NASA NTRS · 19860052801
16-QAM and trellis-coded 16-QAM on nonlinear channels
Abstract
The use of 16-QAM on bandlimited nonlinear satellite channels, in uncoded and trellis-coded form, for bandwidth efficient modulation (ideally 4 bps/Hz) is discussed. To avoid severe degradation due to AM/AM and AM/PM distortion, or to avoid the need for large back-off, predistorting the 16-QAM constellation at the modulator is considered. Performance for varying back-off settings for uncoded and coded 16-QAM is simulated, and it is found that the four-state trellis code has a coding gain of about 8 dB, larger than expected based on linear channel analysis, while the 16-state code gains only marginally beyond this.
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Lyons, M. T., Chung, H. Y., Wilson, S. G.. 1985-01-01. 16-QAM and trellis-coded 16-QAM on nonlinear channels. https://ntrs.nasa.gov/citations/19860052801
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