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Power Optimization in Wireless Two-Way Relay Channel

Rahimzamani, Arman | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45321 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Golestani, Jamaloddin; Omidi, Mohammadjavad
  7. Abstract:
  8. Technological developments in today’s world followed by the rapid rowth of energy consumption has given rise to global concerns about the environment. Hence, energy-efficiency is widely addressed in various areas of academic and industrial research. In communication technology too, energy-demanding systems such as wireless cellular networks have undergone immense and rapid developments, resulting in major concerns about their energy consumption.To address these concerns, the 4G generation of cellular standards provides an option for relay transmission in order to reduce the energy required for achieving a given communication rate in a certain area of coverage. In this thesis, we address the optimization of the consumed power in a wireless two-way relay channel (TWRC), with given required data rates for each direction of communication.We consider both the Amplify-and-Forward (AF) and the Decode-and-Forward (DF) relays, but mainly focus on the latter Scenario.As the first step, using an information theoretic approach, we provide a definition for the feasible power region of the two-way relay channel for given rates of communication, and try to characterize this region. We obtain the feasible power region for a two-way DF relay channel and show how the total average consumed power can be minimized using this region.Next, we consider some specific and more practical two-way relaying schemes and minimize the total consumed power for them. In these schemes, the data transmission procedure is divided into some separate phases, each of which takes place in an exclusive time interval.Many of the previous research works in this area have considered constant-length time intervals of equal duration for different phases, thereby reducing the problem at hand to a power allocation problem. In this work, however, we propose schemes based on communication phases with adaptively variable time intervals. Accordingly, optimizing power consumption boils down to a joint power allocation and time sharing problem. We show how our appraoch improves power consumption in the channel.Finally, we extend the discussed multi-phase approach to the optimization of consumed power in a multi-relay TWRC system
  9. Keywords:
  10. Power Optimization ; Wireless Networks ; Two-Way Relay Channel (TWRC) ; Data Transmission Rate Constraint

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