CPC H04W 52/52 (2013.01) [H04B 1/59 (2013.01); H04B 7/18517 (2013.01); H04B 7/19 (2013.01); H04B 7/2621 (2013.01); H04W 52/243 (2013.01)] | 5 Claims |
1. A satellite communications system comprising:
a ground controller;
a decode-and-forward satellite transponder having a transponder front end including a digital channelizer and a predistorter; and
a digital high-power amplifier;
wherein the ground controller is configured to transmit multiple-access frequency-division-multiplexed signals to the decode-and-forward satellite transponder;
wherein the decode-and-forward satellite transponder is configured to down-convert the signals received from the ground controller at the transponder front end;
wherein the digital channelizer is configured to convert the signals received from the ground controller into a single sample stream and feed the single sample stream through the predistorter into the single digital high-power amplifier;
wherein the single digital high power amplifier is configured to amplify each input sample of the sample stream in sample-by-sample fashion and generate a discrete output; and
wherein the decode-and-forward satellite transponder is configured to convert the output of the digital high power amplifier to a continuous time signal and up-convert the output with a main carrier frequency for down-link transmission to multiple-access ground users.
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