Long Chen

TL;DR: A beam-oriented digital predistortion (BO-DPD) technique for power amplifiers (PAs) in hybrid beamforming massive multiple-input multiple-output (MIMO) transmitters, which can achieve linearization of the transmitted signal in the main beam direction and address the DPD implementation issue in the hybridbeamforming array.

TL;DR: A modified beam-oriented digital predistortion utilizing the over-the-air diversity feedbacks (OTA DFBs) is proposed for linearizing the hybrid beamforming (HBF) large-scale array and better than 15-dB adjacent channel power ratio (ACPR) improvement has been realized with the proposed DPD.

TL;DR: A power scalable beam-oriented digital predistortion (PSBO-DPD) architecture suitable for linearizing PAs in compact hybrid massive multiple-input multiple-output (MIMO) transmitters, without the need to implement a dedicated observation path for each PA is proposed.

TL;DR: A uniform complex-valued Hilbert transform-based polynomial (HTBP) function is proposed for the modeling of the harmonics, as well as the fundamental component in the real-valued input and output signals.

TL;DR: Experimental results validate that the proposed HHC-DPD scheme with the FLC outperforms current harmonic cancellation approaches and the non-convergence issue in iterations can be avoided.