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127 条记录 (耗时 0.067 秒)

    Method and apparatus for pre-coding frequency division duplexing system
    1.
    发明授权
    Method and apparatus for pre-coding frequency division duplexing system 有权
    预编码分频双工系统的方法和装置

    公开(公告)号：US09172453B2

    公开(公告)日：2015-10-27

    申请号：US11261064

    申请日：2005-10-27

    申请人： Jibing Wang ,  Tamer Kadous ,  Dhananjay Ashok Gore

    发明人： Jibing Wang ,  Tamer Kadous ,  Dhananjay Ashok Gore

    IPC分类号： H04J1/00 ,  H04B7/06

    CPC分类号： H04B7/0639 ,  H04B7/063

    摘要： Accordingly, a method and apparatus are provided wherein a receiver system selects a pre-coding matrix, comprising eigen-beamforming weights, to use and provides rank value and matrix index associated with the selected matrix to the transmitter system. The transmitter system upon receiving the rank value and matrix index, determine if the matrix associated with the matrix index provided by the receiver system can be used. If not, them transmitter system selects another matrix for determining eigen-beamforming weights.

    摘要翻译： 因此，提供了一种方法和装置，其中接收机系统选择包括特征波束形成权重的预编码矩阵，以使用并向发射机系统提供与所选矩阵相关联的秩值和矩阵索引。 发射机系统在接收到秩值和矩阵索引后，确定是否可以使用与接收机系统提供的矩阵索引关联的矩阵。 如果不是，则它们发射机系统选择用于确定特征波束形成权重的另一矩阵。

    Precoding and SDMA support
    2.
    发明授权
    Precoding and SDMA support 有权
    预编码和SDMA支持

    公开(公告)号：US09136974B2

    公开(公告)日：2015-09-15

    申请号：US11401979

    申请日：2006-04-10

    申请人： Alexei Gorokhov ,  Dhananjay Ashok Gore ,  Gwendolyn D. Barriac ,  Jibing Wang ,  Tamer Kadous

    发明人： Alexei Gorokhov ,  Dhananjay Ashok Gore ,  Gwendolyn D. Barriac ,  Jibing Wang ,  Tamer Kadous

    IPC分类号： H04W72/00 ,  H04L1/00 ,  H04W72/04 ,  H04B7/04 ,  H04B7/06 ,  H04L1/06

    CPC分类号： H04L1/0001 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0639 ,  H04B7/0663 ,  H04B7/0689 ,  H04L1/06 ,  H04W72/04

    摘要： Embodiments are described in connection with enhancing performance in a wireless communication system using codebook technology. According to an embodiment is a method for enhancing performance in a wireless communication environment. The method can include receiving a user preference for a transmission mode, associating the user preference with an entry or entries in a codebook, and assigning the user to a transmission mode corresponding to the entry or entries. The transmission mode can be one of a precoding, space division multiple access (SDMA), SDMA precoding, multiple input multiple output (MIMO), MIMO precoding, MIMO-SDMA and a diversity. Each entry can correspond to a transmission mode.

    摘要翻译： 结合增强使用码本技术的无线通信系统中的性能来描述实施例。 根据实施例是用于增强无线通信环境中的性能的方法。 该方法可以包括接收用户对传输模式的偏好，将用户偏好与码本中的条目或条目相关联，并将用户分配给与条目或条目相对应的传输模式。 传输模式可以是预编码，空分多址（SDMA），SDMA预编码，多输入多输出（MIMO），MIMO预编码，MIMO-SDMA和分集之一。 每个条目可以对应于传输模式。

    Precoding for segment sensitive scheduling in wireless communication systems
    3.
    发明授权
    Precoding for segment sensitive scheduling in wireless communication systems 有权
    无线通信系统中片段敏感调度的预编码

    公开(公告)号：US08639190B2

    公开(公告)日：2014-01-28

    申请号：US11553870

    申请日：2006-10-27

    申请人： Dhananjay Ashok Gore ,  Hemanth Sampath ,  Jibing Wang ,  Tamer Kadous ,  Gwendolyn D. Barriac

    发明人： Dhananjay Ashok Gore ,  Hemanth Sampath ,  Jibing Wang ,  Tamer Kadous ,  Gwendolyn D. Barriac

    IPC分类号： H04B1/00

    CPC分类号： H04B7/0456 ,  H04L1/0016 ,  H04L1/0026 ,  H04L1/0675 ,  H04L5/023 ,  H04L25/0206 ,  H04L27/2602 ,  H04L27/2608

    摘要： Techniques to enhance the performance in a wireless communication system using segments called subbands and using precoding are shown. According to one aspect, the bandwidth for transmission to an access terminal is constrained to a preferred bandwidth which is less than the bandwidth available for transmission to an access terminal and precoding information related to the subcarriers within the constrained bandwidth is provided to a transmitter. The precoding information related to the subcarriers within a constrained bandwidth provides feedback about the forward link channel properties relative to different subbands and may be fed back on a channel associated with the bandwidth.

    摘要翻译： 示出了使用称为子带并使用预编码的段来增强在无线通信系统中的性能的技术。 根据一个方面，用于传输到接入终端的带宽被限制到比可用于传输到接入终端的带宽的优选带宽，并且将与受限带宽内的子载波相关的预编码信息提供给发射机。 与受限带宽内的子载波相关的预编码信息提供关于相对于不同子带的前向链路信道属性的反馈，并且可以在与带宽相关联的信道上反馈。

    METHOD AND APPARATUS FOR ANTENNA DIVERSITY IN MULTI-INPUT MULTI-OUTPUT COMMUNICATION SYSTEMS
    5.
    发明申请
    METHOD AND APPARATUS FOR ANTENNA DIVERSITY IN MULTI-INPUT MULTI-OUTPUT COMMUNICATION SYSTEMS 有权
    多输入多输出通信系统中天线多样性的方法与装置

    公开(公告)号：US20120120925A1

    公开(公告)日：2012-05-17

    申请号：US13271121

    申请日：2011-10-11

    申请人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

    发明人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

    IPC分类号： H04W72/04

    CPC分类号： H04L5/0023 ,  H04B7/0456 ,  H04B7/061 ,  H04B7/0671 ,  H04B7/0691 ,  H04B7/0697 ,  H04L27/2602

    摘要： Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g, based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.

    摘要翻译： 描述了可以灵活地实现期望的空间复用顺序，空间分集顺序和信道估计开销顺序的传输方案。 对于数据传输，确定接收机的分配子载波和空间复用顺序（M），其中M≥1。 对于每个分配的子载波，从由正交矩阵的V列形成的V个虚拟天线中选择M个虚拟天线，其中V≥M。 可以选择V以实现期望的空间分集顺序和信道估计开销顺序。 通过应用正交矩阵将输出符号映射到为每个分配的副载波选择的M个虚拟天线。 导频符号也映射到V虚拟天线。 映射的符号被提供用于从T发射天线发射，其中T≥V。 为映射符号生成传输符号，例如基于OFDM或SC-FDMA。 可以对T发射天线应用不同的循环延迟以改善分集。

    PILOT TRANSMISSION AND CHANNEL ESTIMATION FOR MULTIPLE TRANSMITTERS
    6.
    发明申请
    PILOT TRANSMISSION AND CHANNEL ESTIMATION FOR MULTIPLE TRANSMITTERS 审中-公开
    多台发射机的导频传输和信道估计

    公开(公告)号：US20080112495A1

    公开(公告)日：2008-05-15

    申请号：US11873375

    申请日：2007-10-16

    申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Tamer Kadous

    发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Tamer Kadous

    IPC分类号： H04K1/10

    CPC分类号： H04L25/0204 ,  H04L25/0212 ,  H04L25/0226 ,  H04L27/261

    摘要： Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal, and/or cyclic-shift codes. To obtain a channel estimate for a transmitter using a time-frequency pilot code composed of a time-only code and a frequency-only code, a receiver multiplies a set of received symbols for each symbol period with a set of code values for the frequency-only code to obtain a set of detected symbols and performs an IDFT on the set of detected symbols to obtain an initial impulse response estimate. The receiver performs code matching on multiple initial impulse response estimates derived for multiple symbol periods with the time-only code to obtain a final impulse response estimate for the desired transmitter. The receiver retains the first L channel taps and zeroes out remaining channel taps, where L is the expected channel length.

    摘要翻译： 为每个发射机分配一个仅时间导频码，仅频率导频码或用于导频传输的时频导频码。 导频码可以是伪随机，正交和/或循环移位码。 为了使用由时间唯一码和仅频率码构成的时频导频码来获得用于发射机的信道估计，接收机将用于每个符号周期的一组接收符号与频率的一组码值相乘 - 获得一组检测符号的代码，并对检测符号集合执行IDFT以获得初始脉冲响应估计。 接收机对具有多个符号周期的多个初始脉冲响应估计执行码匹配，其中仅使用时间码来获得所需发射机的最终脉冲响应估计。 接收器保留第一个L个通道抽头，并将剩余的通道抽头置零，其中L是预期的通道长度。

    Pilot transmission and channel estimation for multiple transmitters
    10.
    发明授权
    Pilot transmission and channel estimation for multiple transmitters 失效
    多个发射机的导频传输和信道估计

    公开(公告)号：US07418046B2

    公开(公告)日：2008-08-26

    申请号：US11022146

    申请日：2004-12-22

    申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Tamer Kadous

    发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Tamer Kadous

    IPC分类号： H04K1/10 ,  H04L27/28

    CPC分类号： H04L25/0204 ,  H04L25/0212 ,  H04L25/0226 ,  H04L27/261

    摘要： Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal, and/or cyclic-shift codes. To obtain a channel estimate for a transmitter using a time-frequency pilot code composed of a time-only code and a frequency-only code, a receiver multiplies a set of received symbols for each symbol period with a set of code values for the frequency-only code to obtain a set of detected symbols and performs an IDFT on the set of detected symbols to obtain an initial impulse response estimate. The receiver performs code matching on multiple initial impulse response estimates derived for multiple symbol periods with the time-only code to obtain a final impulse response estimate for the desired transmitter. The receiver retains the first L channel taps and zeroes out remaining channel taps, where L is the expected channel length.

    摘要翻译： 为每个发射机分配一个仅时间导频码，仅频率导频码或用于导频传输的时频导频码。 导频码可以是伪随机，正交和/或循环移位码。 为了使用由时间唯一码和仅频率码构成的时频导频码来获得用于发射机的信道估计，接收机将用于每个符号周期的一组接收符号与频率的一组码值相乘 - 获得一组检测符号的代码，并对检测符号集合执行IDFT以获得初始脉冲响应估计。 接收机对具有多个符号周期的多个初始脉冲响应估计执行码匹配，其中仅使用时间码来获得所需发射机的最终脉冲响应估计。 接收器保留第一个L个通道抽头，并将剩余的通道抽头置零，其中L是预期的通道长度。