Method and system for managing precoding in a multi-user wireless communications system
View Patent ↗Operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating a channel estimation, predicting a future channel estimation from the channel estimation, precoding data in response to the predicted future channel estimation, and transmitting the precoded data.
1. A method for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations, the method comprising:
generating a channel estimation;
predicting a future channel estimation from the channel estimation;
precoding data in response to the predicted future channel estimation; and
transmitting the precoded data, wherein precoding the data in response to the predicted future channel estimation includes identifying a precoding scheme in response to the predicted future channel estimation.
2. The method of claim 1 wherein identifying the precoding scheme includes selecting a precoding matrix in response to the predicted future channel estimation.
3. The method of claim 2 wherein selecting the precoding matrix includes selecting a codebook index in response to the predicted future channel estimation.
4. A method for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations, the method comprising:
generating a channel estimation;
predicting a future channel estimation from the channel estimation;
precoding data in response to the predicted future channel estimation; and
transmitting the precoded data, wherein precoding the data in response to the predicted future channel estimation includes performing a singular value decomposition (SVD) on the predicted future channel estimation and precoding the data in response to the SVD.
5. The method of claim 4 further comprising generating a precoding matrix in response to the SVD.
6. A method for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations, the method comprising:
receiving symbols related to a channel;
generating channel response information from the received symbols;
predicting future channel response information in response to the channel response information;
precoding data in response to the predicted future channel response information; and
transmitting the precoded data, wherein precoding the data in response to the predicted future channel response information includes identifying a precoding scheme in response to the predicted future channel response information and precoding the data in response to the identified precoding scheme.
7. The method of claim 6 wherein identifying the precoding scheme includes selecting a precoding matrix in response to the predicted future channel response information.
8. The method of claim 7 wherein selecting the precoding matrix includes selecting a codebook index in response to the predicted future channel response information.
9. A base station that supports multi-user multiple-input multiple-output (MU-MIMO) communications between the base station and multiple mobile stations, the base station comprising:
a channel estimator configured to generate a channel estimation from received symbols;
a channel estimation predictor configured to predict a future channel estimation from the channel estimation;
a precoder configured to precode data in response to the predicted future channel estimation;
a transmitter configured to transmit the precoded data; and
a singular value decomposition (SVD) module configured to generate a precoding matrix in response to the predicted future channel estimation;
wherein the precoder is configured to precode data in response to the precoding matrix from the SVD module.
10. A mobile station that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and the mobile station, the mobile station comprising:
a channel estimator configured and arranged to generate a channel estimation from received symbols;
a channel estimation predictor configured and arranged to predict a future channel estimation from the channel estimation;
a precoding scheme selector configured and arranged to select a precoding scheme in response to the predicted future channel estimation; and
a transmitter configured and arranged to transmit an indication of the precoding scheme to the base station,
wherein the precoding scheme selector is further configured to select a precoding matrix in response to the predicted future channel estimation, and
the precoding scheme selector is further configured to select a codebook index that identifies the selected precoding matrix.