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An anti-eavesdropping coding method based on physical layer

An encoding method and anti-eavesdropping technology, applied in the field of anti-eavesdropping encoding based on the physical layer, can solve problems such as vulnerability to attack, difficulty in implementing high-level encryption, difficulty in key distribution and management, etc.

Inactive Publication Date: 2016-12-21
XI AN JIAOTONG UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

In order to prevent wirelessly transmitted information from being eavesdropped by unauthorized eavesdroppers, high-level encryption algorithms are often used in wireless networks. The distribution and management of keys in high-level encryption algorithms are difficult and vulnerable to attacks
In a network without infrastructure, such as an Ad Hoc network, it is difficult to implement high-level encryption

Method used

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  • An anti-eavesdropping coding method based on physical layer
  • An anti-eavesdropping coding method based on physical layer
  • An anti-eavesdropping coding method based on physical layer

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Embodiment Construction

[0027] The anti-tapping coding method based on the physical layer of the present invention is: adding an anti-tapping coding matrix W in the cooperative communication system i , so that the signal at the receiving end is randomized; the anti-eavesdropping coding matrix W i is decomposed into static and dynamic parts, the anti-eavesdropping coding matrix W i It is generated according to the channel state information and the current information to be sent. Specifically follow the steps below:

[0028] 1) At the beginning of each coherence time, multiple user nodes of cooperative transmission send pilot signals to the destination node through time division multiplexing, and the destination node estimates the channel state information from each node to it, and then, the destination node Send pilots to all user nodes on the frequency, and the user nodes use the pilots to estimate the channel state information from the node to the destination node;

[0029] 2) The user nodes shar...

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Abstract

The invention discloses an anti-eavesdrop coding method based on a physical layer. The anti-eavesdrop coding method based on the physical layer is characterized in that an anti-eavesdrop coding matrix Wi is added in a cooperative communication system, so that signals at a receiving end are randomized; the anti-eavesdrop coding matrix Wi is disintegrated into a static part and a dynamic part, and is generated according to channel state information and information to be transmitted currently. By the method, a low eavesdropping probability is regarded as a standard, after added with the anti-eavesdrop matrix, the original cooperative communication system is transformed into a communication system with a physical layer confidential effect, so that even using blind channel estimation, an eavesdropping end cannot eavesdrop the information of a transmitting end.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a secret coding method, which is a physical layer-based anti-eavesdropping coding method, and the method is suitable for secret coding of a cooperative communication system. Background technique [0002] Due to the broadcast characteristics of wireless communication, wireless transmission can be eavesdropped by any node within the transmission range, so the confidentiality of wireless transmission is a major problem faced by wireless communication. In order to prevent wirelessly transmitted information from being eavesdropped by unauthorized eavesdroppers, high-level encryption algorithms are often used in wireless networks. The distribution and management of keys in high-level encryption algorithms are difficult and vulnerable to attacks. In a network without infrastructure, such as an Ad Hoc network, it is difficult to implement high-level encryption. [0003] Rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L5/00H04K1/00
Inventor 廖学文李祥高贞贞朱世华吕刚明常培梁
Owner XI AN JIAOTONG UNIV
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