201710153129A CN108631906A CN 108631906 A CN108631906 A CN 108631906A CN 201710153129 A CN201710153129 A CN 201710153129A CN 108631906 A CN108631906 A CN 108631906A
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China
Prior art keywords
channel information
transmission device
receiving end
transmission
wireless frame
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CN201710153129.XA
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Chinese (zh)
Inventor
王衍文
王公仆
位宁
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ZTE Corp
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ZTE Corp
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Priority to CN201710153129.XA priority Critical patent/CN108631906A/en
Publication of CN108631906A publication Critical patent/CN108631906A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H04L1/0008—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
    • 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
    • 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
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A kind of information transferring method of disclosure offer, transmitting terminal, receiving terminal and environment backscatter system, this method include：Transmitting terminal sends the first radio frames to the receiving terminal respectively by L transmitting device, wherein the transmitting terminal includes the L transmitting device, and L is the positive integer more than or equal to 2；The transmitting terminal receives the second radio frames that the receiving terminal is sent, wherein second radio frames are generated by the first radio frames of the receiving terminal based on reception；The transmitting terminal determines that at least one transmitting device is object transmission device according to second radio frames in the L transmitting device；The transmitting terminal sends third radio frames by the object transmission device to the receiving terminal.The information transferring method that the embodiment of the present disclosure provides, in environment backscatter system message transmitting procedure, optimal transmitting device can be selected to be transmitted into row information with receiving terminal from multiple transmitting devices, can effectively improve the reliability of information transmission and reduce the bit error rate.

Description

Information transmission method, sending end, receiving end and environment backscattering system
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to an information transmission method, a transmitting end, a receiving end, and an environment backscatter system.
Background
The environment backscattering technology is a new thing, obtains energy by utilizing existing wireless signals at the periphery and carries out communication, can enable a sensor to get rid of the constraint of a battery, avoids frequent manual maintenance operation, has the characteristics of wireless convenience and low energy consumption of green communication, has wide application prospect in related products of Radio Frequency Identification (RFID) systems and the industry of Internet of things, and is a wireless technology with important commercial value and development potential.
Current environmental backscatter systems typically transmit information between a transmitting device and a receiving end that can receive the transmitting device, such as: the tag and the card reader are influenced by the environment, so that the information transmitted between the transmission device and the receiving end is unstable, and the problems of low reliability of information transmission and high error rate exist in the information transmission process of an environment backscattering system.
Disclosure of Invention
The embodiment of the disclosure aims to provide an information transmission method, which improves the reliability of information transmission of an environmental backscattering system in an information transmission process and reduces an error rate.
In order to achieve the above object, an embodiment of the present disclosure provides an information transmission method, where the information transmission method includes:
a sending end sends a first wireless frame to a receiving end through L transmission devices respectively, wherein the sending end comprises the L transmission devices, and L is a positive integer greater than or equal to 2;
the sending end receives a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame;
the sending end determines at least one transmission device in the L transmission devices as a target transmission device according to the second wireless frame;
and the sending end sends a third wireless frame to the receiving end through the target transmission device.
The embodiment of the present disclosure further provides an information transmission method, where the information transmission method includes:
a receiving end receives a first wireless frame sent by a sending end through L transmission devices, wherein the sending end comprises the L transmission devices, and L is a positive integer greater than or equal to 2;
the receiving end sends a second wireless frame to the sending end based on the first wireless frame sent by the sending end;
and the receiving end receives a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in the L transmission devices.
The embodiment of the present disclosure further provides a transmitting end, including L transmission devices, where L is a positive integer greater than or equal to 2, and the transmitting end further includes:
a first wireless frame sending module, configured to send, by the sending end, first wireless frames to a receiving end through the L transmission devices, respectively;
a second radio frame receiving module, configured to receive, by the sending end, a second radio frame sent by the receiving end, where the second radio frame is generated by the receiving end based on a received first radio frame;
a determining module, configured to determine, by the sending end, at least one transmission device among the L transmission devices as a target transmission device according to the second wireless frame;
and the third wireless frame sending module is used for sending a third wireless frame to the receiving end by the sending end through the target transmission device.
The embodiment of the present disclosure further provides a sending end, including:
a first radio frame receiving module, configured to receive, by the receiving end, a first radio frame sent by a sending end through L transmission devices, where the sending end includes the L transmission devices, and L is a positive integer greater than or equal to 2;
a second wireless frame sending module, configured to send, by the receiving end, a second wireless frame to the sending end based on the first wireless frame sent by the sending end;
a third radio frame receiving module, configured to receive, by the receiving end, a third radio frame sent by the sending end through a target transmission device, where the target transmission device is at least one transmission device of the L transmission devices, and the transmission device is determined based on the second radio frame.
The disclosed embodiments also provide an ambient backscatter system, comprising:
a transmitting end, the transmitting end includes L transmission devices, L is a positive integer greater than or equal to 2, and is used for:
respectively sending first wireless frames to the receiving end through the L transmission devices;
receiving a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame;
determining, in the L transmission devices, at least one transmission device as a target transmission device according to the second radio frame;
sending a third wireless frame to the receiving end through the target transmission device;
a receiving end configured to:
receiving a first radio frame sent by the sending end through the L transmission devices;
transmitting a second wireless frame to the transmitting end based on the first wireless frame transmitted by the transmitting end;
and receiving a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in the L transmission devices.
The embodiment of the present disclosure further provides a storage medium, where one or more programs executable by the transmitting end or the receiving end are stored in the storage medium, and when the one or more programs are executed by the transmitting end or the receiving end, the transmitting end or the receiving end is enabled to execute the information transmission method provided above.
One of the above technical solutions has the following advantages or beneficial effects:
the sending end sends a first wireless frame to the receiving end through L transmission devices respectively; the sending end receives a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame; the sending end determines at least one transmission device in the L transmission devices as a target transmission device according to the second wireless frame; and the sending end sends a third wireless frame to the receiving end through the target transmission device. Therefore, in the information transmission process of the environmental backscattering system, the optimal transmission device and the receiving end can be selected from the plurality of transmission devices for information transmission, so that the reliability of information transmission can be effectively improved, and the error rate can be reduced.
Drawings
Fig. 1 is a schematic flowchart of an information transmission method according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of another information transmission method according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of another information transmission method according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of another information transmission method according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of an environmental backscatter system according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a communication process at a receiving end according to an embodiment of the present disclosure;
fig. 7 is a comparison graph of the theoretical value of the bit error rate and the simulated value provided by the embodiment of the disclosure;
fig. 8 is a graph comparing the performance of an information transmission method provided by the embodiment of the present disclosure with that of a conventional method;
fig. 9 is a schematic structural diagram of a transmitting end according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a determining module at a transmitting end according to an embodiment of the present disclosure;
fig. 11 is a schematic structural diagram of a receiving end according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of a second wireless frame sending module at a receiving end according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a second wireless frame sending module at a receiving end according to another embodiment of the present disclosure;
fig. 14 is a schematic structural diagram of another ambient backscatter system provided by an embodiment of the present disclosure.
Detailed Description
To make the technical problems, technical solutions and advantages to be solved by the present disclosure clearer, the following detailed description is made with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an embodiment of the present disclosure provides a flow diagram of an information transmission method, where the information transmission method includes the following steps:
step S101, the sending end sends a first wireless frame to the receiving end through L transmission devices, respectively, where the sending end includes L transmission devices, and L is a positive integer greater than or equal to 2.
In this embodiment of the present disclosure, in step S101, when L transmission devices receive a radio frequency signal, each transmission device sends a first radio frame to a receiving end; or when L transmission apparatuses receive the radio frequency signal, the L transmission apparatuses are controlled by the processor at the transmitting end to transmit the first radio frame to the receiving end. The first radio frame may be a signal transmitted by a transmitting apparatus to a receiving end, for example: taking the transmission device as a tag and the receiving end as a card reader as an example, the first wireless frame may be a radio frequency signal directly reflected to the card reader by the tag; or the radio frequency signal transmitted to the card reader by the tag after receiving the radio frequency signal.
The L transmission apparatuses respectively transmit the first radio frame to the receiving end, where the L transmission apparatuses sequentially transmit the first radio frame to the receiving end in a time division multiplexing manner, that is, at different times of the same frequency; the L transmission apparatuses may also transmit the first radio frame to the receiving end in a frequency division multiplexing manner, that is, at different frequencies. Of course, the L transmission apparatuses may also respectively send the first radio frame to the receiving end by other manners, for example: the method is not limited herein, and may be a code division multiplexing method.
Step S102, the sending end receives a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame.
In the embodiment of the present disclosure, when the receiving end receives the first wireless frames sent by the L transmission devices, the receiving end may collect target information of the receiving end when receiving each first wireless frame, for example: channel information or signal strength, etc., i.e., L pieces of target information can be received by the receiving end, and each piece of target information corresponds to each transmitting device.
The second wireless frame is generated by the receiving end based on the received first wireless frame, and the L collected target information may be sent through the second wireless frame; or the receiving end compares the L pieces of target information, determines an optimal transmission device from the L pieces of target information, and sends related information of the optimal transmission device to the sending end through a second wireless frame, for example: and sending the serial number of the transmission device corresponding to the maximum signal intensity in the L signal intensities to the sending end through the second wireless frame.
Step S103, the sending end determines at least one transmission device among the L transmission devices as a target transmission device according to the second radio frame.
In this embodiment, after the sending end receives the second wireless frame sent by the receiving end, the sending end may obtain information carried in the second wireless frame, and determine, from the information carried in the second wireless frame, at least one transmission device among L transmission devices as a target transmission device.
For example: if the receiving end sends the acquired L signal intensities to the sending end through the second wireless frame, the sending end can compare the signal intensities corresponding to the L transmission devices, and the transmission device corresponding to the signal intensity which is greater than a preset threshold value in the L signal intensities is used as a target transmission device; if the receiving end sends the determined sequence number of the optimal transmission device to the sending end through the second wireless frame, the sending end can directly determine the transmission device corresponding to the obtained sequence number as the target transmission device.
And step S104, the sending end sends a third wireless frame to the receiving end through the target transmission device.
In this embodiment, when the target transmission apparatus is determined in step S103, the sending end may control the target transmission apparatus to send a third wireless frame to the receiving end through the processor, where the third wireless frame carries the content stored in the target transmission apparatus.
It should be noted that the information transmission method may be applied to an environmental backscatter system including the transmitting end and the receiving end, for example: the environmental backscatter system including a plurality of tags and one or more readers can be applied to other systems or apparatuses that can transmit information by the above-mentioned information transmission method, and is not limited herein.
In the embodiment of the disclosure, a sending end sends first wireless frames to a receiving end through L transmission devices respectively; the sending end receives a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame; the sending end determines at least one transmission device as a target transmission device in the L transmission devices according to the second wireless frame; and the sending end sends the third wireless frame to the receiving end through the target transmission device. Therefore, in the information transmission process of the environmental backscattering system, the optimal transmission device and the receiving end can be selected from the plurality of transmission devices for information transmission, so that the reliability of information transmission can be effectively improved, and the error rate can be reduced.
As shown in fig. 2, an embodiment of the present disclosure provides a flow diagram of an information transmission method, where the information transmission method includes:
step S201, the sending end sends the first radio frame to the receiving end through L transmission devices, respectively, where the sending end includes L transmission devices, and L is a positive integer greater than or equal to 2.
In this embodiment of the present disclosure, in step S201, when L transmission devices receive a radio frequency signal, each transmission device sends a first radio frame to a receiving end; or when L transmission apparatuses receive the radio frequency signal, the L transmission apparatuses are controlled by the processor at the transmitting end to transmit the first radio frame to the receiving end.
Optionally, step S201 may include: the sending end sends the first wireless frames to the receiving end respectively in a time division multiplexing or frequency division multiplexing mode through the L transmission devices, so that the receiving end can accurately acquire channel information corresponding to each first wireless frame when receiving the first wireless frames of the L transmission devices, errors in the process of selecting the optimal transmission device can be avoided, the reliability of information transmission is further improved, and the error rate is reduced.
It should be noted that the sending end may only include L transmission apparatuses, and then the step S201 may be that the L transmission apparatuses respectively and spontaneously send the first wireless frame to the receiving end when receiving the radio frequency signal; of course, the sending end may further include at least L transmission devices and a processor, and the step S201 may be that the sending end controls the L transmission devices to respectively send the first radio frame to the receiving end through the processor.
Step S202, the sending end receives a second radio frame sent by the receiving end, where the second radio frame is generated by the receiving end based on the received first radio frame.
In the embodiment of the present disclosure, when the receiving end receives the first wireless frames sent by the L transmission devices, the receiving end may collect channel information of the receiving end when receiving each first wireless frame, and send the collected L channel information to the sending end through the second wireless frame.
The sending end receives the second wireless frame sent by the receiving end, wherein each transmission device in the sending end directly receives the second wireless frame sent by the receiving end; the sending end may also be configured to, when receiving the second wireless frame sent by the receiving end, transfer the second wireless frame to a processor therein, or transfer the second wireless frame to a part or all of the transmission apparatuses by the processor, which is not limited herein.
Step S203, the sending end obtains initial channel information and kth channel information in a second wireless frame, wherein the initial channel information is the channel information collected by the receiving end when the L transmission devices do not send the first wireless frame; the kth channel information is channel information acquired by a receiving terminal when the receiving terminal receives a first wireless frame sent by a kth transmission device; and k ∈ (1, 2, …, L).
In this embodiment, when the sending end receives the second wireless frame sent by the receiving end, the sending end may obtain initial channel information and kth channel information in the second wireless frame.
Certainly, if the sending end at least includes a processor and L transmission devices, the sending end obtains the initial channel information and the kth channel information in the second wireless frame, which may be obtained by the processor of the sending end reading the information in the second wireless frame; if the sending end at least comprises a processor and L transmission devices, the sending end acquires initial channel information and kth channel information in the second wireless frame, and the acquisition of the information in the second wireless frame by each transmission device can be realized by reading the information.
Step S204, the sending end determines at least one transmission device as a target transmission device in the L transmission devices according to the initial channel information and the kth channel information.
In this disclosure, in step S204, the sending end may compare the channel information corresponding to the L transmission devices with the initial channel information, determine whether the comparison result meets a preset condition, and determine that a certain transmission device is a target transmission device if the comparison result of the channel information corresponding to the transmission device and the initial channel information meets the preset condition.
For example: the sending end can respectively calculate the similarity between the channel information corresponding to the L transmission devices and the initial channel information, and if the similarity between the kth channel information and the initial channel information is greater than or equal to a preset similarity threshold, the transmission device corresponding to the kth channel information can be determined as a target transmission device.
Optionally, step S203 may include: the transmitting end compares the difference between the kth channel information and the initial channel information, and determines the transmission device corresponding to the largest difference in the L transmission devices as the target transmission device, so that the accuracy of obtaining the target transmission device, namely the optimal transmission device, can be improved, the reliability of information transmission is further improved, and the error rate is reduced.
It should be noted that, if the sending end at least includes a processor and L transmission devices, the step S204 may be executed by the processor; if the transmitting end only includes L transmission devices, step S204 may be executed by each transmission device that receives the second wireless frame, and the transmission device that satisfies the predetermined condition may determine itself as the target transmission device.
Wherein the difference is used to measure the difference between the kth channel information and the initial channel information, for example: the larger the absolute value of the difference between the squares of the absolute values of the two pieces of channel information is, the larger the degree of difference between the two pieces of channel information is, otherwise, the smaller the degree of difference is.
In addition, the difference may be obtained by calculating the kth channel information and the initial channel information by using a difference, a ratio, an euclidean distance, or a minkowski distance, for example: if the kth channel information and the initial channel information are both one-dimensional variables, calculating the difference degree through the difference value or the ratio of the kth channel information and the initial channel information; if the kth channel information and the initial channel information are both multidimensional variables, the difference degree and the like can be calculated through the Euclidean distance between the kth channel information and the initial channel information.
In addition, if the second wireless frame in step S202 carries the related information of the optimal transmission device determined by the receiving end, for example: a serial number of the transmission device, and optionally, step S203 and step S204 may be replaced with: the sending end obtains the relevant information in the second wireless frame, and takes the transmission device corresponding to the relevant information as a target transmission device, wherein the relevant information is the information of the transmission device of the information to be transmitted determined in the L transmission devices according to the first wireless frame respectively sent by the receiving end through the L transmission devices, so that the sending end can rapidly determine the target transmission device, and the information transmission efficiency is improved.
Step S205, the transmitting end transmits a third wireless frame to the receiving end through the target transmission apparatus.
In the embodiment of the disclosure, when determining the target transmission apparatus, the sending end may control the target transmission apparatus to send a third wireless frame to the receiving end through the processor and the like, where the third wireless frame carries content stored in the target transmission apparatus.
According to the embodiment of the disclosure, the sending end determines at least one transmission device as a target transmission device among the L transmission devices by acquiring the initial channel information and the kth channel information in the second wireless frame according to the initial channel information and the kth channel information, and sends the third wireless frame to the receiving end through the target transmission device, so that the information of the optimal transmission device among the plurality of transmission devices can be transmitted to the receiving end, the reliability of information transmission can be effectively improved, and the error rate can be reduced.
As shown in fig. 3, an embodiment of the present disclosure provides a flow diagram of an information transmission method, where the information transmission method includes:
step S301, a receiving end receives a first radio frame sent by a sending end through L transmission devices, where the sending end includes the L transmission devices, and L is a positive integer greater than or equal to 2.
In this embodiment, when the sending end sends the first wireless frame to the receiving end, the receiving end may receive the first wireless frames sent by the L transmission apparatuses, respectively.
Step S302, the receiving end transmits a second radio frame to the transmitting end based on the first radio frame transmitted by the transmitting end.
In the embodiment of the present disclosure, if receiving first wireless frames respectively received from L transmission devices, a receiving end may collect target information of the receiving end when receiving each first wireless frame, for example: channel information or signal strength, etc., i.e., L pieces of target information can be received by the receiving end, and each piece of target information corresponds to each transmitting device.
The sending end sends the first wireless frame to the sending end, and the first wireless frame is sent to the sending end; or the receiving end compares the L pieces of target information, determines an optimal transmission device from the L pieces of target information, and sends related information of the optimal transmission device to the sending end through a second wireless frame, for example: and sending the serial number of the transmission device corresponding to the maximum signal intensity in the L signal intensities to the sending end through the second wireless frame.
Step S303, the receiving end receives a third wireless frame sent by the sending end through the target transmission device, where the target transmission device is at least one transmission device determined based on the second wireless frame in the L transmission devices.
In this embodiment, if the sending end receives the second wireless frame and determines the target transmission device, the sending end may send a third wireless frame to the receiving end through the target transmission device, and the receiving end receives the third wireless frame, and may obtain the content transmitted by the target transmission device.
In the embodiment of the disclosure, a receiving end receives a first wireless frame sent by a sending end through L transmission devices; the receiving end sends a second wireless frame to the sending end based on the first wireless frame sent by the sending end; and the receiving end receives a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in L transmission devices. Therefore, in the information transmission process of the environmental backscattering system, the optimal transmission device and the receiving end can be selected from the plurality of transmission devices for information transmission, so that the reliability of information transmission can be effectively improved, and the error rate can be reduced.
As shown in fig. 4, an embodiment of the present disclosure provides a flowchart of an information transmission method, where the information transmission method includes the following steps:
step S401, a receiving end receives a first radio frame sent by a sending end through L transmission devices, where the sending end includes the L transmission devices, and L is a positive integer greater than or equal to 2.
In the embodiment of the present disclosure, the L transmission apparatuses send the first wireless frame to the receiving end, and may adopt time division multiplexing or frequency division multiplexing.
Step S402, a receiving end collects initial channel information and kth channel information, wherein the initial channel information is the channel information when no first wireless frame is sent by L transmission devices; the kth channel information is the channel information when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L).
In this embodiment of the present disclosure, the sending end may collect kth channel information when receiving a first wireless frame sent by a kth transmission device, and initial channel information when none of the L transmission devices sends the first wireless frame.
It should be noted that, when L transmission apparatuses send a first radio frame to a receiving end in a time division multiplexing manner, the receiving end can directly obtain k pieces of channel information corresponding to L first radio frames from L separated signals, i.e., the first radio frames, at the receiving end; when the L transmission devices send the first wireless frames to the receiving end in a frequency division multiplexing mode, the L first wireless frames are coupled into a mixed signal, and the receiving end can separate the mixed signal into L separated signals through the filtering device, so that the L separated signals respectively acquire the channel information corresponding to the L transmission devices.
Step S403, the receiving end sends the initial channel information and the kth channel information to the sending end through the second wireless frame.
In this disclosure, if the initial channel information and the kth channel information are obtained in step S402, the receiving end may send the initial channel information and the kth channel information to the sending end in the second wireless frame.
Optionally, step S402 and step S403 may be replaced by:
the method comprises the steps that a receiving end collects initial channel information and kth channel information, wherein the initial channel information is the channel information when L transmission devices do not send a first wireless frame; the kth channel information is the channel information when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L);
the receiving end determines at least one transmission device as a transmission device of information to be transmitted in L transmission devices according to the initial channel information and the kth channel information;
and the receiving end sends the related information of the transmission device of the information to be transmitted to the sending end through the second wireless frame.
The receiving end determines at least one transmission device as a transmission device of information to be transmitted in the L transmission devices according to the initial channel information and the kth channel information, and may compare the channel information corresponding to the L transmission devices with the initial channel information, respectively, determine whether a comparison result meets a preset condition, and determine that a transmission device is a target transmission device if the comparison result of the channel information corresponding to a certain transmission device and the initial channel information meets the preset condition, thereby increasing the speed of determining the target transmission device and increasing the efficiency of information transmission.
For example: the receiving end may calculate similarities between the channel information corresponding to the L transmission devices and the initial channel information, respectively, and if the similarity between the kth channel information and the initial channel information is greater than or equal to a preset similarity threshold, it may be determined that the transmission device corresponding to the kth channel information is the target transmission device.
Further optionally, the step of determining, by the receiving end, at least one transmission device as a transmission device of information to be transmitted in L transmission devices according to the initial channel information and the kth channel information includes: the receiving end compares the difference between the kth channel information and the initial channel information, and determines the transmission device corresponding to the maximum difference among the L transmission devices as the target transmission device, so that the accuracy of obtaining the target transmission device, namely the optimal transmission device, can be improved, the reliability of information transmission is further improved, and the error rate is reduced.
Step S404, the receiving end receives a third wireless frame sent by the sending end through the target transmission device, where the target transmission device is at least one transmission device determined based on the second wireless frame among the L transmission devices.
In this embodiment, if the sending end receives the second wireless frame and determines the target transmission device, the sending end may send a third wireless frame to the receiving end through the target transmission device, and the receiving end receives the third wireless frame, and may obtain the content transmitted by the target transmission device.
According to the embodiment of the disclosure, a receiving end collects initial channel information and kth channel information; sending the initial channel information and the kth channel information to a sending end through a second wireless frame; and the third wireless frame sent by the sending end through the target transmission device is received, so that the information of the optimal transmission device in the plurality of transmission devices can be transmitted to the receiving end, the reliability of information transmission can be effectively improved, and the error rate can be reduced.
In addition, the embodiment of the present disclosure further explains the provided information transmission method in practical application, as shown in fig. 5 to 8, the environment backscatter system may include a radio frequency source, L tags, and a card reader as an example, that is, the L tags form a transmitting end, and the card reader is a receiving end, where:
each process of information transmission between the L tags and the card reader can be considered to be carried out in one time slot, and each time slot can be divided into three stages according to the signal transmission of the card reader, namely a first sub-time slot, a second sub-time slot and a third sub-time slot, wherein the first sub-time slot is used for the card reader to acquire initial channel information and kth channel information; the second sub-time slot is that the card reader sends a second wireless frame to the L labels according to the initial identification information and the kth channel information; the third sub-slot is a third wireless frame, namely transmitted information, sent by the target tag received by the card reader.
In the first sub-time slot, the radio frequency source of the present disclosure may repeat transmission of the same signal N multiple times0And the number of times of repeated transmission is greater than or equal to L, the L tags can acquire energy through signals sent by the radio frequency source, and when the signals sent by the radio frequency source are received, the received signals are selected to be reflected or not reflected, and the received signals are expressed through 1 state and 0 state. The reflection or non-reflection of the received signal by the tag is achieved by changing its own resistance.
Wherein the same signal N is transmitted for the first time at the radio frequency source0In the secondary process, the L labels do not reflect signals, namely 0 is transmitted, and the card reader can acquire the initial signal of the channelStarting channel information; transmitting the same signal N at the k +1 th time of the radio frequency source0In the secondary process, the kth tag reflects signals, namely the kth tag transmits 1, the tags except the kth tag keep silent, namely transmit 0, and the card reader can acquire the kth channel information of the channel.
The card reader can be based on a distribution functionDetermining initial channel information hrInitial channel information hrSatisfy the requirement ofWherein,represents hrR is the r-th symbol sent by the radio frequency source, and r is a positive integer; the card reader can be based on the function muk＝hr+hkgkη determining the kth channel information mukWherein represents hkThe variance of (a); denotes gkη is the attenuation factor of the tag, and η is less than 1.
In the second sub-time slot, the reader may compare the difference between the kth channel information and the initial channel information, and determine the tag corresponding to the largest difference as the target tag. Since the lth channel information may reflect energy between the reader and the lth tag and between the reader and the rf source, the difference between the lth channel information and the initial channel information may reflect energy between the reader and the lth tag.
The smaller the difference between the L-th channel information and the initial channel information is, the lower the energy received by the card reader when the L-th tag reflects is, and the lower the reliability of information transmission between the card reader and the L-th tag is; the greater the difference between the lth channel information and the initial channel information is, the higher the energy received by the card reader when the lth tag reflects is, the higher the reliability of information transmission between the card reader and the lth tag is, and then, when the difference between the lth channel information and the initial channel information is the greatest when the lth tag reflects in the L tags, it is indicated that the information transmission between the lth tag and the card reader in the time slot is the most reliable, and the lth tag can be selected as the target tag.
In addition, the difference between the kth channel information and the initial channel information may be obtained by calculation using an euclidean distance or the like. For example: the difference between the kth channel information and the initial channel information is | | muk|2-|hr|2|。
The embodiment of the present disclosure further verifies an information transmission method of the environmental backscatter system, where:
when the radio frequency source transmits the nth symbol and n is a positive integer, the channel information between the radio frequency source and the kth label is hkThe channel information between the radio frequency source and the card reader, i.e. the initial channel information, is hrThe channel information between the reader and the kth tag is gkWherein CN (;) represents the distribution function, hk，hrAnd gkRespectively has a variance ofAndtwo states, i.e., a transmission 1 state and a transmission 0 state, can be represented by b (n) ═ 1 and b (n) ═ 0, respectively. The transmitted signal from the radio frequency source is denoted as s (n), the reader will receive the signals transmitted by the radio frequency source and the tag at the same time, and the received signal of the reader can be denoted as s (n)
y(n)＝hrs(n)+gkηhkBk(n)s(n)+w(n)
Wherein η is the attenuation factor of the label and η is less than 1, w (N) is white Gaussian noise and w (N) -CN (0, N)w)，NwIs the noise power.
When the kth label reflects the signal, the kth channel information of the card reader is set as mukSince the reader receives the signals transmitted by the RF source and the kth tag simultaneously, then μk＝hr+hkgkη in the first sub-slot, then the received signal of the reader can be further represented as
Wherein N is0The number of times of repeatedly transmitting the same signal for the radio frequency source in the first sub-time slot is multiple times, and the total number of symbols N transmitted by the radio frequency source in the first sub-time slotp＝(L+1)N0。
In the second sub-time slot, the card reader calculates the average energy phi of the received signal, assuming that the channel is unchanged in the same time slotkIs composed of
Wherein P issIs the average received power, L, of the RF source signal s (n)0、L1Is the crossing element of signal and noise, close to 0, | | is the modulus operator.
As can be seen from the above equation, based on the received energy, the reader is able to decode the signal transmitted from the tag. While the most important factor affecting the received energy of 0 and 1 is | hr|2And | μk|2. In order to reduce the error rate of signal detection as much as possible, a multi-label selection standard is set as
Wherein, the firstThe individual tags are the tags which are selected by the card reader from the L tags and have the maximum difference degree with the initial channel information, and all the tags are informed of the selection result.
In the third sub-time slot, the selected firstThe tag sends a signal to the reader. The final received signal of the card reader is
Wherein N is [ N ]P+NS+1,NP+NS+QNT]，NPIs the total number of symbols transmitted by the radio frequency source in the first sub-slot, and NP＝(K+1)N0；NSA total number of symbols transmitted at the second transmission for the radio frequency source; q is the number of the signals repeatedly transmitted by the radio frequency source in the third sub-time slot, and each signal is repeatedly transmitted by NtSub, NTTotal number of symbols transmitted in the third sub-slot for the RF source and NT＝Q×Nt。
q representsThe card reader obtainsThe q signal reflected by the tag is transmitted by NtNext, the process is carried out. Setting the signal to be detected asThe card reader estimates the average energy of the received reflected signal q
Wherein,
，indicating a correlation operation, wH(n) is represented as conjugate transpose of w (n), and finally the maximum likelihood detection theorem under the model is obtained
Whereinto detect the threshold, the intermediate variable Φ1(q)＝Φ(q)-Nw。
Within a time slot, channel information h is assumedk，gkAnd hrRemain unchanged, at different time slots, the channel changes, and it is assumed that the reader is knownChannel information. Then the bit error rate P in one time slotbThe final calculation is
Wherein α is the energy coefficient, anQ (.) is a Q function defined as
The intermediate variables M and N are respectively represented as
At different time slots, an approximate average bit error rate of
Whereinto representIs determined by the probability density function of (a),assuming L is the maximum tag number, then there is
Therefore, a comparison between the theoretical value and the simulated value of the bit error rate as shown in fig. 7 and a new comparison between the information transmission method provided by the embodiment of the disclosure as shown in fig. 8, i.e., the new method, and the conventional method can be obtained. As shown in fig. 7, it can be known that a Bit Error Rate (BER) theoretical value in the information transmission method of the present disclosure is close to a simulated value, and as shown in fig. 8, when the tag selected by the information transmission method of the present disclosure is used for transmitting information with a card reader, the reliability is higher than that of the conventional method, and as a Signal Noise Ratio (SNR) increases within a certain range, the new method has a lower BER than that of the conventional method, and can significantly reduce the BER and improve the reliability.
As shown in fig. 9, an embodiment of the present disclosure provides a structural schematic diagram of a transmitting end, where the transmitting end 90 includes L transmission devices, L is a positive integer greater than or equal to 2, and the transmitting end 90 further includes:
a first radio frame sending module 91, configured to send a first radio frame to a receiving end through L transmission apparatuses respectively by a sending end;
a second wireless frame receiving module 92, configured to receive, by the sending end, a second wireless frame sent by the receiving end, where the second wireless frame is generated by the receiving end based on the received first wireless frame;
a determining module 93, configured to determine, by the sending end, at least one transmission device among the L transmission devices as a target transmission device according to the second wireless frame;
a third wireless frame sending module 94, configured to send the third wireless frame to the receiving end through the target transmission apparatus by the sending end.
Alternatively, as shown in fig. 10, the determining module 93 may include:
a channel information obtaining unit 931, configured to obtain, by the sending end, initial channel information and kth channel information in the second wireless frame, where the initial channel information is channel information that is collected by the receiving end when none of the L transmission devices sends the first wireless frame; the kth channel information is the channel information collected by the receiving end when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L);
a first determining unit 932, configured to determine, by the sending end, at least one transmission apparatus as a target transmission apparatus among the L transmission apparatuses according to the initial channel information and the kth channel information.
Optionally, the first determining unit 932 may be further configured to compare the difference between the kth channel information and the initial channel information at the sending end, and determine a transmission apparatus corresponding to the largest difference among the L transmission apparatuses as the target transmission apparatus.
The determining module 93 may be further configured to, by the sending end, obtain relevant information in the second wireless frame, and use the transmission device corresponding to the relevant information as a target transmission device, where the relevant information is information of a transmission device of information to be transmitted, which is determined in the L transmission devices, by the receiving end according to the first wireless frame respectively sent by the L transmission devices.
Optionally, the first radio frame sending module 91 may also be configured to send, by the sending end, the first radio frames to the receiving end in a time division multiplexing or frequency division multiplexing manner through the L transmission devices, respectively.
It should be noted that the sending end in this embodiment may be the sending end in the embodiment shown in fig. 1 to fig. 8, and any implementation of the sending end described in the embodiment shown in fig. 1 to fig. 8 may be implemented by the sending end, which is not described herein again.
In the embodiment of the disclosure, a sending end sends first wireless frames to a receiving end through L transmission devices respectively; receiving a second wireless frame sent by a receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame; determining at least one transmission device among the L transmission devices as a target transmission device according to the second wireless frame; and transmitting the third wireless frame to the receiving end through the target transmission device. Therefore, in the information transmission process of the environmental backscattering system, the optimal transmission device and the receiving end can be selected from the plurality of transmission devices for information transmission, so that the reliability of information transmission can be effectively improved, and the error rate can be reduced.
As shown in fig. 11, an embodiment of the present disclosure provides a schematic structural diagram of a receiving end, where the receiving end 110 includes:
a first radio frame receiving module 111, configured to receive, by a receiving end, a first radio frame sent by a sending end through L transmission devices, where the sending end includes the L transmission devices, and L is a positive integer greater than or equal to 2;
a second radio frame sending module 112, configured to send, by the receiving end, a second radio frame to the sending end based on the first radio frame sent by the sending end;
a third wireless frame receiving module 113, configured to receive, by the receiving end, a third wireless frame sent by the sending end through a target transmission device, where the target transmission device is at least one transmission device determined based on the second wireless frame among the L transmission devices.
Optionally, as shown in fig. 12, the second wireless frame sending module 112 may include:
a first acquiring unit 1121, configured to acquire, by a receiving end, initial channel information and kth channel information, where the initial channel information is channel information when none of the L transmission devices sends the first wireless frame; the kth channel information is the channel information when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L);
the first sending unit 1122 is configured to send the initial channel information and the kth channel information to the sending end through the second wireless frame by the receiving end.
Optionally, as shown in fig. 13, the second wireless frame sending module 112 may include:
a second acquiring unit 1123, configured to acquire, by a receiving end, initial channel information and kth channel information, where the initial channel information is channel information when none of the L transmission devices sends the first radio frame; the kth channel information is the channel information when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L);
a second determining unit 1124, configured to determine, by the receiving end, at least one transmission apparatus as a transmission apparatus of information to be transmitted in the L transmission apparatuses according to the initial channel information and the kth channel information;
the second sending unit 1125 is configured to send, by the receiving end, information related to the transmission apparatus of the information to be transmitted to the sending end through a second wireless frame.
Optionally, the second determining unit 1124 may be further configured to compare the difference between the kth channel information and the initial channel information at the receiving end, and determine the transmission apparatus with the largest difference among the L transmission apparatuses as the target transmission apparatus.
It should be noted that the receiving end in this embodiment may be the receiving end in the embodiments shown in fig. 1 to fig. 8, and any implementation of the receiving end described in the embodiments shown in fig. 1 to fig. 8 may be implemented by the receiving end, which is not described herein again.
In the embodiment of the disclosure, a receiving end receives a first wireless frame sent by a sending end through L transmission devices; sending a second wireless frame to the sending end based on the first wireless frame sent by the sending end; and receiving a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in the L transmission devices. Therefore, in the information transmission process of the environmental backscattering system, the optimal transmission device and the receiving end can be selected from the plurality of transmission devices for information transmission, so that the reliability of information transmission can be effectively improved, and the error rate can be reduced.
As shown in fig. 14, a schematic structural diagram of another environmental backscatter system provided in an embodiment of the present disclosure, the environmental backscatter system 140 includes:
the transmitting end 90, the transmitting end 90 includes L transmission devices, L is a positive integer greater than or equal to 2, and is configured to:
respectively sending a first wireless frame to a receiving end through L transmission devices;
receiving a second wireless frame sent by a receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame;
determining at least one transmission device among the L transmission devices as a target transmission device according to the second wireless frame;
sending a third wireless frame to a receiving end through the target transmission device;
a receiving end 110, configured to:
receiving a first wireless frame sent by a sending end through L transmission devices;
sending a second wireless frame to the sending end based on the first wireless frame sent by the sending end;
and receiving a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in the L transmission devices.
It should be noted that the sending end of this embodiment may be the sending end in the embodiment shown in fig. 1 to fig. 8, and any implementation of the sending end described in the embodiment shown in fig. 1 to fig. 8 may be implemented by the sending end; the receiving end of this embodiment may be the receiving end in the embodiments shown in fig. 1 to 8, and any implementation of the receiving end described in the embodiments shown in fig. 1 to 8 may be implemented by the receiving end, which is not described herein again.
In the embodiment of the disclosure, a sending end of an environment backscattering system sends first wireless frames to a receiving end through L transmission devices respectively; receiving first wireless frames sent by a sending end through L transmission devices, and sending second wireless frames to the sending end based on the first wireless frames sent by the sending end; and the sending end receives a second wireless frame sent by the receiving end, and determines at least one transmission device as a target transmission device in the L transmission devices according to the second wireless frame. Therefore, in the information transmission process of the environmental backscattering system, the optimal transmission device and the receiving end can be selected from the plurality of transmission devices for information transmission, so that the reliability of information transmission can be effectively improved, and the error rate can be reduced.
It will be understood by those skilled in the art that all or part of the steps of the method for implementing the above embodiments may be implemented by hardware associated with program instructions, and the program may be stored in a storage medium, and when executed, the program includes the following steps:
a sending end sends a first wireless frame to a receiving end through L transmission devices respectively, wherein the sending end comprises the L transmission devices, and L is a positive integer greater than or equal to 2;
the sending end receives a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame;
the sending end determines at least one transmission device as a target transmission device in the L transmission devices according to the second wireless frame;
and the sending end sends the third wireless frame to the receiving end through the target transmission device.
Optionally, the step of determining, by the sending end, at least one transmission device among the L transmission devices as a target transmission device according to the second radio frame includes:
the method comprises the steps that a sending end obtains initial channel information and kth channel information in a second wireless frame, wherein the initial channel information is the channel information collected by a receiving end when L transmission devices do not send a first wireless frame; the kth channel information is the channel information collected by the receiving end when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L);
and the sending end determines at least one transmission device as a target transmission device in the L transmission devices according to the initial channel information and the kth channel information.
Optionally, the step of determining, by the sending end, at least one transmission device as a target transmission device among the L transmission devices according to the initial channel information and the kth channel information includes:
and the transmitting end compares the difference between the kth channel information and the initial channel information and determines the transmission device corresponding to the maximum difference among the L transmission devices as a target transmission device.
Optionally, the step of determining, by the sending end, at least one transmission device among the L transmission devices as a target transmission device according to the second radio frame includes:
and the sending end acquires the related information in the second wireless frame and takes the transmission device corresponding to the related information as a target transmission device, wherein the related information is the information of the transmission device of the information to be transmitted determined in the L transmission devices according to the first wireless frame respectively sent by the receiving end through the L transmission devices.
Optionally, the step of sending, by the sending end, the first radio frame to the receiving end through the L transmission devices respectively includes:
the sending end sends the first wireless frame to the receiving end respectively in a time division multiplexing or frequency division multiplexing mode through L transmission devices.
The program, when executed, may further include the steps of:
a receiving end receives a first wireless frame sent by a sending end through L transmission devices, wherein the sending end comprises the L transmission devices, and L is a positive integer greater than or equal to 2;
the receiving end sends a second wireless frame to the sending end based on the first wireless frame sent by the sending end;
and the receiving end receives a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in L transmission devices.
Optionally, the step of sending, by the receiving end, the second radio frame to the sending end based on the first radio frame sent by the sending end includes:
the method comprises the steps that a receiving end collects initial channel information and kth channel information, wherein the initial channel information is the channel information when L transmission devices do not send a first wireless frame; the kth channel information is the channel information when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L);
and the receiving end sends the initial channel information and the kth channel information to the sending end through the second wireless frame.
Optionally, the step of sending, by the receiving end, the second radio frame to the sending end based on the first radio frame sent by the sending end includes:
the method comprises the steps that a receiving end collects initial channel information and kth channel information, wherein the initial channel information is the channel information when L transmission devices do not send a first wireless frame; the kth channel information is the channel information when the receiving end receives the first wireless frame sent by the kth transmission device; k ∈ (1, 2, …, L);
the receiving end determines at least one transmission device as a transmission device of information to be transmitted in L transmission devices according to the initial channel information and the kth channel information;
and the receiving end sends the related information of the transmission device of the information to be transmitted to the sending end through the second wireless frame.
Optionally, the step of determining, by the receiving end, at least one transmission device as a transmission device of information to be transmitted in the L transmission devices according to the initial channel information and the kth channel information includes:
and the receiving end compares the difference between the kth channel information and the initial channel information and determines the transmission device corresponding to the maximum difference among the L transmission devices as a target transmission device.
The storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk. While the foregoing is directed to the preferred embodiment of the present disclosure, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the disclosure, and it is intended that such changes and modifications be considered as within the scope of the disclosure.

Claims (19)

1. An information transmission method, characterized in that the information transmission method comprises:
a sending end sends a first wireless frame to a receiving end through L transmission devices respectively, wherein the sending end comprises the L transmission devices, and L is a positive integer greater than or equal to 2;
the sending end receives a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame;
the sending end determines at least one transmission device in the L transmission devices as a target transmission device according to the second wireless frame;
and the sending end sends a third wireless frame to the receiving end through the target transmission device.
2. The method of claim 1, wherein the step of the transmitting end determining at least one of the L transmission devices as a target transmission device according to the second radio frame comprises:
the sending end obtains initial channel information and kth channel information in the second wireless frame, wherein the initial channel information is the channel information collected by the receiving end when the L transmission devices do not send the first wireless frame; the kth channel information is channel information collected by the receiving terminal when the receiving terminal receives a first wireless frame sent by a kth transmission device; the k e (1, 2, …, L);
and the sending end determines at least one transmission device in the L transmission devices as the target transmission device according to the initial channel information and the kth channel information.
3. The method as claimed in claim 2, wherein the step of the transmitting end determining at least one transmission apparatus among the L transmission apparatuses as the target transmission apparatus according to the initial channel information and the kth channel information comprises:
and the transmitting end compares the difference between the kth channel information and the initial channel information, and determines the transmission device corresponding to the maximum difference in the L transmission devices as the target transmission device.
4. The method of claim 1, wherein the step of the transmitting end determining at least one of the L transmission devices as a target transmission device according to the second radio frame comprises:
the sending end obtains the related information in the second wireless frame, and takes the transmission device corresponding to the related information as the target transmission device, wherein the related information is the information of the transmission device of the information to be transmitted determined in the L transmission devices according to the first wireless frame respectively sent by the receiving end through the L transmission devices.
5. The method according to any one of claims 1 to 4, wherein the step of the transmitting end respectively transmitting the first radio frame to the receiving end through the L transmission apparatuses comprises:
the sending end sends the first wireless frames to the receiving end respectively in a time division multiplexing or frequency division multiplexing mode through the L transmission devices.
6. An information transmission method, characterized in that the information transmission method comprises:
a receiving end receives a first wireless frame sent by a sending end through L transmission devices, wherein the sending end comprises the L transmission devices, and L is a positive integer greater than or equal to 2;
the receiving end sends a second wireless frame to the sending end based on the first wireless frame sent by the sending end;
and the receiving end receives a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in the L transmission devices.
7. The method of claim 6, wherein the step of the receiving end transmitting a second radio frame to the transmitting end based on a first radio frame transmitted by the transmitting end comprises:
the receiving end collects initial channel information and kth channel information, wherein the initial channel information is channel information when the L transmission devices do not send the first wireless frame; the kth channel information is channel information when the receiving end receives a first wireless frame sent by a kth transmission device; the k e (1, 2, …, L);
and the receiving end sends the initial channel information and the kth channel information to the sending end through the second wireless frame.
8. The method of claim 6, wherein the step of the receiving end transmitting a second radio frame to the transmitting end based on a first radio frame transmitted by the transmitting end comprises:
the receiving end collects initial channel information and kth channel information, wherein the initial channel information is channel information when the L transmission devices do not send the first wireless frame; the kth channel information is channel information when the receiving end receives a first wireless frame sent by a kth transmission device; the k e (1, 2, …, L);
the receiving end determines at least one transmission device as a transmission device of information to be transmitted in the L transmission devices according to the initial channel information and the kth channel information;
and the receiving end sends the related information of the transmission device of the information to be transmitted to the sending end through the second wireless frame.
9. The method as claimed in claim 8, wherein the step of determining, by the receiving end, at least one transmission apparatus among the L transmission apparatuses as a transmission apparatus to transmit information according to the initial channel information and the kth channel information comprises:
and the receiving end compares the difference degree between the kth channel information and the initial channel information, and determines the transmission device corresponding to the maximum difference degree in the L transmission devices as the target transmission device.
10. The utility model provides a sending end, its characterized in that, the sending end includes L transmission device, and L is the positive integer that is more than or equal to 2, the sending end still includes:
a first wireless frame sending module, configured to send, by the sending end, first wireless frames to a receiving end through the L transmission devices, respectively;
a second radio frame receiving module, configured to receive, by the sending end, a second radio frame sent by the receiving end, where the second radio frame is generated by the receiving end based on a received first radio frame;
a determining module, configured to determine, by the sending end, at least one transmission device among the L transmission devices as a target transmission device according to the second wireless frame;
and the third wireless frame sending module is used for sending a third wireless frame to the receiving end by the sending end through the target transmission device.
11. The transmitting end of claim 10, wherein the determining module comprises:
a channel information obtaining unit, configured to obtain, by the sending end, initial channel information and kth channel information in the second wireless frame, where the initial channel information is channel information that is collected by the receiving end when none of the L transmission devices sends the first wireless frame; the kth channel information is channel information collected by the receiving terminal when the receiving terminal receives a first wireless frame sent by a kth transmission device; the k e (1, 2, …, L);
a first determining unit, configured to determine, by the sending end, at least one transmission device among the L transmission devices as the target transmission device according to the initial channel information and the kth channel information.
12. The transmitting end of claim 11, wherein the first determining unit is further configured to compare a difference between the kth channel information and the initial channel information by the transmitting end, and determine a transmission apparatus with a largest difference among the L transmission apparatuses as the target transmission apparatus.
13. The sending end of claim 10, wherein the determining module is further configured to, by the sending end, obtain relevant information in the second radio frame, and use a transmission apparatus corresponding to the relevant information as the target transmission apparatus, where the relevant information is information of a transmission apparatus to be transmitted, which is determined by the receiving end among the L transmission apparatuses, according to the first radio frame sent by the L transmission apparatuses, respectively.
14. The transmitting end according to any one of claims 10 to 13, wherein the first radio frame sending module is further configured to send, by the transmitting end, the first radio frame to the receiving end in a time division multiplexing manner or a frequency division multiplexing manner through the L transmission apparatuses, respectively.
15. A receiving end, comprising:
a first radio frame receiving module, configured to receive, by the receiving end, a first radio frame sent by a sending end through L transmission devices, where the sending end includes the L transmission devices, and L is a positive integer greater than or equal to 2;
a second wireless frame sending module, configured to send, by the receiving end, a second wireless frame to the sending end based on the first wireless frame sent by the sending end;
a third radio frame receiving module, configured to receive, by the receiving end, a third radio frame sent by the sending end through a target transmission device, where the target transmission device is at least one transmission device of the L transmission devices, and the transmission device is determined based on the second radio frame.
16. The receiving end of claim 15, wherein the second wireless frame transmitting module comprises:
a first collecting unit, configured to collect, by the receiving end, initial channel information and kth channel information, where the initial channel information is channel information when none of the L transmission devices sends a first radio frame; the kth channel information is channel information when the receiving end receives a first wireless frame sent by a kth transmission device; the k e (1, 2, …, L);
and the first sending unit is used for sending the initial channel information and the kth channel information to the sending end through the second wireless frame by the receiving end.
17. The receiving end of claim 15, wherein the second wireless frame transmitting module comprises:
a second acquisition unit, configured to acquire, by the receiving end, initial channel information and kth channel information, where the initial channel information is channel information when none of the L transmission devices sends the first radio frame; the kth channel information is channel information when the receiving end receives a first wireless frame sent by a kth transmission device; the k e (1, 2, …, L);
a second determining unit, configured to determine, by the receiving end, at least one transmission device as a transmission device of information to be transmitted in the L transmission devices according to the initial channel information and the kth channel information;
and the second sending unit is used for sending the relevant information of the transmission device of the information to be transmitted to the sending end by the receiving end through the second wireless frame.
18. The receiving end of claim 17, wherein the second determining unit is further configured to compare the difference between the kth channel information and the initial channel information at the receiving end, and determine a transmission apparatus with the largest difference among the L transmission apparatuses as the target transmission apparatus.
19. An ambient backscatter system, comprising:
a transmitting end, the transmitting end includes L transmission devices, L is a positive integer greater than or equal to 2, and is used for:
respectively sending first wireless frames to a receiving end through the L transmission devices;
receiving a second wireless frame sent by the receiving end, wherein the second wireless frame is generated by the receiving end based on the received first wireless frame;
determining, in the L transmission devices, at least one transmission device as a target transmission device according to the second radio frame;
sending a third wireless frame to the receiving end through the target transmission device;
a receiving end configured to:
receiving a first radio frame sent by the sending end through the L transmission devices;
transmitting a second wireless frame to the transmitting end based on the first wireless frame transmitted by the transmitting end;
and receiving a third wireless frame sent by the sending end through a target transmission device, wherein the target transmission device is at least one transmission device determined based on the second wireless frame in the L transmission devices.
CN201710153129.XA 2017-03-15 2017-03-15 A kind of information transferring method, transmitting terminal, receiving terminal and environment backscatter system Pending CN108631906A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112311422A (en) * 2019-07-29 2021-02-02 华为技术有限公司 Signal transmission method and device
WO2021052068A1 (en) * 2019-09-17 2021-03-25 华为技术有限公司 Method and apparatus for data transmission in back reflection communication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112311422A (en) * 2019-07-29 2021-02-02 华为技术有限公司 Signal transmission method and device
WO2021052068A1 (en) * 2019-09-17 2021-03-25 华为技术有限公司 Method and apparatus for data transmission in back reflection communication
US11888608B2 (en) 2019-09-17 2024-01-30 Huawei Technologies Co., Ltd. Data transmission method and apparatus in backscatter communication

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