Figure 4From: On the user performance of orthogonal projection signal alignment scheme in MIMO relay systemsOP-SI scheme vs. ZF-SI scheme with perfect CSI. Figure4 shows the comparison of ergodic sum rate between the OP-SI scheme and the ZF-SI scheme with perfect CSI. The number of user are set as 2, 4, 6, respectively, and the number of relay antennas is M + 1. As shown in the figure, the OP-SI scheme can always achieves higher ergodic sum rate than the ZF-SI scheme.Back to article page