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  

Pareto-Optimal Power Allocation of Device-to-Device Communication with One-Way Amplify-and-Forward Relay Node

作　　者：倪艺洋 邵世祥[1] 朱洪波[1] 

机构地区：[1]南京邮电大学江苏省无线通信重点实验室,南京210003

出　　处：《应用科学学报》2014年第6期559-565,共7页Journal of Applied Sciences

基　　金：国家科技重大专项基金(No.2011ZX03005-004-03);国家"973"重点基础研究发展计划基金(No.2013CB329005);国家自然科学基金(No.61171093);江苏省优势学科建设项目基金(No.YX002001)资助

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.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 power optimal scheme can further be improved for the achievable sum-rate of D2D and cellular links by using the Pareto-optimal method.

关 键 词：D2D通信 放大转发 可达和速率 联合功率分配 PARETO优化 

分 类 号：TN92[电子电信—通信与信息系统]