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1. 发明申请

WO1998018018A1 DETERMINING DIRECTION OF A MOBILE TERMINAL IN A CELLULAR COMMUNICATION SYSTEM 审中-公开
标题翻译：确定蜂窝通信系统中移动终端的方向
公开(公告)号：WO1998018018A1
公开(公告)日：1998-04-30
申请号：PCT/CA1997000130
申请日：1997-02-26
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , ZHANG, Chang-Gang , TONG, Wen
IPC分类号： G01S03/14
CPC分类号： H04W64/00 , G01S3/48 , G01S5/12 , H04W16/32 , H04W36/04
摘要： A base station for a wireless communications system comprises two antennas (14, 26) spaced by a small distance (d) for receiving a signal from a mobile terminal, and two receivers (34, 36) coupled to the antennas for providing first and second received signals with a phase difference dependent upon a direction of the mobile terminal relative to the antennas. A nulling linear signal combiner (38-44) combines the received signals to determine the phase difference, and hence direction of the mobile terminal, using an adaptively adjusted complex weight Wk which is supplied via an arctangent function (50) to a d.c. tracking filter (50). The determined direction, and distance determined from signal strength information available in the base station, identify the location of the mobile terminal. The location is itself useful information, and can be monitored over time to determine velocity of the mobile terminal and/or can be used to identify candidate terminals for handoff from a macrocell to a microcell of the system.
摘要翻译：一种用于无线通信系统的基站包括用于从移动终端接收信号的小距离（d）间隔的两个天线（14,26）和耦合到所述天线的两个接收器（34,36），用于提供第一和第二具有取决于移动终端相对于天线的方向的相位差的接收信号。归零线性信号组合器（38-44）组合接收的信号以使用经由反正切函数（50）提供给自适应调整的复权重Wk来确定相位差，并因此确定移动终端的方向。跟踪过滤器（50）。确定的方向和从基站中可用的信号强度信息确定的距离识别移动终端的位置。该位置本身是有用的信息，并且可以随时间监视以确定移动终端的速度和/或可以用于识别用于从宏小区到系统的微小区的切换的候选终端。

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