US 12,451,937 B2
Data based precoding techniques
Yi Huang, San Diego, CA (US); Hwan Joon Kwon, San Diego, CA (US); Krishna Kiran Mukkavilli, San Diego, CA (US); and Tingfang Ji, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Apr. 1, 2021, as Appl. No. 17/220,251.
Prior Publication US 2022/0321180 A1, Oct. 6, 2022
Int. Cl. H04B 7/0456 (2017.01); H04B 7/06 (2006.01); H04L 5/00 (2006.01); H04L 25/02 (2006.01)
CPC H04B 7/0456 (2013.01) [H04B 7/0626 (2013.01); H04L 5/0051 (2013.01); H04L 25/0242 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An apparatus for wireless communication at a wireless device, comprising:
at least one memory; and
at least one processor coupled to the at least one memory and configured to:
calculate, for each of multiple frequency tones, a data correlation across a plurality of multiple input multiple output (MIMO) layers;
average the data correlation over the multiple frequency tones to generate a data correlation matrix;
determine, based on the data correlation matrix, a nulling matrix or a rotation matrix that varies based on content of data that is to be transmitted;
apply precoding to payload data to obtain a precoded data transmission, wherein the precoding includes a first portion that is a first function of a channel measurement and a second portion that is a second function of the content of the data, wherein the data is associated with the payload data, and wherein the second portion is based on the nulling matrix or the rotation matrix;
transmit a reference signal associated with the precoded data transmission, wherein the reference signal is precoded based on the channel measurement and not the second portion of the precoding;
transmit information about the second portion of the precoding that is the second function of the content of the data and to be applied to the precoded data transmission; and
transmit the precoded data transmission.