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A communication method based on 16qam partial position embedding signal watermark

A communication method and technology for watermarking information, applied in secure communication devices, countermeasures against encryption mechanisms, digital transmission systems, etc. The effect of stealth enhancement

Active Publication Date: 2021-11-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional physical layer signal watermark is usually superimposed on the entire carrier information, which reduces the concealment of the carrier information

Method used

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  • A communication method based on 16qam partial position embedding signal watermark
  • A communication method based on 16qam partial position embedding signal watermark
  • A communication method based on 16qam partial position embedding signal watermark

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Embodiment Construction

[0030] First, the terms used in the present invention are explained:

[0031] 16QAM: A quadrature amplitude modulation method including 16 symbols, which is a digital modulation method. The 16 symbols correspond to (3,3), (1,1), (3,1), (1,3), (-3,-3), (-1,-1), (- 3,-1), (-1,-3), (-3,3), (-1,1), (-3,1), (-1,3), (3,-3), ( 1, -1), (3, -1), (1, -3) 16 points, among which the 4 positions of ±3±3j are the 4 points with the farthest European distance in the 16QAM constellation diagram.

[0032] Spread spectrum watermark: The spread spectrum system has strong anti-interference ability, low probability of interception and high confidentiality. The original watermark information can be spread-spectrum modulated by a broadband pseudo-random noise sequence generator, and then it can be embedded into the carrier information as the watermark signal to be embedded after modulation. For the present invention, the length of the signal watermark is the length of the spread spectrum signal, a...

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Abstract

The present invention provides a communication method based on 16QAM partial position embedding signal watermark, which distinguishes the information to be sent, uses the public information as the carrier information, and uses the confidential information as the watermark information; on the one hand, the carrier information is modulated by 16QAM. Carrier information; on the other hand, the watermark information is spread into a signal watermark, and the signal watermark is embedded in the 4 positions of ±3±3j of the 16QAM constellation diagram of the modulated carrier information with low power. Embedding the signal watermark in a specified part of the position greatly reduces the influence of the signal watermark on the carrier information under the premise of ensuring low power embedding. Compared with the existing scheme of embedding signal watermarks in all positions, it not only ensures the transmission of watermark information, but also greatly reduces the bit error rate of carrier information, so that the concealment of the entire communication process is improved.

Description

technical field [0001] The invention belongs to communication physical layer security technology, and relates to 16QAM (Quadrature Amplitude Modulation) modulation technology and signal watermark technology. Background technique [0002] In recent years, physical layer signal watermarking has been widely used in physical layer identity authentication. Through certain watermark embedding and extraction algorithms, the receiving end can achieve a high watermark authentication rate under low signal-to-noise ratio. [0003] For the purpose of improving the security of the physical layer, signal watermarking is proposed as a new type of physical layer technology. Physical layer signal watermarking is a mechanism for simultaneously transmitting secret security authentication codes or labels with signals. At the receiving end, the identity of the communication user can be identified by extracting the special authentication watermark. Therefore, the study of physical layer signal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04L27/34
CPCH04L9/002H04L27/3416H04L2209/608
Inventor 郭瑞林雷霞刘东林陈建功
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA