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    • 4. 发明授权
    • Multi-antenna/multi-receiver array diversity system
    • 多天线/多接收机阵列分集系统
    • US07457602B2
    • 2008-11-25
    • US11226827
    • 2005-09-14
    • Saeed S. GhassemzadehRichard Henry ErvingRobert Raymond Miller, IIChristopher W. Rice
    • Saeed S. GhassemzadehRichard Henry ErvingRobert Raymond Miller, IIChristopher W. Rice
    • H04B1/06
    • H04B7/0808H04B7/082H04B7/0857H04B7/0874H04B7/10
    • The present invention is a system for increasing Signal-to-Noise Ratio (SNR) in a wireless communication system comprising a plurality of antennas each antenna providing a signal, a device for selecting a subset of signals provided by the plurality of antennas, a maximum ratio combiner for summing the selected subset of signals provided by the plurality of antennas, and a decision device for measuring the selected subset of signals against a predefined threshold. The device for selecting the subset of signals is coupled to the plurality of antennas. The maximum ratio combiner is coupled to the selected subset of signals and the decision device for measuring the selected subset of signals against a predefined threshold. The decision device is coupled to the selecting device such that one selected signal of the selected subset of signals is replaced by an unused signal provided by the plurality of antennas.
    • 本发明是一种用于在无线通信系统中提高信噪比(SNR)的系统,包括多个天线,每个天线提供信号,用于选择由多个天线提供的信号子集的装置,最大值 用于对所选择的由所述多个天线提供的信号子集进行求和的判定装置,以及用于根据预定阈值测量所选择的信号子集的判定装置。 用于选择信号子集的装置耦合到多个天线。 最大比合并器耦合到所选择的信号子集,以及用于根据预定阈值测量所选择的信号子集的判定装置。 决定装置耦合到选择装置,使得所选择的信号子集的一个选择信号被由多个天线提供的未使用信号所取代。
    • 7. 发明授权
    • Method and system for testing subscriber loops using touchtone telephone signals
    • 使用按键电话信号测试用户回路的方法和系统
    • US06707886B2
    • 2004-03-16
    • US10074281
    • 2002-02-12
    • Richard Henry ErvingMaura Elizabeth MarcusRobert Raymond Miller, IIChristopher W. Rice
    • Richard Henry ErvingMaura Elizabeth MarcusRobert Raymond Miller, IIChristopher W. Rice
    • H04M124
    • H04M1/24H04M3/2209H04M3/30H04M3/487H04Q1/45
    • A subscriber loop test apparatus relates to the testing of a subscriber loop by the use of a touchtone telephone. The touchstone buttons on a telephone provide Dual-Tone, Multiple Frequencies for each key pressed. For example, referring to FIG. 1, pressing the ‘3’ key causes tones at 697 and 1477 Hz to be sent across the telephone line. Pressing a sequence of keys provides discrete coverage of the frequency band from 697 to 1477 Hz, through the use of the touchtone telephone. The frequency band from 697 to 1477 Hz can be characterized in this fashion. Information about the line: loop loss (loop length), presence of bridge taps (i.e., excessively long bridge taps in particular) or loading coils, and the presence of Digital Loop Carriers (DLCs), et cetera. The use of the switch-hook flash provides the ability to determine the channel (impulse) response of the loop, including any noise and hum that may be on the loop due to imbalance or coupled interference.
    • 用户环路测试设备涉及通过使用按键电话测试用户回路。 电话上的试金石按钮为每个按键提供双音,多频。 例如,参考图1。 1,按“3”键可使697和1477 Hz的音调通过电话线发送。 通过使用按键电话,按下一系列键可以提供从697到1477 Hz的频段的离散覆盖。 可以以这种方式表征697至1477Hz的频带。 关于线路的信息:环路损耗(环路长度),桥接抽头的存在(特别是过长的桥接器)或负载线圈,以及数字环路载波(DLC)的存在等。 使用开关挂钩闪存提供了确定回路的通道(脉冲)响应的能力,包括由于不平衡或耦合干扰而可能在回路上的任何噪声和嗡嗡声。