Method for communicating in a network

A method for operating a primary station in a network comprising a primary station and at least one secondary station, the method comprising:

• in a primary station comprising a plurality of transmit antennas:
• selecting a first communication scheme from a plurality of communication schemes for communicating with a secondary station comprising a plurality of antenna,
• computing a transmission vector on the basis of the selected first communication scheme,
• wherein the first communication scheme is different from a predetermined communication scheme being used by the secondary station.

A radio communication apparatus for use in a network comprising the apparatus and at least one secondary station, the radio communication apparatus comprising:

• a plurality of transmit antennas,
• a controller configured to select a first communication scheme from a plurality of communication schemes for communicating with a secondary station in a network,
• the controller being further configured to compute a transmission vector on the basis of the selected first communication scheme,
• wherein the selected first communication scheme is different from a predetermined communication scheme being used by the secondary station.

A radio communication apparatus for use in a network comprising a primary station and the radio communication apparatus, the radio communication apparatus comprising:

• a plurality of receive antennas,
• a receiver configured to receive, from the primary station, coefficients used in post processing,
• a controller configured to:
• select a first communication scheme from a plurality of communication schemes,
• derive post-processing coefficients based on the characteristics of the selected first communication scheme and an observed channel between a plurality of transmit antennas of the primary station and the plurality of receive antennas of the radio communication apparatus,
• estimate a combined channel based on the observed channel and the results of the post-processing using the controller derived post processing coefficients,
• assemble a CSI (Channel State Information) report assuming characteristics of a second communication scheme currently in use by the radio communication apparatus and according to the estimated combined channel, and
• a transmitter configured to transmit the Channel State Information (CSI) report to the primary station.

A method for operating a communication system in a network, the system comprising a primary station and at least one secondary station the method comprising:

• in a primary station having a plurality of transmit antennas:
• selecting, by the primary station, a first communication scheme among a plurality of communication schemes for communication with a secondary station having a plurality of receive antennas,
• computing, by the primary station, a transmission vector on the basis of the first communication scheme for communicating with a secondary station,
• computing, by the secondary station, a reception vector on the basis of a second communication scheme, the second communication scheme being selected among the plurality of communication schemes by the secondary station on the assumption that a predetermined first communication scheme is being used by the primary station.

A system comprising a primary station and at least one secondary station, comprising:

• a primary station comprising a plurality of transmit antennas and a secondary station comprising a plurality of receive antennas,
• the primary station configured to select a first communication scheme among a plurality of communication schemes,
• the primary station configured to compute a transmission vector on the basis of the selected first communication scheme,
• the secondary station configured to compute a reception vector on the basis of a second communication scheme, the second communication scheme being selected among the plurality of communication schemes by the secondary station on the assumption that a predetermined communication scheme is being used by the primary station.