公开(公告)号：US5210775A

公开(公告)日：1993-05-11

申请号：US653895

申请日：1991-02-12

申请人： Yasuaki Takahara ,  Tomohiro Ezaki ,  Shigeyuki Sudo ,  Teiji Okamoto

发明人： Yasuaki Takahara ,  Tomohiro Ezaki ,  Shigeyuki Sudo ,  Teiji Okamoto

IPC分类号： H04L27/20

CPC分类号： H04L27/2092

摘要： A .pi./4 shift QPSK modulator for receiving digital signals and for outputting a modulated signal therefrom in accordance with each of the inputted digital signals. The .pi./4 QPSK modulator is utilized in a communication apparatus and includes a counter for counting the number of the inputted digital signals, a phase information arithmetic unit for receiving a value of an output from the counter and a value of each of the inputted digital signals for outputting phase information of the signal to be modulated, an arithmetic unit for performing an arithmetic operation on values representing an impulse response of the output phase information from the phase information arithmetic unit and outputting impulse response values in accordance therewith, and an accumulating unit for accumulating impulse response values outputted from the arithmetic unit and for performing an arithmetic operation for enabling generation of a .pi./4 shift QPSK modulated signal.

摘要翻译： 一种用于接收数字信号并根据每个输入的数字信号从其输出调制信号的π/ 4移位QPSK调制器。 pi / 4QPSK调制器用于通信设备中，并且包括用于对输入的数字信号的数量进行计数的计数器，用于接收来自计数器的输出值的相位信息运算单元和输入的数字信号的每一个的值 用于输出要调制的信号的相位信息的信号，用于对表示来自相位信息运算单元的输出相位信息的脉冲响应的值执行运算的运算单元，并输出与之相应的脉冲响应值;以及累积单元 用于累积从运算单元输出的脉冲响应值，并执行用于实现pi / 4移位QPSK调制信号的产生的算术运算。