MU-MIMO precoder design and use for a wideband mMIMO system with constrained RF chains in a multi-path environment

US11190249B2 · kind B2 · utility

Assignee

• NOKIA SOLUTIONS AND NETWORKS OY · FI

Inventors

• Rakash SIVASIVA GANESAN · Unterhaching, DE
• Wolfgang Zirwas · Munich, DE
• Berthold PANZNER · Holzkirchen, DE

Key dates

• Filing date: Jun 14, 2017
• Grant date: Nov 30, 2021
• Expiry date: Jul 22, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L5/0048
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

For a system with multiple Antenna Elements, AEs, to be used to transmit multiple symbols to multiple user equipments, UEs, and with multiple time sample positions, where the symbols occupy a time-frequency resource space and wherein at least some of the AEs are powered by constrained RF chains having functionalities that are simplified relative to full RF chains, precoder coefficients are generated for the multiple AEs taking into consideration multipath components of a signal to be transmitted from the multiple AEs to the multiple UEs. The generating forms precoder coefficients for individual ones of the constrained RF chains at corresponding certain time sample positions of the symbols. The signal is transmitted from the multiple AEs to the multiple UEs using FDMA at least by applying the generated precoder coefficients to the multiple AEs over the multiple time sample positions and time-frequency resource space of the symbols.