Link adaptation for MIMO transmission schemes

A transmitter for a MIMO transmission system, comprising:

• multiple transmit antennas;
• first circuitry configured to divide information to be transmitted into a plurality of subsignals according to a number of used transmit antennas and to process each subsignal separately before transmission by a respective transmit antenna;
• second circuitry for receiving a feedback signal from a receiver, the feedback signal including a pre-calculated set of link control information selected from a group of pre-calculated sets of link control information that best matches a first set of link control information calculated for each subsignal, wherein the link control information includes a capacity associated with each subsignal;
• wherein the first circuitry is configured to process subsignals to be transmitted over the multiple antennas in accordance with the pre-calculated set of link control information.

A receiver for use in a MIMO communication system, comprising:

• multiple receive antennas for communicating with a transmitter having multiple transmit antennas over a radio channel;
• a receiver for receiving at the multiple receive antennas a received signal transmitted from the transmitter at which information to be transmitted was divided into multiple subsignals and transmitted from the transmit antennas;
• a decoder for decoding subsignals from the received signal;
• a subtracter for subtracting a contribution of each detected and decoded subsignal from the received signal;
• and
• circuitry configured to:
• calculate a capacity associated with each subsignal;
• determine link control information based on the capacity calculated for each subsignal to generate a first set of link control information;
• compare the first set of link control information with multiple sets of pre-calculated link control information;
• select one of the pre-calculated sets best matching the first set of link control information;
• and
• transmit a feedback signal from the receiver to the transmitter including the selected pre-calculated set of link control information for use by the transmitter in processing future subsignals to be transmitted over the multiple antennas.