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In this letter, a parallel-combinatory-spreading-based weighted fractional Fourier transform (PCS-WFRFT) system aiming to guarantee physical layer (PHY) security is proposed. In this system, the transmission data are first divided into two groups. Based on the first group of data, a set of pseudonoise sequences is generated and then used to spread and encrypt the second group of data. In general, the proposed system is spread and dynamically encrypted by the message information itself, whereby both high bandwidth efficiency and high security performance are obtained. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate.
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Fang et al. (2014) studied this question.
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