公开(公告)号：US20150200749A1

公开(公告)日：2015-07-16

申请号：US14156834

申请日：2014-01-16

Applicant: QUALCOMM Incorporated

Inventor： Kai Shi ,  Ning Zhang

IPC: H04L1/00 ,  H04L27/26 ,  H04L29/06

CPC classification number: H04L1/0063 ,  H04L1/0042 ,  H04L1/0057 ,  H04L1/0065 ,  H04L1/0068 ,  H04L1/0618 ,  H04L27/2627 ,  H04L69/22

Abstract: A system and method for transmitting LDPC parameters is provided. In the method, an initial number of OFDM symbols (Nsym_init) is determined for a packet that is based on the number of information bits to be delivered in the packet. An STBC value is also determined. A number of extra symbols (Nsym_ext) value is generated based on the Nsym_init value, wherein a Nsym value is based on said Nsym_init value and said Nsym_ext value. An Nldpc_ext value is determined based on the STBC value and the Nsym_ext value for purposes of determining LDPC parameters associated with the packet.

Abstract translation: 提供了一种传输LDPC参数的系统和方法。 在该方法中，基于要在分组中传送的信息比特的数量的分组来确定初始数目的OFDM符号（Nsym_init）。 还确定了STBC值。 基于Nsym_init值生成多个额外符号（Nsym_ext）值，其中Nsym值基于所述Nsym_init值和所述Nsym_ext值。 为了确定与分组相关联的LDPC参数，基于STBC值和Nsym_ext值确定Nldpc_ext值。

公开(公告)号：US09055459B2

公开(公告)日：2015-06-09

申请号：US13762342

申请日：2013-02-07

Applicant: QUALCOMM Incorporated

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

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

CPC classification number: H04W24/02 ,  H04B7/0452 ,  H04L1/0002 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/0019 ,  H04L1/0033 ,  H04L1/06 ,  Y02D50/10

Abstract: A method of performing dual-mode rate control for an access point in a wireless communication system includes a single-user mode of operation and a multi-user mode of operation. In the single-user mode, a basic rate for a station is determined based on channel conditions. In the multi-user mode, a rate for a plurality of stations is determined using tracking. The tracking includes performing a sounding for the plurality of stations. An initial multi-user current rate is then set equal to a function of a number of users and the basic rate. A transmission is sent to the plurality of stations using the current rate. A packet error rate (PER) is detected during transmission to the plurality of stations. The current rate is adjusted based on the PER. After rate adjustment, either sounding is triggered or the method returns to sending a transmission using the current rate.

Abstract translation: 对无线通信系统中的接入点进行双模速率控制的方法包括单用户操作模式和多用户操作模式。 在单用户模式中，基于信道条件确定站的基本速率。 在多用户模式中，使用跟踪确定多个站的速率。 跟踪包括对多个站执行探测。 然后将初始多用户当前速率设置为等于用户数和基本速率的函数。 使用当前速率向多个站发送传输。 在传输到多个站期间检测到分组错误率（PER）。 当前费率根据PER进行调整。 速率调整后，触发声音或方法返回使用当前速率发送传输。

公开(公告)号：US08891703B2

公开(公告)日：2014-11-18

申请号：US13826659

申请日：2013-03-14

Applicant: QUALCOMM Incorporated

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

IPC: H04B7/10 ,  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：US20140273963A1

公开(公告)日：2014-09-18

申请号：US14040213

申请日：2013-09-27

Applicant: QUALCOMM Incorporated

Inventor： David Kuochieh Su ,  Ning Zhang

IPC: H04W12/06 ,  H04L29/06

CPC classification number: H04W52/0264 ,  G06F21/32 ,  G06F21/44 ,  H04L63/0861 ,  H04L63/0876 ,  H04W12/06 ,  Y02D70/00 ,  Y02D70/166 ,  Y02D70/26

Abstract: A beacon message is wirelessly transmitted from a first device. The first device receives a first response to the beacon message, wherein the first response includes identification values associated with a personal identification device. A second device associated with the personal identification device is communicated with. The personal identification device is authenticated based, at least in part, on the identification values and the communication with the second device.

Abstract translation: 从第一设备无线发送信标消息。 第一设备接收对信标消息的第一响应，其中第一响应包括与个人识别设备相关联的标识值。 与个人识别装置相关联的第二设备被通信。 至少部分地基于识别值和与第二设备的通信来认证个人识别设备。

公开(公告)号：US20140269377A1

公开(公告)日：2014-09-18

申请号：US13924377

申请日：2013-06-21

Applicant: QUALCOMM Incorporated

Inventor： Zhanfeng Jia ,  Shu Du ,  Ning Zhang

IPC: H04W24/00

CPC classification number: H04L1/00 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/1671 ,  H04L1/20

Abstract: A method of providing feedback on channel observations to a transmitter includes observing a channel at a receiver based on received signals from the transmitter and determining whether a packet error rate (PER) is rising based on the observing. The receiver determines whether a rising PER is caused by channel noise or interference, and transmits a message to the transmitter indicating the cause of the rising PER. The cause may be encoded in reserved bits of a block acknowledgement (BA) frame or an Acknowledge (ACK) frame, or in a modulation coding scheme (MCS) used to transmit the message. The cause may be detected in response to SNR/RSSI level of received signals, or a number of receiver restarts. The transmitter may change the transmit rate adaptation algorithm to use a lower MCS if channel noise causes the rising PER, and a higher MCS if interference causes the rising PER.

Abstract translation: 向发射机提供信道观测的反馈的方法包括基于来自发射机的接收信号观察接收机处的信道，并基于观测确定分组差错率（PER）是否正在上升。 接收机确定上升的PER是由信道噪声还是干扰引起的，并且向发射机发送指示引起增加的PER的原因的消息。 原因可以在块确认（BA）帧或应答（ACK）帧的保留位或者用于发送消息的调制编码方案（MCS）中编码。 可以响应于接收到的信号的SNR / RSSI电平或者接收机重启的次数来检测原因。 如果信道噪声导致上升的PER，则发射机可以改变发射速率自适应算法以使用较低的MCS，如果干扰导致上升的PER，则发射机可以改变较高的MCS。

公开(公告)号：US20140133303A1

公开(公告)日：2014-05-15

申请号：US13677251

申请日：2012-11-14

Applicant: QUALCOMM INCORPORATED

Inventor： Zhanfeng Jia ,  Shu Du ,  Ning Zhang

IPC: H04W28/02 ,  H04L12/18 ,  H04W4/06

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：US20130301764A1

公开(公告)日：2013-11-14

申请号：US13875120

申请日：2013-05-01

Applicant: QUALCOMM Incorporated

Inventor： Kai Shi ,  Ning Zhang

IPC: H04L27/00

CPC classification number: H04L27/0002 ,  H03G3/3078

Abstract: Functionality can be implemented for automatic gain control (AGC) in a wireless network device to determine whether to change the gain of the wireless network device based on determining the strength of an RF signal. At various time instants, the strength of the RF signal can be compared against different thresholds to determine the presence of and severity of the saturation of the RF front end. The gain settings can be adjusted based on comparing the strength of the RF signal with a set of thresholds. This can help the wireless network device receive RF signals with little or no distortion, and can minimize RF saturation, gain compression, false detection and other performance degradation at the wireless network device.

Abstract translation: 可以在无线网络设备中实现自动增益控制（AGC）的功能，以基于确定RF信号的强度来确定是否改变无线网络设备的增益。 在不同的时刻，RF信号的强度可以与不同的阈值进行比较，以确定RF前端的饱和度的存在和严重程度。 可以根据将RF信号的强度与一组阈值进行比较来调整增益设置。 这可以帮助无线网络设备接收到具有很少或没有失真的RF信号，并且可以最小化无线网络设备处的RF饱和度，增益压缩，错误检测和其他性能下降。

公开(公告)号：US10397816B2

公开(公告)日：2019-08-27

申请号：US14962530

申请日：2015-12-08

Applicant: QUALCOMM Incorporated

Inventor： Youhan Kim ,  Zhanfeng Jia ,  Srinivas Katar ,  Rahul Malik ,  Jay Kumar Sundararajan ,  Arnaud Meylan ,  Ning Zhang ,  George Cherian

IPC: H04W24/10 ,  H04W48/16 ,  H04W28/16 ,  H04W48/12 ,  H04W48/20

Abstract: Methods, apparatus, and computer-readable media for wireless communication may involve techniques for throughput estimation. An expected air time parameter may be used as a parameter for estimating throughput. The expected air time parameter may be indicative of an estimated air time fraction obtainable for communications using an access point (AP), for example, between a wireless station (STA) and the AP. Either the expected air time parameter or an estimated air time fraction determined (e.g., calculated) from the expected air time parameter may be transmitted from the AP to the STA (or other communication device) to allow the STA (or other communication device) to determine an estimated throughput for communications using the AP.

公开(公告)号：US20190230674A1

公开(公告)日：2019-07-25

申请号：US15875878

申请日：2018-01-19

Applicant: Qualcomm Incorporated

Inventor： Chao Cheng ,  Xiaolong Huang ,  Raja Banerjea ,  Ning Zhang

IPC: H04W72/08 ,  H04W72/04 ,  H04L5/00

Abstract: This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for the scheduling of wireless resources to multiple wireless stations participating in a simultaneous transmission. Some implementations more specifically relate to the allocation of resource units (RUs) to stations for an uplink multi-user OFDMA (UL MU-OFDMA) transmission. In some implementations, an access point (AP) may adjust a modulation and coding scheme (MCS) of one of the stations based on the results of a power imbalance check. For example, in response to determining that a station failed the power imbalance check, the AP may reduce the MCS assigned to the station from a current value to a reduced value as opposed to simply dropping the station from the scheduled transmission. In some implementations, the AP then performs another power imbalance check based on the reduced MCS. The process may be repeated in an effort to provide all of the grouped stations the opportunity to successfully participate in the UL MU-OFDMA transmission.

公开(公告)号：US20190116068A1

公开(公告)日：2019-04-18

申请号：US16136572

申请日：2018-09-20

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 ,  H04L5/00 ,  H04W72/04

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.