Full-duplex MIMO coming to next-generation networks

Qualcomm demonstrated full-duplex MIMO as part of their next-generation cellular offerings; see news release. Novel scalable full-duplex MIMO techniques, especially for antenna arrays with large number of antennas like those in Massive MIMO antenna arrays for 5G networks, were proposed by Sabharwal and his team in a sequence of papers; see SoftNull and JointNull. The papers showed that massive MIMO has sufficient degrees of freedom to enable MIMO full-duplex without adding new analog hardware to existing systems that are not designed for in-band full-duplex systems. The papers used channels measurements using Rice Argos massive MIMO testbed that was built using Rice WARP.