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Zak-OTFS Implementation via Time and Frequency Windowing
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DOI：10.1109/TCOMM.2024.3366403.png)
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Abstract
En 中文
This paper presents an efficient practical Zak-OTFS modulation implementation using time and frequency windowing methods. We present two general classes of delay-Doppler (DD) twisted convolution (TC) filters (Type-1 and Type-2), and show that they can be realized by time and frequency windowing functions. We then propose practical methods to generate time domain Zak-OTFS signals, for actual transmission, using the windowing functions. For Type-1, the signals are generated using an interpolation filter. For Type-2, they are generated using a form of precoded OFDM. We show that this allows a wide variety of pulse shapes to be implemented in practice for Zak-OTFS modulation. This was not previously possible. We also show that the Type-2 signals are more spectrally efficient than their Type-1 counterparts. Finally, we compare the channel predictability of the two implementations.
Keywords:
Time-domain analysis
OFDM
Convolution
Time-frequency analysis
Symbols
Doppler effect
Delays
OTFS
delay-Doppler domain
Zak-OTFS
Zak transform
twisted convolution filters
time-frequency windowing
channel predictability
Journal
IF:
8.3
Papers:
1.2W
Citations:
3.6W
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Cited Papers