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45 条记录 (耗时 0.05 秒)

    Multichannel demodulator
    41.
    发明授权
    Multichannel demodulator 失效
    多通道解调器

    公开(公告)号：US06639906B1

    公开(公告)日：2003-10-28

    申请号：US08987172

    申请日：1997-12-09

    申请人： Jeffrey A. Levin

    发明人： Jeffrey A. Levin

    IPC分类号： H04J1300

    CPC分类号： H04B1/70752 ,  H04B1/70735 ,  H04B1/70753 ,  H04B1/70756 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/7113 ,  H04B2001/70935

    摘要： A system and method for performing the digital receive processing for multiple signals received over the same RF band is described. In a preferred embodiment of the invention, digital RF samples are stored in a queue which is accessed by a searcher and demodulator. The searcher and demodulator are preferably located on the same integrated circuit along with the queue. The demodulator demodulates a set of reverse link signals stored within the queue where each reverse link signal is received with at a particular time offset and processed using a particular channel code. The searcher periodically searches for reverse link signals not being processed by the demodulator, and for access requests transmitted via the access channel. The searcher preferably searches during the worthy power control groups of each reverse link signal, which corresponds to the two of sixteen power control groups transmitted during, an eighth rate frame.

    摘要翻译： 描述了用于对通过相同RF频带接收的多个信号执行数字接收处理的系统和方法。 在本发明的优选实施例中，数字RF样本被存储在由搜索器和解调器访问的队列中。 搜索器和解调器优选地与队列一起位于同一集成电路上。 解调器解调存储在队列中的一组反向链路信号，其中每个反向链路信号在特定时间偏移处被接收并且使用特定信道码进行处理。 搜索者周期性地搜索未被解调器处理的反向链路信号，以及用于经由接入信道发送的接入请求。 搜索者优选地在每个反向链路信号的有价值的功率控制组中搜索，其对应于在第八速率帧期间发送的十六个功率控制组中的两个。

    Method and apparatus for time tracking
    42.
    发明授权
    Method and apparatus for time tracking 有权
    时间跟踪的方法和装置

    公开(公告)号：US06229839B1

    公开(公告)日：2001-05-08

    申请号：US09246446

    申请日：1999-02-08

    申请人： Jeffrey A. Levin ,  Christopher C. Riddle ,  Tom Sherman

    发明人： Jeffrey A. Levin ,  Christopher C. Riddle ,  Tom Sherman

    IPC分类号： H04L2730

    CPC分类号： H04B1/7085

    摘要： In order to time track an incoming signal, a receiver demodulates a first instance of a signal to produce a first set of energy values corresponding to a set of possible data values of the signal. The receiver also demodulates a second instance of the signal to produce a second set of energy values corresponding to the set of possible data values. The receiver combines the first and the second sets of energy values to determine a combined set of energy values. The receiver determines a first estimate of a most likely transmitted data value based upon the combined set of energy values. The receiver decovers an early set of despread samples of the first instance using a symbol corresponding to the first estimate to produce a first early energy value. The receiver decovers a late set of despread samples of the first instance using the symbol corresponding to the first estimate to produce a first late energy value. Finally, the receiver determines a time offset of the first instance based upon the first early and the first late energy values.

    摘要翻译： 为了时间跟踪输入信号，接收机解调信号的第一实例以产生对应于信号的一组可能数据值的第一组能量值。 接收机还解调信号的第二实例以产生对应于该组可能数据值的第二组能量值。 接收器组合第一和第二组能量值以确定能量值的组合。 接收机基于组合的能量值来确定最可能发送的数据值的第一估计。 接收机使用对应于第一估计的符号来解码第一实例的早期解扩样本集合以产生第一早期能量值。 接收机使用对应于第一估计的符号来解码第一实例的延迟的解扩样本集，以产生第一晚能量值。 最后，接收机基于第一早期和第一后期能量值来确定第一实例的时间偏移。

    System and method for probability based lock detection
    43.
    发明授权
    System and method for probability based lock detection 有权
    基于概率的锁定检测系统和方法

    公开(公告)号：US06201827B1

    公开(公告)日：2001-03-13

    申请号：US09150498

    申请日：1998-09-09

    申请人： Jeffrey A. Levin ,  Christopher C. Riddle

    发明人： Jeffrey A. Levin ,  Christopher C. Riddle

    IPC分类号： H04L2730

    CPC分类号： H04B7/2628 ,  H04B1/709 ,  H04B1/7115 ,  H04B1/712

    摘要： The probability based lock detection circuit determines whether a signal is sufficiently strong for communications in a mobile telecommunications system. If a signal is below a maximum energy threshold, the probability based lock detection is used to determine if the receiver is sufficiently capable to detect the signal and combine the signal with other signals received to obtain data transmitted by a mobile telephone. The probability based lock detection involves comparing index representations of maximums of 64 possible energies sent by the mobile telephone that identify that the signal was sent by mobile telephone. A mobile telephone sends signal that arrives to a base station through multiple paths to ensure accurate data transmission. Each signal includes data that identifies the mobile telephone. The probability based lock detection circuit determines whether the index of the maximum of 64 possible values of a signal sent to identify the mobile telephone is the same as the index of the maximum of the 64 possible values as calculated by combining all of signals sent by the mobile telephone.

    摘要翻译： 基于概率的锁定检测电路确定信号对于移动电信系统中的通信是否足够强。 如果信号低于最大能量阈值，则使用基于概率的锁定检测来确定接收机是否足够能够检测信号并将信号与接收的其他信号组合以获得由移动电话发送的数据。 基于概率的锁定检测涉及比较由移动电话发送的识别由移动电话发送的信号的最大64个可能能量的索引表示。 移动电话通过多个路径发送到基站的信号，以确保准确的数据传输。 每个信号包括识别移动电话的数据。 基于概率的锁定检测电路确定发送以识别移动电话的信号的最大值64个可能值的索引与通过组合由所述移动电话发送的所有信号的所有信号计算的64个可能值的最大值的索引相同 移动电话。