In this letter, a novel multibeam digital predistortion (MB-DPD) technique is proposed to linearize multiple beams simultaneously targeted at the multiuser scenario of millimeter-wave (mmWave) analog beamforming transmitters. It is achieved by effectively constructing the predistorted signal for each beam to remove both the intrinsic nonlinear distortion of power amplifier (PA) and the multibeam interference incurred by all beams except the targeted main beam. To validate the proposed technique, a two-beam test on an analog beamforming transmitter was carried out and the measurement results have shown that the proposed method can effectively realize the multibeam linearization, providing a promising solution for mmWave multiuser applications.

中文翻译：

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毫米波模拟波束成形发射机的多波束数字预失真

在这封信中，提出了一种新颖的多波束数字预失真 (MB-DPD) 技术，以针对毫米波 (mmWave) 模拟波束成形发射机的多用户场景同时线性化多个波束。它是通过有效地构建每个波束的预失真信号来消除功率放大器（PA）固有的非线性失真和除目标主波束之外的所有波束产生的多波束干扰来实现的。为了验证所提出的技术，在模拟波束成形发射机上进行了两波束测试，测量结果表明所提出的方法可以有效地实现多波束线性化，为毫米波多用户应用提供了一种很有前景的解决方案。