Patent ID: 8379747

Claim:
A spatial sub-channel selection and pre-coding apparatus for being operative in a first communication device, the first communication device being adapted for communicating with a second communication device and a third communication device using MIMO (MIMO=Multiple-Input-Multiple-Output) radio channels, a first MIMO radio channel extending between the first communication device and the second communication device having at least one spatial sub-channel, a second MIMO radio channel extending between the first communication device and the third communication device having at least one spatial sub-channel, wherein one of the first MIMO radio channel or the second MIMO radio channel has at least two spatial sub-channels, comprising: a MIMO radio channel decomposer for decomposing the first MIMO radio channel and/or the second MIMO radio channel into a plurality of spatial sub-channels and for providing a transmission capacity measure for each of the spatial sub-channels; a selector for selecting a first spatial sub-channel for transmission based on the transmission capacity measures from the plurality of spatial sub-channels, where other spatial sub-channels not selected by the selector are non-selected spatial sub-channels; a MIMO radio channel processor for processing the first or the second MIMO radio channel based on the first spatial sub-channel to obtain a processed MIMO radio channel having at least one non-selected processed spatial sub-channel in a way such that a possible interference on the first spatial sub-channel caused by the at least one non-selected processed spatial sub-channel is reduced or eliminated; wherein the selector is adapted for selecting a non-selected processed spatial sub-channel of the processed MIMO radio channel as second spatial sub-channel for transmission; a sum capacity evaluator for evaluating a first sum capacity measure on the MIMO radio channel based on the first spatial sub-channel, and for evaluating a second sum capacity measure on the MIMO radio channel based on the first and the second spatial sub-channels, wherein the selector is adapted for de-selecting the second spatial sub-channel from transmission, when the second sum capacity measure indicates a lower sum capacity on the MIMO radio channel than the first sum capacity measure; and a pre-coding information generator for generating a pre-coding information for the first spatial sub-channel in such a way that an interference on the second spatial sub-channel caused by the first spatial sub-channel is decreased or eliminated.