Physical layer watermark authentication method and system for LTE system

Abstract

The invention discloses a physical layer watermark authentication method and system for an LTE system, and belongs to the field of physical layer watermark authentication. A physical layer authentication technology is applied to an LTE system, system overhead required by traditional high-level authentication is reduced, and a traditional watermark authentication scheme is improved as follows: a watermark is embedded into a phase of a reference signal, interference of the watermark to a user signal is reduced, and meanwhile, by adopting a phase symmetric embedding mode, the influence of the watermark on the channel estimation of the reference signal is reduced; according to the method, the concept of pseudo user bits is provided, the pseudo user bits are used for replacing user bits to serve as parameters for watermark generation, and authentication errors caused by user signal demodulation errors of a receiving end are reduced; in addition, channel codes are added into a watermark generation scheme, and error codes generated in the watermark transmission process are reduced.

Description

technical field [0001] The invention belongs to the field of physical layer watermark authentication, and more specifically relates to a physical layer watermark authentication method and system for an LTE system. Background technique [0002] In recent years, the research on physical layer security mechanism has become the focus of people's attention. As an important way to realize the physical layer security mechanism, the physical layer authentication technology has strong theoretical and practical significance. The physical layer watermarking technology embeds the authentication information in the transmission signal in the form of watermark, which is the most commonly used physical layer authentication technology. [0003] In the communication system, the watermark scheme is firstly generated by the transmitter and embedded in the transmitted signal, then the receiver extracts the watermark in the transmitted signal, and generates a watermark at the receiving end, and ...

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Problems solved by technology

[0004] The existing physical layer watermarking schemes are all based on a specific modulation method (such as QPSK, FSK, OFDM, etc.), and the watermark information is embedded in specific parameters (such as carrier frequency, phase, etc.), but usually do not consider the watermark Practical Application Scenarios of the Solution

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