| 摘要 |
PROBLEM TO BE SOLVED: To suppress power consumption while realizing high speed initial synchronization by conducting initial synchronization with a matched filter and using a sliding correlation device to conduct correlation calculation thereby stopping power supply to the matched filter. SOLUTION: A peak detection circuit TH connecting to a post stage of a matched filter MF receiving an input signal detects plural timings when an output of the matched filter MF exceeds a prescribed level, and a controller CTRL 1 receiving an output signal sets a basic timing of multiplication in each of sliding correlation devices SC1-SC3. Furthermore, the input signal is given to the sliding correlation devices SC1-SC3 via switches SW2-SW4, a DLL circuit (synchronization tracing device) connecting to the post stage fine-adjusts a timing of multiplication based on outputs of the sliding correlation devices SC1-SC3 and the timing from the controller CTRL 1 and interrupts the operation of the matched filter MF after the detection of the timing. |
