1. Introduction to Wireless Powered Communication Networks 1.1. Overview 1.1.1. Wireless Energy Transfer 1.1.2. Radio Frequency Energy Harvesting 1.2. Simultaneous Wireless Information and Power Transfer 1.2.1. Rate-Energy Tradeoff 1.2.2. Receiver Architecture Design in SWIPT 1.3. Wireless Powered Communication Networks 1.3.1. Baseline WPCN Model 1.3.2. Dual-Hop WPCN Model 1.3.3. WPCN Extensions and Challenges 1.4. IoT Applications 1.4.1. The Internet of Things 1.4.2. Application Requirements of the IoT 1.4.3. Wireless Powered Communications for IoT 1.5. Summary References 2. Enhancing Physical Layer Security in Wireless Powered Communication Networks 2.1. Introduction to Physical Layer Security 2.2. The State of The Art of PLS Schemes in WPCNs: A Signal Processing Perspective 2.3. Accumulate-then-Transmit: Secure WPCN in the Presence of Multiple Eavesdroppers 2.3.1. System Model and Protocol Design 2.3.2. Battery State Analysis 2.3.3. Performance Evaluation 2.3.4. Numerical Results 2.4. Accumulate-and-Jam: Secure WPCN via A Wireless-Powered Full-Duplex Jammer 2.4.1. System Model and Protocol Design 2.4.2. Hybrid Energy Storage State Analysis 2.4.3. Performance Evaluation 2.4.4. Numerical Results 2.5. Summary References 3. Extending Wireless Powered Communication Networks for Future Internet of Things 3.1. Introduction to Internet of Things 3.2. Throughput Maximization in DH-WPCN 3.2.1. Related Work 3.2.2. System Model 3.2.3. Throughput Maximization in Uplink and Downlink 3.2.4. Numerical Results 3.3. Fairness Enhancement in DH-WPCN 3.3.1. Related Work 3.3.2. System Model 3.3.3. Minimum Throughput Maximization 3.3.4. Numerical Results 3.4. Summary References 4. Future Directions for Wireless Powered Communications 4.1. New Application Trends in IoT and Telecommunications Networks 4.2. Future Research Directions References ukryj opis