This letter proposes a millimeter-wave (mm-wave) RF beamforming transmitter (TX) architecture that employs frequency multipliers (FMs) as frequency up-converters to avoid the challenges associated with the signal and local oscillator (LO) distribution networks that intensify with the increase of operating frequency. The proposed architecture incorporates a single-input– single-output (SISO) digital predistortion (DPD) scheme that is specifically devised to mitigate the nonlinear distortions exhibited by the cascade of FMs and power amplifiers (PAs). Proof-of-concept experiments conducted on a lineup, comprised of an off-the-shelf frequency doubler and an 8×88\times 8 array and operating at an output frequency of 28 GHz, confirmed the capacity of the proposed architecture to transmit 200 MHz orthogonal frequency division multiplexing (OFDM) signals with an error vector magnitude (EVM) and adjacent channel power ratio (ACPR) better than 1.6% and 45 dB, respectively, while achieving an effective isotropic radiated power (EIRP) of 46.3 dBm.

中文翻译：

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采用基于倍频器的上变频器的毫米波射频波束成形发射机架构的概念验证


这封信提出了一种毫米波 (mm-wave) RF 波束成形发射机 (TX) 架构，该架构采用倍频器 (FM) 作为上变频器，以避免与信号和本地振荡器 (LO) 分配网络相关的挑战，这些挑战随着工作频率的增加。所提出的架构采用了单输入单输出 (SISO) 数字预失真 (DPD) 方案，该方案是专门为减轻 FM 和功率放大器 (PA) 级联所表现出的非线性失真而设计的。对由现成的倍频器和 8×88×8 阵列组成并在 28 GHz 输出频率下运行的产品线进行的概念验证实验证实了所提出的架构能够传输 200 MHz 正交频分复用 (OFDM) 信号的误差矢量幅度 (EVM) 和邻道功率比 (ACPR) 分别优于 1.6% 和 45 dB，同时实现 46.3 dBm 的有效全向辐射功率 (EIRP)。