Digital Predistortion for Concurrent Dual-band Millimeter Wave Analog Multibeam Transmitters
并行双频毫米波模拟多波束发射机的数字预失真
同時デュアルバンドミリ波アナログマルチビーム送信機用のディジタルプリディストーション
병렬 이중 주파수 밀리미터 파 시 뮬 레이 션 다 중 빔 송신기 의 디지털 예비 일 그 러 짐
Predistoración digital del transmisor analógico multihaz de onda milimétrica de doble frecuencia paralela
Pré - distorsion numérique d'un émetteur multifaisceaux analogique à ondes millimétriques à double fréquence parallèle
цифровое предварительное искажение аналогового многолучевого передатчика с параллельными двухчастотными миллиметровыми волнами
IEEE Transactions on Circuits and Systems II: Express Briefs, 16 August 2021
Abstract
This brief proposes a novel digital predistortion (DPD) technique to linearize concurrent dual-band millimeter wave (mmWave) analog multibeam transmitters. Beams at the same frequency band give full play to the spatial multiplexing, so as to improve spectrum utilization. By means of detailed analysis of the system characteristics, a DPD model is proposed to effectively eliminate the distortions caused by power amplifiers (PAs) including nonlinearity, memory effect, the intermodulation distortion (IMD) between two different frequency bands, and the multibeam interference incurred in undesirable sidelobes in the main beam direction simultaneously.
To validate the proposed idea, a test bench of mmWave analog multibeam transmitter utilizing Butler matrix was designed, and then it was stimulated by a concurrent dual-band signal at 26.91 GHz and 27.09 GHz, respectively. Compared with existing DPD techniques, the proposed method is suitable for compensating the distortions in dual-band analog multibeam transmitters, which has shown its great potential for the applications in future mmWave concurrent dual-band multibeam wireless communication systems.
