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    • 1. 发明申请
    • METHODS FOR TRANSMIT ANTENNA SWITCHING DURING UPLINK ACCESS PROBING
    • 在上行链路访问探测中发送天线切换的方法
    • WO2013019718A1
    • 2013-02-07
    • PCT/US2012/048836
    • 2012-07-30
    • APPLE INC.MUJTABA, Syed A.KIM, YoungjaeSONG, Kee-BongWANG, Xiaowen
    • MUJTABA, Syed A.KIM, YoungjaeSONG, Kee-BongWANG, Xiaowen
    • H04B7/06H04W52/50H04B7/04
    • H04W52/50H04B7/0404H04B7/0604
    • Electronic devices are be provided that contain wireless communication circuitry. The wireless communication circuitry includes radio-frequency transceiver circuitry coupled to first and second antennas. An electronic device sends network access probe signals to a base station in a wireless network. If the base station responds with a corresponding acknowledgement, the electronic device and base station establish a wireless communication link such as a cellular telephone link. In response to failure to receive the acknowledgement signal from the base station, the electronic device increases the transmit power of a successive network access probe signal. The electronic device switchs between use of the first and second antennas when transmitting the network access probe signals. The electronic device alternates between the first and second antennas or uses other antenna usage patterns.
    • 提供包含无线通信电路的电子设备。 无线通信电路包括耦合到第一和第二天线的射频收发器电路。 电子设备向无线网络中的基站发送网络接入探测信号。 如果基站用相应的确认进行响应,则电子设备和基站建立诸如蜂窝电话链路的无线通信链路。 响应于不能从基站接收确认信号,电子设备增加了连续网络接入探测信号的发射功率。 当发送网络接入探测信号时,电子设备在使用第一和第二天线之间切换。 电子设备在第一和第二天线之间交替,或者使用其它天线使用模式。
    • 5. 发明申请
    • ADAPTIVE RANDOM ACCESS CHANNEL RETRANSMISSION
    • 自适应随机访问信道重传
    • WO2013022774A2
    • 2013-02-14
    • PCT/US2012/049578
    • 2012-08-03
    • APPLE INC.SONG, Kee-bongWANG, XiaowenMUJTABA, Syed, Aon
    • SONG, Kee-bongWANG, XiaowenMUJTABA, Syed, Aon
    • H04W74/08
    • H04W74/0833H04B17/318H04W52/146H04W52/241H04W52/367H04W52/48H04W52/50
    • 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.
    • 移动无线设备适配发送到无线网络的前导码的发送功率电平和重传次数。 移动无线设备测量从无线网络接收的下行链路信号的特征。 移动无线设备向无线网络发送一系列前导码,每个连续的前导码具有增加的功率电平,从基于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并且当测量的下行链路信号质量下降到阈值以下时,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。 对于下行链路信号质量的较大测量值,确定最小重传次数并将其调整为较高值。
    • 7. 发明申请
    • METHOD FOR SELECTING CONSTELLATION ROTATION ANGLES FOR QUASI-ORTHOGONAL SPACE-TIME AND SPACE-FREQUENCY BLOCK CODING
    • 选择正交正交空间时间和空间频率编码的坐标旋转角度的方法
    • WO2008137443A1
    • 2008-11-13
    • PCT/US2008/061954
    • 2008-04-30
    • AGERE SYSTEMS INC.MUJTABA, SyedWANG, Xiaowen
    • MUJTABA, SyedWANG, Xiaowen
    • G06F11/00
    • H04L1/0643H04L1/0606
    • In one embodiment, the present invention generates a single rotation angle that may be used to maximize diversity of a quasi-orthogonal space-time block code that encodes groups of four data symbols. Two rotation angles corresponding the first two data symbols in a group are set to zero, and two rotation angles corresponding to the second two data symbols in a group are set to a single initial value. A codeword distance matrix is determined for each possible combination of codewords and erroneously decoded codewords that may be generated using the initial rotation angle, and the minimum of the determinants of these matrices is selected. This process is repeated to generate a plurality of minimum determinants, and, for each iteration, a different single rotation angle corresponding to the second two data symbols is used. Then, a single rotation angle is selected that corresponds to the maximum of the minimum determinants.
    • 在一个实施例中,本发明产生单个旋转角度,其可用于最大化对四个数据符号组进行编码的准正交空时块代码的分集。 对应于组中的前两个数据符号的两个旋转角度被设置为零,并且与组中的第二两个数据符号相对应的两个旋转角度被设置为单个初始值。 针对可能使用初始旋转角度生成的码字和错误解码的码字的每个可能组合来确定码字距离矩阵,并且选择这些矩阵的最小值。 重复该过程以产生多个最小决定因素,并且对于每个迭代,使用与第二两个数据符号相对应的不同的单个旋转角度。 然后,选择对应于最小决定因素的最大值的单个旋转角度。
    • 8. 发明申请
    • METHODS AND APPARATUS FOR PARAMETRIC ESTIMATION IN A MULTIPLE ANTENNA COMMUNICATION SYSTEM
    • 多天线通信系统中参数估计的方法与装置
    • WO2006055018A1
    • 2006-05-26
    • PCT/US2005/003924
    • 2005-01-27
    • AGERE SYSTEMS INC.KRIEDTE, Kai RolandMUJTABA, Syed, AonWANG, Xiaowen
    • KRIEDTE, Kai RolandMUJTABA, Syed, AonWANG, Xiaowen
    • H04B7/08H04L12/28H04L27/00
    • H04L27/2613H04B7/0684H04L1/0046H04L1/0061
    • Methods and apparatus are disclosed for processing received data in a multiple input multiple output (MIMO) communication system. A multiple antenna receiver can distinguish a MIMO transmission from other transmissions based on the detection of a predefined symbol following a legacy portion of a preamble. A preamble comprises a legacy portion and an extended portion. The legacy portion is comprised of a first long preamble followed by a first signal field and may be processed by both multiple antenna receivers and legacy receivers. The extended portion comprises the predefined symbol following the first signal field from the legacy portion. If the predefined symbol is a second long preamble, a MIMO transmission is detected by performing a correlation on the preamble to detect the second long preamble. If the predefined symbol is a second long signal field, a MIMO transmission is detected by performing a cyclic redundancy check to detect the second long signal field.
    • 公开了用于处理多输入多输出(MIMO)通信系统中的接收数据的方法和装置。 多天线接收机可以基于在前导码的遗留部分之后的预定符号的检测来区分MIMO传输与其他传输。 前导码包括传统部分和扩展部分。 遗留部分由第一长前导跟随第一信号场组成,并且可以由多个天线接收机和传统接收机两者来处理。 扩展部分包括来自遗留部分的第一信号字段之后的预定符号。 如果预定义符号是第二长前导码,则通过对前导码执行相关性来检测MIMO传输以检测第二长前导码。 如果预定符号是第二长信号字段,则通过执行循环冗余校验来检测第二长信号字段来检测MIMO传输。