Wireless Communications Over Rapidly Time-Varying Channels

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Orthogonal Time-Frequency Space Modulation: A Promising Next-Generation Waveform (2021, background): “Hence, the potential multipath-scale diversity of the DD domain channel [4] can be beneﬁcially exploited.”
A Survey on Multicarrier Communications: Prototype Filters, Lattice Structures, and Implementation Aspects (2012, methodology): “Therefore, CP-OFDM does not follow matched filtering and constructs a bi-orthogonal scheme [3], [21], [43].”
Interference Cancellation and Iterative Detection for Orthogonal Time Frequency Space Modulation (2018, background): “The delay–Doppler domain provides an alternative representation of a time-varying channel geometry modeling mobile terminals and reflectors [7], [8].”
MIMO-OTFS in High-Doppler Fading Channels: Signal Detection and Channel Estimation (2018, background): “Also, let RCP = [0M×CP IM ] denote the M × L the matrix that removes the cyclic prefix for one block [19].”
Channel Estimation for Orthogonal Time Frequency Space (OTFS) Massive MIMO (2019, background): “, Np = 6 [41] (the path delays of Ns subpaths of a dominant path are regarded as the same [43]), the delay-Doppler-angle channel H is sparse along the delay dimension `.”
The Mystery of Gabor Frames (2014, methodology): “To mention two important applications, Gabor frames are used in speech processing and in the analysis of music signals [19] (under the name “phase vocoder”) and in wireless transmission with OFDM [9,53,79,80].”