System and method for quantization of angles for beamforming feedback

• US 10,141,989 B2
• Filed: 02/02/2018
• Issued: 11/27/2018
• Est. Priority Date: 12/16/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Suh, Jung Hoon, Zhu, Jun, Aboul-Magd, Osama
• Primary Examiner(s): Perez, James M
• Application Number:
  US15/887,436
• Publication Number:
  US 20180167113A1
• Time in Patent Office: 298 Days
• Field of Search: 375259-352
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

An embodiment method for beamforming feedback includes receiving a sounding packet for a beamforming transmission, performing planar rotation in accordance with the sounding packet to generate phi and psi angle values, quantizing the phi and psi angle values to a same bit resolution, and feeding back the quantized phi and psi angle values.

Claims

1. A method for beamforming feedback comprising:

receiving a sounding packet for a beamforming transmission;

performing planar rotation in accordance with the sounding packet to generate phi and psi angle values;

quantizing the phi and psi angle values such that a quantized resolution of the phi angle value is different from a quantized resolution of the psi angle value; and

feeding back the quantized phi and psi angle values.

2. The method of claim 1, wherein the planar rotation is a Givens rotation.

3. The method of claim 1, wherein quantizing the phi and psi angle values comprises using a first number of bits for quantizing phi that has been set to be equal to a second number of bits for quantizing psi.

4. The method of claim 1, further comprising, in a case of single user feedback, setting a Codebook Information subfield of a very high throughput (VHT) multiple-input multiple-output (MIMO) Control field specified in an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard to 0 to indicate that a first number of bits are used for both phi and psi, and setting the Codebook Information subfield to 1 to indicate that a second number of bits are used for both phi and psi.

5. The method of claim 4, further comprising, in a case of multiple user feedback, setting the Codebook Information subfield to 0 to indicate that a third number of bits are used for both phi and psi, and setting the Codebook Information subfield to 1 to indicate that a fourth number of bits are used for both phi and psi.

6. The method of claim 1, wherein the sounding packet is a null data packet announcement (NDPA) received from a beamformer, wherein the NDPA includes a subfield added to a Per User Info field, wherein, when the subfield is set to a first value, a first number of bits are used for both phi and psi in a case of single user (SU)-MIMO and a second number of bits are used for both phi and psi in a case of multiple user (MU)-MIMO, and wherein, when the subfield is set to a second value, a third number of bits are used for both phi and psi in the case of SU-MIMO and a fourth number of bits are used for both phi and psi in the case of MU-MIMO.

7. A station comprising:

a non-transitory memory storage comprising instructions; and

one or more processors in communication with the memory, wherein the one or more processors execute the instructions for;

receiving a sounding packet for a beamforming transmission;

performing planar rotation in accordance with the sounding packet to generate phi and psi angle values;

quantizing the phi and psi angle values such that a quantized resolution of the phi angle value is different from a quantized resolution of the psi angle value; and

feeding back the quantized phi and psi angle values.

8. The station of claim 7, wherein the planar rotation is a Givens rotation.

9. The station of claim 7, wherein quantizing the phi and psi angle values comprises using a first number of bits for quantizing phi that has been set to be equal to a second number of bits for quantizing psi.

10. The station of claim 7, further comprising the one or more processors executing the instructions for, in a case of single user feedback, setting a Codebook Information subfield of a very high throughput (VHT) multiple-input multiple-output (MIMO) Control field specified in an institute of Electrical and Electronics Engineers (IEEE) 802.11 standard to 0 to indicate that a first number of bits are used for both phi and psi, and setting the Codebook Information subfield to 1 to indicate that a second number of bits are used for both phi and psi.

11. The station of claim 10, further comprising the one or more processors executing the instructions for, in a case of multiple user feedback, setting the Codebook Information subfield to 0 to indicate that a third number of bits are used for both phi and psi, and setting the Codebook Information subfield to 1 to indicate that a fourth number of bits are used for both phi and psi.

12. The station of claim 7, wherein the sounding packet is a null data packet announcement (NDPA) received from a beamformer, wherein the NDPA includes a subfield added to a Per User Info field, wherein, when the subfield is set to a first value, the one or more processors execute the instructions to use a first number of bits for both phi and psi in a case of single user (SU)-MIMO and use a second number of bits for both phi and psi in a case of multiple user (MU)-MIMO, and wherein, when the subfield is set to a second value, the one or more processors execute the instructions to use a third number of bits for both phi and psi in the case of SU-MIMO and use a fourth number of bits for both phi and psi in the case of MU-MIMO.

13. A method for beamforming feedback comprising:

transmitting a sounding packet for a beamforming transmission;

receiving feedback including quantized phi and psi angle values, the quantized phi angle value being different from the quantized psi angle value;

beamforming transmit channels in accordance with the quantized phi and psi angle values; and

transmitting the beamformed transmit channels.

14. The method of claim 13, wherein the phi and psi angle values have been quantized in accordance with a Givens rotation.

15. The method of claim 13, wherein a first number of bits for quantizing phi has been set to be equal to a second number of bits for quantizing psi.

16. The method of claim 13, further comprising, in a case of single user feedback, processing a value of 0 in a Codebook Information subfield of a very high throughput (VHT) multiple-input multiple-output (MIMO) Control field specified in an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard as an indication that a first number of bits are used for both phi and psi, and processing a value of 1 in the Codebook Information subfield as an indication that a second number of bits are used for both phi and psi.

17. The method of claim 16, further comprising, in a case of multiple user feedback, processing a value of 0 in the Codebook Information subfield as an indication that a third number of bits are used for both phi and psi, and processing a value of 1 in the Codebook Information subfield as an indication that a fourth number of bits are used for both phi and psi.

18. The method of claim 13, wherein the sounding packet is a null data packet announcement (NDPA), wherein the NDPA includes a subfield added to a Per User Info field, wherein, when a first number of bits are to be used for both phi and psi in a case of single user (SU)-MIMO and a second number of bits are to be used for both phi and psi in a case of multiple user (MU)-MIMO, the subfield is set to a first value, and wherein, when a third number of bits are to be used for both phi and psi in the case of SU-MIMO and a fourth number of bits are to be used for both phi and psi in the case of MU-MIMO, the subfield is set to a second value.

19. An access point comprising:

a non-transitory memory storage comprising instructions; and

one or more processors in communication with the memory, wherein the one or more processors execute the instructions for;

transmitting a sounding packet for a beamforming transmission;

receiving feedback including quantized phi and psi angle values, the quantized phi angle value being different from the quantized psi angle value;

beamforming transmit channels in accordance with the quantized phi and psi angle values; and

transmitting the beamformed transmit channels.

20. The access point of claim 19, wherein the phi and psi angle values have been quantized in accordance with a Givens rotation.

21. The access point of claim 19, wherein a first number of bits for quantizing phi has been set to be equal to a second number of bits for quantizing psi.

22. The access point of claim 19, further comprising the one or more processors executing the instructions for, in a case of single user feedback, processing a value of 0 in a Codebook Information subfield of a very high throughput (VHT) multiple-input multiple-output (MIMO) Control field specified in an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard as an indication that a first number of bits are used for both phi and psi, and processing a value of 1 in the Codebook Information subfield as an indication that a second number of bits are used for both phi and psi.

23. The access point of claim 22, further comprising the one or more processors executing the instructions for, in a case of multiple user feedback, processing a value of 0 in the Codebook Information subfield as an indication that a third number of bits are used for both phi and psi, and processing a value of 1 in the Codebook Information subfield as an indication that a fourth number of bits are used for both phi and psi.

24. The access point of claim 19, wherein the sounding packet is a null data packet announcement (NDPA), wherein the NDPA includes a subfield added to a Per User Info field, wherein, when a first number of bits are to be used for both phi and psi in a case of single user (SU)-MIMO and a second number of bits are to be used for both phi and psi in a case of multiple user (MU)-MIMO, the one or more processors execute the instructions to set the subfield to a first value, and wherein, when a third number of bits are to be used for both phi and psi in the case of SU-MIMO and a fourth number of bits are to be used for both phi and psi in the case of MU-MIMO, the one or more processors execute the instructions to set the subfield to a second value.