David B Cruickshank 
Implementing Full Duplexing for 5G [PDF ebook] 

This book examines the current state of the art in developing full duplex (FD) systems in 5G LTE cellular communications. The book also considers what can be achieved with ferrite-based circulators in terms of size reduction and performance enhancement, especially at millimetric frequencies. The relative merits of ferrite and non-ferrite circulators are compared in terms of their fundamental materials and device technologies, such as isolation, insertion loss, bandwidth and non-linearity. FD in the entire 5G cell is also examined and its resulting range of equipment and device communication. This includes front-hauling, more sophisticated back and front-hauling, backhaul beam switching, and cell extenders and relays, all of which could involve FD.