Backscatter communication method, device and equipment for uniquely decomposable constellation pair

Abstract

The invention discloses a backscatter communication method, device and equipment for a uniquely decomposable constellation pair, applied to a multi-stream symbiotic backscatter communication system, and the method comprises the steps: respectively reconstructing a plurality of user signals into to-be-transmitted signals which meet the characteristics of the uniquely decomposable constellation pair with backscatter signals of an RIS array surface; transmitting the to-be-transmitted signal to the RIS array surface, fusing the to-be-transmitted signal with the backscattering signal to obtain a fused signal, and reflecting the fused signal to a receiving end; and decoding a received signal of a receiving end based on an SIC decoding rule and a unique decomposable constellation pair principle to obtain the signal to be transmitted. According to the invention, the plurality of user signals are reconstructed into the to-be-transmitted signal which satisfies the unique decomposable constellation pair characteristic with the backscattering signal of the RIS array surface, thereby reducing the complexity of the receiving signal form, avoiding the decoding interference between the user signals and the backscattering signal, improving the effectiveness and reliability of signal transmission, and improving the reliability of the signal transmission. And a specific SIC decoding framework is constructed.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and more specifically, to a backscatter communication method, device and equipment for a uniquely decomposable constellation pair. Background Art

[0002] With the rapid rise of the 5G era, the Internet of Things, as an important part of the new generation of communication technology, will connect billions of small devices and bring more convenience and intelligent experience to people's lives. However, spectrum scarcity and energy consumption issues have also become the two major challenges for large-scale Internet of Things access.

[0003] The integration of Reconfigurable Intelligent Surface (RIS) and backscatter communication technology is a very promising way to solve the above problems. RIS reconfigures the wireless propagation environment through software-controlled reflection. RIS consists of a large number of low-cost passive reflection units, each of which can independently adjust the amplitude and / or phase changes of the incident signal. By intelligently controlling the reflection of the signal, RIS can actively change the wireless channel, thereby providing new degrees of freedom for enhancing wireless communication performance and creating conditions for realizing an intelligent and programmable wireless environment. The advantage of RIS is that it can be densely deployed at a low cost and low energy consumption. RIS eliminates the traditional radio frequency (RF) link and baseband signal processing unit, so there is no need to use additional transmission circuits, thereby reducing the cost and energy consumption of the equipment. In addition, the reflective elements of RIS can be densely arranged on a plane, so that more reflection channels can be achieved within a given spatial range, further improving the performance of wireless communication.

[0004] However, in the multi-user signal scenario, there will be serious decoding interference between each user signal and the backscattered signal. At present, when the intelligent metasurface is combined with the backscatter communication technology under the condition that the main system source transmits multi-user signals, in order to facilitate the modulation of the backscattered signal on the external radiation source main system signal at a specific frequency, the main system generally uses non-orthogonal multiple access (Non-Orthogonal Multiple Access, NOMA) signal, and the receiving end uses the serial interference cancellation technology (Successive Interference Cancellation, SIC) to decode each main system signal and backscattered signal. Although large-scale RIS can significantly improve the capacity of the backscatter channel, it will also introduce a lot of interference when decoding the main system signal; while small-scale RIS can reduce the interference of decoding the main system signal, but it will limit the backscatter transmission rate. These problems will bring challenges to the improvement of transmission robustness and capacity. Summary of the invention

[0005] In response to at least one defect or improvement need in the prior art, the present invention provides a backscatter communication method, device and equipment that can uniquely decompose constellation pairs, which is used to solve the problem in the prior art that in a multi-user signal scenario, there will be serious decoding interference between user signals and backscatter signals, which will affect the transmission robustness and capacity of information communication.

[0006] To achieve the above object, according to a first aspect of the present invention, a backscatter communication method for a uniquely decomposable constellation pair is provided, which is applied to a multi-stream coexistence backscatter communication system, comprising: Reconstructing multiple user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristics with the backscattered signals of the RIS array respectively; The signal to be transmitted is transmitted to the RIS array and fused with the backscattered signal to obtain a fused signal, and the fused signal is reflected to the receiving end; Based on the SIC decoding rule and the principle of a uniquely decomposable constellation pair, the received signal at the receiving end is decoded to obtain a signal to be transmitted.

[0007] In a possible implementation, reconstructing multiple user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristic with the backscattered signal of the RIS array respectively includes: Constructing a phase shift keying constellation pair according to a unique decomposable constellation pair construction method; A backscattered signal and a signal to be transmitted are determined from the phase shift keying constellation pair.

[0008] In a possible implementation, before transmitting the signal to be transmitted to the RIS array and fusing it with the backscattered signal to obtain a fused signal, the method further includes: Scaling the maximum constellation point energy of the backscattered signal to a preset energy value; The constellation point energy of the signal to be transmitted is scaled proportionally based on the maximum constellation point energy of the backscattered signal.

[0009] In a possible implementation, decoding a received signal at a receiving end to obtain a signal to be transmitted based on a SIC decoding rule and a uniquely decomposable constellation pair principle includes: Decoding a fused signal with a maximum power coefficient from a received signal according to a maximum ratio combining linear detection method; The decoded received signal is eliminated and the signals to be transmitted are obtained one by one from the received signal based on the SIC decoding rule.

[0010] In a possible implementation, decoding a fused signal of a maximum power coefficient from a received signal according to a maximum ratio combining linear detection method includes: measuring the signal power of the received signals, and determining the received signal with the maximum power coefficient from all the received signals; Based on the maximum ratio combining linear detection method, a decoding matrix is ​​used to decode the received signal with the maximum power coefficient to obtain a fused signal.

[0011] In a possible implementation, eliminating the decoded received signal and obtaining the to-be-transmitted signals one by one from the received signal based on the SIC decoding rule includes: Eliminating the decoded received signal from the received signal to obtain an undecoded received signal; The decoding coefficients are set based on the maximum ratio combining linear detection method to obtain the user decoded signal from the undecoded received signal; The signals to be transmitted are calculated one by one from the user decoded signals according to a preset sequence.

[0012] In a possible implementation, constructing a phase shift keying constellation pair according to a unique decomposable constellation pair construction method includes: Based on the phase shift keying constellation pair construction formula, a phase shift keying constellation pair that satisfies the unique decomposable property is constructed.

[0013] According to a second aspect of the present invention, there is also provided a backscatter communication device capable of uniquely decomposing constellation pairs, which is applied to a multi-stream coexistence backscatter communication system, comprising: A reconstruction module, configured to reconstruct the plurality of user signals into signals to be transmitted respectively, the backscattered signals with the RIS array satisfying the unique decomposable constellation pair characteristic; A fusion module is configured to transmit the signal to be transmitted to the RIS array and fuse it with the backscattered signal to obtain a fused signal, and reflect the fused signal to the receiving end; The decoding module is configured to decode the received signal of the receiving end based on the SIC decoding rule and the principle of the unique decomposable constellation pair to obtain the signal to be transmitted.

[0014] According to a third aspect of the present invention, there is also provided a backscatter communication device for a uniquely decomposable constellation pair, comprising at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit executes the steps of any one of the above-mentioned backscatter communication methods for a uniquely decomposable constellation pair.

[0015] According to a fourth aspect of the present invention, there is also provided a storage medium storing a computer program executable by an access authentication device, wherein when the computer program is run on the access authentication device, the access authentication device executes any of the steps of the backscatter communication method for a uniquely decomposable constellation pair described above.

[0016] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: The present invention provides a backscattering communication method of a unique decomposable constellation pair, which reconstructs multiple user signals into signals to be transmitted that meet the characteristics of the unique decomposable constellation pair with the backscattering signal of the RIS array. Due to the application of the unique decomposable constellation pair, no separate user signal form is required in the receiving end signal to realize SIC decoding, which reduces the complexity of the received signal form. The signal to be transmitted is transmitted to the RIS array and fused with the backscattering signal to obtain a fused signal, which avoids decoding interference between the user signal and the backscattering signal, improves the effectiveness and reliability of user information transmission, decodes the received signal at the receiving end based on the SIC decoding rule and the principle of the unique decomposable constellation pair to obtain the signal to be transmitted, and uses the characteristics of the unique decomposable constellation pair to realize one-by-one decoding of the signal to be transmitted, effectively reducing the symbol error rate of the RIS-enabled backscattering symbiotic system under multiple users. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic flow chart of an embodiment of a backscatter communication method for a uniquely resolvable constellation pair provided by the present invention; Figure 2 A schematic structural diagram of an embodiment of a multi-stream co-existence backscatter communication system provided by the present invention; Figure 3 A flow chart of an embodiment of decoding received signals one by one based on the SIC decoding rule provided by the present invention; Figure 4 A comparison diagram of symbol error rates of an embodiment of a backscatter communication method provided by the present invention and a RIS symbiotic system (reference system 1) considering a direct transmission link; Figure 5 A comparison diagram of symbol error rates of a backscatter communication method provided by the present invention and an embodiment of a "block" RIS symbiotic system (reference system 2); Figure 6 A schematic structural diagram of an embodiment of a backscatter communication device capable of only resolving constellation pairs provided by the present invention; Figure 7 A schematic structural diagram of a backscatter communication device capable of uniquely resolving constellation pairs provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] The terms "first", "second", "third", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0021] The present invention provides a backscatter communication method, device and equipment that can uniquely decompose constellation pairs, which are described below respectively.

[0022] See also Figure 1 , Figure 1 A flow chart of an embodiment of a backscatter communication method for a uniquely decomposable constellation pair provided by the present invention. In a specific embodiment of the present invention, a backscatter communication method for a uniquely decomposable constellation pair is disclosed, which is applied to a multi-stream coexistence backscatter communication system, including: S100, reconstructing multiple user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristic with the backscattered signals of the RIS array respectively; S200, transmitting the signal to be transmitted to the RIS array and fusing it with the backscattered signal to obtain a fused signal, and reflecting the fused signal to the receiving end; S300: Based on the SIC decoding rule and the principle of the unique decomposable constellation pair, the received signal at the receiving end is decoded to obtain a signal to be transmitted.

[0023] In the above embodiment, based on the UDCP principle, a specific constellation diagram is designed for the user signal, and the constellation diagram must meet the condition that it can be uniquely and efficiently decomposed back to the original signal through a specific algorithm (such as serial interference cancellation, SIC) at the receiving end. This requires that the distance and arrangement between the constellation points and the structure of the signal space are carefully designed to reduce the bit error rate and improve the system capacity. Using the designed UDCP, the signal of each user is reconstructed into a signal to be transmitted that conforms to the characteristics of a specific constellation pair. This process may involve linear transformation, phase adjustment or amplitude modulation of the signal to ensure efficient backscattering at the RIS (Reconfigurable Intelligent Surface) array.

[0024] After receiving signals from different users, the RIS array uses a large number of programmable components (such as diodes) on it to intelligently modulate these signals to form a fused signal. In this process, RIS adjusts the switching state of each component to achieve precise control of signal superposition and reflection direction. The fused signal is reflected by the RIS array to the receiving end. At this time, the signal contains both the original information of each user and the modulated information introduced by RIS.

[0025] Based on the principle of uniquely decomposable constellation pairs and SIC decoding rules, the receiver begins the decoding process. SIC is an iterative decoding method that gradually restores the original signal of each user by eliminating the interference of the strongest signal layer by layer. In this step, using the characteristics of UDCP, the receiver can accurately distinguish and restore the signal of each user, even if they overlap in the spectrum. In order to further improve system performance, the receiver may also need to perform post-processing, such as channel estimation and equalization, error correction, etc., to further improve decoding accuracy and system robustness.

[0026] See also Figure 2 , Figure 2 The schematic diagram of the structure of an embodiment of the multi-stream symbiotic backscatter communication system provided by the present invention includes a transmitting source S, a reflective RIS array, and a receiving end D located on one side of the RIS array, ignoring the direct transmission link of the system. The reflective RIS array as a whole is used as a backscatter signal modulation area (abbreviated as BD area), and the number of reflection units in the area is N, which can be dynamically adjusted according to the system performance requirements.

[0027] There are two hop channel models for user signals from the transmitting source S to the RIS array and from the RIS array to the receiving end D. In the first hop channel model, the transmitting source S constructs the m user signals to be transmitted as The signal to be transmitted that satisfies the unique decomposable pair characteristic , and sent to the RIS array, and the backscattered signal of the RIS array Carry out fusion forwarding, and The values ​​of are specific constellations and The constellation point, and is a constellation pair that satisfies the unique decomposable property, i.e., the fused signal In the second-hop channel model, RIS uses the reflection coefficient to decompose the received signals of each user. , and its own backscattered signal Merge into , and reflected to the receiving end.

[0028] Compared with the prior art, the present embodiment provides a backscatter communication method of a unique decomposable constellation pair, which reconstructs multiple user signals into signals to be transmitted that satisfy the characteristics of the unique decomposable constellation pair with the backscatter signal of the RIS array. Due to the application of the unique decomposable constellation pair, no separate user signal form is required in the receiving end signal to realize SIC decoding, which reduces the complexity of the received signal form. The signal to be transmitted is transmitted to the RIS array and fused with the backscatter signal to obtain a fused signal, which avoids decoding interference between the user signal and the backscatter signal, and improves the effectiveness and reliability of user information transmission. Based on the SIC decoding rule and the principle of the unique decomposable constellation pair, the received signal at the receiving end is decoded to obtain the signal to be transmitted, and the characteristics of the unique decomposable constellation pair are used to realize one-by-one decoding of the signal to be transmitted, effectively reducing the symbol error rate of the RIS-enabled backscatter symbiotic system under multiple users.

[0029] In some embodiments of the present invention, reconstructing a plurality of user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristic with the backscattered signals of the RIS array respectively includes: Constructing a phase shift keying constellation pair according to a unique decomposable constellation pair construction method; A backscattered signal and a signal to be transmitted are determined from the phase shift keying constellation pair.

[0030] In the above embodiment, the design of the unique decomposable constellation pair is based on the mathematical orthogonality or good separability principle, which aims to make the signals of different users or different data streams clearly distinguishable on the constellation diagram and reduce mutual interference. In PSK modulation, each symbol represents different data by changing the phase of the carrier. In order to construct a constellation pair that meets the unique decomposable property, multiple phase sets can be designed, each set representing the signal space of a user. These sets should be dispersed as much as possible on the phase plane to reduce overlap and interference between signals of different users.

[0031] In some embodiments of the present invention, before transmitting the signal to be transmitted to the RIS array and fusing it with the backscattered signal to obtain a fused signal, the method further includes: Scaling the maximum constellation point energy of the backscattered signal to a preset energy value; The constellation point energy of the signal to be transmitted is scaled proportionally based on the maximum constellation point energy of the backscattered signal.

[0032] In the above embodiment, since RIS is a passive device, in actual engineering, the backscattering efficiency η and reflection coefficient β of the RIS array cannot reach 1, that is, and This will make it difficult to place and Fusion Therefore, in order to ensure that the fused signal has unique decomposition characteristics, the backscattered signal is modulated according to the characteristic that the RIS array signal power does not increase during the modulation process. The maximum constellation point energy is scaled to 1, and The corresponding constellation point energies are amplified in equal proportion, so that the fused signal still has a unique decomposition characteristic.

[0033] In some embodiments of the present invention, decoding a received signal at a receiving end to obtain a signal to be transmitted based on a SIC decoding rule and a uniquely decomposable constellation pair principle includes: Decoding a fused signal with a maximum power coefficient from a received signal according to a maximum ratio combining linear detection method; The decoded received signal is eliminated and the signals to be transmitted are obtained one by one from the received signal based on the SIC decoding rule.

[0034] In the above embodiment, since the received signal may come from multiple paths (including a direct path and a RIS reflection path), the receiving end uses the maximum ratio combining (MRC) linear detection method to weightedly combine the signals from different paths according to the channel estimation result. This step is intended to maximize the signal-to-noise ratio of the combined signal, thereby improving the decoding performance. In the combined signal, the maximum power fused signal can be identified based on the size of the power coefficient. This signal usually corresponds to the user or data stream with the strongest channel gain. Using the characteristics of the unique decomposable constellation pair, the receiving end can decode the fused signal and extract the data to be transmitted.

[0035] Once the maximum power fusion signal is successfully decoded, the receiving end will decode the user signal to be transmitted and the backscattered signal based on the signal. . The maximum power fused signal is subtracted from the original received signal to eliminate the impact of this signal on other signals to be decoded. This step is the core of SIC decoding, which improves the decoding quality of subsequent signals by gradually eliminating the interference of the decoded signal. After eliminating the interference of the maximum power signal, the receiving end will process the remaining received signals one by one in the order of signal power from large to small. For each signal to be decoded, the receiving end will repeat the above decoding and interference elimination process until all signals to be transmitted are successfully decoded.

[0036] In some embodiments of the present invention, decoding a fused signal of a maximum power coefficient from a received signal according to a maximum ratio combining linear detection method includes: measuring the signal power of the received signals, and determining the received signal with the maximum power coefficient from all the received signals; Based on the maximum ratio combining linear detection method, a decoding matrix is ​​used to decode the received signal with the maximum power coefficient to obtain a fused signal.

[0037] In the above embodiment, the channel coefficients from the transmitting source S to the RIS front and from the RIS front to the receiving end D are respectively set to and Considering that the transmitting source transmits m user signals at the same time, the nth signal received at the receiving end can be expressed as: ; in, , yes and The signal formed by fusion forwarding, PS is the total power transmitted by base station S, is the power allocation coefficient of each main system signal, is the backscattering efficiency of the RIS array, is the reflection coefficient of the RIS front, The power is Complex white Gaussian noise (AWGN), that is .

[0038] To simplify the representation, define First, the fusion signal with the maximum power Decoding is performed using the decoding matrix under MRC algorithm detection. ,Right now ; in, . Fusion signal with maximum power coefficient It can be detected according to the following expression: ; It should be noted that A represents the original value of the signal. It represents the actual value of the signal received by the receiving end of signal A. It represents the estimated value of signal A. Such symbols will not be explained one by one below.

[0039] See also Figure 3 , Figure 3 A flow chart of an embodiment of decoding received signals one by one based on the SIC decoding rule provided by the present invention. In some embodiments of the present invention, the decoded received signals are eliminated and the signals to be transmitted are obtained one by one from the received signals based on the SIC decoding rule, including: S301, eliminating the decoded received signal from the received signal to obtain an undecoded received signal; S302, setting decoding coefficients based on a maximum ratio combining linear detection method to obtain a user decoded signal from an undecoded received signal; S303 , calculating the signals to be transmitted one by one from the user decoded signals according to a preset order.

[0040] In the above embodiment, according to the above decoding estimation , the user signal can be uniquely decomposed and backscattered signal , the received signal In, minus , and obtain the following expression: ; Next, the receiver uses the MRC detector, i.e., the decoding coefficients , we can get the following expression: ; Therefore, the signal to be transmitted It can be estimated by the following expression: ; Next, combine the decoded signal , The remaining fusion signals are decoded in turn according to the power size, and so on, the general expression can be obtained as follows: ; in, , .

[0041] In some embodiments of the present invention, constructing a phase shift keying constellation pair according to a uniquely decomposable constellation pair construction method includes: Based on the phase shift keying constellation pair construction formula, a phase shift keying constellation pair that satisfies the unique decomposable property is constructed.

[0042] In the above embodiment, if the PSK constellations 𝒳 and 𝒴 respectively meet the following conditions: ; ; Where r=p+q, then constellations 𝒳 and 𝒴 form a UFCP constellation pair.

[0043] See also Figure 4 , Figure 4 For a comparison of symbol error rates of the backscatter communication method provided by the present invention and an embodiment of the RIS symbiotic system (reference system 1) considering a direct transmission link, please refer to Figure 5 , Figure 5 A comparison diagram of symbol error rates of the backscatter communication method provided by the present invention and an embodiment of a "block" RIS symbiotic system (reference system 2).

[0044] Benchmark system 1: A traditional RIS symbiotic backscatter system with a direct transmission link. The main system signal relies on the direct transmission link for propagation, and the RIS only has a reflection function. In the symbiotic system, it acts as a backscatter device (BD) to modulate and enhance the backscatter signal propagation. Similarly, the number of RIS array units is the same as that of the invention system.

[0045] Baseline system 2: The units on the RIS array are divided into the BD area and the Enhance Primary (EP) area, where the BD area modulates the backscattered signal onto the primary system signal, and the EP area is used to enhance the primary system signal. To ensure fairness, the total number of units in the EP area and the BD area is consistent with the invention system.

[0046] The simulation parameters are set as follows: Assume that all channels are independent and identically distributed complex Gaussian fading, that is, and Considering the impact of path loss, represents the path loss exponent, and we get and Without loss of generality, the average channel power gain is set to , For the benchmark system 1, the average channel power gain of the direct link of the main system is assumed to be ,For the benchmark system 2, the average gain of each hop channel is 0.25.

[0047] The idea of ​​the simulation program code is as follows: set the parameters and , Generate random samples from an exponential distribution Assume that the transmitting source of the "uniquely decomposable constellation pair" system performs NOMA power allocation on the two user signals to be sent, and constructs a signal form that satisfies the uniquely decomposable constellation pair under the same BPSK form, and the backscattered signal of the RIS array After multiplication and fusion, a unique decomposition can be achieved, that is, , and , among which the constellation Then the constellation point set of the fusion signal can be determined as

[0048]

[0049] constellation , They form unique decomposable constellation pairs with constellation C. and The simulation results show that the symbol error rate of the RIS-enabled symbiotic environment backscatter system under Rayleigh channel conditions, using the traditional method and the "uniquely decomposable constellation pair" system of the present invention, varies with the signal-to-noise ratio. Figure 4 , Figure 5 It can be seen that the "uniquely decomposable constellation pair" system proposed in the present invention can effectively reduce the symbol error rate of the system receiving end and improve the transmission reliability of the system.

[0050] In summary, the present invention provides a backscatter communication method of a unique decomposable constellation pair, which reconstructs multiple user signals into signals to be transmitted that meet the characteristics of the unique decomposable constellation pair with the backscatter signal of the RIS array. Due to the application of the unique decomposable constellation pair, no separate user signal form is required in the receiving end signal to realize SIC decoding, which reduces the complexity of the received signal form. The signal to be transmitted is transmitted to the RIS array and fused with the backscatter signal to obtain a fused signal, which avoids decoding interference between the user signal and the backscatter signal, and improves the effectiveness and reliability of user information transmission. Based on the SIC decoding rule and the principle of the unique decomposable constellation pair, the received signal at the receiving end is decoded to obtain the signal to be transmitted, and the characteristics of the unique decomposable constellation pair are used to realize one-by-one decoding of the signal to be transmitted, which effectively reduces the symbol error rate of the RIS-enabled backscatter symbiotic system under multiple users.

[0051] In order to better implement the backscatter communication method of the unique decomposable constellation pair in the embodiment of the present invention, based on the backscatter communication method of the unique decomposable constellation pair, correspondingly, please refer to Figure 6 , Figure 6This is a schematic diagram of the structure of an embodiment of a backscatter communication device for a uniquely resolvable constellation pair provided by the present invention. The embodiment of the present invention provides a backscatter communication device 600 for a uniquely resolvable constellation pair, including: A reconstruction module 610, which is configured to reconstruct the multiple user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristic with the backscattered signals of the RIS array; A fusion module 620, which is configured to transmit the signal to be transmitted to the RIS array and fuse it with the backscattered signal to obtain a fused signal, and reflect the fused signal to the receiving end; The decoding module 630 is configured to decode the received signal of the receiving end based on the SIC decoding rule and the principle of the unique decomposable constellation pair to obtain the signal to be transmitted.

[0052] It should be noted here that: the device 600 provided in the above embodiment can implement the technical solutions described in the above method embodiments. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above method embodiments, which will not be repeated here.

[0053] See also Figure 7 , Figure 7 A schematic diagram of the structure of a backscatter communication device for a unique resolvable constellation pair provided by an embodiment of the present invention. Based on the above-mentioned backscatter communication method for a unique resolvable constellation pair, the present invention also provides a backscatter communication device for a unique resolvable constellation pair. The backscatter communication device for a unique resolvable constellation pair can be a computing device such as a mobile terminal, a desktop computer, a notebook, a palm computer, and a server. The backscatter communication device 700 for a unique resolvable constellation pair includes a processor 710, a memory 720, and a display 730. Figure 7 Only some components of the synchronous tracking flying welding equipment for real-time measurement of battery height are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0054] In some embodiments, the memory 720 may be an internal storage unit of the backscatter communication device 700 that can uniquely decompose constellation pairs, such as a hard disk or memory of the backscatter communication device 700 that can uniquely decompose constellation pairs. In other embodiments, the memory 720 may also be an external storage device of the backscatter communication device 700 that can uniquely decompose constellation pairs, such as a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the backscatter communication device 700 that can uniquely decompose constellation pairs. Further, the memory 720 may also include both the internal storage unit of the backscatter communication device 700 that can uniquely decompose constellation pairs and an external storage device. The memory 720 is used to store application software and various types of data installed in the backscatter communication device 700 that can uniquely decompose constellation pairs, such as the program code of the backscatter communication device 700 that can uniquely decompose constellation pairs. The memory 720 may also be used to temporarily store data that has been output or is to be output. In one embodiment, a backscatter communication program 740 for a uniquely decomposable constellation pair is stored in the memory 720, and the backscatter communication program 740 for a uniquely decomposable constellation pair can be executed by the processor 710, thereby implementing the backscatter communication method for a uniquely decomposable constellation pair of each embodiment of the present application.

[0055] In some embodiments, the processor 710 may be a central processing unit (CPU), a microprocessor or other data processing chip, configured to execute program codes stored in the memory 720 or process data, such as executing a backscatter communication method for a uniquely resolvable constellation pair.

[0056] In some embodiments, the display 730 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 730 is used to display information of the backscatter communication device 700 that can uniquely resolve constellation pairs and to display a visual user interface. The components 710-730 of the backscatter communication device 700 that can uniquely resolve constellation pairs communicate with each other via a system bus.

[0057] In one embodiment, when the processor 710 executes the backscatter communication program 740 of the uniquely resolvable constellation pair in the memory 720, the steps in the above method of backscatter communication of the uniquely resolvable constellation pair are implemented.

[0058] This embodiment further provides a computer-readable storage medium, on which a backscatter communication program for a uniquely decomposable constellation pair is stored. When the backscatter communication program for a uniquely decomposable constellation pair is executed by a processor, the following steps are implemented: Reconstructing multiple user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristics with the backscattered signals of the RIS array respectively; The signal to be transmitted is transmitted to the RIS array and fused with the backscattered signal to obtain a fused signal, and the fused signal is reflected to the receiving end; Based on the SIC decoding rule and the principle of a uniquely decomposable constellation pair, the received signal at the receiving end is decoded to obtain a signal to be transmitted.

[0059] The present application also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of the above method are implemented. The computer-readable storage medium may include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a micro drive, and a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic card or an optical card, a nanosystem (including a molecular memory IC), or any type of medium or device suitable for storing instructions and / or data.

[0060] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0061] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0062] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0063] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0065] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, disk or optical disk and other media that can store program codes.

[0066] A person skilled in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable memory, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0067] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A unique backscatter communication method for decomposing constellation pairs, applied to multi-stream coexistence backscatter communication system, It is characterized in that include: Reconstructing multiple user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristics with the backscattered signals of the RIS array respectively; Transmitting the signal to be transmitted to the RIS array and fusing it with the backscattered signal to obtain a fused signal, and reflecting the fused signal to a receiving end; Based on the SIC decoding rule and the principle of the unique decomposable constellation pair, the received signal at the receiving end is decoded to obtain the signal to be transmitted.

2. The backscatter communication method of the uniquely resolvable constellation pair as claimed in claim 1, It is characterized in that The step of reconstructing the plurality of user signals into signals to be transmitted that satisfy the unique decomposable constellation pair characteristic with the backscattered signals of the RIS array respectively comprises: Constructing a phase shift keying constellation pair according to a unique decomposable constellation pair construction method; The backscattered signal and the signal to be transmitted are determined from the phase shift keying constellation pair.

3. The backscatter communication method of the uniquely resolvable constellation pair as claimed in claim 1, It is characterized in that Before transmitting the signal to be transmitted to the RIS array and fusing it with the backscattered signal to obtain a fused signal, the method further includes: Scaling the maximum constellation point energy of the backscattered signal to a preset energy value; The constellation point energy of the signal to be transmitted is scaled proportionally based on the maximum constellation point energy of the backscattered signal.

4. The backscatter communication method of the uniquely resolvable constellation pair as claimed in claim 1, It is characterized in that The method of decoding the received signal at the receiving end based on the SIC decoding rule and the principle of the unique decomposable constellation pair to obtain the signal to be transmitted includes: Decoding a fused signal of maximum power coefficient from the received signal according to a maximum ratio combining linear detection method; The decoded received signal is eliminated and the signals to be transmitted are obtained one by one from the received signal based on the SIC decoding rule.

5. The backscatter communication method of the uniquely resolvable constellation pair as claimed in claim 4, It is characterized in that Decoding a fused signal of a maximum power coefficient from the received signal according to a maximum ratio combining linear detection method includes: Measuring the signal power of the received signals, and determining a received signal with a maximum power coefficient from all the received signals; Based on the maximum ratio combining linear detection method, a decoding matrix is ​​used to decode the received signal with the maximum power coefficient to obtain the fused signal.

6. The backscatter communication method of the uniquely resolvable constellation pair as claimed in claim 4, It is characterized in that The step of eliminating the decoded received signal and obtaining the to-be-transmitted signals one by one from the received signal based on the SIC decoding rule includes: Eliminating the decoded received signal from the received signal to obtain an undecoded received signal; Setting decoding coefficients based on the maximum ratio combining linear detection method to obtain a user decoded signal from the undecoded received signal; The signals to be transmitted are calculated one by one from the user decoded signals according to a preset sequence.

7. The backscatter communication method of the uniquely resolvable constellation pair as claimed in claim 2, It is characterized in that The method of constructing a phase shift keying constellation pair according to a unique decomposable constellation pair construction method comprises: Based on the phase shift keying constellation pair construction formula, a phase shift keying constellation pair that satisfies the unique decomposable property is constructed.

8. A backscatter communication device that can uniquely decompose constellation pairs, applied to a multi-stream coexistence backscatter communication system, It is characterized in that include: A reconstruction module, configured to reconstruct the plurality of user signals into signals to be transmitted respectively, the backscattered signals with the RIS array satisfying the unique decomposable constellation pair characteristic; A fusion module, configured to transmit the signal to be transmitted to the RIS array and fuse it with the backscattered signal to obtain a fused signal, and reflect the fused signal to a receiving end; The decoding module is configured to decode the received signal of the receiving end based on the SIC decoding rule and the principle of the unique decomposable constellation pair to obtain the signal to be transmitted.

9. A backscatter communication device that can uniquely resolve constellation pairs, It is characterized in that The invention comprises at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit executes the steps of the backscatter communication method of the uniquely decomposable constellation pair according to any one of claims 1 to 7.

10. A storage medium, It is characterized in that It stores a computer program executable by an access authentication device. When the computer program runs on the access authentication device, the access authentication device executes the steps of the backscatter communication method of the uniquely decomposable constellation pair as claimed in any one of claims 1 to 7.

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