| 摘要 |
PURPOSE:To simplify the return control of reply by dividing an occupied band used at multiple address communication into a required number and assigning the divisions exclusively to a reception station. CONSTITUTION:A transmission multiple a address data sent from an earth station 7 is modulated by a modulator 11 and amplified by an amplifier 12 and subjected to limit at a prescribed band by a band pass filter 13 and the result is sent from an antenna 3 through a switch 99. In the operation of reply data, the occupied band of a radio wave used for the transmission of a multiple address data is divided into the number of earth stations or over being an object of multiple address communication and each occupied band is assigned for the reply of one earth station. Each earth station sends the reply data by using the assigned occupied band. Since the occupied band of the reply person is narrower than that for the multiple access data, the transmission speed should be slower than the divided number, but it is no problem because the quantity of reply data per station is very less than the multiple address data in general. |
