| 摘要 |
PURPOSE:To accurately demodulate a sent data by providing a means which sets variably a detection time to detect a peak value of a main lobe appearing at a prescribed period with a correlation signal obtained through the correlation between a DS signal and the same spread code as that at a transmission side. CONSTITUTION:The correlation device decodes a DS signal subjected to a spread processing with a PN code from an information data from a transmission side and is provided with a shift register 1, a multiplier 2, a 1st adder 3, a threshold level detection circuit 4, a peak detection circuit 5, a window setting circuit 6, a state discrimination circuit 7, a 1st switch circuit 8, a 2nd switch circuit 9, a switch changeover circuit 10, an output device 11, a 2nd adder 12 and a decoder 13. When the DS signal subjected to spread processing with the PN code from the information data is sent from the transmission side and received and detected, the peak level of a main lobe in a correlation signal appearing at a prescribed period is detected within a detection time set variably within a prescribed range. Thus, the main lobe in the correlation signal is detected without being affected with a time difference by the clock signal between the transmission and reception and the sent data is accurately demodulated. |
