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14 条记录 (耗时 0.025 秒)

    Carrier recovery and doppler frequency estimation
    1.
    发明授权
    Carrier recovery and doppler frequency estimation 有权
    载波恢复和多普勒频率估计

    公开(公告)号：US06532271B1

    公开(公告)日：2003-03-11

    申请号：US09430372

    申请日：1999-10-29

    申请人： Syang-Myau Hwang ,  Lin Yang ,  Mao Yu ,  Gibong Jeong

    发明人： Syang-Myau Hwang ,  Lin Yang ,  Mao Yu ,  Gibong Jeong

    IPC分类号： H04L2722

    CPC分类号： H04L27/2278 ,  H04L2027/0065 ,  H04L2027/0081

    摘要： Method and system for carrier recovery and estimation of Doppler shift from a signal source that is moving relative to a signal receiver. A pure carrier preamble for the received signal is processed through each of two stages of a linear predictor to obtain a successively more accurate estimation of a Doppler frequency offset for the carrier. The received signal is downconverted by each stage estimation of the Doppler frequency offset, and the downconverted signal is processed through a decision feedback phase locked loop to provide a signal in which substantially all of the Doppler offset and/or phase angle are identified and removed. The system has low complexity, is fast, and is accurate to within an estimated few tens of Hertz and will work with signals having relatively low signal-to-noise ratios. The invention is useful for receipt of signals from satellites in low earth orbits (LEOs) and other non-geosynchronous orbits, and wherever a transmitter and receiver are moving relative to each other.

    摘要翻译： 用于载波恢复和从相对于信号接收机移动的信号源估计多普勒频移的方法和系统。 通过线性预测器的两个级中的每一级处理接收信号的纯载波前导码，以获得载波的多普勒频偏的连续更准确的估计。 接收到的信号通过多普勒频率偏移的每个级估计进行下变频，并且通过判决反馈锁相环处理下变频信号，以提供其中基本上全部多普勒偏移和/或相位角被识别和去除的信号。 该系统的复杂度低，速度快，准确度达到几十赫兹，并且能够处理信噪比相对较低的信号。 本发明对于从低地球轨道（LEO）和其他非地球同步轨道中的卫星以及发射机和接收机相对于彼此移动的任何地方接收信号是有用的。

    TRAINING OF THE NON-UPDATED DECISION FEEDBACK EQUALIZER FOR A 8-VSB RECEIVER
    4.
    发明申请
    TRAINING OF THE NON-UPDATED DECISION FEEDBACK EQUALIZER FOR A 8-VSB RECEIVER 审中-公开
    针对8-VSB接收机的非更新决策反馈均衡器的培训

    公开(公告)号：US20100080275A1

    公开(公告)日：2010-04-01

    申请号：US12239794

    申请日：2008-09-28

    申请人： Lin Yang ,  Jun Lu ,  Shue-Lee Chang ,  Jing Li ,  Syang-Myau Hwang

    发明人： Lin Yang ,  Jun Lu ,  Shue-Lee Chang ,  Jing Li ,  Syang-Myau Hwang

    IPC分类号： H03H7/30 ,  H03H7/40

    CPC分类号： H04L25/03146 ,  H04L25/0202 ,  H04L27/02 ,  H04L2025/03477 ,  H04L2025/0349

    摘要： A method for training of a non-updated decision feedback equalizer is provided. The method comprising the steps of: providing a sequence of frames adapted to be received by a receiver; provide a sequence of synchronization frames interposed between a predetermined number of frames; and using at least part of the sequence of synchronization frames to train a decision feedback equalizer (DFE), thereby speeding up system convergence or making system convergence possible.

    摘要翻译： 提供了一种用于训练未更新的判决反馈均衡器的方法。 该方法包括以下步骤：提供适于由接收机接收的帧序列; 提供插入在预定数量帧之间的同步帧序列; 并且使用同步帧序列的至少一部分来训练判决反馈均衡器（DFE），从而加速系统收敛或使系统收敛成为可能。

    Chip-to-symbol receiver despreader architechtures and methods for despreading spread spectrum signals
    9.
    发明申请
    Chip-to-symbol receiver despreader architechtures and methods for despreading spread spectrum signals 有权
    芯片到符号接收机解扩器架构和解扩扩频信号的方法

    公开(公告)号：US20050105597A1

    公开(公告)日：2005-05-19

    申请号：US10876160

    申请日：2004-06-23

    申请人： Syang-Myau Hwang ,  Yiping Fan ,  Chen-Yi Chang ,  Hongyu Li ,  Chieh-Yuan Chao

    发明人： Syang-Myau Hwang ,  Yiping Fan ,  Chen-Yi Chang ,  Hongyu Li ,  Chieh-Yuan Chao

    IPC分类号： H04B1/69 ,  H04B1/707 ,  H04J11/00 ,  H04L25/06 ,  H04L27/14

    CPC分类号： H04J13/00 ,  H04B1/709 ,  H04B1/7097 ,  H04L25/061 ,  H04L27/142

    摘要： In a spread spectrum system, methods and despreader architectures for despreading the received spreaded codes with the use of a single correlator and a single correlation code is provided. Before despreading the incoming received spreaded codes, a single correlation code is generated using a symbol from a set of symbols that has been mapped into a set of differential encoded PN codes. Despreading output samples for each received spreaded code are obtained by correlating the received spreaded code with this single correlation code. Correlation is accomplished by multiplying each received sample of the received spreaded codes with the correlation code samples and accumulating the products of this multiplication. After correlation, the index for the maximum or minimum peak of the despreading output samples for each code is identified. This index can then be mapped into a symbol corresponding to the transmitted information. Corresponding despreader architectures comprise of a number of taps attached to a series of shift registers. Received samples of each received spreaded codes are inputted into the shift registers. The despreader architectures accumulates the products of multiplication of the value of the shift register with a predetermined value associated with each tap to produce the despreading output samples of a received spreaded code. It identifies the despreading output index producing the maximum of the absolute value of the despreading output and maps said index into a symbol corresponding to the transmitted information.

    摘要翻译： 在扩展频谱系统中，提供了使用单个相关器和单个相关码解扩接收的扩展码的方法和解扩器体系结构。 在解扩输入的接收的扩展码之前，使用已经被映射到一组差分编码的PN码的符号集合中的符号来生成单个相关码。 通过将接收到的扩展代码与该单个相关代码相关联来获得每个接收到的扩展代码的解扩输出样本。 通过将接收到的扩展码的每个接收样本与相关代码采样相乘并累加该乘法的乘积来实现相关。 在相关之后，识别每个代码的解扩输出样本的最大或最小峰值的索引。 然后可以将该索引映射到对应于发送的信息的符号。 相应的解扩器架构包括附接到一系列移位寄存器的多个抽头。 每个接收的分散码的接收样本被输入到移位寄存器中。 解扩器架构将移位寄存器的值乘以与每个抽头相关联的预定值的乘积累积以产生接收到的扩展代码的解扩输出样本。 它识别解扩输出索引，产生解扩输出的绝对值的最大值，并将所述索引映射成对应于发送信息的符号。

    Receiver based method for de-spreading of spread spectrum signal
    10.
    发明授权
    Receiver based method for de-spreading of spread spectrum signal 有权
    基于接收机的扩频信号解扩方法

    公开(公告)号：US07424047B2

    公开(公告)日：2008-09-09

    申请号：US10712643

    申请日：2003-11-13

    申请人： Yiping Fan ,  Syang-Myau Hwang ,  Hongyu Li ,  Chieh-Yuan Chao

    发明人： Yiping Fan ,  Syang-Myau Hwang ,  Hongyu Li ,  Chieh-Yuan Chao

    IPC分类号： H04B1/00

    CPC分类号： H04B1/7097 ,  H04B1/709 ,  H04J13/00 ,  H04L25/061 ,  H04L27/142

    摘要： A spread spectrum receiver whose de-spreading process based on transformed spreading codes is provided. Instead of de-spreading with original spreading codes, this approach de-spreads received signal with the spreading codes transformed from the original codes in order to eliminate the negative impact of system impairments such as frequency offset to a spread spectrum receiver. Before de-spreading with the transformed code, the received signal goes through the same transformation as the original codes do. After a transformation, the transformed codes may exist some undesirable property such as spreading code having DC content. An approach is given to cancel unwanted side effects relating the transformed spreading codes. The approaches are very effective for spread spectrum system based on frequency modulation scheme such as MSK. For this kind of system, the frequency offset translates to DC offset after the transformation and the DC offset can be cancel since the DC property of the transformed spreading code is known in advance.

    摘要翻译： 一种扩展频谱接收机，其基于变换的扩频码进行解扩处理。 代替使用原始扩展码去扩展，该方法使用从原始码转换的扩展码对接收信号进行解扩，以消除诸如频率偏移对扩频接收机的系统损伤的负面影响。 在使用变换后的代码进行解扩后，接收到的信号经过与原始代码相同的转换。 在变换之后，变换的代码可能存在一些不期望的属性，例如具有DC内容的扩展码。 给出了一种解决与转换的扩展码有关的不必要的副作用的方法。 这种方法对于基于MSK等频率调制方案的扩频系统非常有效。 对于这种系统，频率偏移转换为变换后的DC偏移，并且可以取消DC偏移，因为转换的扩展码的DC属性预先已知。