| 摘要 |
<p>Linking of radio paging transmitters is accomplished through the utilization of TDM transmission on the same channel as that assigned to the paging service, thus eliminating the necessity of a separate channel for linkage of the remote transmitting sites to a central originating location. For data transmission, real time data is broadcast via a direct RF link to buffer storage at each of the remote transmitting sites, with the data being read out to each of the paging transmitters from the local buffers in a phase-adjusted synchronized fashion under control of sync signals generated at and broadcast from the central originating location. The data transmission rate from the central originating location to the remote sites may be made significantly higher than the radio paging data rate in order to minimize link time to minimize linkage overhead by reducing the amount of time the channel is used for linkage as opposed to paging. Additionally, analog material such as audio signals may be converted to digital signals and transmitted to the remote transmitting sites, with the digitized audio information being stored in buffers and converted back to audio when the buffer is read out. Directional antennas may be utilized between the central originating location and the remote transmitting sites to improve the signal to noise ratio over omni-directional broadcasting for increased link data rates.</p> |
