ABSTRACT
This paper proposes a methodological framework to optimize RIS reflection matrices targeting AFD reduction, enhancing communication reliability and quality-of-service in time-varying channels.
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Key findings
A mathematical relationship between RIS phase-shift configurations and AFD is established.
An AFD-aware optimization algorithm is proposed, balancing ergodic rate and fade duration.
Theoretical bounds on AFD reduction are characterized based on the number of RIS elements.
A comprehensive experimental validation plan and risk assessment are outlined.
Limitations & open questions
Potential failure modes include channel estimation errors and hardware impairments.