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    • 11. 发明授权
    • System and method for precoding in a multiple-input multiple-output (MIMO) system
    • 用于多输入多输出(MIMO)系统中预编码的系统和方法
    • US07813458B2
    • 2010-10-12
    • US11573940
    • 2005-08-19
    • Nico van WaesHua ZhangJuha HeiskalaVictor StolpmanJian Zhong ZhangTony ReidJae Son
    • Nico van WaesHua ZhangJuha HeiskalaVictor StolpmanJian Zhong ZhangTony ReidJae Son
    • H04B7/10
    • H04L1/0637H04B7/0413H04B7/0456H04B7/0617H04B7/0619H04L1/0675
    • A network entity in a multi-transmit antenna system, such as a transmitting or receiving entity, includes a component such as a pre-coder or a receiver, and is configured for full-spatial-rate coding data. The network entity is capable of providing a full-spatial-rate codebook having been designed by selecting an underlying partial-spatial-rate codebook designed for a system configured for partial-spatial-rate coding data. The full-spatial-rate codebook can then be designed in a manner including defining the full-spatial-rate codewords based upon partial-spatial-rate codewords of the partial-spatial rate codebook and basis vectors of a null space of the respective partial-spatial-rate codewords in a multidimensional vector space. The network entity can also be capable of selecting codewords of the codebook in accordance with a sub-space tracking method whereby the codewords of the codebook can be selected in a manner that exploits correlations therebetween.
    • 诸如发送或接收实体的多发射天线系统中的网络实体包括诸如预编码器或接收机的组件,并且被配置用于全空间速率编码数据。 网络实体能够提供通过选择为配置用于部分空间速率编码数据的系统而设计的底层部分空间速率码本来设计的全空间速率码本。 然后可以以包括基于部分空间速率码本的部分空间率码字定义全空间速率码字的方式来设计全空间速率码本以及各部分空间速率码本的零空间的基向量, 多维向量空间中的空间速率码字。 网络实体还可以根据子空间跟踪方法来选择码本的码字,由此可以以利用它们之间的相关性的方式来选择码本的码字。
    • 13. 发明申请
    • Lower complexity computation of lattice reduction
    • 较低的复杂度计算晶格约简
    • US20070268981A1
    • 2007-11-22
    • US11439040
    • 2006-05-22
    • Juha Heiskala
    • Juha Heiskala
    • H04L1/02
    • H04L1/06H04L1/005H04L25/0204
    • A signal vector is received over a plurality of channels. A channel matrix H is determined that represents at least one of the plurality of channels. An iterative algorithm such as Lenstra-Lenstra-Lovasz is used to determining a change of basis matrix T that when multiplied with the channel matrix H converges to a matrix H*T that is more orthogonal than the channel matrix H. In one aspect the iterative algorithm is upwardly bounded in the number of iterations (e.g., 20 or 30 iterations) that it may perform for any specific channel realization to determine the change of basis matrix T. In another aspect the algorithm is initiated with a matrix derived from a previously determined change of basis matrix. Both aspects may be combined in a single method or device, or either employed separately.
    • 在多个信道上接收信号矢量。 确定表示多个通道中的至少一个的通道矩阵H. 迭代算法如Lenstra-Lenstra-Lovasz用于确定当与信道矩阵H相乘时的基矩阵T的变化收敛于比信道矩阵H更正交的矩阵H * T。在一个方面,迭代 算法以对于任何特定信道实现来执行的迭代次数(例如,20或30次迭代)向上是有限的,以确定基矩阵T的变化。另一方面,该算法是用从先前确定的矩阵 基矩阵变化。 两个方面可以组合在单个方法或装置中,或者单独使用。