4. Wireless Data Telemetry

This chapter focuses on efficient energy management and reliable data telemetry techniques in inductive link-based WPDT systems. Compared to far-field data communication, near-field data telemetry offers lower power consumption and simpler circuit designs, making it suitable for compact wireless applications. This chapter categorizes and explains data telemetry systems based on downlink, uplink, and bidirectional transmission methods. It introduces various modulation techniques such as single-carrier, multi-carrier, pulse-based, and harmonic-based, discussing the characteristics of each. Optimized WPDT systems require a balance of multiple factors, including data transmission rate, communication distance, robustness against link variations, and energy efficiency. Achieving reliable data telemetry in applications with power and size constraints is a significant challenge. To address this, recent WPDT systems focus on integrating a power supply with bidirectional data telemetry through inductive links. These systems efficiently combine power and data transfer to minimize additional components and power consumption while supporting simultaneous downlink and uplink data streams in various wireless applications. Therefore, designers must carefully select the most appropriate data telemetry system, considering the practical limitations of the application and available resources such as power consumption, physical area, data rate, reliability, and communication distance.