Method for measuring downlink channel quality, transmit end, receive end, and system

A base station, comprising:

• a transmitter, configured to transmit at least two mixed pilot signals to a user terminal separately by using at least two physical antennas in the wireless transceiver apparatus, wherein the at least two physical antennas correspond to at least two logical antennas, and the at least two mixed pilot signals are separately obtained after preset pilot signals corresponding to logical antennas in the at least two logical antennas are weighted by using a precodinq weight matrix;
• and to send a first codebook subset restriction instruction to the user terminal, wherein the first codebook subset restriction instruction carries a rank indication RANK and at least one precodinq matrix index (PMI), wherein the mixed pilot signals, the first codebook subset restriction instruction, and the preset pilot signals are used for acquisition of downlink channel quality of an equivalent channel of a specified antenna;
• and
• a receiver, configured to receive a channel quality feedback message from the user terminal which is associated with the downlink channel quality of the equivalent channel of the specified antenna, wherein the RANK and the PMI point to a first restriction codebook matrix, and the first restriction codebook matrix is used for acquiring downlink channel quality of equivalent channels of at least two auxiliary beam antennas of the base station after spatial multiplexing;
• the channel quality feedback message comprises downlink channel quality indicators (CQIs) of the equivalent channels of the at least two auxiliary beam antennas;
• and
• the base station further comprises a processor configured to determine, according to the downlink CQIs of the equivalent channels of the at least two auxiliary beam antennas, whether to use an auxiliary beam antenna in the at least two auxiliary beam antennas to serve the user terminal.

A non-transitory computer-readable storage medium, wherein the computer-readable storage medium stores a program, and the program, when being executed, causes a base station to perform a method comprising:

• transmitting at least two mixed pilot signals to a user terminal separately by using at least two physical antennas, wherein the at least two physical antennas correspond to at least two logical antennas, and the at least two mixed pilot signals are separately obtained after preset pilot signals corresponding to logical antennas in the at least two logical antennas are weighted by using a precoding weight matrix;
• sending a first codebook subset restriction instruction to the user terminal, wherein the first codebook subset restriction instruction carries a rank indication RANK and at least one precoding matrix index (PMI), wherein the mixed pilot signals, the first codebook subset restriction instruction, and the preset pilot signals are used for acquisition of downlink channel quality of an equivalent channel of a specified antenna;
• and
• receiving a channel quality feedback message from the user terminal which is associated with the downlink channel quality of the equivalent channel of the specified antenna, wherein the RANK and the PMI point to a first restriction codebook matrix, and the first restriction codebook matrix is used for acquiring downlink channel quality of equivalent channels of at least two auxiliary beam antennas of the base staion after spatial multiplexing;
• the channel quality feedback messaqe comprises downlink channel quality indicators (CQIs) of the equivalent channels of the at least two auxiliary beam antennas;
• and
• after receiving the channel quality feedback message, the method further comprises:
• determining, by the base station according to the downlink CQIs of the equivalent channels of the at least two auxiliary beam antennas, whether to use an auxiliary beam antenna in the at least two auxiliary beam antennas to serve the user terminal.