A privacy protection method for downlink cooperative physical layer of multi-user relay network

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, etc. Achieve the effect of avoiding the impact of detection performance, improving system security, and deteriorating the received signal-to-interference-noise ratio

Active Publication Date: 2018-04-17
XI AN JIAOTONG UNIV
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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

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  • A privacy protection method for downlink cooperative physical layer of multi-user relay network
  • A privacy protection method for downlink cooperative physical layer of multi-user relay network
  • A privacy protection method for downlink cooperative physical layer of multi-user relay network

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Embodiment Construction

[0031] The present invention is described in further detail below in conjunction with accompanying drawing:

[0032] refer to figure 1 , the multi-user relay network in the multi-user relay network downlink cooperative physical layer privacy protection method according to 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 transmission power of all user nodes is P, and 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 legal user nodes and cooperating user nodes Source node S and legitimate user nodes Send the information symbol x to the relay node R respectively S and noise signal Simultaneous Collaboration User Nodes Send artificial n...

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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 privacy protection method of a multi-user relay network downlink cooperative physical layer. Background technique [0002] Multi-user relay systems widely exist 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, unscheduled users appear as potential eavesdroppers, bringing security risks. In response to such problems, in the past, cryptographic encryption technology was mostly used to assign different secret keys to each user, relying on the high deciphering complexity of the secret key to ensure the privacy of legitimate user information. However, with the rapid development of high-performance computers, this encryption technology, which relies on computational security, is increasingly challenged. P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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