Abstract
Energy efficiency (EE) and spectral efficiency (SE) are two key performance metrics for technological advances in current and emerging wireless communication networks. The demand for higher SE has increased dramatically due to multimedia applications in wireless networks. In the past decade, there has been tremendous work to improve system SE and throughput. In recent years, EE has received increasing attention due to environmental concerns and steadily rising energy costs. Distributed antenna systems (DAS) have been introduced as a promising candidate for next generation wireless mobile communication systems due to advantages in link reliability, capacity, and extended coverage. Thus, increasing the EE of a DAS while satisfying SE requirements is a significant issue. We discuss energy-efficient power allocation criteria for DAS, energy-efficient resource allocation for OFDM-DAS, energy-efficient transmission for MISO-DAS, and energy-efficiency optimization for MIMO-DAS. The corresponding energy-efficient optimization methods are also proposed. Simulation results demonstrate the effectiveness of the proposed scheme.
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