| 摘要 |
The cells of a wireless communications system can be subdivided into smaller subcells, in each of which the available radio frequencies can be re-use d to allow denser use of the system. To avoid having to run hard-wired communications links to broadcast antennas of the subcells, substantially unguided, free-space, optical communication is used between the antenna that formerly served the cell and the subcell antennas. The existing hard-wired connection from the central antenna to the rem ainder of the wireless communications system infrastructure continues to be used for commu nication to and from the cell.
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