Apparatus and method for measuring noise power in a CDMA mobile communication system
    17.
    发明授权
    Apparatus and method for measuring noise power in a CDMA mobile communication system 失效
    CDMA移动通信系统中用于测量噪声功率的装置和方法

    公开(公告)号:US06822998B1

    公开(公告)日:2004-11-23

    申请号:US09663643

    申请日:2000-09-18

    IPC分类号: H04B169

    摘要: A noise power measuring system and method for a base station receiver are disclosed. In the system and method, a received signal is despread and the noise power of the despread received signal is estimated. An orthogonal code generator generates a noise power measurement orthogonal code, which is orthogonal to all the orthogonal codes presently being used by the mobile station. A correlator connected to the orthogonal code generator performs a correlation operation between the noise power measurement orthogonal code and the despread received signal. A noise power measurer connected to the correlator, measures the noise power from the output of the correlator.

    摘要翻译: 公开了一种用于基站接收机的噪声功率测量系统和方法。 在系统和方法中,对接收到的信号进行解扩,并且估计解扩的接收信号的噪声功率。 正交码发生器产生噪声功率测量正交码,其与当前正在由移动台使用的所有正交码正交。 连接到正交码发生器的相关器执行噪声功率测量正交码和解扩后的接收信号之间的相关运算。 连接到相关器的噪声功率测量器,测量相关器输出端的噪声功率。

    Method and apparatus for generating preambles in a broadband wireless communication system using multiple antennas
    19.
    发明授权
    Method and apparatus for generating preambles in a broadband wireless communication system using multiple antennas 有权
    在使用多个天线的宽带无线通信系统中产生前同步码的方法和装置

    公开(公告)号:US07394793B2

    公开(公告)日:2008-07-01

    申请号:US11077853

    申请日:2005-03-11

    IPC分类号: H04B7/216

    摘要: A preamble generation method and apparatus are provided for improving transmit diversity by changing a preamble structure in a broadband wireless communication system using multiple antennas based on a multiple input multiple output (MIMO) scheme. First pilot tones associated with different antennas are selected. The first pilot tones are multiplied by different first Walsh codes. Second pilot tones associated with the same antenna are sequentially selected along a frequency axis. The second pilot tones are multiplied by a second Walsh code. Preambles are generated by assigning, to at least two symbol durations, output signals multiplied by the first and second Walsh codes. Consecutive pilot tones during each of the at least two symbol durations are spaced by one pilot tone, and code streams of the first and second Walsh codes are alternately multiplied by the pilot tones. The preamble structure has orthogonality between the antennas using frequency, time and code domains.

    摘要翻译: 提供了一种前导码生成方法和装置,用于通过基于多输入多输出(MIMO)方案通过使用多个天线改变宽带无线通信系统中的前导码结构来改善发送分集。 选择与不同天线相关联的第一导频音调。 第一导频音乘以不同的第一沃尔什码。 沿着频率轴依次选择与相同天线相关联的第二导频音。 第二个导频音乘以第二个沃尔什码。 通过将至少两个符号持续时间分配给乘以第一和第二沃尔什码的输出信号来产生前导码。 在至少两个符号持续时间中的每一个期间的连续导频音调间隔一个导频音,并且第一和第二沃尔什码的码流交替地乘以导频音。 前导码结构在使用频率,时间和码域的天线之间具有正交性。