Guard interval-based orthogonal time frequency space waveform

1. A transmitter network node for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory and configured to cause the transmitter network node to:

generate a guard interval (GI)-based orthogonal time frequency space (OTFS) waveform comprising at least one defined sequence associated with at least one GI in a time domain corresponding to the GI-based OTFS waveform; and

transmit at least one signal based on the GI-based OTFS waveform.

2. The transmitter network node of claim 1 , wherein the at least one defined sequence comprises at least one of a head sequence or a tail sequence.

3. The transmitter network node of claim 1 , wherein the at least one defined sequence comprises at least one set of zero samples.

4. The transmitter network node of claim 1 , wherein the at least one defined sequence comprises at least one set of unique word samples.

5. The transmitter network node of claim 1 , wherein the one or more processors, to cause the transmitter network node to generate the GI-based OTFS waveform, are configured to cause the transmitter network node to:

append at least one of a set of tail samples or a set of head samples to a set of data samples to generate a modified set of data samples; and

provide the modified set of data samples to a discrete Fourier transform (DFT) component.

6. The transmitter network node of claim 5 , wherein a quantity of samples in the at least one of the set of tail samples or the set of head samples is based on a ceiling function associated with a quantity of samples in the GI-based OTFS waveform.

7. The transmitter network node of claim 1 , wherein the one or more processors, to cause the transmitter network node to generate the GI-based OTFS waveform, are configured to cause the transmitter network node to:

provide a first set of data samples to a discrete Fourier transform (DFT) component;

generate a first transformed set of data samples using the DFT component;

generate a second transformed set of data samples using an inverse fast Fourier transform (IFFT) component; and

append a set of tail samples to the second transformed set of data samples.

8. The transmitter network node of claim 1 , wherein the one or more processors, to cause the transmitter network node to generate the GI-based OTFS waveform, are configured to cause the transmitter network node to:

append at least one of a set of zero tail samples or a set of zero head samples to a set of data samples to generate a modified set of data samples;

provide the modified set of data samples to a discrete Fourier transform (DFT) component;

generate a first transformed set of data samples using the DFT component;

generate a second transformed set of data samples using an inverse fast Fourier transform (IFFT) component; and

append a set of unique word tail samples to the second transformed set of data samples.

9. The transmitter network node of claim 1 , wherein the one or more processors are further configured to cause the transmitter network node to receive configuration information associated with the GI-based OTFS waveform, and wherein the one or more processors, to cause the transmitter network node to generate the GI-based OTFS waveform, are configured to cause the transmitter network node to generate the GI-based OTFS waveform based on the configuration information.

10. The transmitter network node of claim 9 , wherein the one or more processors, to cause the transmitter network node to receive the configuration information, are configured to cause the transmitter network node to receive a radio resource control communication including the configuration information.

11. The transmitter network node of claim 1 , wherein the one or more processors are further configured to cause the transmitter network node to receive an activation communication, and wherein the one or more processors, to cause the transmitter network node to generate the GI-based OTFS waveform, are configured to cause the transmitter network node to generate the GI-based OTFS waveform based on the activation communication.

12. The transmitter network node of claim 11 , wherein the activation communication comprises at least one of a medium access control control element (MAC CE) or downlink control information (DCI).

13. The transmitter network node of claim 1 , wherein the one or more processors, to cause the transmitter network node to transmit the at least one signal, are configured to cause the transmitter network node to transmit a plurality of signals comprising:

a first symbol comprising the GI-based OTFS waveform, the GI-based OTFS waveform comprising at least one of a zero header or a zero tail, and

a second symbol comprising an additional GI-based OTFS waveform, the additional GI-based OTFS waveform comprising at least one of a unique word header or a unique word tail.

14. The transmitter network node of claim 13 , wherein the first symbol is transmitted before the second symbol, and wherein the one or more processors, to cause the transmitter network node to transmit the at least one signal, are configured to cause the transmitter network node to transmit a gap symbol between the first symbol and the second symbol.

15. The transmitter network node of claim 14 , wherein the gap symbol comprises at least one of a GI-based orthogonal frequency division multiplexing (OFDM) signal or a GI-based discrete Fourier transform spread OFDM signal.

16. The transmitter network node of claim 13 , wherein the first symbol is transmitted after the second symbol, and wherein the one or more processors, to cause the transmitter network node to transmit the at least one signal, are configured to cause the transmitter network node to transmit a tail-only symbol between the second symbol and the first symbol.

17. The transmitter network node of claim 16 , wherein the tail-only symbol comprises at least one of a tail-only GI-based orthogonal frequency division multiplexing (OFDM) signal or a tail-only GI-based discrete Fourier transform spread OFDM signal.

18. A receiver network node for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory and configured to cause the receiver network node to:

receive at least one signal based on a guard interval (GI)-based orthogonal time frequency space (OTFS) waveform comprising at least one defined sequence associated with at least one GI in a time domain; and

decode the at least one signal based on the at least one defined sequence.

19. The receiver network node of claim 18 , wherein the at least one defined sequence comprises at least one of a head sequence or a tail sequence.

20. The receiver network node of claim 18 , wherein the at least one defined sequence comprises at least one set of zero samples.

21. The receiver network node of claim 18 , wherein the at least one defined sequence comprises at least one set of unique word samples.

22. The receiver network node of claim 18 , wherein the one or more processors are further configured to cause the receiver network node to transmit configuration information associated with the GI-based OTFS waveform, wherein the GI-based OTFS waveform is based on the configuration information.

23. The receiver network node of claim 18 , wherein the one or more processors are further configured to cause the receiver network node to transmit an activation communication, wherein the GI-based OTFS waveform is based on the activation communication.

24. The receiver network node of claim 18 , wherein the one or more processors, to cause the receiver network node to receive the at least one signal, are configured to cause the receiver network node to receive a plurality of signals comprising:

a first symbol comprising the GI-based OTFS waveform, the GI-based OTFS waveform comprising at least one of a zero header or a zero tail, and

a second symbol comprising an additional GI-based OTFS waveform, the additional GI-based OTFS waveform comprising at least one of a unique word header or a unique word tail.

25. The receiver network node of claim 24 , wherein the first symbol is received before the second symbol, and wherein the one or more processors, to cause the receiver network node to receive the at least one signal, are configured to cause the receiver network node to receive a gap symbol between the first symbol and the second symbol.

26. The receiver network node of claim 24 , wherein the first symbol is received after the second symbol, and wherein the one or more processors, to cause the receiver network node to receive the at least one signal, are configured to cause the receiver network node to receive a tail-only symbol between the second symbol and the first symbol.

27. A method of wireless communication performed by a transmitter network node, comprising:

generating a guard interval (GI)-based orthogonal time frequency space (OTFS) waveform comprising at least one defined sequence associated with at least one GI in a time domain corresponding to the GI-based OTFS waveform; and

transmitting at least one signal based on the GI-based OTFS waveform.

28. The method of claim 27 , wherein the at least one defined sequence comprises at least one of a head sequence or a tail sequence.

29. A method of wireless communication performed by a receiver network node, comprising:

receiving at least one signal based on a guard interval (GI)-based orthogonal time frequency space (OTFS) waveform comprising at least one defined sequence associated with at least one GI in a time domain; and

decoding the at least one signal based on the at least one defined sequence.

30. The method of claim 29 , wherein the at least one defined sequence comprises at least one of a head sequence or a tail sequence.