CSI Feedback Reduction for Energy-Efficient Downlink OFDMA
The explosively increasing demand of high-data-rate multimedia wireless services and ubiquitous access has triggered rapidly booming energy consumption at the wireless network operator side. Therefore, energy-efficient design is becoming a mainstream for future wireless networks. In this paper, the authors study energy-efficient resource allocation in downlink OFDMA networks with partial Channel State Information at the Transmitter (CSIT). To reduce the Channel State Information (CSI) feedback overhead while maintaining relatively high achievable Energy Efficiency (EE), they propose a novel CSI feedback scheme, which leads to higher EE with lower feedback overhead compared with the conventional Selective Feedback (SF) and Bit-map based Feedback (BF) schemes.