Receiver, transmitter, system and method employing space-delay precoding

US11973549B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Venkatesh Ramireddy · Erlangen, DE
• Markus Landmann · Erlangen, DE
• Marcus GROßMANN · Friedrichroda, DE

Key dates

• Filing date: Jan 27, 2021
• Grant date: Apr 30, 2024
• Expiry date: Jul 1, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B7/0639
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A receiver processes a radio signal received via a radio channel from a transmitter employing a plurality of antenna ports, determines complex precoder coefficients and delays of one or more space-delay precoders for one or more transmission layers and antenna ports at the transmitter so as to achieve a predefined property for a communication over the radio channel, and feeds back, explicitly or implicitly, delays and the complex precoder. The space-delay precoder has a dual-stage structure having a spatial codebook matrix including spatial beamforming vectors, a frequency-domain codebook matrix, and a combining element per layer for complex scaling or combining one or more of the vectors selected from the spatial and/or frequency-domain codebook matrices. The frequency-domain codebook matrix is defined by a sub-matrix of a DFT matrix, which the sub-matrix of the DFT matrix is associated with a range of delay values.