Accurate characterization of TWTA distortion in multicarrier operation by means of a correlation-based method

Complex payload architectures, together with the use of high-order digital modulations and advanced coding schemes, call for a new interpretation of the traveling-wave tube (TWT) linearity parameters. We propose a correlation-based methodology to assess in a simple, yet effective, manner the level of intermodulation (IM) generated by the TWT nonlinearity; this method is particularly suited to accurate IM evaluation in the presence of multicarrier operation with non-constant envelope modulations.

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