Pulse Shaping for MC via Particle Size

TL;DR

This paper proposes a pulse shaping method in molecular communication by optimizing the mixture of particles of different sizes to improve detection reliability and simplify synchronization, demonstrated through a diffusion channel model.

Contribution

It introduces a novel particle size mixture optimization approach for pulse shaping in molecular communication to enhance detection performance and synchronization.

Findings

Optimal particle size mixtures balance detection duration and peak detection value.

Tradeoff exists between detection duration and peak detection based on particle sizes.

Simulation confirms improved detection reliability with optimized particle mixtures.

Abstract

In molecular communication (MC), combining different types of particles at the transmitter is a degree of freedom which can be utilized to improve performance. In this paper, we address the problem of pulse shaping to simplify time synchronization requirements by exploiting and combining the received signal characteristics of particles of different sizes. In particular, we optimize the mixture of particles of different sizes used for transmission in order to support a prescribed detection time period for on-off keying, guaranteeing on average 1) a sufficiently large received signal if a binary one is transmitted, and 2) a low enough received signal if a binary zero is transmitted even in the presence of inter-symbol interference. For illustration, we consider an optimization problem based on a free space diffusion channel model. It is shown that there is a tradeoff between the maximum feasible detection duration and the peak detection value for different particle sizes from the smallest particle size enabling the largest detection duration to the largest particle size minimizing the peak detection value at the expense of a limited detection duration.