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    Automatic gain control for a WLAN system
    1.
    发明授权
    Automatic gain control for a WLAN system 有权
    WLAN系统的自动增益控制

    公开(公告)号：US07187915B2

    公开(公告)日：2007-03-06

    申请号：US10952035

    申请日：2004-09-28

    申请人： Chih-Chia Wang ,  Kai-Pon Kao

    发明人： Chih-Chia Wang ,  Kai-Pon Kao

    IPC分类号： H04B1/06

    CPC分类号： H04W52/52 ,  H03G3/3052

    摘要： An Automatic Gain Control (AGC) method and system thereof. The power of a detected signal is first checked to ensure that it is large enough for AGC process. A power average of the detected signal is computed and compared to a first threshold in order to determine whether to proceed with a coarse tune procedure or enter a fine tune procedure. Both Low Noise Amplifier (LNA) gain and Variable Gain Amplifier (VGA) gain are tuned during coarse tune, whereas only the VGA gain is tuned during fine tune. The LNA and VGA gains are tuned to predetermined values during coarse tune, and the VGA gain is adjusted according to a difference between a computed average of power and a second threshold.

    摘要翻译： 一种自动增益控制（AGC）方法及其系统。 首先检查检测到的信号的功率，以确保其对AGC过程足够大。 计算检测到的信号的功率平均值并将其与第一阈值进行比较，以便确定是否进行粗调程序或进入微调程序。 低噪声放大器（LNA）增益和可变增益放大器（VGA）增益在粗调调谐期间进行调谐，而只有VGA增益在微调期间进行调谐。 在粗略调谐期间，LNA和VGA增益被调谐到预定值，并且根据计算的功率平均功率和第二阈值之间的差异来调整VGA增益。

    Automatic gain control for a WLAN system
    2.
    发明申请
    Automatic gain control for a WLAN system 有权
    WLAN系统的自动增益控制

    公开(公告)号：US20060068733A1

    公开(公告)日：2006-03-30

    申请号：US10952035

    申请日：2004-09-28

    申请人： Chih-Chia Wang ,  Kai-Pon Kao

    发明人： Chih-Chia Wang ,  Kai-Pon Kao

    IPC分类号： H04B7/00 ,  H04B1/06

    CPC分类号： H04W52/52 ,  H03G3/3052

    摘要： An Automatic Gain Control (AGC) method and system thereof. The power of a detected signal is first checked to ensure that it is large enough for AGC process. A power average of the detected signal is computed and compared to a first threshold in order to determine whether to proceed with a coarse tune procedure or enter a fine tune procedure. Both Low Noise Amplifier (LNA) gain and Variable Gain Amplifier (VGA) gain are tuned during coarse tune, whereas only the VGA gain is tuned during fine tune. The LNA and VGA gains are tuned to predetermined values during coarse tune, and the VGA gain is adjusted according to a difference between a computed average of power and a second threshold.

    摘要翻译： 一种自动增益控制（AGC）方法及其系统。 首先检查检测到的信号的功率，以确保其对AGC过程足够大。 计算检测到的信号的功率平均值并将其与第一阈值进行比较，以便确定是否进行粗调程序或进入微调程序。 低噪声放大器（LNA）增益和可变增益放大器（VGA）增益在粗调调谐期间进行调谐，而只有VGA增益在微调期间进行调谐。 在粗略调谐期间，LNA和VGA增益被调谐到预定值，并且根据计算的功率平均功率和第二阈值之间的差异来调整VGA增益。

    Method and circuit for fine timing synchronization in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11a/g wireless LAN standard
    3.
    发明申请
    Method and circuit for fine timing synchronization in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11a/g wireless LAN standard 有权
    用于IEEE 802.11a / g无线局域网标准的正交频分复用基带接收机中精细定时同步的方法和电路

    公开(公告)号：US20070047433A1

    公开(公告)日：2007-03-01

    申请号：US11215216

    申请日：2005-08-30

    申请人： Kai-Pon Kao

    发明人： Kai-Pon Kao

    IPC分类号： H04B1/69 ,  H04J11/00

    CPC分类号： H04L27/2656 ,  H04L25/022 ,  H04L27/261 ,  H04L27/2675

    摘要： A method for fine timing synchronization is provided. The method comprises: detecting an end point of the short preamble; delivering the samples after the end point to a matched filter to generate a plurality of correlation peaks; searching the correlation peaks generated from the samples of the first LTS for a first maximal peak point which is the correlation peak with a first maximal intensity, and obtaining the first time index of the first maximal peak point; searching the correlation peaks generated from the samples of the first LTS for a pre-peak point which is the correlation peak forming a peak intensity appearing before and nearest to the first maximal peak point, and obtaining the second time index of the pre-peak point; estimating a third time index of the start point of the second LTS according to the first and second time indexes.

    摘要翻译： 提供了精确定时同步的方法。 该方法包括：检测短前导码的终点; 在结束点之后将样本传送到匹配滤波器以产生多个相关峰值; 搜索从第一LTS的样本产生的相关峰作为具有第一最大强度的相关峰的第一最大峰值点，并获得第一最大峰值点的第一时间索引; 搜索从第一LTS的样本产生的相关峰作为相对峰，形成在第一最大峰值点之前和最接近的峰值强度的峰值点，并获得前峰值点的第二时间指数 ; 根据第一和第二时间索引估计第二LTS的起始点的第三时间索引。

    Method and system for assigning a receiving antenna
    5.
    发明申请
    Method and system for assigning a receiving antenna 审中-公开
    用于分配接收天线的方法和系统

    公开(公告)号：US20070066244A1

    公开(公告)日：2007-03-22

    申请号：US11229934

    申请日：2005-09-19

    申请人： Kai-Pon Kao ,  Jeff Lin

    发明人： Kai-Pon Kao ,  Jeff Lin

    IPC分类号： H04B1/44 ,  H04B17/00

    CPC分类号： H04B7/0808

    摘要： Method, system and apparatus for receiving antenna selection, comprising a receiving step, a determining step, an estimating step, and an assigning step. The receiving step involves receiving data and second data associated with a first antenna and a second antenna. It follows the determining step determining first and second throughputs with the first data and the second data. Next the estimating step estimating first signal deviance and second signal deviance between the received data (Dki) and a reference signal (Rki), with the first data and the second data respectively. Finally the assigning step assigning a receiving antenna among the first and the second antennas, based on the first and the second throughputs, and the first and the second signal deviances.

    摘要翻译： 用于接收天线选择的方法，系统和装置，包括接收步骤，确定步骤，估计步骤和分配步骤。 接收步骤包括接收与第一天线和第二天线相关联的数据和第二数据。 遵循确定步骤，利用第一数据和第二数据确定第一和第二吞吐量。 接下来，估计步骤分别与第一数据和第二数据估计接收数据（Dki）和参考信号（Rki）之间的第一信号偏差和第二信号偏差。 最后，基于第一和第二吞吐量以及第一和第二信号偏差来分配在第一和第二天线之间的接收天线的分配步骤。

    Circuit for improving channel impulse response estimation and compensating for remnant frequency offset in the orthogonal frequency division multiplexing (OFDM) baseband receiver for IEEE 802.11a/g wireless LAN standard
    6.
    发明授权
    Circuit for improving channel impulse response estimation and compensating for remnant frequency offset in the orthogonal frequency division multiplexing (OFDM) baseband receiver for IEEE 802.11a/g wireless LAN standard 有权
    用于IEEE 802.11a / g无线局域网标准的正交频分复用（OFDM）基带接收机中用于改善信道脉冲响应估计和补偿残余频率偏移的电路

    公开(公告)号：US07526020B2

    公开(公告)日：2009-04-28

    申请号：US11224757

    申请日：2005-09-13

    申请人： Kai-Pon Kao ,  Tien-Hui Chen

    发明人： Kai-Pon Kao ,  Tien-Hui Chen

    IPC分类号： H03H7/30

    CPC分类号： H04L27/2601 ,  H04L25/0202 ,  H04L25/03292 ,  H04L2025/03414

    摘要： A circuit for improving accuracy of channel impulse response estimation and compensating for remnant frequency offset in a receiver of an orthogonal frequency division multiplexing (OFDM) system is provided. The circuit comprises an equalizer, for compensating a first signal for channel distortion with the channel impulse response estimate to generate a second signal. The circuit also comprises a remnant frequency compensation module, coupled to the equalizer, for rotating a phase of the second signal with a phase angle of an phase offset coefficient calculated according to a plurality of pilot signals of the second signal to generate a third signal. The circuit further comprises a error estimation module, coupled to the remnant frequency compensation module, for generating an error estimate according to the third signal and its hard decision estimate, and the error estimate is further fed back to the equalizer to refine the channel impulse response estimate.

    摘要翻译： 提供了一种用于提高信道脉冲响应估计的精度并补偿正交频分复用（OFDM）系统的接收机中的残余频率偏移的电路。 电路包括均衡器，用于利用信道脉冲响应估计来补偿信道失真的第一信号以产生第二信号。 电路还包括耦合到均衡器的残余频率补偿模块，用于以根据第二信号的多个导频信号计算的相位偏移系数的相位角旋转第二信号的相位，以产生第三信号。 电路还包括耦合到剩余频率补偿模块的误差估计模块，用于根据第三信号及其硬判决估计产生误差估计，并且将误差估计进一步反馈给均衡器以改善信道脉冲响应 估计。

    Circuit for improving channel impulse response estimation and compensating for remnant frequency offset in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11a/g wireless LAN standard standard
    7.
    发明申请
    Circuit for improving channel impulse response estimation and compensating for remnant frequency offset in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11a/g wireless LAN standard standard 有权
    用于IEEE 802.11a / g无线局域网标准标准的正交频分复用基带接收机中用于改善信道脉冲响应估计和补偿残余频率偏移的电路

    公开(公告)号：US20070058734A1

    公开(公告)日：2007-03-15

    申请号：US11224757

    申请日：2005-09-13

    申请人： Kai-Pon Kao ,  Tien-Hui Chen

    发明人： Kai-Pon Kao ,  Tien-Hui Chen

    IPC分类号： H04K1/10

    CPC分类号： H04L27/2601 ,  H04L25/0202 ,  H04L25/03292 ,  H04L2025/03414

    摘要： A circuit for improving accuracy of channel impulse response estimation and compensating for remnant frequency offset in a receiver of an orthogonal frequency division multiplexing (OFDM) system is provided. The circuit comprises an equalizer, for compensating a first signal for channel distortion with the channel impulse response estimate to generate a second signal. The circuit also comprises a remnant frequency compensation module, coupled to the equalizer, for rotating a phase of the second signal with a phase angle of an phase offset coefficient calculated according to a plurality of pilot signals of the second signal to generate a third signal. The circuit further comprises a error estimation module, coupled to the remnant frequency compensation module, for generating an error estimate according to the third signal and its hard decision estimate, and the error estimate is further fed back to the equalizer to refine the channel impulse response estimate.

    摘要翻译： 提供了一种用于提高信道脉冲响应估计的精度并补偿正交频分复用（OFDM）系统的接收机中的残余频率偏移的电路。 电路包括均衡器，用于利用信道脉冲响应估计来补偿信道失真的第一信号以产生第二信号。 电路还包括耦合到均衡器的残余频率补偿模块，用于以根据第二信号的多个导频信号计算的相位偏移系数的相位角旋转第二信号的相位，以产生第三信号。 电路还包括耦合到剩余频率补偿模块的误差估计模块，用于根据第三信号及其硬判决估计产生误差估计，并且将误差估计进一步反馈给均衡器以改善信道脉冲响应 估计。

    Method for updating coefficients in decision feedback equalizer
    8.
    发明申请
    Method for updating coefficients in decision feedback equalizer 有权
    决策反馈均衡器更新系数的方法

    公开(公告)号：US20050063498A1

    公开(公告)日：2005-03-24

    申请号：US10665462

    申请日：2003-09-22

    申请人： Tien-Hui Chen ,  Chingwo Ma ,  Jeff Lin ,  Kai-Pon Kao

    发明人： Tien-Hui Chen ,  Chingwo Ma ,  Jeff Lin ,  Kai-Pon Kao

    IPC分类号： H04B1/707 ,  H04L25/03 ,  H03K5/159 ,  H04B1/10

    CPC分类号： H04B1/7105 ,  H04L25/03057 ,  H04L2025/0349 ,  H04L2025/03611

    摘要： A method for updating coefficients in a decision feedback equalizer (DFE). The DFE comprises an ISI canceller for canceling ISI from a plurality of first signals received from a channel. A first symbol comprising a set of the first signals is decoded to generate a decoded symbol. Then, a vector of error values computed as the difference between the decoded symbol, and the first symbol is obtained. According to the decoded symbol and the vector of the error values, a temp matrix is generated. Next, the values of the elements in every diagonal line of the temp matrix are averaged. Finally, the coefficients are updated by the Toeplitz Matrix.

    摘要翻译： 一种用于更新判决反馈均衡器（DFE）中的系数的方法。 DFE包括用于从从信道接收的多个第一信号中消除ISI的ISI消除器。 包括一组第一信号的第一符号被解码以产生解码符号。 然后，获得作为解码符号和第一符号之间的差计算的误差值的矢量。 根据解码符号和误差值的向量，生成临时矩阵。 接下来，对温度矩阵的每个对角线中的元素的值进行平均。 最后，系数由Toeplitz Matrix更新。

    Method and circuit for fine timing synchronization in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11a/g wireless LAN standard
    9.
    发明授权
    Method and circuit for fine timing synchronization in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11a/g wireless LAN standard 有权
    用于IEEE 802.11a / g无线局域网标准的正交频分复用基带接收机中精细定时同步的方法和电路

    公开(公告)号：US07639748B2

    公开(公告)日：2009-12-29

    申请号：US11215216

    申请日：2005-08-30

    申请人： Kai-Pon Kao

    发明人： Kai-Pon Kao

    IPC分类号： H04K1/10

    CPC分类号： H04L27/2656 ,  H04L25/022 ,  H04L27/261 ,  H04L27/2675

    摘要： A method for fine timing synchronization is provided. The method comprises: detecting an end point of the short preamble; delivering the samples after the end point to a matched filter to generate a plurality of correlation peaks; searching the correlation peaks generated from the samples of the first LTS for a first maximal peak point which is the correlation peak with a first maximal intensity, and obtaining the first time index of the first maximal peak point; searching the correlation peaks generated from the samples of the first LTS for a pre-peak point which is the correlation peak forming a peak intensity appearing before and nearest to the first maximal peak point, and obtaining the second time index of the pre-peak point; estimating a third time index of the start point of the second LTS according to the first and second time indexes.

    摘要翻译： 提供了精确定时同步的方法。 该方法包括：检测短前导码的终点; 在结束点之后将样本传送到匹配滤波器以产生多个相关峰值; 搜索从第一LTS的样本产生的相关峰作为具有第一最大强度的相关峰的第一最大峰值点，并获得第一最大峰值点的第一时间索引; 搜索从第一LTS的样本产生的相关峰作为相对峰，形成在第一最大峰值点之前和最接近的峰值强度的峰值点，并获得前峰值点的第二时间指数 ; 根据第一和第二时间索引估计第二LTS的起始点的第三时间索引。