Method for establishing unconditionally secure communication model based on combination of beam forming and security coding

Abstract

The invention discloses a method for establishing an unconditionally secure communication model based on combination of beam forming and security coding. The method comprises the steps that a legal sending user sends pre-coded and modulated signals, and an eavesdropping user receives the signals and calculates an eavesdropping bit error rate; security coding parameters are calculated, a legal receiving user sends a pilot frequency sequence, the legal sending user estimates a legal channel, information of the legal channel is extracted, SVD pre-coding is carried out on the signals subjected to security coding and modulation, and the signals are sent; the legal receiving user or the eavesdropping user receives the signals and carries out decoding processing and carries out judgment and demodulation on the decoded signals, security decoding is carried out on a demodulated binary bit stream, and transmitted signals or eavesdropped signals are acquired. The eavesdropping user lacks information of the legal channel, so that pre-coding processing of the received signals cannot be relieved, and the bit error rate is high. The method disclosed by the invention can well achieve establishment of an advantageous channel in an eavesdropping signal model, and ensure the legal user to receive signals under a low bit error rate.

Description

technical field [0001] The invention belongs to the field of information technology safety, in particular to a method for establishing an unconditional safety communication model based on the combination of beamforming and safety coding. Background technique [0002] Due to the broadcast characteristics of wireless communication, the wireless network lacks physical boundaries, and wireless communication without physical connection is open to outside eavesdroppers. Solving the security of wireless communication at the physical layer has become a necessary problem at the physical layer. The physical layer security technology is based on Shannon [1] The security model of , which is a theoretical model to solve the boundary, validity and reliability of wireless communication. [0003] In 1975, the eavesdropping channel model proposed by Wyner of Bell Labs combined the security technology of communication and the reliable technology of communication for the first time, such as ...

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Problems solved by technology

But Wyner ] etc. have not given the method of how to realize the eavesdropping channel is worse than the legal channel, that is, they have not given the realization method of the eavesdropping channel model establishment, and have not given the encoding and decoding method of "safe coding". The research results of Wyner et al. have not received enough attention and further development.

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