Abstract
A multi-user localization system that uses modulated reconfigurable intelligent surfaces (RIS) is proposed. In this system, a base-station (BS) sends an unmodulated carrier, multiple RISs reflect the carrier after applying a phase shift which encodes an <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$M$ </tex-math></inline-formula> -sequence, and time-difference-of-arrival is calculated at the receivers to estimate its location. The proposed scheme is simulated in a specific street-canyon setting where it is shown to achieve sub-meter accuracy. Finally, possible improvements are discussed.
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