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Energy-efficient resource allocation for OFDMA relay systems with imperfect CSIT

OFDMA 中继系统基于非完美 CSIT 的能效资源分配

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Abstract

In this paper, we propose an energy-efficient resource allocation scheme for the downlink of decode-and-forward relay-assisted orthogonal frequency division multiple access systems. The resource allocation is designed based on imperfect channel state information at the transmitter. We jointly optimize the power allocation, data rate allocation, and subcarrier allocation to maximize the system energy efficiency (EE). We formulate the EE problem as a probabilistic mixed non-convex optimization problem, in which the individual power constraints and the outage probability requirements are considered. An iterative algorithm based on bisection method is given to transform the optimization problem into a standard concave form. Also, we consider a proportional fairness design for the EE maximization problem. Simulation results illustrate the effectiveness of the proposed algorithm.

创新点

针对下行OFDMA中继系统, 本文提出一种能量效率最优的资源分配方案。基于非完美的信道状态信息, 该方案通过联合地分配发射功率、速率和子载波, 获得了最大的系统能量效率。本文对非凸的混合优化问题进行了一系列的等效转化, 同时提出一种基于二分法的迭代算法。仿真结果表明该方案可以有效地提高系统的能量效率, 并且表明系统的能量效率与频谱效率、用户公平性之间存在折衷关系。

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Authors and Affiliations

  1. National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China

    XiaoMing Wang, FuChun Zheng, PengCheng Zhu, Chao Meng & XiaoHu You

  2. School of Systems Engineering, University of Reading, Reading, RG6 6AY, UK

    FuChun Zheng

Authors
  1. XiaoMing Wang
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  2. FuChun Zheng
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  3. PengCheng Zhu
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  4. Chao Meng
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  5. XiaoHu You
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Correspondence to XiaoMing Wang.

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Wang, X., Zheng, F., Zhu, P. et al. Energy-efficient resource allocation for OFDMA relay systems with imperfect CSIT. Sci. China Inf. Sci. 58, 1–13 (2015). https://doi.org/10.1007/s11432-015-5340-8

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  • DOI: https://doi.org/10.1007/s11432-015-5340-8

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