Channel Characterization of Diffusion-based Molecular Communication with Multiple Fully-absorbing Receivers

TL;DR

This paper develops an analytical model for the impulse response of diffusion-based molecular communication channels with multiple fully-absorbing receivers, accounting for interference from neighboring nanomachines, validated by simulations.

Contribution

It introduces a novel analytical framework for modeling multi-receiver molecular communication channels considering interference effects.

Findings

Channel impulse response is distorted by neighboring receivers.

Presence of interferers causes a time shift in the absorption peak.

Analytical results are validated through particle-based simulations.

Abstract

In this paper an analytical model is introduced to describe the impulse response of the diffusive channel between a pointwise transmitter and a given fully-absorbing (FA) receiver in a molecular communication (MC) system. The presence of neighbouring FA nanomachines in the environment is taken into account by describing them as sources of negative molecules. The channel impulse responses of all the receivers are linked in a system of integral equations. The solution of the system with two receivers is obtained analytically. For a higher number of receivers the system of integral equations is solved numerically. It is also shown that the channel impulse response shape is distorted by the presence of the interferers. For instance, there is a time shift of the peak in the number of absorbed molecules compared to the case without interference, as predicted by the proposed model. The analytical derivations are validated by means of particle based simulations.