Mse-optimal 1-bit Precoding for Multiuser Mimo via Branch and Bound
نویسندگان
چکیده
In this paper, we solve the sum mean-squared error (MSE)optimal 1-bit quantized precoding problem exactly for smallto-moderate sized multiuser multiple-input multiple-output (MU-MIMO) systems via branch and bound. To this end, we reformulate the original NP-hard precoding problem as a tree search and deploy a number of strategies that improve the pruning efficiency without sacrificing optimality. We evaluate the error-rate performance and the complexity of the resulting 1-bit branch-and-bound (BB-1) precoder, and compare its efficacy to that of existing, suboptimal algorithms for 1-bit precoding in MU-MIMO systems.
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