| 摘要 |
PROBLEM TO BE SOLVED: To avoid loss of synchronization caused by fading for a long time and to reduce the power consumption in the case of configuration of a synchronization circuit for the direct spread spectrum communication system. SOLUTION: A desired wave power discrimination means 212 is provided to an output terminal, a sliding correlation device (SC) 204 takes correlation between a signal delaying an output of a reception section 201 by a time ΔTc and a spread code of a receiver outputted from a spread code generator 211 to detect a level of a synchronized desired wave. When the level is lower than a prescribed level, the operation of a delay circuit 203, SCs 205, 206, level detectors 207, 208 and an adder 209 is stopped to bring the operation of a phase locked loop PLL 210 into a flywheel operation and when the level is higher than the prescribed level, the operation stop is released to activate the PLL 210 normally. |
