| 摘要 |
The invention provides a cellular communication system with at least one central station (18) and a plurality of remote stations (20). The central station transmits a synchronizing signal to the remote stations. When a remote station (m) wishes to initiate a call to another remote station (n) via the central station, it transmits a primary call signal to the central station, and the operation of the remote station and the central station are synchronized. The central station then sends a secondary call signal to the called remote station, and the operation of this remote station is also synchronized with the central station. The synchronizing signal typically comprises an in-phase and a quadrature carrier, modulated by first and second synchronization codes which have low cross-correlation, such as maximal length pseudo-noise codes of the class which are used to generate Gold codes. <IMAGE> |
