The article "Wireless Powered Communication: Opportunities and Challenges" by Suzhi Bi, Chin Keong Ho, and Rui Zhang discusses the advancements and potential of wireless powered communication (WPC) enabled by radio frequency (RF)-based wireless energy transfer (WET) technology. WPC addresses the limitations of battery life in wireless devices by providing continuous and stable energy through RF signals, enabling more efficient and sustainable communication. The authors highlight the advantages of WPC, such as improved user experience, reduced maintenance costs, and enhanced flexibility in deployment, particularly in IoT/IoE systems, wireless sensor networks (WSNs), and smart power grids. The article reviews the state-of-the-art RF-enabled WET technologies, including inductive coupling, magnetic resonant coupling, and EM radiation, each with its own strengths and limitations. It emphasizes the benefits of RF-enabled WET, such as long operating ranges, low production costs, and efficient energy multicasting. The authors introduce the concept of simultaneous wireless information and power transfer (SWIPT), where both energy and information are transmitted using the same waveform, optimizing spectrum usage. They discuss the design challenges and solutions for SWIPT, including rate-energy trade-offs and practical receiver structures like time switching, power splitting, integrated ID/EH receivers, and antenna switching. The article also explores the design of wireless powered communication networks (WPCNs), focusing on the harvest-then-transmit protocol and the doubly-near-far problem, which involves balancing energy harvesting and data transmission for users at different distances from the energy transmitter. Solutions to this problem include time division multiple access (TDMA), spatial division multiple access (SDMA), and user cooperation. Finally, the authors outline future research directions, including the coexistence of energy and information networks, cross-layer design, hardware implementation, and health and safety considerations. They emphasize the need for extensive testing and prototyping to evaluate the feasibility and performance of WPC in practical environments.The article "Wireless Powered Communication: Opportunities and Challenges" by Suzhi Bi, Chin Keong Ho, and Rui Zhang discusses the advancements and potential of wireless powered communication (WPC) enabled by radio frequency (RF)-based wireless energy transfer (WET) technology. WPC addresses the limitations of battery life in wireless devices by providing continuous and stable energy through RF signals, enabling more efficient and sustainable communication. The authors highlight the advantages of WPC, such as improved user experience, reduced maintenance costs, and enhanced flexibility in deployment, particularly in IoT/IoE systems, wireless sensor networks (WSNs), and smart power grids. The article reviews the state-of-the-art RF-enabled WET technologies, including inductive coupling, magnetic resonant coupling, and EM radiation, each with its own strengths and limitations. It emphasizes the benefits of RF-enabled WET, such as long operating ranges, low production costs, and efficient energy multicasting. The authors introduce the concept of simultaneous wireless information and power transfer (SWIPT), where both energy and information are transmitted using the same waveform, optimizing spectrum usage. They discuss the design challenges and solutions for SWIPT, including rate-energy trade-offs and practical receiver structures like time switching, power splitting, integrated ID/EH receivers, and antenna switching. The article also explores the design of wireless powered communication networks (WPCNs), focusing on the harvest-then-transmit protocol and the doubly-near-far problem, which involves balancing energy harvesting and data transmission for users at different distances from the energy transmitter. Solutions to this problem include time division multiple access (TDMA), spatial division multiple access (SDMA), and user cooperation. Finally, the authors outline future research directions, including the coexistence of energy and information networks, cross-layer design, hardware implementation, and health and safety considerations. They emphasize the need for extensive testing and prototyping to evaluate the feasibility and performance of WPC in practical environments.