Practical insights on full-duplex personal wireless communications gained from operational experience in the satellite environment

Full-duplex communications for personal communications wireless links, wherein both ends of a link can transmit and receive continuously on the same frequency, is of considerable commercial interest, inspiring a good deal of theoretical and practical study. A part of most proposed schemes is a digital stage capable of substantially reducing self-interference induced by the two transmitters. For some ten years now a technique for doing this has been in commercial use for satellite communications. This paper examines that technique and uses it to guide current research and to estimate the performance that might be practically achieved.