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    • 4. 发明授权
    • System and method for wireless signal time of arrival
    • 无线信号到达时间的系统和方法
    • US07474994B2
    • 2009-01-06
    • US10057441
    • 2002-01-25
    • Ivan Fernandez-CorbatonJeremy SteinRoland R. Rick
    • Ivan Fernandez-CorbatonJeremy SteinRoland R. Rick
    • G06F17/10
    • H04W64/00G01S5/02G01S5/0221
    • A system and method for accurately determining time of arrival using a mathematical model that mimics a correlation function. A correlation value is sampled at a predetermined periodic interval and a maximum correlation value, coinciding with a particular point in time, is determined. The mathematical model uses the maximum measured correlation value and correlation values at adjacent sample points to determine coefficients for the selected mathematical model. The coefficients may be calculated and used to determine the actual peak, which may fall in-between the sample points. The actual peak value is used to accurately determine the time of arrival of a signal. Time of arrival signals from a plurality of remote transmitters are used along with conventional triangulation techniques to accurately determine the location of the wireless unit.
    • 使用模拟相关函数的数学模型来准确地确定到达时间的系统和方法。 以预定的周期性间隔对相关值进行采样,并且确定与特定时间点一致的最大相关值。 数学模型使用相邻采样点的最大测量相关值和相关值来确定所选数学模型的系数。 可以计算系数并用于确定可能落在采样点之间的实际峰值。 实际峰值用于准确确定信号的到达时间。 来自多个远程发射机的到达时间信号与传统的三角测量技术一起被使用以精确地确定无线单元的位置。
    • 7. 发明授权
    • Accelerated message decoding
    • 加速消息解码
    • US06567390B1
    • 2003-05-20
    • US09280778
    • 1999-03-29
    • Brian C. BanisterRoland R. Rick
    • Brian C. BanisterRoland R. Rick
    • H04B7216
    • H04L1/0071H04L1/0045H04W52/0229
    • A message that has its energy spread over a frame of encoded data is decoded. First, encoded data are received so as to obtain a quantity of the encoded data that is less than all the encoded data in the frame and also is less than all the encoded data representing the message. Then, the quantity of encoded data received is supplemented, without receiving additional encoded data, so as to obtain a frame of data. Typically, the data will be supplemented by zero padding the data, such as by initializing a frame buffer to all zeros and then overwriting the zero data with actual data as it is received. Finally, ordinary frame decoding is performed on the frame of data so generated, in order to decode the message.
    • 将其能量扩展到编码数据的帧的消息被解码。 首先,接收编码数据,以获得小于帧中的所有编码数据的编码数据的数量,并且小于表示消息的所有编码数据。 然后,补充接收的编码数据量,而不接收附加的编码数据,以获得数据帧。 通常,数据将通过零填充数据来补充,例如通过将帧缓冲区初始化为全零,然后在接收到实际数据时覆盖零数据。 最后,对所生成的数据帧执行普通帧解码,以解码消息。
    • 10. 发明授权
    • Parameter estimator configured to distinguish between peaks and sidelobes of correlation function
    • 参数估计器被配置为区分相关函数的峰值和旁瓣
    • US07308022B2
    • 2007-12-11
    • US10060885
    • 2002-01-29
    • Roland R. RickMessay AmergaJeremy M. SteinIvan Fernandez-Corbaton
    • Roland R. RickMessay AmergaJeremy M. SteinIvan Fernandez-Corbaton
    • H04B1/00
    • G01S5/0215G01S5/0221G01S19/22H04B1/70755H04B1/7117
    • A parameter estimator for estimating one or more parameter(s) from a signal is described. A correlation function is derived from the signal, and the correlation function analyzed to determine if one or more first peak(s) are present, and, if so, distinguishable from the sidelobe(s) of a second peak. If the one or more first peak(s) are present and distinguishable from the sidelobe(s) of the second peak, the one or more parameter(s) are estimated from the one or more first peak(s). If the one or more first peak(s) are not present, or, if present, are not distinguishable from the sidelobe(s) of the second peak, the one or more parameter(s) are estimated from the second peak. The parameter estimator may be employed in a subscriber station to estimate a parameter such as the time of arrival of one or more base station or sector pilot signals in a wireless communication system. This information may be utilized in an overall advanced forward link trilateration (AFLT) process for estimating the location of the subscriber station.
    • 描述了用于从信号估计一个或多个参数的参数估计器。 从信号中导出相关函数,分析相关函数以确定是否存在一个或多个第一峰,如果是,则与第二峰的旁瓣区分开。 如果一个或多个第一峰存在并且可与第二峰的旁瓣区分开,则从一个或多个第一峰估计一个或多个参数。 如果一个或多个第一峰不存在,或者如果存在,则不能与第二峰的旁瓣区分开,则从第二峰估计一个或多个参数。 可以在用户台中使用参数估计器来估计诸如无线通信系统中的一个或多个基站或扇区导频信号的到达时间的参数。 该信息可以用于用于估计用户台的位置的总体高级前向链路三边测量(AFLT)过程。