Precoding information collection method and transmission device

A precoding information collection method, comprising:

• receiving, by a receive side, a precoded first pilot signal sent by a transmit side, and receiving N precoded second pilot signals sent by the transmit side, wherein N is an integer greater than or equal to 1;
• demodulating, by the receive side, the precoded first pilot signal to obtain a first pilot signal, and demodulating the N precoded second pilot signals to obtain N second pilot signals respectively;
• and
• sending, by the receive side, precoding feedback information to the transmit side according to the first pilot signal and the N second pilot signals.

A precoding information collection method, applied to a transmit side, wherein there are M data streams used for data transmission between the transmit side and at least one receive side, and M is an integer greater than 1;

• and the method comprises:
• precoding, by the transmit side, a first pilot signal group according to a first precoding matrix, and sending a precoded first pilot signal group to the receive side, wherein the first precoding matrix comprises M first precoding vectors that are different from each other, the first pilot signal group comprises M first pilot signals, and the first precoding matrix is the same as a precoding matrix used for current data transmission;
• precoding, by the transmit side, i second pilot signal groups according to i second precoding matrices respectively, and sending i precoded second pilot signal groups to the receive side, wherein the ith second precoding matrix comprises Ai second precoding vectors that are different from each other, the ith second pilot signal group comprises Ai second pilot signals, i is an integer greater than or equal to 1, Ai is an integer greater than or equal to 1, the second precoding matrices used for precoding the second pilot signal groups are different from each other, and the i second precoding matrices are different from the first precoding matrix;
• and
• receiving, by the transmit side, precoding feedback information sent by the receive side.

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

• and the method comprises:
• receiving, by the receive side, a precoded first pilot signal group sent by the transmit side, and receiving i precoded second pilot signal groups sent by the transmit side, wherein i is an integer greater than or equal to 1;
• demodulating, by the receive side, 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 side, precoding feedback information to the transmit side according to the first pilot signal group and the i second pilot signal groups.

A transmit side, wherein the transmit side comprises a processor, a transmitter, and a receiver;

• the processor is configured to precode a first pilot signal according to a first precoding matrix, wherein the first precoding matrix is the same as a precoding matrix used for current data transmission;
• the transmitter is configured to send, to a receive side, a precoded first pilot signal obtained by the processor;
• the processor is further configured to precode N second pilot signals according to N second precoding matrices, wherein N is an integer greater than or equal to 1, the second precoding matrices used for precoding the second pilot signals are different from each other, and the N second precoding matrices are different from the first precoding matrix;
• the transmitter is further configured to send, to the receive side, N precoded second pilot signals obtained by the processor;
• and
• the receiver is configured to receive precoding feedback information sent by the receive side.

A receive side, wherein the receive side comprises a receiver, a processor, and a transmitter;

• the receiver is configured to receive a precoded first pilot signal sent by a transmit side, and receive N precoded second pilot signals sent by the transmit side, wherein N is an integer greater than or equal to 1;
• the processor is configured to demodulate the precoded first pilot signal received by the receiver to obtain a first pilot signal, and demodulate the N precoded second pilot signals received by the receiver to obtain N second pilot signals respectively;
• and
• the transmitter is configured to send precoding feedback information to the transmit side according to the first pilot signal and the N second pilot signals that are obtained by the processor.

A transmit side, wherein there are M data streams used for data transmission between the transmit side and at least one receive side, and M is an integer greater than 1;

• and the transmit side comprises a processor, a transmitter, and a receiver;
• the processor is configured to precode a first pilot signal group according to a first precoding matrix, wherein the first precoding matrix comprises M first precoding vectors that are different from each other, the first pilot signal group comprises M first pilot signals, and the first precoding matrix is the same as a precoding matrix used for current data transmission;
• the transmitter is configured to send, to the receive side, a precoded first pilot signal group obtained by the processor;
• the processor is further configured to precode i second pilot signal groups according to i second precoding matrices respectively, wherein the ith second precoding matrix comprises Ai second precoding vectors that are different from each other, the ith second pilot signal group comprises Ai second pilot signals, i is an integer greater than or equal to 1, Ai is an integer greater than or equal to 1, the second precoding matrices used for precoding the second pilot signal groups are different from each other, and the i second precoding matrices are different from the first precoding matrix;
• the transmitter is further configured to send, to the receive side, i precoded second pilot signal groups obtained by the processor;
• and
• the receiver is configured to receive precoding feedback information sent by the receive side.

A receive side, wherein there are M data streams used for data transmission between the receive side and a transmit side, and M is an integer greater than 1;

• and the receive side comprises a receiver, a processor, and a transmitter;
• the receiver is configured to receive a precoded first pilot signal group sent by the transmit side, and receive i precoded second pilot signal groups sent by the transmit side, wherein i is an integer greater than or equal to 1;
• the processor is configured to demodulate the precoded first pilot signal group received by the receiver to obtain a first pilot signal group, and demodulate the i precoded second pilot signal groups received by the receiver to obtain i second pilot signal groups respectively;
• and
• the transmitter is configured to send precoding feedback information to the transmit side according to the first pilot signal group and the i second pilot signal groups that are obtained by the processor.