Experimental Insights into RIS-Enhanced MIMO Channels in Urban Environments
arxiv(2023)
Abstract
Can the smart radio environment paradigm measurably enhance the performance
of contemporary urban macrocells? In this study, we explore the impact of
reconfigurable intelligent surfaces (RISs) on a real-world sub-6 GHz MIMO
channel. A rooftop-mounted macrocell antenna has been adapted to enable
frequency domain channel measurements to be ascertained. A nature-inspired beam
search algorithm has been employed to maximize channel gain at user positions,
revealing a potential 50% increase in channel capacity in certain
circumstances. Analysis reveals, however, that the spatial characteristics of
the channel can be adversely affected through the introduction of a RIS in
these settings. The RIS prototype schematics, Gerber files, and source code
have been made available to aid in future experimental efforts of the wireless
research community.
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