| 摘要 |
PURPOSE:To prevent mis-synchronization of a demodulation section due to correlation between channels by using two waves whose transmission frequencies are apart by a fine frequency DELTAf and corresponding the worst combination of the correlation to each wave. CONSTITUTION:Plural transmission stations sending a data to one receiving station 103 is divided into transmission station groups 101 and 102. Then the transmission station group 101 uses a frequency f1 as an IF of an IF local oscillator 6 and the transmission station group 102 uses a frequency f2 apart from the frequency f12 by the fine frequency DELTAf. The number of channels of this system is 60 and number of combinations where the worst correlation appears is 30 in pairs. Then they are divided into two as 1st and 2nd groups, the transmission station group 101 is assigned to the 1st group, and the transmission station group 102 is assigned to the 2nd group. |
