Radiotelephone system that maintains synchronization between base and subordinate units while shifting carrier frequencies
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United States of America Patent
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Jul 21, 1992
Grant Date -
N/A
app pub date -
Jul 20, 1990
filing date -
Jul 28, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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