| 摘要 |
In a radio pager for receiving a paging signal of a superframe structure comprising a recurrent series of frames each containing a series of burst signals containing a synchronization field, a frame number field and an address field, one of the frames in each superframe being assigned to the pager. The pager comprises a receiver and a synchronizer connected to the receiver for establishing synchronization to a bit sequence in the synchronization field. A short warm-up period and a short time-out period are established before each of the burst signals of the assigned frame of a first superframe are received and a long warm-up period and a long time-out period are established before the burst signals of the assigned frame of a second superframe are received. The receiver is activated at the start of the short warm-up period advanced from the start of each burst signal of the assigned frame and a determination is made on whether synchronization is established within the subsequent short time-out period. If synchronization is not established, the receiver is deactivated at the end of the short time-out period, and if established, the receiver is deactivated after the end of the short time-out period. A long warm-up period and a long time-out period are then established and the receiver is deactivated. The receiver is reactivated at the start of the long warm-up period advanced from the start of the assigned frame of a second superframe, and determination is made on whether synchronization is established within the long time-out period. If synchronization is established, the receiver is deactivated at the end of the long time-out period, and if established, the receiver is deactivated after the end of the long time-out period. The short warm-up and short time-out periods are established again for reception of successive burst signals . <IMAGE> |
