Method and apparatus for supporting multi-user and single-user MIMO in a wireless communication system

An apparatus for receiving data in a wireless communication system, comprising:

• means for determining a channel gain for each of multiple cells by a user equipment (UE) including a first channel gain from a serving cell and a second channel gain from a non-serving cell, wherein the channel gain comprises a gain from each transmit antenna of a cell to each receive antenna of the UE;
• means for computing, by the UE, a receive filter using at least a set of vectors determined from the first channel gain;
• means for generating a first virtual channel vector by applying the receive filter to at least a portion of a first channel matrix that includes the first channel gain;
• means for generating a second virtual channel vector by applying the receive filter to at least a portion of a second channel matrix that includes the second channel gain;
• means for sending, from the UE, the first virtual channel vector to the serving cell and the second virtual channel vector to the non-serving cell;
• and
• means for receiving a data transmission sent by the serving cell based on the first virtual channel vector.

An apparatus for wireless communication, comprising:

• at least one processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• determine a channel gain for each of multiple cells by a user equipment (UE) including a first channel gain from a serving cell and a second channel gain from a non-serving cell, wherein the channel gain comprises a gain from each transmit antenna of a cell to each receive antenna of the UE,
• compute a receive filter using at least a set of vectors determined from the first channel gain,
• generate a first virtual channel vector by applying the receive filter to at least a portion of a first channel matrix that includes the first channel gain,
• generate a second virtual channel vector by applying the receive filter to at least a portion of a second channel matrix that includes the second channel gain,
• send, from the UE, the first virtual channel vector to the serving cell and the second virtual channel vector to the non-serving cell, and
• receive a data transmission sent by the serving cell based on the first virtual channel vector.

A computer program product, comprising:

• a non-transitory computer-readable storage medium comprising:
• code for causing at least one computer to determine a channel gain for each of multiple cells by a user equipment (UE) including a first channel gain from a serving cell and a second channel gain from a non-serving cell, wherein the channel gain comprises a gain from each transmit antenna of a cell to each receive antenna of the UE,
• code for causing the at least one computer to compute a receive filter using at least a set of vectors determined from the first channel gain,
• code for causing the at least one computer to generate a first virtual channel vector by applying the receive filter to at least a portion of a first channel matrix that includes the first channel gain,
• code for causing the at least one computer to generate a second virtual channel vector by applying the receive filter to at least a portion of a second channel matrix that includes the second channel gain;
• code for causing the at least one computer to send, from the UE, the first virtual channel vector to the serving cell and the second virtual channel vector to the non-serving cell, and
• code for causing the at least one computer to receive a data transmission sent by the serving cell based on the first virtual channel vector.