Array geometries with identical sum co-arrays can have different identifiability at low waveform rank; a necessary condition reveals that unfavorable redundancy patterns in some redundant arrays prevent lossless rank reduction.
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Using data symbols with arbitrary waveforms for delay-Doppler channel estimation yields approximately 1.8 times better spectral efficiency than conventional pilot-based methods.
ODDM achieves impulse-like orthogonality in the sampled delay-Doppler domain, permitting relaxed local biorthogonality designs for multi-carrier signals under practical bandwidth and duration constraints.
citing papers explorer
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On the Impossibility of Lossless Waveform Rank Reduction for Certain Redundant Arrays
Array geometries with identical sum co-arrays can have different identifiability at low waveform rank; a necessary condition reveals that unfavorable redundancy patterns in some redundant arrays prevent lossless rank reduction.
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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.
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Multi-Carrier Modulation: An Evolution from Time-Frequency Domain to Delay-Doppler Domain
ODDM achieves impulse-like orthogonality in the sampled delay-Doppler domain, permitting relaxed local biorthogonality designs for multi-carrier signals under practical bandwidth and duration constraints.