公开(公告)号：US08755756B1

公开(公告)日：2014-06-17

申请号：US12769536

申请日：2010-04-28

申请人： Ning Zhang ,  David Kuochieh Su ,  William J. McFarland ,  Chin-Hung Chen

发明人： Ning Zhang ,  David Kuochieh Su ,  William J. McFarland ,  Chin-Hung Chen

IPC分类号： H04B1/04

CPC分类号： H04B1/109 ,  H04B1/525

摘要： Various methods and corresponding active interference cancellation units are described. These methods and units can perform active interference cancellation in a system including multiple radios. Notably, signals from a first radio can be received as interference at a second radio. The described methods and units can provide interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio. After tuning of the interference conditioning, the interference can be removed.

摘要翻译： 描述各种方法和相应的主动干扰消除单元。 这些方法和单元可以在包括多个无线电的系统中执行主动干扰消除。 值得注意的是，来自第一无线电的信号可以作为第二无线电的干扰被接收。 所描述的方法和单元可以提供干扰调节，其处理在第一无线电处的干扰的干扰参考以近似在第二无线电处观察到的干扰。 在调谐干扰调节之后，可以去除干扰。

公开(公告)号：US20140071955A1

公开(公告)日：2014-03-13

申请号：US13615446

申请日：2012-09-13

申请人： Shu Du ,  Zhanfeng Jia ,  Ning Zhang ,  Guido Robert Frederiks ,  Vincent Knowles Jones, IV ,  Sameer Vermani ,  Chin-Hung Chen ,  Rahul Tandra ,  Qinghai Gao ,  Balaji Srinivasan Babu

发明人： Shu Du ,  Zhanfeng Jia ,  Ning Zhang ,  Guido Robert Frederiks ,  Vincent Knowles Jones, IV ,  Sameer Vermani ,  Chin-Hung Chen ,  Rahul Tandra ,  Qinghai Gao ,  Balaji Srinivasan Babu

IPC分类号： H04B7/04

CPC分类号： H04B7/0452 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/0647 ,  H04L1/0027 ,  H04L5/00 ,  H04L25/0204 ,  H04L25/0224

摘要： A method of performing dynamic sounding in a wireless communication device includes determining whether to perform sounding based on an age of current channel state information (CSI). An achievable throughput can be recorded as a reference throughput after performing the sounding. A current achievable throughput can be compared with the reference throughput. A CSI timestamp can be reset when the current throughput is above the reference throughput by a first predetermined amount, thereby prolonging a lifespan of the current CSI. The CSI timestamp can be reduced when the current throughput is below the reference throughput by a second predetermined amount, thereby reducing the lifespan of the current CSI.

摘要翻译： 在无线通信装置中执行动态声音的方法包括基于当前信道状态信息（CSI）的年龄确定是否执行发声。 执行声音后可以将可实现的吞吐量记录为参考吞吐量。 可以将当前可实现的吞吐量与参考吞吐量进行比较。 当当前吞吐量高于参考吞吐量第一预定量时，可以重置CSI时间戳，从而延长当前CSI的寿命。 当当前吞吐量低于参考吞吐量第二预定量时，可以减少CSI时间戳，从而减少当前CSI的寿命。

公开(公告)号：US08514976B2

公开(公告)日：2013-08-20

申请号：US13245776

申请日：2011-09-26

申请人： Youhan Kim ,  Ning Zhang ,  Chin-Hung Chen

发明人： Youhan Kim ,  Ning Zhang ,  Chin-Hung Chen

IPC分类号： H04L27/00

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

摘要： 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.

公开(公告)号：US08295263B1

公开(公告)日：2012-10-23

申请号：US12367119

申请日：2009-02-06

申请人： Chin Hung Chen ,  Ning Zhang

发明人： Chin Hung Chen ,  Ning Zhang

IPC分类号： H04J3/00

CPC分类号： H04L1/16 ,  H04B7/0417 ,  H04B7/0617 ,  H04L5/0023 ,  H04L25/0204 ,  H04L2025/03426 ,  H04W24/10

摘要： A process for determining when sounding packets are to be triggered and transmitted in a wireless beamforming system is disclosed. In one embodiment, a timer is programmably set to adapt to the operating environment. Whenever the timer elapses, a sounding packet is triggered and the timer resets. In another embodiment, the sounding packet is triggered by comparing measured correlations of channel characteristics against a programmable correlation threshold. If a measured correlation falls below the correlation threshold, this indicates that the channel has undergone a relatively large change. In response, a new sounding packet is triggered to update the beam steering matrix. Otherwise, the previous beam steering matrix is still used. Thereby, sounding packets are expeditiously triggered to keep the beam steering matrix updated with minimal impact to the over-the-air bandwidth.

摘要翻译： 公开了一种用于确定何时在无线波束成形系统中触发和发送探测分组的过程。 在一个实施例中，可编程地设置定时器以适应操作环境。 无论什么时候，定时器都会触发，并且定时器复位。 在另一个实施例中，通过比较测量的信道特性与可编程相关阈值的相关性来触发探测分组。 如果测量的相关性低于相关阈值，则这表明信道已经经历了相对较大的变化。 作为响应，触发新的探测包以更新波束导向矩阵。 否则，仍然使用先前的波束导引矩阵。 因此，迅速地触发探测分组以保持波束导向矩阵更新，同时对空中带宽的影响最小。

公开(公告)号：US20130322508A1

公开(公告)日：2013-12-05

申请号：US13487106

申请日：2012-06-01

申请人： Chin-Hung Chen ,  Ning Zhang

发明人： Chin-Hung Chen ,  Ning Zhang

IPC分类号： H04B7/08 ,  H04B17/00

CPC分类号： H04B7/0814 ,  H04B7/0811

摘要： A fast diversity technique using either an EESM or a capacity computation can determine antenna selection in a wireless communication device. A fast Fourier transform (FFT) for the EESM/capacity computation can be performed with consecutive samples of a single symbol period of a short training field (STF) of a packet received by each antenna. The effective signal-to-noise ratio (SNR) for each antenna can be calculated using the results of the EESM or capacity computation. The antenna with the highest effective SNR is selected.

摘要翻译： 使用EESM或容量计算的快速分集技术可以确定无线通信设备中的天线选择。 可以对每个天线接收的分组的短训练场（STF）的单个符号周期的连续采样来执行用于EESM /容量计算的快速傅里叶变换（FFT）。 可以使用EESM或容量计算的结果来计算每个天线的有效信噪比（SNR）。 选择具有最高有效SNR的天线。

公开(公告)号：US08175538B1

公开(公告)日：2012-05-08

申请号：US12334799

申请日：2008-12-15

申请人： Chin-Hung Chen ,  Ning Zhang

发明人： Chin-Hung Chen ,  Ning Zhang

IPC分类号： H04B1/00

CPC分类号： H04B7/0413 ,  H04B17/12

摘要： In a multiple-input, multiple-output system, the frequency of transmitted signals can be partitioned into some number of frequency bins. During an exchange of sounding signals, a first station can monitor the quality of the signals to select a second station that is qualified to participate in a calibration procedure. The first station can generate a first set of channel characteristics for a particular frequency bin based on the sounding signal it receives from the second station. The first station also receives channel state information from the second station which can be used to generate a second set of channel characteristics for the particular frequency bin. Then, the selected subsets of the first and second sets can be manipulated in order to determine a set of correction values for that frequency bin as well as for other frequency bins.

摘要翻译： 在多输入多输出系统中，发射信号的频率可以分成若干个频率仓。 在交换探测信号期间，第一站可以监视信号的质量以选择有资格参与校准过程的第二站。 第一站可以基于从第二站接收的探测信号，为特定频率仓产生第一组信道特性。 第一站还从第二站接收可用于为特定频率仓产生第二组信道特性的信道状态信息。 然后，可以操纵第一和第二组的选定子集，以便确定该频率仓以及其它频率仓的一组校正值。

公开(公告)号：US20120076234A1

公开(公告)日：2012-03-29

申请号：US13245776

申请日：2011-09-26

申请人： Youhan Kim ,  Ning Zhang ,  Chin-Hung Chen

发明人： Youhan Kim ,  Ning Zhang ,  Chin-Hung Chen

IPC分类号： H04L27/04

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

摘要： 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.

摘要翻译： 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：US08953726B2

公开(公告)日：2015-02-10

申请号：US13487106

申请日：2012-06-01

申请人： Chin-Hung Chen ,  Ning Zhang

发明人： Chin-Hung Chen ,  Ning Zhang

IPC分类号： H04B7/08

CPC分类号： H04B7/0814 ,  H04B7/0811

摘要： A fast diversity technique using either an EESM or a capacity computation can determine antenna selection in a wireless communication device. A fast Fourier transform (FFT) for the EESM/capacity computation can be performed with consecutive samples of a single symbol period of a short training field (STF) of a packet received by each antenna. The effective signal-to-noise ratio (SNR) for each antenna can be calculated using the results of the EESM or capacity computation. The antenna with the highest effective SNR is selected.

摘要翻译： 使用EESM或容量计算的快速分集技术可以确定无线通信设备中的天线选择。 可以对每个天线接收的分组的短训练场（STF）的单个符号周期的连续采样来执行用于EESM /容量计算的快速傅里叶变换（FFT）。 可以使用EESM或容量计算的结果来计算每个天线的有效信噪比（SNR）。 选择具有最高有效SNR的天线。

公开(公告)号：US08804612B1

公开(公告)日：2014-08-12

申请号：US12542642

申请日：2009-08-17

申请人： Chin-Hung Chen ,  Ning Zhang

发明人： Chin-Hung Chen ,  Ning Zhang

IPC分类号： H04W4/00 ,  H04B7/04 ,  H04B7/06

CPC分类号： H04B7/0456 ,  H04B7/0404 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/0634 ,  H04L1/16 ,  H04L25/0204 ,  H04L2025/03426 ,  H04W24/10

摘要： The antenna configurations of a wireless communications system including a beamformer and beamformee may be changed. In an improved technique for triggering a sounding packet, notification of an antenna re-configuration, either at the beamformer or the beamformee can be quickly used by the beamformer to trigger the sounding packet. In one embodiment, the beamformee can perform its own computations to determine a changing channel. In this embodiment, once a changing channel is detected, the beamformee can notify the beamformer to trigger the sounding packet.

摘要翻译： 可以改变包括波束形成器和波束形成器的无线通信系统的天线配置。 在用于触发探测分组的改进技术中，波束形成器或波束形成器的天线重新配置的通知可以被波束形成器快速地用于触发探测分组。 在一个实施例中，波束形成器可以执行其自己的计算以确定改变的信道。 在本实施例中，一旦检测到改变的信道，波束形成器可以通知波束形成器触发发声分组。

公开(公告)号：US08681896B1

公开(公告)日：2014-03-25

申请号：US12779595

申请日：2010-05-13

申请人： Chin-Hung Chen ,  Ning Zhang

发明人： Chin-Hung Chen ,  Ning Zhang

IPC分类号： H04L25/49

CPC分类号： H04L27/3863 ,  H04B1/30

摘要： Joint transmit error (i.e., carrier leak and I/Q mismatch) calibration can be implemented in a transmitter unit in a wireless device. DC signals can be superposed onto digital complex tone signals to generate calibration signals for joint transmit error calibration. The calibration signals may also be phase shifted and/or pre-distorted with digital I/Q phase to yield distinct calibration measurements that can be used for joint transmit error calibration. Digital scaling can be applied at the transmitter unit in accordance with a transmitter gain setting to maintain a constant receiver gain setting. At a receiver unit of the wireless device, the DC signals can be separated from the digital complex tone signals for transmit error calibration. Such a joint transmit error calibration can minimize calibration time, reduce the number of computations required for transmit error calibration, improve the accuracy of the transmit error calibration, and improve performance of the wireless device.

摘要翻译： 可以在无线设备中的发射机单元中实现联合发射错误（即，载波泄漏和I / Q不匹配）校准。 DC信号可以叠加到数字复音信号上，以产生用于联合发送错误校准的校准信号。 校准信号也可以用数字I / Q相相移和/或预失真，以产生可用于联合发射误差校准的不同校准测量。 可以根据发射机增益设置在发射机单元处应用数字缩​​放以保持恒定的接收机增益设置。 在无线设备的接收机单元处，DC信号可以与数字复音信号分开，用于发送错误校准。 这种联合发射误差校准可以最小化校准时间，减少发射误差校准所需的计算次数，提高发射误差校准的精度，并提高无线设备的性能。