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Abstract: The secrecy capacity of a discrete memoryless Gaussian Wire-Tap Channel whenthe input is from a finite complex constellation is studied. It is shown thatthe secrecy capacity curves of a finite constellation plotted against the SNR,for a fixed noise variance of the eavesdropper-s channel has a global maximumat an internal point. This is in contrast to what is known in the case ofGaussian codebook input where the secrecy capacity curve is a bounded,monotonically increasing function of SNR. Secrecy capacity curves for some wellknown constellations like BPSK, 4-QAM, 16-QAM and 8-PSK are plotted and the SNRat which the maximum occurs is found through simulation. It is conjectured thatthe secrecy capacity curves for finite constellations have a single maximum.



Autor: G. D. Raghava, B. Sundar Rajan

Fuente: https://arxiv.org/







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