Robust Beam-Alignment for TWDP Fading Millimeter Wave Channels

In this paper, we consider hybrid transmit and receive beam-alignment in wireless millimeter wave transmissions. As several channel measurement campaigns have shown, the millimeter wave channel exhibits a limited number of scattering clusters, where each cluster can be well modeled by a small number of rays. To account for this behavior, we consider a clustered channel model with each cluster being modeled as two-wave with diffuse power (TWDP) fading. It is well known that TWDP fading can lead to worse outage performance than Rayleigh fading. We therefore propose several hybrid beam selection and power loading strategies to achieve robust transmission and we investigate their outage performance by means of Monte Carlo simulations.