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1. WO2020161537 - SCHÉMA DE PRÉCODAGE BASÉ SUR LA RÉCIPROCITÉ AMÉLIORÉE PAR COUVERTURE

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Claims

What is claimed is:

1. A method performed by a base station (102) for determining precoding information, the method comprising:

determining (200) channel estimates for at least a channel between the base station and another device;

determining (202) a plurality of precoding hypotheses based on the channel estimates;

determining (204) a Figure of Merit, FOM, for each of the plurality of precoding hypotheses; and

determining (206) the precoding information based on the FOM for each of the plurality of precoding hypotheses.

2. The method of claim 1 further comprising:

performing (300) matched filtering of received reference symbols and corresponding known reference symbols;

filtering (302) an output of the matched filtering based on a plurality of precoding hypotheses;

applying (304) a transform to the filtered output for the plurality of precoding hypotheses to produce a plurality of transformed precoding hypotheses;

calculating (306) a FOM for each of the plurality of transformed precoding hypotheses; and

selecting (308) a precoder that maximizes the FOM as the precoding information.

3. The method of any of claims 1 to 2 wherein the matched filtering is performed with at least one of the group consisting of: a Sounding Reference Signal, SRS, a Random Access Channel, RACFI, Demodulation Reference Signals, DMRS, a Channel State

Information Reference Signal, CSI-RS, Physical Uplink Control Channel, PUCCFI, and DMRS for PUCCH.

4. The method of claim 3 wherein the matched filtering is performed with the SRS and a Zadoff-Chu sequence inverted.

5. The method of any of claims 1 to 4 wherein the plurality of precoding hypotheses are chosen from at least one of the group consisting of: a codebook, a Grid of Beams, GoB, codebook, a New Radio, NR, Type 1 codebook, an NR Type 2 codebook, and a subset of any of these codebooks.

6. The method of any of claims 1 to 5 wherein the transform is chosen from the group consisting of: a Discrete Fourier Transform, DFT, an Inverse DFT, a Discrete Cosine

Transform, DCT, and an Inverse DCT.

7. The method of any of claims 1 to 5 wherein the transform is linear.

8. The method of any of claims 1 to 7 wherein the FOM is a maximum.

9. The method of claim 8 wherein the maximum is only performed over a limited range.

10. The method of claim 9 wherein the limited range is related to at least one of the group consisting of: a cyclic prefix and a delay spread of the channel.

11. The method of any of claims 1 to 10 wherein the FOM is proportional to an estimated Signal to Noise Ratio, SNR.

12. The method of any of claims 1 to 11 wherein the other device is a wireless device that operates in a NR communication network.

13. The method of any of claims 1 to 12 wherein the base station is a gNB.

14. A method performed by a wireless device (112) for determining precoding information, the method comprising:

determining (200) channel estimates for at least a channel between a base station and another device;

determining (202) a plurality of precoding hypotheses based on the channel estimates;

determining (204) a Figure of Merit, FOM for each of the plurality of precoding hypotheses; and

determining (206) the precoding information based on the FOM for each of the plurality of precoding hypotheses.

15. The method of claim 14 further comprising:

performing (300) matched filtering of received reference symbols and corresponding known reference symbols;

filtering (302) an output of the matched filtering based on a plurality of precoding hypotheses;

applying (304) a transform to the filtered output for the plurality of precoding hypotheses to produce a plurality of transformed precoding hypotheses;

calculating (306) a FOM for each of the plurality of transformed precoding hypotheses; and

selecting (308) a precoder that maximizes the FOM as the precoding information.

16. The method of any of claims 14 to 15 wherein the matched filtering is performed with at least one of the group consisting of: a Sounding Reference Signal, SRS, a Random Access Channel, RACFI, Demodulation Reference Signals, DMRS, a Channel State

Information Reference Signal, CSI-RS, Physical Uplink Control Channel, PUCCFI, and DMRS for PUCCH.

17. The method of claim 16 wherein the matched filtering is performed with the SRS and a Zadoff-Chu sequence inverted.

18. The method of any of claims 14 to 17 wherein the plurality of precoding hypotheses are chosen from at least one of the group consisting of: a codebook, a Grid of Beams, GoB, codebook, a New Radio, NR, Type 1 codebook, an NR Type 2 codebook, and a subset of any of these codebooks.

19. The method of any of claims 14 to 18 wherein the transform is chosen from the group consisting of: a Discrete Fourier Transform, DFT, an Inverse DFT, a Discrete Cosine Transform, DCT, and an Inverse DCT.

20. The method of any of claims 14 to 19 wherein the transform is linear.

21. The method of any of claims 14 to 20 wherein the FOM is a maximum.

22. The method of claim 21 wherein the maximum is only performed over a limited range.

23. The method of claim 22 wherein the limited range is related to at least one of the group consisting of: a cyclic prefix and a delay spread of the channel.

24. The method of any of claims 14 to 23 wherein the figure of merit is proportional to an estimated Signal to Noise Ratio, SNR.

25. The method of any of claims 14 to 24 wherein the wireless device operates in a NR communication network.

26. The method of any of claims 14 to 25 wherein the another device is a gNB.

27. A base station (800) for determining precoding information, the base station (800) comprising:

one or more processors (804); and

memory (806) comprising instructions to cause the base station (800) to:

determine channel estimates for at least a channel between the base station and another device;

determine a plurality of precoding hypotheses based on the channel estimates;

determine a Figure of Merit, FOM, for each of the plurality of precoding hypotheses; and

determine the precoding information based on the FOM for each of the plurality of precoding hypotheses.

28. The base station (800) of claim 27 wherein the instructions further cause the base station (800) to perform the method of any one of claims 2 to 13.

29. A wireless device (1100) for determining precoding information, the wireless device (1100) comprising:

one or more processors (1102); and

memory (1104) comprising instructions to cause the wireless device (1100) to: determine channel estimates for at least a channel between the base station and another device;

determine a plurality of precoding hypotheses based on the channel estimates;

determine a Figure of Merit, FOM, for each of the plurality of precoding hypotheses; and

determine the precoding information based on the FOM for each of the plurality of precoding hypotheses.

30. The wireless device (1100) of claim 29 wherein the instructions further cause the wireless device (1100) to perform the method of any one of claims 15 to 26.