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Optimim Power and Frequency Allocation in Access Network Utilizing RF/FSO Links

Abdarbashi, Amir Bahador | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53079 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Salehi, Javad; Beyranvand, Hamzeh
  7. Abstract:
  8. The growth of broadband applications in networks such as IOT, video content sites, and 5G technology has called for an increase in the capacity of the network infrastructure. Free space optical channel has been proposed as an option to meet this need. The use of optical channels in free space, in comparison with fiber optic channels, has been considered to be used in 5G technology, due to presenting high bandwidth and low CAPEX. The availability of a free space optical channel is highly affected by weather conditions especially fog and snow particles. Hybrid radio and optical channels and deploying relays are two methods proposed to be used in free space optical communication networks, in order to guarantee channel availability in different weather conditions.In this research, a relay selection and optimal power allocation algorithm has been proposed for a multihop network with hybrid free space optical and radio frequency channels. The objective of this algorithm is to maximize the capacity available on the network by considering the power constraints for the transmitter and relays and the minimum speed available to each transmitter. Relay selection and optimal power allocation are the results of solving a mixed integer non-linear programing (MINLP) problem. Due to the complexity of solving the MINLP problem, we solve the optimization problem using the Lagrange dual method. Numerical results show that the hybrid free space optical and radio frequency network guarantees channel availability in different weather conditions. Also, in using relays to increase the available capacity and make the system more resistant to various weather conditions, fewer relays are required in comparison with free space optical networks
  9. Keywords:
  10. Subcarrier Allocation ; Free Space Optical System ; Effective Capacity ; Optimal Power Allocation ; Internet of Things ; Mixed Integer Nonlinear Programming (MINLP)

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