A physical layer safety method based on artificial noise power distribution

A physical layer security and artificial noise technology, applied in power management, communication interference, electrical components, etc., can solve the problems of high probability of confidentiality interruption and poor confidentiality, and achieve low probability of confidentiality interruption, enhanced security features, and improved confidentiality sexual effect

Active Publication Date: 2019-06-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a physical layer security method based on artificial noise power distribution in order to solve the problems of high confidentiality interruption probability and poor confidentiality in the existing broadcasting system

Method used

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  • A physical layer safety method based on artificial noise power distribution
  • A physical layer safety method based on artificial noise power distribution
  • A physical layer safety method based on artificial noise power distribution

Examples

Experimental program
Comparison scheme
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specific Embodiment approach 1

[0029] Specific implementation mode one: the specific process of a physical layer security method based on artificial noise power allocation in this implementation mode is as follows:

[0030] Step 1. Assume that there is a legal transmitter Alice, K legal receivers (Bob1, Bob2, ... BobK), and an eavesdropper Eve; the schematic diagram of the wireless broadcast communication system model is as follows figure 1 shown.

[0031] The number of antennas of Alice at the transmitting end is N t , the number of antennas for each legal receiver is N r , the number of eavesdropper antennas is N e ;

[0032] Assuming that the total transmit power constraint of the transmitter Alice is limited to P, where the power of the artificial noise signal transmitted by the transmitter Alice is αP, and the power of the useful signal is (1-α)P, then the transmitter Alice (the source with multiple antennas ) The transmitted signal x is expressed as

[0033]

[0034] where x s is a useful si...

specific Embodiment approach 2

[0040] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in the step 2, it is assumed that the receiving antenna gain of the eavesdropping end Eve and each legal receiver Bob are the same, and the calculation signal x passes through the wireless broadcast between Alice and Bob Legal channel transmission, the received signal reaching the kth legitimate receiver Bob, and the signal x is transmitted through the wiretapping channel between Alice and Eve, and the received signal reaches the eavesdropper Eve; the specific process is:

[0041] The signal x is transmitted through the wireless broadcast legal channel between Alice and Bob, and the received signal reaching the kth legal receiver Bob is expressed as:

[0042]

[0043] The signal x is transmitted through the eavesdropping channel between Alice and Eve, and the received signal reaching the eavesdropper Eve is expressed as:

[0044]

[0045] in, Represents the channel ma...

specific Embodiment approach 3

[0048] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the H b,k and H e Each element in represents the channel complex gain when the signal is transmitted, H b,k Each element in satisfies the mean value of 0 and the variance of cyclic complex Gaussian distribution; H e Each element in satisfies the mean value of 0 and the variance of cyclic complex Gaussian distribution; n b,k Each element in has a mean of 0 and a variance of complex Gaussian vector of n e Each element in has a mean of 0 and a variance of complex Gaussian vector;

[0049] variance It is the system measurement value, indicating the variance of the Gaussian noise in the environment. If it is a simulation, this value is defined by itself. The variance It is the system measurement value, indicating the variance of the Gaussian noise in the environment. If it is a simulation, this value is defined by itself;

[0050] Assuming that the leg...

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Abstract

The invention discloses a physical layer safety method based on artificial noise power distribution, and relates to a physical layer safety method. The objective of the invention is to solve the problems of high confidentiality interruption probability and poor confidentiality in an existing broadcasting system. The method comprises the following steps: 1, transmitting a signal by a transmitting end; 2, calculating a received signal reaching the kth legal receiver end and a received signal reaching the eavesdropper end; 3, calculating the signal to interference plus noise ratio of the kth legal receiver and the signal to interference plus noise ratio of the eavesdropper; 4, calculating the instantaneous confidentiality capacity of the kth legal receiver; 5, calculating an optimal artificial noise power distribution factor; and 6, calculating the confidentiality interruption probability according to different artificial noise power factors, and drawing a change curve of the confidentiality interruption probability along with the artificial noise power distribution factor to obtain the artificial noise power distribution factor meeting the requirements. The invention is applied to the field of physical layer security of a wireless broadcast communication system.

Description

technical field [0001] The present invention relates to physical layer security methods. Background technique [0002] The rapid development of wireless communication has attracted great attention in recent years. Wireless multicast transmission is also an important application in wireless communication. It can be regarded as a form of cluster communication and has rich application scenarios, such as conference calls, military orders Notifications, remote teaching, etc. Different from the multi-user system, it only transmits single-code stream data to multiple receiving nodes through the sending node, and the data received by each node is the same. The wireless transmission environment has different characteristics from the wired transmission. It transmits in free space via electromagnetic waves. The transmitted electromagnetic wave signals are not confidential and can be received by any terminal in the space. For the broadcast system, because it is also in the wireless tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04K1/00H04K3/00H04W52/24
Inventor 韩帅高辞源李志强孟维晓
Owner HARBIN INST OF TECH
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