Molecular relay channels are discussed in a recently published paper by Prof. Tadashi Nakano of Osaka University, and Dr. Jian-Qin Liu of the National Institute of Information and Communications Technology, Japan. The paper studies these channels from an information-theoretic perspective; the goal is to understand a particular form of molecular communication channels in terms of "bits". In the authors' model, the transmitter releases signals based on a bit sequence, the environment (channels) propagates the signals, and the reciever senses the channels to decode the bit sequence. Computer simulations are used to investigate the impact of various model parameters on the amount of information transmitted from the sender to the receiver.
T. Nakano and J. Q. Liu, "Design and analysis of molecular relay channels: An information theoretic approach," IEEE Transactions on Nanobioscience, vol. 9, no. 3, pp. 213-221, 2010. [IEEEXplore]