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    MULTIPLE INITIAL SEARCH METHOD FOR CDMA AND GPS SYSTEM
    106.
    发明公开
    MULTIPLE INITIAL SEARCH METHOD FOR CDMA AND GPS SYSTEM 审中-公开
    多重启动搜索程序和CDMA的GPS系统

    公开(公告)号：EP1470653A1

    公开(公告)日：2004-10-27

    申请号：EP03729324.8

    申请日：2003-01-03

    申请人： Qualcomm, Incorporated

    发明人： POON, Wang, Paul ,  ZOU, Qiuzhen

    IPC分类号： H04B1/707

    CPC分类号： H04B1/708 ,  G01S19/30 ,  G01S19/34 ,  G01S19/37 ,  H04B1/70754 ,  H04B1/70758 ,  H04B2201/70711

    摘要： Searcher hardware is multiplexed to perform simultaneous searches in either an IS-95 CDMA mode or a GPS mode. In the IS-95 mode, the search hardware is time-multiplexed into a number of searcher time slices, each of which can generate a PN sequence to despread a data sequence. In the GPS mode, the search hardware is configured as a number of distinct GPS channels, each of which can generate a Gold code sequence for tracking a GPS signal from a particular GPS satellite. This configuration allows the searcher to perform multiple GPS signal searches simultaneously. Signal searching in both IS-95 and GPS modes is performed at significantly higher speeds compared to conventional searcher hardware. Moreover, the search hardware can be dynamically configured to operate in either the IS-95 or the GPS mode, eliminating the need for dedicated circuitry for each mode of operation.

    Device and method for communication between base station and subscriber unit in CDMA communication system
    107.
    发明授权
    Device and method for communication between base station and subscriber unit in CDMA communication system 失效
    装置和方法用于在CDMA通信系统中的固定台和移动单元之间的消息传输

    公开(公告)号：EP1037395B1

    公开(公告)日：2004-10-27

    申请号：EP00111007.1

    申请日：1997-06-23

    申请人： INTERDIGITAL TECHNOLOGY CORPORATION

    发明人： Ozluturk, Fatih ,  Lomp, Gary R. ,  Haim, John W.

    IPC分类号： H04B7/005 ,  H04B1/707 ,  H04B7/26

    CPC分类号： H04W52/60 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/70753 ,  H04B1/70755 ,  H04B1/70758 ,  H04B1/7077 ,  H04B1/708 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04B2201/70703 ,  H04B2201/70707 ,  H04B2201/7071 ,  H04W52/36 ,  H04W52/362 ,  H04W52/367 ,  H04W52/50

    摘要： A system and method for reducing the reacquisition time of a subscriber unit by a base station. The reacquisition time is reduced in that an access signal from a subscriber unit at a predetermined power transmission level is transmitted; said transmission power and a code phase delay of said access signal are varied until a confirmation signal is received from said base station; centered around a maximum code phase delay said access signal is detected at said base station when a sufficient power level and the maximum code phase delay have been achieved; a confirmation signal is transmitted from said base station when said access signal has been detected; said confirmation signal is received at said subscriber unit; and the variation in transmission power and the code phase delay are ceased at said subscriber unit when said confirmation signal is received.

    摘要翻译： 该方法涉及在在初始预定功率电平发送从订户单元的周期性信号。 功率电平以预定的斜坡上升速度增加。 所述周期性信号在基站被检测到时用于检测的足够的功率来实现。 来自基站的信号是反式mitted这证实了周期信号已被检测到。 确认信号在用户单元处被接收。 预定的功率电平斜坡上升当收到确认信号速率停止。 初始预定功率电平是比由基站检测所需的功率电平低。 的信号的功率电平以预定的所有的第二速率小于第一速率增加。

    Code division multiple access communication system
    110.
    发明公开
    Code division multiple access communication system 失效
    Kommunikationssystem mit Mehreren Zugriff durch Kodedivision

    公开(公告)号：EP1343255A3

    公开(公告)日：2003-10-22

    申请号：EP03011222.1

    申请日：1998-03-10

    申请人： INTERDIGITAL TECHNOLOGY CORPORATION

    发明人： The designation of the inventor has not yet been filed

    IPC分类号： H04B7/005

    CPC分类号： H04B1/707 ,  H04B1/7075 ,  H04B1/70753 ,  H04B1/70754 ,  H04B1/70755 ,  H04B1/70758 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/7093 ,  H04B1/7103 ,  H04B1/7115 ,  H04B1/712 ,  H04B1/7183 ,  H04B7/2637 ,  H04B7/264 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04B2201/70703 ,  H04B2201/7071 ,  H04J13/00 ,  H04J13/10 ,  H04J2013/0037 ,  H04L1/004 ,  H04L25/0212 ,  H04L27/206 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0053 ,  H04W24/08 ,  H04W28/22 ,  H04W36/06 ,  H04W52/0238 ,  H04W52/04 ,  H04W52/08 ,  H04W52/143 ,  H04W52/146 ,  H04W52/24 ,  H04W52/26 ,  H04W52/322 ,  H04W52/325 ,  H04W52/343 ,  H04W52/346 ,  H04W52/36 ,  H04W52/362 ,  H04W52/367 ,  H04W52/44 ,  H04W52/50 ,  H04W52/52 ,  H04W52/60 ,  H04W72/0466 ,  H04W88/021 ,  H04W88/08 ,  H04W88/181 ,  Y02D70/1222 ,  Y02D70/164 ,  Y02D70/21 ,  Y02D70/40 ,  Y02D70/449

    摘要： The present invention provides an automatic maintenance power control (MPC) system for a multiple access, spread-spectrum communication system which maintains an initial transmit power level of a subscriber unit, comprising a base station and a plurality of inactive subscriber units, wherein the base station transmits a plurality of forward inactive channel information signals to a plurality of subscriber units as a plurality of forward channel spread-spectrum signals, and each of the inactive subscriber units occasionally transmits to the base station at least one reverse spread-spectrum signal having a reverse transmit power level and including a reverse channel information signal; the base station comprising: a) a plurality of reverse signal measuring means, each reverse signal measuring means comprising: means for measuring a reverse signal-to-noise ratio of the respective reverse channel information signal; a plurality of reverse error generating means, each reverse error generating means for generating a respective reverse channel error signal representing a difference between the respective reverse channel signal-to-noise ratio and a respective pre-determined signal-tonoise ratio; b) system noise measuring means for measuring a system noise power level of the spread-spectrum system comprising: means for receiving a plurality of reverse spread-spectrum signals; means for combining the received spread spectrum signals with an uncorrelated despreading signal to produce a noise signal; and means for measuring a power level of the noise signal to produce a system noise power signal; c) means for multiplying the difference signal by the system noise power signal to generate the reverse channel error signal; and d) a plurality of transmitting means, each transmitting means for transmitting a respective reverse channel error signal as a part of a respective forward channel information signal; wherein each subscriber unit comprises an MPC receiving means for receiving a respective one of the forward channel information signals and for extracting the respective reverse error signal from the forward channel information signal, and a subscriber transmit power adjustment means for adjusting the reverse transmit power level of the respective reverse spread-spectrum signal responsive to the respective reverse error signal.

    摘要翻译： 本发明要求一种多址扩频通信系统，用于通过电信线路动态地改变从远程处理单元（RPU）接收的信息信号的传输速率，并通过第一扩频消息信道 多个扩频消息信道，该系统包括a）连接到RPU的基站，其识别相应信息信号的信息信号速率并响应于信息信号速率提供修改信号; 包括：系统信道控制器，其将所述信息信号和修改信号分配给所述多个扩频消息信道中的不同的扩频消息信道; 第一信息信道模式修改装置，连接到系统信道控制器，并且响应于修改信号，用于将支持第一信息信道速率的第一扩频消息信道的相应信息信号切换到另一预定扩频消息信道， 所述另一个预定扩频消息信道具有支持所识别的信息信号速率的不同信息信道速率; 以及b）用户单元，包括：第一解扩装置，用于恢复相应的信息信号并修改来自第一扩频消息信道的信号; 第二信息信道模式修改装置，响应修改信号，将第一解扩装置重新分配给支持不同信息信道速率的第二解扩装置，第二解扩装置对应于第二扩频消息信道。