Precoding information obtaining method, and device

US10516516B2 · kind B2 · utility

Assignees

• Huawei Technologies Co., Ltd. · CN
• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Lei Wang · Hangzhou City, CN
• Martin Kurras · Berlin, DE
• Lars THIELE · Berlin, DE
• Thomas Haustein · Potsdam, DE
• Dageng Chen · Shanghai, CN
• Ye Wu · Shanghai, CN
• Deli Qiao · Nanhu, CN

Key dates

• Filing date: Jul 20, 2017
• Grant date: Dec 24, 2019
• Expiry date: Feb 14, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L5/0051
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Embodiments of the present invention provide a precoding information obtaining method and a device. The method includes: separately precoding, by a network device by using N sub-codebooks, a pilot group including K pilots to obtain N precoded pilot groups, where the sub-codebooks are subsets of a precoding codebook, the precoding codebook includes M precoding vectors, each sub-codebook includes K precoding vectors; sending, by the network device, a precoded pilot group to a terminal device in each of W RB groups; and receiving, by the network device, precoding information fed back by the terminal device for any one of W precoded pilot groups. According to the precoding information obtaining method and the device, a quantity of pilot signals sent by the network device in each RB group is reduced, and pilot overheads in each RB group are reduced.