| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a synchronizing method in up-link suitable for a one-to-N communication system to which a synchronous CDM method is applied. <P>SOLUTION: A center node device at establishment of synchronization transmits repeatedly a transmission permission signal containing varied transmission phases to an edge node device, and the edge node device transmits signals in the transmission phase of the transmission permission signal. The center node device judges whether the signal is effectively received in each transmission phase or not, based on the dispersion demodulation output signal for a fixed signal period in the reception signal, and determines optimum transmission phase to make the edge node device set an optimum transmission phase. The center node device, during synchronous tracking, allows the relative phase of the dispersion demodulation output signal and sampling clock to be oscillated for each reception signal only during a fixed signal period of the reception signal. It then confirms the optimum transmission phase from the edge node device to correct the transmission phase from the edge node device as required. <P>COPYRIGHT: (C)2007,JPO&INPIT |
