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In this work, we investigate Block Diagonalization (BD) techniques formultiuser multiple-antenna systems using rate-splitting (RS) multiple access.In RS multiple access the messages of the users are split into a common partand a private part in order to mitigate multiuser interference. We present thesystem model for a RS multiple access system operating in a broadcast channelscenario where the receivers are equipped with multiple antennas. We alsodevelop linear precoders based on BD for the RS multiple access systems alongwith combining techniques, such as the min-max criterion and the maximum ratiocombining criterion, to enhance the common rate. Closed-form expressions todescribe the sum rate performance of the proposed scheme are also derived. Theperformance of the system is evaluated via simulations considering imperfectchannel state information at the transmitter. The results show that theproposed schemes outperform conventional linear precoding methods.

Study of Rate-Splitting Techniques with Block Diagonalization for Multiuser MIMO Systems