Full Duplex MIMO Radios

Engineers in Prof. Sachin Katti's laboratory have developed a 3 X 3 in-band full duplex MIMO radio, that can simultaneously transmit and receive on the same channel using standard WiFi 802.11n PHY for 20 Mhz bandwidth. This technology uses a single antenna for each MIMO stream to achieve close to the theoretical doubling of throughput in all practical deployment scenarios. This invention builds on the interdisciplinary SISO self-cancellation technology (described in Stanford Docket S13-277) with a scalable design that neutralizes cross-talk between the different antennas and also cancels non-linear distortion.

Stage of Research
Prototype – The inventors built analog circuit boards and integrated them with a off-the-shelf, fully WiFi-PHY compatible WARP software radio implementation. They demonstrated robust performance (leaves 1 dB of self-interference) in noisy indoor environments with close to the expected theoretical doubling of throughput.