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QPSK signal modulation-based radio frequency watermark embedding and extracting method and system

A technology of watermark embedding and signal modulation, which is applied in phase-modulated carrier systems, transmission systems, secure communications, etc., and can solve the problems that physical signals cannot be applied and digital watermark hiding methods are not rich enough.

Active Publication Date: 2016-12-07
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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  • QPSK signal modulation-based radio frequency watermark embedding and extracting method and system
  • QPSK signal modulation-based radio frequency watermark embedding and extracting method and system
  • QPSK signal modulation-based radio frequency watermark embedding and extracting method and system

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, 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 constitute a conflict with each other.

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

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

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

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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 watermarks, in particular to a radio frequency watermark embedding and extraction method based on QPSK (quadrature phase shift keying) signal modulation. Background technique [0002] Digital watermarking technology is to embed some identification information directly 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 perceived or noticed by the human perception system. It can only be extracted by special methods or detection systems. . The watermark information can be the author's serial number, company logo, text with special meaning, etc. Through these watermark information hidden in the carrier, it can be used to confirm the source, version, original author, The ownership of digital products by owners, issuers, and legal users. Digital watermarking is an important research direction of information hiding technolo...

Claims

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Application Information

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Patent Type & Authority Applications(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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