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公开(公告)号：US5737372A
公开(公告)日：1998-04-07
申请号：US503955
申请日：1995-07-19
CPC分类号： H04J13/00 , H04B1/707 , H04J3/0682
摘要： In a spread spectrum multipoint-to-point communication system there is provided a novel frequency to phase converter, for automatically synchronizing the PN codes of the user transmitters/receiver with the receiver/transmitter in the central hub. The highly accurate frequency to phase converter generates a highly accurate phase error signal for synchronizing the multiuser network. The frequency to phase converter includes a serial adder and a series to parallel converter and a shift register which integrates the highly accurate phase error signal values and produces a highly accurate frequency value which is applied to the input of the resident processor in the central hub transmitter/receiver. The central hub transmitter/receiver calculates the clock offset for synchronizing each of the user receiver transmitters and generates a clock adjusting signal which is transmitted to the user receiver/transmitters.
摘要翻译： 在扩展频谱多点对点通信系统中，提供了一种新颖的频率到相位转换器，用于将用户发射机/接收机的PN码与中央集线器中的接收机/发射机自动同步。 高精度的频率相位转换器产生用于同步多用户网络的高精度相位误差信号。 频率到相位转换器包括串行加法器和串并联转换器和移位寄存器，其对高精度的相位误差信号值进行积分，并产生高精度的频率值，该频率值被施加到中央集线器发送器中的驻留处理器的输入端 /接收器。 中央集线器发射机/接收机计算用于同步每个用户接收机发射机的时钟偏移量，并产生发送到用户接收机/发射机的时钟调整信号。
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公开(公告)号：US07822157B2
公开(公告)日：2010-10-26
申请号：US10334191
申请日：2002-12-31
申请人： Merle L. Keller , Samuel Charles Kingston , Steven Barham , Alan Earl Lundquist , Zachary C. Bagley , Warren Paul Willes , Raied N. Mazahreh , Steven J. McEntire
发明人： Merle L. Keller , Samuel Charles Kingston , Steven Barham , Alan Earl Lundquist , Zachary C. Bagley , Warren Paul Willes , Raied N. Mazahreh , Steven J. McEntire
CPC分类号： H04B1/7075 , H04B2201/70715
摘要： A digital communication system includes a generator for generating a plurality of pulse trains, each having a different timing, and pre-compensation circuitry for synchronizing the plurality of pulse trains to a timing signal. The system also includes comparison circuitry for simultaneously comparing a received burst code signal to each of the plurality of pulse trains, where the burst code signal is synchronized to the timing signal, and a detector for detecting which of the pulse trains is a closest temporal match to the burst code signal. The pre-compensation circuitry operates to reduce acquisition time and keep PN code uncertainties within the range of the comparison circuitry.
摘要翻译： 数字通信系统包括用于产生每个具有不同定时的多个脉冲串的发生器和用于将多个脉冲序列同步到定时信号的预补偿电路。 该系统还包括比较电路，用于同时比较所接收的脉冲串码信号与多个脉冲串中的每个脉冲序列，其中突发码信号与定时信号同步，以及检测器，用于检测哪个脉冲序列是最接近的时间匹配 到突发码信号。 预补偿电路用于减少采集时间并将PN码不确定度保持在比较电路的范围内。
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公开(公告)号：US06408017B1
公开(公告)日：2002-06-18
申请号：US08170603
申请日：1993-12-21
IPC分类号： H04K100
CPC分类号： H04B1/708
摘要： In a high speed, high processing gain PN spread spectrum acquisition system an analog signal comprising a high speed PN code is received and converted to a high speed digital format. A demuxer is employed to divided the high speed digital signal into lower speed multiplexed portions. The lower speed multiplexed portions of the digital signal are processed in a plurality of parallel channels which employ correlators coupled to coherent accumulators and non-coherent accumulators coupled to the output of the coherent accumulators to provide a signal having sufficient energy to permit detection of one of a plurality of partial PN replica codes as the one code which is synchronized with the received analog signal comprising a high speed PN code and to synchronize with the PN replica code generator.
摘要翻译： 高速处理增益PN扩频采集系统包含高速PN码的模拟信号被接收并转换为高速数字格式。 采用分解器将高速数字信号分成低速多路复用部分。 数字信号的低速复用部分在多个并行通道中被处理，多个并行通道使用耦合到相干累加器的相关器和耦合到相干累加器的输出的非相干累加器，以提供具有足够能量的信号，以允许检测 多个部分PN复制码作为与接收到的包含高速PN码的模拟信号同步的一个码，并与PN复制码生成器同步。
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