We continue our investigation of joint beamforming and transmit diversity with space-time block coding. In particular, the performance of a four-element array antenna is considered, in the context of an indoor wireless communication system. The main contribution is to show that transmit diversity may be practically achieved, even with correlated beams produced by a sparse array antenna.
Robert H. Morelos-Zaragoza and Mohammad Ghavami. "Combined Beamforming and Space-Time Block Coding with a Sparse Array Antenna" Faculty Publications (2002): 432-434.