Circuit for computing the absolute value of complex numbers
    81.
    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

    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。

    Power control with space time transmit diversity
    82.
    发明授权
    Power control with space time transmit diversity 有权
    功率控制与时空发射分集

    公开(公告)号:US06977910B1

    公开(公告)日:2005-12-20

    申请号:US09224401

    申请日:1998-12-31

    摘要: A circuit is designed with a measurement circuit (432). The measurement circuit is coupled to receive a first input signal (903) from a first antenna (128) of a transmitter and coupled to receive a second input signal (913) from a second antenna (130) of the transmitter. Each of the first and second signals is transmitted at a first time. The measurement circuit produces an output signal corresponding to a magnitude of the first and second signals. A control circuit (430) is coupled to receive the output signal and a reference signal. The control circuit is arranged to produce a control signal at a second time in response to a comparison of the output signal and the reference signal.

    摘要翻译: 电路设计有测量电路(432)。 测量电路被耦合以从发射机的第一天线(128)接收第一输入信号(903),并被耦合以从发射机的第二天线(130)接收第二输入信号(913)。 第一和第二信号中的每一个在第一时间被发送。 测量电路产生对应于第一和第二信号的幅度的输出信号。 控制电路(430)被耦合以接收输出信号和参考信号。 控制电路被布置成响应于输出信号和参考信号的比较而在第二时间产生控制信号。

    Frequency-domain subchannel transmit antenna selection and power pouring for multi-antenna transmission
    83.
    发明申请
    Frequency-domain subchannel transmit antenna selection and power pouring for multi-antenna transmission 有权
    用于多天线传输的频域子信道发射天线选择和电力倾倒

    公开(公告)号:US20050113041A1

    公开(公告)日:2005-05-26

    申请号:US10723215

    申请日:2003-11-26

    IPC分类号: H04B7/005 H04B1/02

    CPC分类号: H04W52/42

    摘要: A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.

    摘要翻译: 一种系统包括在具有多个子信道的频谱上进行通信的无线设备。 无线设备包括多个天线,无线设备通过多个天线与另一无线设备通信,其中每个天线经由相关联的通信路径与另一无线设备进行通信。 无线设备还包括耦合到天线的子信道功率分析逻辑,并且适于通过子信道来确定子信道上哪个通信路径具有最高通信质量。 无线设备还包括耦合到子信道功率分析逻辑的分集选择逻辑,并且适于基于通信质量来确定相关天线的加权矢量,其中加权向量规定每个子信道的相对发射功率,用于 相关天线。

    Wireless access modem having downstream channel resynchronization method
    84.
    发明申请
    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:US20050044472A1

    公开(公告)日:2005-02-24

    申请号:US10643119

    申请日:2003-08-18

    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。

    Multistage PN code acquisition circuit and method
    85.
    发明申请
    Multistage PN code acquisition circuit and method 有权
    多级PN码采集电路及方法

    公开(公告)号:US20050018646A1

    公开(公告)日:2005-01-27

    申请号:US10918839

    申请日:2004-08-13

    IPC分类号: H04B1/707 H04K1/00

    摘要: A circuit for detecting a serial signal comprises a first circuit (400) coupled to receive the serial signal (200) during a predetermined plurality of time periods of substantially equal duration. The first circuit is coupled to receive a first code (414). The first circuit is arranged to compare a part of the serial signal corresponding to each time period of the plurality of time periods to the first code, thereby producing a match signal. The first circuit accumulates the match signal from each of the each time period of the plurality of time periods.

    摘要翻译: 用于检测串行信号的电路包括第一电路(400),该第一电路被耦合以在基本相等的持续时间的预定多个时间段内接收串行信号(200)。 第一电路被耦合以接收第一代码(414)。 第一电路被布置为将与多个时间段的每个时间段相对应的串行信号的一部分与第一代码进行比较,从而产生匹配信号。 第一电路从多个时间段的每个时间段的每一个累加匹配信号。

    Wireless communications system with secondary synchronization code based on values in primary synchronization code
    87.
    发明授权
    Wireless communications system with secondary synchronization code based on values in primary synchronization code 有权
    基于主同步码中的值的无线通信系统具有辅同步码

    公开(公告)号:US08681834B2

    公开(公告)日:2014-03-25

    申请号:US13403236

    申请日:2012-02-23

    IPC分类号: H04B1/69 H04B1/707 H04B1/713

    摘要: A wireless communication system. The system comprises transmitter circuitry (BST1), the transmitter circuitry comprising encoder circuitry (50) for transmitting a plurality of frames (FR). Each of the plurality of frames comprises a primary synchronization code (PCS) and a second synchronization code (SSC). The encoder circuitry comprises of circuitry (501) for providing the primary synchronization code in response to a first sequence (32). The encoder circuitry further comprises circuitry (502) for providing the secondary synchronization code in response to a second sequence (54) and a third sequence (56). The second sequence is selected from a plurality of sequences. Each of the plurality of sequences is orthogonal with respect to all other sequences. The third sequence is a subset of bits from the first sequence.

    摘要翻译: 无线通信系统。 该系统包括发射机电路(BST1),该发射机电路包括用于传输多个帧(FR)的编码器电路(50)。 多个帧中的每一个包括主同步码(PCS)和第二同步码(SSC)。 编码器电路包括用于响应于第一序列(32)提供主同步码的电路(501)。 编码器电路还包括用于响应于第二序列(54)和第三序列(56)提供辅助同步码的电路(502)。 第二序列从多个序列中选择。 多个序列中的每一个相对于所有其他序列是正交的。 第三个序列是来自第一个序列的比特的子集。

    Primary and secondary synchronization codes from first, second, third sequences
    90.
    发明授权
    Primary and secondary synchronization codes from first, second, third sequences 有权
    来自第一,第二和第三序列的主和次同步码

    公开(公告)号:US08144747B2

    公开(公告)日:2012-03-27

    申请号:US12949413

    申请日:2010-11-18

    IPC分类号: H04B1/69 H04B1/707 H04B1/713

    摘要: A wireless communication system. The system comprises transmitter circuitry (BST1), the transmitter circuitry comprising encoder circuitry (50) for transmitting a plurality of frames (FR). Each of the plurality of frames comprises a primary synchronization code (PCS) and a secondary synchronization code (SSC). The encoder circuitry comprises of circuitry (501) for providing the primary synchronization code in response to a first sequence (32). The encoder circuitry further comprises circuitry (502) for providing the secondary synchronization code in response to a second sequence (54) and a third sequence (56). The second sequence is selected from a plurality of sequences. Each of the plurality of sequences is orthogonal with respect to all other sequences in the plurality of sequences. The third sequence comprises a subset of bits from the first sequence.

    摘要翻译: 无线通信系统。 该系统包括发射机电路(BST1),该发射机电路包括用于传输多个帧(FR)的编码器电路(50)。 多个帧中的每一个包括主同步码(PCS)和辅同步码(SSC)。 编码器电路包括用于响应于第一序列(32)提供主同步码的电路(501)。 编码器电路还包括用于响应于第二序列(54)和第三序列(56)提供辅助同步码的电路(502)。 第二序列从多个序列中选择。 多个序列中的每一个相对于多个序列中的所有其他序列是正交的。 第三序列包括来自第一序列的比特的子集。