Doppler-delay codebook-based precoding and CSI reporting wireless communications systems

US11616551B2 · kind B2 · utility

Assignee

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

Inventors

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

Key dates

• Filing date: Nov 16, 2020
• Grant date: Mar 28, 2023
• Expiry date: May 6, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W76/27
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the RI.