Intelligent Reflecting Surface Versus Decode-and-Forward: How Large Surfaces are Needed to Beat Relaying?

The rate and energy efficiency of wireless channels can be improved by deploying software-controlled metasurfaces to reflect signals from the source to the destination, especially when the direct path is weak. While previous works mainly optimized the reflections, this letter compares the new techno...

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Bibliographic Details
Published in:IEEE wireless communications letters 2020-02, Vol.9 (2), p.244-248
Main Authors: Bjornson, Emil, Ozdogan, Ozgecan, Larsson, Erik G.
Format: Article
Language:English
Subjects:
DF relaying
Energy dissipation
Energy efficiency
Intelligent reflecting surface
New technology
Power efficiency
Receivers
Reconfigurable intelligent surfaces
Relaying
Relays
Resource description framework
Signal to noise ratio
Surface waves
Transceivers
Wireless communication
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Summary:The rate and energy efficiency of wireless channels can be improved by deploying software-controlled metasurfaces to reflect signals from the source to the destination, especially when the direct path is weak. While previous works mainly optimized the reflections, this letter compares the new technology with classic decode-and-forward (DF) relaying. The main observation is that very high rates and/or large metasurfaces are needed to outperform DF relaying, both in terms of minimizing the total transmit power and maximizing the energy efficiency, which also includes the dissipation in the transceiver hardware.
ISSN:2162-2337
2162-2345
2162-2345
DOI:10.1109/LWC.2019.2950624