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Molecular Communication System with Non-Absorbing Receiver

Vahraz Honary, University of Nebraska - Lincoln

Abstract

Technological development enables the use of Micro and Nano scale devices which need to establish a communication link with other devices or bio-structures in order to cooperate and perform the desired task. The two primary approaches in describing the molecular movement within a medium are governed based on the Brownian motion (BM) and the Fick's law. The Brownian motion is based on the thermal energy of the molecule and it can be represented as a combination of random movements by a single molecule, which can be found widely in the literature. On the other hand, we utilize Fick's law in a novel 3D model. In Fick's law, the molecular movement happens according to the gradient of the molecular concentration where molecules from higher concentration regions propagate to the lower concentration ones. We first describe our model in one-dimensional scenarios, and then improve the model to a 3D one. Afterwards, we show that BM and our model have the same molecular distributions. There are two primary types of receivers proposed in the literature, namely absorbing and non-absorbing receivers. In the absorbing type of receiver, the molecules will be eliminated from the communication system and therefore they will have no further effect over the molecular concentration. While in a non-absorbing type of receiver, the molecules after being detected by the receiver remain in the medium. As the non-absorbing type of receiver has an important role in molecular communication in nature, e.g., quorum sensing, we develop our model to be able to calculate non-absorbing scenarios as well. We then propose two novel detection methods. The first method is built upon utilizing the Trellis graphs of the received signals. Based on the bit-error-rate (BER) performance of different frequencies, we defined severe and non-severe ISI models. The second method is based on the special characteristic of the molecular channel, the accumulative behavior. As received molecules' quantities are accumulatively added up at the receiver we propose a novel detection method, based on the second derivation of the received signal. This detection method exhibits significant improvement compared with the first method.

Subject Area

Computer Engineering|Nanotechnology|Molecular physics

Recommended Citation

Honary, Vahraz, "Molecular Communication System with Non-Absorbing Receiver" (2021). ETD collection for University of Nebraska - Lincoln. AAI28086740.
https://digitalcommons.unl.edu/dissertations/AAI28086740

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