Backscatter communication system and method for reducing collision probability of excitation and communication

Abstract

The present invention proposes a backscatter communication system for reducing the probability of excitation and communication collisions, which relates to the field of wireless communication technology. The system comprises one or more terminals, one or more exciters, and a receiver. The exciters generate and transmit excitation signals through orthogonal coding, the terminals reflect the excitation signals through orthogonal coding and modulate terminal feedback information, the receiver first distinguishes and extracts excitation interference signals of different exciters through orthogonal decoding, then removes the excitation interference signals through an excitation interference elimination method, and finally extracts and demodulates terminal reflection signals of different terminals through an orthogonal decoding method. The present invention can reduce the interference of the excitation interference signals on the terminal reflection signals after the collision when multiple exciters and multiple terminals are networked, improve the ability to distinguish and demodulate the reflection signals of different terminals, reduce the communication collision probability of the reflection signals of different terminals, and improve the communication efficiency when multiple terminals and multiple exciters of the system are networked.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a backscatter communication system and method for reducing the probability of collision between excitation and communication. Background Art

[0002] Backscatter communication system architectures primarily include three types: integrated transceiver architecture, synchronous excitation and reception with separate transceivers, and asynchronous excitation and reception with separate transceivers. Traditional integrated transceiver backscatter communication systems and synchronous excitation and reception with separate transceivers require wired connections to transmit synchronization and calibration signals between the excitation and reception channels, while asynchronous excitation and reception with separate transceivers do not.

[0003] In existing backscatter communication systems, since the terminal reflection signal needs to complete the communication access and identification process during each communication process, when the receiver receives the reflection signals of different terminals at the same frequency at the same time, the signal collision causes the signal waveform to change, making it impossible for the receiver to correctly demodulate. On the other hand, the excitation interference signal of the same frequency may also be received by the receiver at the same time, resulting in the excitation interference signal being unable to be effectively removed by the receiver, and thus the receiver cannot correctly demodulate the terminal reflection signal. In addition, when the existing backscatter communication system is networked, it mainly uses time-slot random access, fallback retransmission and other mechanisms to reduce the probability of communication collisions and thus improve the communication success rate. It is difficult to remove the excitation interference signals at the same frequency at the same time, and it is also difficult to demodulate the reflection signals of different terminals at the same frequency at the same time. When the number of terminals and exciters is large, the probability of communication collision is large, the networking efficiency is low, and the overall communication performance of the system is limited.

[0004] Based on this, the present application proposes a backscatter communication system and method for reducing the probability of collision between excitation and communication to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a backscatter communication system and method that reduces the probability of excitation and communication collisions, which can distinguish between excitation interference signals from different exciters and terminal reflection signals from different terminals, so that there is a certain probability of completing reception and demodulation under the interference of different excitation interference signals and after the collision of terminal reflection signals, thereby reducing the probability of terminal reflection signal collision and improving the communication success rate.

[0006] The technical solution of the present invention is:

[0007] In a first aspect, the present application provides a backscatter communication system for reducing the probability of collision between excitation and communication, which includes one or more terminals, one or more exciters, and a receiver;

[0008] The exciter is used to generate and transmit an excitation signal, and the excitation signal is modulated and generated by an orthogonal coding method; wherein different exciters select any one orthogonal codeword from a plurality of known orthogonal codewords for orthogonal coding to generate excitation signals with different orthogonal codewords;

[0009] The terminal is used to receive the excitation signal transmitted by the exciter, generate a terminal reflection signal according to the terminal feedback information and the received excitation signal, and send the terminal reflection signal to the receiver;

[0010] The receiver is used to receive a multi-excitation multi-terminal mixed signal formed by superimposing the terminal reflection signal and multiple excitation interference signals through a communication link.

[0011] Furthermore, the above-mentioned terminal adopts an orthogonal coding method to reflect the excitation signal and modulate the terminal feedback information. Different terminals select any one orthogonal codeword from a plurality of known orthogonal codewords for orthogonal coding to generate terminal reflection signals with different orthogonal codewords.

[0012] Furthermore, the process of generating the terminal feedback information includes the following steps:

[0013] Orthogonal decoding is used to distinguish and extract excitation interference signals encoded with different orthogonal codewords from a multi-excitation multi-terminal mixed signal, thereby obtaining a single-excitation multi-terminal mixed signal of different terminal reflection signals and excitation interference signals reflecting the same excitation signal;

[0014] Based on the extracted single-excitation multi-terminal mixed signal and the excitation reference signal, the excitation interference signal is removed by excitation interference cancellation to obtain a single-excitation multi-terminal mixed residual signal of the reflected signals of different terminals reflecting the same excitation signal;

[0015] The terminal reflection signals encoded with different orthogonal codewords are extracted from the single-excitation multi-terminal mixed residual signal by orthogonal decoding to obtain different single-terminal reflection signals;

[0016] Different single-terminal reflected signals are demodulated to obtain different terminal feedback information.

[0017] Furthermore, the above-mentioned excitation interference elimination method includes time delay adjustment, subtraction and autocorrelation.

[0018] Furthermore, the exciter provides the excitation reference signal to the receiver via a wired or wireless manner.

[0019] The exciter may not provide an excitation reference signal.

[0020] In a second aspect, the present application provides a backscatter communication method for reducing the probability of collision between excitation and communication, comprising the following steps:

[0021] S1. Using an orthogonal coding method, multiple exciters are used to modulate and transmit different excitation signals, wherein the excitation signals include an excitation interference signal and an excitation reference signal;

[0022] S2. Different terminals receive the excitation signal and use an orthogonal coding method to generate different terminal reflection signals;

[0023] S3, superimposing multiple terminal reflection signals on multiple excitation interference signals through a communication link to obtain a multi-excitation multi-terminal mixed signal;

[0024] S4. Receive the multi-excitation multi-terminal mixed signal through a receiver, and use an orthogonal decoding method to distinguish and extract the excitation interference signals encoded by different orthogonal codewords from the multi-excitation multi-terminal mixed signal, thereby obtaining a single-excitation multi-terminal mixed signal of the excitation interference signals from the same excitation signal and the reflection signals from different terminals;

[0025] S5. The receiver uses the extracted single-excitation multi-terminal mixed signal and the excitation reference signal to remove the excitation interference signal through delay adjustment, subtraction and autocorrelation excitation interference cancellation, and obtains a single-excitation multi-terminal mixed residual signal of different terminal reflection signals reflecting the same excitation signal;

[0026] S6. The receiver extracts terminal reflection signals encoded with different orthogonal codewords from the single-excitation multi-terminal mixed residual signal using an orthogonal decoding method to obtain different single-terminal reflection signals;

[0027] S7. The receiver demodulates different single-terminal reflected signals to obtain different terminal feedback information.

[0028] In a third aspect, the present application provides an electronic device, characterized by comprising:

[0029] a memory for storing one or more programs;

[0030] processor;

[0031] When the one or more programs are executed by the processor, a backscatter communication method for reducing the probability of collision between excitation and communication as described in the second aspect is implemented.

[0032] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a backscatter communication method for reducing the probability of collision between excitation and communication as described in the second aspect above.

[0033] Compared with the prior art, the present invention has at least the following advantages or beneficial effects:

[0034] The present invention provides a backscatter communication system and method for reducing the probability of collision between excitation and communication. When the backscatter communication system is networked for communication, by introducing orthogonal coding and decoding in the process of generating and receiving the excitation signal and the terminal reflection signal, the system can reduce the interference of multiple excitation interference signals on the terminal reflection signal after the collision when multiple exciters and multiple terminals are networked, thereby improving the ability of the backscatter communication system receiver to distinguish and demodulate the terminal reflection signals of different terminals, reducing the collision probability when the terminal reflection signals of different terminals are received at the same time, and improving the communication efficiency when the backscatter communication system is networked with multiple terminals and multiple exciters, thereby expanding the practical application scenarios of the backscatter communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is an architecture diagram of a backscatter communication system for reducing the probability of collision between excitation and communication according to the present invention;

[0037] Figure 2 Schematic diagram of signal collision in the communication process of the existing backscatter communication system network;

[0038] Figure 3 A schematic diagram of signal collision during networking communication of the backscatter communication system of the present invention;

[0039] Figure 4 Schematic diagram of the excitation, reflection and reception demodulation processing process in the backscatter communication system networking communication process of the present invention;

[0040] Figure 5 Schematic diagram of the orthogonal decoding process in the communication reception and demodulation process of the backscatter communication system network;

[0041] Figure 6 The figure is a schematic structural block diagram of an electronic device of the present invention.

[0042] Icon: 101, memory; 102, processor; 103, communication interface. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0046] It should be noted that, in this document, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the elements defined by the phrase "comprises..." do not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the elements.

[0047] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, or electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0048] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features thereof may be combined with each other.

[0049] Example 1

[0050] See also Figure 1 , Figure 1The diagram shows an architecture of a backscatter communication system for reducing the probability of collision between excitation and communication provided by an embodiment of the present application, including an integrated transceiver architecture, a synchronous transceiver architecture, and an asynchronous transceiver architecture.

[0051] The present application provides a backscatter communication system for reducing the probability of collision between excitation and communication, comprising one or more terminals, one or more (backscatter) exciters, and (backscatter excitation) receivers;

[0052] The exciter is used to generate and transmit an excitation signal, and the excitation signal is modulated and generated by an orthogonal coding method; wherein different exciters select any one orthogonal codeword from a plurality of known orthogonal codewords for orthogonal coding to generate excitation signals with different orthogonal codewords;

[0053] The terminal is used to receive the excitation signal transmitted by the exciter, generate a terminal reflection signal according to the terminal feedback information and the received excitation signal, and send the terminal reflection signal to the receiver;

[0054] The receiver is used to receive a multi-excitation multi-terminal mixed signal formed by superimposing a terminal reflection signal and multiple excitation interference signals through a communication link.

[0055] It should be noted that, during the networking communication process of the backscatter communication system, it is necessary to deal with the interference of the excitation interference signals of different exciters on the terminal reflection signals, as well as the mutual interference between the terminal reflection signals of different terminals at the same frequency received at the same time; in the backscatter communication system of the present invention, when the receiver receives multiple excitation interference signals of the same frequency and multiple terminal reflection signals of the same frequency at the same time, it can distinguish between the excitation interference signals from different exciters and the reflection signals from different terminals, so that after receiving different excitation interference signals and different terminal reflection signals at the same time, there is a certain probability of completing reception and demodulation, thereby further reducing the probability of terminal reflection signal collision and improving the communication success rate.

[0056] As a preferred implementation, the terminal uses an orthogonal coding method to reflect the excitation signal and modulate the terminal feedback information. Different terminals select any one orthogonal codeword from multiple known orthogonal codewords for orthogonal coding to generate terminal reflection signals with different orthogonal codewords.

[0057] As a preferred embodiment, the process of generating terminal feedback information includes the following steps:

[0058] Orthogonal decoding is used to distinguish and extract excitation interference signals encoded with different orthogonal codewords from a multi-excitation multi-terminal mixed signal, thereby obtaining a single-excitation multi-terminal mixed signal of different terminal reflection signals and excitation interference signals reflecting the same excitation signal;

[0059] Based on the extracted single-excitation multi-terminal mixed signal and the excitation reference signal, the excitation interference signal is removed by excitation interference cancellation to obtain a single-excitation multi-terminal mixed residual signal of the reflected signals of different terminals reflecting the same excitation signal;

[0060] The terminal reflection signals encoded with different orthogonal codewords are extracted from the single-excitation multi-terminal mixed residual signal by orthogonal decoding to obtain different single-terminal reflection signals;

[0061] Different single-terminal reflected signals are demodulated to obtain different terminal feedback information.

[0062] As a preferred implementation, the excitation interference elimination method includes time delay adjustment, subtraction and autocorrelation.

[0063] As a preferred implementation, the exciter may provide the excitation reference signal to the receiver in a wired or wireless manner.

[0064] like Figure 2 The figure shows a schematic diagram of signal collision during the networking communication process of an existing backscatter communication system. During the networking communication process of an existing backscatter communication system:

[0065] (1) Signal collision-free conditions mainly include:

[0066] 1) The reflected signals of multiple terminals at the same frequency excited by one or different exciters are not received by the receiver at the same time, as shown by terminals 1-1 and 1-2 of excitation 1 and terminals 5-1 and 6-1 of excitation 5 and 6;

[0067] (2) Signal collision situations mainly include:

[0068] 1) The reflected signals of multiple terminals at the same frequency excited by an exciter are received by the receiver simultaneously, as shown by terminals 2-1 and 2-2 of exciter 2;

[0069] 2) The reflected signals of multiple terminals at the same frequency excited by different exciters are received by the receiver at the same time, as shown by terminals 3-1 and 4-1 of excitation 3 and 4 respectively;

[0070] After a collision occurs in the received signals, the reception demodulation may fail.

[0071] like Figure 3 The figure shows a schematic diagram of signal collision during the networking communication process of the backscatter communication system of the present invention. During the networking communication process of the backscatter communication system of the present invention:

[0072] (1) Signal collision-free conditions mainly include:

[0073] 1) The reflected signals of multiple terminals at the same frequency excited by one or different exciters are not received by the receiver at the same time, as shown by terminals 1-1 and 1-2 of excitation 1 and terminals 7-1 and 8-1 of excitation 7 and 8;

[0074] 2) The reflected signals of multiple orthogonal terminals of the same frequency excited by one exciter are received by the receiver simultaneously, as shown in orthogonal terminal 2-3 and orthogonal terminal 2-4 of excitation 2;

[0075] 3) Multiple orthogonal terminal reflection signals of the same frequency excited by orthogonal excitation signals of different exciters are simultaneously received by the receiver, as shown in orthogonal terminal 3-2 and orthogonal terminal 4-2 of orthogonal excitation 3 and orthogonal excitation 4;

[0076] (2) Signal collision situations mainly include:

[0077] 1) The reflected signals of multiple non-orthogonal terminals of the same frequency excited by one or different exciters are received by the receiver at the same time, as shown in non-orthogonal terminal 2-1 and non-orthogonal terminal 2-2 of excitation 2;

[0078] 2) Multiple non-orthogonal terminal reflection signals of the same frequency excited by orthogonal excitation signals of different exciters are simultaneously received by the receiver, as shown in non-orthogonal terminal 3-1 and non-orthogonal terminal 4-1 of orthogonal excitation 3 and orthogonal excitation 4;

[0079] 3) Multiple orthogonal or non-orthogonal terminal reflection signals of the same frequency excited by non-orthogonal excitation signals of different exciters are received by the receiver at the same time, as shown by non-orthogonal terminal 5-1 and non-orthogonal terminal 6-1 of non-orthogonal excitation 5 and non-orthogonal excitation 6 and orthogonal terminal 5-2 and orthogonal terminal 6-2;

[0080] After a collision occurs in the received signals, the reception demodulation may fail.

[0081] like Figure 4 The figure shows the excitation, reflection and reception demodulation processing process of the backscatter communication system of the present invention. The main communication and signal processing steps after the network of the present invention are as follows:

[0082] S1. The system generates and transmits an excitation signal through an exciter, which modulates the excitation signal through orthogonal coding. Different exciters select any one of multiple known orthogonal codewords for orthogonal coding to generate excitation signals with different orthogonal codewords. The exciter can provide an excitation reference signal to the receiver through wired or wireless means, or it may not provide an excitation reference signal.

[0083] S2. The terminal receives the excitation signal and reflects the excitation signal. The terminal uses orthogonal coding to perform reflection modulation. Different terminals select any one orthogonal codeword from multiple known orthogonal codewords for orthogonal coding to generate terminal reflection signals with different orthogonal codewords. The multiple terminal reflection signals are superimposed on multiple excitation interference signals through the communication link to obtain a multi-excitation multi-terminal mixed signal.

[0084] S3, the receiver receives the multi-excitation multi-terminal mixed signal in S2, uses orthogonal decoding to distinguish and extract the excitation interference signals encoded by different orthogonal codewords from the multi-excitation multi-terminal mixed signal, and obtains a single excitation multi-terminal mixed signal of the excitation interference signal from the same excitation signal and the reflection signals from different terminals;

[0085] S4: The receiver uses the single-excitation multi-terminal mixed signal extracted in S3 or the extracted single-excitation multi-terminal mixed signal and the excitation reference signal in S1 to remove the excitation interference signal from the same excitation signal in S3 through excitation interference elimination methods such as delay adjustment, subtraction, and autocorrelation, and obtains a single-excitation multi-terminal mixed residual signal of different terminal reflection signals reflecting the same excitation signal;

[0086] S5, the receiver uses the single-excitation multi-terminal mixed residual signal in S4 to extract the terminal reflection signals encoded by different orthogonal codewords through orthogonal decoding to obtain different single-terminal reflection signals;

[0087] S6. The receiver demodulates the different single-terminal reflected signals in S5 to obtain different terminal feedback information.

[0088] In this embodiment, Figure 5 The figure shows a schematic diagram of the orthogonal decoding process during the reception and demodulation process of the backscatter communication system network communication. The reception orthogonal decoding process of the backscatter communication system network communication is divided into excitation interference orthogonal decoding and terminal reflection signal orthogonal decoding. Excitation interference orthogonal decoding uses the multi-excitation multi-terminal mixed signal to distinguish and extract orthogonal excitation interference and terminal reflection signals under the same excitation to obtain the single-excitation multi-terminal mixed signal; terminal reflection signal orthogonal decoding uses the single-excitation multi-terminal mixed residual signal to distinguish and extract different orthogonal terminal reflection signals under the same excitation to obtain the different single-terminal reflection signals. If different excitation interferences or different terminal reflection signals received simultaneously are not orthogonal, a signal collision will occur in the demodulation process, and demodulation may fail.

[0089] The present invention introduces orthogonal coding and decoding in the process of generating and receiving excitation signals and terminal reflection signals during backscatter communication system networking communication, thereby reducing the interference of excitation interference signals of different exciters on terminal reflection signals, improving the ability of the backscatter communication system receiver to distinguish and demodulate terminal reflection signals of different terminals, reducing the collision probability when terminal reflection signals of different terminals are received at the same time, and improving the communication efficiency of the backscatter communication system networking communication, thereby expanding the practical application scenarios of the backscatter communication system.

[0090] Example 2

[0091] The present application provides a backscatter communication method for reducing the probability of collision between excitation and communication, comprising the following steps:

[0092] Using an orthogonal coding method, multiple exciters are used to modulate and generate different excitation signals and transmit them; wherein the excitation signals include an excitation interference signal and an excitation reference signal;

[0093] Receiving the excitation signal through different terminals and generating different terminal reflection signals by adopting an orthogonal coding method;

[0094] Multiple terminal reflection signals are superimposed on multiple excitation interference signals through the communication link to obtain a multi-excitation multi-terminal mixed signal;

[0095] The multi-excitation multi-terminal mixed signal is received by a receiver, and the excitation interference signals encoded by different orthogonal codewords are distinguished and extracted from the multi-excitation multi-terminal mixed signal by an orthogonal decoding method, thereby obtaining a single-excitation multi-terminal mixed signal of the excitation interference signals from the same excitation signal and the reflection signals from different terminals;

[0096] The receiver uses the extracted single-excitation multi-terminal mixed signal and the excitation reference signal to remove the excitation interference signal through delay adjustment, subtraction and autocorrelation excitation interference cancellation, and obtains the single-excitation multi-terminal mixed residual signal of the reflected signals of different terminals reflecting the same excitation signal;

[0097] The receiver uses an orthogonal decoding method to extract terminal reflection signals encoded with different orthogonal codewords from the single-excitation multi-terminal mixed residual signal to obtain different single-terminal reflection signals;

[0098] The receiver demodulates different single-terminal reflected signals to obtain different terminal feedback information.

[0099] The method provided by the present invention introduces orthogonal coding and decoding in the process of generating and receiving excitation signals and terminal reflection signals when a backscatter communication system is networked. This enables the system to reduce interference on terminal reflection signals caused by collision of multiple excitation interference signals when multiple exciters and multiple terminals are networked, thereby improving the ability of the backscatter communication system receiver to distinguish and demodulate terminal reflection signals from different terminals, reducing the probability of collision when terminal reflection signals from different terminals are received simultaneously, and improving the communication efficiency when multiple terminals and multiple exciters of the backscatter communication system are networked.

[0100] Example 3

[0101] See also Figure 6 , Figure 6 A schematic structural block diagram of an electronic device provided in an embodiment of the present application.

[0102] An electronic device includes a memory 101, a processor 102, and a communication interface 103. The memory 101, processor 102, and communication interface 103 are electrically connected to each other directly or indirectly to enable data transmission or interaction. For example, these components can be electrically connected to each other via one or more communication buses or signal lines. The memory 101 can be used to store software programs and modules, and the processor 102 executes the software programs and modules stored in the memory 101 to perform various functional applications and data processing. The communication interface 103 can be used to communicate signaling or data with other node devices.

[0103] Among them, the memory 101 can be, but is not limited to, random access memory (RAM), read only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0104] The processor 102 may be an integrated circuit chip with signal processing capabilities. The processor 102 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0105] It should be understood that the structure shown in the figure is merely illustrative, and a backscatter communication system and method for reducing the probability of excitation and communication collisions may include more or fewer components than shown in the figure, or have a different configuration than shown in the figure. Each component shown in the figure may be implemented using hardware, software, or a combination thereof.

[0106] In the embodiments provided in this application, it should be understood that the disclosed system or method can also be implemented in other ways. The embodiments described above are merely illustrative. For example, the flowcharts or block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0107] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0108] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0109] To sum up, the embodiments of the present application provide a backscatter communication system and method for reducing the probability of excitation and communication collisions, so that when the system is networked with multiple exciters and multiple terminals, it can reduce the interference of multiple excitation interference signals on the terminal reflected signal after the collision, improve the ability to distinguish and demodulate the reflected signals of different terminals, reduce the probability of communication collision of the reflected signals of different terminals, and improve the communication efficiency when the system is networked with multiple terminals and multiple exciters.

[0110] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

[0111] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A backscatter communication method for reducing the probability of collision between excitation and communication, characterized in that: The following steps are involved: Using an orthogonal coding method, multiple exciters are used to modulate and generate different excitation signals and transmit them; wherein the excitation signals include an excitation interference signal and an excitation reference signal; Receiving the excitation signal through different terminals and generating different terminal reflection signals by adopting an orthogonal coding method; Multiple terminal reflection signals are superimposed on multiple excitation interference signals through the communication link to obtain a multi-excitation multi-terminal mixed signal; The multi-excitation multi-terminal mixed signal is received by a receiver, and the excitation interference signals encoded by different orthogonal codewords are distinguished and extracted from the multi-excitation multi-terminal mixed signal by an orthogonal decoding method, thereby obtaining a single-excitation multi-terminal mixed signal of the excitation interference signals from the same excitation signal and the reflection signals from different terminals; The receiver uses the extracted single-excitation multi-terminal mixed signal and the excitation reference signal to remove the excitation interference signal through delay adjustment, subtraction and autocorrelation excitation interference cancellation, and obtains the single-excitation multi-terminal mixed residual signal of the reflected signals of different terminals reflecting the same excitation signal; The receiver uses an orthogonal decoding method to extract terminal reflection signals encoded with different orthogonal codewords from the single-excitation multi-terminal mixed residual signal to obtain different single-terminal reflection signals; The receiver demodulates different single-terminal reflected signals to obtain different terminal feedback information.

2. A backscatter communication system for reducing the probability of collision between excitation and communication, wherein the backscatter communication system is used to execute the backscatter communication method according to claim 1, characterized in that: including a plurality of terminals, a plurality of exciters and a receiver; The exciter is used to generate and transmit an excitation signal, and the excitation signal is modulated and generated by an orthogonal coding method; wherein different exciters select any one orthogonal codeword from a plurality of known orthogonal codewords for orthogonal coding to generate excitation signals with different orthogonal codewords; The terminal is used to receive the excitation signal transmitted by the exciter, generate a terminal reflection signal according to the terminal feedback information and the received excitation signal, and send the terminal reflection signal to the receiver; The receiver is used to receive a multi-excitation multi-terminal mixed signal formed by superimposing the terminal reflection signal and multiple excitation interference signals through a communication link.

3. The backscatter communication system for reducing the probability of collision between excitation and communication according to claim 2, wherein: The terminal uses an orthogonal coding method to reflect the excitation signal and modulate the terminal feedback information. Different terminals select any one orthogonal codeword from a plurality of known orthogonal codewords for orthogonal coding to generate terminal reflection signals with different orthogonal codewords.

4. The backscatter communication system for reducing the probability of collision between excitation and communication according to claim 2, wherein: The process of generating the terminal feedback information includes the following steps: Orthogonal decoding is used to distinguish and extract excitation interference signals encoded with different orthogonal codewords from a multi-excitation multi-terminal mixed signal, thereby obtaining a single-excitation multi-terminal mixed signal of different terminal reflection signals and excitation interference signals reflecting the same excitation signal; Based on the extracted single-excitation multi-terminal mixed signal and the excitation reference signal, the excitation interference signal is removed by excitation interference cancellation to obtain a single-excitation multi-terminal mixed residual signal of the reflected signals of different terminals reflecting the same excitation signal; The terminal reflection signals encoded with different orthogonal codewords are extracted from the single-excitation multi-terminal mixed residual signal by orthogonal decoding to obtain different single-terminal reflection signals; Different single-terminal reflected signals are demodulated to obtain different terminal feedback information.

5. The backscatter communication system for reducing the probability of collision between excitation and communication according to claim 4, characterized in that: The excitation interference elimination methods include time delay adjustment, subtraction and autocorrelation.

6. The backscatter communication system for reducing the probability of collision between excitation and communication according to claim 2, wherein: The exciter provides the excitation reference signal to the receiver in a wired or wireless manner.

7. An electronic device, characterized in that: include: a memory for storing one or more programs; processor; When the one or more programs are executed by the processor, a backscatter communication method for reducing the probability of collision between excitation and communication as claimed in claim 1 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the backscatter communication method for reducing the probability of collision between excitation and communication as claimed in claim 1 is implemented.

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