Scientists develop an energy-efficient wireless power and information transfer system

Science Daily   September 5, 2023
A simultaneous wireless information and power transfer (SWIPT)-enabled nonorthogonal multiple access (NOMA) system has been recognized as a promising technology for enabling the Industrial Internet of Things (IIoT), as it extends the lifetime of small battery-driven sensors. However, its energy efficiency significantly decreases with distance from the central controller. Researchers in South Korea proposed a framework for applying SWIPT-aided NOMA system to a distributed antenna system (DAS) to improve the spectral efficiency and energy efficiency of the IIoT. They optimized the power allocation for the NOMA signaling and power splitting for SWIPT in the DAS to maximize energy efficiency while reaching the minimum harvested energy and data rate requirements. They divided the optimization problem into subproblems and presented an iterative algorithm for finding the optimal solution. Extensive simulation showed improvements in energy efficiency relative to conventional schemes. Their system provided energy efficiency of more than five times that of SWIPT-NOMA without DAS, and more than 10% improvement compared with SWIPT-OMA-DAS… read more. TECHNICAL ARTICLE