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1. WO2020023248 - PROCÉDÉS DE COEXISTENCE DE RADARS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

What is claimed is:

1. A method for detecting a target using radar signals implemented by a user equipment (UE), comprising:

selecting, from a codebook of waveform parameters, a plurality of waveform parameters for transmitting a corresponding plurality of chirps associated with a radar waveform;

transmitting the plurality of chirps according to the corresponding plurality of waveform parameters;

receiving a reflected radar waveform from the target comprising a plurality of reflected chirps corresponding to the plurality of chirps; and

processing the reflected radar waveform based at least in part on the plurality of waveform parameters.

2. The method according to claim 1, wherein the plurality of waveform parameters comprises at least three different waveform parameters.

3. The method according to claim 1, wherein the selecting the plurality of waveform parameters from the codebook comprises randomly selecting the plurality of waveform parameters from the codebook.

4. The method according to claim 1, wherein the plurality of waveform parameters comprises a plurality of pairs of waveform parameters, each pair of waveform parameters comprising a chirp slope and a frequency offset.

5. The method according to claim 4, wherein the transmitting the plurality of chirps according to the plurality of waveform parameters comprises transmitting each chirp of the plurality of chirps according to a different pair of waveform parameters than the preceding chirp.

6. The method according to claim 4, further comprising: transmitting a first chirp of the plurality of chirps according to a first pair of waveform parameters of the plurality of waveform parameters; and

transmitting, consecutively to the first chirp, a second chirp of the plurality of chirps according to a second pair of waveform parameters of the plurality of waveform parameters different than the first pair of waveform parameters.

7. The method according to claim 6, further comprising: transmitting a third chirp of the plurality of chirps according to a third pair of waveform parameters of the plurality of waveform parameters different than the second pair of waveform parameters.

8. The method according to claim 7, wherein the transmitting the third chirp comprises transmitting the third chirp consecutively to the second chirp.

9. The method according to claim 4, wherein each chirp slope depends on a corresponding first parameter and each frequency offset depends on the corresponding first parameter and a corresponding second parameter.

10. The method according to claim 9, wherein each pair of waveform parameters satisfies the following parameterization relationship:


where β(m) is the chirp slope, f0(m) is the frequency offset, q(m) is the first parameter, u(m) is the second parameter, B is a frequency range of each chirp of the plurality of chirps, and Tc is a time period of each chirp of the plurality of chirps.

11. The method according to claim 10, wherein:

BTc is a prime number.

12. The method according to claim 4, further comprising: applying a phase modulation to two or more chirps of the plurality of chirps before transmitting the two or more chirps to reduce coherent addition of chirps of the plurality of chirps transmitted according to a same pair of waveform parameters.

13. The method according to claim 1, wherein each chirp of the plurality of chirps corresponds to a cycle of the radar waveform having a same constant time period Tc.

14. The method according to claim 1, wherein each reflected chirp of the plurality of reflected chirps corresponds to a transmitted chirp of the plurality of chirps and is associated with a same waveform parameter as the corresponding transmitted chirp, and wherein the processing the reflected radar waveform comprises:

identifying, based at least in part on a first reflected chirp associated with a first waveform parameter of the plurality of waveform parameters, a peak in a time delay dimension corresponding to a distance of the target; and

identifying, based at least in part on the first reflected chirp and a second reflected chirp associated with a second waveform parameter of the plurality of waveform parameters, a peak in a Doppler dimension corresponding to the doppler of the target.

15. The method of claim 14, wherein the processing the reflected radar waveform comprises:

applying a first Fourier transform to the first reflected chirp to identify the peak in the time delay dimension; and

applying a second Fourier transform to the first reflected chirp and the second reflected chirp to identify the peak in the Doppler dimension.

16. The method according to claim 15, wherein the processing the reflected radar waveform comprises:

applying a third Fourier transform to the second reflected chirp and equalizing a first phase of the first reflected chirp and a second phase of the second reflected chirp before applying the second Fourier transform.

17. The method according to claim 16, wherein the processing the reflected radar wave form comprises:

resampling the first reflected chirp and the second reflected chirp after applying the first Fourier transform and the third Fourier transform to align outputs of the first Fourier transform and the third Fourier transform before applying the second Fourier transform.

18. The method according to claim 1, wherein the radar waveform is a frequency modulated continuous wave (FMCW) waveform.

19. The method according to claim 1, wherein the radar waveform is a phase-coded frequency modulated continuous wave (FMCW) waveform.

20. An apparatus for detecting a target using radar signals implemented by a user equipment (UE), comprising:

means for selecting, from a codebook of waveform parameters, a plurality of waveform parameters for transmitting a corresponding plurality of chirps associated with a radar waveform;

means for transmitting the plurality of chirps according to the corresponding plurality of waveform parameters;

means for receiving a reflected radar waveform from the target comprising a plurality of reflected chirps corresponding to the plurality of chirps; and

means for processing the reflected radar waveform based at least in part on the plurality of waveform parameters.

21. The apparatus of claim 20, wherein the plurality of waveform parameters comprises at least three different waveform parameters.

22. The apparatus of claim 20, wherein the selecting the plurality of waveform parameters from the codebook comprises randomly selecting the plurality of waveform parameters from the codebook.

23. The apparatus of claim 20, wherein the plurality of waveform parameters comprises a plurality of pairs of waveform parameters, each pair of waveform parameters comprising a chirp slope and a frequency offset.

24. The apparatus of claim 23, wherein the means for transmitting the plurality of chirps transmits each chirp of the plurality of chirps according to a different pair of waveform parameters than the preceding chirp.

25. The apparatus of claim 23, wherein the means for transmitting the plurality of chirps

transmits a first chirp of the plurality of chirps according to a first pair of waveform parameters of the plurality of waveform parameters, and

transmits, consecutively to the first chirp, a second chirp of the plurality of chirps according to a second pair of waveform parameters of the plurality of waveform parameters different than the first pair of waveform parameters.

26. The apparatus of claim 25, wherein the means for transmitting the plurality of chirps transmits a third chirp of the plurality of chirps according to a third pair of waveform parameters of the plurality of waveform parameters different than the second pair of waveform parameters.

27. The apparatus of claim 20, wherein each reflected chirp of the plurality of reflected chirps corresponds to a transmitted chirp of the plurality of chirps and is associated with a same waveform parameter as the corresponding transmitted chirp, and wherein the means for processing the reflected radar waveform

identifies, based at least in part on a first reflected chirp associated with a first waveform parameter of the plurality of waveform parameters, a peak in a time delay dimension corresponding to a distance of the target, and

identifies, based at least in part on the first reflected chirp and a second reflected chirp associated with a second waveform parameter of the plurality of waveform parameters, a peak in a Doppler dimension corresponding to the doppler of the target.

28. The apparatus of claim 27, wherein the means for processing the reflected radar waveform

applies a first Fourier transform to the first reflected chirp to identify the peak in the time delay dimension, and

applies a second Fourier transform to the first reflected chirp and the second reflected chirp to identify the peak in the Doppler dimension.

29. An apparatus for detecting a target using radar signals implemented by a user equipment (UE), comprising:

a processor,

memory coupled to the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to

select, from a codebook of waveform parameters, a plurality of waveform parameters for transmitting a corresponding plurality of chirps associated with a radar waveform;

transmit the plurality of chirps according to the corresponding plurality of waveform parameters;

receive a reflected radar waveform from the target comprising a plurality of reflected chirps corresponding to the plurality of chirps; and

process the reflected radar waveform based at least in part on the plurality of waveform parameters.

30. A non-transitory computer-readable medium storing code for detecting a target using radar signals implemented by a user equipment (UE), the code comprising instructions executable by a processor to

select, from a codebook of waveform parameters, a plurality of waveform parameters for transmitting a corresponding plurality of chirps associated with a radar waveform;

transmit the plurality of chirps according to the corresponding plurality of waveform parameters;

receive a reflected radar waveform from the target comprising a plurality of reflected chirps corresponding to the plurality of chirps; and

process the reflected radar waveform based at least in part on the plurality of waveform parameters.