| 摘要 |
PURPOSE: A CDMA mobile communication system is provided to have a system in which synchronization deviation is suppressed, more radio channels can be secured without increasing the frequency for use, and guard timing can be reduced. And, a mobile unit and a base station are provided to be suitable for use in the CDMA mobile communication system. CONSTITUTION: In a code division multiple access mobile communication system, a communication signal is modulated and multiplexed with different diffusion codes and is used in date communication between a base station(30) and each of mobile units(40,41,42). The communication signal is a time division multiplex signal with a repeated frame having a plurality of time slots(TS0,TS1,TS2) assigned to different radio channels, respectively. A slot synchronous signal is produced in accordance with a reference clock signal of a global positioning system. The time slots are synchronized between the base station and each of the mobile units in accordance with the slot synchronous signal.
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