2,710 research outputs found
Amplify-and-Forward Relaying in Two-Hop Diffusion-Based Molecular Communication Networks
This paper studies a three-node network in which an intermediate
nano-transceiver, acting as a relay, is placed between a nano-transmitter and a
nano-receiver to improve the range of diffusion-based molecular communication.
Motivated by the relaying protocols used in traditional wireless communication
systems, we study amplify-and-forward (AF) relaying with fixed and variable
amplification factor for use in molecular communication systems. To this end,
we derive a closed-form expression for the expected end-to-end error
probability. Furthermore, we derive a closed-form expression for the optimal
amplification factor at the relay node for minimization of an approximation of
the expected error probability of the network. Our analytical and simulation
results show the potential of AF relaying to improve the overall performance of
nano-networks.Comment: 7 pages, 6 figures, 1 table. Submitted to the 2015 IEEE Global
Communications Conference (GLOBECOM) on April 15, 201
Decision-Feedback Detection for Bidirectional Molecular Relaying with Direct Links
In this paper, we consider bidirectional relaying between two diffusion-based
molecular transceivers (bio-nodes). As opposed to existing literature, we
incorporate the effect of direct diffusion links between the nodes and leverage
it to improve performance. Assuming network coding type operation at the relay,
we devise a detection strategy, based on the maximum-likelihood principle, that
combines the signal received from the relay and that received from the direct
link. At the same time, since a diffusion-based molecular communication channel
is characterized by high inter-symbol interference (ISI), we utilize a decision
feedback mechanism to mitigate its effect. Simulation results indicate that the
proposed setup incorporating the direct link can achieve notable improvement in
error performance over conventional detection schemes that do not exploit the
direct link and/or do not attempt to mitigate the effect of ISI
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