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Multiple-Access Schemes in Molecular Communication Networks and Performance Analysis

Farahnak Ghazani, Maryam | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48647 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Kenari, Masoumeh
  7. Abstract:
  8. Molecular communication (MC), which has stimulated a great deal of interest in recent years, is a new paradigm for communication among nanoscale biological machines. In MC, molecules are carriers of information and information is encoded into concentration, type or releasing time of molecules. One of the issues in MC is to consider a network consisting of multiple nano-sensors or living cells, which intend to communicate with each other.In this thesis, we first consider multiple-access networks in MC. In multiple-access networks, multiple sender nano-machines intend to communicate with a receiver nano-machine through a common medium. We consider the receiver with ligandreceptors and investigate three multiple-access schemes, based on molecule and receptor types, i.e., same molecule types with Different Labelings and the Same Receptor types (DLSR), Different Molecule types with Different Receptor types (DMDR), and the Same Molecule types with the Same Receptor types (SMSR). We evaluate the capacity regions of these scenarios and derive their inner bounds. It is observed that the DLSR scenario has a larger capacity region compared to the other two scenarios.In the second part, we consider two-way relay networks in MC . In two-way relay networks, two nano-machines intend to communicate with each other through a nano-relay. In classic communication, to increase the throughput of the system,network coding is used. Two main classes of network coding schemes are straightforward network coding (SNC) and physical layer network coding (PNC). Straightforward network coding is directly applicable in MC using XOR gate at the molecular level. However, because of the complexity of XOR gate at the molecular level, SNC scheme is not a proper method in MC networks. Since in MC, the transmitted signals are positive, PNC scheme cannot be employed directly. Using the reaction of molecules, we propose a physical layer network coding scheme in MC networks with ligand-receptors. Then, we derive the error probability of the SNC and PNC schemes and compare them. It is observed that in addition to the simplicity of the proposed PNC scheme, it outperforms the SNC scheme
  9. Keywords:
  10. Molecular Communication ; Multiple Access ; Nanonetworks ; Molecular Multiple-Access Channel ; Molecular Two-Way Relary Networks

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