DL MIMO Precoding Enhancement

摘要

A method includes applying a precoder to information to be transmitted on N antenna ports, wherein application of the precoder creates an M-Tx codebook, each codeword of which is obtained through truncation of a codeword from an N-Tx codebook corresponding to the N antenna ports. The precoded information is transmitted on the N antenna ports to a UE and information allowing an N-Tx codeword to be selected from the N-Tx codebook is received. The N-Tx codeword is truncated to an M-Tx codeword and the M-Tx codeword is used for a transmission to the UE. Another method includes receiving at a UE a transmission in first and second sets of N antenna ports, wherein the second set of antenna ports creates at least in part an M-Tx codebook. The UE searches the N-Tx codebook to determine an N-Tx codeword to be fed back and feeds back the N-Tx codeword.

主权项

1. A method, comprising:
applying a precoder to information to be transmitted on N antenna ports, wherein application of the precoder to the information creates at least in part an M-Tx codebook, each codeword of which is obtained through truncation of a codeword from an N-Tx codebook corresponding to the N antenna ports; transmitting the precoded information on the N antenna ports; receiving, responsive to the transmission and from the user equipment, information allowing an N-Tx codeword to be selected from the N-Tx codebook; truncating, based at least on the precoder, the N-Tx codeword to an M-Tx codeword; and using the M-Tx codeword for a transmission of information to the user equipment.