Combining Eigen-Beamforming and Space-Time Block Coding with Equal Power Allocation

A wireless transmission scheme combining eigen-beamforming and space-time block coding (STBC) is proposed and the transmission performances are investigated under both the uncorrelated and correlated transmit antennas, separately. By minimizing the upper bound of the symbol error rate, the design of eigen-beamforming could provide the diversity order. Besides the careful power allocation for the common beamforming, this paper shows that the transmission power can be simply allocated equally to every beams to achieve the transmit diversity when the eigen-beamforming is combined with STBC. Numerical simulation results show that the transmit diversity of STBC can be further improved by eigen-beamforming with equal power allocation.