Two main concerns for designing a wireless system are more network capacity and less energy consumption. Recently, distributed\nantenna system (DAS) has received considerable attention due to its potential to provide higher spectral efficiency (SE) and uniform\ncoverage for cellular networks. In this regard, this paper compares the performance of DAS with centralized antenna system (CAS)\nin LTE-A system in terms of energy efficiency (EE), where practical restrictions such as out-of-cell interference, path loss, and small\nscale fading are taken into account. Furthermore, the EE and system power consumption are investigated under three different\ncell-load scenarios (high, moderate, and low load) where different numbers of antennas are activated and remaining of antennas\nare under sleep mode. Finally, based on the tradeoff between power-saving and EE, two optimal DAS antenna deployments are\nproposed for low and moderate cell-load scenarios. The results reveal that DAS considerably outperforms CAS in terms of EE\nand by optimal deploying antennas of DAS significant power-saving and EE are achievable. The proposed methodology achieved\nsavings of up to 27.63% in terms of energy savings in a macrocell with guarantee of a high capacity of data.
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