| 摘要 |
<p>The number of high power amplifiers required for multi-channel satellite communications is reduced by a high power amplification of selected sets (1,5; 3,7) of signals in respective common amplifiers (76b1,76b2), with each set of combined signals consisting of channels whose frequency bands are mutually discrete and sufficiently separated in frequency that their third order intermodulation products (58,60) do not substantially overlap in frequency with any of the channels in the same set. The signals can be separated out again after amplification and transmitted as downlink signals, either individually from a dedicated downlink antenna (80b) or in combination with other channels from a common downlink antenna (80c).</p> |
