| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain synchronizing follow-up (tracking) on the fluctuation of a reception level, and to attain stable reception by selecting and demodulating a correlator output (an inversion diffusion signal) in a timing with the most satisfactory reception quality in a constant time interval. SOLUTION: A delaying means 109 delays an inversion diffusion code, so that it can be matched with a reception timing detected by a search means 111. Next, a shift register 110, having plural output terminals, delays the delayed inversion diffusion code in a constant delay interval. Then, plural correlators 102 operate the inversion diffusion of a reception signal by calculating a correlation value between a digital base-band signal and each output of the shift register 110. Then, the outputs of the plural correlators 102 are temporarily stored in a memory 103. An optimal value detecting means 104 and a selecting means 105 read the memory 103 in a constant interval, and selects the correlator output with the most satisfactory reception quality. Then, a synchronization detection means 106 operates synchronization detection by using the selected correlator output.</p> |
