Statistical evaluation of finite length digital modulation sequences

Abstract

By using properly selected test waveforms, one can accurately evaluate power amplifier performance for operation with digitally modulated signals. The waveforms must balance instrumentation constraints (such as fixed length sequences and circularity) against requirements to represent waveforms from the field (such as matching peak to average ratio, and spectral shape). This paper focuses on two-carrier WCDMA signals and uses the normalized power RMS error metric to quantify the impact of decresting. Additionally, the ensemble CCDF variation (ECV) plot is introduced as a qualitative tool to evaluate the differences between finite length test waveforms and fielded waveforms.