| （英） |
As a method of implementing MU-MIMO downlink, MMSE-CI (Minimum Mean Square Error Channel Inversion) algorithm is known as a channel inversion algorithm suppressing sufficiently multi-user interference (MUI). Also, Block Diagonalization (BD) was proposed in which the transmission weights are determined to completely cancel the MUI in a similar manner to Zero-Forcing (ZF). On the other hand, Block Maximum Signal-to-Noise ratio (BMSN) has been proposed which determines the transmission weights to enhance the gain for each user terminal in addition to the MUI cancellation, and it is shown that BMSN outperforms BD because of the gain control. In a real environment of MU-MIMO transmission, there may be no obstacle between the base station and the users. In this study, therefore, we consider line-of-sight radio waves and compare the performance between MMSE-CI, BD and BMSN under Rice fading environment by computer simulation to clarify their difference in MU-MIMO transmission. |