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. The molecules 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 electromagnetic waves, but we encode
our information into 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 with
average and peak delay constraints.

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 and peak-delay constraints are
loosened 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 Aug 19 12:06:03 UTC+8 2013