ALEXANDRIA, Va., Oct. 21 -- United States Patent no. RE51,089, issued on Oct. 20, was assigned to Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V. (Munich).

"CSI reporting and codebook structure for doppler-delay codebook-based precoding in a wireless communications system" was invented by Venkatesh Ramireddy (Erlangen, Germany), Marcus GroBmann (Erlangen, Germany) and Markus Landmann (Erlangen, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive a radio signal including downlink reference signals. The processor estimates an explicit CSI, ...