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We propose a Wiener filter (WF) and a combined zero forcing (ZF)/WF precodings with ant colony optimization (ACO) algorithms as the digital precoder for millimeter wave multiple-input multiple-output (MIMO) systems. In the proposed schemes, beams are selected based on maximal magnitude (MM) criteria and the selection is optimized using ACO algorithm to achieve near optimal solution with highly reduced complexity. According to the simulation results, while ACO-WF scheme achieves higher sum ratedoi:10.1587/comex.2019spl0018 fatcat:k2hc44sxlfb3new36a3tatiupi