Precoding information collection method and transmission device

A method of precoding information collection, applied to a receive apparatus, wherein there are M data streams used for data transmission between the receive apparatus and a transmit apparatus, and M is an integer greater than 1, the method comprising:

• receiving, by the receive apparatus, a precoded first pilot signal group sent by the transmit apparatus, and receiving i precoded second pilot signal groups sent by the transmit apparatus, wherein i is an integer greater than or equal to 1;
• demodulating, by the receive apparatus, the precoded first pilot signal group to obtain a first pilot signal group, and demodulating the i precoded second pilot signal groups to obtain i second pilot signal groups respectively;
• and
• sending, by the receive apparatus, precoding feedback information to the transmit apparatus according to the first pilot signal group and the i second pilot signal groups, wherein the first pilot signal group comprises M first pilot signals, and the ith second pilot signal group comprises Ai second pilot signals;
• and
• the sending, by the receive apparatus, precoding feedback information to the transmit apparatus according to the first pilot signal group and the i second pilot signal groups comprises:
• obtaining, by the receive apparatus, signal quality of the M first pilot signals in the first pilot signal group, and obtaining signal quality of
• ∑
• i
• ⁢
• A
• i
• second pilot signals in the i second pilot signal groups;
• and
• selecting, by the receive apparatus, B pilot signals according to signal quality of all of the first pilot signals and signal quality of all of the second pilot signals, and sending the precoding feedback information to the transmit apparatus according to the B pilot signals, wherein B is an integer that is greater than or equal to 1 and less than or equal to
• ∑
• i
• ⁢
• A
• i
• +
• M
• .