Widely-linear beamforming and RF impairment suppression in massive antenna arrays
作者： Aki Hakkarainen , Janis Werner , Kapil R. Dandekar , Mikko Valkama
关键词: Electronic engineering 、 Beamforming 、 RF front end 、 Antenna measurement 、 Microstrip antenna 、 Reconfigurable antenna 、 Computer science 、 Antenna (radio) 、 Antenna array 、 Telecommunications 、 Smart antenna
摘要: In this paper, the sensitivity of massive antenna arrays and digital beamforming to radio frequency (RF) chain in-phase quadrature-phase (I/Q) imbalance is studied analyzed. The analysis shows that are increasingly sensitive such RF imperfections, corrupting heavily radiation pattern capabilities. Motivated by this, novel RF-aware methods then developed for automatically suppressing unwanted effects I/Q without separate calibration loops in all individual receiver branches. More specifically, paper covers closed-form signal processing properties as well associated under both systematic random imbalances. All derivations assume ideal signals be circular. well-known minimum variance distortionless response (MVDR) beamformer a widely-linear (WL) extension it, called WL-MVDR, analyzed detail from imperfection perspective, terms interference attenuation beamsteering. optimum WL-MVDR solution formulated shown efficiently suppress imperfections. Based on obtained results, solutions particular method can provide efficient beamsteering characteristics, despite imperfections circuits. This seen critical especially array context where cost-efficiency chains emphasized.
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