94 research outputs found
Toward a Wired Ad Hoc Nanonetwork
Nanomachines promise to enable new medical applications, including drug
delivery and real time chemical reactions' detection inside the human body.
Such complex tasks need cooperation between nanomachines using a communication
network. Wireless Ad hoc networks, using molecular or electromagnetic-based
communication have been proposed in the literature to create flexible
nanonetworks between nanomachines. In this paper, we propose a Wired Ad hoc
NanoNETwork (WANNET) model design using actin-based nano-communication. In the
proposed model, actin filaments self-assembly and disassembly is used to create
flexible nanowires between nanomachines, and electrons are used as carriers of
information. We give a general overview of the application layer, Medium Access
Control (MAC) layer and a physical layer of the model. We also detail the
analytical model of the physical layer using actin nanowire equivalent
circuits, and we present an estimation of the circuit component's values.
Numerical results of the derived model are provided in terms of attenuation,
phase and delay as a function of the frequency and distances between
nanomachines. The maximum throughput of the actin-based nanowire is also
provided, and a comparison between the maximum throughput of the proposed
WANNET, vs other proposed approaches is presented. The obtained results prove
that the proposed wired ad hoc nanonetwork can give a very high achievable
throughput with a smaller delay compared to other proposed wireless molecular
communication networks.Comment: submitted to IEEE International Conference on Communications 2020
(ICC 2020
Diffusive Mobile Molecular Communications Over Time-Variant Channels
This letter introduces a formalism for modeling time-variant channels for
diffusive molecular communication systems. In particular, we consider a fluid
environment where one transmitter nano-machine and one receiver nano-machine
are subjected to Brownian motion in addition to the diffusive motion of the
information molecules used for communication. Due to the stochastic movements
of the transmitter and receiver nano-machines, the statistics of the channel
impulse response change over time. We show that the time-variant behaviour of
the channel can be accurately captured by appropriately modifying the diffusion
coefficient of the information molecules. Furthermore, we derive an analytical
expression for evaluation of the expected error probability of a simple
detector for the considered system. The accuracy of the proposed analytical
expression is verified via particle-based simulation of the Brownian motion.Comment: 4 pages, 3 figures, 1 table. Accepted for publication in IEEE
Communications Letters (Author's comment: Manuscript submitted Jan. 19, 2017;
revised Feb. 20, 2017; accepted Feb. 22, 2017
Conception et évaluation de nouvelles méthodes pour améliorer les performances des réseaux de nano-communication
Abstract : The field of nanotechnology has undergone very rapid and fascinating development in
recent years. This rapid and impressive advance has led to new applications of nanotechnology
in the biomedical and military industries, making it a key area of research
in multidisciplinary fields. However, the individual processing capacity of nanodevices is
very limited, hence the need to design nanonetworks that allow the nanodevices to share
information and to cooperate with each other. There are two solutions to establish a nanocommunication
system: either by adapting the classical electromagnetic communication
to the requirements of nano scale, or by using biological nanosystems inspired by nature
such as the molecular communication proposed in the literature. In this thesis, we are interested in the second solution, which is exploiting the potential of biological nanosystems used by nature since billions of years to design biocompatible nanonetworks that can be used inside the human body for medical applications. Nevertheless, the use of this new paradigm is not without challenges. The very low achievable throughput and the Inter-Symbol Interference (ISI) are the most influential problems on
the quality of molecular communication. The main objective of this thesis is to design and evaluate new methods inspired by nature in order to enhance the performance of nano-communication systems. To do this, the work is divided into three main parts. In the first part, we enhance the performance of molecular communication by proposing a new method that uses a photolysis-reaction instead of using enzyme to better attenuate ISI. We also propose an optimization of the receiver used in MIMO systems by judiciously
choosing the parameters used in its design to reduce the influence of path loss on the quality of the system. The second part proposes a new wired nano-communication system based on self-assembled
polymers that build an electrically conductive nanowire to connect the nanodevices to each
other. The use of electrons as information carriers drastically increases the achievable
throughput and reduces the delay. We study the dynamic process of self-assembly of the
nanowire and we propose a bio-inspired receiver that detects the electrons sent through
the conductive nanowire and converts them into a blue light. The third part applies the proposed wired nano-communication system to design an architecture ofWired Ad hoc NanoNETworks (WANNET) with a physical layer, Medium Acess Control (MAC) layer and application layer. We also calculate the maximum throughput and we evaluate the performance of the system.Le domaine des nanotechnologies a connu un développement très rapide et fascinant ces dernières années. Cette avancée rapide et impressionnante a conduit à de nouvelles applications dans les industries biomédicale et militaire, ce qui en fait un champ clé de recherche dans des domaines multidisciplinaires. Cependant, la capacité de traitement individuelle des nanodispositifs est très limitée, d'où la nécessité de concevoir des nanoréseaux qui permettent aux nanodispositifs de partager des informations et de coopérer entre eux. Il existe deux solutions pour mettre en place un système de nano-communication: soit en adaptant la communication électromagnétique classiques aux exigences de la nano échelle, soit en utilisant des nanosystèmes inspirés de la nature comme la communication moléculaire. Dans cette thèse, nous nous intéressons à la deuxième solution, qui exploite le potentiel des nanosystèmes biologiques utilisés par la nature depuis des milliards d'années pour concevoir des nanoréseaux biocompatibles pouvant être utilisés à l'intérieur du corps humain pour des applications médicales. Néanmoins, l'utilisation de ce nouveau paradigme n'est pas sans défis. Le très faible débit réalisable et l'Interférence Entre Symboles (IES) sont les problèmes les plus influents sur la qualité de la communication moléculaire. L'objectif principal de cette thèse est de concevoir et d'évaluer de nouvelles méthodes inspirées de la nature afin d'améliorer les performances des systèmes de nano-communication. Pour ce faire, le travail est divisé en trois parties principales. Dans la première partie, nous améliorons les performances de la communication moléculaire en proposant une nouvelle méthode qui utilise une réaction de photolyse pour mieux atténuer l'IES. Nous proposons également une optimisation du receveur utilisé dans les systèmes MIMO en choisissant judicieusement les paramètres utilisés dans sa conception pour réduire l'influence de l'atténuation de trajet sur la qualité du système. La deuxième partie propose un nouveau système de nano-communication filaire basé sur des polymères auto-assemblés qui construisent un nanofil électriquement conducteur pour connecter les nanodispositifs les uns aux autres. L'utilisation d'électrons comme supports d'informations augmente considérablement le débit réalisable et réduit le délai. Nous étudions le processus dynamique d'auto-assemblage du nanofil et nous proposons un receveur bio-inspiré qui détecte les électrons envoyés et les convertit en une lumière bleue. La troisième partie applique le système de nano-communication filaire proposé pour concevoir une architecture d'un nanoréseau ad hoc filaire (Wired Ad hoc NanoNETworks) WANNET avec une couche physique, une couche de contrôle d'accès moyen (Medium Access Control) MAC et une couche d'application. Nous calculons également le débit maximum et nous évaluons les performances du système
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