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This paper develops stream combining techniques for rate-splitting (RS)multiple-antenna systems with multiple users to enhance the common rate. Wepropose linear combining techniques based on the Min-Max, the maximum ratio andthe minimum mean-square error criteria along with Regularized BlockDiagonalization (RBD) precoders for RS-based multiuser multiple-antennasystems. An analysis of the sum rate performance is carried out, leading toclosed-form expressions. Simulations show that the proposed combining schemesoffer a significant sum rate performance gain over conventional linearprecoding schemes.

Study of Linear Precoding and Stream Combining for Rate Splitting in MU-MIMO Systems