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159 条记录 (耗时 0.021 秒)

    Interpolation of channel search results
    83.
    发明申请
    Interpolation of channel search results 有权
    频道搜索结果插值

    公开(公告)号：US20030043889A1

    公开(公告)日：2003-03-06

    申请号：US10000928

    申请日：2001-10-23

    发明人： Inyup Kang ,  Mark Roh ,  Brendon L. Johnson

    IPC分类号： H04K001/00

    CPC分类号： H04B1/70758 ,  H04B1/70757 ,  H04B1/7117

    摘要： In general, the invention facilitates searching for energy peaks in spread spectrum wireless communication systems with greater precision. More particularly, various embodiments of the invention may involve reporting not only an energy peak and its associated offset, but also the energy levels corresponding to one or more offsets occurring before and after the offset at which the energy peak occurs. Interpolation or extrapolation techniques may be used to predict the actual location of an energy peak based on the apparent location of the peak and the energy levels observed at surrounding offsets.

    摘要翻译： 通常，本发明有助于以更高的精度搜索扩频无线通信系统中的能量峰值。 更具体地，本发明的各种实施例可以包括不仅报告能量峰值及其相关联的偏移，还报告对应于发生能量峰值的偏移之前和之后发生的一个或多个偏移的能级。 可以使用插值或外插技术来基于峰值的表观位置和在周围偏移处观察到的能量水平来预测能量峰值的实际位置。

    Receiver and receiving method in spread spectrum communication system
    84.
    发明申请
    Receiver and receiving method in spread spectrum communication system 有权
    扩频通信系统中的接收和接收方法

    公开(公告)号：US20010030996A1

    公开(公告)日：2001-10-18

    申请号：US09793492

    申请日：2001-02-27

    发明人： Takaharu Sato ,  Takashi Ueda

    IPC分类号： H04K001/00

    CPC分类号： H04B1/70757 ,  H04B1/7093

    摘要： An over-sampling circuit is provided at a front stage of a digital matched filter, and a received signal is over-sampled with it. Synchronous acquisition of the received spread spectrum signal is implemented by adding the data obtained by the over-sampling, inputting it into the digital matched filter, and then performing a correlation thereon.

    摘要翻译： 在数字匹配滤波器的前级提供过采样电路，并且接收信号被过采样。 通过将通过过采样获得的数据相加，将其输入到数字匹配滤波器中，然后在其上执行相关来实现接收的扩频信号的同步采集。

    Finger assignment in a CDMA rake receiver
    85.
    发明授权
    Finger assignment in a CDMA rake receiver 失效
    CDMA耙式接收机中的手指分配

    公开(公告)号：US06269075B1

    公开(公告)日：2001-07-31

    申请号：US09012953

    申请日：1998-01-26

    申请人： Jean-Marie Tran

    发明人： Jean-Marie Tran

    IPC分类号： H04B7216

    CPC分类号： H04B1/70757 ,  H04B1/7113 ,  H04B1/7117

    摘要： A method and apparatus of assigning fingers in a rake receiver for incorporation in a receiver of a CDMA communications system is disclosed herein. The method includes measuring the multipath profile of a received spread-spectrum radio-frequency (RF) signal to obtain a sequence of measurements, identifying the best candidate path of the RF signal to demodulate by determining which measurement within the sequence has the highest signal strength, deriving a timing offset for the best candidate path as a function of the measurement for the best candidate path and its adjacent measurements, and assigning a finger processing element to the best candidate path using the derived timing offset. The measurements are taken using a searcher having a predetermined timing resolution (e.g., ½ chip), and the resolution of the timing offset is higher (e.g., ⅛ chip). The best candidate path to demodulate is identified using the measurement having the highest amplitude or correlation function. The function used to derive the timing offset is a quadratic passing through the measurement for the best candidate path and adjacent measurements. A correction factor can be applied to the estimated timing offset to correct for non-quadratic multipath profiles. The assignment can be made for an available finger, or a finger can be re-assigned where the best candidate path is better than a path currently being demodulated. This approach can also be used to update and instantaneously adjust the timing of fingers to track on-time samples of the received multipaths during operation of the rake receiver.

    摘要翻译： 本文公开了一种在耙式接收机中分配手指以结合在CDMA通信系统的接收机中的方法和装置。 该方法包括测量接收的扩频射频（RF）信号的多路径分布，以获得测量序列，通过确定该序列内的哪个测量具有最高的信号强度来识别RF信号的最佳候选路径进行解调 导出最佳候选路径的定时偏移量作为最佳候选路径及其相邻测量的测量的函数，以及使用导出的定时偏移将手指处理元件分配给最佳候选路径。 使用具有预定定时分辨率（例如，1/2芯片）的搜索器进行测量，并且定时偏移的分辨率更高（例如，⅛芯片）。 使用具有最高幅度或相关函数的测量来识别解调的最佳候选路径。 用于导出定时偏移的函数是通过测量获得最佳候选路径和相邻测量的二次方法。 可以将校正因子应用于估计的定时偏移以校正非二次多径分布。 可以对可用的手指进行分配，或者可以在最佳候选路径优于当前被解调的路径的情况下重新分配手指。 这种方法还可以用于在耙式接收器的操作期间更新和瞬时地调整手指的定时以跟踪接收的多路径的准时采样。

    Wireless alarm system
    87.
    发明授权
    Wireless alarm system 失效
    无线报警系统

    公开(公告)号：US5953368A

    公开(公告)日：1999-09-14

    申请号：US859378

    申请日：1997-05-20

    申请人： H. Britton Sanderford ,  Robert E. Rouquette

    发明人： H. Britton Sanderford ,  Robert E. Rouquette

    IPC分类号： G08B25/10 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/708 ,  H04K1/00

    CPC分类号： H04B1/708 ,  G08B25/10 ,  H04B1/7075 ,  H04B1/70757 ,  H04B1/7077 ,  H04B1/70756 ,  H04B2201/70715

    摘要： A remote power meter monitoring system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and a computer. The spread spectrum transmitter uses a chip code generator, preamble register, address register data register and oscillator coupled to a microprocessor to transmit information in a direct sequence spread spectrum signal. The spread spectrum receiver acquires synchronization of the spread spectrum signal using a microprocessor to despread and detect the transmitted information, which relates to data from a power meter.

    摘要翻译： 使用扩频发射机，快速频移键控，扩频接收机和计算机的远程功率计监控系统。 扩频发射机使用芯片码发生器，前导码寄存器，地址寄存器数据寄存器和耦合到微处理器的振荡器以直接序列扩频信号传输信息。 扩频接收机使用微处理器获取扩频信号的同步，对与功率计的数据有关的发送信息进行解扩和检测。

    Spread spectrum communication synchronizing method and its circuit
    90.
    发明授权
    Spread spectrum communication synchronizing method and its circuit 失效
    扩频通信同步方法及其电路

    公开(公告)号：US5818869A

    公开(公告)日：1998-10-06

    申请号：US858146

    申请日：1997-05-15

    申请人： Kazuyuki Miya ,  Roland Go ,  Hiroyuki Kanaya

    发明人： Kazuyuki Miya ,  Roland Go ,  Hiroyuki Kanaya

    IPC分类号： H04B1/707 ,  H04B1/7073 ,  H04B1/7075 ,  H04B7/26 ,  H04W56/00 ,  H04L7/00

    CPC分类号： H04B1/70752 ,  H04B1/70754 ,  H04B1/70757

    摘要： A synchronizing method and circuit accurately and stably operates a direct spread spectrum multiple access communication system. A signal transmitted by modulating the spreading code with data at the transmission side is sampled by a signal of n times (n: 1 or larger integer) the clock speed of the spread spectrum signal at the reception side, and the correlation is detected by a digital matched filter. Consequently, the detection output in every sample in the symbol period is compared with the envelope detection output determined in every sampling period, and the sample positions for a specific number of determined samples are stored in the descending order of the output. The number of times of storage of large sample positions in the stored detection output is counted in every symbol period, and the position of the largest number of storage times is detected as the peak position. From this peak position, capturing or holding the symbol period, and setting of the reception window position results.

    摘要翻译： 一种同步方法和电路准确稳定地操作直扩扩频多址通信系统。 通过在发送侧用数据调制扩展码发送的信号由接收侧的扩频信号的时钟速度的n倍（n = 1或更大整数）的信号进行采样，并且相关性由 数字匹配滤波器 因此，将符号周期中的每个采样中的检测输出与在每个采样周期中确定的包络检测输出进行比较，并且以输出的降序存储特定数量的确定采样的采样位置。 在每个符号周期中对存储的检测输出中的大样本位置的存储次数进行计数，并且检测最大数量的存储时间的位置作为峰值位置。 从该峰值位置，捕获或保持符号周期，并设置接收窗口位置结果。