BEAMFORMOING TO TRANSMIT DIVERSITY OF SPACE-TIME CODED SIGNALS

摘要

Methods and apparatus for increasing diversity gain al a receiver by applying beamforming to transmit diversity j space-time coded signals. Transmit diversity can be provided at a signal source by space-time coding the signal. A transmit signal is space-time coded over a plurality of space-time antenna groups, with each space-time antenna group associated with a specific space-time code. The signal at each space-time antenna group is beamformed over the plurality of antenna in the space-time antenna I group. Each of the plurality of antenna in a space-time antenna group is weighted with a distinct weight, relative to the other antenna ) in the space-time group. Each weight can have a distinct amplitude, phase, or combination of amplitude and phase. The weights canbe static or dynamic. The dynamic weights can vary amplitude, phase, or a combination of amplitude and phase of each weight over time.