Backscatter communication method and device for step-by-step constellation fusion and electronic equipment

Abstract

The invention discloses a backscatter communication method and device for step-by-step constellation fusion and electronic equipment, which are applied to a multi-stream symbiotic backscatter communication system, and the method comprises the steps: reconstructing a plurality of user signals into a plurality of to-be-transmitted signals which are subjected to step-by-step constellation fusion and have unique decomposition characteristics after constellation symbols are multiplied and fused; transmitting the plurality of to-be-transmitted signals to an RIS array surface, fusing the plurality of to-be-transmitted signals with a 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 framework to obtain the fusion signal, and determining the user signals from the fusion signal one by one. By utilizing the unique decomposition characteristic of step-by-step constellation fusion, the signal source can perform fusion transmission on the signals, so that the spectrum utilization rate is improved, the complexity of a received signal form is reduced, the decoding performance of the system is improved, the decoding interference between a user signal and a backscattering signal is avoided, and the transmission effectiveness and reliability can be remarkably improved.

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 electronic equipment with step-by-step constellation fusion. Background Art

[0002] The rapid development of 5G technology has brought great impetus to the Internet of Things (IoT), enabling IoT devices to achieve faster data transmission speeds, lower latency, and wider connectivity. However, with the surge in IoT devices, large-scale connections have also brought two challenging problems: scarce spectrum resources and rising energy consumption. Spectrum resources are the radio spectrum required to transmit data in wireless communications. As more and more devices are connected to the network, the demand for spectrum resources is also increasing. However, spectrum resources are limited and are already very crowded in many places and industry applications, which leads to the scarcity of spectrum resources and the need to develop wireless communication technologies with higher spectrum efficiency. At the same time, the access of massive nodes will also lead to a significant increase in energy consumption. Therefore, it is necessary to study wireless transmission methods with high spectrum efficiency and high energy efficiency to ensure the transmission reliability and effectiveness of large-scale IoT connections.

[0003] Combining Reconfigurable Intelligent Surface (RIS) technology with backscatter communication technology can further enhance the communication capabilities of IoT devices. Backscatter communication technology allows devices to transmit data by reflecting modulated signals from external radiation sources (such as base stations or digital TV broadcast towers), which can further reduce the energy consumption of devices. Combined with RIS, the direction and characteristics of the reflected signal can be more accurately controlled, thereby improving the efficiency and reliability of backscatter 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 electronic device with step-by-step constellation fusion, which are 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 with a step-by-step constellation fusion is provided, which is applied to a multi-stream coexistence backscatter communication system, comprising: Reconstructing multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion characteristics of having a unique decomposition characteristic after constellation symbols are multiplied and fused; Transmitting multiple signals to be transmitted to the RIS array and fusing them with the backscattered signals to obtain a fused signal, and reflecting the fused signal to the receiving end; Based on the SIC decoding framework, the received signal at the receiving end is decoded to obtain a fused signal, and user signals are determined one by one from the fused signal.

[0007] In a possible implementation, multiple user signals are reconstructed into multiple signals to be transmitted that satisfy the step-by-step constellation fusion and have a unique decomposition characteristic after constellation symbols are multiplied and fused, including: All user signals are reconstructed into a group of signals to be transmitted that meet the requirements of a unique decomposition characteristic after constellation symbol multiplication and fusion.

[0008] In a possible implementation, decoding a received signal at a receiving end based on a SIC decoding framework to obtain a fused signal, and determining user signals one by one from the fused signal includes: Decoding the received signal according to the SIC decoding framework to obtain a fused signal; The user signals are decomposed one by one from the fused signal based on the unique decomposition characteristics.

[0009] In a possible implementation, multiple user signals are reconstructed into multiple signals to be transmitted that satisfy the step-by-step constellation fusion and have a unique decomposition characteristic after constellation symbols are multiplied and fused, including: Dividing all user signals into a number of user signal groups; The user signals in the same user signal group are reconstructed into signals to be transmitted that satisfy the step-by-step constellation fusion and have a unique decomposition characteristic after constellation symbols are multiplied and fused, thereby obtaining multiple groups of signals to be transmitted.

[0010] In a possible implementation, multiple groups of signals to be transmitted correspond to multiple groups of fused signals; multiple groups of fused signals correspond to multiple groups of received signals; based on the SIC decoding framework, the received signals at the receiving end are decoded to obtain fused signals, and user signals are determined one by one from the fused signals, including: Decode each group of received signals in turn according to the SIC decoding framework to obtain the corresponding fused signal; User signals are decomposed one by one from each group of fused signals based on the unique decomposition characteristics.

[0011] In a possible implementation, based on the SIC decoding framework, a received signal at a receiving end is decoded to obtain a fused signal, and user signals are determined one by one from the fused signal, and then the following steps are included: Calculate the signal-to-interference-noise ratio corresponding to the fused signal; If the signal-to-interference-noise ratio is greater than the preset threshold, the decoding is successful; The optimal power allocation coefficient of the RIS array is determined based on a preset threshold.

[0012] In a possible implementation, determining the optimal power allocation coefficient of the RIS array based on a preset threshold includes: Determine the reflection coefficient symbiosis restriction condition according to the reflection coefficient constraint condition; The optimization is performed based on the reflection coefficient symbiosis constraint to determine the optimal power allocation coefficient.

[0013] According to a second aspect of the present invention, there is also provided a backscatter communication device with a progressive constellation fusion, which is applied to a multi-stream coexistence backscatter communication system, comprising: A reconstruction module configured to reconstruct multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion and have a unique decomposition characteristic after constellation symbols are multiplied and fused; A fusion module is configured to transmit a plurality of signals to be transmitted to the RIS array and fuse them 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 framework to obtain a fused signal, and determine the user signals one by one from the fused signal.

[0014] According to the third aspect of the present invention, there is also provided a backscatter communication device with step-by-step constellation fusion, which includes 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 with step-by-step constellation fusion.

[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 runs on the access authentication device, the access authentication device executes any of the steps of the above-mentioned step-by-step constellation fusion backscatter communication method.

[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 backscatter communication method with step-by-step constellation fusion, which reconstructs multiple user signals into multiple signals to be transmitted with step-by-step constellation fusion that satisfy the unique decomposition characteristics after constellation symbols are multiplied and fused. Different from the existing RIS-enabled environmental backscatter system, the unique decomposition characteristics of step-by-step constellation fusion are utilized, and the signal source can fuse and transmit the signal, thereby improving the spectrum utilization rate, reducing the complexity of the received signal form, and improving the decoding performance of the system. The multiple signals to be transmitted are transmitted to the RIS array and fused with the backscatter signal to obtain a fused signal, and the fused signal is reflected to the receiving end, thereby avoiding decoding interference between the user signal and the backscatter signal, and significantly improving the transmission effectiveness and reliability. The received signal of the receiving end is decoded based on the SIC decoding framework to obtain a fused signal, and the user signals are determined one by one from the fused signal, and the interference between the signals and the high constellation order of the fused signal are comprehensively considered. In addition, the power coefficient allocation is flexibly selected according to the number of user signals, and the transmission performance of the system is effectively improved. 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 with step-by-step constellation fusion provided by the present invention; Figure 2 A schematic structural diagram of an embodiment of a reflective RIS multi-stream coexistence backscatter communication system provided by the present invention; Figure 3 A schematic diagram of a flow chart of an embodiment of determining the optimal power allocation coefficient of a RIS array provided by the present invention; Figure 4 A comparison chart of the interruption rates of a conventional solution and an embodiment of a transmission mechanism 1 and a transmission mechanism 2 under two user signals provided by the present invention; Figure 5A schematic structural diagram of an embodiment of a backscatter communication device with progressive constellation fusion provided by the present invention; Figure 6 A schematic diagram of the structure of a backscatter communication device with progressive constellation fusion provided in 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 electronic equipment with step-by-step constellation fusion, which are described below respectively.

[0022] See also Figure 1 , Figure 1 A flowchart of an embodiment of a backscatter communication method with a step-by-step constellation fusion provided by the present invention is provided. In a specific embodiment of the present invention, a backscatter communication method with a step-by-step constellation fusion is disclosed, which is applied to a multi-stream symbiotic backscatter communication system, including: S101, reconstructing a plurality of user signals into a plurality of signals to be transmitted that satisfy the step-by-step constellation fusion characteristics of having a unique decomposition characteristic after constellation symbols are multiplied and fused; S102, transmitting multiple signals to be transmitted to the RIS array and fusing them with the backscattered signals to obtain a fused signal, and reflecting the fused signal to the receiving end; S103 . Decode the received signal at the receiving end based on the SIC decoding framework to obtain a fused signal, and determine user signals one by one from the fused signal.

[0023] In the above embodiment, a specific constellation symbol multiplication fusion technology is used to ensure that multiple user signals can still be uniquely decomposed back to the original signal after fusion, thereby avoiding interference between signals. A step-by-step constellation fusion algorithm is designed, which uses the specific mathematical properties of constellation symbols (such as multiplication characteristics) to fuse multiple user signals into a single composite signal. The key to fusion is to ensure that the fused signal can be uniquely decomposed back to the original multiple user signals at the receiving end. When designing a fusion algorithm, it is necessary to ensure that the fused signal has sufficient discrimination so that the original signal of each user can be accurately restored at the receiving end through a specific decoding algorithm.

[0024] Using a reconfigurable smart surface (RIS) as a relay, multiple signals to be transmitted are fused with backscattered signals, and the fused signals are transmitted to the receiving end through the reflection characteristics of RIS. According to the characteristics of the signals to be transmitted, the phase and amplitude of the RIS array are dynamically adjusted to achieve optimal signal fusion and reflection. Multiple signals to be transmitted are simultaneously irradiated onto the RIS array, and RIS fuses the signals with backscattered signals according to the preset configuration, and sends the fused signals to the receiving end through reflection.

[0025] It should be noted that, in an embodiment of the present invention, all user information can be taken as a group of signals to jointly constitute a group of signals to be transmitted that satisfy the step-by-step constellation fusion characteristic after the constellation symbols are multiplied and fused and have a unique decomposition characteristic. Alternatively, the user information can be divided into multiple groups of user information, each group of user information constitutes a signal group to be transmitted that satisfies the step-by-step constellation fusion characteristic after the constellation symbols are multiplied and fused and has a unique decomposition characteristic, thereby obtaining multiple groups of signal groups to be transmitted.

[0026] See also Figure 2 , Figure 2 The structural diagram of an embodiment of the reflective RIS multi-stream symbiotic backscatter communication system provided by the present invention is a unique decomposition method of "step-by-step constellation fusion" in a given PSK constellation form, which realizes the multiplication and unique decomposition of multiple PSK constellation signals. The symbiotic system includes a signal 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 is backscatter modulated as a whole, and the number of reflection units of the array is N, which can be dynamically adjusted according to the system performance requirements.

[0027] Compared with the prior art, the present embodiment provides a backscatter communication method with step-by-step constellation fusion, which reconstructs multiple user signals into multiple signals to be transmitted with step-by-step constellation fusion that satisfy the unique decomposition characteristics after constellation symbol multiplication and fusion. Different from the existing RIS-enabled environmental backscatter system, the unique decomposition characteristics of step-by-step constellation fusion are utilized, and the signal source can fuse and transmit the signal, thereby improving spectrum utilization, reducing the complexity of the received signal form, and improving the decoding performance of the system. The multiple signals to be transmitted are transmitted to the RIS array and fused with the backscatter signal to obtain a fused signal, and the fused signal is reflected to the receiving end, thereby avoiding decoding interference between the user signal and the backscatter signal, and significantly improving the transmission effectiveness and reliability. The received signal of the receiving end is decoded based on the SIC decoding framework to obtain a fused signal, and the user signals are determined one by one from the fused signal, and the interference between the signals and the high constellation order of the fused signal are comprehensively considered. The power coefficient allocation is flexibly selected according to the number of user signals, and the transmission performance of the system is effectively improved.

[0028] In some embodiments of the present invention, reconstructing multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion having a unique decomposition characteristic after constellation symbols are multiplied and fused includes: All user signals are reconstructed into a group of signals to be transmitted that meet the requirements of a unique decomposition characteristic after constellation symbol multiplication and fusion.

[0029] In some embodiments of the present invention, decoding a received signal at a receiving end based on a SIC decoding framework to obtain a fused signal, and determining user signals one by one from the fused signal, includes: Decoding the received signal according to the SIC decoding framework to obtain a fused signal; The user signals are decomposed one by one from the fused signal based on the unique decomposition characteristics.

[0030] In the above embodiment, all user signals are reconstructed into a group of signals to be transmitted that meet the requirements of the unique decomposition characteristics after the constellation symbols are multiplied and fused, which is the transmission mechanism 1. A two-hop channel model is established from the source S to the RIS array, and from the RIS array to the receiving end D. In the first-hop channel model, the source S first receives the received m The user signal is constructed to conform to a specific BPSK constellation The signal satisfies the unique decomposition form of "step-by-step constellation fusion", that is, the constellation symbols of each user signal have unique decomposition after multiplication and fusion, that is, the signal sent by the source S , and sent to the RIS array, and the backscattered signal of the RIS array Fusion forwarding is performed. Also from a specific constellation Select so that the fusion signal The unique decomposition property is still satisfied. In the second hop channel model, the RIS front reflection signal It is transmitted to the receiving end through the second hop channel. Then the receiving end decodes it using the SIC decoding rule. , and then according to the unique decomposition, Decompose into user signals and backscattered signal .

[0031] Specifically, in transmission mechanism 1, consider that the information source S transmits m user signals at the same time. Then, at the receiving end, the received nth signal can be expressed as:

[0032] in, , is the transmission power of the source S, yes and The signal formed after the fusion of is the backscattering efficiency of the RIS array, is the reflection coefficient of the RIS front, and the phase shift of the RIS i-th unit is set to: To offset the effect of channel phase shift. It is a channel The phase shift, It is a channel phase shift. The power is Additive white Gaussian noise (AWGN), that is .

[0033] In some embodiments of the present invention, reconstructing multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion having a unique decomposition characteristic after constellation symbols are multiplied and fused includes: Dividing all user signals into a number of user signal groups; The user signals in the same user signal group are reconstructed into signals to be transmitted that satisfy the step-by-step constellation fusion and have a unique decomposition characteristic after constellation symbols are multiplied and fused, thereby obtaining multiple groups of signals to be transmitted.

[0034] In some embodiments of the present invention, multiple groups of signals to be transmitted correspond to multiple groups of fused signals; multiple groups of fused signals correspond to multiple groups of received signals; based on the SIC decoding framework, the received signals at the receiving end are decoded to obtain fused signals, and user signals are determined one by one from the fused signals, including: Decode each group of received signals in turn according to the SIC decoding framework to obtain the corresponding fused signal; User signals are decomposed one by one from each group of fused signals based on the unique decomposition characteristics.

[0035] In the above embodiment, all user signals are divided into several groups of user signal groups, and the user signals in the same group of user signal groups are reconstructed into signals to be transmitted that meet the requirements of the constellation symbol multiplication and fusion and have a unique decomposition characteristic, so as to obtain multiple groups of signals to be transmitted as the transmission mechanism 2. A two-hop channel model of user signals from the source S to the RIS array and from the RIS array to the receiving end D is established. In the first-hop channel model, the source S first divides the received m user signals into two parts, which are respectively constructed to meet the specific BPSK constellation The signal of the source S can be recorded as: , where the user signal The unique decomposition characteristics of "step-by-step constellation fusion" are met, and the user signal The unique decomposition characteristics of "step-by-step constellation fusion" are also met. Each user signal is in a specific BPSK constellation form. and They are the power allocation coefficients of the two groups of signals to be transmitted. And they are sent to the RIS array, and the backscattered signals of the RIS array Fusion forwarding is performed. Also from a specific constellation Select so that the fusion signal and The unique decomposition property is still satisfied. In the second hop channel model, the RIS front reflection signal and It is transmitted to the receiving end through the second hop channel. Then the receiving end decodes it using the SIC decoding rule. and , and then according to the unique decomposition, and Decompose into corresponding user signal and backscatter signal .

[0036] Specifically, considering that the signal source S transmits m user signals at the same time, the nth signal received at the receiving end can be expressed as:

[0037] in, is the backscattering efficiency of the RIS array, is the reflection coefficient of the RIS array, and the RIS unit phase setting satisfies: , to offset the influence of channel phase shift. It is a channel The phase shift, It is a channel phase shift. The power is The zero-mean additive white Gaussian noise (AWGN) is . for a specific constellation, for a specific constellation. and is the power allocation coefficient, satisfying To facilitate the subsequent determination of the decoding order, set .

[0038] See also Figure 3 , Figure 3 A flow chart of an embodiment of determining the optimal power allocation coefficient of the RIS array provided by the present invention. In some embodiments of the present invention, a received signal at a receiving end is decoded based on a SIC decoding framework to obtain a fused signal, and user signals are determined one by one from the fused signal, and then the following steps are included: S301, calculating the signal-to-interference-noise ratio corresponding to the fused signal; S302: If the signal to interference noise ratio is greater than a preset threshold, the decoding is successful; S303: Determine the optimal power allocation coefficient of the RIS array based on a preset threshold.

[0039] In the above embodiment, after the transmission mechanism is decoded, the receiving end D adopts the SIC decoding framework and only needs to decode , we can get the symbols of each user signal and backscattered signal. According to Shannon's formula, when decoding The signal-to-noise ratio (SNR) is greater than the decoding threshold , then the system is judged to have decoded successfully, otherwise it is judged to have decoded failed.

[0040] The receiving end D uses the SIC method to decode , decoding The SINR can be written as: ; In order to ensure successful decoding, .

[0041] After the transmission mechanism 2 is decoded, the receiving end D uses the SIC decoding framework to decode in sequence and . Decoding Time will It is regarded as interference and will be decoded successfully. Eliminate from the received signal and then decode . System symbiosis needs to meet decoding The signal-to-interference-to-noise ratio (SINR) is greater than the decoding threshold , decoding The signal-to-interference-to-noise ratio (SINR) is greater than the decoding threshold , in order to determine whether the reflection coefficient that satisfies the system symbiosis can be found. Based on the MAX-MIN criterion, the power allocation of the transmitting source S to the two fusion signals is optimized to determine the optimal power allocation coefficient , which is related to the number of user signals m Related.

[0042] At the receiving end, the signal is decoded according to the SIC decoding rule. and ,from Chinese decoding When , the received signal to interference and noise ratio (SINR) at the receiving end is: ; In successful decoding Based on this, the receiving end decodes The received signal-to-noise ratio (SINR) is: .

[0043] In some embodiments of the present invention, determining the optimal power allocation coefficient of the RIS array based on a preset threshold includes: Determine the reflection coefficient symbiosis restriction condition according to the reflection coefficient constraint condition; The optimization is performed based on the reflection coefficient symbiosis constraint to determine the optimal power allocation coefficient.

[0044] In the above embodiment, in order to ensure successful decoding, it is necessary to meet and , through the above analysis, in order to satisfy the symbiotic transmission mechanism, the reflection coefficient on the RIS array Must meet: ; In order to ensure the existence of the reflection coefficient of the RIS front To satisfy the above formula, there are the following symbiotic conditions: ; .

[0045] Optimal power distribution coefficient It can be obtained by solving the following optimization problem: ; ; ; Among them, the definition , , st is the abbreviation of subject to, respectively and The value of is constrained.

[0046] See also Figure 4 , Figure 4 This is a comparison chart of the interruption rates of the traditional solution and an embodiment of the transmission mechanism 1 and the transmission mechanism 2 under two user signals provided by the present invention. In the traditional RIS symbiotic backscatter system with a direct transmission link, the main system signal relies on the direct transmission link for transmission. The RIS only has a reflection function and acts as a backscatter modulator in the symbiotic system and enhances the backscatter signal propagation channel. The signal source uses the NOMA technology to perform power domain synthesis on the main system signal.

[0047] 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 , .

[0048] The idea of ​​the simulation program code is as follows: set the parameters and 、 、 Generate random samples from an exponential distribution In the transmission mechanism 1, when When , the system decoding is successful, otherwise the system is interrupted. In the transmission mechanism 2, the condition for the system to coexist is that a reflection coefficient that meets the condition can be found, otherwise the system will be interrupted. The judgment condition is the reflection coefficient constraint condition and the reflection coefficient coexistence constraint condition, that is, when the lower bound of the inequality is less than or equal to the upper bound, the system transmission will not be interrupted. This program first simulates the probability of successful communication of the system , interruption probability 。 For the interruption performance simulation, the interruption performance curve of the present invention is drawn with the transmission signal-to-noise ratio as the horizontal axis and the interruption probability of the symbiotic system as the vertical axis.

[0050] The simulation results show that the interruption probability of the RIS-enabled multi-stream symbiotic backscattering system under Rayleigh channel conditions, using the two-user main system signals, varies with the signal-to-noise ratio using the traditional method and the two transmission mechanisms proposed by the present invention. Figure 4 It can be seen that the transmission mechanism proposed in the present invention can effectively reduce the interruption rate of the system and improve the transmission reliability of the system.

[0051] In order to better implement the backscatter communication method with step-by-step constellation fusion in the embodiment of the present invention, based on the backscatter communication method with step-by-step constellation fusion, correspondingly, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of an embodiment of a backscatter communication device with a step-by-step constellation fusion provided by the present invention. The embodiment of the present invention provides a backscatter communication device 500 with a step-by-step constellation fusion, including: A reconstruction module 510, configured to reconstruct the multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion having a unique decomposition characteristic after constellation symbols are multiplied and fused; A fusion module 520, which is configured to transmit multiple signals to be transmitted to the RIS array and fuse them with the backscattered signal to obtain a fused signal, and reflect the fused signal to the receiving end; The decoding module 530 is configured to decode the received signal of the receiving end based on the SIC decoding framework to obtain a fused signal, and determine the user signals one by one from the fused signal.

[0052] It should be noted here that: the device 500 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 6 , Figure 6 A schematic diagram of the structure of a backscatter communication device with a step-by-step constellation fusion provided in an embodiment of the present invention. Based on the above-mentioned backscatter communication method with a step-by-step constellation fusion, the present invention also provides a backscatter communication device with a step-by-step constellation fusion. The backscatter communication device with a step-by-step constellation fusion can be a computing device such as a mobile terminal, a desktop computer, a notebook, a PDA, and a server. The backscatter communication device 600 with a step-by-step constellation fusion includes a processor 610, a memory 620, and a display 630. Figure 6 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 620 may be an internal storage unit of the backscatter communication device 600 with progressive constellation fusion, such as a hard disk or memory of the backscatter communication device 600 with progressive constellation fusion. In other embodiments, the memory 620 may also be an external storage device of the backscatter communication device 600 with progressive constellation fusion, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the backscatter communication device 600 with progressive constellation fusion. Further, the memory 620 may also include both an internal storage unit and an external storage device of the backscatter communication device 600 with progressive constellation fusion. The memory 620 is used to store application software and various data installed in the backscatter communication device 600 with progressive constellation fusion, such as a program code for installing the backscatter communication device 600 with progressive constellation fusion. The memory 620 may also be used to temporarily store data that has been output or is to be output. In one embodiment, a backscatter communication program 640 with progressive constellation fusion is stored in the memory 620, and the backscatter communication program 640 with progressive constellation fusion can be executed by the processor 610, thereby implementing the backscatter communication method with progressive constellation fusion of each embodiment of the present application.

[0055] In some embodiments, the processor 610 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 620, such as executing a backscatter communication method with a step-by-step constellation fusion.

[0056] In some embodiments, the display 630 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 630 is used to display information on the backscatter communication device 600 with progressive constellation fusion and to display a visual user interface. The components 610-630 of the backscatter communication device 600 with progressive constellation fusion communicate with each other via a system bus.

[0057] In one embodiment, when the processor 610 executes the backscatter communication program 640 with progressive constellation fusion in the memory 620, the steps in the above backscatter communication method with progressive constellation fusion are implemented.

[0058] This embodiment further provides a computer-readable storage medium, on which a backscatter communication program with a level-by-level constellation fusion is stored. When the backscatter communication program with a level-by-level constellation fusion is executed by a processor, the following steps are implemented: Reconstructing multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion characteristics of having a unique decomposition characteristic after constellation symbols are multiplied and fused; Transmitting multiple signals to be transmitted to the RIS array and fusing them with the backscattered signals to obtain a fused signal, and reflecting the fused signal to the receiving end; Based on the SIC decoding framework, the received signal at the receiving end is decoded to obtain a fused signal, and user signals are determined one by one from the fused signal.

[0059] In summary, the present invention provides a backscatter communication method with step-by-step constellation fusion, which reconstructs multiple user signals into multiple signals to be transmitted with step-by-step constellation fusion that satisfy the unique decomposition characteristics after constellation symbol multiplication and fusion. Different from the existing RIS-enabled environmental backscatter system, the unique decomposition characteristics of step-by-step constellation fusion are utilized, and the signal source can fuse and transmit the signal, thereby improving the spectrum utilization rate, reducing the complexity of the received signal form, and improving the decoding performance of the system. The multiple signals to be transmitted are transmitted to the RIS array and fused with the backscatter signal to obtain a fused signal, and the fused signal is reflected to the receiving end, thereby avoiding the decoding interference between the user signal and the backscatter signal, and can significantly improve the transmission effectiveness and reliability. Based on the SIC decoding framework, the received signal of the receiving end is decoded to obtain a fused signal, and the user signal is determined one by one from the fused signal, and the interference between the signals and the high constellation order of the fused signal are comprehensively considered. In addition, the power coefficient allocation is flexibly selected according to the number of user signals, and the transmission performance of the system is effectively improved.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 backscatter communication method with a progressive constellation fusion, applied to a multi-stream symbiotic backscatter communication system, It is characterized in that include: Reconstructing multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion characteristics of having a unique decomposition characteristic after constellation symbols are multiplied and fused; Transmitting the multiple signals to be transmitted to the RIS array and fusing them with the backscattered signals to obtain a fused signal, and reflecting the fused signal to the receiving end; The received signal at the receiving end is decoded based on the SIC decoding framework to obtain the fused signal, and the user signals are determined one by one from the fused signal.

2. The backscatter communication method with progressive constellation fusion as claimed in claim 1, It is characterized in that The step of reconstructing the plurality of user signals into a plurality of signals to be transmitted that satisfy the step-by-step constellation fusion having a unique decomposition characteristic after constellation symbols are multiplied and fused comprises: All user signals are reconstructed into a group of signals to be transmitted that meet the requirements of a unique decomposition characteristic after constellation symbol multiplication and fusion.

3. The backscatter communication method with progressive constellation fusion as claimed in claim 2, It is characterized in that The step of decoding the received signal of the receiving end based on the SIC decoding framework to obtain the fused signal, and determining the user signals one by one from the fused signal, comprises: Decoding the received signal according to the SIC decoding framework to obtain the fused signal; The user signals are decomposed one by one from the fused signal based on unique decomposition characteristics.

4. The backscatter communication method with progressive constellation fusion as claimed in claim 1, It is characterized in that The step of reconstructing the multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion having a unique decomposition characteristic after constellation symbols are multiplied and fused comprises: Dividing all user signals into a number of user signal groups; The user signals in the same user signal group are reconstructed into signals to be transmitted which satisfy the step-by-step constellation fusion and have a unique decomposition characteristic after constellation symbols are multiplied and fused, thereby obtaining multiple groups of signals to be transmitted.

5. The backscatter communication method with progressive constellation fusion as claimed in claim 4, It is characterized in that The plurality of groups of signals to be transmitted correspond to the plurality of groups of fused signals; the plurality of groups of fused signals correspond to the plurality of groups of received signals; the receiving signals at the receiving end are decoded based on the SIC decoding framework to obtain the fused signals, and the user signals are determined one by one from the fused signals, including: Decoding each group of received signals in turn according to the SIC decoding framework to obtain a corresponding fused signal; The user signals are decomposed one by one from each group of fusion signals based on the unique decomposition characteristic.

6. The backscatter communication method with step-by-step constellation fusion as claimed in claim 1, It is characterized in that The method further comprises decoding the received signal of the receiving end based on the SIC decoding framework to obtain the fused signal, and determining the user signals one by one from the fused signal, and then comprising: Calculating a signal-to-interference-noise ratio corresponding to the fused signal; If the signal to interference noise ratio is greater than a preset threshold, the decoding is successful; An optimal power allocation coefficient for the RIS array is determined based on the preset threshold.

7. The backscatter communication method with progressive constellation fusion as claimed in claim 6, It is characterized in that The determining the optimal power allocation coefficient of the RIS array based on the preset threshold comprises: Determine the reflection coefficient symbiosis restriction condition according to the reflection coefficient constraint condition; The optimization is performed based on the reflection coefficient symbiosis constraint condition to determine the best power allocation coefficient.

8. A backscatter communication device with progressive constellation fusion, applied to a multi-stream symbiotic backscatter communication system, It is characterized in that include: A reconstruction module configured to reconstruct multiple user signals into multiple signals to be transmitted that satisfy the step-by-step constellation fusion and have a unique decomposition characteristic after constellation symbols are multiplied and fused; A fusion module, configured to transmit the multiple signals to be transmitted to the RIS array and fuse them 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 framework to obtain the fused signal, and determine the user signals one by one from the fused signal.

9. A backscatter communication device with progressive constellation fusion, 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 with progressive constellation fusion as claimed in 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 with step-by-step constellation fusion as described in any one of claims 1 to 7.

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