| 摘要 |
PURPOSE:To improve the correction capability by using a forecast reception data train in a carrier wave regenerating circuit of the inverse modulation system so as to apply inverse modulation to a received modulation wave thereby regenerating a carrier wave without any phase skip. CONSTITUTION:A quadruture phase modulation wave inputted from a terminal 21 is applied to demodulators 1-3, a carrier wave is reproduced from a modulation wave, and the modulation wave is subject to orthogonal synchronism by using the carrier so as to extract two series of data, I and Q components. The two received data series are multiplied, the same coding as the transmission side is applied thereto and the recorded output and the received data series are compared so as to forecast the received data series when the phase of the reproduced carrier wave is a correct phase for the absolute phase detection. The forecast reception data train is used so as to apply inverse modulation to the received modulation wave by an inverse modulator 10. Thus, the carrier wave without any phase skip is reproduced. |
