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公开(公告)号：US20170180179A1
公开(公告)日：2017-06-22
申请号：US15450773
申请日：2017-03-06
Applicant: QUALCOMM Incorporated
Inventor： Kai Shi , Ning Zhang
IPC: H04L27/26 , H04L25/02 , H04B7/0413
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 MIMO a wireless node's receive chain demodulation function is enhanced to include phase tracking using very high-throughput long training fields (VHT-LTFs) embedded in a frame preamble. 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 VHT-LTFs, and estimates the phase of the pilot tones using a second set of VHT-LTFs. The phase estimation receiver estimates the channel using the pilot tones in a first set of VHT-LTFs. 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.
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公开(公告)号：US20160149727A1
公开(公告)日：2016-05-26
申请号：US14553854
申请日：2014-11-25
Applicant: QUALCOMM Incorporated
Inventor： Zixia Hu , Kai Shi , Chin-Hung Chen , Ning Zhang
CPC classification number: H04L25/0204 , H04L25/0212 , H04L25/0226
Abstract: A method of determining a channel response of a communications channel. A computing device receives a data packet via the communications channel and generates a first channel estimation based on a first portion of a preamble of the received data packet. The computing device further generates a second channel estimation based on a second portion of the preamble and determines the channel response of the communications channel based, at least in part, on an average of the first and second channel estimations. For example, the first portion of the preamble may correspond with a Long Training Field (LTF), and the second portion of the preamble may correspond with a Very High Throughput Signal B (VHT-SIG-B) field.
Abstract translation: 一种确定通信信道的信道响应的方法。 计算设备经由通信信道接收数据分组，并且基于接收到的数据分组的前导码的第一部分生成第一信道估计。 所述计算设备还基于所述前导码的第二部分生成第二信道估计，并且至少部分地基于所述第一和第二信道估计的平均值来确定所述通信信道的信道响应。 例如，前导码的第一部分可以对应于长训练场（LTF），并且前同步码的第二部分可以对应于极高吞吐量信号B（VHT-SIG-B）字段。
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33.发明授权公开(公告)号：US09167531B2
公开(公告)日：2015-10-20
申请号：US14513618
申请日：2014-10-14
Applicant: QUALCOMM Incorporated
Inventor： Kai Shi , Paul Husted , Ning Zhang
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.
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34.发明授权Method and apparatus for switching between low-power, single-chain listen and multiple-chain demodulation 有权用于在低功率，单链听和多链路解调之间进行切换的方法和装置公开(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
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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35.发明申请公开(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
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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Patent Agency Ranking
36.发明申请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：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。
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公开(公告)号：US20140357193A1
公开(公告)日：2014-12-04
申请号：US14286565
申请日：2014-05-23
Applicant: QUALCOMM Incorporated
Inventor： Jubin Jose , Ying Wang , Kai Shi , Xinzhou Wu , Junyi Li
Abstract: Methods, systems, and devices are described for detecting dedicated short range communications (DSRC) transmissions to determine whether to use at least a portion of the DSRC spectrum. In one embodiment, a multi-mode device may be operated outside of the DSRC spectrum using a first clock rate, and may then be switched to a second clock rate while operating outside of the DSRC spectrum to detect DSRC transmissions using the DSRC spectrum.
Abstract translation: 描述了用于检测专用短距离通信（DSRC）传输以确定是否使用DSRC频谱的至少一部分的方法，系统和设备。 在一个实施例中，多模式设备可以使用第一时钟速率在DSRC频谱之外操作，然后可以在DSRC频谱之外操作时切换到第二时钟速率，以使用DSRC频谱来检测DSRC传输。
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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。
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39.发明申请Systems And Methods For Antenna Management Using Per-Packet Channel Information 有权使用每分组信道信息进行天线管理的系统和方法公开(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
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。
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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。
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