Antenna selection and training using a spatial spreading matrix for use in a wireless mimo communication system

A first communication device, the first communication device comprising:

• a transceiver device having a number, NR, of receiving chains, the transceiver device configured to
• receive channel sounding information during an antenna selection training procedure, wherein the channel sounding information either (a) was transmitted using different subsets of a set of transmission antennas of a second communication device, or (b) is received using different subsets of a set of receiving antennas coupled to the transceiver,
• perform antenna selection computations that (i) use the channel sounding information received during the antenna selection training procedure, (ii) assume that the second communication device uses a first Nss columns of a full-dimensional spatial spreading matrix to transmit the channel sounding information during the antenna selection training procedure, and (iii) accounts for the use, by the second communication device, of the first Nss columns of the full-dimensional spatial spreading matrix when transmitting Nss spatial streams, and
• one of
• (i) (a) generate antenna selection feedback using the antenna selection computations, and (b) transmit, to a second communication device, the antenna selection feedback, or
• (ii) select a subset of the set of receiving antennas for use by the first communication device using the antenna selection computations,
• wherein the full-dimensional channel spatial spreading matrix has components associated with i) a row dimension having a number of rows equal to a number, NT, of transmission chains to be used by the second communication device to transmit spatial data streams, and ii) a column dimension having a number of columns equal to NT, and
• wherein Nss is less than both NT and NR.

A non-transitory computer readable storage medium having stored thereon machine readable instructions that, when executed by a processing device of a first communication device, cause the processing device to:

• perform antenna selection computations that (i) use channel sounding information received by the first communication device during an antenna selection training procedure, (ii) assume that a second communication device uses a first Nss columns of a full-dimensional spatial spreading matrix to transmit the channel sounding information during the antenna selection training procedure, and (iii) accounts for the use, by the second communication device, of the first Nss columns of the full-dimensional spatial spreading matrix when transmitting Nss spatial streams;
• and
• one of
• (i) generate antenna selection feedback using the antenna selection computations, wherein the antenna selection feedback is for transmission from the first communication device to the second communication device, or
• (ii) select a subset of the set of receiving antennas of the first communication device using the antenna selection computations,
• wherein (i) the first communication device has a number, NR, of receiving chains, and (ii) the channel sounding information either (a) was transmitted using different subsets of a set of transmission antennas of the second communication device, or (b) is received using different subsets of a set of receiving antennas of the first communication device,
• wherein the full-dimensional channel spatial spreading matrix has components associated with i) a row dimension having a number of rows equal to a number, NT, of transmission chains to be used by the second communication device to transmit spatial data streams, and ii) a column dimension having a number of columns equal to NT, and
• wherein Nss is less than both NT and NR.