公开(公告)号：US09060338B2

公开(公告)日：2015-06-16

申请号：US13831238

申请日：2013-03-14

Applicant: QUALCOMM Incorporated

Inventor： Kai Shi ,  Paul Husted ,  Ning Zhang

IPC: H04L1/02 ,  H04W52/02 ,  H04L25/06 ,  H04B7/08

CPC classification number: H04W52/028 ,  H04B7/0857 ,  H04B7/0871 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0296 ,  H04L25/06 ,  H04W52/0245 ,  Y02D70/142 ,  Y02D70/444

Abstract: A single receive chain of a MIMO receiver is activated during a low power listen mode. Upon detecting a legacy short training field (L-STF) in a received packet, the single receive chain performs a first frequency estimation, and activates one or more additional receive chains of the MIMO receiver. The MIMO receiver uses maximal ratio combining (MRC) to receive the signal using the first receive chain and the one or more additional activated receive chains, wherein the MRC is based, at least in part, on the first frequency estimation. The MIMO receiver may determine whether the received packet is a high throughput/very high throughput (HT/VHT) packet, and if not, deactivate the one or more additional receive chains. In one alternative, the additional receive chains are not activated until determining that a HT/VHT packet has been received.

Abstract translation: MIMO接收机的单个接收链在低功率监听模式下被激活。 在接收到的分组中检测到遗留短训练场（L-STF）时，单个接收链执行第一频率估计，并激活MIMO接收机的一个或多个附加接收链。 MIMO接收机使用最大比率组合（MRC）来使用第一接收链和一个或多个附加的激活的接收链接收信号，其中MRC至少部分地基于第一频率估计。 MIMO接收机可以确定所接收的分组是高吞吐量/非常高吞吐量（HT / VHT）分组，如果不是，则去激活一个或多个附加的接收链。 在一个替代方案中，在确定已经接收到HT / VHT分组之前，不激活额外的接收链。

公开(公告)号：US09055458B2

公开(公告)日：2015-06-09

申请号：US13762338

申请日：2013-02-07

Applicant: QUALCOMM Incorporated

Inventor： Shu Du ,  Zhanfeng Jia ,  Ning Zhang ,  Chin-Hung Chen ,  James S. Cho ,  Rahul Tandra ,  Qinghai Gao

IPC: H04W24/02 ,  H04W28/00 ,  H04L1/00 ,  H04B7/04

CPC classification number: H04W24/02 ,  H04B7/0452 ,  H04L1/0007

Abstract: A method of providing aggregated MAC protocol data unit (AMPDU) duration control in a wireless communication device includes setting an AMPDU duration. Pass/fail statistics are collected for each MPDU of an AMPDU in a time window, W. A packet error rate (PER) difference is calculated between first and last sets of MPDUs for each AMPDU in the window. An average PER difference is calculated across all AMPDUs in the window. When the average PER difference is greater than a first threshold, then the AMPDU duration is decreased. When the difference is less than a second threshold, then the AMPDU duration is increased. When the difference is within the first and the second thresholds, then the method returns to the step of collecting for a next time window. The AMPDU duration can also be adjusted based on detected Doppler and line-of-sight transmissions.

Abstract translation: 在无线通信设备中提供聚合MAC协议数据单元（AMPDU）持续时间控制的方法包括设置AMPDU持续时间。 在时间窗口W中收集AMPDU的每个MPDU的通过/失败统计信息。在窗口中的每个AMPDU的第一组和最后一组MPDU之间计算分组错误率（PER）差异。 在窗口中的所有AMPDU之间计算平均PER差异。 当平均PER差大于第一阈值时，AMPDU持续时间减小。 当差值小于第二阈值时，AMPDU持续时间增加。 当差异在第一和第二阈值内时，该方法返回到下一个时间窗口的收集步骤。 AMPDU持续时间也可以根据检测到的多普勒和视线传输进行调整。

公开(公告)号：US20150063500A1

公开(公告)日：2015-03-05

申请号：US14513618

申请日：2014-10-14

Applicant: QUALCOMM Incorporated

Inventor： Kai Shi ,  Paul Husted ,  Ning Zhang

IPC: H04W52/02 ,  H04L25/02 ,  H04B7/08

CPC classification number: H04W52/028 ,  H04B7/0857 ,  H04B7/0871 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0296 ,  H04L25/06 ,  H04W52/0245 ,  Y02D70/142 ,  Y02D70/444

Abstract: A single receive chain of a MIMO receiver is activated during a low power listen mode. Upon detecting a legacy short training field (L-STF) in a received packet, the single receive chain performs a first frequency estimation, and activates one or more additional receive chains of the MIMO receiver. The MIMO receiver uses maximal ratio combining (MRC) to receive the signal using the first receive chain and the one or more additional activated receive chains, wherein the MRC is based, at least in part, on the first frequency estimation. The MIMO receiver may determine whether the received packet is a high throughput/very high throughput (HT/VHT) packet, and if not, deactivate the one or more additional receive chains. In one alternative, the additional receive chains are not activated until determining that a HT/VHT packet has been received.

Abstract translation: MIMO接收机的单个接收链在低功率监听模式下被激活。 在接收到的分组中检测到遗留短训练场（L-STF）时，单个接收链执行第一频率估计，并激活MIMO接收机的一个或多个附加接收链。 MIMO接收机使用最大比率组合（MRC）来使用第一接收链和一个或多个附加的激活的接收链接收信号，其中MRC至少部分地基于第一频率估计。 MIMO接收机可以确定所接收的分组是高吞吐量/非常高吞吐量（HT / VHT）分组，如果不是，则去激活一个或多个附加的接收链。 在一个替代方案中，在确定已经接收到HT / VHT分组之前，不激活额外的接收链。

公开(公告)号：US20150063283A1

公开(公告)日：2015-03-05

申请号：US14537829

申请日：2014-11-10

Applicant: QUALCOMM Incorporated

Inventor： Kai Shi ,  Ning Zhang

IPC: H04L5/00

CPC classification number: H04L5/0048 ,  H04B7/0413 ,  H04B7/0421 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/023 ,  H04L27/2657 ,  H04L27/2672 ,  H04L27/2675 ,  H04L27/2695

Abstract: In a multiple-input, multiple-output (MIMO) system, a wireless node's receive chain demodulation function is enhanced to include phase tracking. VHT Long Training Fields (LTFs) embedded in a frame preamble are used for phase tracking. Single stream pilot tones are added during transmission of VHT-LTFs. A receiver estimates the channel using the pilot tones in a first set of LTFs. A second set of LTFs are used to estimate the phase of the pilot tones using the estimated channel. The phase estimation is continuously applied to other received data tones throughout the VHT-LTFs of data symbols. Phase errors due to PLL mismatches and phase noise are reduced at reception, leading to better signal to noise ratio for different levels of drift and frequency offset. Further, MIMO channel estimation is more accurate, improving the overall wireless network when the accurate MIMO channel estimation data participates in calibration and handshake between wireless nodes.

Abstract translation: 在多输入多输出（MIMO）系统中，无线节点的接收链解调功能被增强以包括相位跟踪。 嵌入在帧前同步码中的VHT长训练场（LTF）用于相位跟踪。 在VHT-LTF的传输期间添加单流导频音。 接收机使用第一组LTF中的导频音来估计信道。 第二组LTF用于使用估计的信道来估计导频音的相位。 在数据符号的整个VHT-LTF中，相位估计被连续地应用于其他接收的数据音调。 在接收时，由于PLL错配和相位噪声引起的相位误差降低，导致不同漂移和频率偏移水平的更好的信噪比。 此外，当准确的MIMO信道估计数据参与无线节点之间的校准和握手时，MIMO信道估计更准确，改善了整个无线网络。

公开(公告)号：US20140313922A1

公开(公告)日：2014-10-23

申请号：US14322800

申请日：2014-07-02

Applicant: QUALCOMM Incorporated

Inventor： Qifan Chen ,  Kai Shi ,  Ning Zhang

IPC: H04W24/08

CPC classification number: H04W24/08 ,  G01S7/40 ,  G01S13/765 ,  H04J3/0667

Abstract: A method and apparatus for improving the accuracy of a round trip time (RTT) estimate between a first device and a second device are disclosed. The method involves calculating an acknowledgement correction factor and a unicast correction factor. These correction factors are used to compensate for symbol boundary time errors resulting from multipath effects.

Abstract translation: 公开了一种用于提高第一设备和第二设备之间的往返时间（RTT）估计精度的方法和设备。 该方法涉及计算确认校正因子和单播校正因子。 这些校正因子用于补偿由多径效应引起的符号边界时间误差。

公开(公告)号：US20140269994A1

公开(公告)日：2014-09-18

申请号：US13826659

申请日：2013-03-14

Applicant: QUALCOMM INCORPORATED

Inventor： Sandip HomChaudhuri ,  Kai Shi ,  Alireza Raissinia ,  Ning Zhang

IPC: H04W52/02 ,  H04B7/08

CPC classification number: H04W52/0209 ,  H04B7/0617 ,  H04B7/0822 ,  H04B7/0874 ,  H04W52/028 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/22 ,  Y02D70/444

Abstract: A wireless device that operates in accordance with the IEEE 802.11 standard receives the preamble of a packet with the highest number of receive chains enabled, thereby obtaining the highest gain, detection sensitivity and range. The wireless device determines a signal-to-noise ratio (SNR) in response to two different short training fields (STFs) in the preamble. The wireless device also determines a modulation and coding scheme (MCS) and a number of spatial streams (Nss) used to transmit the received packet in response to a signal field of the preamble. The wireless device uses these determined parameters to identify a minimum number of the receive chains required to reliably receive the packet. The wireless device uses only the identified minimum number of receive chains to perform channel estimation and receive the data portion of the packet.

Abstract translation: 根据IEEE 802.11标准操作的无线设备接收具有最高数量的接收链启用的分组的前同步码，从而获得最高增益，检测灵敏度和范围。 无线设备响应于前导码中的两个不同的短训练场（STF）来确定信噪比（SNR）。 无线设备还确定响应于前导码的信号字段而用于发送所接收的分组的调制和编码方案（MCS）和多个空间流（Nss）。 无线设备使用这些确定的参数来识别可靠地接收分组所需的接收链的最小数量。 无线设备仅使用所识别的最小数量的接收链来执行信道估计并接收数据包的数据部分。

公开(公告)号：US20140269462A1

公开(公告)日：2014-09-18

申请号：US13797608

申请日：2013-03-12

Applicant: QUALCOMM INCORPORATED

Inventor： Zhanfeng Jia ,  David Su ,  Ning Zhang ,  Kai Shi

IPC: H04W52/02

CPC classification number: H04W52/0229 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/162

Abstract: A wake-up radio is configured to scan for transmissions while the radio receiver is in sleep mode. The wake-up radio detects incoming RF transmissions intended for the radio receiver by analyzing data frame characteristics in an incoming RF transmission. The data frame characteristics may contain a signature code that is unique to the radio receiver. The signature code may be based on the time duration of a sequence of orthogonal frequency division multiplex (OFDM) symbols received in a clear to send to self (CTS2S) transmission or a time duration of short interframe spaces (SIFS) used to transmit the data frames.

Abstract translation: 唤醒无线电被配置为在无线电接收机处于睡眠模式时扫描传输。 唤醒无线电通过分析进入RF传输中的数据帧特性来检测用于无线电接收机的进入RF传输。 数据帧特征可以包含无线电接收机唯一的签名代码。 签名代码可以基于在清除发送到自身（CTS2S）传输中接收的正交频分复用（OFDM）符号的序列的持续时间或用于发送数据的短帧间间隔（SIFS）的持续时间 框架。

公开(公告)号：US20140235270A1

公开(公告)日：2014-08-21

申请号：US14345941

申请日：2012-09-19

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxin Zhang ,  Ning Zhang

IPC: H04W4/02

CPC classification number: H04W4/02 ,  G01S5/021 ,  G01S5/14 ,  G01S13/876

Abstract: A TOA positioning system can be implemented that employs a calculated initial location of a wireless network device. For each of a plurality of reference wireless network devices, a distance between the wireless network device and the reference wireless network device is determined based, at least in part, on a round trip transit time between the wireless network device and the reference wireless network device. An initial location of the wireless network device can be calculated based, at least in part, on a location of each of the plurality of reference wireless network devices. A location of the wireless network device can be estimated based, at least in part, on the calculated initial location, the distance to each of the reference wireless network devices, and an initial distance calibration constant.

Abstract translation: 可以实现采用计算的无线网络设备的初始位置的TOA定位系统。 对于多个参考无线网络设备中的每一个，无线网络设备和参考无线网络设备之间的距离至少部分地基于无线网络设备和参考无线网络设备之间的往返传送时间来确定 。 可以至少部分地基于多个参考无线网络设备中的每一个的位置来计算无线网络设备的初始位置。 可以至少部分地基于所计算的初始位置，到每个参考无线网络设备的距离以及初始距离校准常数来估计无线网络设备的位置。

公开(公告)号：US20140206389A1

公开(公告)日：2014-07-24

申请号：US13747843

申请日：2013-01-23

Applicant: QUALCOMM INCORPORATED

Inventor： Carlos Horacio Aldana ,  Ning Zhang ,  Mary A. Fales

IPC: H04W4/02

CPC classification number: H04W4/023 ,  H04L51/20 ,  H04W4/021 ,  H04W4/022 ,  H04W4/026 ,  H04W4/027 ,  H04W4/029 ,  H04W4/04

Abstract: Aspects of determining a geographical state of a target through a user device are provided. One method includes identifying at least one target associated with a target device configured to provide position data in a standard reference frame along with corresponding time values, and sending a request for access to geographical state information for at least one target. The method may further include receiving geographical state information associated with the at least one target, and generating a visual identifier of the at least one target based on the geographical state information. The visual identifier may be associated with data captured by an imaging sensor which is functionally coupled to the user device. Systems and apparatuses for determining a geographical state of a target through a user device are further presented.

Abstract translation: 提供通过用户设备确定目标的地理状态的方面。 一种方法包括识别与被配置为在标准参考帧中提供位置数据以及对应的时间值的目标设备相关联的至少一个目标，以及发送访问至少一个目标的地理状态信息的请求。 所述方法还可以包括接收与所述至少一个目标相关联的地理状态信息，以及基于所述地理状态信息生成所述至少一个目标的视觉标识符。 视觉标识符可以与由功能上耦合到用户设备的成像传感器捕获的数据相关联。 进一步介绍用于通过用户设备确定目标的地理状态的系统和装置。

公开(公告)号：US20140160947A1

公开(公告)日：2014-06-12

申请号：US13707511

申请日：2012-12-06

Applicant: QUALCOMM INCORPORATED

Inventor： Shu Du ,  Zhanfeng Jia ,  Ning Zhang ,  Guido Robert Frederiks ,  Vincent Knowles Jones, IV ,  Qinghai Gao

IPC: H04W24/02

CPC classification number: H04W24/02 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0626 ,  H04J9/00 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0019 ,  H04L1/0026 ,  H04L1/06 ,  H04L1/203 ,  H04W28/06 ,  Y02D50/10

Abstract: A method of providing rate adaptation in a multi-user wireless communication system including single-user beamforming (SU-BF) and multi-user multiple-input multiple-output (MU-MIMO) is described. In this method, a master rate, which is a modulation and coding scheme (MCS) for the SU-BF, is determined. An MCS for each transmit mode is derived from the master rate using a rate mapping. Using the results from the mapping, the master rate, instead of the MCS for each transmit mode, is tracked. In one embodiment, a mapping calibration is periodically performed.

Abstract translation: 描述了在包括单用户波束成形（SU-BF）和多用户多输入多输出（MU-MIMO）的多用户无线通信系统中提供速率适配的方法。 在该方法中，确定作为SU-BF的调制和编码方案（MCS）的主速率。 使用速率映射从主速率导出每个发送模式的MCS。 使用映射的结果，跟踪每个传输模式的主速率而不是MCS。 在一个实施例中，定期执行映射校准。