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This work investigates the hybrid precoder scheme in a millimeter wave (mmWave) multi-user MIMO system.We study a sum rate maximization scheme by jointly designing the digital precoder and the analog precoder.To handle the non-convex problem, a block coordinate descent (BCD) method is formulated, where the digital precoder is solved by a bisection search and the analog precoder is addressed by the penalty dual decomposition (PDD) alternately.Then, we extend the proposed algorithm to the sub-connected schemes.Besides, the proposed algorithm enjoys lower computational complexity when compared with other benchmarks.Simulation results verify the performance of the proposed scheme and provide some meaningful insight.
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