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    • 11. 发明授权
    • Parallel code matched filter
    • 并行代码匹配滤波器
    • US6130906A
    • 2000-10-10
    • US083193
    • 1998-05-22
    • Sorin DavidoviciEmmanuel KanterakisMichael HennedyKenneth J. KeyesJimmy Cuong Tran
    • Sorin DavidoviciEmmanuel KanterakisMichael HennedyKenneth J. KeyesJimmy Cuong Tran
    • H04B1/7093H04B1/707
    • H04B1/7093H04B2201/70707
    • A spread-spectrum receiver for time sharing a correlator for simultaneously receiving a plurality of parallel spread-spectrum signals. A combined multiplicity of symbols includes a multiplicity of symbols, simultaneously occurring during a symbol-time duration, from a plurality of spread-spectrum signals. A demultiplexer demultiplexes a sequence of the combined multiplicity of symbols into a plurality of symbol registers. Each of the symbol registers stores the chip-sequence signals corresponding to the combined multiplicity of symbols which were sent to the particular symbol register. A multiplexer selects a symbol register, other than the symbol register selected by the demultiplexer. The multiplicity of chip-sequence signals stored in the selected symbol register by the multiplexer are compared by a comparator with a multiplicity of replicas of the chip-sequence signals used to generate the spread-spectrum signals.
    • 一种用于时间共享相关器的扩频接收机,用于同时接收多个并行扩频信号。 符号组合的多个符号包括从多个扩展频谱信号同时出现在符号时间段期间的多个符号。 解复用器将组合的多个符号的序列解复用为多个符号寄存器。 每个符号寄存器存储对应于被发送到特定符号寄存器的组合的符号多项式的码片序列信号。 复用器选择符号寄存器,除了由解复用器选择的符号寄存器之外。 由多路复用器存储在所选择的符号寄存器中的码片序列信号的多重性被比较器与用于产生扩频信号的码片序列信号的多个复制进行比较。
    • 14. 发明授权
    • Fast phase estimation in digital communication systems
    • 数字通信系统中的快速相位估计
    • US6021157A
    • 2000-02-01
    • US16324
    • 1998-01-30
    • Emmanuel KanterakisSorin Davidovici
    • Emmanuel KanterakisSorin Davidovici
    • H03D3/22H04B1/707H04B1/7085H04L27/00H04L27/233H04K1/00H04L27/22
    • H04B1/7085H03D3/22H04B1/707H04L27/2332H04L2027/003H04L2027/0048
    • A system and method for synchronizing a Costas Loop for demodulating a received spread-spectrum signal having data and a first arbitrary phase angle, .phi.(t), using a phase detector, a phase unwrapping subsystem, an oscillator, a derotator and a decision device. A second arbitrary phase angle, .theta.(t), is generated from an in-phase component and a quadrature-phase component of the received spread-spectrum signal. The second arbitrary phase angle, .theta.(t), is proportional to the first arbitrary phase angle, .phi.(t). A value of .theta. proportional to .theta.(t) is then estimated. The estimated .theta. value is processed to obtain an estimate for the .phi.value, and a cosine and a sine of the estimated .phi. value are generated by the oscillator. The derotator derotates the in-phase-component and the quadrature-phase component of the received spread-spectrum signal with the cosine and the sine of the estimated .theta. value to generate a demodulated signal. The decision device evaluates the demodulated signal and outputs data.
    • 一种用于使用相位检测器,相位解包子系统,振荡器,解旋器和判定装置来同步用于解调具有数据和第一任意相位角(phi(t))的接收扩频信号的科斯塔斯循环的系统和方法 。 第二任意相位角θ(t)是从接收的扩频信号的同相分量和正交相位分量产生的。 第二任意相位角θ(t)与第一任意相位角phi(t)成比例。 然后估计与theta(t)成比例的θ值。 处理估计的θ值以获得phi值的估计,并且由振荡器产生估计的phi值的余弦和正弦。 解旋器利用估计的θ值的余弦和正弦消除接收的扩频信号的同相分量和正交相位分量,以产生解调信号。 判定装置评估解调信号并输出​​数据。