An Unconditional Physical Layer Security Cooperative Transmission Method Based on Interference Alignment Technology

Abstract

The invention proposes an unconditional physical layer security cooperative transmission method based on interference alignment technology. The present invention first forms a network and performs time-frequency synchronization, and selects the main control terminal; all transmitting terminals sequentially send channel training signals; the receiving terminal performs channel state estimation and transmits it to the main control terminal; the main control terminal calculates the precoding matrix and the interference suppression matrix , and then transmitted to other transmitting terminals and receiving terminals; each transmitting terminal performs binary security encoding on the original service flow, and the coded bit stream is used as the service input for interference-aligned transmission; the receiving terminal performs security decoding on the received binary stream to obtain user information flow. Compared with the traditional key-based encryption and decryption transmission scheme, the present invention firstly avoids the risks brought by exchanging keys, and secondly, because it can theoretically realize that the bit error rate of illegal users is close to 0.5, it can realize information theory that cannot Obtain valid information with low complexity.

Description

technical field [0001] The present invention relates to an information security guarantee method in the technical field of wireless communication, in particular to an unconditional physical layer security cooperative transmission method based on interference alignment technology. Background technique [0002] The open, broadcast nature of wireless communication makes secret calls and transmitted information vulnerable to interception and interception. The existing security mechanisms are all based on computing security, which relies on the assumption of limited computing resources and time of the attacker. With the rapid development of high-speed computers, parallel computing and other technologies, if the key is leaked or used by the attacker If the high-performance computing cluster is cracked, the entire security system will completely collapse. Therefore, finding a high-strength encrypted transmission method is an important task to improve the confidentiality of calls a...

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However, Shannon and Wyner only gave the theory, did not give a specific implementation method

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