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    • 16. 发明授权
    • Transmitted reference spread spectrum communications system
    • 传输参考扩频通信系统
    • US5761238A
    • 1998-06-02
    • US676013
    • 1996-07-05
    • John Anderson Fergus RossIrfan AliJohn Erik HersheyStephen Michael HladikGary Jude SaulnierMichael Paul Weir
    • John Anderson Fergus RossIrfan AliJohn Erik HersheyStephen Michael HladikGary Jude SaulnierMichael Paul Weir
    • H04B1/707H04B7/26H04B1/69
    • H04B1/707
    • A low complexity and low cost transmitted reference spread spectrum communications system provides several methods of generating a suitable wideband carrier, a method for combining the wideband carrier with a narrowband modulated wideband carrier, and a number of implementations of a simple, inexpensive receiver for the transmitted reference communications system. The transmitter includes a balanced modulator for modulating a wideband spreading signal with a narrowband message signal to generate a wideband carrier. A signal combiner combines the wideband carrier with a narrowband modulated wideband carrier to generate a transmitted reference spread spectrum signal. The receiver includes a selectable time delay device having a plurality of taps for receiving a detected received signal from the transmitter. A tap selector selects a delayed signal from the selectable time delay device. A mixer combines output signals of the selectable time delay device and the tap selector, and a leaky integrator receives the mixer output signal and controls the tap selector. The leaky detector generates the narrowband message signal.
    • 低复杂度和低成本传输的参考扩频通信系统提供了几种产生合适的宽带载波的方法,一种用于将宽带载波与窄带调制宽带载波组合的方法,以及用于传输的简单,便宜的接收机的多种实施方式 参考通信系统。 发射机包括用于利用窄带消息信号调制宽带扩频信号以产生宽带载波的平衡调制器。 信号组合器将宽带载波与窄带调制宽带载波组合以产生发射的参考扩展频谱信号。 接收机包括具有多个抽头的可选择的时间延迟装置,用于从发射机接收检测到的接收信号。 分接选择器选择来自可选时延装置的延迟信号。 混频器组合可选时延装置的输出信号和分接选择器,泄漏积分器接收混频器输出信号并控制分接选择器。 泄漏检测器产生窄带消息信号。