| 摘要 |
PURPOSE:To simplify the circuit constitution by attaining synchronizing detection and demodulation without carrier wave regeneration at the receiving side in a system applying a digital modulating wave with synchronizing detection to demodulate. CONSTITUTION:A carrier signal is separated into two at a hybrid 2; one is supplied to a PSK modulator 3 so as to generate a PSK modulating wave signal 2', which is supplied to a polarizer 4 together with the other carrier wave signal 3', the result is converted respectively into V-polarized wave and H-polarized wave and transmitted. A receiving signal is applied at a polarizer 12 at the receiving side, where the signal is separated into a V-polarized wave and an H-polarized wave, the V-polarized wave is applied to a mixer 13 and the H- polarized wave is applied to a mixer 14 to generate respectively a PSK modulating wave signal 4' and a carrier wave output signal 5'. A phase detector 17 compares the phase of the PSK modulating wave signal 4' with that of the signal 5' so as to generate an output in response to the phase difference and a phase detecting signal 6' corresponding to an input data signal 1', and a discriminating circuit 22 performs discrimination and waveform regeneration and produces an output data signal 7'. |
