Statistical beam codebook design for mmWave massive MIMO systems

We propose a novel method to construct beam codebooks, i.e. a set of beamforming weights, for beam sweeping and data transmission in mmWave massive MIMO channels. The proposed beam codebooks are designed according to the statistical distribution of the channel's angles of departure in order to efficiently sweep the angular space covered by the beams. We first present a general closed-form construction of beam codebooks for an arbitrary distribution of angles and then tailor the results to the Laplace distribution. The resulting beams are a priori better adapted to the channel statistics and thus enhance the spectral efficiency of the transmission as compared to conventional uniform beam designs.