Abstract
In this paper, we study the tilt optimization method in a single-cell multi-user massive multiple-input multiple-output (MIMO) system. We use the asymptotic channel orthogonality to derive the asymptotic sum rates in the uplink and the downlink, respectively. Based on the correlation property of the array steering vectors, the users are grouped based on the elevation direction-of-arrivals. Then, the optimal tilt is obtained by comparing the sum rates of the groups. Simulation results show that the proposed optimization method is effective for improving cell sum rates.
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