Precoding with a codebook for a wireless system
View Patent ↗A method of precoding implemented in a base station used in a wireless communications system with multiple transmission ranks is disclosed. The method includes having a codebook for a transmission rank, precoding data in one or more layers with a precoding matrix selected from the codebook, and transmitting the precoded data to a user equipment, wherein the precoding matrix is selected according to a first description and a 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. Other methods, systems, and apparatuses also are disclosed.
1. 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 a transmission rank;
precoding data with a precoding matrix selected from the codebook; and
transmitting the precoded data to a user equipment,
wherein the precoding matrix is selected according to a first description and a 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.
2. The method as in claim 1 , wherein the codebook comprises a vector codebook.
3. The method as in claim 1 , wherein the determination comprises calculation.
4. A method implemented in a user equipment used in a wireless communications system with multiple transmission ranks, the method comprising:
having a codebook for a transmission rank; and
receiving, from a base station, data precoded with a precoding matrix,
wherein the precoding matrix is selected from a codebook for a transmission rank,
wherein the precoding matrix is selected according to a first description and a 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.
5. The method as in claim 4 , wherein the codebook comprises a vector codebook.
6. The method as in claim 4 , wherein the determination comprises calculation.
7. A method implemented in a user equipment used in a wireless communications system with multiple transmission ranks, the method comprising:
having a codebook for a transmission rank; and
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 selected from a codebook for a transmission rank,
wherein the precoding matrix is selected according to a first description and a 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.
8. The method as in claim 7 , wherein the codebook comprises a vector codebook.
9. The method as in claim 7 , wherein the determination comprises calculation.