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Noteworthy strides continue to be made in the development of full-duplexmillimeter wave (mmWave) communication systems, but most of this progress hasbeen built on theoretical models and validated through simulation. In thiswork, we conduct a long overdue real-world evaluation of full-duplex mmWavesystems using off-the-shelf 60 GHz phased arrays. Using an experimentalfull-duplex base station, we collect over 200,000 measurements ofself-interference by electronically sweeping its transmit and receive beamsacross a dense spatial profile, shedding light on the effects of theenvironment, array positioning, and beam steering direction. We then callattention to five key challenges faced by practical full-duplex mmWave systemsand, with these in mind, propose a general framework for beamforming-basedfull-duplex solutions. Guided by this framework, we introduce a novel solutioncalled STEER+, a more robust version of recent work called STEER, andexperimentally evaluate both in a real-world setting with actual downlink anduplink users. Rather than purely minimize self-interference as with STEER,STEER+ makes use of additional measurements to maximize spectral efficiency,which proves to make it much less sensitive to one's choice of designparameters. We experimentally show that STEER+ can reliably reduceself-interference to near or below the noise floor while maintaining high SNRon the downlink and uplink, thus enabling full-duplex operation purely viabeamforming.

Real-World Evaluation of Full-Duplex Millimeter Wave Communication Systems