A radio frequency watermark transmission method based on fsk signal modulation

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...

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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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