5g-based wireless power transfer noma cooperation system power allocation method and device

Abstract

The application provides a 5G-based wireless power-carrying NOMA cooperation system power distribution method and device, the method comprising: sequentially taking any one of M users in a current NOMA cooperation system as a primary user and other users as secondary users to obtain M standby grouping selections, wherein M is an integer greater than 1; determining M power division coefficients λ corresponding to the M standby selection conditions and M energies collected at a relay node; and determining the M grouping selections as final grouping selections based on the M power division coefficients λ and the M energies collected at the relay node. Compared with fixed primary and secondary users, the method can improve the transmission reliability of the system, the primary and secondary relationships between users are determined from multiple factors such as channel gain and user demand, and the method has great flexibility. The primary and secondary user relationship determined by comprehensively considering multiple aspects improves the transmission reliability of the system, and further improves the overall performance of the system on the basis of the existing power distribution system.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a power allocation method and apparatus for a 5G-based wireless power-carrying NOMA cooperative system. Background Technology

[0002] Currently, Non-Orthogonal Multiple Access (NOMA) is considered one of the most promising multiple access methods in fifth-generation (5G) mobile communication and has attracted widespread attention. Unlike traditional Orthogonal Multiple Access (OMA), NOMA can allocate different power to multiple users in the same time, frequency, and code domains, thereby greatly improving the spectrum allocation efficiency of the system. Patent application number 201610724079.1 discloses a low-complexity NOMA system power allocation method.

[0003] For 5G mobile communication systems, energy efficiency, like spectral efficiency, is a key indicator for measuring system performance. Energy harvesting (EH) technology, which can power energy-constrained wireless networks, has become an effective means of improving energy efficiency. In particular, Wireless Information and Power Synchronization Transfer (SWIPT) is considered a novel and effective energy harvesting technology, primarily collecting and storing energy from radio frequency signals. In SWIPT cooperative relay networks, common relay protocols are divided into two types: Time Switching Relay (TSR) protocols and Power Allocation Relay (PSR) protocols. Patent application number 201810224458.3 discloses a power optimization method for wirelessly powered NOMA cooperative networks, using the PSR relay protocol, mainly addressing the problem of insufficient energy supply to secondary user nodes in existing NOMA cooperative cognitive radio networks.

[0004] Furthermore, in NOMA cooperative systems, power allocation is often based on channel gain, but this method cannot meet the communication needs of users. To improve system performance, the concept of primary and secondary users was introduced. The basic idea is that the system prioritizes the communication needs of primary users, and only provides services to secondary users after their needs are met. However, primary and secondary users are not always absolute, and blindly prioritizing the needs of primary users may lead to a decline in overall system performance. Therefore, efficient transmission in a communication system cannot mechanically satisfy the needs of primary users, but should comprehensively consider multiple factors such as channel conditions and user requirements.

[0005] Therefore, how to provide a power allocation scheme for a 5G-based wireless power-carrying NOMA cooperative system that can further improve the overall system performance on the basis of existing power allocation systems is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] This invention provides a power allocation method and apparatus for a 5G-based wireless power-enabled NOMA cooperative system, which further improves the overall system performance based on existing power allocation systems.

[0007] In a first aspect, the present invention provides a power allocation method for a 5G-based wireless power-carrying NOMA cooperative system, comprising:

[0008] By sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users, M alternative group selections are obtained, where M is an integer greater than 1.

[0009] Determine the M power division coefficients λ corresponding to the M alternative options and the M energy values ​​P collected at the relay nodes. R2 ;

[0010] Based on the M power division coefficients λ and the M energy P collected at the relay node R2 The M grouping options are determined as the final grouping options.

[0011] In one embodiment, the step of sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users to obtain M alternative group selections includes:

[0012] Obtain user information for M users in the current NOMA collaboration system, wherein the M users include: the first user and the second user;

[0013] By designating the first user as the primary user and the second user as the secondary user, a first backup group selection is obtained;

[0014] By designating the second user as the primary user and the first user as the secondary user, a second backup group selection is obtained.

[0015] In one embodiment, the determination of the M power division coefficients λ corresponding to the M backup options and the M energy P collected at the relay node... R2 include:

[0016] For the first backup group selection, user D1 is the primary user and user D2 is the secondary user. The signal received at the relay node is then determined as follows:

[0017] based on The demodulation signal-to-noise ratios of signals s1 and s2 used by the relay node were determined to be as follows: and

[0018] Based on the constraints of energy harvesting at relay nodes, we can obtain The relay node must meet the following conditions Determine the expressions for the power allocation coefficients a1 and a2, and the value of the power division coefficient λ at the relay node:

[0019]

[0020] Wherein, the noise in the system follows (0, δ) 2 The system is distributed by a Gaussian distribution, and the average signal-to-noise ratio is defined as γ = P. S / δ 2 When λ≤0, all the energy carried in the signal received by the relay node is used to demodulate the signal.

[0021] The energy collected at the relay node is: P R1 =ηλP S =max{η(P S |h max | 2 -ξσ 2 )}, where ξ=γ th1 +γ th2 +γ th1 γ th2 .

[0022] In one embodiment, the determination of the M power division coefficients λ corresponding to the M backup options and the M energy P collected at the relay node... R2 include:

[0023] For the second backup group selection, user D2 is the primary user and user D1 is the secondary user. Then, the signal received at the relay node at this time is:

[0024] based on The demodulation signal-to-noise ratios of signals s1 and s2 at the relay node are determined to be respectively and

[0025] Based on the constraints of energy harvesting at relay nodes, we can obtain and The relay node must meet the following conditions The power division factor λ and the energy P collected by the relay node were determined. R2 .

[0026] In one embodiment, the M power division coefficients λ and the M energy P collected at the relay node are used as the basis for this process. R2 The M grouping options selected as the final grouping options include:

[0027] Based on the M power division coefficients λ and the M energy P collected at the relay node R2 Determine M system performance values;

[0028] The power division coefficient λ corresponding to the maximum value among the M system performance values ​​and the corresponding energy reserve P R The backup group selection was determined as the final group selection;

[0029] Power allocation for the system is based on the primary and secondary users determined by the final group selection.

[0030] Secondly, embodiments of the present invention provide a power allocation device for a 5G-based wireless power-carrying NOMA cooperative system, comprising:

[0031] The primary and secondary selection module is used to sequentially select any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users, resulting in M ​​alternative group selections, where M is an integer greater than 1.

[0032] The coefficient energy determination module is used to determine the M power division coefficients λ corresponding to the M alternative options and the M energy values ​​P collected at the relay node. R2 ;

[0033] The final grouping determination module is used to determine the grouping based on the M power division coefficients λ and the M energy values ​​P collected at the relay nodes. R2 The M grouping options are determined as the final grouping options.

[0034] In one embodiment, the primary / secondary selection module includes:

[0035] The user information acquisition unit is used to acquire user information of M users in the current NOMA collaboration system, wherein the M users include: the first user and the second user;

[0036] The first selection unit is used to select the first user as the primary user and the second user as the secondary user to obtain the first backup group selection;

[0037] The second selection unit is used to select the second user as the primary user and the first user as the secondary user to obtain a second backup group selection.

[0038] In one embodiment, the coefficient energy determination module includes:

[0039] The first group determination unit is used to select the first backup group. If user D1 is the primary user and user D2 is the secondary user, then the signal received at the relay node is determined as follows:

[0040] The first signal-to-noise ratio determination unit is used to determine the signal-to-noise ratio based on... The demodulation signal-to-noise ratios of signals s1 and s2 used by the relay node were determined to be as follows: and

[0041] The first coefficient power determination unit, used based on the constraints of energy harvesting at relay nodes, yields... The relay node must meet the following conditions Determine the expressions for the power allocation coefficients a1 and a2, and the value of the power division coefficient λ at the relay node:

[0042] Wherein, the noise in the system follows (0, δ) 2 The system is distributed by a Gaussian distribution, and the average signal-to-noise ratio is defined as β = P. s / δ 2 When λ≤0, all the energy carried in the signal received by the relay node is used for demodulation; the energy collected at the relay node is: P R1 =ηλP S =max{η(P S |h max | 2 -ξσ 2 )}, where ξ=γ th1 +γ th2 +γ th1 γ th2 .

[0043] In one embodiment, the coefficient energy determination module includes:

[0044] The second group determination unit is used to select the second backup group. User D2 is the primary user and user D1 is the secondary user. Then, the signal received at the relay node at this time is:

[0045] The second signal-to-noise ratio determination unit is used to determine the signal-to-noise ratio based on... The demodulation signal-to-noise ratios of signals s1 and s2 at the relay node are determined to be respectively and

[0046] The second coefficient power determination unit, used based on the constraints of energy harvesting at relay nodes, yields... and The relay node must meet the following conditions The power division factor λ and the energy P collected by the relay node were determined. R2 .

[0047] In one embodiment, the final grouping determination module includes:

[0048] The performance value determination unit is used to determine the performance value based on the M power division coefficients λ and the M energy values ​​P collected at the relay node. R2 Determine M system performance values;

[0049] The maximum value determination unit is used to determine the power division coefficient λ and the corresponding energy reserve P corresponding to the maximum value among the M system performance values. R The backup group selection was determined as the final group selection;

[0050] The power allocation unit is used to allocate system power based on the primary and secondary users determined by the final group selection.

[0051] Thirdly, the present invention provides an electronic device, including a memory and a memory storing a computer program, wherein the processor executes the program to implement the steps of the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system described in the first aspect.

[0052] Fourthly, the present invention provides a processor-readable storage medium storing a computer program for causing the processor to perform the steps of the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system described in the first aspect.

[0053] This invention provides a power allocation method and apparatus for a 5G-based wireless power-carrying NOMA cooperative system. By breaking the designated primary and secondary user relationship in energy-constrained multi-antenna NOMA cooperative systems, the method first determines the primary and secondary user relationship through a traversal approach, considering factors such as channel gain and user requirements. Compared to fixed primary and secondary users, this method improves system transmission reliability. The comprehensive determination of the primary and secondary user relationship based on multiple factors, including channel gain and user requirements, offers greater flexibility compared to the designated primary and secondary users in typical NOMA-EH systems. This comprehensive determination of the primary and secondary user relationship enhances system transmission reliability and further improves the overall system performance based on existing power allocation systems. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1A schematic flowchart of a power allocation method for a 5G-based wireless power-carrying NOMA cooperative system is provided for an embodiment of the present invention.

[0056] Figure 2 This invention provides a schematic diagram of the composition structure of a power distribution device for a 5G-based wireless power-carrying NOMA cooperative system.

[0057] Figure 3 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0059] The following is combined with Figure 1 This invention describes a power allocation method for a 5G-based wireless power-carrying NOMA cooperative system.

[0060] Figure 1 The present invention provides a schematic flowchart of a power allocation method for a 5G-based wireless power-carrying NOMA cooperative system.

[0061] In one specific embodiment of the present invention, an embodiment of the present invention provides a power allocation method for a 5G-based wireless power-carrying NOMA cooperative system, comprising:

[0062] Step 110: Select any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users in turn, to obtain M alternative group selections, where M is an integer greater than 1.

[0063] In this embodiment of the invention, a further improvement is made to the existing energy harvesting NOMA (NOMA-EH) system. Specifically, the primary and secondary relationships between users are clearly defined in the technology, and these relationships determine the power allocation and the detection order at the receiver. However, this power allocation based on a predetermined primary and secondary relationship can lead to some resource waste. In actual communication systems, the relationship between primary and secondary users is often not static.

[0064] Therefore, based on the currently researched NOMA-EH cooperative system, this invention determines the primary and secondary relationships among users by traversing the user hierarchy according to channel gain and user transmission requirements. Then, based on this determined user hierarchy, power allocation is performed on the users in the system to determine the demodulation order of relay nodes. This ensures that the energy collected by energy-constrained relay nodes is used to correctly demodulate user signals, with as much remaining energy as possible used to forward the demodulated signals. This power allocation scheme for NOMA-EH-based cooperative systems solves the problems of energy constraints on relay nodes and the previously established primary and secondary user relationships in cooperative systems. It provides a theoretical basis for the practical application of NOMA-EH cooperative systems and can significantly improve the system's spectral efficiency and transmission performance.

[0065] Step 120: Determine the M power division coefficients λ corresponding to the M alternative options and the M energy P collected at the relay node. R2 ;

[0066] Specifically, in one embodiment, the downlink cooperative NOMA system model consists of a base station S, two random users {D1, D2}, and an energy-constrained decode-forward (DF) relay R, wherein the base station and the user terminal are each equipped with N S With N D One antenna. Additionally, assume that relay R operates in half-duplex mode, and that base station S has known the ideal channel state information and that the direct links between the base station and the two user terminals are unavailable. Furthermore, assume that all channels experience Nakagami-m fading. The channel vector between base station S and relay R is represented as 1×N. S matrix Each channel vector element follows an independent and identically distributed fading coefficient of m1, and satisfies the following conditions: Similarly, relay R and user D i The channel vector between (i = 1, 2) is represented as N. D A matrix of ×1 Each channel vector It follows an independent and identically distributed fading coefficient of m², and satisfies

[0067] In the first time slot, assuming s1 and s2 are the transmission signals of two users, and the demodulation thresholds of user D1 and user D2 are r respectively. th1 r th2 First, the antenna with the best channel gain at base station S is selected to superimpose the signal. Transmitted to the relay, where P S Let a represent the base station's transmit power, and a1 and a2 represent power allocation coefficients, satisfying a1 + a2 = 1 and a1 > a2 ≥ 0. Therefore, the signal received at the relay node can be expressed as:

[0068]

[0069] in, This represents Gaussian white noise. Simultaneously, based on the PSR protocol, the energy from the received signal is divided into two parts: λ and 1-λ. One part is used for energy collection, and the remaining part is used for information transmission. Therefore, the energy P collected by the relay node... R =ηλP S Where η represents energy conversion efficiency. Therefore, the signal used for information transmission at the relay node can be represented as:

[0070]

[0071] Without loss of generality, based on the serial interference cancellation (SIC) principle, assuming the repeater can successfully demodulate the received signal, the demodulation signal-to-noise ratios of the demodulated signals s1 and s2 are respectively... The energy collected by the relay is represented as P. R In the second time slot, the relay will superimpose the signal. The signal is transmitted to the user terminal, where β1 and β2 represent the power allocation coefficients for the two users, and β1 + β2 = 1. The allocation coefficients are randomly assigned based on the users. Therefore, the received signal is:

[0072] y i =g i X+n i (3)

[0073] To improve system transmission reliability, the receiver intends to use the maximum ratio combining (MRC) method. The received signal will then be represented as:

[0074]

[0075] At user D1, the demodulation signal-to-drying ratio used to demodulate signal s1 is expressed as: The signal-to-drying ratio used for demodulating signal s2 is then: Meanwhile, the signal-to-noise ratio used by user D2 to demodulate its own signal is expressed as: According to the expression of the signal received at the user end The expressions for each of the above representative symbols can then be obtained.

[0076] Step 130: Based on the M power division coefficients λ and the M energy P collected at the relay node R2 The M grouping options are determined as the final grouping options.

[0077] Finally, by analyzing the two or more specific scenarios mentioned above and comparing them with system performance analysis, we can select the power division coefficient and corresponding energy reserve that achieve the optimal system performance, thereby determining the primary and secondary relationships of random users in the system and the optimal power allocation scheme.

[0078] In one embodiment, the step of sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users to obtain M alternative group selections includes:

[0079] Obtain user information for M users in the current NOMA collaboration system, wherein the M users include: the first user and the second user;

[0080] By designating the first user as the primary user and the second user as the secondary user, a first backup group selection is obtained;

[0081] By designating the second user as the primary user and the first user as the secondary user, a second backup group selection is obtained.

[0082] In one embodiment, the determination of the M power division coefficients λ corresponding to the M backup options and the M energy P collected at the relay node... R2 include:

[0083] For the first backup group selection, user D1 is the primary user and user D2 is the secondary user. The signal received at the relay node is then determined as follows:

[0084] based on The demodulation signal-to-noise ratios of signals s1 and s2 used by the relay node were determined to be as follows: and

[0085] Based on the constraints of energy harvesting at relay nodes, we can obtain The relay node must meet the following conditions Determine the expressions for the power allocation coefficients a1 and a2, and the value of the power division coefficient λ at the relay node:

[0086] Wherein, the noise in the system follows (0, δ) 2 The system is distributed by a Gaussian distribution, and the average signal-to-noise ratio is defined as γ = P. S / δ 2 When λ≤0, all the energy carried in the signal received by the relay node is used to demodulate the signal.

[0087] The energy collected at the relay node is: P R1 =ηλP S=max{η(P S |h max | 2 -ξσ 2 )}, where ξ=γ th1 +γ th2 +γ th1 γ th2 .

[0088] In one embodiment, the determination of the M power division coefficients λ corresponding to the M backup options and the M energy P collected at the relay node... R2 include:

[0089] For the second backup group selection, user D2 is the primary user and user D1 is the secondary user. Then, the signal received at the relay node at this time is:

[0090] based on The demodulation signal-to-noise ratios of signals s1 and s2 at the relay node are determined to be respectively and

[0091] Based on the constraints of energy harvesting at relay nodes, we can obtain and The relay node must meet the following conditions The power division factor λ and the energy P collected by the relay node were determined. R2 .

[0092] In one embodiment, the M power division coefficients λ and the M energy P collected at the relay node are used as the basis for this process. R2 The M grouping options selected as the final grouping options include:

[0093] Based on the M power division coefficients λ and the M energy P collected at the relay node R2 Determine M system performance values;

[0094] The power division coefficient λ corresponding to the maximum value among the M system performance values ​​and the corresponding energy reserve P R The backup group selection was determined as the final group selection;

[0095] Power allocation for the system is based on the primary and secondary users determined by the final group selection.

[0096] Specifically, in one embodiment, to further improve the transmission reliability of the system, this patent employs a power allocation protocol, which aims to collect as much energy as possible from the received signal while ensuring that the relay can correctly demodulate the received signal. The specific power allocation scheme is implemented as follows:

[0097] (1) Based on the user's demodulation threshold r th1 r th2 If the relay correctly demodulates the signal, the signal-to-dryness ratio (SDR) used by the relay node to demodulate the two signals must not be less than the demodulation threshold. Next, we will discuss the implementation steps of the power allocation scheme based on the primary and secondary relationships of the users:

[0098] I: If user D1 is the primary user and user D2 is the secondary user, then the signal received at the relay node is:

[0099]

[0100] a) First, according to formula (5), the demodulation signal-to-noise ratios of signals s1 and s2 at the relay node can be calculated as follows: Then, based on the constraints of energy harvesting at relay nodes, we can obtain: To ensure the collection of as much energy as possible, the relay node must satisfy the following conditions:

[0101] b) Based on the two constraints in (a), the expressions for the power allocation coefficients a1 and a2 can be derived, and thus the value of the power division coefficient λ at the relay node can be obtained:

[0102]

[0103] Wherein, the noise in the system follows (0, δ) 2 The system is distributed by a Gaussian distribution, and the average signal-to-noise ratio is defined as γ = P. S / δ 2 When λ≤0, it means that all the energy carried in the received signal at the relay node is used for demodulation, and the relay node cannot collect any energy for energy storage. Therefore, the coefficient λ can be further expressed as:

[0104]

[0105] Therefore, the energy collected at the relay node can be expressed as: P R1 =ηλP S =max{η(P S |h max | 2 -ξσ 2 )}, where ξ=γ th1 +γ th2 +γ th1 γ th2 .

[0106] II: If User 2 is the primary user and User 1 is the secondary user, then the signal received at the relay node at this time is:

[0107]

[0108] First, according to formula (8), the demodulation signal-to-noise ratios of signals s1 and s2 at the relay node can be calculated as follows: Then, based on the constraints of energy harvesting at relay nodes, we can obtain: To ensure the collection of as much energy as possible, the relay node must satisfy the following conditions:

[0109] Similar to case I (b), based on the constraints in (a), the power splitting coefficient λ and the energy P collected at the relay node in the corresponding case can be calculated. R2 .

[0110] Based on the two specific cases analyzed in (1), by traversing these two cases and comparing them with system performance analysis, the power division coefficient λ and the corresponding energy reserve P that make the system performance optimal can be selected. R This allows us to determine the primary and secondary relationships among random users in the system and the optimal power allocation scheme.

[0111] Current research on NOMA relay systems mostly considers the performance of single-antenna NOMA cooperative systems in Rayleigh fading channels and allocates power based on channel gain. This power allocation method is rather mechanical and cannot achieve flexible power allocation according to user needs and the actual communication requirements of the system. In common NOMA cooperative systems, relays are active nodes, which are often powered by batteries with limited energy storage. However, in real-world wireless communication environments, such as dangerous scenarios at high altitudes or in radiation fields, regular battery replacement is relatively difficult. Furthermore, the system's distinction between primary and secondary users is fixed, which significantly impacts the efficiency of information transmission.

[0112] This invention proposes a power allocation method for a cooperative system based on NOMA-EH, which considers combining SWIPT technology with NOMA technology to solve the problem of energy constraints in relay nodes; at the same time, it considers transforming the fixed primary and secondary user relationship into a random primary and secondary user relationship to improve the system's spectral efficiency and transmission reliability.

[0113] This invention focuses on energy-constrained NOMA cooperative systems. By combining energy harvesting technology, it improves system performance from both spectral and energy efficiency perspectives. Through traversal determination of the primary and secondary user relationship, and considering factors such as channel gain and user demand, it enhances system transmission reliability compared to fixed primary and secondary users. What are the technical advantages of this proposal compared to existing technologies?

[0114] The power allocation scheme for a 5G-based wireless power-carrying NOMA cooperative system provided in this invention is based on the NOMA-EH cooperative system, enabling energy-constrained systems to operate normally and improving the system's spectral efficiency and energy efficiency. By traversing multiple factors such as channel gain and user demand, the primary and secondary relationships between users can be comprehensively determined, which is more flexible than the primary and secondary user assignments in a typical NOMA-EH system. This primary and secondary user relationship determined by multiple factors improves the reliability of system transmission. In multi-antenna cooperative systems under fading channels, it is more in line with practical application scenarios than single-antenna single-relay systems under Rayleigh fading channels, providing a theoretical basis for future practical applications.

[0115] The following describes the 5G-based wireless power-carrying NOMA cooperative system power allocation device provided by the present invention. The 5G-based wireless power-carrying NOMA cooperative system power allocation device described below can be referred to in correspondence with the 5G-based wireless power-carrying NOMA cooperative system power allocation method described above.

[0116] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the composition structure of a power distribution device for a 5G-based wireless power-carrying NOMA cooperative system, provided as an embodiment of the present invention.

[0117] In another specific embodiment of the present invention, an embodiment of the present invention provides a power distribution device 200 for a 5G-based wireless power-carrying NOMA cooperative system, comprising:

[0118] The primary and secondary selection module 210 is used to sequentially select any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users to obtain M alternative group selections, where M is an integer greater than 1.

[0119] The coefficient energy determination module 220 is used to determine the M power division coefficients λ corresponding to the M alternative options and the M energy values ​​P collected at the relay node. R2 ;

[0120] The final grouping determination module 230 is used to determine the M power division coefficients λ and the M energy values ​​P collected at the relay nodes. R2 The M grouping options are determined as the final grouping options.

[0121] In one embodiment, the primary / secondary selection module includes:

[0122] The user information acquisition unit is used to acquire user information of M users in the current NOMA collaboration system, wherein the M users include: the first user and the second user;

[0123] The first selection unit is used to select the first user as the primary user and the second user as the secondary user to obtain the first backup group selection;

[0124] The second selection unit is used to select the second user as the primary user and the first user as the secondary user to obtain a second backup group selection.

[0125] In one embodiment, the coefficient energy determination module includes:

[0126] The first group determination unit is used to select the first backup group. If user D1 is the primary user and user D2 is the secondary user, then the signal received at the relay node is determined as follows:

[0127] The first signal-to-noise ratio determination unit is used to determine the signal-to-noise ratio based on... The demodulation signal-to-noise ratios of signals s1 and s2 used by the relay node were determined to be as follows: and

[0128] The first coefficient power determination unit, used based on the constraints of energy harvesting at relay nodes, yields... The relay node must meet the following conditions Determine the expressions for the power allocation coefficients a1 and a2, and the value of the power division coefficient λ at the relay node:

[0129] Wherein, the noise in the system follows (0, δ) 2 The system is distributed by a Gaussian distribution, and the average signal-to-noise ratio is defined as γ = P. s / δ 2 When λ≤0, all the energy carried in the signal received by the relay node is used for demodulation; the energy collected at the relay node is: P R1 =ηλP S =max{η(P S |h max | 2 -ξσ 2 )}, where ξ=γ th1 +γ th2 +γ th1 γ th2 .

[0130] In one embodiment, the coefficient energy determination module includes:

[0131] The second group determination unit is used to select the second backup group. User D2 is the primary user and user D1 is the secondary user. Then, the signal received at the relay node at this time is:

[0132] The second signal-to-noise ratio determination unit is used to determine the signal-to-noise ratio based on... The demodulation signal-to-noise ratios of signals s1 and s2 at the relay node are determined to be respectively and

[0133] The second coefficient power determination unit, used based on the constraints of energy harvesting at relay nodes, yields... and The relay node must meet the following conditions The power division factor λ and the energy P collected by the relay node were determined. R2 .

[0134] In one embodiment, the final grouping determination module includes:

[0135] The performance value determination unit is used to determine the performance value based on the M power division coefficients λ and the M energy values ​​P collected at the relay node. R2 Determine M system performance values;

[0136] The maximum value determination unit is used to determine the power division coefficient λ and the corresponding energy reserve P corresponding to the maximum value among the M system performance values. R The backup group selection was determined as the final group selection;

[0137] The power allocation unit is used to allocate system power based on the primary and secondary users determined by the final group selection.

[0138] Thirdly, the present invention provides an electronic device, including a memory and a memory storing a computer program, wherein the processor executes the program to implement the steps of the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system described in the first aspect.

[0139] Fourthly, the present invention provides a processor-readable storage medium storing a computer program for causing the processor to perform the steps of the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system described in the first aspect.

[0140] This invention provides a power allocation device for a 5G-based wireless power-carrying NOMA cooperative system. By breaking the designated primary and secondary user relationship in energy-constrained multi-antenna NOMA cooperative systems, it first determines the primary and secondary user relationship through a traversal approach, considering factors such as channel gain and user requirements. Compared to fixed primary and secondary users, this improves system transmission reliability. The comprehensive determination of the primary and secondary user relationship based on multiple factors, including channel gain and user requirements, offers greater flexibility compared to the designated primary and secondary users in typical NOMA-EH systems. This comprehensive determination of the primary and secondary user relationship enhances system transmission reliability, further improving the overall system performance on the basis of existing power allocation systems.

[0141] It should be noted that the terminal and network device provided in this embodiment of the invention can implement all the method steps implemented in the above method embodiments and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiments will not be described in detail here.

[0142] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3 As shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330, and a communication bus 340, wherein the processor 310, the communication interface 320, and the memory 330 communicate with each other via the communication bus 340. The processor 310 can call a computer program in the memory 330 to execute steps of a power allocation method for a 5G-based wireless power-carrying NOMA cooperative system, such as including:

[0143] By sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users, M alternative group selections are obtained, where M is an integer greater than 1.

[0144] Determine the M power division coefficients λ corresponding to the M alternative options and the M energy values ​​P collected at the relay nodes. R2 ;

[0145] Based on the M power division coefficients λ and the M energy P collected at the relay node R2 The M grouping options are determined as the final grouping options.

[0146] Furthermore, the logical instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0147] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein when the program instructions are executed by a computer, the computer is able to execute the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system provided by the methods described above, the method comprising:

[0148] By sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users, M alternative group selections are obtained, where M is an integer greater than 1.

[0149] Determine the M power division coefficients λ corresponding to the M alternative options and the M energy values ​​P collected at the relay nodes. R2 ;

[0150] Based on the M power division coefficients λ and the M energy P collected at the relay node R2 The M grouping options are determined as the final grouping options.

[0151] On the other hand, embodiments of this application also provide a processor-readable storage medium storing a computer program for causing the processor to execute the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system provided in the above embodiments, including, for example:

[0152] By sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users, M alternative group selections are obtained, where M is an integer greater than 1.

[0153] Determine the M power division coefficients λ corresponding to the M alternative options and the M energy values ​​P collected at the relay nodes.R2 ;

[0154] Based on the M power division coefficients λ and the M energy P collected at the relay node R2 The M grouping options are determined as the final grouping options.

[0155] The processor-readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO)), optical memory (e.g., CD, DVD, BD, HVD), and semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)).

[0156] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0157] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for power allocation in a 5G-based wireless power transfer NOMA cooperation system, characterized in that, include: By sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users, M alternative group selections are obtained, where M is an integer greater than 1. determining M power split coefficients corresponding to the M backup selection cases and M energies collected at the relay node based on the M power splitting coefficients and the M energies collected at the relay node determine the M group selections as the final group selection; The M power division coefficients are determined based on the M power division coefficients and the M energy collected at the relay node determines the M grouping selections as the final grouping selections include: based on the M power splitting coefficients and the M energies collected at the relay node determine M system performance values; selecting the power split factor corresponding to the maximum value of the M system performance values and the corresponding energy reserve as the final grouping selection; Power allocation for the system is based on the primary and secondary users determined by the final group selection.

2. The power allocation method for a 5G-based wireless power-carrying NOMA cooperative system according to claim 1, characterized in that, The step of sequentially selecting any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users to obtain M alternative group selections includes: Obtain user information for M users in the current NOMA collaboration system, wherein the M users include: the first user and the second user; By designating the first user as the primary user and the second user as the secondary user, a first backup group selection is obtained; By designating the second user as the primary user and the first user as the secondary user, a second backup group selection is obtained.

3. The power allocation method for a 5G-based wireless power-carrying NOMA cooperative system according to claim 2, characterized in that, The determining the M power division coefficients corresponding to the M backup selection conditions and the M energies collected at the relay node include: For the first backup packet selection, the user For the primary user, the user For the secondary user, the signal received at the relay node is determined as: ; wherein, , Pi and P2 represent power allocation coefficients, P represents the transmission power of the transmitting end, , Y1 and Y2 are the demodulation signals of the primary user and the secondary user, respectively. Based on , it is determined that the relay node is used to demodulate the signal The signal The demodulation signal-to-noise ratio of the signal And ; Based on the constraints of energy harvesting at relay nodes, we can obtain , The relay node must meet the following conditions. , Determine the power allocation coefficient. , Expressions and power division coefficients at relay nodes Value: ;in, Representative signal The minimum threshold for demodulation signal-to-noise ratio. Representative signal The minimum threshold for demodulated signal-to-noise ratio; wherein the noise in the system obeys a Gaussian distribution (0, ) and the average signal-to-noise ratio of the system is defined as ; when , all the energy carried in the received signal of the relay node is used for demodulating the signal; The energy collected at the relay node is: wherein, , represents the energy conversion efficiency.

4. The power allocation method for a 5G-based wireless power-carrying NOMA cooperative system according to claim 2, characterized in that, The determining the M power division coefficients corresponding to the M backup selection conditions And the M energies collected at the relay node include: For the second backup packet selection, the user D2 is the primary user and the user D1 is the secondary user, and the signal received at the relay node at this time is: ; wherein, , respectively represent the power allocation coefficients, represent the transmission power of the transmitting end, , are the demodulation signals of the primary user and the secondary user respectively; Based on , determining a demodulation signal at the relay node with a demodulation signal-to-noise ratio and , respectively; Based on the limitation condition of the relay node energy collection, we have and The condition , must be met at the relay node and the energy collected by the relay node, where represents the signal demodulation signal-to-noise ratio threshold, represents the signal demodulation signal-to-noise ratio threshold. 5.A 5G-based wireless power transfer NOMA cooperation system power allocation device, characterized in that, include: The primary and secondary selection module is used to sequentially select any one of the M users in the current NOMA collaboration system as the primary user and the other users as secondary users, resulting in M ​​alternative group selections, where M is an integer greater than 1. a coefficient energy determination module, configured to determine M power division coefficients corresponding to the M backup selection cases and the M energies collected at the relay node a final packet determination module configured to determine the final packet selection based on the M power splitting coefficients and the M energy determinations collected at the relay node. The final grouping determination module includes: a performance value determining unit configured to determine M system performance values based on the M power splitting coefficients and the M energies collected at the relay node. The maximum value determining unit is configured to determine the power division coefficient corresponding to the maximum value among the M system performance values and the corresponding energy reserve backup group selection is determined as the final group selection. The power allocation unit is used to allocate system power based on the primary and secondary users determined by the final group selection.

6. The power distribution device for a 5G-based wireless power-carrying NOMA cooperative system according to claim 5, characterized in that, The primary / secondary selection module includes: The user information acquisition unit is used to acquire user information of M users in the current NOMA collaboration system, wherein the M users include: the first user and the second user; The first selection unit is used to select the first user as the primary user and the second user as the secondary user to obtain the first backup group selection; The second selection unit is used to select the second user as the primary user and the first user as the secondary user to obtain a second backup group selection.

7. The power distribution device for a 5G-based wireless power-carrying NOMA cooperative system according to claim 6, characterized in that, The coefficient energy determination module includes: a first group determining unit, configured to determine, for a first backup group selection, a user as a primary user, a user as a secondary user, a signal received at the relay node is determined as: ; wherein, , respectively represent power allocation coefficients, represent the transmission power of the transmitting end, , are demodulation signals of the primary user and the secondary user respectively; A first signal-to-noise ratio determining unit is configured to determine a signal-to-noise ratio of a signal received by the relay node based on a signal-to-noise ratio of a signal received by the relay node ; A first coefficient power determination unit is configured to obtain , , a condition to be satisfied at the relay node , ; determine a power allocation coefficient 、 expressions and the value of the power splitting coefficient at the relay node: ; where the noise in the system obeys a Gaussian distribution with mean 0 and variance , and the average signal-to-noise ratio of the system is defined as ; when , all the energy carried in the received signal at the relay node is used to demodulate the signal; the energy collected at the relay node is , where , where represents the energy conversion efficiency.

8. An electronic device comprising a processor and a memory having a computer program stored therein, characterized in that, When the processor executes the computer program, it implements the steps of the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system as described in any one of claims 1 to 4.

9. A processor-readable storage medium, comprising: The processor-readable storage medium stores a computer program for causing the processor to perform the steps of the power allocation method for a 5G-based wireless power-carrying NOMA cooperative system according to any one of claims 1 to 4.

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