Pseudo eigen-beamforming with dynamic beam selection
    1.
    发明申请
    Pseudo eigen-beamforming with dynamic beam selection 审中-公开
    具有动态波束选择的伪特征波束成形

    公开(公告)号:US20070071147A1

    公开(公告)日:2007-03-29

    申请号:US11454761

    申请日:2006-06-15

    IPC分类号: H04B7/10 H04L27/28

    摘要: Techniques for transmitting data with limited channel information are described. A transmitter (e.g., a base station) obtains channel information for a subset of multiple antennas used for data reception at a receiver (e.g., a terminal). The channel information may include at least one channel response vector for at least one antenna, which is a subset of the multiple antennas at the receiver. The transmitter derives multiple eigenvectors based on the channel information, e.g., using pseudo eigen-beamforming. The transmitter selects at least one eigenvector from among the multiple eigenvectors and transmits data with the selected eigenvector(s). The transmitter may select and use different subsets of eigenvector(s) in different time intervals. The transmitter may arrange the multiple eigenvectors into multiple sets based on their eigenvalues, select at least one set based on a MIMO transmission rank, and select one eigenvector from each set.

    摘要翻译: 描述了用有限信道信息发送数据的技术。 发射机(例如,基站)在接收机(例如,终端))获得用于数据接收的多个天线的子集的信道信息。 信道信息可以包括用于至少一个天线的至少一个信道响应向量,其是接收机处的多个天线的子集。 发射机基于信道信息导出多个特征向量,例如使用伪特征波束形成。 发射机从多个特征向量中选择至少一个特征向量,并用所选择的特征向量发送数据。 发射机可以在不同的时间间隔内选择和使用不同的特征向量子集。 发射机可以基于它们的特征值将多个特征向量排列成多个集合,基于MIMO传输秩选择至少一个集合,并从每个集合中选择一个特征向量。

    PRECODING FOR SEGMENT SENSITIVE SCHEDULING IN WIRELESS COMMUNICATION SYSTEMS
    5.
    发明申请
    PRECODING FOR SEGMENT SENSITIVE SCHEDULING IN WIRELESS COMMUNICATION SYSTEMS 有权
    无线通信系统中分段敏感调度的预测

    公开(公告)号:US20070098099A1

    公开(公告)日:2007-05-03

    申请号:US11553870

    申请日:2006-10-27

    IPC分类号: H04K1/10 H04L1/02

    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。

    Precoding and SDMA support
    6.
    发明申请
    Precoding and SDMA support 有权
    预编码和SDMA支持

    公开(公告)号:US20070049218A1

    公开(公告)日:2007-03-01

    申请号:US11401979

    申请日:2006-04-10

    IPC分类号: H04B1/02 H04B1/66

    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 preceding, space division multiple access (SDMA), SDMA preceding, multiple input multiple output (MIMO), MIMO preceding, 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。 传输模式可以是先前的空分多址(SDMA),前面的SDMA,多输入多输出(MIMO),先前的MIMO,MIMO-SDMA和分集之一。 每个条目可以对应于传输模式。

    Method and apparatus for providing antenna diversity in a wireless communication system
    9.
    发明申请
    Method and apparatus for providing antenna diversity in a wireless communication system 审中-公开
    在无线通信系统中提供天线分集的方法和装置

    公开(公告)号:US20070041457A1

    公开(公告)日:2007-02-22

    申请号:US11261823

    申请日:2005-10-27

    IPC分类号: H04K1/10

    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,从形成有正交矩阵的V列的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。 所映射的符号被提供用于从T个发射天线传输,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。