In Your Own Words with David Cruickshank

When Artech House authors write their books, we ask them what they want their readers to get out of the project. In this series, we show you what our authors, in their own words, wish to impart upon readers. David Cruickshank, author of Implementing Full Duplexing for 5G, describes what his book is about:

Examines effects of full duplexing on cellular communication

The book looks at the potential effect of full duplexing on the major platforms of cellular communication- base station, relay, access point and mobile phone, in terms of their constituent hardware. Full duplexing effectively doubles the spectral utilization of existing communication bands and is potentially one method of increasing capacity as 5G data demand rises in the future. The focus is on the RF hardware, that is the transceiver and antenna components, and how it can be adapted to solve the self-interference problem in full duplexing. This includes looking at methods of separating transmit and receive signals using separate antennas, dual polarization of single antennas, and duplexing circulators, but also discusses the relative merits and allocation of analog and digital self-interference mitigation techniques.

Explores new methods of duplexing

Relatively new methods of duplexing are discussed, including non-magnetic spatio-temporal modulation to replicate magnetic circulation, electrical balance duplexers, and a review of progress in magnetic circulators, where significant improvements in size, cost and ease of integration have occurred, using different transmission line approaches such as substrate integrated waveguide. The book will attempt to assign the best application of each method by both platform and frequency.

Considers feasibility of simultaneous transmission and receiving of signals at the same frequency

The book considers the feasibility of using a method of doubling the capacity of cellular networks by simultaneously transmitting and receiving signals at the same frequency, a process known as full duplexing. Currently, the transmitted and received signals are at different frequencies, using more of the scarce available frequency band, or they are separated in time, using additional time and therefore capacity. To realize full duplexing, changes in the hardware of the cell- base stations, relaying equipment, “hot spot” access points and mobile phones are necessary to prevent the hardware’s transmitters from interfering with their own receivers. This requires looking at how to separate the strong transmitted signal from the very weak received signal, a process requiring both hardware (analog) changes and more complex digital signal processing. Different ways of achieving that goal are examined. The hardware changes involve new duplexing components that may be different depending on the frequency band and cell hardware being used, and the book reviews the relative merits of each.

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