| 摘要 |
A synchronization procedure for a multipoint-to-point CDMA network ( 2 ), which minimizes the influence on the information transmission. Instead of interleaving communications and synchronization signals timewise, a simultaneous emission is proposed, in which the synchronization signals are superimposed on the communications signals. The synchronization signals are coded with a special synchronization code ( 6 ), which does not correspond to the CDMA communications code of the information signals, e.g Barker code. In addition, the synchronization signals are sent at a lower amplitude compared with the communications signals. The synchronization signals are also modulated ( 7 ) prior to sending, in particular using alternating multiplication by +1 and -1. On the receiving side ( 3 ), the synchronization signals are detected by demodulation ( 12; 15 ), correlation ( 13; 16 ) and subsequent accumulation. The transmission capacity for the communications signals is maximized by this procedure and the influence of the synchronization signals on the communications signals minimized.
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