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1. 发明授权

US5133002A Radiotelephone system that maintains synchronization between base and subordinate units while shifting carrier frequencies 失效
标题翻译：无线电话系统，在移动载波频率的同时保持基站与下属单元之间的同步
公开(公告)号：US5133002A
公开(公告)日：1992-07-21
申请号：US556335
申请日：1990-07-20
申请人： Hajime Kikuchi , Kazuhiko Nishi , Youichi Kawaguchi
发明人： Hajime Kikuchi , Kazuhiko Nishi , Youichi Kawaguchi
IPC分类号： H04M1/725
CPC分类号： H04M1/72505
摘要： A radiotelephone system having a base unit and a plurality of subordinate units for carrying out radiocommunication between the base unit and the subordinate units. The base unit sends transmitting carriers to the subordinate units and gets receiving carriers from the subordinate units. The system includes a first frequency varying part for periodically shifting transmitting/receiving carrier frequencies of the base unit from a given frequency of one operating interval to another frequency of another operating interval. A first synchronizing signal part generates a synchronizing signal in synchronism with a time period determined from the shifting of the carrier frequencies. A second synchronizing signal part extracts a synchronizing signal from a receiving carrier signal received by each of the subordinate units. A second frequency varying part shifts receiving/transmitting carrier frequencies of each of the subordinate units from a frequency of one operating interval to another frequency of another operating interval in synchronism with a time period determined by the synchronizing signal extracted by the second synchronizing signal part.
摘要翻译：一种具有基本单元和多个从属单元的无线电话系统，用于在基本单元和从属单元之间执行无线电通信。基站发送载波到下级单元，从下级单元接收载波。该系统包括用于周期性地将基本单元的载波频率从一个操作间隔的给定频率周期性地移位到另一个操作间隔的另一个频率的第一频率变化部分。第一同步信号部分与从载波频率的移位确定的时间周期同步地产生同步信号。第二同步信号部分从由下属单元接收的接收载波信号中提取同步信号。第二频率变化部分将每个下属单元的接收/发送载波频率从由第二同步信号部分提取的同步信号确定的时间周期同步地从一个操作间隔的频率转移到另一个操作间隔的另一个频率。

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