公开(公告)号：US5111479A

公开(公告)日：1992-05-05

申请号：US605258

申请日：1990-10-26

申请人： Shigeo Akazawa

发明人： Shigeo Akazawa

IPC分类号： H04B1/69 ,  H04B1/7075 ,  H04J13/00

CPC分类号： H04B1/707

摘要： A carrier sense circuit for sensing a carrier component of a received signal in a spread spectrum system includes a multiplier which produces a squared signal by multiplying the received signal by itself, a filter which extracts from the squared signal a carrier component of a spread spectrum signal included in the squared signal, and a detecting circuit which detects the level of the carrier component and which outputs a carrier sense signal when the level of the carrier component is greater than a predetermined level. The filter is a band pass filter having a central frequecny of 2f.sub.c where f.sub.c is the central frequency of the spread spectrum signal. Where the spread spectrum system includes an initial synchronization circuit, and a correlation arrangement which correlates the received signal with a reference signal to produce correlation pulses, a circuit can be provided to start the initial synchronization circuit in response to simultaneous occurrence of the carrier sense signal and one of the correlation pulses.

摘要翻译： 用于感测扩展频谱系统中的接收信号的载波分量的载波检测电路包括乘法器，其通过将接收信号本身乘以产生平方信号;滤波器，其从平方信号中提取扩展频谱信号的载波分量 以及检测电路，其检测载波分量的电平，并且当载波分量的电平大于预定电平时，输出载波检测信号。 滤波器是具有2fc的中心频率的带通滤波器，其中fc是扩频信号的中心频率。 在扩频系统包括初始同步电路的情况下，以及将接收信号与参考信号相关联以产生相关脉冲的相关布置，可以提供电路以响应于载波感测信号的同时发生而启动初始同步电路 和相关脉冲之一。

公开(公告)号：US4993044A

公开(公告)日：1991-02-12

申请号：US400823

申请日：1989-08-30

申请人： Shigeo Akazawa

发明人： Shigeo Akazawa

IPC分类号： H04B1/707 ,  H04B1/7073 ,  H04J13/00

CPC分类号： H04B1/70712

摘要： A spread-spectrum communication receiver uses two convolvers and a phase shifter to demodulate data from correlation outputs of the convolvers. The demodulated output is used to control the phase-shifting amount of the phase-shifter and gains of the correlation outputs.

摘要翻译： 扩频通信接收机使用两个卷积器和移相器来解调来自卷积器的相关输出的数据。 解调输出用于控制移相器的移相量和相关输出的增益。