In this paper, we study the performance of initial access beamforming schemesin the cases with large but finite number of transmit antennas and users.Particularly, we develop an efficient beamforming scheme using geneticalgorithms. Moreover, taking the millimeter wave communication characteristicsand different metrics into account, we investigate the effect of variousparameters such as number of antennas/receivers, beamforming resolution as wellas hardware impairments on the system performance. As shown, our proposedalgorithm is generic in the sense that it can be effectively applied withdifferent channel models, metrics and beamforming methods. Also, our resultsindicate that the proposed scheme can reach (almost) the same end-to-endthroughput as the exhaustive search-based optimal approach with considerablyless implementation complexity.
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