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Cooperative physical layer privacy protection method of multi-user relay network downlink

A relay network and downlink technology, which is applied in the field of physical layer privacy protection of multi-user relay network downlink cooperation, can solve the problems of inability to guarantee the privacy of information received by legitimate users, and relying on the security of inter-user channel information.

Active Publication Date: 2016-11-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there are also problems with this scheme. The security it guarantees depends heavily on the security of channel information between users. In some cases, when an eavesdropper learns the channel information between users, this scheme cannot guarantee the privacy of information received by legitimate users. sex

Method used

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  • Cooperative physical layer privacy protection method of multi-user relay network downlink
  • Cooperative physical layer privacy protection method of multi-user relay network downlink
  • Cooperative physical layer privacy protection method of multi-user relay network downlink

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0032] reference figure 1 , The multi-user relay network in the method for protecting the privacy of the downlink cooperative physical layer of the multi-user relay network of the present invention includes a source node S, a relay node R, and N user nodes U j , Where j=1,...,N, there is no direct link between the source node S and each user node, and the receiver additive noise at the i-th user node is n i , The noise power is N 0 , The transmit power of all user nodes is P, the multi-user relay network works in time division duplex mode, and the information transmission in each scheduling unit includes the following steps:

[0033] 1) Select legitimate user nodes And collaborative user nodes Source node S and legal user node Send the information symbol x to the relay node R respectively S And noise signal Simultaneous collaboration user nodes Send artificial...

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Abstract

The invention discloses a cooperative physical layer privacy protection method of a multi-user relay network downlink. The method comprises the following steps that a legal user node Um and a cooperative user node Uk are selected, a source node S and the legal user node Um send an information symbol xs and an industrial noise signal Wm to a relay node R respectively, and meanwhile the cooperative user node Uk sends an artificial noise signal Wk(1) to the relay node R; 2, the relay node receives a mixed signal yR sent by the legal user node Um, the cooperative user node Uk and the source node S, the mixed signal yR is amplified and then transmitted to all user nodes, and meanwhile the cooperative user node Uk sends an artificial noise signal Wk(2); and 3, the legal user node eliminates self-interference according to the received signal to acquire a sufficient statistic ym(rem) used for detecting the symbol, and then the information symbol xs is estimated according to the sufficient statistic ym(rem) used for detecting the symbol. According to the method, the information transmission security of the multi-user relay network downlink can be ensured.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for protecting the privacy of a physical layer of a multi-user relay network downlink coordination. Background technique [0002] Multi-user relay systems are widely used in LTE-A and 5G networks. However, due to the openness of wireless media, multi-user relay systems are vulnerable to eavesdroppers. Signals sent to legitimate users can also be received by other users. At this time, the unscheduled users behave as potential eavesdroppers, bringing security risks. In response to such problems, in the past, most of the cryptographic encryption technology was used to assign different secret keys to each user, and the high decryption complexity of the secret key was used to ensure the privacy of legitimate user information. However, with the rapid development of high-performance computers, this kind of encryption technology, which relies on computational security, ...

Claims

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Application Information

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IPC IPC(8): H04W12/02H04K3/00
CPCH04K3/43H04K3/62H04W12/02
Inventor 孙黎徐洪斌任品毅杜清河
Owner XI AN JIAOTONG UNIV
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