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We propose and demonstrate a physical-layer encryption algorithm against chosen-plaintext attacks (CPAs) in optical orthogonal frequency-division multiplexing (OOFDM) transmission, where the cyphertexts are dynamically generated for the first time by incorporating the random feature of the input data. The multiple-fold encryption algorithm consists of chaotic subcarrier allocation scrambling in time/frequency...
A simple timing synchronization algorithm is proposed for IMDD optical OFDM. Accurate timing synchronization is demonstrated by simulations and experiments, with lower computation complexity.
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