Learning Approaches to Beam Selection for Hybrid Analog Beamforming

This paper investigates the applicability of deep and machine learning techniques to perform beam selection in the uplink of a mmWave communication system. Specifically, we consider a hybrid beamforming setup comprising an analog beamforming (ABF) network followed by a zero-forcing baseband processing block. The goal is to select the optimal configuration for the ABF network bsed on the estimated angles-of-arrival (AoAs) and received powers. To that aim, we consider three machine/deep learning schemes: k-nearest neighbors (kNN), support vector classifiers (SVC), and the multilayer perceptron (MLP). We conduct an extensive performance evaluation to assess the impact of using the Capon or MUSIC methods to estimate the AoAs and powers, the size of the training dataset, the number of beamformers in the codebook, their beamwidth, or the number of active users. Computer simulations reveal that performance, in terms of classification accuracy and sum-rate, is very close to that achievable via exhaustive search.NO ACK