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Method and system for embedding and extracting radio frequency watermark based on qpsk signal modulation

A technology of watermark embedding and signal modulation, applied in phase modulation carrier system, transmission system, secure communication, etc., can solve problems such as inability to apply physical signals and insufficient digital watermark concealment methods.

Active Publication Date: 2018-11-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Traditional digital watermarks mainly use multimedia, documents, software and other signals as information carriers, which cannot be applied to lower-level physical signals, and the digital watermark hiding methods are not rich enough

Method used

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  • Method and system for embedding and extracting radio frequency watermark based on qpsk signal modulation
  • Method and system for embedding and extracting radio frequency watermark based on qpsk signal modulation
  • Method and system for embedding and extracting radio frequency watermark based on qpsk signal modulation

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Embodiment Construction

[0042] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The process of the method for embedding and extracting radio frequency watermark based on QPSK signal modulation proposed by the present invention is as follows figure 1 Shown include:

[0044] (1) Embedding steps of radio frequency watermark signal;

[0045] (11) First, add a fixed synchronization header sequence before the carrier symbol sequence x, and then segment the carrier symbol sequence acco...

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Abstract

The invention discloses a QPSK signal modulation-based radio frequency watermark embedding and extracting method and system. The method comprises the following steps: a radio frequency watermark embedding step of: converting a watermark signal into a watermark code element sequence, superposing the watermark code element sequence with a segmented carrier code element sequence according to signal amplitudes of the two sequences, and carrying out QPSK modulation and emission; a radio frequency demodulation step of: carrying out frequency reduction and normalization processing on a received QPSK signal to obtain a signal, and comparing the signal with a standard star map to obtain a carrier code element; and a radio frequency watermark signal extracting step of: taking a difference value between a normalized sampling signal and the carrier code element as original data for watermark extraction, demodulating two watermarks of a watermark real part and a watermark virtual part from the data, and judging the watermark results through sign functions. The invention furthermore provides a system for realizing the method. Through adding radio frequency watermark signals in physical signals at bottom layers, the digital watermark hiding methods are enriched.

Description

Technical field [0001] The invention relates to the field of digital watermarking, in particular to a method for embedding and extracting radio frequency watermarks based on QPSK (Quadrature Phase Shift Keying) signal modulation. Background technique [0002] Digital watermarking technology is to directly embed some identification information into the digital carrier through a certain algorithm, but it does not affect the use value of the original carrier, and it is not easy to be noticed or noticed by the human perception system. It can only be extracted through a special method or detection system. . The watermark information can be the author’s serial number, company logo, text with special meaning, etc. The watermark information hidden in the carrier can be used to identify the source, version, original author, and original author of a document, image or music product. Owners, issuers, and legal users of digital products. Digital watermarking is an important research direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04K1/10H04B1/707H04L27/20H04L27/22
CPCH04B1/707H04K1/10H04L27/20H04L27/22
Inventor 徐争光李良杰袁文静黄本雄
Owner HUAZHONG UNIV OF SCI & TECH
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