公开(公告)号：US20190052484A1

公开(公告)日：2019-02-14

申请号：US16152998

申请日：2018-10-05

Applicant: QUALCOMM Incorporated

Inventor： Erik David LINDSKOG ,  Ning ZHANG ,  Naveen Kumar KAKANI ,  Alireza RAISSINIA ,  Xiaoxin ZHANG

IPC: H04L25/02 ,  H04L29/06 ,  H04W12/12

Abstract: Generally, the described techniques provide for protection mechanisms for sounding training signals transmitted between wireless devices when performing ranging sounding estimation. For example, sounding training signals may be encoded to include a sequence of phase rotations or cyclic shifts to protect the sounding training signal from peer devices. In some cases, encoding information associated with a long training field (LTF) may be transmitted either before or after the LTF is transmitted. Additionally or alternatively, a time delay may be introduced to the sounding training signal, where timing information may be removed from one or more fields of the sounding training signal and the time delay may be appended to an interframe spacing. Alternatively, a frame may be split into multiple frames with the sounding training signal in a first frame, and timing information in a second frame that is offset in time from the first frame.

公开(公告)号：US20170280439A1

公开(公告)日：2017-09-28

申请号：US15466167

申请日：2017-03-22

Applicant: QUALCOMM Incorporated

Inventor： Ning ZHANG ,  Xiaoxin Zhang ,  Kai Shi

IPC: H04W72/04 ,  H04W24/02 ,  H04L5/00

CPC classification number: H04W72/0413 ,  H04L5/0007 ,  H04L5/0055 ,  H04L25/0216 ,  H04L27/2607 ,  H04W24/02

Abstract: This disclosure provides systems, methods and apparatuses for selecting a guard interval for transmission of orthogonal frequency-division multiplexing (OFDM) symbols on an uplink (UL) channel and on a downlink (DL) channel. In some implementations, a transmitting device and a receiving device can estimate channel delay spread (CDS) information for each other's transmit channels, exchange the estimated CDS information with each other, and select a guard interval based on the estimated CDS information exchanged with each other. The transmitting device can transmit a number of OFDM symbols separated by the selected guard interval to the receiving device on the UL channel, and the receiving device can transmit a number of OFDM symbols separated by the selected guard interval to the transmitting device on the DL channel.

公开(公告)号：US20140254511A1

公开(公告)日：2014-09-11

申请号：US14185660

申请日：2014-02-20

Applicant: Qualcomm Incorporated

Inventor： Carlos Horacio ALDANA ,  Ning ZHANG

IPC: H04W56/00

CPC classification number: H04W56/0035 ,  H04W40/244 ,  H04W56/003 ,  H04W88/08

Abstract: Systems and methods for calculating round trip time (RTT) between two wireless devices with respective clock drifts, while lowering the impact of the clock drifts on the RTT. A first RTT in a first direction is determined between a first wireless device and a second wireless device based on a first set of one or more messages exchanged between the first wireless device and the second wireless device. A second RTT in a second direction is determined between the second wireless device and the first wireless device based on a second set of one or more messages exchanged between the second wireless device and the first wireless device, and an average RTT of the first RTT and the second RTT is computed, wherein the average RTT has a low impact of the clock drifts.

Abstract translation: 在具有相应时钟漂移的两个无线设备之间计算往返时间（RTT）的系统和方法，同时降低时钟漂移对RTT的影响。 基于在第一无线设备和第二无线设备之间交换的一个或多个消息的第一组，在第一无线设备和第二无线设备之间确定第一方向上的第一RTT。 基于在第二无线设备和第一无线设备之间交换的一个或多个消息的第二组以及第一RTT的平均RTT和第二无线设备的平均RTT，在第二无线设备和第一无线设备之间确定第二RTT， 计算第二RTT，其中平均RTT对时钟漂移的影响较小。

公开(公告)号：US20190271774A1

公开(公告)日：2019-09-05

申请号：US15909830

申请日：2018-03-01

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxin ZHANG ,  Youngsin LEE ,  Ning ZHANG

IPC: G01S13/56 ,  H04L25/02

Abstract: Method, apparatus and systems for detecting motion of an object or person have been disclosed. The method and the accompanying apparatus for motion detection include determining a plurality of channel impulse response (CIR) power profiles over a plurality of time sampling taps of one or more received signals, time aligning the plurality of the CIR power profiles based on time sampling taps of one or more occurrences of peak CIR power levels being above a threshold in each of the plurality of the CIR power profiles for generating a reference CIR power profile, and detecting motion based on a comparison of the reference CIR power profile to a captured signal CIR power profile. The detecting motion may be based on a coarse motion detection process, and followed by a fine motion detection process if a correlation degree threshold is below a level in the coarse motion detection process.

公开(公告)号：US20190058545A1

公开(公告)日：2019-02-21

申请号：US16058301

申请日：2018-08-08

Applicant: QUALCOMM Incorporated

Inventor： Jialing Li CHEN ,  Lin YANG ,  Bin TIAN ,  Ning ZHANG ,  Vincent Knowles JONES, IV ,  Didier Johannes Richard VAN NEE ,  Louay JALLOUL ,  Ahmad Abdulrahman MOHAMMED

IPC: H04L1/00 ,  H04W52/02

Abstract: Apparatuses and methods for correcting a distorted signal at a receiver device during wireless local area network (WLAN) communications are disclosed. The apparatuses and methods include receiving, by a receiver device in a WLAN, a distorted signal corresponding to a data packet signal transmitted from a transmitter device, receiving, by the receiver device, one or more transmitter parameters corresponding to the transmission of the data packet signal, the one or more transmitter parameters including information to adjust the distorted signal, and adjusting, by the receiver device, the distorted signal to reconstruct the data packet signal based at least on the one or more transmitter parameters.

公开(公告)号：US20180351620A1

公开(公告)日：2018-12-06

申请号：US15629356

申请日：2017-06-21

Applicant: QUALCOMM Incorporated

Inventor： Chi-Lin SU ,  Youhan KIM ,  Ning ZHANG

IPC: H04B7/06 ,  H04B7/0417

CPC classification number: H04B7/0626 ,  H04B7/0695

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for combining channel feedback obtained for multiple soundings and transmitting beamformed communications based on the combined channel feedback. In one aspect, a method includes transmitting, by a first wireless device, a first channel sounding using a first subset of antennas, receiving first channel feedback from a second wireless device based on the first channel sounding, transmitting a second channel sounding using a second subset of the antennas that partially overlaps with the first subset, receiving second channel feedback based on the second channel sounding, and transmitting a beamformed communication to the second wireless device based on the first and the second channel feedback.

公开(公告)号：US20180063742A1

公开(公告)日：2018-03-01

申请号：US15247335

申请日：2016-08-25

Applicant: QUALCOMM Incorporated

Inventor： Zhanfeng JIA ,  Ning ZHANG ,  Simon BRAND

IPC: H04W28/02 ,  H04L12/26 ,  H04W4/02

CPC classification number: H04W28/0231 ,  H04L43/0882 ,  H04L43/16 ,  H04W4/023 ,  H04W52/0258 ,  H04W52/028 ,  H04W84/12 ,  H04W88/08 ,  Y02D70/00 ,  Y02D70/10 ,  Y02D70/14 ,  Y02D70/142

Abstract: Systems and methods for wireless communications are disclosed, such as an apparatus for wireless communications. The apparatus generally includes an interface for communicating with a plurality of wireless nodes via a plurality of antennas, a memory; and a processor coupled with the memory and configured to determine one or more indications for a set of network load factors for a wireless network of a plurality of wireless nodes and changing, based on the determined one or more indications for a set of network load factors, from a first set of radios used for communicating with at least one of the wireless nodes to a second set of radios used for communicating with at least one of the wireless nodes.

公开(公告)号：US20170303276A1

公开(公告)日：2017-10-19

申请号：US15487026

申请日：2017-04-13

Applicant: QUALCOMM Incorporated

Inventor： Chao CHENG ,  Ning ZHANG ,  Youhan KIM ,  Chin-Hung CHEN

IPC: H04W72/04 ,  H04L5/00 ,  H04W28/02 ,  H04B17/309 ,  H04B7/04

CPC classification number: H04W72/0446 ,  H04B7/0452 ,  H04B17/309 ,  H04B17/318 ,  H04L1/0002 ,  H04L1/0015 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/0027 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/006 ,  H04L5/0094 ,  H04W28/0236 ,  H04W52/0216 ,  H04W52/245 ,  H04W84/12 ,  Y02D70/142 ,  Y02D70/144

Abstract: The disclosure provides for rate adaptation based on channel power tracking in wireless communications. An Access Point (AP) may measure a full-band channel quality information (CQI) for a plurality of wireless stations associated with the AP and allocate a sub-band resource unit from the plurality of sub-band resource units to a wireless station based on the full-band CQI. Aspects of the disclosure also include techniques for adjusting a data rate associated with the wireless station based on a channel power of the sub-band resource unit.

公开(公告)号：US20190141717A1

公开(公告)日：2019-05-09

申请号：US16157945

申请日：2018-10-11

Applicant: QUALCOMM Incorporated

Inventor： Lin YANG ,  Bin TIAN ,  Jialing Li CHEN ,  Lochan VERMA ,  Sameer VERMANI ,  Ning ZHANG ,  Kai SHI ,  Youhan KIM ,  Vincent Knowles JONES, IV

IPC: H04W72/08 ,  H04L5/00 ,  H04L1/00 ,  H03M13/11 ,  H03M13/00

Abstract: Aspects of the present disclosure provide techniques for interleaving in single user (SU) preamble puncturing in wireless local area networks (WLANs). In one implementation, a wireless device can identify an SU preamble puncture transmission, encode information for the SU preamble puncture transmission to produce encoded bits, parse the encoded bits into multiple segments, parse the encoded bits among multiple resource units (RUs) within each of the multiple segments, and perform a tone interleaving of the encoded bits within each of the multiple RUs. These techniques can be used in a 6 GHz band, as well as a 2.4 GHz band or a 5 GHz band.

公开(公告)号：US20170188191A1

公开(公告)日：2017-06-29

申请号：US15080337

申请日：2016-03-24

Applicant: QUALCOMM Incorporated

Inventor： Carlos Horacio ALDANA ,  Ning ZHANG ,  James Simon CHO ,  Xiaoxin ZHANG

IPC: H04W4/02 ,  H04L27/26 ,  H04W56/00

CPC classification number: H04W4/023 ,  G01S5/021 ,  G01S5/14 ,  G01S11/08 ,  G01S19/48 ,  H04L27/266 ,  H04W4/02 ,  H04W56/0015 ,  H04W56/0025

Abstract: Disclosed herein are techniques for range measurement between one or more wireless stations (STAs) and a first access point (AP). In various embodiments, the first AP may synchronize a clock of the first AP with clocks of one or more synchronized APs. The first AP may perform a synchronization session with the one or more STAs. The first AP may also transmit one or more Broadcast time-of-departure (TOD) frames to the one or more STAs. Each of the one or more Broadcast TOD frames may include a time of departure of a Broadcast TOD frame from the first AP. A second AP and a third AP of the one or more synchronized APs may also transmit one or more Broadcast TOD frames to the one or more STAs for range and/or position determination.