Precoding with a codebook for a wireless system
AssigneeNEC Laboratories America, Inc.
InventorMohammad Ali Khojastepour
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Abstract
A method of precoding implemented in a base station used in a wireless communications system having codebooks for multiple transmission ranks is disclosed. The method includes precoding data in one or more layers with a precoding matrix obtained from one of the codebooks, and transmitting the precoded data to a user equipment, wherein entries of said one of the codebooks are accessed through a first description and a second description, wherein the precoding matrix is determined according to the first description and the second description, which are unique to the precoding matrix, and wherein the second description provides a finer description of said one of the codebooks than the first description. Other methods, systems, and apparatuses also are disclosed.
Claims9
A method of precoding implemented in a base station used in a wireless communications system with multiple transmission ranks, the method comprising:
- having a codebook for each transmission rank;
- precoding data with a precoding matrix obtained from the codebook;
- and
- transmitting the precoded data to a user equipment,
- wherein entries of one or more of the codebooks are accessed through a first description and a second description,
- wherein the precoding matrix is determined according to the first description and the second description, which are unique to the precoding matrix, and
- wherein the second description provides a finer description of the codebook than the first description.
A method implemented in a user equipment used in a wireless communications system with multiple transmission ranks, the method comprising:
- receiving, from a base station, data precoded with a precoding matrix,
- wherein the precoding matrix is obtained from a codebook for each transmission rank,
- wherein entries of one or more of the codebooks are accessed through a first description and a second description,
- wherein the precoding matrix is determined according to the first description and the second description, which are unique to the precoding matrix, and
- wherein the second description provides a finer description of the codebook than the first description.
A method implemented in a user equipment used in a wireless communications system with multiple transmission ranks, the method comprising:
- transmitting to a base station an indication for a precoding matrix in order for the base station to precode data,
- wherein the precoding matrix is obtained from a codebook for each transmission rank,
- wherein entries of one or more of the codebooks are accessed through a first description and a second description, both of which are included in the indication,
- wherein the precoding matrix is determined according to the first description and the second description, which are unique to the precoding matrix, and
- wherein the second description provides a finer description of the codebook than the first description.
Dependencies are inferred from the claim text.