WMM: Recent Advances in Full-Duplex Techniques for Wireless Communication and Sensing Systems

Presentation Abstract
The rapid evolution of wireless communication and sensing systems necessitates continuous innovation to meet the increasing demand for higher data-rates, improved spectrum efficiency, and reduced latency. One promising technique to address these challenges is the In-Band Full-Duplex (IBFD), also known as Simultaneous Transmit And Receive (STAR) technology. IBFD enables a device to simultaneously transmit and receive on the same frequency at the same time. The benefits of this technology include a doubling of the capacity, higher spectral efficiency, reduced latency, a higher data-rate, optimized network performance, and improved sensing systems. In this workshop, several experts will present various approaches to cancel the inherent self-interference from the own transmitter. It begins by explaining the three domains where self-interference can be mitigated: propagation, analog, and digital domain. The current challenges and recent research advances are elucidated, and the presentations are organized in accordance with the overarching themes of the workshop. One presentation is dedicated to the analysis of digital self-interference phenomena occurring in different modulation formats within the VHF band. The presentation compares and contrasts the characteristics of analog (AM, FM, PM) and digital (OFDM) formats. Another presentation addresses IBFD phased array systems, with a focus on self-interference suppression techniques, including RF cancellation, adaptive beamforming, and digital filtering, and their potential for application in 6G systems. A subsequent presentation will examine the utilisation of full-duplex FMCW radar systems, with a particular focus on the deployment of active Self-Interference Cancellation Couplers (SICCs) to enhance radar system isolation and facilitate miniaturisation and over-the-air synchronisation. Additional presentations address self-interference cancellation in Advanced Duplex (AD) systems, with an emphasis on techniques within MIMO communication and adaptive RF front-ends, which are of particular importance for IBFD and FDD, employing tunable filters and electrical balance duplexers. Furthermore, the workshop examines the potential of Gallium Nitride (GaN) technology in the development of fully integrated transceiver front-ends for applications such as radar and electronic warfare. In this context, the material’s advantages in terms of power, size, and radiation tolerance, particularly for space systems, are emphasised. Additionally, the discussion encompasses a range of GaN designs, including power amplifiers and low-noise amplifiers, along with their associated testing and measurement processes.