| 摘要 |
PURPOSE:To obtain the demodulating data with less error by executing waveform processing for the correlative function of a receiving signal and obtaining the correlative function improving S/N. CONSTITUTION:The receiving signal is a signal for which a specified PN code is modulated by data and correlation with the PN code is obtained by a correlative device 1. Then, the waveform processing is executed for an output signal 1a of this correlative device by a waveform processing circuit 2. For a correlative signal 2a where the waveform processing is executed, a correlative peak is detected by a correlative peak detecting circuit 3. The correlative signal 2a is demodulated by a demodulating circuit 4. By utilizing that a noise to be included in the correlative device output signal 1a is originally regardless of an ideal correlative signal and there is no correlation, the waveform processing circuit 2 executes correlative arithmetic between the correlative device output signal 1a and the self-correlative function of the PN code. Accordingly, for the correlative signal 2a passing through this waveform processing circuit 2, the noise is suppressed. |
