Performance Assessment for the Selection Transmit Diversity in Adaptive Polarized MIMO Pre-RAKE System

This paper evaluates the performance of the Selection Transmit Diversity (STD) technique in adaptive Polarized Multiple-Input Multiple-Output (MIMO) Pre-RAKE system. The proposed system will be examined in Frequency Division Duplex (FDD) mode. For the same spatial dimensions, the proposed system will be compared with the Pre/Post RAKE systems and the single-polarization Pre-RAKE STD systems. As will be shown, our system can achieve a much better performance in addition to simplify the receiver´s implementation. Also, the system performance will be investigated in case of excluding the cross-pol Pre-RAKEs in the base station. The paper discusses the effect of the polarization diversity characteristics as well as the impact of the imbalance in the co-polarized power intensities on the BER performance. For slowly-varying channels, an assessment for the system performance will be investigated under different Feedback Information (FBI) rates. In addition, a performance comparison for vehicular and pedestrian environments will be presented.