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 neighbouring FA 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.
Highlights
Despite the initial studies of molecular communication (MC) have focused on static situations, where transmitting and receiving bio-nanomachines are in fixed positions, some recent research works have relaxed this condition to move towards more realistic dynamic scenarios with mobile nodes
In this paper we focus on an MC via diffusion (MCvD) system defined by a single pointwise transmitter and multiple mobile FA receivers
An emerging research area in molecular communication (MC) is represented by the investigation of environments where bio-nanomachines coordinate their activities in a network
Summary
The recent advancements in synthetic biology and bionanotechnology have opened the way to new opportunities in many application fields, such as medicine, tissues and materials engineering, and environmental monitoring and preservation [1], [2] The basis of such progresses is the possibility that bio-nanomachines cooperate, which is possible only when they are organized in a network and a communication can be established among the constituting nodes [3]. For the two mentioned cases, all the receiving bio-nanomachines are able to collectively sense molecules that are released from the target site [9]. In order to evaluate the performance of MC systems it is needed to develop suitable channel models for scenarios where there are multiple bio-nanomachines that collectively sense the molecules released by a transmitter, i.e. the target site. The main contribution consists in the introduction of an MCvD channel model that takes into account the instantaneous relative position of each receiver with respect to the pointwise transmitter
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