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Physical layer security transmission method for resisting sniffing of unreliable relay nodes

A technology of physical layer security and relay node, applied in the field of physical layer security of wireless relay system

Inactive Publication Date: 2014-04-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the relay node itself is unreliable, the relay forwards and eavesdrops on the source node information at the same time. At present, there is no literature on the physical layer security transmission technology of the unreliable relay system from the perspective of the system bit error rate. and discuss

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  • Physical layer security transmission method for resisting sniffing of unreliable relay nodes
  • Physical layer security transmission method for resisting sniffing of unreliable relay nodes
  • Physical layer security transmission method for resisting sniffing of unreliable relay nodes

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] see figure 1 , 2 As shown, the present invention provides a physical layer security transmission method against unreliable relay node eavesdropping, consider a network including N unreliable relay nodes, there is no cooperation between relay nodes, and the source node has K antennas , and the rest of the nodes are single-antenna. There is no direct path between the source node and the destination node, and the unreliable relay node, as a part of the network, assists the source node to forward information to the destination node. However, during the forwarding process, the relay node also tries to decode the received signal, hoping to obtain the source node information. The entire information transmission process follows the following steps:

[0041] 1) Before the data is transmitted, the source node and the destination node send training sequences to each ...

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Abstract

The invention discloses a physical layer security transmission method for resisting sniffing of unreliable relay nodes. The amplify-and-forward protocol is adopted by the method. The method comprises the following steps: firstly, estimating equivalent channels of all links between a source node and a destination node by the source node and the destination node, then, selectively combining a physical channel of a source node-relay node-destination node link and a random antenna at the source node, and designing random phase rotation for each transmitted symbol. As the relay nodes are independent and do not cooperate with each other, only the own local channel information can be known by each relay node; by utilizing the asymmetry of the existing channel information of the destination node and the relay nodes, the destination node is capable of smoothly decoding the information transmitted by the source node, and the relay nodes are incapable of performing correct coding due to the influence of random disturbance, and therefore the goal that the unreliable relay nodes are prevented from sniffing is achieved.

Description

Technical field: [0001] The invention relates to the technical field of physical layer security of a wireless relay system, in particular to a physical layer security transmission method that resists eavesdropping by unreliable relay nodes. Background technique: [0002] Wireless relay technology is a new technology that utilizes geographically dispersed wireless nodes to achieve space diversity. In order to solve the limitations of the size and power of wireless terminals, wireless relay technology utilizes the broadcast characteristics of wireless channels and the cooperation of idle nodes in the network to form a virtual multi-antenna system to obtain space diversity gain. Industry and mobile communication operators have also placed high expectations on wireless relay technology. In the LTE-A design, 3GPP working groups have submitted proposals to use relay stations in cells to extend coverage and capacity. Recently, in the Internet of Things and triple play projects th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W12/00H04W16/26H04L1/00H04W12/122
Inventor 高贞贞张超
Owner XI AN JIAOTONG UNIV
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