A radio frequency watermark transmission method based on fsk signal modulation

A signal modulation and transmission method technology, which is applied in transmission systems, frequency modulation carrier systems, electrical components, etc., can solve the problems of occupying frequency band transmission resources, energy loss, and aggravating the computational burden of sensor processing chips, so as to achieve concealed transmission and low error. The effect of bit rate

Active Publication Date: 2020-11-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the existing radio frequency watermarking schemes are not suitable for FSK modulation, which makes FSK modulation have many defects in practical applications. For example, when communicating with each node in the wireless sensor network, it is necessary to verify the identity information. The traditional method uses the key identity authentication mechanism , on the one hand, it will occupy the frequency band transmission resources, on the other hand, it will also increase the computational burden of the sensor processing chip, resulting in energy loss

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  • A radio frequency watermark transmission method based on fsk signal modulation
  • A radio frequency watermark transmission method based on fsk signal modulation
  • A radio frequency watermark transmission method based on fsk signal modulation

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[0038] 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.

[0039] A radio frequency watermark transmission method based on FSK signal modulation provided by the present invention mainly includes two parts: watermark embedding and watermark extraction, which will be described respectively below.

[0040] The block diagram of the watermark embedding system is as follows: figure 1 As shown, according to the set watermark embedding code rate 1 / M, first the watermark bit b n Repeat M times to become code element d n , according to the watermark symbol d n Design the watermark signal, then superimpose the watermark signal on the carrier signal, and transmit i...

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Abstract

The invention discloses a radio frequency watermark transmission method based on FSK (Frequency Shift Keying) signal modulation, which comprises the following steps: watermark embedding: repeating watermark bits for M times to obtain watermark code element bits; obtaining a watermark signal to be embedded according to the watermark code element bits and the watermark intensity; multiplying the watermark signal to be embedded by a set FSK baseband modulation signal to realize phase superposition, and finishing watermark embedding; signal transmission: carrying out carrier frequency modulation on the FSK baseband modulation signal embedded with the watermark, transmitting the FSK baseband modulation signal to a wireless channel, and acquiring a signal at a receiving end of a communication system; and extracting bit information contained in the watermark signal from the received FSK baseband modulation signal embedded with the watermark. By embedding the watermark signal into the phase of the FSK modulation signal, hidden transmission of specific information is achieved, meanwhile, additional phase components introduced due to the multipath effect can be eliminated, and the influence of the multipath effect on radio frequency watermark transmission is restrained.

Description

technical field [0001] The invention belongs to the field of radio frequency watermarking, and more specifically relates to a radio frequency watermark transmission method based on FSK signal modulation. Background technique [0002] Information hiding is a long-term concern. The traditional information hiding carrier is multimedia data represented by video, image and audio. By embedding watermark in multimedia data, it can be transmitted without affecting the normal transmission of video, image and audio. Next, the watermark is detected by a specific method at the receiving end, so as to realize the transmission of the watermark signal. This technology is usually called digital watermarking. Digital watermarking can be used to transmit copyright information of video, image and audio to achieve the goal of copyright protection; it can also be used to transmit some confidential information to achieve military confidential communication purposes. However, multimedia data is e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L27/12H04L27/10
CPCH04L27/10H04L27/12H04L63/0428
Inventor 徐争光刘倩
Owner HUAZHONG UNIV OF SCI & TECH
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