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Optimum Power Allocation in Multiple Access Channel with Conferencing Encoders, Conferencing Decoders and Relay Channel

Gholami Davoodi, Arash | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42337 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Aref, Mohammad Reza
  7. Abstract:
  8. As the achievability of higher rates in wireless channels is a challenging issue, analysis of efficient and practical power allocation policies for different wireless channels such as Multiple Access Channel(MAC), Relay Channel, Interference Channel is one of the research interests for many years. Convex optimization or generally optimization is one of the important problems in communication science. Optimum power allocations are also a discussing argument in information theory which in these problems the objective function is usually the transmitting rate and the problem's constraints are power constraints which must be satisfied. In this thesis, first we investigate convex optimization approaches in information theory and afterwards an approach for deriving optimum power allocations in different channels will be discussed. Optimum power allocations in three channels of MAC with conferencing encoders, MAC with conferencing decoders and relay channel are evaluated, which in each channel number of the inequalities for sum rate is an important issue. For relay channel and MAC with conferencing encoders there are two inequalities for sum rate, and it is proved that 3 cases for deriving the optimum power allocation will occur which in all of the three cases optimum power allocation is derived. power allocation in MAC with conferencing decoders is an more challenging problem as there are three inequalities for sum rate, seven cases for deriving power allocation, and more complicated equations of the sum rate than the other channels. In this scenario similar to the two other channels the optimum power allocations are derived for all the seven cases and in all of the three scenarios in the last the optimum power allocations are derived numerically
  9. Keywords:
  10. Fading ; Multiple Access Relay Channel (MARC) ; Power Allocation ; Conferencing Encoders ; Conferencing Decoders

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