DD-a-OFDM augments classical OFDM with DD-domain channel estimation using TF pilots, transforming ICI into Gaussian noise, and shows lower BER than OFDM plus better estimation accuracy than OTFS at reduced pilot cost.
Deterministic pilot design and channel estimation for dow nlink massive MIMO-OTFS systems in presence of the fractional doppler,
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Delay-Doppler Domain Signal Processing Aided OFDM (DD-a-OFDM) for 6G and Beyond
DD-a-OFDM augments classical OFDM with DD-domain channel estimation using TF pilots, transforming ICI into Gaussian noise, and shows lower BER than OFDM plus better estimation accuracy than OTFS at reduced pilot cost.