Spectrum Management for 6G RIS-SWIPT Systems

Abstract

In this chapter, we explore various aspects of spectrum management using multiple Reconfigurable Intelligent Surfaces (RIS) employing Simultaneous Wireless Information and Power Transfer (SWIPT) to support a resource-efficient solution to an Internet-of-Things (IoT) node with a power-splitting (PS) protocol. This study focuses on developing a communication framework that caters to data-intensive applications while prioritizing energy efficiency. Regarding multi-RIS selection, two strategies namely exhaustive RIS Approach (ERA) and optimum RIS Approach (ORA) are examined and compared for non-identical and independently distributed (ni.i.d) RIS fading channels. A case study for algorithmic frameworks is devised to optimize PS ratios and transmission power, aligning with the objectives of enhanced data rates. Numerical insights from the case study answer the prevailing questions in the literature about the RIS surface and element arrangement with the five scenarios. Furthermore, we acquire outcomes that align with higher rates and EH when dealing with lower frequencies. Thus, by addressing the twin challenges of energy-efficient communications and advanced spectrum management, this study provides valuable insights towards shaping the trajectory of future wireless communication systems. © 2025 The Institute of Electrical and Electronics Engineers, Inc.