Liner MMSE receiver design in MIMO decoupled space-time code systems

The authors describe a process for designing receive diversity scheme for use in multiple-input multiple-output (MIMO) systems. In particular, a remarkably simple space-time block coded (STBC) scheme that are capable of attaining a significant fraction of the open-loop Shannon capacity of the MISO channel is derived. In this correspondence, we propose a liner minimum mean squared error (MMSE) decoder that are especially designed for the receive diversity. The resulting computational complexity will, in general, be inconspicuous. Moreover, their mathematically tractable forms readily enable us to evaluate the performance of MIMO systems that utilize STBCs. For sufficient receiving antenna number, asymptotically tight approximations for the capacity of MIMO antenna systems, which reveal insights into the effects of receive diversity on the system´s performance. Finally, the numerical results show the proficiency of our design procedure, demonstrating that significant improvements in both capacity and BER are achievable.