| 摘要 |
Disclosed are a channel state information acquisition method, and a channel state information feedback method and apparatus. The method comprises: a terminal performs, according to a received pilot signal, channel estimation to obtain a channel estimation value of A antenna ports, wherein the A antenna ports are A antenna ports sending the pilot signal by a network device; the terminal determines, according to the channel estimation value of the A antenna ports, Q antenna ports, wherein L≤Q≤A, L is a value of rank indication (RI) adopted when the network device sends downlink data to the terminal, or L is a value of channel rank indication (RI) determined by the terminal; and the terminal determines, according to the Q antenna ports, first order pre-coding matrix indication information and feeds back channel state information (CSI) containing the first order pre-coding matrix indication information to the network device, wherein the first order pre-coding matrix indication information is used for indicating an index of the Q antenna ports in the A antenna ports sending the pilot signal. |
