| 基于SWIPT的全双工中继协作系统能效研究 |
| Energy efficiency of SWIPT based full duplex relay cooperative system |
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| DOI： |
| 中文关键词: SWIPT；全双工中继协作；功率分割协议；能量效率；基于迭代的联合优化算法 |
| 英文关键词:simultaneous wireless information and power transfer (SWIPT); full duplex relay cooperation; power splitting protocol; energy efficiency; joint optimization algorithm based on iteration |
| 基金项目:国家自然科学基金（61501256）和江苏省自然科学基金（BK20150857）资助项目 |
| 作者 | 单位 | | 闫怡菲 | 南京邮电大学 通信与信息工程学院，江苏南京210003 | | 张顺外 | 南京邮电大学 通信与信息工程学院，江苏南京210003 |
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| 中文摘要: |
| 为提高无线通信能量效率以实现绿色通信，文中研究基于无线携能传输(Simultaneous Wireless Information and Power Transfer,SWIPT)技术的全双工中继协作系统能量效率优化问题，在功率分割协议下，以最大化能量效率为目标对功率分割因子和发射功率进行优化。首先，建立基于SWIPT的全双工中继协作系统模型，信源节点和目的节点配置单根天线并由电源供电，中继节点配置两根天线并通过SWIPT技术同时实现信息译码和能量收集。然后，证明能量效率是关于功率分割因子的凸函数，求解出最优功率分割因子以最大化能量效率；同时，研究了通过优化信源发射功率以提高系统能量效率的方案；并进一步提出基于迭代的联合优化算法对功率分割因子和发射功率进行联合优化。最后，通过仿真验证分析了所提优化算法的有效性，如该算法下系统能效与只优化发射功率情形相比，当功率分割因子为0.3时，能效提升约7.07%；当功率分割因子为0.1时，能效提升约61.34%。 |
| 英文摘要: |
| To improve the energy efficiency of wireless communication to achieve green communication,this paper studies the energy efficiency optimization problem of full duplex relay cooperative system based on simultaneous wireless information and power transfer (SWIPT).For the power splitting protocol,the energy efficiency is optimized for the power splitting factor and the transmission power.Firstly,a SWIPT based full duplex relay cooperative system model is established.The source node and the destination node are configured with a single antenna and are powered by external device.The relay node is configured with two antennas,and simultaneously the information decoding and the energy harvesting are implemented by SWIPT.Then,it is proved that the energy efficiency formula is a convex function with respect to the power splitting factor,and the optimal power splitting factor is obtained to maximize the energy efficiency.Meanwhile,the scheme is used to improve the energy efficiency of the system by optimizing the source transmission power.Furthermore,a joint optimization algorithm based on iteration is proposed to jointly optimize the power splitting factor and transmission power.Finally,the simulation results demonstrate the effectiveness of the proposed optimization algorithms.The energy efficiency on joint optimization algorithm is compared with that under the condition of only optimizing the transmission power.The energy efficiency is increased by about 7.07% when the power splitting factor is 0.3,and the energy efficiency is increased by about 61.34% when the power splitting factor is 0.1. |
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