Details

Autor(en) / Beteiligte

• Gopalam, Swaroop
• Collings, Iain B.
• Hanly, Stephen V.
• Inaltekin, Hazer
• Pillai, Sibi Raj B.
• Whiting, Philip

Titel

Zak-OTFS Implementation via Time and Frequency Windowing

Ist Teil von

• IEEE transactions on communications, 2024-07, Vol.72 (7), p.3873-3889

Ort / Verlag

IEEE

Erscheinungsjahr

2024

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• 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.