Abstract
Watermarking is a technique that provides ownership rights for shared data, and this technique can also help to transmit confidential information to realize secure communication. In this paper, we design a blind digital watermarking based on Discrete Wavelet Transform-Discrete Cosine Transform-Singular Value Decomposition (DWT-DCT-SVD) and optimize it by genetic algorithm (GA). This watermarking has both high robustness and high imperceptibility. Then we design a transmitter and receiver system based on the IEEE 802.11a and software-defined radio (SDR). We adopt several optimization methods for the system, such as ACK/HARQ mechanism, different redundant coding, frame length adaption, adaptive modulation, and so on, aiming to improve communication reliability and rate. We verify its high communication reliability and rate through actual experiments and complete the combination of digital watermarking and wireless transmission. We could build the application scenario of Image Security Wireless Communication based on Wireless Local Area Network (WLAN) protocol and SDR platform indoors or outdoors in small areas.
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