| 摘要 |
PROBLEM TO BE SOLVED: To shorten synchronization time by using the ones for which a pilot code for synchronization is shifted for the specified amount of a code cycle and multiplexed for a prescribed period for the pilot code for synchronization. SOLUTION: Only the pilot code PN21 for synchronization is transmitted immediately after starting preamble and the pilot code PN'22 for synchronization is multiplexed to the pilot code PN for synchronization and transmitted after the lapse of prescribed time. In this case, for a preamble pattern, as shown in 12, the correlation output of only the pilot code PN21 for synchronization is obtained immediately after starting preamble and the correlation output for the pilot code PN21 for synchronization and the pilot code PN'22 for synchronization is obtained after the lapse of the prescribed time. That is, as shown in 13, the correlation output signals of a cycle L are obtained immediately after starting preamble and the correlation output signals of the cycle L/2 are obtained after the lapse of the prescribed time. However, in the case of using a convolver in a correlation detection part, the correlation output signals of L/4 are obtaind. |
