中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

163 records (took 0.024 seconds)

    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES
    24.
    发明专利
    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES 未知

    公开(公告)号：CA2259351C

    公开(公告)日：2003-04-01

    申请号：CA2259351

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

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

    IPC: H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/50 ,  H04W52/60 ,  H04B7/005 ,  H04Q7/22

    Abstract: A system and method of controlling transmission power during the establishme nt 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 ram p- 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 increas es 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 increasin g 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.

    25.
    发明专利
    未知

    公开(公告)号：DE69527372T2

    公开(公告)日：2003-03-27

    申请号：DE69527372

    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

    Abstract: The present invention discloses a communication station for communicating with a second station in a cellular-communication network using spread spectrum modulation wherein the second station transmits power commands to the communication station based on a received power level from the communication station, the communication station comprising: a transmitter having an adjustable transmitter power level for transmitting spread-spectrum signals; means for sequentially receiving power commands from a second station with which communication is being conducted; means for comparing a sequence of at least two of the received power commands to determine if the received commands in the sequence match; and means for adjusting the transmitter power level at a same rate as the reception of the power commands; wherein if the command sequence matches the transmitter power level is adjusted by a different amount than if the command sequence does not match. A method for adjusting a transmitter power level is also disclosed.

    27.
    发明专利
    未知

    公开(公告)号：DE69527372D1

    公开(公告)日：2002-08-14

    申请号：DE69527372

    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

    Abstract: The present invention discloses a communication station for communicating with a second station in a cellular-communication network using spread spectrum modulation wherein the second station transmits power commands to the communication station based on a received power level from the communication station, the communication station comprising: a transmitter having an adjustable transmitter power level for transmitting spread-spectrum signals; means for sequentially receiving power commands from a second station with which communication is being conducted; means for comparing a sequence of at least two of the received power commands to determine if the received commands in the sequence match; and means for adjusting the transmitter power level at a same rate as the reception of the power commands; wherein if the command sequence matches the transmitter power level is adjusted by a different amount than if the command sequence does not match. A method for adjusting a transmitter power level is also disclosed.

    29.
    发明专利
    未知

    公开(公告)号：ES2139558T1

    公开(公告)日：2000-02-16

    申请号：ES98923728

    申请日：1998-05-26

    Applicant: INTERDIGITAL TECH CORP

    Inventor： LOMP GARY R ,  KAZERKEVICH LEONID ,  POLAN JEFFREY S ,  MESECHER DAVID K

    IPC: H04B1/06 ,  H04B7/005 ,  H04B7/08 ,  H04B7/26 ,  H04J13/00 ,  H04W52/52

    Abstract: A communication station includes an antenna system having multiple antennas and delay units for receiving a transmitted signal and outputting a combined signal having a known distortion imparted by the antenna system. The combined signal is in turn processed by a modem, which compensates for the known distortion in a manner which provides improved signal gain. The improved signal gain permits a reduction in transmit power and, accordingly, increased capacity of the communication station. Where the antenna system is to be remotely located from related signal processing equipment, separate units for the RF receiver/transmitter and the other signal processing equipment are provided so that the RF receiver/transmitter may also be remotely located along with the antenna system.

Patent Agency Ranking