| 摘要 |
PURPOSE:To judge if the transmission data is '1' or '0' and enable precise restoration by extracting modulation signal from the reception wave transmitted, synchronizing with No.1 series and No.2 series of the same PN symbol as the transmission side, and by sensing the correlational peak. CONSTITUTION:The transmission data (a) in entered into a two-series modulator 11, and either of two PN symbol series is emitted as an output (b). That is, the two-series modulator 11 emits No.1 series PN 1, in response for ex. to '0' and No.2 series PN 2 in response to '1' selectively, and it is delivered to a transmission path via a transmission interface 12. Also a reception interface 13 makes demodulation of the carrier or separation from the power line, and this output (c) is entered into a two-series demodulator 14, and either '1' or '0' of transmission data is obtained as reception data (e). The correlational peak output is presented on either path period by period by thus taking the correlation. Judgement of either '1' or '0' of the current data can be made from which path the correlational peak output appears on, that enables precise restoration. |
