IP Library › Granted Patent US 12706779
Granted Patent B2
US 12706779 · App. 19/016,644 · Granted Aug 11, 2026

Multi-reference aligned channel estimation

Inventors: Gabriele Cesa (Diemen, NL); Kumar Pratik (Amsterdam, NL); Arash Behboodi (Amsterdam, NL); Yuanning Yu (Santa Clara, CA); Jae Won Yoo (San Diego, CA); Manish Jain (San Jose, CA); Hari Sankar (San Diego, CA); Supratik Bhattacharjee (San Diego, CA); Joseph Binamira Soriaga (San Diego, CA)
Assignee: Qualcomm Incorporated
H04L25/0204H04B7/0456
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Quick Facts
Patent No.
US 12706779
App. No.
19/016,644
Granted
Aug 11, 2026
Kind
B2
Abstract

Certain aspects of the present disclosure provide techniques for wireless communications. An example method includes receiving a first transmission comprising a first reference signal and a second transmission comprising a second reference signal, wherein at least one of: the first transmission comprises a first physical resource block group (PRG) and the second transmission comprises a second PRG, or the first transmission is in a first time resource and the second transmission is in a second time resource; estimating, using the first reference signal and the second reference signal, a precoding misalignment between the first transmission and the second transmission; and estimating, based on the precoding misalignment, a first channel for the first transmission and a second channel for the second transmission.

Claims (39)

1 . An apparatus for wireless communications, comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause a wireless communications device to:

receive a first transmission comprising a first reference signal and a second transmission comprising a second reference signal, wherein at least one of:

the first transmission comprises a first physical resource block group (PRG) and the second transmission comprises a second PRG, or

the first transmission is in a first time resource and the second transmission is in a second time resource;

estimate, using the first reference signal and the second reference signal, a precoding misalignment between the first transmission and the second transmission; and

estimate, based on the precoding misalignment, a first channel for the first transmission and a second channel for the second transmission.

2 . The apparatus of claim 1 , wherein the first transmission overlaps the second transmission in time.

3 . The apparatus of claim 1 , wherein the precoding misalignment indicates a difference between a first precoder of the first transmission and a second precoder of the second transmission, wherein the second precoder is different than the first precoder.

4 . The apparatus of claim 3 , wherein the second precoder is unknown to the wireless communications device.

5 . The apparatus of claim 4 , wherein the first precoder is also unknown to the wireless communications device.

6 . The apparatus of claim 1 , wherein to cause the wireless communications device to estimate the precoding misalignment, the processing system is configured to cause the wireless communications device to estimate the precoding misalignment based on maximizing a joint probability of observations of aligned reference signals given a first channel estimation derived from the first reference signal and a second channel estimation derived from the second reference signal.

7 . The apparatus of claim 1 , wherein to cause the wireless communications device to estimate the first channel and the second channel, the processing system is configured to cause the wireless communications device to:

estimate the first channel using a first channel estimation derived from the first reference signal; and

estimate the second channel using the precoding misalignment and a second channel estimation derived from the second reference signal.

8 . The apparatus of claim 7 , wherein to cause the wireless communications device to estimate the second channel, the processing system is configured to cause the wireless communications device to correct the second channel estimation to remove the precoding misalignment.

9 . The apparatus of claim 1 , wherein the first transmission comprises a first plurality of reference signals, the second transmission comprises a second plurality of reference signals, and estimating the first channel and the second channel is based on a first proper subset of the first plurality of reference signals and a second proper subset of the second plurality of reference signals.

10 . The apparatus of claim 1 , wherein the estimation of the precoding misalignment is based on a first channel estimation within a transmission of the first transmission or the second transmission, and based on a second channel estimation of the second transmission using the first reference signal.

11 . The apparatus of claim 1 , wherein the precoding misalignment is a first precoding misalignment and the processing system is configured to cause the wireless communications device to:

estimate a second precoding misalignment between the second transmission and a third transmission; and

estimate a third channel for the third transmission based on the second precoding misalignment.

12 . The apparatus of claim 11 , wherein the estimation of the second channel is further based on the second precoding misalignment.

13 . The apparatus of claim 1 , wherein the precoding misalignment is based on a first initial channel estimation of the first transmission and a second initial channel estimation of the second transmission.

14 . The apparatus of claim 13 , wherein to cause the wireless communications device to estimate the precoding misalignment, the processing system is configured to cause the wireless communications device to iteratively estimate the precoding misalignment.

15 . A method for wireless communications by a wireless communications device, comprising:

receiving a first transmission comprising a first reference signal and a second transmission comprising a second reference signal, wherein at least one of:

the first transmission comprises a first physical resource block group (PRG) and the second transmission comprises a second PRG, or

the first transmission is in a first time resource and the second transmission is in a second time resource;

estimating, using the first reference signal and the second reference signal, a precoding misalignment between the first transmission and the second transmission; and

estimating, based on the precoding misalignment, a first channel for the first transmission and a second channel for the second transmission.

16 . The method of claim 15 , wherein the first transmission overlaps the second transmission in time.

17 . The method of claim 15 , wherein the precoding misalignment indicates a difference between a first precoder of the first transmission and a second precoder of the second transmission, wherein the second precoder is different than the first precoder.

18 . The method of claim 17 , wherein the second precoder is unknown to the wireless communications device.

19 . The method of claim 18 , wherein the first precoder is also unknown to the wireless communications device.

20 . An apparatus for wireless communications comprising:

means for receiving a first transmission comprising a first reference signal and a second transmission comprising a second reference signal, wherein at least one of:

the first transmission comprises a first physical resource block group (PRG) and the second transmission comprises a second PRG, or

the first transmission is in a first time resource and the second transmission is in a second time resource;

means for estimating, using the first reference signal and the second reference signal, a precoding misalignment between the first transmission and the second transmission; and

means for estimating, based on the precoding misalignment, a first channel for the first transmission and a second channel for the second transmission.