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    • 16. 发明授权
    • Method and apparatus for locating a wireless mobile unit
    • 用于定位无线移动单元的方法和装置
    • US06741863B1
    • 2004-05-25
    • US09215344
    • 1998-12-18
    • Tung C. ChiangByron H. ChenHoward Huang
    • Tung C. ChiangByron H. ChenHoward Huang
    • H04Q720
    • G01S19/17G01S5/0081G01S5/06G01S5/14G01S19/48G01S2205/006
    • 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.
    • 位置定位器使得能够在各种RF传播位置检测911呼叫者的始发位置。 通过在便携式位置定位器中使用收发器和全球定位单元,即使只能检测到一个接收到911呼叫的基站,也可以找到911呼叫的来源。 利用来自位置定位器和至少一个基站的信息,位置定位器和911呼叫者之间的估计距离以及至少一个基站和911呼叫者之间的估计距离可以使用TOA或TDOA来确定 启用呼叫者位置的技术。 携带位置定位器的紧急车辆可以不间断地监视和移动到来自无线移动单元的911呼叫者呼叫的位置。
    • 17. 发明授权
    • High-speed data services using multiple transmit antennas
    • 使用多个发射天线的高速数据业务
    • US06370129B1
    • 2002-04-09
    • US09587345
    • 2000-06-05
    • Howard Huang
    • Howard Huang
    • H04Q700
    • H04B7/0845H04B7/06H04B7/0615H04B7/0669H04B7/0891H04B2201/70703H04L1/0618
    • 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 others feature 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.
    • 描述了高速无线数据系统和方法,以使用说明性的CDMA架构同时支持多个数据用户,包括灵活的混合业务业务。 实施例与当前和第三代CDMA系统兼容,同时实现在某些情况下的数量级或更高的频谱效率。 实施例有利地在发射机和接收机处采用多个天线,并且代码扩展以实现多个接入系统。 一些说明性的接收机实施例有利地采用解相关检测器,而其他特征则具有去相关的判决反馈检测器。在典型的操作中,指向相应数据用户的多个高速数据流中的每一个被解复用为多(G> 1)较低速率 子载波,其由CDMA扩展码调制并且在基站处从M个天线发送。 接收机采用P天线和多用户检测来解调其相关用户的G数据子流。 使用用于计算系统级容量和频谱效率(以每个扇区每赫兹每秒的位数测量)的新技术,导出了各种说明性传输和接收机配置的性能测量。 系统设计和配置权衡很容易基于这样的性能测定。