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Sensors 2015, 15(12), 30827-30838; doi:10.3390/s151229830

Maximum-Likelihood Estimator of Clock Offset between Nanomachines in Bionanosensor Networks

1
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China
2
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798
*
Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Received: 2 October 2015 / Revised: 28 November 2015 / Accepted: 1 December 2015 / Published: 7 December 2015
(This article belongs to the Section Sensor Networks)
View Full-Text   |   Download PDF [1383 KB, uploaded 7 December 2015]   |  

Abstract

Recent advances in nanotechnology, electronic technology and biology have enabled the development of bio-inspired nanoscale sensors. The cooperation among the bionanosensors in a network is envisioned to perform complex tasks. Clock synchronization is essential to establish diffusion-based distributed cooperation in the bionanosensor networks. This paper proposes a maximum-likelihood estimator of the clock offset for the clock synchronization among molecular bionanosensors. The unique properties of diffusion-based molecular communication are described. Based on the inverse Gaussian distribution of the molecular propagation delay, a two-way message exchange mechanism for clock synchronization is proposed. The maximum-likelihood estimator of the clock offset is derived. The convergence and the bias of the estimator are analyzed. The simulation results show that the proposed estimator is effective for the offset compensation required for clock synchronization. This work paves the way for the cooperation of nanomachines in diffusion-based bionanosensor networks. View Full-Text
Keywords: molecular communication; bionanosensor networks; diffusion; clock synchronization molecular communication; bionanosensor networks; diffusion; clock synchronization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lin, L.; Yang, C.; Ma, M. Maximum-Likelihood Estimator of Clock Offset between Nanomachines in Bionanosensor Networks. Sensors 2015, 15, 30827-30838.

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