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    Wireless access modem having downstream channel resynchronization method
    2.
    发明授权
    Wireless access modem having downstream channel resynchronization method 有权
    具有下行信道重新同步方式的无线接入调制解调器

    公开(公告)号：US07120854B2

    公开(公告)日：2006-10-10

    申请号：US10643119

    申请日：2003-08-18

    申请人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael O. Polley

    发明人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael O. Polley

    IPC分类号： H03M13/00 ,  H04L5/16

    CPC分类号： H04W56/009 ,  H04L7/048 ,  H04L7/10 ,  H04W24/00 ,  H04W74/00

    摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and the MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoder and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method for resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.

    摘要翻译： 一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。 第二装置包括具有RS锁定指示器的里德所罗门（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监测RS和MPI锁定指示符。 由RS和MPI锁指示符的值定义的四种不同状态确定数据通信系统是否将等待RS解码器和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行 执行整个信道获取算法。 本文所述的用于重新同步的方法在预定时间内恢复同步，而不具有物理链路层之上的层具有知识。

    Linearly independent preambles for MIMO channel estimation with backward compatibility
    3.
    发明授权
    Linearly independent preambles for MIMO channel estimation with backward compatibility 有权
    用于具有向后兼容性的MIMO信道估计的线性独立前导码

    公开(公告)号：US07522674B2

    公开(公告)日：2009-04-21

    申请号：US10884363

    申请日：2004-07-02

    申请人： Srinath Hosur ,  Michael O. Polley ,  Manish Goel

    发明人： Srinath Hosur ,  Michael O. Polley ,  Manish Goel

    IPC分类号： H04B7/04 ,  H04L27/28

    CPC分类号： H04L1/0083 ,  H04B7/0678 ,  H04L7/041 ,  H04L7/06 ,  H04L27/2613

    摘要： A device and a method of characterizing a communications channel. The method includes transmitting a first part of a packet preamble using two or more antennas and transmitting a second part of the packet preamble using the two or more antennas. Each antenna transmits an orthogonal encoding of the second part of the packet preamble. The method also includes transmitting a packet header using the two or more antennas and transmitting a packet payload using the two or more antennas. Each antenna transmits an orthogonal encoding of the packet header. The packet payload may be encoded across the transmissions of the two or more antennas.

    摘要翻译： 一种表征通信信道的设备和方法。 该方法包括使用两个或多个天线发送分组前导码的第一部分，并使用两个或更多个天线发送分组前导码的第二部分。 每个天线发送分组前同步码的第二部分的正交编码。 该方法还包括使用两个或多个天线发送分组报头，并使用两个或更多个天线发送分组有效载荷。 每个天线发送分组报头的正交编码。 分组有效载荷可以跨越两个或更多个天线的传输进行编码。

    Circuit for computing the absolute value of complex numbers
    4.
    发明授权
    Circuit for computing the absolute value of complex numbers 有权
    用于计算复数绝对值的电路

    公开(公告)号：US06999981B2

    公开(公告)日：2006-02-14

    申请号：US10057137

    申请日：2002-01-25

    申请人： Manish Goel ,  Srinath Hosur ,  Michael O. Polley

    发明人： Manish Goel ,  Srinath Hosur ,  Michael O. Polley

    IPC分类号： G06F7/00 ,  G06F7/38

    CPC分类号： G06F7/552 ,  G06F7/4806

    摘要： An apparatus (100) for computing the absolute value of a complex number includes separate squaring units (110, 115) for the real and imaginary parts. A square root unit (130) extracts the square root of the sum (120) of these squares, which is absolute value of the complex number. Each squaring unit includes one unsigned multipliers for respective least significant and two signed multipliers for respective most significant bits and a cross term. The products are aligned by shifting and summed. The square root unit employs identical processing elements, each considering two bits of the input and forming one root bit and a remainder. Each processing element compares two intermediate test variables, and selects a “1” or “0” for the root bit and the next remainder based upon this comparison. A chain of processing elements enables computation of the root to the desired precision. Alternatively, the same processing elements may be used in a recirculating manner.

    摘要翻译： 用于计算复数的绝对值的装置（100）包括用于实部和虚部的分立的平方单元（110,115）。 平方根单元（130）提取这些正方形的和（120）的平方根，其是复数的绝对值。 每个平方单元包括用于相应最低有效位的一个无符号乘法器和用于相应最高有效位的两个有符号乘法器和交叉项。 产品通过移位和相加进行对齐。 平方根单元采用相同的处理元件，每个元件考虑输入的两个位，并形成一个根位和余数。 每个处理元件比较两个中间测试变量，并根据该比较为根位选择“1”或“0”。 一系列处理元件能够将根计算到所需的精度。 或者，可以以循环方式使用相同的处理元件。

    Wireless access modem having downstream channel resynchronization method
    5.
    发明授权
    Wireless access modem having downstream channel resynchronization method 有权
    具有下行信道重新同步方式的无线接入调制解调器

    公开(公告)号：US07509565B2

    公开(公告)日：2009-03-24

    申请号：US11470916

    申请日：2006-09-07

    申请人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael O Polley

    发明人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael O Polley

    IPC分类号： H03M13/00 ,  H04L5/16

    CPC分类号： H04W56/009 ,  H04L7/048 ,  H04L7/10 ,  H04W24/00 ,  H04W74/00

    摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoded and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method of resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.

    摘要翻译： 一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。 第二装置包括具有RS锁指示器的Reed Solomon（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监视RS和MPI锁定指示符。 由RS和MPI锁指示器的值定义的四种不同状态确定数据通信系统是否将等待RS解码和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行 执行整个信道获取算法。 本文所述的重新同步的方法在预定时间内恢复同步，而不具有具有知识的物理链路层之上的层。

    Signal field controller, method of controlling and MIMO transmitter employing the same
    7.
    发明授权
    Signal field controller, method of controlling and MIMO transmitter employing the same 有权
    信号场控制器，控制方法和采用该方法的MIMO发射机

    公开(公告)号：US07050768B2

    公开(公告)日：2006-05-23

    申请号：US10744310

    申请日：2003-12-22

    申请人： Srinath Hosur ,  Srikanth Gummadi ,  Michael O. Polley ,  Manish Goel

    发明人： Srinath Hosur ,  Srikanth Gummadi ,  Michael O. Polley ,  Manish Goel

    IPC分类号： H04B1/02

    CPC分类号： H04B7/0689 ,  H04B7/04

    摘要： For use with a multiple-input, multiple-output (MIMO) transmitter, a signal field controller, a method of controlling signal fields and a MIMO transmitter incorporating the controller or the method. In one embodiment, the controller includes: (1) a primary signal field mode indicator configured to cause a primary signal field to indicate a presence of a supplemental signal field and provide the primary signal field to the MIMO transmitter for transmission thereby and (2) a supplemental signal field generator coupled to the primary signal field mode indicator and configured to provide a supplemental signal field to the MIMO transmitter for further transmission thereby only when the primary signal field indicates the presence.

    摘要翻译： 用于多输入多输出（MIMO）发射机，信号场控制器，控制信号场的方法和包含控制器或方法的MIMO发射机。 在一个实施例中，控制器包括：（1）主信号场模式指示符，其被配置为使主信号域指示补充信号场的存在，并将主信号字段提供给MIMO发射机用于传输，以及（2） 辅助信号场发生器，其耦合到主信号场模式指示符并且被配置为仅在主信号字段指示存在时向MIMO发射机提供补充信号字段以进一步发送。

    Method of timing compensation for OFDM-based wireless communication system coded parameter signaling (CPS) decode operations
    8.
    发明授权
    Method of timing compensation for OFDM-based wireless communication system coded parameter signaling (CPS) decode operations 有权
    基于OFDM的无线通信系统编码参数信令（CPS）解码操作的定时补偿方法

    公开(公告)号：US07184499B2

    公开(公告)日：2007-02-27

    申请号：US10438242

    申请日：2003-05-14

    申请人： David P. Magee ,  Srinath Hosur ,  Manish Goel

    发明人： David P. Magee ,  Srinath Hosur ,  Manish Goel

    IPC分类号： H03D1/04

    CPC分类号： H04L27/2662 ,  H04L27/2675

    摘要： A method of determining CPS data in an OFDM-based, wireless communication system resolves the phase angle difference between training tones in a burst without CPS data and training tones in a burst with CPS data and then demodulates the resulting difference phase angles to determine the CPS data. The method achieves timing correction/compensation in CPS decode operations associated with OFDM-based, wireless communication systems.

    摘要翻译： 一种在基于OFDM的无线通信系统中确定CPS数据的方法，用CPS数据解析突发中没有CPS数据和训练音调的脉冲串中的训练音之间的相位角差，然后解调得到的差相位角以确定CPS 数据。 该方法在与基于OFDM的无线通信系统相关联的CPS解码操作中实现定时校正/补偿。