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Title: Molecular communication systems : design, modelling and experimentation
Author: Qiu, Song
ISNI:       0000 0004 6496 0051
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2017
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Molecular Communications (MC) is an increasingly attractive technique to enable the communication and networking of devices in environments where traditional communication techniques may not be suitable. MC has been used to convey information in both human society and in animal populations and been studied on both the microscale and the macroscale. On the basis of these studies, this thesis focuses on characterising MC channel models under different environments and examining the impact these models have on the communication performance. The thesis begins by reviewing the latest developments in MC including communication paradigm, channel models, modulation schemes and forward error correction codes. It then provides the comprehensive research methods used during the PhD, including the construction of complex propagation environments and molecular communication equipments, and explains the procedures of the experimentation. The thesis then goes on to analyse the channel model for static environment. A novel capture probability expression of a finite sized receiver and the performance metrics of bit error rate, throughput and round-trip-time are derived. Experimentally, the additive noise in the channel response was found to conform to a Nakagami distribution. Afterwards, the thesis characterises two dynamic channel models, namely, the fading distribution due to temperature fluctuations, which is validated by numerical simulations, and the mobile channel where both transmitter and receiver are in mobility and in order to combat transposition errors, positional-distance codes are applied. Furthermore, the energy model of the bacteria based mobile relay channel is proposed to demonstrate a superior energy efficiency. Finally, the thesis goes on to propose a potential application of MC to locate a hidden entity with an unknown location in a vast underwater search space. Two molecular messaging methods for location discovery are proposed: a chemical encoding messaging method, and a Rosenbrock gradient ascent algorithm. The two chemical methods are found to offer attractive performance trade-offs in complexity and robustness. To conclude, the potential future work on MC channel modelling is identified in complex geometric environments.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TK Electrical engineering. Electronics Nuclear engineering