Integrated Self-Interference Cancelers for Fully-Duplex Radios

The ever-increasing demand for data in today’s society has driven the rapid evolution of wireless technologies to enhance network capacity. While 5G deployments have made significant advances through innovations like massive multiple-input multiple-output (MIMO) and mm-wave bands, current wireless systems operate predominantly in half-duplex (HD) mode. Full-duplex (FD) wireless communication, by contrast, allows simultaneous transmission and reception (STAR) of signals on the same frequency, unlocking benefits such as greater spectral efficiency, higher data-rates, and lower latency. This talk provides a comprehensive review of FD wireless systems, emphasizing hardware design, implementation, cross-layer considerations, and applications. It begins by establishing a system-level understanding of FD wireless networks and the requirements for effective Self-Interference Cancellation (SIC) in real-world scenarios. Next, we delve into the characteristics of self-interference (SI) and the design of time-domain and frequency-domain cancelers. The discussion includes detailed insights into state-of-the-art integrated RF and baseband (BB) SI cancellers. Finally, we explore the relevance of FD systems in applications such as next-generation (xG) wireless networks, mm-wave repeaters, radars, and emerging non-communication use cases.