On-ground signal processing techniques enabling efficient amplification of multicarriers

Spectrally efficient transmission to meet the increasing demand and sharing of satellite capacity among different links to reduce mission costs are two key avenues charted for next-generation satellites. Joint amplification of multicarrier signals using a single high-power amplifier is an important aspect of satellite resource sharing. However, the inherent nonlinearity of the amplifier results in an increased adjacent-channel interference and peak-to-average power ratio that degrade power and spectral efficiencies while offsetting other potential benefits. This chapter describes signal processing techniques—predistortion at the gateway and equalization at the user terminal—that mitigate the interference and enable efficient joint onboard amplification.

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