The authors extend multiple-mode index modulation to AFDM, encoding bits in both the selected constellation modes and their chirp arrangement, and report roughly 1.5 dB BER gains over prior schemes at equal spectral efficiency.
AFDM-SCMA: A promising waveform for massive connectivity over high mobility channels,
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Multiple-Mode Affine Frequency Division Multiplexing with Index Modulation
The authors extend multiple-mode index modulation to AFDM, encoding bits in both the selected constellation modes and their chirp arrangement, and report roughly 1.5 dB BER gains over prior schemes at equal spectral efficiency.