Precoding signaling in a MIMO wireless communication system

A second transceiver for receiving data, comprising:

• a feedback message generator generating a feed back message in response to a reference signal received from a first transceiver and transmitting the feed back message to the first transceiver;
• a memory storing the feedback message in association with an identifier;
• and
• a processing unit which, when receiving a data signal and an identifier of a feedback message, reads a feedback message in the memory associated with the identifier received, and processes the data received in dependence upon the feedback message.

A method for performing data transmission, the method comprising the steps of:

• transmitting, via a first transceiver, a reference signal to a second transceiver;
• generating a feedback message at the second transceiver in response to the reference signal received from the first transceiver;
• transmitting, via the second transceiver, the feedback message to the first transceiver and storing the feedback message in the second transceiver;
• transmitting, via the first transceiver, a data and a control message according to either a first transmission format determined in dependence upon the feedback message received from the second transceiver or a second transmission format that is not related to the feedback message received from the second transceiver;
• when the first transmission format is used, the first transceiver informing the second transceiver that the transmission format is determined based on the feedback message received from the second transceiver;
• and
• when the second transmission format is used, the first transceiver informing the second transceiver that the transmission format is not related to the feedback message received from the second transceiver and transmitting the second transmission format to the second transceiver.

A method for performing data transmission, the method comprising the steps of:

• transmitting, via a first transceiver, a reference signal to the second transceiver;
• generating a feedback message at the second transceiver in response to the reference signal received from the first transceiver and transmitting the feedback message to the first transceiver;
• transmitting data from the first transceiver to the second transceiver, and transmitting a control message which carries a transmission format used for the data transmission;
• and
• decoding, at the second transceiver, the control message in order to obtain the transmission format of the data transmitted from the first transceiver, and, when the decoding is successful, processing the data received from the first transceiver according to the obtained transmission format, and when the decoding is unsuccessful, processing the data received from the first transceiver according to a most recent feedback message that the second transceiver has sent to the first transceiver.

A second transceiver for receiving data transmitted from a first transceiver, comprising:

• a feedback message generator for generating a feed back message in response to data received from a first transceiver;
• a memory for storing the feedback message;
• and
• a decoder for decoding a control message transmitted from the first transceiver in order to obtain a transmission format of the data transmitted from the first transceiver, with, when the decoder decodes the62ontrol message successfully, the second transceiver processes the data transmitted from the first transceiver according to the transmission format obtained by the decoder, and when the decoder decodes the control message unsuccessfully, the second transceiver processes the data transmitted from the first transceiver according to the feedback message in the memory.