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    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES
    1.
    发明申请
    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES 审中-公开
    通过使用短码控制CDMA系统中的初始功率放大的方法

    公开(公告)号：WO9750194A3

    公开(公告)日：1998-06-25

    申请号：PCT/US9710754

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

    Inventor： OZLUTURK FATIH M ,  LOMP GARY R ,  HAIM JOHN W

    IPC: H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/50 ,  H04W52/60 ,  H04B7/005 ,  H04B7/26

    CPC classification number: 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

    Abstract: A system and method of controlling transmission power during the establishment of a channel in a CDMA communication system utilize the transmission of a short code from a subscriber unit to a base station during initial power ramp-up. The short code is a sequence for detection by the base station which has a much shorter period than a conventional spreading code. The ramp-up starts from a power level that is guaranteed to be lower than the required power level for detection by the base station. The subscriber unit quickly increases transmission power while repeatedly transmitting the short code until the signal is detected by the base station. Once the base station detects the short code, it sends an indication to the subscriber unit to cease increasing transmission power. The use of short codes limits power overshoot and interference to other subscriber stations and permits the base station to quickly synchronize to the spreading code used by the subscriber unit.

    Abstract translation: 该方法包括以初始预定功率电平从订户单元发送周期性信号。 功率电平以预定的上升速率增加。 当达到足够的检测功率时，在基站处检测周期信号。 发送来自基站的信号，确认已经检测到周期信号。 在用户单元接收确认信号。 当接收到确认信号时，停止预定功率电平斜升速率。 初始预定功率电平低于由基站检测所需的功率电平。 信号的功率电平以小于第一速率的第二预定速率增加。

    MULTIPATH PROCESSOR FOR TRACKING A PLURALITY OF SPREAD- SPECTRUM SIGNAL GROUPS
    2.
    发明专利
    MULTIPATH PROCESSOR FOR TRACKING A PLURALITY OF SPREAD- SPECTRUM SIGNAL GROUPS 审中-公开

    公开(公告)号：JP2003188766A

    公开(公告)日：2003-07-04

    申请号：JP2002325451

    申请日：2002-11-08

    Applicant: INTERDIGITAL TECH CORP

    Inventor： LOMP GARY R

    IPC: G06F17/10 ,  H03G3/30 ,  H04B20060101 ,  H04B1/04 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/005 ,  H04B7/26 ,  H04J13/00 ,  H04J13/10 ,  H04J13/16 ,  H04W52/22 ,  H04W52/36 ,  H04W52/52 ,  H04W84/00

    Abstract: PROBLEM TO BE SOLVED: To enable large capacity communications by lowering multipath fading. SOLUTION: The multipath processor is provided with a plurality of first correlators, a plurality of second correlators, a first adder, a second adder and a selector or a synthesizer. The first adder is located between a plurality of first correlators and the selector or synthesizer and the second adder is located between a plurality of second correlators and the selector or synthesizer. A plurality of first correlators despread a plurality of spread signals in a first group and generate a plurality of first despread signals, the first adder adds or synthesizes a plurality of first despread signals and generates a first synthetic despread signal, a plurality of second correlators despread a plurality of spread signals in a second group and generate a plurality of secon despread signals, and the second adder generates a second synthetic despread signal by adding or synthesizing a plurality of second despread signals. The selector selects any one of the first and second synthetic despread signals and the selected synthetic despread signal is outputted from a decision device as an output despread signal. COPYRIGHT: (C)2003,JPO

    SYSTEM OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEM BY USING SHORT CODE
    3.
    发明专利
    SYSTEM OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEM BY USING SHORT CODE 审中-公开

    公开(公告)号：JP2002330475A

    公开(公告)日：2002-11-15

    申请号：JP2002065420

    申请日：2002-03-11

    Applicant: INTERDIGITAL TECH CORP

    Inventor： OZLUTURK FATIH M ,  LOMP GARY R ,  HAIM JOHN W

    IPC: H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/50 ,  H04W52/60 ,  H04Q7/38 ,  H04J13/00

    Abstract: PROBLEM TO BE SOLVED: To improve a control method of transmission power ramp-up during the establishment of a communication channel between a subscriber unit and a base station in a radio CDMA communication system. SOLUTION: The system and method of controlling transmission power during the establishment of a channel in a CDMA communication system utilize the transmission of a short code from a subscriber unit to a base station during initial power ramp-up. The short code is a sequence for detection by the base station which has a much shorter period than a conventional spreading code. The ramp-up starts from a power level that is guaranteed to be lower than the required power level for detection by the base station. The subscriber unit quickly increases transmission power while repeatedly transmitting the short code until the signal is detected by the base station. Once the base station detects the short code, it sends an indication to the subscriber unit to cease increasing transmission power. The use of short codes limits power overshoot and interference to other subscriber stations and permits the base station to quickly synchronize to the spreading code used by the subscriber unit.

    SPREAD-SPECTRUM SYSTEM AND METHOD
    6.
    发明公开
    SPREAD-SPECTRUM SYSTEM AND METHOD 失效
    EINRICHUNG UND VERFAHREN ZUR SPEKTRUMSPREIZUNG

    公开(公告)号：EP0801856A4

    公开(公告)日：1998-10-21

    申请号：EP95943981

    申请日：1995-12-22

    Applicant: INTERDIGITAL TECH CORP

    Inventor： LOMP GARY R

    IPC: G06F17/10 ,  H03G3/30 ,  H04B20060101 ,  H04B1/04 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/005 ,  H04B7/26 ,  H04J13/00 ,  H04J13/10 ,  H04J13/16 ,  H04W52/22 ,  H04W52/36 ,  H04W52/52 ,  H04W84/00 ,  H04K1/00 ,  H04B15/00 ,  H04L27/30

    CPC classification number: H04W52/04 ,  H03G3/3042 ,  H03G3/3047 ,  H04B1/69 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7115 ,  H04B1/712 ,  H04B2201/70707 ,  H04J13/00 ,  H04J13/0003 ,  H04J13/10 ,  H04J13/16 ,  H04W52/22 ,  H04W52/221 ,  H04W52/225 ,  H04W52/228 ,  H04W52/36 ,  H04W52/362 ,  H04W52/367 ,  H04W52/52 ,  H04W52/54

    Abstract: A spread-spectrum system and method for providing high-capacity communications through multipath compensation, for automatically and adaptively controlling a mobile user's spread-spectrum transmitter power level when operating in a cellular communications network, and for providing variable or adjustable signal bandwidth capabilities in a spread-spectrum transmitter. Multipath compensation is accomplished using a plurality of filters (121-126), a plurality of multipliers (111-116), and a plurality of weighting devices (131-136), coupled through a first adder (120) and a second adder (130) to a decision device (150). The adaptive power control device of the present invention includes a base station having an AGC amplifier (228), despreader (231), comparator (239), power amplifier (237), delta modulator (235), multiplexer (234), combiner (236) and power measurement device (233). The adaptive power control device also includes a mobile station having a despreader (334), demultiplexer (339), demodulator (340), decision device (345), accumulator (346), step size algorithm device (344), variable gain device (341) and transmitter (342). The variable bandwidth device includes a chipping sequence generator (161), impulse generator (165), product device (164) and filter (166).

    Abstract translation: 一种用于通过多路径补偿提供高容量通信的扩频系统和方法，用于在蜂窝通信网络中工作时自动和自适应地控制移动用户的扩频发射机功率电平，并且用于在一个蜂窝通信网络中提供可变或可调节的信号带宽能力 扩频发射机。 使用通过第一加法器（120）和第二加法器（120）耦合的多个滤波器（121-126），多个乘法器（111-116）和多个加权装置（131-136） 130）到决策装置（150）。 （228），解扩器（231），比较器 236）和功率测量装置（233）。 自适应功率控制设备还包括具有解扩器（334），解复用器（339），解调器（340），判定设备（345），累加器（346），步长算法设备（344），可变增益设备 341）和发射器（342）。 可变带宽设备包括码片序列生成器（161），脉冲生成器（165），产品设备（164）和滤波器（166）。

    Estación base y unidad de abonado en sistemas de comunicación CDMA
    7.
    发明专利
    Estación base y unidad de abonado en sistemas de comunicación CDMA 未知

    公开(公告)号：ES2398666T3

    公开(公告)日：2013-03-20

    申请号：ES07009972

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

    Inventor： OZLUTURK FATIH ,  LOMP GARY R ,  HAIM JOHN W

    IPC: H04W52/50 ,  H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/60

    Abstract: Una unidad de abonado CDMA inalámbrica (16) que comprende: medio (76) para recibir y convertir de forma descendente una señal RF; medio (82) para generar y dar salida a un código de ensanchamiento de recepción a un medio detector del código piloto (80) y un medio receptor de datos (78); el medio detector del código piloto (80) correlacionando una señal de la base de banda con el código de ensanchamiento de recepción y manteniendo la sincronización con el código piloto; el medio del receptor de datos (78) correlacionando la señal de la banda base con el código de ensanchamiento de recepción para procesar la indicación de detección del código corto y la confirmación del código de acceso trasmitida por una estación base (14); medio (86) para generar y dar salida a un código de ensanchamiento de trasmisión a un medio trasmisor de datos (88) y un medio (90) para trasmitir un código corto y un código de acceso, en donde los medio que trasmite el código corto y el código de acceso trasmite el código corto y el código de acceso en diferentes etapas de un procedimiento de crecimiento de potencia, en donde el código corto es mucho más corto que un código de ensanchamiento convencional; en donde el código corto es trasmitido repetidamente en una primera etapa y en respuesta a la recepción de la indicación de detección del código corto cesa la trasmisión del código corto y trasmite el código de acceso en una segunda etapa; en donde una tasa de crecimiento de potencia en la primera etapa es mucho más alta que en la segunda etapa; medio (92) para combinar y convertir de forma ascendente a una trasmisión RF la salida de señales por el medio trasmisor de datos y los medios de trasmisión del código corto y el código de acceso; y medio para sincronizar el medio de generación y salida del código de ensanchamiento de recepción y trasmisión (82, 86).

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