KR102225750B1 - Method and system for transmitting secure data using power back-off - Google Patents

Abstract

The present invention uses a power backoff technique in a single cell uplink non-orthogonal multiple access system (NOMA) to maximize the security data rate while ensuring the data rate of the legitimate user. It relates to a method and system, comprising the steps of classifying a security user or an information user according to a channel size of each legitimate user paired with a non-orthogonal multiple access (NOMA) system, and power back-off. off) using a method of receiving a received signal according to the power allocated to the security user or the information user, and decoding the received signal through a sequential interference cancellation method, so that the channel size is relatively strong among the legitimate users. And maximizing the security data transmission rate of the security user, which guarantees the data transmission rate of the information user and has a relatively weak channel size.

Description

Security data transmission method and system using power back-off technique {METHOD AND SYSTEM FOR TRANSMITTING SECURE DATA USING POWER BACK-OFF}

The present invention relates to a secure data transmission method and system using a power backoff technique, and more particularly, power in a single cell uplink non-orthogonal multiple access system (NOMA). The present invention relates to a method and system for maximizing a security data transmission rate while ensuring a data transmission rate of a legitimate user using a backoff technique.

Non-Orthogonal Multiple Access (NOMA) is one of the promising technologies for Beyond 5G, and is a technology that is being actively studied in recent years. It is spotlighted as a technology that can satisfy various communication requirements with low latency, high reliability, huge connectivity and improved fairness.

The core idea of the non-orthogonal multiple access system (NOMA system) is to support the communication service of multiple users in one of the time resource, the frequency resource, or the code resource. Since the non-orthogonal multiple access system is a system that supports communication services of multiple users using power layer multiplexing within a single resource, interference with signals increases compared to the existing Orthogonal Multiple Access (OMA) system. . In order to remove such interference, the non-orthogonal multiple access method uses a sequential interference cancellation method.

If the sequential interference cancellation method is used, information of multiple users allocated to a single resource can be detected. That is, if the sequential interference cancellation method is used, overlapping signals can be removed. In detail, the receiver using the sequential interference cancellation method first detects a signal having a virtual high signal size among the overlapping signals, and treats the remaining signals as noise. Thereafter, the largest detected signal is removed from the overlapped signal, and then the next largest signal is detected and removed from the overlapped signal. As described above, in a non-orthogonal multiple access system using a sequential interference cancellation method, the amount of information detected is determined according to a power difference between user information. In particular, in the case of an uplink, transmission power and a channel may be important parameters for power strength between information. Therefore, in order to obtain a high transmission rate, an appropriate transmission power allocation scheme in consideration of a channel between users and a base station is required.

Unlike existing cryptography-based security methods, physical layer security technology is a new security method that uses the physical characteristics of a wireless communication environment, and is attracting attention as a new security method that can be applied to the Internet of Things in the Beyond 5G era. Techniques for physical layer security are being grafted to various wireless communication systems, but physical layer security techniques for uplink non-orthogonal multiple access have not been developed.

Accordingly, in the present invention, when an eavesdropper attempts eavesdropping in a non-orthogonal multiple access system, the transmission power considering the channel size between the base station and the legitimate user to maximize the security data rate while ensuring the data rate of the legitimate user, and the maximum transmit power of the system. We propose a control method, Power Back-Off.

An object of the present invention is to use a power backoff scheme, which is a transmission power control method that considers the channel size between a base station and a legitimate user and the maximum transmission power of the system. We want to maximize the security data transfer rate, a measure that cannot be done.

In addition, it is an object of the present invention to have a higher security data rate compared to the existing uplink power control technique when an eavesdropper attempts eavesdropping through power backoff, which is a transmission power control technique, and secure data while ensuring the user's data rate. You want to maximize the transmission rate.

The secure data transmission method using the power backoff technique according to an embodiment of the present invention provides a security user or information user according to the channel size of each legitimate user paired with a non-orthogonal multiple access (NOMA) system. Classifying, receiving a received signal based on power allocated to the security user or the information user using a power back-off technique, and decoding the received signal through a sequential interference cancellation method, And ensuring a data transmission rate of the information user having a relatively strong channel size among legitimate users, and maximizing a security data transmission rate of the security user having a relatively weak channel size.

Classifying the security user or the information user may classify the security user with a weak channel or the information user with a strong channel among the legitimate users paired with the non-orthogonal multiple access system according to a channel size.

The step of classifying the security user or the information user considers the size of the maximum transmission power allocated to the non-orthogonal multiple access system and the size of the channel at each instant, and the data transmission rate is guaranteed and the security data transmission rate is maximized according to a channel change. A security user or a user of the information can be distinguished.

The receiving of the received signal allocates power to the security user or the information user using the power backoff technique, and transmits power according to the allocated power and the transmission message from the security user or the information user. It can receive a received signal.

The receiving of the received signal may allocate power for the received signal of the security user or the information user by using an optimal power backoff parameter calculated through the power backoff technique.

In the case of decoding using the sequential interference cancellation method, which is a data decoding method, the step of securing the data transmission rate by decoding and maximizing the security data transmission rate is performed by assigning appropriate power to the received signal received from the security user or the information user. Through this, the data transmission rate is guaranteed, and the security data transmission rate can be maximized.

In the step of securing the data transmission rate by decoding and maximizing the security data transmission rate, the optimal security data transmission rate may be increased in consideration of the data transmission rate of the legitimate users through the power back-off method, which is a transmission power control method.

The secure data transmission system using the power backoff technique according to an embodiment of the present invention provides a security user or an information user according to the channel size of each legitimate user paired with a non-orthogonal multiple access (NOMA) system. A classification unit that classifies, an acquisition unit that receives a received signal by power allocated to the security user or the information user using a power back-off technique, and decodes the received signal through a sequential interference cancellation method. Thus, the data transmission rate of the information user having a relatively strong channel size among the legitimate users is guaranteed, and an application unit maximizing the security data transmission rate of the security user having a relatively weak channel size is included.

The classification unit may classify the security user with a weak channel or the information user with a strong channel from among the legitimate users paired with the non-orthogonal multiple access system according to a channel size.

The classification unit considers the size of the maximum transmission power allocated to the non-orthogonal multiple access system and the channel size at each moment, and distinguishes the security user or the information user for securing a data transmission rate and maximizing a security data transmission rate according to a channel change. I can.

The acquisition unit allocates power to the security user or the information user using the power backoff technique, and receives the transmission power according to the allocated power and the received signal of the transmission message from the security user or the information user. I can.

The acquisition unit may allocate power for the received signal of the security user or the information user by using an optimal power backoff parameter calculated through the power backoff technique.

In the case of decoding using the sequential interference cancellation method, which is a data decoding method, the application unit guarantees a data transmission rate through appropriate power allocation to the received signal received from the security user or the information user, and maximizes the security data transmission rate. I can.

The application unit may increase the optimal security data transmission rate in consideration of the data transmission rate of the legitimate users through the power back-off method, which is a transmission power control method.

According to an embodiment of the present invention, by using the power backoff technique, it is possible to increase the maximum security data rate considering limited resources in consideration of the maximum transmission power allocated to the channels of users and the base station and the non-orthogonal multiple access system. .

In addition, according to an embodiment of the present invention, when there is an eavesdropper, the security data transmission rate at the physical layer can be maximized, and thus, additional follow-up measures for maintaining the security of the communication system can be facilitated.

1 is a conceptual diagram illustrating a non-orthogonal multiple access (NOMA) system according to an embodiment of the present invention.
2 is a flowchart illustrating an operation of a method for transmitting secure data using a power back-off technique according to an embodiment of the present invention.
3 is a graph showing the security data transmission rate with respect to the target received power.
4 is a graph showing a system transmission rate for a target received power.
5 is a block diagram showing a detailed configuration of a secure data transmission system using a power backoff technique according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. In addition, the same reference numerals shown in each drawing indicate the same member.

In addition, terms used in the present specification are terms used to properly express preferred embodiments of the present invention, which may vary according to the intention of viewers or operators, or customs in the field to which the present invention belongs. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

In the non-orthogonal multiple access system for physical layer security according to an embodiment of the present invention, when there is another unintended receiver in the network, i.e., an eavesdropper, a high security data rate is obtained while ensuring the data rate of legitimate users with a single antenna. The point is to do it.

For this, it must precede the information transmission step, which is an optimal transmission power control scheme for uplink non-orthogonal multiple access.

The sequential interference cancellation method (SIC) used in non-orthogonal multiple access can detect information of multiple users sharing a single resource, and is an increased signal compared to the conventional orthogonal multiple access method (OMA). Can minimize interference to Therefore, in a non-orthogonal multiple access system, an uplink transmission power control method different from the conventional orthogonal multiple access system is essential in consideration of the sequential interference cancellation method and the characteristics of the system.

When the sequential interference cancellation scheme is used in an uplink non-orthogonal multiple access system, the amount of information of each multi-user allocated to a single resource is determined by the channels and transmission power of the users. However, when there are eavesdroppers as well as legitimate users in a non-orthogonal multiple access network, not only the data rate of users but also the security data rate, which is a measure that cannot be eavesdropped, becomes an important system parameter.

Therefore, in the present invention, when an eavesdropper attempts eavesdropping in a non-orthogonal multiple access system, the optimal transmission power control method that can obtain the maximum secure data rate while ensuring the data rate of a legitimate user is a power back-off technique. off).

The present invention will be described with reference to FIGS. 1 to 5 as follows.

1 is a conceptual diagram illustrating a non-orthogonal multiple access (NOMA) system according to an embodiment of the present invention.

1, an uplink non-orthogonal multiple access system with two legitimate users (User1, User2) and one eavesdropper (Eavesdropper) according to an embodiment of the present invention (Non Orthogonal Multiple Access; NOMA, 100) is a schematic diagram. In this case, the communication system considered in the present invention is a non-orthogonal multiple access system 100, which is a resource allocation method for multiple users through a power layer multiplexing method on a single resource.

The non-orthogonal multiple access system 100 may be composed of a base station having a single antenna and K single antenna users (User1, User2) who are targets to provide a communication service. At this time, the eavesdropper having a single antenna decodes and intercepts the signals of the legitimate users (User1, User2).

The details of the present invention are described in the following steps, each step is 1) a secure data rate acquisition step for obtaining a secure data rate in an uplink non-orthogonal multiple access system model, and 2) an uplink non-orthogonal multiple access It can consist of configuring a power backoff scheme for the maximum secure data rate of the system.

, 적법한 사용자들(Users)과 도청자(Eavesdropper) 사이의 채널은

으로 나타낸다. 1) In the step of obtaining a secure data rate, consider a non-orthogonal multiple access system in a situation in which M users among K user terminals are paired. At this time, the channel between the base station and legitimate users

, The channel between legitimate users (Users) and eavesdroppers (Eavesdropper)

Represented by

은 m번째 적법한 사용자와 기지국 및 도청자 사이의 소규모 페이딩을 나타내고,

은 m번째 적법한 사용자와 기지국 및 도청자 사이의 대규모 페이딩을 나타낸다. here,

Represents a small fading between the mth legitimate user and the base station and eavesdropper,

Represents the massive fading between the mth legitimate user and the base station and eavesdropper.

[Equation 1]

는 각각 기지국과 사용자, 그리고 도청자와 사용자 사이의 소규모 페이딩 채널에 대한 확률 밀도 함수를 나타낸다. here,

Represents the probability density function for the small fading channel between the base station and the user, and the eavesdropper and the user, respectively.

[Equation 2]

는 거리 손실 계수를 나타낸다. 이때, 채널 h_m은 시스템 내의 기지국에게 알려져 있다고 가정한다. Here, d _m represents the distance between each m-th legitimate user and the base station,

Denotes the distance loss coefficient. At this time, _{it is assumed that the channel h m} is known to the base station in the system.

The base station allocates an order of paired users by comparing the channel gain size. For example, when two people are paired, the base station may allocate 1 for a user with a large channel gain and 2 for a small user.

[Equation 3]

Signals sent by paired users are as shown in [Equation 4] below.

[Equation 4]

번 사용자의 송신 전력과 전송 메시지를 의미한다. Where pi and si are respectively

It means the transmit power and transmit message of user.

In addition, data received by the base station on signals sent by paired users is as shown in [Equation 5] below.

[Equation 5]

은 백색 가우시안 잡음을 의미한다. here,

Means white Gaussian noise.

In a non-orthogonal multiple access system, a base station uses a sequential interference cancellation scheme to decode a received signal. At this time, the data rate of the m-th user that can be achieved in each base station is as shown in [Equation 6] below.

[Equation 6]

In the non-orthogonal multiple access system, the eavesdropper also uses a sequential interference cancellation scheme. In the present invention, it is assumed that the eavesdropper's detection ability is superior to that of a legitimate user in order to assume the worst security situation. Accordingly, the data transmission rate of the m-th user that the eavesdropper can achieve is as shown in [Equation 7] below.

[Equation 7]

은 도청자와 m번째 사용자 사이의 채널을 나타낸다. here,

Represents the channel between the eavesdropper and the m-th user.

In addition, by using the above-described [Equation 6] and [Equation 7], the security transmission rate can be expressed as shown in [Equation 8] below.

[Equation 8]

이다. here,

to be.

Finally, the present invention uses power backoff for non-orthogonal multiple access. At this time, the transmission power of the m-th user is defined as follows.

[Equation 9]

는 가장 강한 채널의 사용자(m번째 사용자)의 목표 수신 전력을 나타내고,

는 전력 백오프 매개변수를 나타낸다. here,

Represents the target reception power of the user of the strongest channel (mth user),

Denotes the power backoff parameter.

Furthermore, in the step of 2) configuring the power backoff scheme, unlike the existing uplink transmission power control scheme, we propose a transmission power control scheme that considers the security data rate. In particular, a case in which two users (User1, User2) are paired (M=2) in a non-orthogonal multiple access is considered, and a case in which transmission power is limited to the entire system is considered.

[Equation 10]

Here, P represents the transmission power allocated to the entire system.

In a non-orthogonal multiple access system, user 1 with a weaker channel is more vulnerable to eavesdropping than user 2 with a relatively good channel among paired users. Accordingly, in the power backoff method, which is a transmission power control method in consideration of the security data rate, among paired users, a weak channel user is designated as a security user and a strong channel user is designated as an information user. Accordingly, the present invention proposes a power backoff scheme that guarantees a data rate of a user of a strong channel among paired users in a non-orthogonal multiple access system and maximizes the security data rate of a weak channel.

[Equation 11]

는

인 경우 하기의 수식들([수식 12], [수식 13])을 통해 오목함수 임을 알 수 있다. Here, Q denotes a data requirement constant for ensuring a data rate of a strong user among paired users. [Equation 11] is a method capable of controlling the transmission power for the maximum security transmission rate at each instant in consideration of the maximum transmission power of the channel and the system. Objective function

Is

In the case of, it can be seen that it is a concave function through the following equations ([Equation 12], [Equation 13]).

[Equation 12]

를 이용하여 이차 미분을 하면 하기의 [수식 13]과 같다.Here, log() can be omitted because it is a monotonically increasing function. Therefore, the security outage probability function omitting log()

If the second derivative is performed by using, it is as shown in [Equation 13] below.

[Equation 13]

를 하기의 [수식 14]와 같이 변형한다.Objective functions for the optimization parameters p1 and p2 to use the linear programming algorithm, one of the optimization techniques.

Is transformed as shown in [Equation 14] below.

[Equation 14]

As a result, the equation for obtaining the optimal power backoff parameter can be modified as shown in [Equation 15] below.

[Equation 15]

은 강한 채널 사용자에 대한 신호 대 잡음비 요구 상수를 나타낸다. 최종적으로 변형된 최적화 식인 [수식 15]에 선형 계획법 알고리즘을 사용하여 최적의 전력 백오프 매개변수를 쉽게 획득할 수 있다.here,

Denotes the signal-to-noise ratio demand constant for strong channel users. Finally, the optimal power backoff parameter can be easily obtained by using a linear programming algorithm in [Equation 15], which is a modified optimization equation.

The power backoff scheme, which is a transmission power control method according to an embodiment of the present invention, considers a data transmission rate of a legitimate user and has an optimal security transmission rate. In addition, since it is a method that considers the size of the maximum transmission power allocated to the system and the channel size at each moment, it is possible to apply an appropriate power backoff technique according to a change in channel.

2 is a flowchart illustrating an operation of a method for transmitting secure data using a power back-off technique according to an embodiment of the present invention.

The method of FIG. 2 is performed by the secure data transmission system using the power backoff technique according to the embodiment of the present invention shown in FIG. 5.

Referring to FIG. 2, in step 210, a security user or an information user is classified according to a channel size of each of the legitimate users paired with a non-orthogonal multiple access (NOMA) system.

The base station may compare the channel gain size and allocate the order of users paired to the system. For example, when two people are paired, 1 is assigned to a user with a large channel gain and 2 is assigned to a small user. Accordingly, in step 210, among legitimate users paired with the non-orthogonal multiple access system, security users with weak channels or information users with strong channels may be classified according to the channel size.

The present invention may consider the size of the maximum transmission power allocated to the non-orthogonal multiple access system, and the channel size at each instant. Accordingly, step 210 considers the size of the maximum transmission power allocated to the non-orthogonal multiple access system and the size of the channel at each moment, and according to the channel change, it is possible to distinguish between a security user or an information user to ensure a data rate and maximize the security data rate. have.

In step 220, a received signal according to power allocated to a security user or an information user is received using a power back-off technique.

Step 220 may allocate power to the security user or the information user using a power backoff technique, and receive a transmission power according to the allocated power and a reception signal of a transmission message from the security user or the information user. More specifically, step 220 may allocate power for a received signal of a security user or information user by using an optimal power backoff parameter calculated through a power backoff technique.

At this time, the power backoff parameter is calculated by the above-described [Equation 11] to [Equation 15], and the power backoff parameter calculated through the power backoff technique is data of each legitimate user (for example, transmission It may be allocated to power and power for transmission of a received signal of a transmitted message).

That is, the secure data transmission method using the power back-off method according to the embodiment of the present invention uses a data decoding method of a sequential interference cancellation method, so unlike the conventional orthogonal system method, the data transmission rate is guaranteed and the security data transmission rate is maximized. It is characterized by using a power back-off technique, which is a power allocation scheme.

In step 230, the received signal is decoded through a sequential interference cancellation method to guarantee a data transmission rate of an information user with a relatively strong channel size among legitimate users, and maximize a security data transmission rate of a security user with a relatively weak channel size.

In this case, the security data rate may represent a value obtained by subtracting the data rate of legitimate users decoded by the eavesdropper from the data rate of legitimate users decoded by the base station.

In a non-orthogonal multiple access system, a base station may use a sequential interference cancellation scheme to decode a received signal. The sequential interference cancellation method (SIC) can detect information of multiple users sharing a single resource, and can minimize interference with increased signals compared to the existing Orthogonal Multiple Access (OMA) method. have. Therefore, in a non-orthogonal multiple access system, an uplink transmission power control method different from the conventional orthogonal multiple access system is essential in consideration of the sequential interference cancellation method and the characteristics of the system.

In step 230, when decoding is performed using the sequential interference cancellation method, which is a data decoding method, the data transmission rate is guaranteed by appropriate power allocation to the received signal received from the security user or the information user, which is the legitimate user, and the security data transmission rate can be maximized. have. In this case, step 230 may increase the optimal security data transmission rate in consideration of the data transmission rate of legitimate users through a power back-off method, which is a transmission power control method.

That is, the secure data transmission method using the power back-off method according to the embodiment of the present invention uses the power back-off method, so that when decoding data transmitted by legitimate users, it is intended to increase the data transmission rate through appropriate power allocation. Furthermore, it is intended to improve the security data transmission rate in the data transmission rate.

3 is a graph showing the security data transmission rate with respect to the target received power.

를 증가시키면서 본 발명의 실시예에 따른 검출 방식인 전력 백오프 방식(Proposed scheme)을 사용했을 경우와 기존 LTE 등의 셀룰러 망에서 사용하는 상향 링크 송신 전력 제어 기술(Conventional scheme)을 사용했을 경우의 보안 데이터 전송률을 비교하였다.In Figure 3, the target received power parameter

In the case of using a power backoff scheme (Proposed scheme), which is a detection method according to an embodiment of the present invention while increasing, and when using an uplink transmission power control technology (Conventional scheme) used in a cellular network such as existing LTE. The security data transfer rates were compared.

As can be seen from FIG. 3, it can be seen that the scheme proposed by the present invention has a significantly higher security transmission rate than the conventional scheme. Accordingly, it can be seen that the system security rate of the non-orthogonal multiple access network can be maximized through a power back-off method for secure data transmission.

4 is a graph showing a system transmission rate for a target received power.

를 증가시키면서 본 발명의 실시예에 따른 검출 방식인 전력 백오프 방식(Proposed scheme)을 사용했을 경우와 기존 LTE 등의 셀룰러 망에서 사용하는 상향 링크 송신 전력 제어 기술(Conventional scheme)을 사용했을 경우의 시스템 전송률을 비교하였다. 여기서, 시스템 전송률은 보안 데이터 전송률과 고려하는 데이터 전송률의 합을 의미한다. In Figure 4, the target received power parameter

In the case of using a power backoff scheme (Proposed scheme), which is a detection method according to an embodiment of the present invention while increasing, and when using an uplink transmission power control technology (Conventional scheme) used in a cellular network such as existing LTE. The system transmission rates were compared. Here, the system transmission rate means the sum of the security data transmission rate and the considered data transmission rate.

As can be seen from FIG. 4, it can be seen that the scheme proposed by the present invention can obtain a higher system transmission rate compared to the conventional scheme.

Accordingly, it can be seen that the power back-off method is a method of maximizing the security data transmission rate while ensuring the data transmission rate of the legitimate user, and thus it can be seen that a high system transmission rate as well as a high security data transmission rate can be obtained compared to the conventional method. That is, referring to FIGS. 3 and 4, it can be seen that the power back-off method according to an embodiment of the present invention increases system security, and also increases system efficiency and fairness.

5 is a block diagram showing a detailed configuration of a secure data transmission system using a power backoff technique according to an embodiment of the present invention.

5, a secure data transmission system using a power backoff technique according to an embodiment of the present invention provides power in a single cell uplink non-orthogonal multiple access system (NOMA). By using a back-off technique, the data rate of the legitimate user is guaranteed while maximizing the security data rate.

To this end, the secure data transmission system 500 using a power backoff technique according to an embodiment of the present invention includes a classification unit 510, an acquisition unit 520, and an application unit 530.

The classification unit 510 classifies security users or information users according to the channel size of each of the legitimate users paired with a non-orthogonal multiple access (NOMA) system.

The classification unit 510 may classify a weak channel security user or a strong channel information user according to a channel size among legitimate users paired with the non-orthogonal multiple access system.

The secure data transmission system 500 using the power backoff technique according to an embodiment of the present invention may consider the size of the maximum transmission power allocated to the non-orthogonal multiple access system, and the channel size of each instant. Accordingly, the classification unit 510 considers the size of the maximum transmission power allocated to the non-orthogonal multiple access system and the channel size at each moment, and the security user or information user for securing the data transmission rate and maximizing the security data transmission rate according to the channel change. Can be distinguished.

The acquisition unit 520 receives a received signal based on power allocated to a security user or an information user using a power back-off technique.

The acquisition unit 520 may allocate power to a security user or an information user using a power backoff technique, and receive a transmission power based on the power allocated from the security user or the information user and a reception signal of a transmission message. More specifically, the acquisition unit 520 may allocate power for a received signal of a security user or an information user by using an optimal power backoff parameter calculated through a power backoff technique.

That is, the secure data transmission system 500 using the power backoff method according to the embodiment of the present invention uses a data decoding method of a sequential interference cancellation method, so unlike the conventional orthogonal system method, the data transmission rate is guaranteed, and the security data It is characterized by using a power backoff technique, which is a power allocation scheme that maximizes a transmission rate.

The application unit 530 guarantees the data transmission rate of information users with a relatively strong channel size among legitimate users by decoding the received signal through a sequential interference cancellation method, and maximizes the security data transmission rate of security users with relatively weak channel sizes. do.

When decoding using the sequential interference cancellation method, which is a data decoding method, the application unit 530 guarantees the data transmission rate by allocating appropriate power to the received signal received from the security user or the information user, which is the legitimate user, and ensures the security data transmission rate. Can be maximized. In this case, the application unit 530 may increase the optimal security data transmission rate in consideration of the data transmission rate of legitimate users through a power back-off method, which is a transmission power control method. The security data rate may represent a value obtained by subtracting the data rate of legitimate users decoded by the eavesdropper from the data rate of legitimate users decoded by the base station.

That is, the secure data transmission system 500 using the power back-off method according to the embodiment of the present invention uses a power back-off method, so that when decoding data transmitted by legitimate users, the data transmission rate is determined through appropriate power allocation. It is to increase, and furthermore, to improve the security data transfer rate in the data transfer rate.

Although the description of the system of FIG. 5 is omitted, it is obvious to those skilled in the art that the system according to the present invention may include all the contents described in FIGS. 1 to 4.

The apparatus described above may be implemented as a hardware component, a software component, and/or a combination of a hardware component and a software component. For example, the devices and components described in the embodiments are, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA). , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions, such as one or more general purpose computers or special purpose computers. The processing device may execute an operating system (OS) and one or more software applications executed on the operating system. Further, the processing device may access, store, manipulate, process, and generate data in response to the execution of software. For the convenience of understanding, although it is sometimes described that one processing device is used, one of ordinary skill in the art, the processing device is a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of these, configuring the processing unit to operate as desired or processed independently or collectively. You can command the device. Software and/or data may be interpreted by a processing device or, to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodyed in a transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the embodiment, and vice versa.

As described above, although the embodiments have been described by the limited embodiments and drawings, various modifications and variations are possible from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as systems, structures, devices, circuits, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and those equivalent to the claims also fall within the scope of the claims to be described later.

Claims (14)

Classifying a security user or an information user according to a channel size of each of the legitimate users paired with a Non-Orthogonal Multiple Access (NOMA) system;
Receiving a received signal based on power allocated to the security user or the information user by using a power back-off technique, which is a power allocation method for maximizing a security data transmission rate; And
Decoding the received signal through a sequential interference cancellation method to ensure the data transmission rate of the information user with a relatively strong channel size among the legitimate users, and maximizing the security data transmission rate of the security user with a relatively weak channel size. Including,
Receiving the received signal
Allocating power to the security user or the information user using the power backoff technique, and receiving a transmission power according to the allocated power and the received signal of a transmission message from the security user or the information user, the A power backoff parameter calculated through a power backoff technique is used to allocate power for the data transmission and the received signal of the security user or the information user,
The step of decrypting to guarantee a data transmission rate and maximizing a security data transmission rate is
The data transmission rate is guaranteed through appropriate power allocation to the received signal received from the security user or the information user by decoding using the sequential interference cancellation method, which is a data decoding method, and the power backoff method, which is a transmission power control method, is used. The secure data transmission method using a power back-off technique, characterized in that the optimal security data transmission rate is increased in consideration of the data transmission rate of the legitimate users. The method of claim 1,
Classifying the security user or information user
A method of transmitting secure data using a power back-off technique for classifying the security user of a weak channel or the information user of a strong channel according to a channel size among the legitimate users paired with the non-orthogonal multiple access system. The method of claim 2,
Classifying the security user or information user
Considering the size of the maximum transmission power allocated to the non-orthogonal multiple access system and the channel size at each moment, and distinguishing the security user or the information user for securing a data rate according to a channel change and maximizing the security data rate. Characterized in, a secure data transmission method using a power back-off technique. delete delete delete delete A classification unit for classifying security users or information users according to the channel size of each of the legitimate users paired with the Non-Orthogonal Multiple Access (NOMA) system;
An acquisition unit receiving a received signal according to the power allocated to the security user or the information user by using a power back-off method, which is a power allocation method for maximizing a security data transmission rate; And
An application of decoding the received signal through a sequential interference cancellation method to ensure the data rate of the information user with a relatively strong channel size among the legitimate users, and maximizing the security data rate of the security user with a relatively weak channel size. Including wealth,
The acquisition unit
Allocating power to the security user or the information user using the power back-off technique, receiving a transmission power according to the allocated power and the received signal of a transmission message from the security user or the information user, and the power It is characterized in that the power for the data transmission and the received signal of the security user or the information user is allocated using an optimal power backoff parameter calculated through a backoff technique,
The application part
The data transmission rate is guaranteed through appropriate power allocation to the received signal received from the security user or the information user by decoding using the sequential interference cancellation method, which is a data decoding method, and the power backoff method, which is a transmission power control method, is used. The secure data transmission system using a power backoff technique, characterized in that to increase the optimal security data transmission rate in consideration of the data transmission rate of the legitimate users. The method of claim 8,
The classification unit
A secure data transmission system using a power backoff technique for classifying the security user of a weak channel or the information user of a strong channel according to a channel size among the legitimate users paired with the non-orthogonal multiple access system. The method of claim 9,
The classification unit
Considering the size of the maximum transmission power allocated to the non-orthogonal multiple access system and the channel size at each moment, and distinguishing the security user or the information user for securing a data rate according to a channel change and maximizing the security data rate. Characterized in, a secure data transmission system using a power back-off technique. delete delete delete delete

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