Energy-Efficient Uplink Transmission in Sectorized Distributed Antenna Systems

Distributed antenna systems(DAS) are techniques to improve the coverage and capacity of wireless system by reducing large scale fading of wireless channels. It is especially effective in noise limited scenarios, e.g. uplink transmission. In this paper, we propose a DAS layout where multiple sectorized antennas are located at the corners of hexagonal sectors. These distributed antennas are connected with a central unit within a sector via optical fibers. Only the signals received by distributed antennas within a sector are jointly processed. The power consumption and spectrum efficiency of several uplink transmission schemes in the proposed DAS layout are evaluated and compared with those in centralized antenna systems(CAS) in multi-cell environment. Compared with the baseline in the CAS layout, user equipment(UE) in the proposed DAS layout can spare the power consumption by as much as 16.25dB suppose the same spectrum efficiency threshold. Or equivalently, average and 5% outage spectrum efficiency are improved by as much as 226% and 209% respectively with same power consumption.