- Ashutosh Sabharwal, Rice University, USA
- Besma Smida, University of Illinois at Chicago, USA
A fundamental assumption in wireless network design is that radios cannot simultaneously transmit and receive in the same spectrum. This assumption manifests itself in the design of all networks. For example, cellular networks (3G, 4G, 5G,…) slice the spectrum to use part for transmission and the other parts for reception – this is called frequency-division duplex. Similarly, WiFi uses time-division duplex, by either transmitting or receiving in the same band. In 2010, it was experimentally demonstrated that in-band full-duplex is practically possible. The demonstration gained significant attention from both academic and companies. In 2015, full-duplex was first adopted by cable modem industry into DOCSIS 4.0 which makes next-generation cable modems full-duplex. By 2020, full- duplex wireless products have started to appear in 5G systems. Thus, in one decade, the idea has gone from laboratory to telecommunications standards and products.
This past decade of high activity has produced some very fundamental knowledge on full-duplex wireless. The special section will provide an extensive review of different aspects of full-duplex review. It will be organized in the layers of full-duplex network design – (i) low-level circuit approaches, (ii) signal-space approaches or equivalently physical layer approaches, (iii) network design, and (iv) large-scale deployed network design and tradeoffs.