System and method for synchronizing multiuser signals for OFDM CDMA
    1.
    发明授权
    System and method for synchronizing multiuser signals for OFDM CDMA 有权
    用于OFDM CDMA的多用户信号同步的系统和方法

    公开(公告)号:US07161927B2

    公开(公告)日:2007-01-09

    申请号:US10127190

    申请日:2002-04-09

    IPC分类号: H04B7/216

    摘要: A system and a method for deriving transmitted signals from multiple users for an OFDM-CDMA communication system are described herein. An optimum synchronizer for use in an OFDM-CDMA system is also provided. In one aspect, the system and method incorporate a programmable structure for different OFDM-CDMA systems (e.g., MC-CDMA, MC-DS-CDMA, and MT-CDMA) that can be efficiently implemented. The programmable structure is based on the linear minimum mean square error (LMMSE) or best linear unbiased estimator (BLUE) techniques. In addition, an efficient algorithm for reducing computations of fast Fourier transform (FFT) is presented.

    摘要翻译: 这里描述了用于从OFDM-CDMA通信系统的多个用户导出发送信号的系统和方法。 还提供了一种用于OFDM-CDMA系统的最佳同步器。 在一个方面,该系统和方法结合了可以有效实现的不同OFDM-CDMA系统(例如,MC-CDMA,MC-DS-CDMA和MT-CDMA)的可编程结构。 可编程结构基于线性最小均方误差(LMMSE)或最佳线性无偏估计(BLUE)技术。 此外,还提出了一种用于减少快速傅立叶变换(FFT)计算的有效算法。

    Broadcast receiver and method for regulating the same
    2.
    发明授权
    Broadcast receiver and method for regulating the same 有权
    广播接收机及其调节方法

    公开(公告)号:US08437716B2

    公开(公告)日:2013-05-07

    申请号:US12409029

    申请日:2009-03-23

    IPC分类号: H04B1/18

    CPC分类号: H03G3/3068 H04H60/43

    摘要: A broadcast receiver includes a tuner circuit and a demodulator circuit. The tuner circuit tunes a radio frequency (RF) signal to output an intermediate frequency (IF) signal. The demodulator circuit demodulates the IF signal from the tuner circuit and outputs a command signal based on the quality of the IF signal, for changing a take over point (TOP) value, preset in the tuner circuit, at which one amplitude gain control (AGC) stopping and another taking over. A method for regulating a broadcast receiver is also disclosed herein.

    摘要翻译: 广播接收机包括调谐器电路和解调器电路。 调谐器电路调谐射频(RF)信号以输出中频(IF)信号。 解调器电路解调来自调谐器电路的IF信号,并且基于IF信号的质量输出命令信号,用于改变在调谐器电路中预设的接收点(TOP)值,其中一个幅度增益控制(AGC )停止和另一个接管。 本文还公开了一种用于调节广播接收机的方法。

    Automatic video gain control circuit for positive and negative modulation and method thereof
    3.
    发明授权
    Automatic video gain control circuit for positive and negative modulation and method thereof 有权
    用于正负调制的自动视频增益控制电路及其方法

    公开(公告)号:US08233093B2

    公开(公告)日:2012-07-31

    申请号:US11689516

    申请日:2007-03-22

    申请人: Shan-Tsung Wu

    发明人: Shan-Tsung Wu

    IPC分类号: H04N5/52

    摘要: Disclosed is an automatic video gain control circuit, which includes an analog to digital converter, an envelope detector and an extreme value detector. The analog to digital converter converts an analog video signal to a digital video signal. The envelope detector detects a baseband amplitude signal according to the digital video signal. The extreme value detector generates an extreme value to control RF signal gain.

    摘要翻译: 公开了一种自动视频增益控制电路,其包括模数转换器,包络检测器和极值检测器。 模数转换器将模拟视频信号转换为数字视频信号。 包络检测器根据数字视频信号检测基带振幅信号。 极值检测器产生极值以控制RF信号增益。

    Broadcast Receiver and Method for Regulating the Same
    4.
    发明申请
    Broadcast Receiver and Method for Regulating the Same 有权
    广播接收机及其调节方法

    公开(公告)号:US20100240334A1

    公开(公告)日:2010-09-23

    申请号:US12409029

    申请日:2009-03-23

    IPC分类号: H04B1/18

    CPC分类号: H03G3/3068 H04H60/43

    摘要: A broadcast receiver includes a tuner circuit and a demodulator circuit. The tuner circuit tunes a radio frequency (RF) signal to output an intermediate frequency (IF) signal. The demodulator circuit demodulates the IF signal from the tuner circuit and outputs a command signal based on the quality of the IF signal, for changing a take over point (TOP) value, preset in the tuner circuit, at which one amplitude gain control (AGC) stopping and another taking over. A method for regulating a broadcast receiver is also disclosed herein.

    摘要翻译: 广播接收机包括调谐器电路和解调器电路。 调谐器电路调谐射频(RF)信号以输出中频(IF)信号。 解调器电路解调来自调谐器电路的IF信号,并且基于IF信号的质量输出命令信号,以改变在调谐器电路中预设的接收点(TOP)值,其中一个幅度增益控制(AGC )停止和另一个接管。 本文还公开了一种用于调节广播接收机的方法。

    SMART CHANNEL SCAN METHOD AND ASSOCIATED APPARATUS
    5.
    发明申请
    SMART CHANNEL SCAN METHOD AND ASSOCIATED APPARATUS 审中-公开
    智能通道扫描方法及相关设备

    公开(公告)号:US20090066850A1

    公开(公告)日:2009-03-12

    申请号:US12196249

    申请日:2008-08-21

    申请人: Shan-Tsung Wu

    发明人: Shan-Tsung Wu

    IPC分类号: H04N5/50

    摘要: A smart channel scan method and associated apparatus, for searching center frequencies and symbol rates of the video signal channels. The smart channel scan method performs spectrum analysis for the video signal to generate a power spectrum density signal and obtain a plurality of center frequencies and coarse bandwidth. Symbol rates are determined according to the power spectrum density signal and the coarse bandwidth.

    摘要翻译: 一种用于搜索视频信号通道的中心频率和符号率的智能信道扫描方法和相关设备。 智能信道扫描方法对视频信号进行频谱分析,生成功率谱密度信号,获得多个中心频率和粗略带宽。 符号速率根据功率谱密度信号和粗带宽确定。

    AUTOMATIC VIDEO GAIN CONTROL CIRCUIT AND METHOD THEREOF
    6.
    发明申请
    AUTOMATIC VIDEO GAIN CONTROL CIRCUIT AND METHOD THEREOF 有权
    自动视频增益控制电路及其方法

    公开(公告)号:US20080122957A1

    公开(公告)日:2008-05-29

    申请号:US11689516

    申请日:2007-03-22

    申请人: Shan-Tsung Wu

    发明人: Shan-Tsung Wu

    IPC分类号: H04N5/20 H04N5/235 H04N5/52

    摘要: Disclosed is an automatic video gain control circuit, which includes an analog to digital converter, an envelope detector and an extreme value detector. The analog to digital converter converts an analog video signal to a digital video signal. The envelope detector detects a baseband amplitude signal according to the digital video signal. The extreme value detector generates an extreme value to control RF signal gain.

    摘要翻译: 公开了一种自动视频增益控制电路,其包括模数转换器,包络检测器和极值检测器。 模数转换器将模拟视频信号转换为数字视频信号。 包络检测器根据数字视频信号检测基带振幅信号。 极值检测器产生极值以控制RF信号增益。