Abstract
The structure that combines the digital and analog precoding for millimeter wave multi-user MIMO systems is considered in this paper. A low complexity hybrid precoder and combiner is derived based on the minimum mean square error (MMSE) method, which divides the analog precoder and analog combiner design into two stages. In the first stage, analog precoder matrix is derived by employing the MMSE method on the basis of the channel knowledge. Then analog combiner can be derived based on the MMSE criterion to maximize the array gain. Finally, a low-resolution digital precoder can be obtained by using the MMSE method as well. The proposed scheme suggests only phase control over analog precoder and combiner, since both of them are carried out by using analog phase shifters. Moreover, the proposed method requires neither iterative algorithms nor optimization methods. The simulation results show that the proposed hybrid precoding/combining outperforms the existing works in terms of the realized spectral efficiency. Moreover, it provides us a solution with low complexity.
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