  Millimeter-wave is one of the technologies powering the new generation of
wireless communication systems. To compensate the high path-loss,
millimeter-wave devices need to use highly directional antennas. Consequently,
beam misalignment causes strong performance degradation reducing the link
throughput or even provoking a complete outage. Conventional solutions, e.g.
IEEE 802.11ad, propose the usage of additional training sequences to track beam
misalignment. These methods however introduce significant overhead especially
in dynamic scenarios. In this paper we propose a beamforming scheme that can
reduce this overhead. First, we propose an algorithm to design a codebook
suitable for mobile scenarios. Secondly, we propose a blind beam tracking
algorithm based on particle filter, which describes the angular position of the
devices with a posterior density function constructed by particles. The
proposed scheme reduces by more than 80% the overhead caused by additional
training sequences.
