| 摘要 |
PURPOSE:To attain data transmission with a small capacity without ensuring other data line than that for a main signal with respect to the satellite communication system by the TDMA system implementing data transmission between stations in which the line for the main signal has already been secured. CONSTITUTION:A unique word of a burst sent from a transmission station 1 is inverted logically by a preamble generating section 3 in response to a serial sub signal data other than a main signal data and the result is multiplexed on the main signal data and the multiplexed data is sent, and a reception station separates the preamble from the main signal data and a unique word detection section 6 detects the coincidence/dissidence of inversion in the said unique word in the said preamble to extract the said sub signal data thereby securing a serial data line. |
