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    Selecting Frequency Bands For Transmitting Data Packets
    11.
    发明申请
    Selecting Frequency Bands For Transmitting Data Packets 有权
    选择发送数据包的频带

    公开(公告)号：US20160088630A1

    公开(公告)日：2016-03-24

    申请号：US14960764

    申请日：2015-12-07

    Applicant: QUALCOMM Incorporated

    Inventor： Youhan Kim ,  James S. Cho ,  Kai Shi ,  Nlng Zhang

    IPC: H04W72/04 ,  H04L5/00

    CPC classification number: H04W72/0453 ,  H04L1/0643 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0053

    Abstract: A first combination of frequency bands is selected for transmitting a first data packet, and a second, different combination of frequency bands is selected for transmitting a second data packet. A data stream is divided into a first set of data and a second set of data. The first set of data is allocated to the first combination of frequency bands, and the second set of data is allocated to the second combination of frequency bands.

    Abstract translation: 选择频带的第一组合用于发送第一数据分组，并且选择频带的第二不同组合来发送第二数据分组。 数据流被分为第一组数据和第二组数据。 第一组数据被分配给频带的第一组合，并且第二组数据被分配给频带的第二组合。

    Signature-coded wake-up transmission
    12.
    发明授权
    Signature-coded wake-up transmission 有权
    签名编码唤醒传输

    公开(公告)号：US09204394B2

    公开(公告)日：2015-12-01

    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。

    Method and apparatus for determining distance in a Wi-Fi network
    13.
    发明授权
    Method and apparatus for determining distance in a Wi-Fi network 有权
    用于确定Wi-Fi网络中的距离的方法和装置

    公开(公告)号：US09143967B2

    公开(公告)日：2015-09-22

    申请号：US14322800

    申请日：2014-07-02

    Applicant: QUALCOMM Incorporated

    Inventor： Qifan Chen ,  Kai Shi ,  Ning Zhang

    IPC: H04L12/26 ,  H04W24/08 ,  G01S7/40 ,  G01S13/76 ,  H04J3/06

    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。

    Single Stream PhaseTracking During Channel Estimation In A Very High Throughput Wireless MIMO Communication System
    14.
    发明申请
    Single Stream PhaseTracking During Channel Estimation In A Very High Throughput Wireless MIMO Communication System 有权
    在非常高吞吐量的无线MIMO通信系统中的信道估计期间的单流相位跟踪

    公开(公告)号：US20130315326A1

    公开(公告)日：2013-11-28

    申请号：US13947653

    申请日：2013-07-22

    Applicant: QUALCOMM Incorporated

    Inventor： Kai Shi ,  Ning Zhang

    IPC: H04B7/04

    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。

    Transmitter warm-up using dummy frame generation
    16.
    发明授权
    Transmitter warm-up using dummy frame generation 有权
    发射机预热使用虚拟帧生成

    公开(公告)号：US09055590B2

    公开(公告)日：2015-06-09

    申请号：US13718724

    申请日：2012-12-18

    Applicant: QUALCOMM Incorporated

    Inventor： Ahmed H. Hassan ,  Kai Shi ,  John Thomson ,  Tao-Fei S. Ng ,  Sankara S. Venkateswaran ,  James S. Cho

    IPC: H04B1/44 ,  H04W74/08 ,  H04B1/04 ,  H04L12/751 ,  H04L25/02 ,  H04L29/08 ,  H04L1/00

    CPC classification number: H04W74/0808 ,  H04B1/0475 ,  H04L1/0008 ,  H04L25/0218 ,  H04L29/08612 ,  H04L45/026

    Abstract: An electronic device includes a medium access controller (MAC) to generate frames and transmitter circuitry to convert the frames to radio-frequency (RF) analog signals for transmission. The MAC is to initiate frame generation at a time that precedes initiation of RF analog signal transmission by a specified time period. In a first mode, the MAC is to generate a dummy frame during a first portion of the specified time period and to initiate generation of a transmit frame during a subsequent second portion of the specified time period. Also in the first mode, the transmitter circuitry is to convert the dummy frame into a first analog signal, discard the first analog signal, convert the transmit frame into a second analog signal, and transmit the second analog signal.

    Abstract translation: 电子设备包括用于产生帧和传输器电路的介质访问控制器（MAC），以将帧转换成用于传输的射频（RF）模拟信号。 MAC将在RF模拟信号传输开始之前的某个时间启动帧生成指定的时间段。 在第一模式中，MAC在指定时间周期的第一部分期间生成虚拟帧，并且在指定时间段的后续第二部分期间开始生成发送帧。 同样在第一模式中，发射机电路将虚拟帧转换为第一模拟信号，丢弃第一模拟信号，将发送帧转换为第二模拟信号，并发送第二模拟信号。

    Single stream phase tracking during channel estimation in a very high throughput wireless MIMO communication system
    17.
    发明授权
    Single stream phase tracking during channel estimation in a very high throughput wireless MIMO communication system 有权
    在非常高吞吐量的无线MIMO通信系统中的信道估计期间的单流相位跟踪

    公开(公告)号：US08885755B2

    公开(公告)日：2014-11-11

    申请号：US13947653

    申请日：2013-07-22

    Applicant: QUALCOMM Incorporated

    Inventor： Kai Shi ,  Ning Zhang

    IPC: H04L27/28 ,  H04L25/02 ,  H04L27/26 ,  H04B7/04

    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。

    Method And Apparatus For Switching Between Low-Power, Single-Chain Listen And Multiple-Chain Demodulation
    18.
    发明申请
    Method And Apparatus For Switching Between Low-Power, Single-Chain Listen And Multiple-Chain Demodulation 有权
    用于在低功率，单链听和多链解调之间切换的方法和装置

    公开(公告)号：US20140269995A1

    公开(公告)日：2014-09-18

    申请号：US13831238

    申请日：2013-03-14

    Applicant: QUALCOMM INCORPORATED

    Inventor： Kai Shi ,  Paul J. Husted ,  Ning Zhang

    IPC: 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。

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