Multi-user MIMO systems and methods

A user terminal comprising:

• a transmitter configured to transmit a composite metric specifying a channel quality indicator (CQI) of a multiple-input multiple-output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) channel and a MIMO-OFDM mode indication to a base station, wherein the transmitter is further configured to transmit an indication of a MIMO-OFDM capability, the MIMO-OFDM capability indicating a number of antennas on the user terminal from which the composite metric is transmitted;
• and
• a receiver configured to receive data transmitted from the base station to the user terminal, a modulation and coding of the data being based on the composite metric, wherein the composite metric comprises at least a first bit specifying the CQI.

A base station comprising:

• a receiver configured to receive a composite metric specifying a channel quality indicator (CQI) of a multiple-input multiple-output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) channel and a MIMO-OFDM mode indication, wherein the receiver is further configured to receive an indication of a MIMO-OFDM capability, the MIMO-OFDM capability indicating a number of antennas on a user terminal from which the composite metric is received by the base station;
• and
• a transmitter configured to transmit data to the user terminal, a modulation and coding of the data being based on the composite metric, wherein the composite metric comprises at least a first bit specifying the CQI.