Code division based time synchronization signal detecting device according to the multiple access system

摘要

PURPOSE: A detector of PP2S(Pulse Per 2 Seconds) in CDMA mode system is provided to generate interrupt signals and detect the interrupt signals in every PP2S period if the PP2S is generated from a time/frequency generator, thereby enhancing the reliability of the system. CONSTITUTION: A detector of PP2S in CDMA mode system comprises a PP2S generator(1), a PP2S detector(10), a fault signal generator(20) and a duplex controller(30). The PP2S generator(1) generates the PP2S becoming a synchronous reference of calling operation. The PP2S detector(10) detects whether the PP2S is output from the PP2S generator(1). The fault signal generator(20) generates fault signals if non-output of the PP2S is detected in the PP2S detector(10). The duplex controller(30) controls the switching of a duplexing time/frequency generator if the fault signals are generated from the fault signal generator(20).