公开(公告)号：US11923919B1

公开(公告)日：2024-03-05

申请号：US17952169

申请日：2022-09-23

Applicant: QUALCOMM Incorporated

Inventor： Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian

IPC: H04B7/0413 ,  H04B17/382 ,  H04B17/391

CPC classification number: H04B7/0413 ,  H04B17/382 ,  H04B17/3911

Abstract: Aspects of the present disclosure facilitate assessment of radio frequency (RF) exposure from a wireless device supporting multiple-input-multiple-output (MIMO) transmissions using multiple antennas. In certain aspects, MIMO RF exposure distributions for one or more MIMO transmissions are determined and stored in a memory. To assess RF exposure for a MIMO transmission, a processor may retrieve the corresponding MIMO RF exposure distributions from the memory, linearly combine the MIMO RF exposure distributions to obtain a combined MIMO RF exposure distribution, and assess RF exposure compliance based on the combined MIMO RF exposure distribution. In one example, the MIMO RF exposure distribution may include MIMO specific absorption rate (SAR) distributions.

公开(公告)号：US11917559B2

公开(公告)日：2024-02-27

申请号：US17412111

申请日：2021-08-25

Applicant: QUALCOMM Incorporated

Inventor： Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian ,  Troy Curtiss ,  Akhil Deodhar

IPC: H04W52/38 ,  H04B1/3827 ,  H04W52/36

CPC classification number: H04W52/38 ,  H04B1/3838 ,  H04W52/367

Abstract: Certain aspects of the present disclosure provide techniques for radio frequency (RF) exposure with antenna grouping. An example method for grouping antennas for RF exposure compliance by a processing system generally includes determining RF exposure distributions per transmit antenna configuration for a plurality of transmit antennas and assigning the plurality of transmit antennas to a plurality of antenna groups based on the RF exposure distributions.

公开(公告)号：US10595282B2

公开(公告)日：2020-03-17

申请号：US15797470

申请日：2017-10-30

Applicant: QUALCOMM Incorporated

Inventor： John Forrester ,  Paul A. Guckian ,  Lin Lu ,  Reza Shahidi ,  Amit Mahajan ,  Walid M. Hamdy ,  Francis M. Ngai

IPC: H04B1/04 ,  H04W52/30 ,  H04W52/28 ,  H04W52/22 ,  H04W52/42

Abstract: Certain aspects of the present disclosure propose methods for determining power level of one or more transmitters based on a power level of a primary transmitter when the transmitters are located in close proximity of each other. The power levels may be determined such that a combined power of all the transmitters is compliant with regulatory radio frequency (RF) safety requirements. For certain aspects, power level of the lower priority transmitters may be determined utilizing one or more look-up tables. For another aspect, power level of the lower priority transmitters may be calculated using an algorithm based on the power level of the priority transmitter. In aspects, the power level of lower priority transmitters and the time duration for which the transmitters are active may be selected dynamically so that the time averaged power of the transmitters for a defined period of time falls below the RF exposure limit.

公开(公告)号：US10511191B2

公开(公告)日：2019-12-17

申请号：US15094801

申请日：2016-04-08

Applicant: QUALCOMM Incorporated

Inventor： Zhe Zhang ,  Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian

IPC: H02J50/12 ,  H02J7/02 ,  H01F38/14 ,  H02J50/10

Abstract: Methods and apparatus are disclosed for wirelessly transmitting power. In one aspect, an apparatus for wireless transmitting power is provided. The apparatus comprises a first coil loop defining a first area, the first coil loop conducting current at a first current value for generating a first magnetic field. The apparatus further comprises a second coil loop surrounding the first coil loop and defining a second area, the second coil loop conducting current at a second current value generating a second magnetic field, wherein a ratio of the first current value to the first area is substantially equal to a ratio of the second current value to the second area.

公开(公告)号：US09900039B2

公开(公告)日：2018-02-20

申请号：US14723711

申请日：2015-05-28

Applicant: QUALCOMM Incorporated

Inventor： Shriram Ganesh ,  Babak Forutanpour ,  Lin Lu

IPC: H04W4/00 ,  G06F9/46 ,  H04B1/38 ,  H04B1/3827

CPC classification number: H04B1/3838 ,  G06F9/46 ,  H04W4/60

Abstract: Embodiments described herein provide a method for scheduling background processes. The method begins when a task scheduler requests a SAR severity level from the application processor. The application processor then requests the SAR severity level from the modem. Upon receipt of the SAR severity level the task scheduler then determines if the SAR severity level is high. If the SAR severity level is high, the task scheduler waits a predetermined time and then requests a further SAR severity level. This process continues until the SAR severity level returned in within a normal level. At that time, the background process is scheduled. This prioritizes transmission. The apparatus includes a task scheduler in communication with an application processor and a modem in communication with the application processor. The task scheduler may include a memory and a timer.

公开(公告)号：US20170012475A1

公开(公告)日：2017-01-12

申请号：US15094801

申请日：2016-04-08

Applicant: QUALCOMM Incorporated

Inventor： Zhe Zhang ,  Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian

IPC: H02J50/12 ,  H02J7/02 ,  H01F38/14

Abstract: Methods and apparatus are disclosed for wirelessly transmitting power. In one aspect, an apparatus for wireless transmitting power is provided. The apparatus comprises a first coil loop defining a first area, the first coil loop conducting current at a first current value for generating a first magnetic field. The apparatus further comprises a second coil loop surrounding the first coil loop and defining a second area, the second coil loop conducting current at a second current value generating a second magnetic field, wherein a ratio of the first current value to the first area is substantially equal to a ratio of the second current value to the second area.

Abstract translation: 公开了用于无线发射功率的方法和装置。 一方面，提供了一种用于无线发射功率的装置。 该装置包括限定第一区域的第一线圈环路，第一线圈环路以第一电流值传导电流以产生第一磁场。 所述装置还包括围绕所述第一线圈环并限定第二区域的第二线圈环路，所述第二线圈环路以第二电流值传导电流产生第二磁场，其中所述第一电流值与所述第一区域的比率基本上 等于第二电流值与第二区域的比率。

公开(公告)号：US20160174162A1

公开(公告)日：2016-06-16

申请号：US14572214

申请日：2014-12-16

Applicant: QUALCOMM Incorporated

Inventor： Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian

IPC: H04W52/18 ,  H04W24/02

CPC classification number: H04W52/18 ,  H04B1/3838 ,  H04B17/102 ,  H04W24/02 ,  H04W52/367

Abstract: A method and apparatus for determining transmit power limits for multiple transmitter devices is provided. The method begins when a two-dimensional area scan and a localized three-dimensional volume scan are performed for each transmitter and antenna. These two-dimensional area scans are converted to a three-dimensional full volume data using analytical estimations to determine the peak averaged SAR value, and subsequently determining the error associated with the analytical estimation. The error associated with the analytical estimation is determined by comparison with the measured value. The combined peak averaged SAR may then be determined for simultaneous transmissions of multiple transmitters with varying transmit powers by combining the scaled and analytically determined three-dimensional full volume data for each transmitter. The value is then further scaled by the worst-case conversion error for all active transmitters. This value is compared with the SAR limit and the maximum allowable transmit power determined for the multiple transmitters.

Abstract translation: 提供了一种用于确定多个发射机设备的发射功率限制的方法和装置。 当对每个发射器和天线执行二维区域扫描和局部三维体积扫描时，该方法开始。 使用分析估计将这些二维区域扫描转换为三维全体积数据，以确定峰值平均SAR值，随后确定与分析估计相关的误差。 通过与测量值的比较来确定与分析估计相关的误差。 然后可以通过组合每个发射机的缩放和分析确定的三维全体积数据来确定组合峰值平均SAR，以同时传输具有变化的发射功率的多个发射机。 然后，所有有源发射机的最坏情况转换误差进一步减小该值。 该值与SAR限制和为多个发射机确定的最大允许发射功率进行比较。

公开(公告)号：US20140273819A1

公开(公告)日：2014-09-18

申请号：US13801328

申请日：2013-03-13

Applicant: QUALCOMM INCORPORATED

Inventor： Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian

IPC: H04B17/00

CPC classification number: H04B17/10 ,  H04B1/3838 ,  H04B5/0025 ,  H04B5/0043 ,  H04B17/102

Abstract: Efficient techniques for estimating specific absorption rate (SAR) for wireless devices. In an aspect, electric and/or magnetic field measurements are made over a two-dimensional (2D) surface in the proximity of a wireless device. The field measurements are used to generate a near-field equivalent source representation of the wireless device. Specific absorption rate over, e.g., a 1 g/10 g mass may then be calculated by performing electromagnetic simulations using the near-field equivalent source representation. In an aspect, an elementary dipole array may be used to generate the near-field equivalent source representation from the field measurements.

Abstract translation: 用于估计无线设备的特定吸收率（SAR）的高效技术。 在一个方面，在无线设备附近的二维（2D）表面上进行电场和/或磁场测量。 场测量用于生成无线设备的近场等效源表示。 然后可以通过使用近场等效源表示进行电磁模拟来计算例如1g / 10g质量的比吸收率。 在一方面，可以使用基本偶极阵列来从场测量生成近场等效源表示。

公开(公告)号：US12213080B2

公开(公告)日：2025-01-28

申请号：US18487557

申请日：2023-10-16

Applicant: QUALCOMM Incorporated

Inventor： Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian ,  Mingming Cai ,  Junsheng Han ,  Udara Fernando ,  Raghu Challa

IPC: H04W52/12 ,  H04B1/3827 ,  H04W52/22

Abstract: In certain aspects, a method implemented in a wireless device includes determining a specific absorption rate (SAR) distribution for a first wireless communication technology, determining a power density (PD) distribution for a second wireless communication technology, and combining the SAR distribution and the PD distribution to generate a combined RF exposure distribution. The method also includes determining at least one first maximum allowable power level and at least one second maximum allowable power level for a future time slot based on the combined RF exposure distribution, setting at least one transmission power limit for a first transmitter in the future time slot based on the at least one first maximum allowable power level, and setting at least one transmission power limit for a second transmitter in the future time slot based on the at least one second maximum allowable power level.

公开(公告)号：US12177797B2

公开(公告)日：2024-12-24

申请号：US17412143

申请日：2021-08-25

Applicant: QUALCOMM Incorporated

Inventor： Jagadish Nadakuduti ,  Lin Lu ,  Paul Guckian ,  Troy Curtiss ,  Akhil Deodhar

IPC: H04W52/38 ,  H04B1/3827 ,  H04W52/22

Abstract: Certain aspects of the present disclosure provide techniques for operating a wireless communication device pursuant to radio frequency (RF) exposure with antenna grouping. An example method of wireless communication by a user equipment generally includes accessing a stored backoff factor associated with an antenna group among a plurality of antenna groups. The method also includes transmitting, from at least one transmit antenna in the antenna group, a signal at a transmission power level based on the backoff factor in compliance with an RF exposure requirement.