| 摘要 |
PURPOSE: To provide the telecommunication network which can reduce necessary conditions imposed on maximum signal frequencies of respective constituent components. CONSTITUTION: In a multiple-connection network, a main station is so constituted that it can discriminate signals sent from substations 2. To actualize that, SCMA(subcarrier multiple access) is used. This method modulates a transmitted signal as to a subcarrier having its frequency and then modulates it as to the main carrier of each substation 2. To reduce necessary conditions imposed on high frequency characteristics of electronic components needed for each network, subcarriers of a distribution signal and a return signal are so selected as to belong to the same frequency band. |
