Low-Complexity Robust Beamforming with Blockage Prediction for Millimeter-Wave Communications

We propose a low-complexity robust beamforming algorithm for millimeter-wave (mm Wave) Coordinated MultiPoint (CoMP) architectures subject to random path blockages due to moving objects such as human bodies and the low scattered nature of mm Wave channels. In order to tackle this difficulty without dealing with computationally-demanding possible combinations of channel statistics, which are considered to be a bottleneck of the existing state-of-the-art method for this issue, we introduce a weighted-sum formulation of the latter problem as well as the associated effective weight design, which is shown to be efficient from a complexity point-of-view in comparison with the other state-of-the-art alternatives. Aiming to clarify the above, complexity-order analyses in terms of floating point operations per second (flops) are also provided for both the proposed and state-of-the-art robust beamforming designs for mm Wave path blockages. Simulation results illustrate the superior performance of the proposed method to the state-of the-art in terms of the performance-complexity trade-off, also demonstrate the legitimacy of the complexity analyses derived in this paper.