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    A METHOD AND APPARATUS FOR LOCATING A WIRELESS MOBILE UNIT
    21.
    发明专利
    A METHOD AND APPARATUS FOR LOCATING A WIRELESS MOBILE UNIT 未知

    公开(公告)号：CA2289049A1

    公开(公告)日：2000-06-18

    申请号：CA2289049

    申请日：1999-11-08

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHIANG TUNG CHING ,  CHEN BYRON HUA ,  HUANG HOWARD C

    IPC: H04Q7/34 ,  G01S5/00 ,  G01S5/06 ,  G01S5/14 ,  G01S19/17 ,  G01S19/34 ,  G01S19/35 ,  H04Q7/36 ,  H04M11/04

    Abstract: A position locator enables the detection of an originating location of a 911 caller under various RF propagation positions. Through the use of a transceiver and global positioning unit in a portable position locator, even if only one base station receiving the 911 call can be detected, the origin of the 911 call can still be located. Utilizing information from the position locator and at least one base station, an estimated distance between the position locator and the 911 caller, as well as an estimated distance between the at least one base station and the 911 caller, can be determined utilizing TOA or TDOA techniques to enable the location of the caller. An emergency vehicle carrying the position locator can constantly monitor and move toward the location of the 911 caller calling from a wireless mobile unit.

    HIGH-SPEED DATA SERVICES USING MULTIPLE TRANSMIT ANTENNAS
    22.
    发明专利
    HIGH-SPEED DATA SERVICES USING MULTIPLE TRANSMIT ANTENNAS 未知

    公开(公告)号：CA2377539C

    公开(公告)日：2008-12-02

    申请号：CA2377539

    申请日：2000-06-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： FOSCHINI GERARD JOSEPH ,  HUANG HOWARD C ,  VISWANATHAN HARISH

    IPC: H04B7/06 ,  H04B1/707 ,  H04B7/08 ,  H04B7/26 ,  H04L1/06

    Abstract: High-speed wireless data systems and methods are described for simultaneously supporting multiple data users, including flexible mixed-traffic services, using an illustrative CDMA architecture. Embodiments are compatible with current and third generation CDMA systems, while achieving spectral efficiencies that are in some cases an order of magnitude or more higher. Embodiments advantageously employ multiple antennas at the transmitter and receiver and code spreading to realize multiple access systems. Some illustrative receiver embodiments advantageously employ a decorrelating detector, while other features a decorrelating decision-feedback detector. In typical operation, each of a plurality of high-speed data streams directed to respective data users is demultiplexed into multiple (G>1) lower rate substreams, which are modulated by a CDMA spreading code and transmitted from M antennas at a base station. A receiver employs P antennas and multi-user detection to demodulate the G data substreams of its associated user. Performance measures for a variety of illustrative transmission and receiver configurations are derived using novel techniques for calculating system level capacities and spectral efficiencies (measured in bits per second per Hertz per sector). System design and configuration tradeoffs are readily made based on such performance determinations.

    25.
    发明专利
    未知

    公开(公告)号：BR9902994A

    公开(公告)日：2000-08-01

    申请号：BR9902994

    申请日：1999-07-27

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： HUANG HOWARD C ,  MAILAENDER LAWRENCE EUGENE ,  PAPADIAS CONSTANTINOS BASIL

    IPC: H04B1/10 ,  H04B1/7093 ,  H04B1/7103 ,  H04B1/7105 ,  H04B1/7115 ,  H04B7/216

    Abstract: Linear space-time multiuser detectors are described that combine array processing, rake detection, and multiuser detection and that satisfy a minimum mean-squared error criteria. Both embodiments can be implemented adaptively so as to account for unknown sources of interference. The adaptive implementation of the first embodiment of a linear space-time detector requires explicit estimates of the channel coefficients. On the other hand, the adaptive implementation of the second embodiment does not require these estimates since they can be adaptively obtained. Both of these detectors provide significant performance advantages over single-user space-time detectors and over multiuser detectors which do not account for CDMA interference from unknown sources.

    A method and apparatus for locating a wireless mobile unit
    26.
    发明专利
    A method and apparatus for locating a wireless mobile unit 未知

    公开(公告)号：AU6171299A

    公开(公告)日：2000-06-22

    申请号：AU6171299

    申请日：1999-11-26

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHEN BYRON HUA ,  CHIANG TUNG CHING ,  HUANG HOWARD C

    IPC: H04Q7/34 ,  G01S5/00 ,  G01S5/06 ,  G01S5/14 ,  G01S19/17 ,  G01S19/34 ,  G01S19/35 ,  H04Q7/30 ,  G01S5/12

    Abstract: A position locator enables the detection of an originating location of a 911 caller under various RF propagation positions. Through the use of a transceiver and global positioning unit in a portable position locator, even if only one base station receiving the 911 call can be detected, the origin of the 911 call can still be located. Utilizing information from the position locator and at least one base station, an estimated distance between the position locator and the 911 caller, as well as an estimated distance between the at least one base station and the 911 caller, can be determined utilizing TOA or TDOA techniques to enable the location of the caller. An emergency vehicle carrying the position locator can constantly monitor and move toward the location of the 911 caller calling from a wireless mobile unit.

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