In this thesis a very recent and new channel model is investigated
that describes communication based on the exchange of chemical
molecules in a liquid medium with constant drift. They travel from the
transmitter to the receiver at two ends of a one-dimensional axis. A
typical application of such communication are nano-devices inside a
blood vessel communicating with each other. In this case, we no longer
transmit our signal via electromegnetic waves, but we put our
information on the emission time of the molecules. Once a molecule is
emitted in the fluid medium, it will be affected by Brownian motion,
which causes uncertainty of the molecule’s arrival time at the
receiver. We characterize this noise with an inverse Gaussian
distribution. Here we focus solely on an additive noise channel to
describe the fundamental channel capacity behavior.

This new model is investigated and new analytical upper and lower
bounds on the capacity are presented. The bounds are asymptotically
tight, i.e., if the average-delay constraint is loosened to infinity
or if the drift velocity of the liquid medium tends to infinity, the
corresponding asymptotic capacities are derived precisely.

-||-   _|_ _|_     /    __|__   Stefan M. Moser
[-]     --__|__   /__\    /__   Senior Researcher & Lecturer, ETH Zurich, Switzerland
_|_     -- --|-    _     /  /   Adj. Professor, National Chiao Tung University (NCTU), Taiwan
/ \     []  \|    |_|   / \/    Web: http://moser-isi.ethz.ch/

Last modified: Mon Apr 30 15:46:26 UTC+8 2012