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Information Theoretic Analysis of Smart Radio Environment

Haji Abdollahi Bafghi, Ali | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56028 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Kenari, Masoumeh; Mirmohseni, Mahtab
  7. Abstract:
  8. In this thesis, we analyze the degree of freedom (DoF) of wireless multi-user networks in the presence of smart radio environment. The two most important wireless multi-user networks, K-user interference channel, and M*N wireless X network are considered and the effects of the presence of a smart radio environment on the DoF of these networks are evaluated. To this end, first, we consider Intelligent Reflecting Surfaces (IRSs), which are a practical model of smart radio environments and can control the propagation of waves toward the desired direction in the environment. Then, we consider the instantaneous relay as a general theoretical model, which is the most comprehensive model for smart radio environments. For this purpose, first, we analyze the DoF region and the sum DoF of the K-user interference channel in the presence of different models of IRSs and derive their fundamental limits. Then, we study the performance in the presence of the instantaneous relay and obtain fundamental limits for its DoF. Next, we analyze the DoF region and the sum DoF of the M*N wireless X network in the presence of IRSs and derive their fundamental limits. Finally, we study the DoF of the M*N wireless X network in the presence of the instantaneous relay and obtain their fundamental limits. The analytical results of the DoF of the K-user interference channel in the presence of the IRS demonstrate that the maximum DoF of K can be achieved. For the active IRS, the maximum DoF of K is achieved with a finite number of elements, while for the passive IRS, the maximum DoF of K is achieved asymptotically and by tending the number of elements to infinity. The same results are valid for the instantaneous relay as a general theoretical model, and the maximum DoF of K can be achieved with a finite number of antennas. The analysis of the DoF of the M*N wireless X-network shows results similar to those obtained for the K-user interference channel. In summary, it is shown that the active IRS with a finite number of elements can achieve the maximum DoF of min(M,N) and the passive IRS asymptotically achieves the same value for the DoF. Also, the instantaneous relay can achieve the maximum DoF of min(M,N) with a finite number of antennas
  9. Keywords:
  10. Information Theory ; Intelligent Reflective Surfaces ; Instantaneous Relaying ; Multiuser Network ; Wreless Multi-User Networks Degree of Freedom (DoF) ; Interference Channel

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