| 摘要 |
PURPOSE:To attain a data demodulation only with the envelope peak detection of the outputs of two convolvers by providing the two convolvers and constituting so that a spike waveform may appear in one convolver when the data of two successive two bits in a receiving signal are the same value and it may appear in the other convolver when they are different. CONSTITUTION:The receiving signal is inputted to convolvers 2 and 3. In the convolver 2, the convolution integration of a reference signal into which a signal generated in a local oscillator 6 by a PN code generated in a PN code generator 7 is modulated by a modulator 4 and the receiving signal is executed. In the convolver 3, by a signal where the exclusive OR operation of a clock signal to repeat a data '1' and a data '0' for every data bit generated by using a signal to show the head of the data generated from the PN code generator 7 and the PN code is executed, the convolution integration of the reference signal where the signal generated in the local oscillator 6 is modulated by a modulator 5 and the receiving signal is executed. In the two convolver, the synchronization of the receiving signal and the reference signal is obtained so that the partition of the data may be at the center of the convolver. The outputs of the convolvers 2 and 3 are envelope-detected by envelope detectors 8 and 9. |
