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DIGITAL CHANNELIZER WITH PREDISTORTER, HIGH-POWER AMPLIFIER, AND BEAMFORMING
DIGITAL CHANNELIZER WITH PREDISTORTER, HIGH-POWER AMPLIFIER, AND BEAMFORMING
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机译:具有预失真器,高功率放大器和波束成形的数字信道器
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摘要
A satellite communications system is disclosed, the system comprising a ground controller, a decode-and-forward (DF) satellite transponder, and a digital high-power amplifier (HPA). The DF is further comprised of a transponder front end including a digital channelizer and a predistorter. The ground controller is configured to transmit multiple-access frequency-division-multiplexed signals to the DF, where the DF is configured to down-convert the signals received at the transponder front end. The digital channelizer is configured to convert the signals received into a single sample steam and feed the stream through the predistorter into the single digital HPA, wherein the HPA is configured to amplify each input sample of the stream in sample-by-sample fashion and generates a discrete output. The DF is further configured to convert the output of the digital HPA 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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