Directional cell search for millimeter wave cellular systems

摘要: Millimeter wave (mmW) bands between 30 and 300 GHz are considered a promising candidate for next-generation cellular networks to relieve spectral congestion in conventional frequencies. However, communication at these frequencies will likely require highly directional transmissions achieve suitable signal range. This reliance on beamforming complicates initial cell search since the mobile base station must jointly over potentially large angular space locate path initiate communication. paper proposes procedure where each periodically transmits synchronization signals randomly varying directions. Detectors derived this based Generalized Likelihood Ratio Test (GLRT) case (i) has only analog (where can “look” direction time) (ii) digital access samples from all antennas. Simulations under realistic parameters demonstrate that mobiles may not be able detection performance with alone. In contrast, offers dramatically better performance. We argue additional power consumption cost of offset by using very low quantization rates minimal loss, thus arguing low-rate fully front-ends design choice search.