| 摘要 |
PURPOSE:To attain accurate decoding by taking synchronization of a transmission speed surely with a reception signal from a sender side and to reduce the power consumption. CONSTITUTION:An oscillator 12 recovers a recovered carrier signal S1 and a recovered carrier signal S2 whose frequency is higher than a symbol transmission speed of transmission data by 1/4 and a detector 14 obtains base band signals B1, B2. A clock signal Ck representing an identification timing of the base band signal B1 is recovered by a clock recovery device 15 based on a zero cross signal detected from the signals B1, B2. An identification device 16 discriminate data to be sent based on the clock signal Ck and the base band signal B1 to obtain a data string. A timing controller 17 detects a predetermined synchronization bit from the data string to control the operation in the unit of DMA burst signals and a zero cross signal is generated to a specific data pattern of QPSK to correct the identification timing for each symbol and data are decoded through the synchronization of the TDMA burst signal with the synchronization of the transmission speed of the reception signal Sa. |
