Physical layer secret communication method based on modulation symbol phase rotation

Abstract

A physical layer secret communication method based on modulation symbol phase rotation is provided; a rectangular MQAM symbol is formed by stacking P mutually independent 4QAM symbols; the P 4QAM symbols phases are rotated in random, thus safely transmitting data between users; the method comprises the following steps: legal users use channel state information, and use a channel reciprocity theorem and a negotiation mechanism to determine the seed number of a chaotic sequencer used for generating a random number; the method periodically updates the seed number, resets the chaotic sequencer so as to generate a new chaotic sequence, and uses an interleaver to process the generated chaotic sequence set, thus obtaining approximately independent P groups of uniform distributed random sequences. The channel reciprocity and negotiation mechanism can ensure the dual-party phase rotation consistency, and the channel randomness can ensure a wiretapper cannot obtain a random rotation phase consistent with a sending terminal. The method allows legal users to safely transmit data under static state or quasi-state channel environments with high safety.

Description

technical field [0001] The invention relates to the technical field of wireless communication and information security, in particular to a physical layer security communication method based on modulation symbol phase rotation. Background technique [0002] Physical layer security, as a theoretically proven secure communication solution, has attracted extensive attention from researchers in recent years. The mainstream physical layer security technologies can be divided into two categories according to whether keys are used or not. [0003] In the keyless physical layer security technology, the secrecy capacity is defined as the difference between the channel capacity of the legitimate channel (the channel between legitimate users) and the channel capacity of the wiretapping channel (the channel between the sender and illegal users). When the confidentiality capacity is greater than 0, the transmission between legitimate users can be absolutely secure; when the confidentialit...

AI Technical Summary

Problems solved by technology

However, this type of method is not suitable for all communication occasions. For example, when the channel of a legal user is a static channel or a quasi-static channel, the key entropy for generating the key is too low, and the security of information transmission is also greatly reduced.

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