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Relay Aided Intelligent Reconfigurable Surfaces Achieving the Potential Without So Many Antennas

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Document pages: 8 pages

Abstract: This paper proposes a novel relay-aided intelligent reconfigurable surface(IRS) architecture for future wireless communication systems. The proposedarchitecture, which consists of two side-by-side intelligent surfaces connectedvia a full-duplex relay, has the potential of achieving the promising gains ofintelligent surfaces while requiring much smaller numbers of reflectingelements. Consequently, the proposed IRS architecture needs significantly lesschannel estimation and beam training overhead and provides higher robustnesscompared to classical IRS approaches. Further, thanks to dividing the IRSreflection process over two surfaces, the position and orientation of thesesurfaces can be optimized to extend the wireless communication coverage andenhance the system performance. In this paper, the achievable rates andrequired numbers of elements using the proposed relay-aided IRS architectureare first analytically characterized and then evaluated using numericalsimulations. The results show that the proposed architecture can achieve thedata rate targets with much smaller numbers of elements compared to typical IRSsolutions, which highlights a promising path towards the practical deploymentof these intelligent surfaces.

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