| 摘要 |
The present invention relates to a method for channel quality estimation in a wireless data communication system, wherein data streams are transmitted from a transmitter having multiple antennas and/or antenna elements to a receiver over a frequency band, wherein, during a first period of time, data streams are transmitted on at least one sub-band of the frequency band using a first beamforming constellation, and wherein, during a subsequent second period of time, data streams are transmitted on said sub-band using a second beamforming constellation. The method further includes a training step, during the first period of time, wherein a data stream is transmitted on a portion of, or adjacent to, said sub-band while using the beamforming constellation to be used in said second period of time. The present invention also relates to a system, a transmitter and a communication system.
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