Zhiqiang Chen, Xiangming Wen, Zhaoming Lu, Wenpeng Jing, Zeguo Xi, Kun Chen. Energy efficiency optimization in OFDMA heterogeneous networks with RF energy harvesting. In 27th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2016, Valencia, Spain, September 4-8, 2016. pages 1-6, IEEE, 2016. [doi]