Wireless anti-eavesdropping communication method based on cooperation of multiple source nodes

Abstract

The invention discloses a wireless anti-eavesdropping communication method based on cooperation of multiple source nodes. The method includes the steps that data interaction is conducted on all the source modes in a Bluetooth mode, so that all the source nodes synchronously transmit the same data information to a target node; according to main channel state information, all the source nodes conduct precoding on the data information to be transmitted; all the source nodes synchronously transmit respective precoded information to the target node, then the target node and an eavesdropping node calculate capacity of the main channel and capacity of an eavesdropping channel respectively, and safety capacity and eavesdropping probability of wireless channel transmission are obtained further. In the mode of cooperation and precoding of the source nodes, the safety capacity of wireless transmission is remarkably improved, and the eavesdropping probability of wireless transmission is effectively reduced, which is beneficial for solving the safety problem caused by multiple eavesdropping nodes existing in an actual wireless communication scene.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to an algorithm adopted when resisting eavesdropping. Background technique [0002] With the development of wireless communication technology, users put forward higher requirements for security performance. Traditional encryption methods are usually applied at the network layer and above, and these encryption methods are based on a huge amount of calculation. However, with the rapid improvement of computer computing power, traditional encryption methods cannot guarantee the absolute security of information transmission, which has inspired a large number of researchers to seek to use physical layer channel characteristics to encrypt data information. The physical layer is the lowest layer in the OSI (OpenSystem Interconnection) model, and its security is the basis of the entire system security. Subsequently, Wyner proved that under the condition that the security cap...

AI Technical Summary

Problems solved by technology

In this way, relying on only one best user to fight against eavesdropping cannot improve the security performance very well

Secondly, although the method of using artificial noise at the transmitting end will reduce the quality of the eavesdropping channel, if the transmitting power is constant, the power of sending useful signals will also be reduced, and the quality of the main channel will also be reduced, so it is difficult to ensure the improvement of security capacity

In addition, if the transmit power is increased, additional power will be wasted

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