CN114337977A - Anti-eavesdropping scheme based on half-duplex cooperative NOMA system - Google Patents
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Abstract
The invention aims at an anti-eavesdropping scheme based on a half-duplex cooperative NOMA system, belonging to the field of wireless mobile communication, and the method comprises the following steps: the base station sends a superposed signal of the relay user and the remote user to the relay user; a relay user receives a signal from a base station and adopts SIC for decoding; a relay user sends a new remote user superposition coding signal, the remote user and an eavesdropper receive the signal from the relay user, the remote user adopts a SIC decoding signal, and the eavesdropper adopts a PLC decoding receiving signal; obtaining the achievable rates of a legal user and an eavesdropper according to a Shannon formula to obtain the confidentiality rate of a remote user, and then obtaining a safety interruption probability closed expression of the remote user through numerical calculation; and deducing and obtaining the minimum anti-eavesdropping service quality requirement of the remote user according to the safety interruption probability. The scheme can effectively prevent the remote user from being intercepted.
Description
Technical Field
The invention belongs to the field of wireless mobile communication, and mainly aims at an application scene of a half-duplex cooperative NOMA system, wherein the application scene is mainly used for preventing a signal of a remote user from being intercepted, and particularly relates to a minimum service quality requirement for preventing the user from being intercepted by analyzing the safety interruption probability of the single-eavesdropper half-duplex cooperative NOMA system.
Background
In view of the rapid development of internet and internet of things services, the service demand of wireless communication is increasing. Non-orthogonal multiple access (NOMA) has been widely used in various fields as one of the promising key technologies in fifth generation wireless networks. Unlike the conventional Orthogonal Multiple Access (OMA) technology, only a single radio resource can be allocated to one user, for example, by frequency or time division. The NOMA technique allows multiple users to be served simultaneously with different powers in the same resource block (time/frequency/code). The receiving end eliminates the interference from other users by Serial Interference Cancellation (SIC) according to the power difference for decoding.
The cooperative transmission technology is an effective technology for resisting path loss, channel fading and shadowing effects, can form a virtual multiple-input multiple-output scheme, cooperatively processes data, and improves the communication reliability of users with poor channel conditions. In a cooperative communication system, a signal of a source node is forwarded by using a relay node, which is called cooperative diversity. The operation mode of the relay node can be divided into a full-duplex mode and a half-duplex mode. Physical layer security has attracted much attention in recent years as an attractive method for implementing secure communications due to the broadcast nature of wireless communications. Therefore, how to prevent the user signal from being intercepted is a main direction of research at present.
In summary, the problems of the prior art are as follows: although privacy analysis for cooperative NOMA systems is now a major research hotspot, there is currently less research on anti-eavesdropping schemes based on users in half-duplex cooperative NOMA systems.
The difficulty of solving the above problems is: a closed expression based on the safety interruption probability in the single-eavesdropper half-duplex cooperation NOMA system is obtained so as to deduce the service quality requirement when the interruption does not occur to the remote user and further prevent the signal of the remote user from being intercepted.
The significance of solving the problems is as follows: the method comprises the steps of obtaining a closed expression based on the interruption probability of a relay user in the half-duplex cooperative NOMA system and the safe interruption probability of a remote user, quantitatively knowing the safety performance of the half-duplex cooperative NOMA system based on a single eavesdropper, deducing the condition that the user is not interrupted, and further effectively preventing the signal of the remote user from being intercepted.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an anti-eavesdropping scheme based on a half-duplex cooperative NOMA system, which is used for preventing the signal leakage of a remote user and ensuring the information security of the remote user.
In a first aspect, the present application provides an anti-eavesdropping scheme based on a half-duplex cooperative NOMA system, where the method includes:
s1, a base station sends a superposition coding signal about a relay user and a remote user to the relay user;
s2, a relay user receives a signal from a base station and decodes the signal by adopting serial interference elimination SIC;
s3, the relay user sends a new remote user superposition coding signal;
s4, a far-end user and an eavesdropper receive signals from the relay user, the far-end user adopts SIC decoding signals, and the eavesdropper adopts parallel interference elimination PLC decoding receiving signals;
s5, obtaining the achievable rates of a legal user and an eavesdropper according to a Shannon formula;
s6, obtaining the secret rate of the remote user, and then obtaining a safety interruption probability closed expression of the remote user through numerical calculation;
and S7, deducing to obtain the minimum anti-eavesdropping service quality requirement of the remote user according to the safety interruption probability.
Further, the method further comprises:
an anti-eavesdropping scheme according to claim 1, wherein when the near-end user acts as a relay, it is assumed that the transmission power of the relay user is identical to the transmission power of the base station.
Further, the method comprises:
an anti-eavesdropping scheme according to claim 1, wherein there is no direct link between the remote user and the eavesdropper and the base station due to distance, obstructions or other real-life reasons.
Further, the method comprises:
a wiretapping prevention scheme according to claim 1, wherein said S2 comprises:
and S21, after the relay user receives the signal from the base station, according to different power distribution sizes, the signal of the farthest user needs to be decoded first, then the signal of the second far-end user needs to be decoded, and finally the signal of the relay user needs to be decoded.
And S22, obtaining the Signal to Interference plus Noise Ratio (SINR) when the relay user and the far-end user respectively decode the signals according to the decoding sequence.
Further, the method comprises:
an anti-eavesdropping scheme according to claim 1, wherein the relay user operates in half-duplex mode to decode the superposition coded signal of the new remote user.
Further, the method comprises:
an anti-eavesdropping scheme according to claim 1, wherein the channel bandwidth considered by S5 in calculating the achievable rate of the user is a unit bandwidth.
Further, the method comprises:
an anti-eavesdropping scheme according to claim 1, wherein for the relay user, only the relay user will not be interrupted when successfully decoding the signals of the remote user and the relay user at the same time, and the safe interruption probability of the remote user is S6 that the rates of the remote user are all less than the complement of the user quality of service requirement.
Further, the method comprises:
an anti-eavesdropping scheme according to claim 1, wherein the quality of service requirement at S7 when the remote user happens not to be interrupted is a minimum quality of service requirement required to prevent eavesdropping by the user.
Drawings
For the purpose of making the objects, aspects and advantages of the present invention more apparent, there is described in detail preferred embodiments of the present invention with reference to the accompanying drawings, wherein:
fig. 1 is a schematic view of a single-eavesdropper-based half-duplex cooperative NOMA system scenario provided by the implementation of the present invention.
FIG. 2 is a flow chart of a safety outage probability analysis provided by the implementation of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; it will be understood by those skilled in the art that certain known structures in the drawings and descriptions thereof may be omitted.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
The analysis of the probability of security interruption in the single-eavesdropper-based half-duplex cooperative NOMA system provided by the application is realized in the scenario of fig. 1. Wherein BS denotes a relay, UE1Indicating a central user, also a relay user, UE2Representing a second far-end user, UE3Representing the farthest end user and E the eavesdropper. h isrIndicating the channel parameters between the base station and the relay user,
respectively representing a central user and a UE2，UE3And eavesdroppers, and assuming that their channel gains all follow an exponential distribution.
The method for analyzing the safe interruption probability in the NOMA system based on the half-duplex cooperation of the single eavesdropper, which is provided by the embodiment of the invention, specifically comprises the following steps:
s1, a base station sends a superposition coding signal about a relay user and a remote user to the relay user, wherein the superposition signal sent by the base station can be expressed as:
wherein x1，x2，x3Signals, P, representing respectively relaying, secondary and furthest remote userssIs the transmit power of the base station.
S2, the relay user receives a signal from the base station and decodes the signal by adopting Serial Interference Cancellation (SIC), wherein the signal received by the relay user can be expressed as:
yr＝hrx+n1 (2)
then the relay user decodes the received signal by using SIC, and for the half-duplex working mode, the relay user decodes the farthest user signal, the second far-end user signal and the relay user in turn, and SINR when decoding the signal is respectively:
γ1＝a1|hr|2ρ (5)
wherein
Represents the Signal-to-Interference Ratio (SNR) of the base station.
S3, the relay user sends a new remote user superposition coding signal, and the superposition signal forwarded by the relay user is as follows:
wherein P isrFor relaying user's transmission power, and has Pr＝Ps，
Representing the SNR at the relay user.
And S4, the remote user and the eavesdropper receive signals from the relay user, the remote user adopts SIC decoding signals, and the eavesdropper adopts parallel interference elimination PLC to decode the received signals. Specifically, due to the broadcast nature of wireless transmissions, users in a cell receive signals forwarded from a central user, and naturally, remote users and eavesdropping receive signals from remote users. The signal received by the farthest user from the relay user is:
y3＝h1，3y+n3 (7)
the SINR for the farthest user to decode the farthest user signal is:
the secondary remote user receives the signal from the relay user as follows:
y2＝h1，2y+n2 (9)
the secondary far-end user adopts SIC decoding signal, the SINR of secondary far-end user decoding the most far-end user signal and secondary far-end user signal is respectively
γ2＝b1|h1,2|2ρ (11)
The signal received by the eavesdropper from the relay user is:
ye＝h1,ey+ne (12)
then the eavesdropper decodes the received signal through Parallel interference cancellation (PLC), and the SINR of the decoded far-end user signal at the eavesdropper is:
s5, obtaining the achievable rates of a legal user and an eavesdropper according to a Shannon formula, wherein for the eavesdropper, the rate can be expressed as
For the legal users, when the relay user works in the half-duplex mode, the achievable rates of the secondary far-end user and the farthest-end user are respectively:
s6, obtaining the secret rate of the remote user, and then obtaining a safety interruption probability closed expression of the remote user through numerical calculation, wherein the secret rate of the remote user is as follows:
wherein [ x ]]+Max { x,0 }. And then obtaining a closed expression of the interruption probability of the system through numerical calculation. Specifically, the outage probability of the relay user and the safety outage probability of the remote user.
First, calculating the interruption probability of the relay user, where the relay user cannot be interrupted only when successfully decoding the signal of the remote user and the signal of the relay user at the same time, and when the relay user operates in the half-duplex mode, the interruption probability of the relay user can be expressed as:
wherein
Indicating the quality of service requirement, lambda, of the userrDenotes the channel gain obedience parameter between the base station and the relay user as lambdarIs used as the index distribution of (1).
And secondly, calculating the safe interruption probability of the remote user, wherein the safe interruption probability of the remote user is the complement of the rate of the remote user being smaller than the service quality requirement of the user, and when the relay user works in a half-duplex mode, the safe interruption probability of the remote user can be specifically expressed as follows:
at present, the closed-form solution of the formula (1) is difficult to obtain, so that the situation of high signal-to-noise ratio is considered, when the SNR tends to be infinite,
this gives:
wherein
The probability of a security outage based on a single eavesdropper half-duplex cooperative NOMA system is:
and S7, deducing to obtain the minimum anti-eavesdropping service quality requirement of the remote user according to the safety interruption probability. Through the research on the data transmission process, the calculated safe interruption probability is found, so that when the remote user is not interrupted, the eavesdropper can not steal the signal of the remote user certainly, and the eavesdropper can obtain the data through calculation, when the service quality requirement of the remote user meets the following conditions,
the signal leakage of the remote user can be effectively prevented.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. An anti-eavesdropping scheme based on a half-duplex cooperative NOMA system is characterized in that the anti-eavesdropping scheme based on a single-eavesdropper half-duplex cooperative NOMA system comprises the following steps:
s1, a base station sends a superposition coding signal about a relay user and a remote user to the relay user;
s2, a relay user receives a signal from a base station and decodes the signal by using SIC;
s3, the relay user sends a new remote user superposition coding signal;
s4, a remote user and an eavesdropper receive signals from the relay user, the remote user adopts SIC decoding signals, and the eavesdropper adopts PLC decoding receiving signals;
s5, obtaining the achievable rates of a legal user and an eavesdropper according to a Shannon formula;
s6, obtaining the secret rate of the remote user, and then obtaining a safety interruption probability closed expression of the remote user through numerical calculation;
and S7, deducing to obtain the minimum anti-eavesdropping service quality requirement of the remote user according to the safety interruption probability.
2. An anti-eavesdropping scheme according to claim 1, wherein when the near-end user acts as a relay, it is assumed that the transmission power of the relay user is identical to the transmission power of the base station.
3. An anti-eavesdropping scheme according to claim 1, wherein there is no direct link between the remote user and the eavesdropper and the base station due to distance, obstructions or other real-life reasons.
4. A wiretapping prevention scheme according to claim 1, wherein said S2 comprises:
s21, after the relay user receives the signal from the base station, according to the different power distribution, it needs to decode the signal of the farthest end user first, then decode the signal of the second end user, and finally decode the signal itself;
and S22, obtaining SINR when the relay user and the remote user respectively decode the signals according to the decoding sequence.
5. An anti-eavesdropping scheme according to claim 1, wherein the relay user operates in half-duplex mode to decode the superposition coded signal of the new remote user.
6. An anti-eavesdropping scheme according to claim 1, wherein the channel bandwidth considered by S5 in calculating the achievable rate of the user is a unit bandwidth.
7. An anti-eavesdropping scheme according to claim 1, wherein for the relay user, only the relay user will not be interrupted when successfully decoding the signals of the remote user and the relay user at the same time, and the safe interruption probability of the remote user is S6 that the rates of the remote user are all less than the complement of the user quality of service requirement.
8. An anti-eavesdropping scheme according to claim 1, wherein the quality of service requirement at S7 when the remote user happens not to be interrupted is a minimum quality of service requirement required to prevent eavesdropping by the user.
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