Using data symbols with arbitrary waveforms for delay-Doppler channel estimation yields approximately 1.8 times better spectral efficiency than conventional pilot-based methods.
OTFS—A Mathematical Foundation for Communication and Rad ar Sensing in the Delay-Doppler Domain
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Delay-Doppler Channel Estimation using Arbitrarily Modulated Data Transmissions
Using data symbols with arbitrary waveforms for delay-Doppler channel estimation yields approximately 1.8 times better spectral efficiency than conventional pilot-based methods.