Safe transmission method of physical layer in wireless communication

Abstract

The invention discloses a safe transmission method of a physical layer in wireless communication, which is characterized by comprising the following steps of: a single-antenna desired user firstly transmits unencrypted request information to a multi-antenna base station; the base station receives the request information and estimates a signal path between the base station and the desired user with a frequency piloting sequence; the base station modulates bit to be transmitted into a constellation point symbol b (n) with a known phase position modulating mode, designs a fast-variable weighting coefficient, weights the constellation point symbol b (n) to be transmitted, and transmits the weighted symbol on selected Jrand antennas according appointed gross power; the desired user receives the weighted symbol, i.e. a weighting symbol, and decodes with a maximum likelihood method; and a wiretap user fast changes the weighting coefficient due to the process of the base station, can not decode with a blind equalization method, and can not decode with the maximum likelihood method, so that the method finally realizes the safe transmission.

Description

technical field [0001] The invention relates to a wireless communication system, in particular to a physical layer security transmission method in the wireless communication system. Background technique [0002] In recent years, various wireless communication technologies have emerged in an endless stream. The emergence of these technologies enables terminals such as computers and mobile phones to have mobile access capabilities, solves the connection constraints of traditional wired access, and provides users with various efficient and high-speed access plan. With the continuous improvement of the data transmission rate supported by the wireless communication system and the continuous expansion of the wireless user scale, it has become an inevitable trend of communication development that the wireless communication system gradually replaces the traditional wired communication system in many aspects. At the same time, with the wide popularization of wireless communication i...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the power utilization rate is too low due to the design of the above random weighting coefficients, and proposes a wireless physical layer security transmission method for randomly selecting transmitting antennas. This method makes the signals sent by the base station always superimpose in phase at the desired user to obtain the highest The transmission gain is very high, and the power utilization rate is very high; for eavesdropping users, the information cannot be effectively demodulated, so as to achieve the purpose of secure communication

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