Downlink Beamforming Technique for MU-MIMO-OFDM Systems

Multiuser—Multi carrier systems like MU-MIMO-OFDM Systems has been widely known for offering maximum spatial diversity along with maximum spectral efficiency which is of high importance in wireless systems. We have analyzed the performance of equalization techniques like Maximum Ratio Combining (MRC) and Minimum Mean Square Error (MMSE) in this multi-carrier system and it is inferred that MMSE is the optimal equalization technique for MIMO-OFDM System. Beamforming and combining strategies are extensively used to harness spatial diversity gains in MU-MIMO-OFDM systems. This work also introduced the beamforming technique at the transmitter with STBC coding to further improve the performance of the system.