  Smart Repeaters (SR) can potentially enhance the coverage in Millimeter-wave
(mmWave) wireless communications. However, the angular coverage of the existing
two-panel SR is too limited to make the SR a truly cost-effective mmWave range
extender. This paper proposes the usage of a tri-sectoral Advanced SR (ASR) to
extend the angular coverage with respect to conventional SR. We propose a
multi-user precoder optimization for ASR in a downlink multi-carrier
communication system to maximize the number of served User Equipments (UEs)
while guaranteeing constraints on per-UE rate and time-frequency resources.
Numerical results show the benefits of the ASR against conventional SR in terms
of both cumulative spectral efficiency and number of served UEs (both improved
by an average factor 2), varying the system parameters.
