Patent ID: 11943158
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A data communication apparatus, for transmitting one or more blocks of data within a frame comprising a two-dimensional grid of transmission symbol positions,
wherein the data communication apparatus is configured to select a group of transmission symbol positions, which is a subset of the two-dimensional grid of transmission symbol positions, for a transmission of a data portion,
wherein one or more reference symbol positions are associated to the selected group of transmission symbol positions;
wherein the data communication apparatus is configured to determine which one or more symbol positions are used as one or more reference symbol positions based on the selection of the group of transmission symbol positions or together with the selection of the group of transmission symbol positions; and
wherein the reference symbol positions are variable with respect to one or more borders of time slots of the frame or with respect to one or more borders of sub-frames of the frame, and/or
wherein the one or more reference symbol positions are variable with respect to the selected group of transmission symbol positions;
wherein the location of the reference symbol positions with respect to one or more borders of time slots of the frame or with respect to one or more borders of sub-frames of the frame vary in dependence on an actual selection of a group of transmission symbol positions;
wherein the data communication apparatus is configured to choose a number of reference symbol positions associated with the selected group of transmission symbol positions in dependence on a location of the selected group of transmission symbol positions within a sub-frame;
wherein the data communication apparatus is configured to choose a number of reference symbol positions associated with the selected group of transmission symbol positions,
wherein only one reference symbol position is associated with selectable groups of transmission symbol positions neighboring a temporal border of the sub-frame, and
wherein two or more reference symbol positions are associated with at least one selectable group of transmission symbol positions which is distant from both temporal borders of the sub-frame.