Molecular Communication Using Brownian Motion
Sachin Kadloor, Raviraj S. Adve, and Andrew W. Eckford
Inspired by biological communication systems, molecular communication has been proposed as a viable scheme
to communicate between nano-sized devices separated by a very short distance. Here, molecules are released by
the transmitter into the medium, which are then sensed by the receiver. This paper develops a preliminary version
of such a communication system focusing on the release of either one or two molecules into a fluid medium with
drift. We analyze the mutual information between transmitter and the receiver when information is encoded in the
time of release of the molecule. Simplifying assumptions are required in order to calculate the mutual information,
and theoretical results are provided to show that these calculations are upper bounds on the true mutual information.
Furthermore, optimized degree distributions are provided, which suggest transmission strategies for a variety of
Communications research has almost exclusively focused on systems based on electromagnetic prop-
agation. However, at scales considered in nano-technology, it is not clear that these methods are viable.
Inspired by the chemical-exchange communication performed by biological cells, this paper consid-
ers molecular communication , in which information is transmitted by an exchange of molecules.
Specifically we consider the propagation of individual molecules between closely spaced transmitters and