A physical layer watermark authentication method and system for LTE system

Abstract

The invention discloses an LTE system-oriented physical layer watermark authentication method and system, belonging to the field of physical layer watermark authentication. The invention applies the physical layer authentication technology to the LTE system, reduces the system overhead required by the traditional high-level authentication, and makes the following improvements to the traditional watermark authentication scheme: the invention proposes to embed the watermark in the phase of the reference signal, reducing The small watermark causes interference to the user signal, and at the same time, by adopting the method of phase symmetry embedding, the influence of the watermark on the channel estimation of the reference signal is reduced; the present invention proposes the concept of pseudo-user bits, and uses pseudo-user bits instead of user bits as the generated watermark parameters to reduce the authentication error caused by the demodulation error of the user signal at the receiving end; the present invention also adds channel coding into the watermark generation scheme to reduce the bit error that occurs during the transmission of the watermark.

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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