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Degrees of freedom of the K-User Interference channel assisted by active and passive IRSs

Abdollahi Bafghi, A. H ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2022.3159658
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2022
  4. Abstract:
  5. In this paper, we study the degrees of freedom (DoF) region and sum DoF of the time-selective K-user interference channel in the presence of intelligent reflecting surfaces (IRSs). We consider both active and passive IRSs. While both types of IRS can attenuate the amplitude and change the phase of a reflected electromagnetic wave, active IRSs are also capable of amplifying the wave. We derive inner and outer bounds for the DoF region and lower and upper bounds for the sum DoF of the K-user interference channel in the presence of an active IRS and prove that the maximum value of K for the sum DoF can be achieved if the number of IRS elements exceeds a certain finite value. The analysis framework developed for active IRSs forms the basis for our analysis of passive IRS-assisted systems. In particular, we present probabilistic inner and outer bounds for the DoF region and probabilistic lower and upper bounds for the sum DoF of the K-user interference channel in the presence of a passive IRS and prove that the lower bound for the sum DoF asymptotically approaches K as the number of IRS elements grows large. © 1972-2012 IEEE
  6. Keywords:
  7. Active and passive intelligent reflecting surface ; DoF region ; Sum DoF ; Degrees of freedom (mechanics) ; Electromagnetic pulse ; Probabilistic logics ; Active and passive intelligent reflecting surface ; Degree of freedom region ; Electromagnetic scattering ; Interference ; MIMO communication ; Reflecting surface ; Relay ; Sum degree of freedom ; Time-selective ; Time-selective K-user interference channel ; Upper Bound ; Signal interference
  8. Source: IEEE Transactions on Communications ; Volume 70, Issue 5 , 2022 , Pages 3063-3080 ; 00906778 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/9734015