公开(公告)号：US5818867A

公开(公告)日：1998-10-06

申请号：US708807

申请日：1996-09-09

申请人： Donald J. Rasmussen ,  Timothy P. Dempsey ,  Daniel D. Shearer, III

发明人： Donald J. Rasmussen ,  Timothy P. Dempsey ,  Daniel D. Shearer, III

IPC分类号： H04B1/707 ,  H04L27/20 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

CPC分类号： H04B1/707 ,  H04L27/2014

摘要： A modulator device is disclosed for a spread spectrum communication system which generates a modulated signal from incoming data. The device includes a QPSK portion for separating the incoming data into two data channels and for further spreading the two channels over a wide bandwidth according to a predetermined spreading code. A phase mapping element coupled to the QPSK portion for processing both channels in order to minimize spectral regrowth of the modulated signal by preventing the RF envelope deviation from going close to zero. Pulse shaping elements coupled to the phase mapping element for further processing each channel in order to improve the modulator spectral efficiency and minimize adjacent channel interference. A quad-mixer coupled to the pulse shaping elements for combining both channels into a recombined signal and for further modulating the recombined signal according to a predetermined carrier frequency.

摘要翻译： 公开了一种用于从输入数据生成调制信号的扩频通信系统的调制器装置。 该装置包括用于将输入数据分离为两个数据信道并用于根据预定扩展码在宽带宽上进一步扩展两个信道的QPSK部分。 耦合到QPSK部分以用于处理两个信道的相位映射元件，以便通过防止RF包络偏差接近于零来最小化调制信号的频谱再生长。 脉冲整形元件耦合到相位映射元件，用于进一步处理每个通道，以便提高调制器频谱效率并使相邻信道干扰最小化。 耦合到脉冲整形元件的四混频器，用于将两个信道组合成重组信号，并根据预定载波频率进一步调制重组信号。