公开(公告)号：US20060269003A1

公开(公告)日：2006-11-30

申请号：US11141271

申请日：2005-05-31

申请人： Joachim Hammerschmidt ,  Xiaowen Wang

发明人： Joachim Hammerschmidt ,  Xiaowen Wang

IPC分类号： H04K1/10

CPC分类号： H04L27/2647 ,  H04L25/06

摘要： Methods and systems are provided for estimating the DC offset distortion in a receiver. A fast Fourier transform is applied to at least a portion of a preamble portion of the received signal; an impact of the DC offset distortion on one or more empty subcarriers is determined; individual DC estimates are derived based on each of the determinations; and each of the individual DC estimates are combined to obtain an overall DC estimate.

摘要翻译： 提供了用于估计接收机中的DC偏移失真的方法和系统。 快速傅里叶变换被应用于接收信号的前导码部分的至少一部分; 确定DC偏移失真对一个或多个空子载波的影响; 基于每个测定得出个体直流估计值; 并且将每个单独的DC估计值组合以获得总体DC估计。

公开(公告)号：US20050163236A1

公开(公告)日：2005-07-28

申请号：US10990143

申请日：2004-11-16

申请人： Joachim Hammerschmidt ,  Robert Kopmeiners ,  Xiaowen Wang

发明人： Joachim Hammerschmidt ,  Robert Kopmeiners ,  Xiaowen Wang

IPC分类号： H04J99/00 ,  H04B7/06 ,  H04L1/06 ,  H04L27/26 ,  H04K1/10

CPC分类号： H04L1/06 ,  H04B7/0671

摘要： A method and apparatus are disclosed for transmitting symbols in a multiple antenna communication system. The disclosed frame structure comprises a preamble having a plurality of long training symbols that are transmitted on a plurality transmit antennas. At least a portion of the frame is delayed on at least one transmit antenna. The disclosed frame formats of the present invention are backwards compatible to existing single antenna communication systems. The delay amount, D, can be approximately equal to one OFDM time sample period, T. The delayed version can be obtained by introducing a time delay into a signal on the delayed branch(es) or by cyclically shifting at least a portion of each frame on the delayed branch(es). The entire frame or only the preamble portion of each frame can be delayed.

摘要翻译： 公开了用于在多天线通信系统中发送符号的方法和装置。 所公开的帧结构包括具有在多个发射天线上发射的多个长训练符号的前同步码。 帧的至少一部分在至少一个发射天线上被延迟。 所公开的本发明的帧格式向后兼容于现有的单一天线通信系统。 延迟量D可以近似等于一个OFDM时间采样周期T.延迟版本可以通过在延迟分支上的信号中引入时间延迟或者通过周期性地移位每个 在延迟分支上的框架。 每个帧的整个帧或仅前导码部分可以被延迟。

公开(公告)号：US10037206B2

公开(公告)日：2018-07-31

申请号：US13823355

申请日：2011-09-22

申请人： Xiaowen Wang

发明人： Xiaowen Wang

IPC分类号： H04L29/06 ,  G06F9/30 ,  G06F21/74

CPC分类号： G06F9/30043 ,  G06F21/74 ,  G06F2221/2105 ,  G06F2221/2145 ,  H04L63/1441

摘要： Disclosed are methods and systems for state switching. The method is applied to a first hardware system. The first hardware system is connected with a second hardware system. The first hardware system has a first operation state and a second operation state. The second hardware system includes a memory unit. The memory unit has a first access state and a second access state. The memory unit is in the first access state currently. The method includes: the first hardware system sends an access state switching instruction to the second hardware system when the first hardware system enters the second operation state from the first operation state, wherein, the access state switching instruction is adapted to switch the memory unit of the second hardware system from the first access state to the second access state. The application of the present invention can ensure the security of key data, avoid the access of key data by malicious software, reduce the implementation costs and has a higher extensibility.

公开(公告)号：US08619907B2

公开(公告)日：2013-12-31

申请号：US11043025

申请日：2005-01-24

申请人： Syed Aon Mujtaba ,  Xiaowen Wang

发明人： Syed Aon Mujtaba ,  Xiaowen Wang

IPC分类号： H04L27/00

CPC分类号： H04B7/0667 ,  H04B7/0684

摘要： Methods and apparatus are provided for communicating data in a multiple antenna communication system having N transmit antennas. According to one aspect of the invention, a header format includes a legacy preamble having at least one legacy long training field and an extended portion having at least N additional long training fields on each of the N transmit antennas. The N additional long training fields may be tone interleaved across the N transmit antennas and are used for MIMO channel estimation. The extended portion may include a short training field for power estimation. The short training field may be tone interleaved across the N transmit antennas and have an extended duration to support beam steering.

摘要翻译： 提供了用于在具有N个发射天线的多天线通信系统中传送数据的方法和装置。 根据本发明的一个方面，报头格式包括具有至少一个传统长训练场的传统前导码和在N个发射天线中的每一个上具有至少N个附加的长训练场的扩展部分。 N个附加的长训练场可以在N个发射天线之间进行音调交织，并用于MIMO信道估计。 扩展部分可以包括用于功率估计的短训练场。 短训练场可以在N个发射天线之间进行音调交织，并具有延长的持续时间以支持波束转向。

公开(公告)号：US20120282975A1

公开(公告)日：2012-11-08

申请号：US13099204

申请日：2011-05-02

申请人： Syed A. Mujtaba ,  Wen Zhao ,  Xiaowen Wang ,  Vinay Majjigi

发明人： Syed A. Mujtaba ,  Wen Zhao ,  Xiaowen Wang ,  Vinay Majjigi

IPC分类号： H04W88/06

CPC分类号： H04W76/27 ,  H04W24/00 ,  H04W48/18 ,  H04W68/00 ,  H04W88/06

摘要： Electronic devices may be provided that contain wireless communication circuitry. The wireless communication circuitry may include radio-frequency transceiver circuitry coupled to antennas. An electronic device may include a baseband processor and other storage and processing circuitry that implements protocol stacks for handling multiple radio access technologies. The storage and processing circuitry may use the transceiver circuitry to convey data using a first radio access technology while periodically interrupting the conveying of the data to monitor a paging channel using a second radio access technology. In performing the paging channel monitoring operations, the storage and processing circuitry may enforce a time limit that ensures that operations using the first radio access technology are not disrupted more than desired.

摘要翻译： 可以提供包含无线通信电路的电子设备。 无线通信电路可以包括耦合到天线的射频收发器电路。 电子设备可以包括基带处理器和实现用于处理多个无线电接入技术的协议栈的其他存储和处理电路。 存储和处理电路可以使用收发器电路使用第一无线电接入技术传送数据，同时周期性地中断数据的传送以使用第二无线电接入技术监视寻呼信道。 在执行寻呼信道监视操作时，存储和处理电路可以强制执行时间限制，确保使用第一无线电接入技术的操作不会超出所期望的中断。

公开(公告)号：US20120281553A1

公开(公告)日：2012-11-08

申请号：US13099081

申请日：2011-05-02

申请人： Syed A. Mujtaba ,  Youngjae Kim ,  Bharath Narasimha Rao ,  Kee-Bong Song ,  Xiaowen Wang

发明人： Syed A. Mujtaba ,  Youngjae Kim ,  Bharath Narasimha Rao ,  Kee-Bong Song ,  Xiaowen Wang

IPC分类号： H04W24/00

CPC分类号： H04M1/72519 ,  H01Q1/243 ,  H01Q21/28 ,  H04W68/00

摘要： Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry coupled to multiple antennas. An electronic device may alternate between a sleep mode and a wake mode. During wake mode, the electronic device may monitor a paging channel in a wireless network for incoming paging signals. The device may use either a single antenna mode or a multiple antenna mode such as a dual antenna mode in monitoring the paging channel. In the single antenna mode, a single active antenna is used to receive paging signals. In the dual antenna mode two antennas are simultaneously used to receive paging signals. The device may choose which antenna mode to use based on signal quality measurements and history information on successfully received paging signals.

摘要翻译： 可以提供包含无线通信电路的电子设备。 无线通信电路可以包括耦合到多个天线的射频收发器电路。 电子设备可以在睡眠模式和唤醒模式之间交替。 在唤醒模式期间，电子设备可以监视无线网络中的呼入寻呼信号的寻呼信道。 该设备可以使用单天线模式或多天线模式，例如双天线模式来监视寻呼信道。 在单天线模式中，单个有源天线用于接收寻呼信号。 在双天线模式中，两个天线同时用于接收寻呼信号。 设备可以基于信号质量测量和成功接收的寻呼信号的历史信息来选择要使用的天线模式。

公开(公告)号：US08194771B2

公开(公告)日：2012-06-05

申请号：US10990143

申请日：2004-11-16

申请人： Joachim S. Hammerschmidt ,  Robert John Kopmeiners ,  Xiaowen Wang

发明人： Joachim S. Hammerschmidt ,  Robert John Kopmeiners ,  Xiaowen Wang

IPC分类号： H04B7/02

CPC分类号： H04L1/06 ,  H04B7/0671

摘要： A method and apparatus are disclosed for transmitting symbols in a multiple antenna communication system. The disclosed frame structure comprises a preamble having a plurality of long training symbols that are transmitted on a plurality transmit antennas. At least a portion of the frame is delayed on at least one transmit antenna. The disclosed frame formats of the present invention are backwards compatible to existing single antenna communication systems. The delay amount, D, can be approximately equal to one OFDM time sample period, T. The delayed version can be obtained by introducing a time delay into a signal on the delayed branch(es) or by cyclically shifting at least a portion of each frame on the delayed branch(es). The entire frame or only the preamble portion of each frame can be delayed.

摘要翻译： 公开了用于在多天线通信系统中发送符号的方法和装置。 所公开的帧结构包括具有在多个发射天线上发射的多个长训练符号的前同步码。 帧的至少一部分在至少一个发射天线上被延迟。 所公开的本发明的帧格式向后兼容于现有的单一天线通信系统。 延迟量D可以近似等于一个OFDM时间采样周期T.延迟版本可以通过在延迟分支上的信号中引入时间延迟或者通过周期性地移位每个 在延迟分支上的框架。 每个帧的整个帧或仅前导码部分可以被延迟。

公开(公告)号：US20090245408A1

公开(公告)日：2009-10-01

申请号：US12249739

申请日：2008-10-10

申请人： Syed Aon Mujtaba ,  Xiaowen Wang

发明人： Syed Aon Mujtaba ,  Xiaowen Wang

IPC分类号： H04B7/02

CPC分类号： H04B7/0417 ,  H04B7/0632 ,  H04B7/0639 ,  H04B7/068 ,  H04B7/0689 ,  H04L1/0016

摘要： A Channel Quality Indicator table for wireless multiple input multiple output (MIMO) networks is disclosed. In one embodiment, a method of generating a table for channel quality indicator (CQI) for an open loop MIMO transmission includes calculating performance of a link between a transmitter and a user end unit for each MIMO transmission mode over a range of average signal-to-noise ratio, and selecting the MIMO transmission mode that maximizes performance for each subset of the range of average signal-to-noise ratio. The method further includes storing the selected MIMO transmission mode and the corresponding subset of the range of average signal-to-noise ratio in a CQI table, the CQI table being stored in an user end unit and a base transceiver station of the open loop MIMO network.

摘要翻译： 公开了一种用于无线多输入多输出（MIMO）网络的信道质量指标表。 在一个实施例中，生成用于开环MIMO传输的信道质量指示符（CQI）的表的方法包括：在平均信号到平均信号的范围内，针对每个MIMO传输模式来计算发射机和用户端单元之间的链路的性能 并且选择使平均信噪比范围的每个子集的性能最大化的MIMO传输模式。 该方法还包括将所选择的MIMO传输模式和平均信噪比范围的相应子集存储在CQI表中，该CQI表被存储在开环MIMO的用户端单元和基站中 网络。

公开(公告)号：US20090092038A1

公开(公告)日：2009-04-09

申请号：US11866812

申请日：2007-10-03

申请人： Syed Mujtaba ,  Xiaowen Wang

发明人： Syed Mujtaba ,  Xiaowen Wang

IPC分类号： H04J11/00

CPC分类号： H04L27/2678 ,  H04L5/0007 ,  H04L27/2662

摘要： In one embodiment, a timing-offset estimator calculates a correlation value for each sample of an OFDM signal having a cyclic prefix for each OFDM symbol. The correlation value is provided to a tapped delay line that applies a separate weight to each of 2V correlation values, where V is the length of the cyclic prefix and the weights are based on a triangular weighting scheme that increases linearly from the first value, peaks at the Vth value, and decreases linearly to the 2Vth value. A stream of combined, squared correlation values is generated by combining and squaring the 2V weighted correlation values for each sample of the OFDM signal. For each cyclic prefix of the OFDM signal, a timing-offset estimate is determined based on a detected peak value in the stream of combined, squared correlation values. A timing-offset estimator with triangular weighting scheme may be implemented using recursive processing.

摘要翻译： 在一个实施例中，定时偏移估计器针对每个OFDM符号具有循环前缀的OFDM信号的每个样本计算相关值。 将相关值提供给一个抽头延迟线，该延迟线对2V相关值中的每一个施加单独的加权，其中V是循环前缀的长度，权重基于从第一个值线性增加的三角加权方案，峰值 在Vth值处，并且线性地减小到第2Vth值。 通过组合和平方OFDM信号的每个样本的2V加权相关值来产生组合的平方相关值的流。 对于OFDM信号的每个循环前缀，基于组合的平方相关值的流中的检测到的峰值来确定定时偏移估计。 具有三角加权方案的定时偏移估计器可以使用递归处理来实现。

公开(公告)号：US08718667B2

公开(公告)日：2014-05-06

申请号：US13555083

申请日：2012-07-21

申请人： Kee-Bong Song ,  Xiaowen Wang ,  Syed A. Mujtaba

发明人： Kee-Bong Song ,  Xiaowen Wang ,  Syed A. Mujtaba

IPC分类号： H04W74/00

CPC分类号： H04W74/0833 ,  H04B17/318 ,  H04W52/146 ,  H04W52/241 ,  H04W52/367 ,  H04W52/48 ,  H04W52/50

摘要： A mobile wireless device adapts transmit power levels and number of retransmissions of a preamble sent to a wireless network. The mobile wireless device measures characteristics of a downlink signal received from the wireless network. The mobile wireless device transmits a series of preambles to the wireless network, each successive preamble having an increased power level, starting at a power level based on the measured received signal characteristics and on parameters received from the wireless network, up to a maximum transmit power level. When the transmit power level of the preamble exceeds the maximum transmit power level and when the measured downlink signal quality falls below a threshold, the mobile wireless device limits the number of preamble retransmission to less than an allowed maximum number of retransmissions. A minimum number of retransmissions is determined and adapted to higher values for larger measured values of downlink signal quality.

摘要翻译： 移动无线设备适配发送功率电平和发送到无线网络的前导码的重传次数。 移动无线设备测量从无线网络接收的下行链路信号的特性。 移动无线设备向无线网络发送一系列前导码，每个连续的前同步码具有增加的功率电平，从基于所测量的接收信号特性的功率电平和从无线网络接收的参数开始，直到最大发射功率 水平。 当前导码的发射功率电平超过最大发射功率电平时，并且当所测量的下行链路信号质量低于阈值时，移动无线设备将前导码重传的数量限制为小于允许的最大重发次数。 确定最小重传次数并适应较大的下行链路信号质量测量值的值。