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Cutoff rate for the M-ary PSK modulation channel with optimal quantum detection

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3 Author(s)
Charbit, M. ; Lab. des Signaux et Syst., Ecole Superieure d''Electr., Gif-sur-Yvette, France ; Bendjaballah, C. ; Helstrom, C.W.

The cutoff rate R0 of an optical channel transmitting M-ary phase-shift-keyed coherent states is calculated for a receiver using the optimum quantum detector. This is shown to be nearly equivalent, when M≫1, to a system that measures the phase of the received signal. A closed-form expression yielding a good approximation to R0 is derived

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Information Theory, IEEE Transactions on  (Volume:35 ,  Issue: 5 )