Adjacent Channel Interference for Turbo-Coded APSK

A study of the effects of interference caused by adjacent channels on the performance of turbocoded 16and 32-APSK. Included in our discussion is the spectral regrowth in the nonlinear power amplifier when driven by a non-constant envelope modulation. Ultimately, we present a set of channel spacing guidelines when using turbo-coded APSK for aeronautical telemetry.