CODEBOOK RESTRICTION

摘要

Systems and methods for codebook restriction for closed-loop codebook-based precoding in a Multiple-Input-Multiple-Output (MIMO) wireless communications system based on antenna correlation are disclosed. In some embodiments, a method of operation of a wireless device to provide feedback for a closed-loop codebook-based precoding system is provided. The method comprises determining a codebook restriction based on an antenna correlation for a MIMO channel between a network node and the wireless device. The antenna correlation is transmit antenna correlation, receive antenna correlation, or both transmit and receive antenna correlation. The codebook restriction is a restriction that reduces a full codebook of the wireless device to a reduced codebook. The method of operation of the wireless device further comprises generating a feedback report using the reduced codebook and transmitting the feedback report to the network node. By generating the feedback report using the reduced codebook, complexity is substantially reduced.

主权项

1. A method of operation of a wireless device to provide feedback for a closed-loop codebook-based precoding system, comprising:
determining a codebook restriction for the closed-loop codebook-based precoding system based on an antenna correlation for a Multiple-Input-Multiple-Output, MIMO, channel between a network node and the wireless device, the antenna correlation being at least one of transmit antenna correlation and receive antenna correlation and the codebook restriction being a restriction that reduces a full codebook for the closed-loop codebook-based precoding system of the wireless device to a reduced codebook; generating a feedback report using the reduced codebook for the closed-loop codebook-based precoding system; and transmitting the feedback report to the network node.