Space-time coding/decoding with adaptive transmit beamforming in semi-correlated MIMO wireless communication systems

It has been proved that Transmit diversity and Space-Time Coding (STC) technology can achieve an optimal transmission and capacity increment in Multi-input Multi-Output (MIMO) wireless communication systems. However, recent contributions have demonstrated that fading correlations destroy most of their advantages. How to combat the fading correlation is an interesting problem for multiple antenna systems. Extending the concept of transmit beamforming, our research use the multi-beamforming correlation characteristics to overcome fading correlation in transmit diversity. Considering the case of having the knowledge about the channel at transmitter side, a subspace based decoding is achieved at receiver. The proposed scheme benefits from adaptive beamforming in achieving STC and obtains the diversity lain on the forward link. And it also offers an optimum transmission of power, a reduction in interference and an incensement of system capacity. Numerical simulations are presented in this paper to illustrate the effectiveness of this structure.