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    Pilot signal searching technique for a cellular communications system
    143.
    发明授权
    Pilot signal searching technique for a cellular communications system 失效
    蜂窝通信系统的导频信号搜索技术

    公开(公告)号：US5577022A

    公开(公告)日：1996-11-19

    申请号：US344321

    申请日：1994-11-22

    申请人： Roberto Padovani ,  Walid M. Hamdy ,  Gil Bar-David

    发明人： Roberto Padovani ,  Walid M. Hamdy ,  Gil Bar-David

    IPC分类号： H04B1/707 ,  H04B7/26 ,  H04W36/30 ,  H04B7/216 ,  H04J13/02 ,  H04L27/30

    CPC分类号： H04W36/30 ,  H04B1/707 ,  H04B7/2637

    摘要： An improved method and system for performing a pilot signal searching operation in anticipation of handoff in mobile station communication between base stations is disclosed herein. The searching operation is described herein as being implemented within a cellular communication system which uses code division multiple access (CDMA) modulation techniques. The mobile station maintains a list of an Active Set of pilot signals transmitted from base stations with which the mobile station is to communicate through, and a Neighbor Set of pilots from base stations within a predetermined proximity of the mobile station. In addition to the Neighbor and Active Sets of pilots, the mobile station maintains a list of Candidate and Pre-Candidate Sets of pilots. Based on analysis of the signal strength of the pilot signals received at the mobile station, base station entries from the Neighbor Set may be assigned to the Pre-Candidate and Candidate Sets, and eventually to the Active set. The searching operation contemplates comparing pilot signal strength measurements corresponding to each base station entry within the Neighbor Set to a first predetermined level. One or more entries from the Neighbor Set having a base station signal strength measurement greater than the first predetermined level may be placed in the Pre-Candidate Set. The strength of the pilot signals associated with entries in the Pre-Candidate Set are then further evaluated to determine eligibility within the Candidate Set, from which are selected the entries comprising the Active Set.

    摘要翻译： 这里公开了一种用于在预期基站之间的移动台通信中切换的执行导频信号搜索操作的改进方法和系统。 搜索操作在本文中被描述为在使用码分多址（CDMA）调制技术的蜂窝通信系统内实现。 移动台维护从移动台要与之进行通信的基站发送的导频信号的活动集的列表，以及来自移动台的预定接近范围内的基站的导频的相邻集合。 除了邻近和有效的飞行员组外，移动台还保留有候选和预先考虑的飞行员组列表。 基于在移动站处接收的导频信号的信号强度的分析，可以将来自邻居集的基站条目分配给预先考虑和候选集，并最终分配给活动集。 搜索操作考虑将对应于相邻集合内的每个基站条目的导频信号强度测量值与第一预定电平进行比较。 具有大于第一预定水平的基站信号强度测量的来自邻居集合的一个或多个条目可以被放置在预先考虑集合中。 然后进一步评估与候选集中的条目相关联的导频信号的强度，以确定候选集中的资格，从中选择包含活动集的条目。

    Diversity receiver in a CDMA cellular telephone system
    145.
    发明授权
    Diversity receiver in a CDMA cellular telephone system 失效
    CDMA蜂窝电话系统中的多样性接收机

    公开(公告)号：US5109390A

    公开(公告)日：1992-04-28

    申请号：US432552

    申请日：1989-11-07

    申请人： Klein S. Gilhousen ,  Roberto Padovani ,  Charles E. Wheatly, III

    发明人： Klein S. Gilhousen ,  Roberto Padovani ,  Charles E. Wheatly, III

    IPC分类号： H04B1/7115 ,  H04B1/712 ,  H04B7/08 ,  H04B7/26 ,  H04L1/06 ,  H04Q7/30

    CPC分类号： H04B1/7115 ,  H04L1/06 ,  H04B1/712 ,  H04B2201/70701

    摘要： A spread spectrum receiver subsystem for utilization in a CDMA cellular telephone having a searcher receiver for scanning the time domain so as to use the PN processing gain and time discrimination properties of spread spectrum coding to determine the location in the time domain and the received signal strength of multiple receptions of a pilot signal traveling upon one or more physical propagation paths to reception. The searcher receiver provides a control signal indicative of the received pilot signals of greatest strength and corresponding time relationship. A data receiver receives spread spectrum communication signals accompanying each received pilot signal and is responsive to the searcher control signal for acquiring and demodulating a spread spectrum communication signal, concomitant with the pilot signal of greatest signal strength, and thus providing a corresponding information bearing encoded output signal.

    摘要翻译： 一种扩频接收机子系统，用于具有用于扫描时域的搜索器接收机的CDMA蜂窝电话中，以便利用扩频编码的PN处理增益和时间识别特性来确定时域中的位置和接收信号强度 在接收的一个或多个物理传播路径上行进的导频信号的多次接收。 搜索器接收器提供指示接收到的最大强度和相应时间关系的导频信号的控制信号。 数据接收器接收伴随每个接收到的导频信号的扩展频谱通信信号，并且响应于搜索器控制信号，用于采集和解调扩展频谱通信信号，同时伴随最大信号强度的导频信号，从而提供相应的带有编码输出的信息 信号。