This paper presents the design and implementation of the first in-band full duplex WiFi radios that can simultaneously transmit and receive on the same channel using standard WiFi 802.11ac PHYs and achieves close to the theoretical doubling of throughput in all practical deployment scenarios. Full duplex, if possible, has tremendous implications for network design, not least of which is the fact that cellular networks could cut their spectrum needs by half. With an in-band full-duplex system we could use a single channel to get the same performance.

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