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• W2899406779 abstract "In this paper, we model M × N orthogonal time frequency space modulation (OTFS) over a P-path doubly dispersive channel with delays less than τ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>max</sub> and Doppler shifts in the range (ν <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>min</sub> ,ν <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>max</sub> ). We first derive in a simple matrix form the input-output relation in the delay-Doppler domain for practical (e.g., rectangular) pulse-shaping waveforms, next generalize it to arbitrary waveforms. This relation extends the original OTFS input-output approach, which assumes ideal pulse-shaping waveforms that are bi-orthogonal in both time and frequency. We show that the OTFS input-output relation has a simple sparse structure that enables one to use low-complexity detection algorithms. Different from previous work, only a single cyclic prefix is added at the end of the OTFS frame, significantly reducing the overhead, without incurring any penalty from the loss of bi-orthogonality of the pulse-shaping waveforms. Finally, we compare the OTFS performance with different pulse-shaping waveforms, and show that the reduction of out-of-band power may introduce nonuniform channel gains for the transmitted symbols, thus impairing the overall error performance." @default.
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• W2899406779 date "2019-01-01" @default.
• W2899406779 modified "2023-10-16" @default.
• W2899406779 title "Practical Pulse-Shaping Waveforms for Reduced-Cyclic-Prefix OTFS" @default.
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• W2899406779 doi "https://doi.org/10.1109/tvt.2018.2878891" @default.
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