单向放大转发中继D2D通信系统可达速率分析与联合功率优化.pdfVIP

第32卷第6期 2014年11月 应用科学学报 JOURNAL OF APPLIED SCIENCES——Electronics and Information Engineering V01．32 NO．6 NOV．2014 DOI：10．3969／j．issn．0255—8297．2014．06．002 单向放大转发中继D2D通信系统可达速率分析与联合功率优化 倪艺洋， 邵世祥， 朱洪波 南京邮电大学江苏省无线通信重点实验室，南京210003 摘 要：描述了基于放大转发中继underlay模式下的D2D传输模型，研究了用户最大发射功率受限前提下利用 单向放大转发中继的D2D通信系统功率分配方法．首先从D2D系统端到端信干噪比表达出发，推导出D2D链 路和蜂窝上下行链路的可达和速率，据此建立了可达和速率的联合功率优化模型，根据功率约束条件将双目标优 化模型转化为单目标优化模型；然后采用Pareto优化方法最大化可达和速率，并提出相应的低复杂度实现算法． 仿真结果表明：在中低信噪比区域，基于放大转发中继辅助的D2D通信性能显著优于传统D2D通信模式，采用 Pareto功率优化方法可进一步提升D2D通信以及蜂窝上下行链路的系统可达和速率． 关键词：D2D通信；放大转发；可达和速率；联合功率分配；Pareto优化 中图分类号：TN92 文章编号：0255—8297(2014)06-0559—07 Pareto--Optimal Power Allocation of Device-to--Device Communication with One--Way Amplify-and--Forward Relay Node NI Yi—yang， SHAO Shi—xiang， ZHU Hong-bo Jiangsu Key Laboratory 01 Wireless Communications．Nanjing University of Posts and Telecommunications，Nanjing 21 0003，China Abstract：In this paper，we describe the D2D communication strategy assisted by a relay node using a one-way amplify—and—forward(AF)protocol for the underlay mode．Based on this strategy we propose a joint—power allocation scheme to maximize the rate of both D2D and cellular link with the constraint of per- user’s maximum transmit power．To achieve this goal．we derive an expression for the achievable sum·rate of each link according to the signal-to-interference-plus·noise expressions of end—to-end uplink and downlink． According to these expressions，we set up an optimization model for jointly power allocation to maximum an achievable sum—rate．For this model，we transform the dual—objective function into a single-objective function and propose a low complexity joint—power allocation scheme by using the Pareto-optimal method to maximize the achievable sum—rate．Numerical results show that a higher gain of the sum—rate of the D2D link can be obtained by using the relay aided strategy in low and intermediate signal—to-noise regimes as compared with that of the traditional D2D mode．It is also shown that the powe