Diversity Coding for Instantaneous Link Recovery in Millimeter Wave Communications

摘要

Millimeter Wave systems face significant challenges for robust signal transmission in the presence of aggregated path loss and penetration losses. Namely, once the link between the mobile and base stations is successfully established, i.e., based upon initial access schemes that determine the optimum beamforming and combing vectors at which the optimum signal level is detected. However, the signal associated with the optimum link can rapidly degrade due to increased obstacles in the link of various densities and sizes. This yields in reduced signal levels and link failure, consequently resulting in communication loss during control- or user-planes. This paper presents efficient link recovery scheme based upon diversity coding for multi-beam transmissions to overcome blockage effects. The proposed scheme features near-instantaneous link recovery times without the need for repeated beam search over all spatial directions, as compared to traditional recovery schemes that perform exhaustive and iterative beam to determine the new optimum direction.