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This paper proposes a chaotic constellation transformation (CCT) technique for physical-layer security enhancement in orthogonal frequency-division multiple access based passive optical networks (OFDMA-PONs). The CCT is performed by using an advanced cat map whose control parameters are generated by a cross chaotic map. Moreover, a pilot-aided security key agreement scheme is proposed to ensure that...
In this paper, we propose an underlay spectrum sharing scheme where a secondary broadcast system shares the spectrum with a pair of primary users. Both primary and secondary users are discrete rate-power adaptive systems equipped with limited feedback of the channel quality information. By overhearing the primary feedback and receiving the feedback from each secondary receivers, the best secondary...
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