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This letter develops a novel transmit beamforming (BF) design for cancelingself-interference (SI) in analog in-band full-duplex phased arrays. Our designmaximizes transmit BF gain in a desired direction while simultaneously reducingSI power to below a specified threshold on per-antenna basis to avoidsaturating receive-chain components, such as LNAs. Core to our approach is thatit accounts for real-world phase shifters used in analog phased array systems,whose limited resolution imposes non-convex constraints on BF design. Weovercome this by transforming these non-convex constraints into convex polygonconstraints, which we then solve through semidefinite relaxation and a rankrefinement procedure. Numerical results show that our proposed BF schemereliably cancels SI to the target power threshold at each receive antenna whilesacrificing little in transmit BF gain, even with modest phase shifterresolution.

Analog Beamforming for In-Band Full-Duplex Phased Arrays with Quantized Phase Shifters under a Per-Antenna Received Power Constraint