Rate adaptive transmission scheme for MIMO systems

An apparatus used in a multiple-input multiple-output (MIMO) communication system, the apparatus comprising:

• means for receiving at least one data symbol stream, each of the at least one data symbol stream being scaled with a respective weight corresponding to an amount of transmit power allocated to the data symbol stream, wherein a total amount of transmit power allocated to the at least one data symbol stream is less than or equal to total transmit power available for a transmitter;
• and
• means for processing, at the transmitter, the at least one data symbol stream with a transmit basis matrix to provide a plurality of transmit symbol streams for transmission via a plurality of antennas at the transmitter, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding antenna.

A non-transitory computer readable medium having program code recorded thereon, said program code comprising:

• program code to cause at least one processor to receive at least one data symbol stream, each of the at least one data symbol stream being scaled with a respective weight corresponding to an amount of transmit power allocated to the data symbol stream, wherein a total amount of transmit power allocated to the at least one data symbol stream is less than or equal to total transmit power available for a transmitter;
• and
• program code to cause the at least one processor to process, at the transmitter, the at least one data symbol stream with a transmit basis matrix to provide a plurality of transmit symbol streams for transmission via a plurality of antennas at the transmitter, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding antenna.

A method of processing symbols in a multiple-input multiple-output (MIMO) communication system, the method comprising:

• receiving a plurality of transmit symbol streams via a plurality of receive antennas at a receiver, wherein the plurality of transmit symbol streams are obtained at a transmitter by processing at least one data symbol stream with a transmit basis matrix before transmission from a plurality of transmit antennas at the transmitter to the plurality of receive antennas at the receiver, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of transmit antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding transmit antenna;
• and
• processing the plurality of received transmit symbol streams to recover the at least one data symbol stream.

An apparatus used in a multiple-input multiple-output (MIMO) communication system, the apparatus comprising:

• means for receiving a plurality of transmit symbol streams via a plurality of receive antennas at a receiver, wherein the plurality of transmit symbol streams are obtained at a transmitter by processing at least one data symbol stream with a transmit basis matrix before transmission from a plurality of transmit antennas at the transmitter to the plurality of receive antennas at the receiver, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of transmit antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding transmit antenna;
• and
• means for processing the plurality of received transmit symbol streams to recover the at least one data symbol stream.

A non-transitory computer readable medium having program code recorded thereon, said program code comprising:

• program code to cause at least one processor to receive a plurality of transmit symbol streams from a plurality of receive antennas at a receiver, wherein the plurality of transmit symbol streams are obtained at a transmitter by processing at least one data symbol stream with a transmit basis matrix before transmission from a plurality of transmit antennas at the transmitter to the plurality of receive antennas at the receiver, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of transmit antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding transmit antenna;
• and
• program code to cause the at least one processor to process the plurality of received transmit symbol streams to recover the at least one data symbol stream.