公开(公告)号：US20250007544A1

公开(公告)日：2025-01-02

申请号：US18444385

申请日：2024-02-16

Applicant: Samsung Electronics Co., Ltd.

Inventor： Caleb K. Lo ,  Joonyoung Cho ,  Jianzhong Zhang ,  Chance Anthony Tarver

IPC: H04B1/04 ,  H04L27/04

Abstract: Methods and apparatuses for dynamically adjusting parameters of a modulation scheme and parameters of a digital pre-distorter (DPD) to pre-compensate for distortion effects of a power amplifier (PA). A user equipment (UE) comprises a modulator configured to generate modulation symbols from input bits according to an adjusted symbol constellation, a DPD operably configured to generate pre-distorted symbols, and a PA configured to amplify the pre-distorted symbols to generate transmission symbols that include distortion effects of the PA. The adjusted symbol constellation is adjusted from a target symbol constellation such that the generated modulation symbols pre-compensate for the distortion effects. The DPD is further configured to generate the pre-distorted symbols from the modulation symbols using a pre-distortion function to further pre-compensate for the distortion effects, and update the pre-distortion function such that a difference between the transmission symbols and a scaled version of the target symbol constellation is reduced.

公开(公告)号：US20240333361A1

公开(公告)日：2024-10-03

申请号：US18419358

申请日：2024-01-22

Applicant: Samsung Electronics Co., Ltd.

Inventor： Chance Anthony Tarver ,  Gang Xu ,  Shadi Abu-Surra ,  Won Suk Choi ,  Young Han Nam ,  Jianzhong Zhang

IPC: H04B7/06 ,  H04B7/0426 ,  H04B17/12 ,  H04B17/21

CPC classification number: H04B7/0686 ,  H04B7/043 ,  H04B17/12 ,  H04B17/221

Abstract: A hybrid MIMO system comprises N digital transceiver chains and N analog beamformers, each coupled to one of the digital transceiver chains and comprising M analog transmitter (TX) chains and M analog receiver (RX) chains. One of the analog RX chains is an RX reference node and one of the analog TX chains is a TX reference node. A processor is coupled to a calibration transceiver, the transceiver chains, and the beamformers. For each beamformer the processor measures, using the corresponding transceiver chain and the calibration transceiver, TX and RX phase responses and TX and RX magnitude responses of the TX and RX reference nodes, respectively, determines a reciprocity calibration based on a phase difference between the TX and RX phase responses and a magnitude difference between the TX and RX magnitude responses, and applies the reciprocity calibration to stored beam definitions to correct for the phase and magnitude differences.