Downlink Power Allocation For Wireless Information And Energy Transfer In Macrocell-Small Cell Networks
2016 IEEE Wireless Communications and Networking Conference(2016)
摘要
Wireless information and energy transfer in multi-tier cellular networks is a new research paradigm in wireless communications. While interference mitigation is one of the major challenges in conventional multi-tier networks, wireless energy harvesting capability considers interference signal as a source of energy. In this paper, we consider simultaneous wireless information and energy transfer in two-tier cellular networks and perform downlink power allocation with two different objectives. To maximize the sum of energy harvesting rate of small cell users, we formulate a linear programming problem whereas to maximize the sum of their information rate, we formulate a non-convex optimization problem. We solve the non-convex optimization problem by using convex-concave procedure and dual decomposition method. Numerical results indicate that the small cell users are exposed to high interference signal when maximum energy harvesting rate is desired and that received interference contributes a large portion of their total harvested energy. The trade-off between information rate and energy harvesting rate is found to be more prominent in terms of the interference signal rather than the power splitting factor since both information rate and energy harvesting rate are maximized when infinitesimally small power is split to the information decoder circuit.
更多查看译文
关键词
Two-tier cellular networks,small cells,interference management,wireless information and energy transfer
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络