公开(公告)号：US09867144B2

公开(公告)日：2018-01-09

申请号：US15422333

申请日：2017-02-01

Applicant: QUALCOMM Incorporated

Inventor： Ziv Golan

IPC: H04B7/00 ,  H04W52/24 ,  H04W52/52 ,  H04B1/00 ,  H04B17/13 ,  H04B17/14 ,  H04B1/04

CPC classification number: H04W52/248 ,  H03F1/02 ,  H03F3/24 ,  H04B1/0064 ,  H04B17/13 ,  H04B17/14 ,  H04B2001/045 ,  H04W52/52

Abstract: Certain aspects relate to methods and apparatus for calibrating transmit error vector magnitude (EVM) using an over-the-air loopback mechanism. An apparatus includes a first radio frequency (RF) module configured to generate first RF signals based on first intermediate frequency (IF) signals and to output the first RF signals via at least a first antenna element, a second RF module configured to process the first RF signals, as obtained via a second antenna element, and to generate second IF signals, and a baseband module configured to determine a transmit performance metric for the first RF module based on the first IF signals and the second IF signals, determine a first transmit power level based on the determined transmit performance metric, and cause the first RF module to output second RF via the first antenna element at the first transmit power level.

公开(公告)号：US10659188B2

公开(公告)日：2020-05-19

申请号：US16039718

申请日：2018-07-19

Applicant: QUALCOMM Incorporated

Inventor： Amir Dabbagh ,  Reuven Alpert ,  Ziv Golan ,  Hezi Hezkiyahu

IPC: H04L1/00 ,  H04L1/20 ,  H04B17/336 ,  H04B7/0413 ,  H04B7/06 ,  H04L5/00 ,  H04L12/26

Abstract: Techniques and apparatus for efficiently performing rate selection and transmit gain selection are provided. The techniques may be performed, for example, by a transmitting entity in the absence of explicit MCS selection reporting by a receiving entity. One technique includes outputting first packets for transmission using a first modulation and coding scheme (MCS) value and via a transmit power amplifier (PA) configured according to a transmit gain parameter associated with the first MCS value. Feedback indicating whether the first packets have been received is obtained, a second MCS value for second packets is selected based on the feedback, and the transmit gain parameter is adjusted if one or more criteria are met. Second packets are output for transmission using the second MCS value and, thereafter, additional packets are output for transmission based on the first MCS value and the adjusted transmit gain parameter.