KR20200085429A - Method and system for selecting adaptive duplex relay mode using cooperative jamming - Google Patents

Abstract

The present invention relates to a method for selecting an adaptive duplex relay mode according to the probability of security failure in a security relay system using cooperative jamming and a system thereof. According to the present invention, the method comprises the steps of: performing the receiving node-based cooperative jamming; comparing the secrecy outage probability of a full-duplex relay mode and a half-duplex relay mode according to the size of the residual self-interference signal generated by the cooperative jamming; and selecting a duplex relay mode of the full-duplex relay mode or the half-duplex relay mode of a duplex communication method according to the comparison result.

Description

METHOD AND SYSTEM FOR SELECTING ADAPTIVE DUPLEX RELAY MODE USING COOPERATIVE JAMMING}

The present invention relates to a method and system for selecting an adaptive dual relay mode using collaborative jamming, and to a method and system for selecting an adaptive dual relay mode according to a probability of security failure in a security relay system using collaborative jamming.

In a wireless communication environment, the relay system enables a wider range of communication. In general, a relay system is composed of a transmitting node, a relay node, and a receiving node, and is classified into a half-duplex relay system and a full-duplex relay system according to the dual communication method of the relay node.

In the half-duplex relay method, the relay node receives the signal from the transmitting node, and then retransmits it using a channel different from the channel of the received signal. Since different channels are used for transmission and reception, there is a loss in resource efficiency. For example, if a relay node uses two time slots for transmission/reception, a loss occurs in terms of the amount of time, and the information transmission rate is halved.

On the other hand, since the full-duplex relay method transmits/receives at the relay node, since it is performed in the same channel, there is no loss in terms of resource efficiency. However, since transmission/reception is performed in the same channel at the relay node, a signal to be transmitted is received again, resulting in self-interference, thereby deteriorating performance.

That is, in the case of a half-duplex relay system, information transmission rate loss occurs in terms of resource efficiency, and in a full-duplex relay system, information transmission rate loss due to self-interference occurs. Therefore, through proper control of the self-interference signal, the full-duplex relay scheme can guarantee a greater information transmission rate than the half-duplex relay scheme. In order to prevent the loss of information rate due to the self-interference, the self-interference cancellation technique is essential in a full-duplex relay system.

The self-interference cancellation technique largely uses antenna separation, analog domain, and digital domain cancellation techniques, and a residual self-interference signal is generated in the process of removing the self-interference. Therefore, in order to accurately compare the performance of the half-duplex relay method and the full-duplex relay method, it is necessary to consider residual magnetic interference in the full-duplex relay method, but there is a limitation that the existing technology does not reflect this.

The present invention is to provide a method and system for selecting a dual relay mode having a better security performance among a half-duplex relay method or a full-duplex relay method according to the residual self-interference performance of the full-duplex relay system.

In addition, the present invention can secure a security area around a relay node and a receiving node, and selects a dual relay mode with better security performance between half-duplex relay method and full-duplex relay method according to the self-interference cancellation technique of the full-duplex relay system. And systems.

In a relay selection method for selecting an adaptive dual relay mode between a receiving node and a relay node in a secure relay system using collaborative jamming according to an embodiment of the present invention, performing the cooperative jamming based on the receiving node Step, according to the size of the residual self-interference signal (Residual Self-Interference) generated due to the cooperative jamming Full-Duplex (Full-Duplex) relay mode and half-duplex (Half-Duplex) security failure probability (Secrecy Outage Probability) of the relay mode And selecting a dual relay mode of the full-duplex relay mode or the half-duplex relay mode among duplex communication methods according to the comparing step and the comparison result.

The step of performing the cooperative jamming may perform the full-duplex relay mode or the half-duplex relay mode using the cooperative jamming.

The step of performing the cooperative jamming includes receiving a cooperative jamming signal from the receiving node and receiving a confidential message from a transmitting node at the relay node, and amplifying the cooperative jamming signal and the confidential message at the relay node. And transmitting to the receiving node and the eavesdropper, and removing the cooperative jamming signal from the receiving node.

The step of removing the cooperative jamming signal includes the cooperative jamming among the cooperative jamming signal and the confidential message received from the relay node at the receiving node that knows channel information, the cooperative jamming signal and related information about the transmission power information. The signal can be removed.

Since the eavesdropper does not know the related information, the cooperative jamming signal among the cooperative jamming signal and the confidential message received from the relay node cannot be removed, and the step of removing the cooperative jamming signal is intended to be intercepted by the eavesdropper. The signal to interference noise (Signal to Interference Plus Noise Ratio; SINR) of the confidential message can be lowered.

Comparing the security failure probability may calculate a security region through the security failure probability in the full-duplex relay mode and the security failure probability in the half-duplex relay mode, and obtain a range of residual self-interference strength variables.

또는

조건에 따라 상기 전이중 중계 모드에서의 보안 실패 확률 및 상기 반이중 중계 모드에서의 보안 실패 확률 측면에서 우위를 가지는 중계 모드를 선택할 수 있다.The step of selecting the dual relay mode is based on the range of the residual self-interference variable.

or

Depending on the conditions, a relay mode having an advantage in terms of the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode may be selected.

The step of selecting the dual relay mode selects the full-duplex relay mode when the residual self-interference variable (a) is 0 to a* in the range of the residual self-interference variable, and the residual self-interference variable (a). When is a* to 1, the half-duplex relay mode may be selected.

In a relay selection system for selecting an adaptive dual relay mode between a receiving node and a relay node in a secure relay system using collaborative jamming according to an embodiment of the present invention, performing the cooperative jamming based on the receiving node The processing unit, according to the magnitude of the residual self-interference signal (Residual Self-Interference) generated by the cooperative jamming, Full-Duplex relay mode and Half-Duplex relay mode security failure probability (Secrecy Outage Probability) It includes a comparison unit for comparison and a selection unit for selecting a dual relay mode of the full-duplex relay mode or the half-duplex relay mode among duplex communication methods according to the comparison result.

The processing unit may perform the full-duplex relay mode or the half-duplex relay mode using the cooperative jamming.

The processing unit receives a cooperative jamming signal from the receiving node at the relay node, and receives a confidential message from the transmitting node, and amplifies the cooperative jamming signal and the confidential message at the relay node to amplify the receiving node and the wiretapping. It may include a transmission unit for transmitting to the party, and a removal unit for removing the cooperative jamming signal in the receiving node.

The removal unit may remove the cooperative jamming signal from the cooperative jamming signal and the confidential message received from the relay node at the receiving node that knows the channel information, the cooperative jamming signal and related information of the transmission power information.

The comparator may calculate a security region through the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode, and obtain a range of residual self-interference strength variables.

또는

조건에 따라 상기 잔여 자기 간섭 변수의 범위에서, 상기 잔여 자기 간섭 변수(a)가 0부터 a*까지인 경우 상기 전이중 중계 모드를 선택하고, 상기 잔여 자기 간섭 변수(a)가 a*부터 1까지인 경우 상기 반이중 중계 모드를 선택할 수 있다. The selection part of the range of the residual self-interference variable

or

Depending on conditions, in the range of the residual self-interference variable, when the residual self-interference variable (a) is from 0 to a*, the full-duplex relay mode is selected, and the residual self-interference variable (a) is from a* to 1 If it is, the half-duplex relay mode can be selected.

According to an embodiment of the present invention, by selecting a dual relay mode having better security performance according to the self-interference cancellation performance by the adaptive dual relay mode selection method, it is applicable regardless of the self-interference cancellation technique, and the security of the relay system Performance can be maximized.

Further, according to an embodiment of the present invention, it may be applicable to a general relay system by using only the relative position of the terminal and the power of the jamming signal by the secure area securing method.

In addition, according to an embodiment of the present invention, it is possible to select a dual relay mode having a lower security failure probability by comparing the security failure probability of the full-duplex relay system and the half-duplex relay system according to the residual self-interference parameter given by the self-interference cancellation technique. In addition, it can be applied regardless of the self-interference cancellation performance of the relay system, and through this, the security performance of the relay system can be controlled.

의 조건에서 잔여 자기 간섭 신호 변수에 대한 보안 실패 확률을 그래프로 도시한 것이다.
도 6은 본 발명의 일 실시예에 따른

의 조건에서 잔여 자기 간섭 신호 변수에 대한 보안 실패 확률을 그래프로 도시한 것이다.
도 7은 본 발명의 일 실시예에 따른 중계 선택 시스템의 세부 구성을 블록도로 도시한 것이다.
도 8은 본 발명의 일 실시예에 따른 처리부의 구성을 블록도로 도시한 것이다.1 is a conceptual diagram of a full-duplex relay system using cooperative jamming according to an embodiment of the present invention.
2 is a flowchart illustrating an operation for a relay selection method according to an embodiment of the present invention.
3 is a flowchart illustrating an operation for performing cooperative jamming according to an embodiment of the present invention.
4 is a graph illustrating the probability of security failure according to the position of the eavesdropper in a full-duplex relay system according to an embodiment of the present invention.
5 is according to an embodiment of the present invention

The probability of security failure for the residual self-interference signal variable under the condition of is shown graphically.
6 is according to an embodiment of the present invention

The probability of security failure for the residual self-interference signal variable under the condition of is shown graphically.
7 is a block diagram showing the detailed configuration of a relay selection system according to an embodiment of the present invention.
8 is a block diagram showing the configuration of a processing unit according to an embodiment of the present invention.

Hereinafter, embodiments according to 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 denote the same members.

In addition, terms used in the present specification (terminology) are terms used to properly express a preferred embodiment of the present invention, which may vary according to viewers, operators' intentions, or customs in the field to which the present invention pertains. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

It is an object of the present invention to select an adaptive dual relay mode according to a probability of security failure in a security relay system using cooperative jamming.

According to the present invention, the security failure probability according to the strength of residual self-interference signals inevitably generated according to a self-interference cancellation method in a security relay system capable of using a full-duplex relay mode We propose a method to secure a security area in the network by using (Secrecy Outage Probability), and a method of selecting a dual relay mode through comparison with a half-duplex relay mode.

Furthermore, the technology according to the present invention proposes a security area securing method in a relay system using cooperative jamming to prevent eavesdropping and secure the security area, and has better performance according to the residual self-interference signal removal performance We propose a way to select a relay mode.

Cooperative Jamming (Cooperative Jamming) is one of the physical layer security technologies based on cooperative relaying, and plays a role of interfering with eavesdropping by interfering with multiple nodes in the relay system. The cooperative jamming technique may perform jamming because there is a jammer node that transmits only the jamming signal in the relay system, and may also use beamforming using multiple antennas.

In the present invention, since it is assumed that all nodes in the relay system have a single antenna for transmission and reception, it is assumed that beamforming cannot be performed, and there is no additional node for performing cooperative jamming. Therefore, in order to perform jamming without disturbing reception of the receiving node, it is necessary to perform cooperative jamming based on the receiving node.

For example, in a half-duplex relay system, relaying based on a receiving node may be performed through two steps through amplification and transmission at a relay node. In the first step, the receiving node performs jamming, and the sending node sends a confidential message to the relay node. In the second step, the receiving node receives a signal obtained by combining the information transmitted by the transmitting node and the jamming signal transmitted by the transmitting node through relaying of the relay node. At this time, since the receiving node knows the channel information between the legitimate nodes, the transmission power information, and the cooperative jamming signal generated by itself, it is possible to completely remove the jamming signal relayed again from the relay node.

That is, the receiving node interferes with the reception of the eavesdropper through jamming, and is relatively unaffected by jamming. In the cooperative jamming based on the receiving node, since the relay node does not know information about the jamming signal, it is possible to effectively secure the security performance of the system even when relaying is performed through an unreliable relay node.

The present invention will be described with reference to FIGS. 1 to 7 as follows.

1 is a conceptual diagram of a full-duplex relay system using cooperative jamming according to an embodiment of the present invention.

The security relay system according to an embodiment of the present invention assumes a relay system consisting of a transmitting node, a relay node performing Amplify and Forward (AF), a receiving node, and an eavesdropper, and the receiving node and the eavesdropper are relay nodes. The signal is received only through. In addition, the relay node and the receiving node can perform full-duplex communication by using a single receiving antenna and a transmitting antenna, respectively.

The relay node receives the confidential message of the transmitting node and the jamming signal of the receiving node, and amplifies and relays them through transmission. The receiving node receives the signal from the relay node and transmits the jamming signal. At this time, since the receiving node knows its channel information and transmission power in advance, it is possible to remove the jamming signal transmitted by itself through the relay node.

,

,

및

으로 나타낸다. 이 때, 적법한 노드 간의 순시 채널 정보와 도청자의 채널 정보에 대한 통계적인 특성은 알려져 있다고 가정하며, 도청자의 채널은 평균 채널 전력이

와

인 레일리 페이딩 채널인 것으로 가정한다. The channel between the transmitting node and the relay node, the relay node and the receiving node, the relay node and the eavesdropper, and the receiving node and the eavesdropper are respectively

,

,

And

It is represented by. At this time, it is assumed that the statistical characteristics of instantaneous channel information between legitimate nodes and the channel information of the eavesdropper are known, and the average channel power of the eavesdropper channel is known.

Wow

It is assumed that this is an Rayleigh fading channel.

은 백색 부가 가우시안 잡음으로

를 따른다.Also, noise from all nodes

Silver white additive Gaussian noise

Follow.

In a relay system as shown in FIG. 1, the present invention can select an adaptive dual relay mode between a receiving node and a relay node using cooperative jamming.

2 is a flowchart illustrating an operation for a relay selection method according to an embodiment of the present invention, and FIG. 3 is a flowchart illustrating an operation for performing cooperative jamming according to an embodiment of the present invention.

2, the relay selection method according to an embodiment of the present invention performs cooperative jamming based on a receiving node (step 210). At this time, step 210 represents a step of performing a full-duplex relay mode or half-duplex relay mode using cooperative jamming in a full-duplex relay system or a half-duplex relay system in which magnetic interference does not occur according to an embodiment of the present invention shown in FIG. 1. , This may include a plurality of steps as shown in FIG. 3.

1 and 3, a relay node of a full-duplex relay system may receive a cooperative jamming signal from a receiving node and receive a confidential message from a transmitting node (step 310). For example, the receiving node may transmit a cooperative jamming signal to the eavesdropper to prevent eavesdropping from the eavesdropper, as well as the relay node.

Thereafter, the relay node may amplify and transmit the cooperative jamming signal and the confidential message received from the transmitting node and the receiving node to the receiving node and the eavesdropper (step 320). For example, the relay node may simultaneously receive the confidential message of the transmitting node and the cooperative jamming signal of the receiving node, and then perform amplification and transmission.

Since the receiving node knows relevant information about the channel information, the cooperative jamming signal, and the transmission power information, it is possible to remove the cooperative jamming signal from the cooperative jamming signal and the confidential message received from the relay node (step 330).

On the other hand, since the eavesdropper does not know the relevant information, the cooperative jamming signal among the cooperative jamming signal and the confidential message received from the relay node cannot be removed, thereby causing the signal-to-interference noise ratio of the confidential message that the eavesdropper intends to eavesdrop on. (Signal to Interference Plus Noise Ratio; SINR) can be lowered.

Referring to FIG. 2 again, security failure of a full-duplex relay mode and a half-duplex relay mode according to the magnitude of residual self-interference generated due to the cooperative jamming in step 210 The probability (Secrecy Outage Probability) is compared (step 220).

In step 220, the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode can be obtained and compared through [Equation 4] and [Equation 7] below. The scope of a) can be obtained. In addition, step 220 may calculate the security region through the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode.

According to the comparison result in step 220, a dual relay mode of a full duplex relay mode or a half duplex relay mode is selected from the duplex communication method (step 230).

또는

인 조건에 따라 전이중 중계 모드에서의 보안 실패 확률 및 반이중 중계 모드에서의 보안 실패 확률 측면에서 우위를 가지는 중계 모드를 선택할 수 있다. 보다 구체적으로, 단계 230은 잔여 자기 간섭 변수의 범위에서, 잔여 자기 간섭 변수(a)가 0부터

까지인 경우 전이중 중계 모드를 선택하고, 잔여 자기 간섭 변수(a)가

부터 1까지인 경우 반이중 중계 모드를 선택하는 것을 특징으로 한다. Step 230 has a range of residual self-interference parameters

or

Depending on the phosphorus condition, a relay mode having an advantage in terms of the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode may be selected. More specifically, in step 230, in the range of the residual self-interference variable, the residual self-interference variable (a) is from 0

If is, the full-duplex relay mode is selected, and the residual self-interference parameter (a) is

It is characterized by selecting the half-duplex relay mode in the case of from 1 to 1.

The relay selection method performed through this process will be described in detail below.

The content described below is a method of selecting an adaptive dual relay mode in a secure relay system according to an embodiment of the present invention, and is based on a full-duplex relay system and a half-duplex relay system using cooperative jamming shown in FIG. It shows a method of selecting a dual relay mode having better security performance among half-duplex relay method or full-duplex relay method according to the self-interference performance.

,

,

및

으로 나타내며, 적법한 노드 간의 순시 채널 정보와 도청자의 채널 정보에 대한 통계적인 특성은 알려져 있다고 가정한다.The channel between the transmitting node and the relay node, the relay node and the receiving node, the relay node and the eavesdropper, and the receiving node and the eavesdropper are respectively

,

,

And

It is assumed that the statistical characteristics of instantaneous channel information between legitimate nodes and channel information of an eavesdropper are known.

와

인 레일리 페이딩 채널인 것으로 가정한다. 즉,

와

는 도청자의 대규모 페이딩(Large scale fading)을 의미하며, 중계 노드와 도청자, 수신 노드와 도청자 사이의 거리에 반비례할 수 있다. In addition, the eavesdropper's channel has an average channel power

Wow

It is assumed that this is an Rayleigh fading channel. In other words,

Wow

Means large scale fading of the eavesdropper, and may be inversely proportional to the distance between the relay node and the eavesdropper, and the receiving node and the eavesdropper.

은 백색 부가 가우시안 잡음으로

을 따른다.Also, noise from all nodes

Silver white additive Gaussian noise

Follow.

는

로 가정한다. 또한, 각 분산은

로 나타내며,

는 시스템의 자기 간섭 신호 제거 기법에 의해 결정되는 변수를 나타낸다. 예를 들어, a=0인 경우, 자기 간섭 신호는 완벽히 제거됨을 의미하며, a=1인 경우, 송신 신호가 그대로 수신됨을 의미한다. Residual self-interference signal caused by not completely removing self-interference signal from relay node and receiving node

The

Is assumed to. Also, each variance

Denoted by

Denotes a variable determined by the system's self-interference signal cancellation technique. For example, when a=0, the self-interference signal is completely removed, and when a=1, the transmission signal is received as it is.

라 할 때, 하기의 [수학식 1]과 같이 나타낼 수 있다. 이 때, R은 중계 노드를 나타내고, D는 수신 노드를 나타내며, E는 도청자를 나타낸다. The signal received by each node

D, it can be expressed as [Equation 1] below. At this time, R represents a relay node, D represents a receiving node, and E represents an eavesdropper.

[Equation 1]

는 송신 노드에서 전송하는 기밀 메시지를 나타내고, 송신 노드의 송신 전력은

를 나타낸다. 또한,

는 수신 노드에서 수행하는 협력 재밍 신호를 나타내며, 수신 노드의 송신 전력은

를 나타낸다. 또한,

는 중계 노드의 증폭 계수(amplifying coefficient)를 나타내고,

는 중계 노드의 송신 전력으로 증폭 계수

를 나타낸다. here,

Indicates a confidential message transmitted by the transmitting node, and the transmitting power of the transmitting node is

Indicates. Also,

Indicates a cooperative jamming signal performed by the receiving node, and the transmitting power of the receiving node is

Indicates. Also,

Denotes the amplifying coefficient of the relay node,

Is the amplification factor as the transmit power of the relay node

Indicates.

는 하기의 [수학식 2]와 같이 표현된다.Since the receiving node can remove its own jamming signal received through the relay node,

Is expressed as [Equation 2] below.

[Equation 2]

와 도청자의 종단 간(End-To-End) 신호 대 간섭 및 잡음비

는 하기의 [수학식 3]과 같이 나타낼 수 있다. Using the above-described [Equation 1] and [Equation 2], the end-to-end signal to interference and noise ratio of the receiving node

End-to-end signal-to-interference and noise ratio

Can be expressed as [Equation 3] below.

[Equation 3]

를 나타내고,

를 나타낸다. here,

And

Indicates.

은 하기의 [수학식 4]와 같이 표현된다.Since the security performance considered in the adaptive dual relay mode selection method and the relay selection method proposed by the system according to an embodiment of the present invention is expressed through the security failure probability, the security failure probability of the full-duplex relay system using cooperative jamming

Is expressed as [Equation 4] below.

[Equation 4]

는 목표로 하는 보안 전송률을 나타낸다. here,

Indicates the targeted secure transfer rate.

는 랜덤 변수를 나타낸다. 그러므로,

는 하기의 [수학식 5]과 같이 나타낼 수 있다. Since the signal to interference and noise ratio (SINR) of the legitimate nodes in [Equation 4] described above are assumed to be known,

Denotes a random variable. therefore,

Can be expressed as [Equation 5] below.

[Equation 5]

및

는 지수(Exponential) 분포를 따르므로, 확률 밀도 함수의 변환을 이용하면

는 하기의 [수학식 6]과 같이 산출된다.As described above, in [Equation 5]

And

Is based on the exponential distribution, so using the transformation of the probability density function

Is calculated as [Equation 6] below.

[Equation 6]

가 증하는 경우, 보안 실패 확률이 감소하게 되므로, 주어진 환경에서 수신 노드 주변에 목표로 하는 보안 실패 확률을 포함하는 거리를 획득할 수 있다. 이로 인해, 본 발명은 보안 실패 확률을 이용하여 수신 노드 주변에 일정한 보안 성능을 가지는 보안 영역을 나타낼 수 있으며, 재밍 신호 전력을 제어하여 보안 영역을 확보할 수 있다. The above-described [Equation 6] can be used to represent the security area. Referring to FIG. 4, which shows the probability of security failure according to the location of the eavesdropper, the eavesdropper approaches the receiving node.

If increases, the probability of a security failure decreases, so that in a given environment, a distance including a target security failure probability can be obtained around a receiving node. For this reason, the present invention can represent a security area having a certain security performance around the receiving node by using the security failure probability, and secure the security area by controlling the jamming signal power.

와

를 고려한다. On the other hand, in the case of a half-duplex relay system using cooperative jamming, since there is no self-interference and relaying is performed in two steps, the signal-to-interference and noise ratio of the full-duplex relay system is

Wow

Consider.

은 하기의 [수학식 7]과 같이 표현된다. In this case, assuming that both dual relay systems (full-duplex dual relay system and half-duplex dual relay system) use the same transmission power at each node, the probability of security failure of the half-duplex relay system

Is expressed as [Equation 7] below.

[Equation 7]

과

는 하기의 [수학식 8]과 같다. here,

and

Is as shown in [Equation 8] below.

[Equation 8]

를 나타내고,

를 나타낸다. 또한, 중계 노드의 증폭 계수는

를 나타낸다.here,

And

Indicates. Also, the amplification factor of the relay node is

Indicates.

를 산출하면 하기의 [수학식 9]와 같다. Similarly, in the same way as a full-duplex relay system

Is calculated as in [Equation 9] below.

[Equation 9]

를 나타내고,

를 나타낸다. here,

And

Indicates.

Using the above-described [Equation 9], it is possible to obtain a distance that satisfies the target security failure probability around the relay node, and it can represent the security area as in the full-duplex relay mode.

을 만족하는 잔여 자기 간섭 세기 변수 a의 범위를 획득해야 한다. 이에 따라서, 본 발명은 자기 간섭 제거 기법이 정해짐에 따라 보안 실패 확률이 더 낮은 이중 중계 모드를 선택할 수 있다. Since the adaptive dual relay mode selection method according to an embodiment of the present invention is selected by comparing the probability of security failure of each dual relay system according to the variable a indicating the strength of residual self-interference,

The range of the residual self-interference intensity variable a that satisfies must be obtained. Accordingly, the present invention can select a dual relay mode having a lower probability of security failure as the self-interference cancellation technique is determined.

을 만족하는 잔여 자기 간섭 세기 변수 a의 범위는

인 경우와

인 경우로 구분되어 획득될 수 있다. 먼저 자기 간섭을 완전히 제거한 경우, 예를 들어

,

그리고

이 되므로, 항상

를 만족하게 된다. At this time,

The range of the residual self-interference intensity variable a satisfying

And if

It can be obtained by being classified as. If magnetic interference is first completely eliminated, for example

,

And

Because it is, always

Will be satisfied.

인 경우,

을 만족하는 a의 범위를 찾기 위해, 전술한 [수학식 6]을 이용하여

이 되는 a의 범위를 획득할 수 있다.For example,

If it is,

In order to find the range of a that satisfies, using Equation 6 above,

It is possible to obtain a range of a.

는 분모와 분자가 a의 3차 함수로 이루어져 있으므로, 하기의 [수학식 10]과 같이 나타낼 수 있다. At this time,

Since denominator and numerator consist of a third order function of a, it can be expressed as [Equation 10] below.

[Equation 10]

는 하기의 [수학식 11]과 같다. here,

Is as shown in [Equation 11] below.

[Equation 11]

는

에 대해 감소 함수이므로, [수학식 10]의 3차 방정식의 근을 획득하면, 0과 1사이에 최대 하나의

가 존재하며, 이때의 0부터

까지는

를 만족하는 a의 범위가 된다. In the above equation (11), K ₁ , K ₂ and K ₃ are negative numbers, and K ₄ represents a positive number. Accordingly,

The

Since it is a decreasing function for, if you obtain the root of the cubic equation of [Equation 10], at most one between 0 and 1

Exists, and from 0 at this time

by

It becomes the range of a satisfying a.

까지는 전이중 중계 시스템을 이용하는 것이 보안 실패 확률 측면에서 우위를 가진다. 만약 0과 1 사이에 근이 존재하지 않다면

를 만족하는 a가 존재하지 않는 것이므로, 항상

가 된다. 이로 인해, 잔여 자기 간섭에 상관없이 항상 전이중 중계 시스템을 이용하는 것이 보안 실패 확률 측면에서 우위를 가진다. Therefore, the residual magnetic interference intensity variable is from 0

Until now, using a full-duplex relay system has an advantage in terms of probability of security failure. If there is no root between 0 and 1

Since there is no a that satisfies

Becomes. For this reason, regardless of residual magnetic interference, always using a full-duplex relay system has an advantage in terms of probability of security failure.

인 경우,

을 만족하는 a의 범위를 찾기 위해서

을 만족하는 a의 범위를 획득할 수 있다. As another example,

If it is,

To find the range of a that satisfies

It is possible to obtain a range of a satisfying a.

는 전술한 [수학식 6] 및 [수학식 9]를 이용하면 하기의 [수학식 12]와 같이 a에 대한 3차 방정식으로 나타낼 수 있다.

Using [Equation 6] and [Equation 9] described above, can be expressed as a third order equation for a as shown in [Equation 12] below.

[Equation 12]

는 하기의 [수학식 13]과 같다.here,

Is as shown in [Equation 13] below.

[Equation 13]

는 Lambert-W 함수이므로, K₅는 양수를 나타낸다. K₆ 및 K₇은 음수인 반면에,

에서

를 항상 만족하므로, K₉는 양수를 나타낸다. here,

Is a Lambert-W function, so K ₅ represents a positive number. K ₆ and K ₇ are negative, while

in

Since K is always satisfied, K ₉ represents a positive number.

가 존재하며, 이때의

부터 1까지는

를 만족하는 a의 범위가 된다.Accordingly, using the Descartes' rule of signs, if the root of the cubic equation of [Equation 12] is obtained, at most one between 0 and 1

Exists, and at this time

1 to 1

It becomes the range of a satisfying a.

부터 1까지는 반이중 중계 시스템을 이용하는 것이 보안 실패 확률 측면에서 우위를 가진다. Therefore, the residual magnetic interference intensity variable

From 1 to 1, using a half-duplex relay system has an advantage in terms of probability of security failure.

의 조건에서 잔여 자기 간섭 신호 변수에 대한 보안 실패 확률을 그래프로 도시한 것이고, 도 6은 본 발명의 일 실시예에 따른

의 조건에서 잔여 자기 간섭 신호 변수에 대한 보안 실패 확률을 그래프로 도시한 것이다.5 is according to an embodiment of the present invention

Security failure probability for the residual self-interference signal variable under the condition of is shown graphically, Figure 6 is according to an embodiment of the present invention

The probability of security failure for the residual self-interference signal variable under the condition of is shown graphically.

과

의 조건을 나타내며,

는 전술한 [수학식 10] 및 [수학식 12]의 방정식을 통해 획득될 수 있다.5 and 6, respectively

and

Indicates the condition of

Can be obtained through the equations of [Equation 10] and [Equation 12] described above.

까지는 전이중 중계 모드(Full-Duplex Relay)를 선택하고,

부터 1까지는 반이중 중계 모드(Half-Duplex Relay)를 선택하는 것이 보안 실패 확률 측면에서 우위를 가지는 것임을 확인할 수 있다. 이에 따라서, 본 발명의 일 실시예에 따른 적응적 이중 중계 모드 선택 방법 및 시스템이 제안하는 이중 중계 모드 선택 방법을 사용하는 경우, 항상 보안 실패 확률 측면에서 우위를 가지는 중계 모드를 선택할 수 있다. 5 and 6, the residual self-interference variable a is from 0

Until, select the full-duplex relay mode (Full-Duplex Relay),

From 1 to 1, it can be confirmed that selecting the half-duplex relay mode (Half-Duplex Relay) has an advantage in terms of probability of security failure. Accordingly, in the case of using the adaptive dual relay mode selection method and the dual relay mode selection method proposed by the system according to an embodiment of the present invention, a relay mode having an advantage in terms of security failure probability can be always selected.

7 is a block diagram showing the detailed configuration of a relay selection system according to an embodiment of the present invention, and FIG. 8 is a block diagram showing the configuration of a processing unit according to an embodiment of the present invention.

7 and 8, a relay selection system according to an embodiment of the present invention selects an adaptive dual relay mode according to a probability of security failure in a security relay system using cooperative jamming.

To this end, the relay selection system 700 according to an embodiment of the present invention includes a processing unit 710, a comparison unit 720, and a selection unit 730.

The processing unit 710 performs cooperative jamming based on the receiving node. At this time, the processing unit 710 represents a step of performing a full-duplex relay mode or a half-duplex relay mode using cooperative jamming in a full-duplex relay system or a half-duplex relay system in which self-interference does not occur, as shown in FIG. 7 It may include components.

Referring to FIG. 8, the receiving unit 711 may receive a cooperative jamming signal from the receiving node and receive a confidential message from the transmitting node at the relay node. For example, the receiving node may transmit a cooperative jamming signal to the eavesdropper to prevent eavesdropping from the eavesdropper, as well as the relay node.

Thereafter, the transmitting unit 712 may amplify the cooperative jamming signal and the confidential message at the relay node and transmit the amplified message to the receiving node and the eavesdropper. For example, the relay node may simultaneously receive the confidential message of the transmitting node and the cooperative jamming signal of the receiving node, and then perform amplification and transmission.

The removal unit 713 may remove the cooperative jamming signal from the receiving node. Since the receiving node knows relevant information about the channel information, the cooperative jamming signal, and the transmission power information, it is possible to remove the cooperative jamming signal from the cooperative jamming signal and the confidential message received from the relay node. On the other hand, since the eavesdropper does not know the relevant information, the cooperative jamming signal among the cooperative jamming signal and the confidential message received from the relay node cannot be removed, thereby causing the signal-to-interference noise ratio of the confidential message that the eavesdropper intends to eavesdrop on. (Signal to Interference Plus Noise Ratio; SINR) can be lowered.

The comparator 720 may perform a security failure probability of a full-duplex relay mode and a half-duplex relay mode according to the residual self-interference generated by cooperative jamming. Probability).

The comparator 720 may acquire and compare the security failure probability in the full-duplex relay mode and the security failure probability in the half-duplex relay mode through [Equation 4] and [Equation 7] described above, and compare the residual magnetic interference The range of the intensity variable (a) can be obtained. Also, the comparator 720 may calculate a security area through the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode.

The selector 730 selects a dual relay mode of a full duplex relay mode or a half duplex relay mode among duplex communication methods according to the comparison result.

또는

인 조건에 따라 전이중 중계 모드에서의 보안 실패 확률 및 반이중 중계 모드에서의 보안 실패 확률 측면에서 우위를 가지는 중계 모드를 선택할 수 있다. 보다 구체적으로, 선택부(730)는 잔여 자기 간섭 변수의 범위에서, 잔여 자기 간섭 변수(a)가 0부터

까지인 경우 전이중 중계 모드를 선택하고, 잔여 자기 간섭 변수(a)가

부터 1까지인 경우 반이중 중계 모드를 선택하는 것을 특징으로 한다. For example, the selection unit 730 has a range of residual self-interference variables.

or

Depending on the phosphorus condition, a relay mode having an advantage in terms of the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode may be selected. More specifically, the selector 730 is in the range of the residual self-interference variable, the residual self-interference variable (a) from 0

If is, the full-duplex relay mode is selected, and the residual self-interference parameter (a) is

It is characterized by selecting the half-duplex relay mode in the case of from 1 to 1.

Although not illustrated in FIGS. 7 and 8, the apparatus of FIGS. 7 and 8 may include all of the operations for the relay selection method described in FIGS. 1 to 6 described above.

The device described above may be implemented with hardware components, software components, and/or combinations of hardware components and software components. For example, the devices and components described in the embodiments include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors (micro signal processors), microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose computers or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may perform an operating system (OS) and one or more software applications running on the operating system. In addition, the processing device may access, store, manipulate, process, and generate data in response to the execution of the software. For convenience of understanding, a processing device may be described as one being used, but a person having ordinary skill in the art, the processing device may include a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that may include. For example, the processing device may include a plurality of processors or a processor and a controller. In addition, other processing configurations, such as parallel processors, are possible.

The software may include a computer program, code, instruction, or a combination of one or more of these, and configure the processing device to operate as desired, or process 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 embodied in the transmitted signal wave. The software may be distributed on networked computer systems, and stored or executed in a distributed manner. Software and data may be stored in 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 on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and constructed for the embodiments or may be known and usable by 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, DVDs, and magnetic media such as floptical disks. -Hardware devices specifically 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 high-level language code that can be executed by a computer using an interpreter, etc., as well as machine language codes made by a compiler. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described by a limited embodiment and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques are performed in a different order than the described method, and/or the components of the described system, structure, device, circuit, etc. are combined or combined in a different form from the described method, or other components Alternatively, even if replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (14)

A relay selection method for selecting an adaptive dual relay mode between a receiving node and a relay node in a secure relay system using cooperative jamming,
Performing cooperative jamming based on the receiving node;
Comparing the Security Outage Probability of Full-Duplex Relay Mode and Half-Duplex Relay Mode according to the magnitude of the residual self-interference generated by the cooperative jamming step; And
Selecting a dual relay mode of the full-duplex relay mode or the half-duplex relay mode among duplex communication methods according to a comparison result
Relay selection method comprising a. According to claim 1,
The step of performing the cooperative jamming
And performing the full-duplex relay mode or the half-duplex relay mode using the cooperative jamming. According to claim 2,
The step of performing the cooperative jamming
Receiving, at the relay node, a cooperative jamming signal from the receiving node, and receiving a confidential message from the transmitting node;
Amplifying and transmitting the cooperative jamming signal and the confidential message at the relay node to the receiving node and the eavesdropper; And
Removing, at the receiving node, the cooperative jamming signal
Relay selection method comprising a. According to claim 3,
The step of removing the cooperative jamming signal is
In the receiving node that knows the channel information, the cooperative jamming signal and related information about the transmission power information, characterized in that for removing the cooperative jamming signal among the cooperative jamming signal and the confidential message received from the relay node, How to choose a relay. According to claim 4,
The eavesdropper
Since the related information is not known, it is impossible to remove the cooperative jamming signal from the cooperative jamming signal and the confidential message received from the relay node,
The step of removing the cooperative jamming signal is
A method of relay selection, characterized in that the signal-to-interference plus noise ratio (SINR) of the confidential message that the eavesdropper intends to eavesdrop is lowered. According to claim 1,
Comparing the probability of the security failure is
A security selection method is calculated through the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode, and a range of residual self-interference strength variables is obtained. The method of claim 6,
The step of selecting the dual relay mode is
Of the range of the residual self-interference variable

or

A relay selection method for selecting a relay mode having an advantage in terms of security failure probability in the full-duplex relay mode and security failure probability in the half-duplex relay mode according to conditions. The method of claim 7,
The step of selecting the dual relay mode is
In the range of the residual self-interference variable, when the residual self-interference variable (a) is from 0 to a*, the full-duplex relay mode is selected, and when the residual self-interference variable (a) is from a* to 1, A method of selecting a relay, characterized by selecting a half-duplex relay mode. A relay selection system for selecting an adaptive dual relay mode between a receiving node and a relay node in a secure relay system using cooperative jamming,
A processing unit for performing cooperative jamming based on the receiving node;
Comparing the Security Outage Probability of Full-Duplex Relay Mode and Half-Duplex Relay Mode according to the magnitude of the residual self-interference generated by the cooperative jamming Comparison unit; And
Selection unit for selecting the dual relay mode of the full-duplex relay mode or the half-duplex relay mode among duplex communication methods according to the comparison result
Relay selection system comprising a. The method of claim 9,
The processing unit
The relay selection system, characterized in that to perform the full-duplex relay mode or the half-duplex relay mode using the cooperative jamming. The method of claim 10,
The processing unit
A receiving unit receiving a cooperative jamming signal from the receiving node and receiving a confidential message from a transmitting node at the relay node;
A transmitting unit amplifying the cooperative jamming signal and the confidential message at the relay node and transmitting them to the receiving node and the eavesdropper; And
Remover removing the cooperative jamming signal from the receiving node
Relay selection system comprising a. The method of claim 11,
The removal unit
In the receiving node that knows the channel information, the cooperative jamming signal and related information of the transmission power information, characterized in that for removing the cooperative jamming signal among the cooperative jamming signal and the confidential message received from the relay node, the relay Selection system. The method of claim 9,
The comparison unit
A relay selection system, characterized in that a security region is calculated through the probability of security failure in the full-duplex relay mode and the probability of security failure in the half-duplex relay mode, and a range of residual self-interference strength variables is obtained. The method of claim 13,
The selector is
Of the range of the residual self-interference variable

or

Depending on conditions, in the range of the residual self-interference variable, when the residual self-interference variable (a) is from 0 to a*, the full-duplex relay mode is selected, and the residual self-interference variable (a) is from a* to 1 If it is, characterized in that for selecting the half-duplex relay mode, relay selection system.

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