Efficient Methods for Transmission and Reception of Information in Molecular Communication Systems

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Mosayebi, Reza | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45905 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Nasiri-Kenari, Masoumeh; Gohari, Amin
Abstract:
This thesis studies on diffusion-based molecular communication channel between two nano-machines. The effect of the amount of memory on performance is characterized, and a simple memory-limited decoder is proposed and its performance is shown to be close to that of the best possible decoder (without any restrictions on the computational complexity or its functional form), using Genie-aided upper bounds. This effect is studied for the case of Molecular Concentration Shift Keying; it is shown that a four-bits memory achieves nearly the same performance as infinite memory. Then a general class of threshold decoders is considered and shown not to be optimal for a Poisson channel with memory, unless SNR is higher than a value specified in the paper. Another contribution is to show that receiver sampling at a rate higher than the transmission rate, i.e., a multi-read system, can significantly improve the performance. The associated decision rule for this system is shown to be a weighted sum of the samples during each symbol interval. The performance of the system is analyzed using the saddle point approximation. The best performance gains are achieved for an oversampling factor of three
Keywords:
Modulation ; Optimum Receiver ; Suboptimum ; Molecular Communication