University of Cambridge > Talks.cam > Signal Processing and Communications Lab Seminars > How Much Energy Is Required to Send One Bit Reliably over the Poisson Channel with Feedback?

How Much Energy Is Required to Send One Bit Reliably over the Poisson Channel with Feedback?

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We study the transmission of a single bit over the continuous-time optical Poisson channel with noiseless feedback. We show that the energy required to send the bit reliably is equal, on the average, to half the energy of a photon. We then consider sending one of M messages and show that the required energy is (M-1)/M of the energy of a photon. With the energy of one photon we can thus send as many bits and we want reliably. These results hold irrespective of the intensity of the dark current.

In discussing these results I shall highlight the difference between the concept of the “required energy per bit” and the “required energy to send a single bit”.

I shall assume only a smidgen of Information Theory and only the basic properties of the Poisson and Exponential distributions.

Joint work with Shahab Asoodeh and Ligong Wang

This talk is part of the Signal Processing and Communications Lab Seminars series.

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