Precoding techniques for wireless communications

US11611379B2 · kind B2 · utility

Assignee

• QUALCOMM Incorporated · US

Inventors

• Saeid Sahraei · San Diego, US
• Gokul Sridharan · Sunnyvale, US
• Shimman Arvind Patel · San Diego, US
• Krishna Kiran Mukkavilli · San Diego, US
• June Namgoong · San Diego, US
• Taesang Yoo · Riverside, US
• Renqiu Wang · San Diego, US

Key dates

• Filing date: Apr 30, 2021
• Grant date: Mar 21, 2023
• Expiry date: Apr 30, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02D30/70
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Methods, systems, and devices for wireless communications are described in which a base station may identify a null space matrix that lies within a null space of an effective channel matrix for communications between the base station and a user equipment (UE). An indication of the null space matrix may be provided to the UE, and the null space matrix used to determine modifications to a precoding matrix. The base station and UE may determine a redistribution matrix that provides a reduced variance of transmission powers for a number of transmission channels, where a product of the null space matrix and the redistribution matrix may be computed and added to the precoding matrix to generate a modified precoding matrix. The modified precoding matrix may be used to generate the communications from the base station and UE with reduced power variance across channels.