10,001 research outputs found
Capacity of a Simple Intercellular Signal Transduction Channel
We model the ligand-receptor molecular communication channel with a
discrete-time Markov model, and show how to obtain the capacity of this
channel. We show that the capacity-achieving input distribution is iid;
further, unusually for a channel with memory, we show that feedback does not
increase the capacity of this channel.Comment: 5 pages, 1 figure. To appear in the 2013 IEEE International Symposium
on Information Theor
A refined analysis of the Poisson channel in the high-photon-efficiency regime
We study the discrete-time Poisson channel under the constraint that its
average input power (in photons per channel use) must not exceed some constant
E. We consider the wideband, high-photon-efficiency extreme where E approaches
zero, and where the channel's "dark current" approaches zero proportionally
with E. Improving over a previously obtained first-order capacity
approximation, we derive a refined approximation, which includes the exact
characterization of the second-order term, as well as an asymptotic
characterization of the third-order term with respect to the dark current. We
also show that pulse-position modulation is nearly optimal in this regime.Comment: Revised version to appear in IEEE Transactions on Information Theor
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