| 摘要 |
A mobile communications system uses a communications satellite and a Mobile Telephone Switching Office (MTSO) and communicates with mobile units via the satellite. A cell site has a co-located cell site converter which converts satellite signals to signals for the MTSO and vice-versa. Remote converter sites communicate with the satellite and with the mobile units in given geographical areas. A single satellite link is sufficient for adequate RSA service. Frequency and phase differences among signals from the remote sites to the satellite are synchronized to avoid frequency- and phase-drift.
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