Browsing by Author "Yeh, Ping-Cheng"

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Modeling Molecular Communications in Tubes With Poiseuille Flow and Robin Boundary Condition
(2019-08-01)
Lo, Yun-Feng
;
Lee, Chia-Han
;
Chou, Po-Chun
;
Yeh, Ping-Cheng
;
電機工程學系
Accurately modeling the molecular channel is crucial for the design and analysis of molecular communications. In this letter, we propose a Markovian-based channel model for molecular communications in tubes with Poiseuille flow and the Robin boundary condition. The cross section of the tube is divided into rings and the continuously varying flow velocity field is approximated by the mean of the flow velocity on each ring. The radial displacement of molecules versus time is modeled by a Markov chain, and then the probability density function of the axial displacement is modeled using this Markov chain and the approximated flow velocity field. The accuracy of the proposed model is verified through particle-based simulations.
Training-based Synchronization for Quantity-based Modulation in Inverse Gaussian Channels
(2017-01-01)
Hsu, Bo-Kai
;
Chou, Po-Chun
;
Lee, Chia-Han
;
Yeh, Ping-Cheng
;
電機工程學系
In time-slotted molecular communication systems, clock synchronization between transmitter and receiver is crucial. In this paper, training-based synchronization schemes in a molecular communication system with quantity-based modulation are proposed by utilizing the information of arrival times of molecules. For timing offset estimation, three estimators are proposed, including maximum likelihood estimation (MLE), unbiased linear estimation (ULE), and iterative ULE. For clock skew estimation, two algorithms, arithmetic mean estimation and weighted mean estimation, are proposed. Simulation results demonstrate that the proposed estimators are effective.