Combined Sidelobe Reduction and Omnidirectional Linearization of Phased Array by Using Tapered Power Amplifier Biasing and Digital Predistortion
نویسندگان
چکیده
Power amplifier (PA) efficiency and linearity are among the key drivers to reduce energy consumption while enabling high data rates in fifth-generation (5G) millimeter-wave phased array transmitters. Analog per-branch phase amplitude control is used steer beam, suppress sidelobes, form zeros desired spatial directions. The of individual PA inputs makes nonlinearity vary from antenna antenna, which challenges common digital predistortion (DPD) linearize array. In this article, we implement an for beamforming by tuning gate bias. Varying output powers via biasing nonlinear characteristics observed at outputs similar that helps DPD also PAs. technique validated both simulations measurements. As a measurement platform, use 28-GHz transceiver equipped with 64 elements 16 radio frequency chains. beam shape synthesized controlling per-antenna over-the-air-power Then, system linearized training reference antenna. demonstrated 100-MHz-wide 5G new modulated waveform. best example case showed −23.5-dB maximum sidelobe level (SLL) 4.9% error vector magnitude −40.8-dB total radiated adjacent channel power ratio DPD. proposed approach enables simultaneous reduction pattern SLL, achieves good all directions, maintains efficiency.
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ژورنال
عنوان ژورنال: IEEE Transactions on Microwave Theory and Techniques
سال: 2021
ISSN: ['1557-9670', '0018-9480']
DOI: https://doi.org/10.1109/tmtt.2021.3092357