公开(公告)号：US08989307B2

公开(公告)日：2015-03-24

申请号：US13786406

申请日：2013-03-05

Applicant: QUALCOMM Incorporated

Inventor： Hao Zhou ,  Ning Zhang

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49 ,  H04B1/04 ,  H03F1/32

CPC classification number: H04B1/0475 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3258 ,  H03F1/3294 ,  H04B2001/0425

Abstract: A power amplifier system including a composite digital predistorter (DPD) ensuring optimized linearity for the power amplifier is described. In this system, a digital-to-analog converter (DAC), an analog filter, a first mixer, and the power amplifier are serially coupled to the composite DPD. A second mixer, a receive gain block, and an analog-to-digital converter (ADC) are serially coupled to the output of the power amplifier. A DPD training component is coupled between the inputs of the composite DPD and the ADC. The composite DPD includes a memory-based DPD, e.g., a memory polynomial (MP) DPD, a memoryless-linearizing DPD, e.g., a look-up table (LUT) DPD, and two multiplexers.

Abstract translation: 描述了一种包括确保功率放大器的优化线性度的复合数字预失真器（DPD）的功率放大器系统。 在该系统中，数模转换器（DAC），模拟滤波器，第一混频器和功率放大器串联耦合到复合DPD。 第二混频器，接收增益模块和模数转换器（ADC）串联耦合到功率放大器的输出端。 DPD训练组件耦合在复合DPD和ADC的输入之间。 复合DPD包括基于存储器的DPD，例如存储器多项式（MP）DPD，无记忆线性化DPD，例如查找表（LUT）DPD和两个多路复用器。

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。

公开(公告)号：US08861355B2

公开(公告)日：2014-10-14

申请号：US13677251

申请日：2012-11-14

Applicant: QUALCOMM Incorporated

Inventor： Zhanfeng Jia ,  Shu Du ,  Ning Zhang

IPC: H04L1/00 ,  H04W28/02 ,  H04L12/18 ,  H04W4/06 ,  H04L1/16

CPC classification number: H04W28/0236 ,  H04L1/0002 ,  H04L1/0019 ,  H04L1/0027 ,  H04L1/0033 ,  H04L1/1685 ,  H04L12/189 ,  H04L2001/0093 ,  H04W4/06

Abstract: A method of providing multicast rate control in a wireless communication device can include transmitting data frames to a plurality of stations in a multicast group with a first data rate. Acknowledgements (ACKs) can then be requested from a first subset of the plurality of stations. Frame losses can be determined using the ACKs from the first subset. A second data rate can be determined based on the frame losses with the first subset. A second subset of the plurality of stations can be selected based on the frame losses with the first subset. Data frames can be transmitted to the plurality of stations with the second data rate. Notably, ACKs only from the second subset of the plurality of stations are requested. Frame losses for the second subset can be determined using those ACKs. A current data rate can be adjusted based on the frame losses for the subset and at least one predetermined threshold. Data frames can be transmitted to the plurality of stations using the adjusted data rate.

Abstract translation: 一种在无线通信设备中提供组播速率控制的方法可以包括以多个第一数据速率向组播组中的多个站发送数据帧。 然后可以从多个站的第一子集请求致谢（ACK）。 可以使用来自第一子集的ACK来确定帧丢失。 可以基于第一子集的帧丢失来确定第二数据速率。 可以基于与第一子集的帧丢失来选择多个站的第二子集。 可以以第二数据速率将数据帧发送到多个站。 值得注意的是，请求仅来自多个站的第二子集的ACK。 可以使用这些ACK来确定第二子集的帧丢失。 可以基于子集的帧丢失和至少一个预定阈值来调整当前数据速率。 可以使用经调整的数据速率将数据帧发送到多个站。

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。

公开(公告)号：US20130316665A1

公开(公告)日：2013-11-28

申请号：US13956254

申请日：2013-07-31

Applicant: QUALCOMM Incorporated

Inventor： Youhan Kim ,  Ning Zhang ,  Chin-Hung Chen

IPC: H04B7/04

CPC classification number: H04B7/0456 ,  H03M13/6312 ,  H04B7/0413 ,  H04L1/0071 ,  H04L1/0606 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/0064 ,  H04L27/2626 ,  H04L27/2647

Abstract: A wireless transmitter can include a plurality of bandwidth modules, each bandwidth module processing data based on a predetermined frequency band. In one embodiment, such a wireless transmitter can include encoding components for receiving transmit data and generating encoded data. A multiple-input multiple-output (MIMO) stream parser can receive the encoded data and generate a plurality of MIMO streams. A first module parser coupled to a first MIMO stream can generate a first plurality of partial MIMO streams. A first bandwidth module can include a first interleaver that interleaves bits of the first partial MIMO stream and generates first interleaved data. A second bandwidth module can include a second interleaver that interleaves bits of the second partial MIMO stream and generates second interleaved data. A first inverse fast Fourier transform (IFFT) unit can combine and process the first and second interleaved data and generate a first transmission MIMO stream.

Abstract translation: 无线发射机可以包括多个带宽模块，每个带宽模块基于预定频带处理数据。 在一个实施例中，这样的无线发射机可以包括用于接收发送数据和生成编码数据的编码组件。 多输入多输出（MIMO）流解析器可以接收编码数据并产生多个MIMO流。 耦合到第一MIMO流的第一模块解析器可以生成第一多个部分MIMO流。 第一带宽模块可以包括交织第一部分MIMO流的比特并产生第一交织数据的第一交织器。 第二带宽模块可以包括交织第二部分MIMO流的比特并产生第二交织数据的第二交织器。 第一逆快速傅里叶变换（IFFT）单元可以组合并处理第一和第二交错数据并生成第一传输MIMO流。

公开(公告)号：US20210067383A1

公开(公告)日：2021-03-04

申请号：US17097812

申请日：2020-11-13

Applicant: QUALCOMM Incorporated

Inventor： Lin Yang ,  Bin Tian ,  Jialing Li Chen ,  Louay Jalloul ,  Vincent Knowles Jones, IV ,  Ning Zhang ,  Chi-Lin Su ,  Ahmad Abdulrahman Mohammed

IPC: H04L25/02 ,  H04L27/26 ,  H04W72/04 ,  H04L5/00

Abstract: Methods, systems, and devices for wireless communication are described. In some systems (e.g., Wi-Fi systems), a transmitting device such as an access point (AP) or mobile station (STA), may identify a number of spatial streams for a data transmission that is less than a number of transmit antennas, and may transmit a packet over a channel. In a first implementation, the packet may be formatted in a multi-user frame format, with a number of long training field (LTF) symbols equal to the number of transmit antennas. In a second implementation, the packet may be a null data packet (NDP), and the device may transmit a separate data packet. In a third implementation, the packet may be formatted in single-user frame format with a modified LTF. A receiving device may receive the packet, and may perform channel estimation and power amplifier (PA) distortion cancellation based on the received packet.

公开(公告)号：US10462633B2

公开(公告)日：2019-10-29

申请号：US15621914

申请日：2017-06-13

Applicant: QUALCOMM Incorporated

Inventor： Anssi Haverinen ,  Xiaoxin Zhang ,  Ning Zhang ,  Sandeep Kesireddy

IPC: H04B7/00 ,  H04W4/80 ,  H04B17/20 ,  H04B7/08 ,  H04W4/02 ,  H04B17/12 ,  H04L29/08 ,  H04W84/12 ,  H04W84/18

Abstract: This disclosure provides systems, methods and apparatuses for detecting motion based on wireless signals. In some implementations, a receiving device may receive, from a transmitting device, a packet containing a sequence. In some aspects, the packet may be a Bluetooth packet, and the sequence may be contained in a supplemental information appended to the Bluetooth packet. The receiving device may estimate angle information of the packet based on the sequence, and determine a difference between the estimated angle information and a reference angle. The angle information may be an angle of arrival (AoA) or an angle of departure (AoD) of the packet. The receiving device may detect motion based on the determined difference.

公开(公告)号：US20190271775A1

公开(公告)日：2019-09-05

申请号：US15983065

申请日：2018-05-17

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxin Zhang ,  Youngsin Lee ,  Ning Zhang ,  Erik Lindskog ,  Vincent Knowles Jones, IV

IPC: G01S13/56 ,  H04W64/00 ,  H04W52/02 ,  H04W4/38 ,  G01S13/00

Abstract: This disclosure provides systems, methods and apparatuses for detecting motion based on one or more wireless signals. In some implementations, a receiving device may receive a first frame and a second frame from a transmitting device, may determine a first channel impulse response (CIR) based on the first frame, may determine a second CIR based on the second frame, may determine a difference between a shape of the first CIR and a shape of the second CIR, and may detect motion based on the determined difference.

公开(公告)号：US10159068B2

公开(公告)日：2018-12-18

申请号：US15466167

申请日：2017-03-22

Applicant: QUALCOMM Incorporated

Inventor： Ning Zhang ,  Xiaoxin Zhang ,  Kai Shi

IPC: H04W72/04 ,  H04L5/00 ,  H04W24/02 ,  H04L27/26 ,  H04L25/02

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：US20180262866A1

公开(公告)日：2018-09-13

申请号：US15621914

申请日：2017-06-13

Applicant: QUALCOMM Incorporated

Inventor： Anssi Haverinen ,  Xiaoxin Zhang ,  Ning Zhang ,  Sandeep Kesireddy

IPC: H04W4/00 ,  H04B17/20 ,  H04B7/08

CPC classification number: H04W4/80 ,  H04B7/0822 ,  H04B17/12 ,  H04B17/20 ,  H04L67/12 ,  H04W4/02 ,  H04W84/12 ,  H04W84/18

Abstract: This disclosure provides systems, methods and apparatuses for detecting motion based on wireless signals. In some implementations, a receiving device may receive, from a transmitting device, a packet containing a sequence. In some aspects, the packet may be a Bluetooth packet, and the sequence may be contained in a supplemental information appended to the Bluetooth packet. The receiving device may estimate angle information of the packet based on the sequence, and determine a difference between the estimated angle information and a reference angle. The angle information may be an angle of arrival (AoA) or an angle of departure (AoD) of the packet. The receiving device may detect motion based on the determined difference.