Discussion on modulation for 6GR

LG Electronics proposes considering Non-Uniform Constellation (NUC) as a candidate 6G modulation scheme, presenting 0.3-0.6 dB SNR gains at 10% BLER for 1024 1D-NUC over NR uniform QAM in AWGN and TDL-A/B/C channels with various delay spreads and UE speeds. They propose studying constellation shaping applicability specifically for existing 5G NR modulation orders (64 QAM to 1024 QAM), arguing that shaping techniques can mitigate challenges like increased PAPR, capacity gap to Shannon limit, and RF impairments that become more critical at higher modulation orders. They propose studying mixed modulation for 6GR, showing that alternating QPSK and 16QAM symbols achieves finer spectral efficiency granularity and maintains consistent performance across varying delay spreads, unlike conventional NR schemes which require supporting multiple modulation orders for the same spectral efficiency to handle different channel conditions.