| 摘要 |
Methods and apparatus for increasing diversity gain at a receiver by appl ying beamforming to transmit diversity space-time coded signals. A transmit signal is space-time coded over a plurality of space-time antenna groups, wi th each space-time antenna group associated with a specific space-time code. The signal at each space-time antenna group is beamformed over the pluralit y of antenna in the space-time antenna group. Each of the plurality of anten na in a space-time antenna group is weighted with a distinct weight, relativ e to the other antenna in the space-time group. The beamforming weights can vary based on a channel quality feedback indication from a receiver. The amp litude, phase, or a combination of amplitude and phase of each weight or of a vector of multiple weights can vary as a function of the channel quality i ndication in order to improve the quality of the received signal.
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