Is backscatter link stronger than direct link in reconfigurable intelligent surface-assisted system?
AuthorZhao, W; Wang, G; Atapattu, S; Tsiftsis, TA; Tellambura, C
Source TitleIEEE Communications Letters
University of Melbourne Author/sAtapattu Mudiyanselage, Saman
AffiliationElectrical and Electronic Engineering
Document TypeJournal Article
CitationsZhao, W., Wang, G., Atapattu, S., Tsiftsis, T. A. & Tellambura, C. (2020). Is backscatter link stronger than direct link in reconfigurable intelligent surface-assisted system?. IEEE Communications Letters, 24 (6), pp.1342-1346. https://doi.org/10.1109/LCOMM.2020.2980510.
Access StatusOpen Access
This letter considers integrating a backscatter link with a reconfigurable intelligent surface to enhance backscatter communication while assisting the direct communication. We derive the probability that the backscatter channel dominates in the composite channel. This probability is a useful performance measure to determine the number of reflectors. Since the exact probability lacks a closed-form solution, we develop two approximations by modeling the gain of the backscatter link with a Gaussian or Gamma distribution. We found that these approximations match well with the exact value. Importantly, with a well-designed number of reflectors, the channel gain of the backscatter link may be always stronger than that of the direct one.
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