D2D通信系统中的最优中继选择及功率分配策略研究

发布时间：2018-03-12 17:44

本文选题：DD通信　切入点：中继选择　出处：《重庆邮电大学学报(自然科学版)》2014年05期 　论文类型：期刊论文

【摘要】：在D2D(device-to-device)通信系统与蜂窝网络共存的场景下,引入中继节点可以有效提高D2D链路的吞吐量同时减小D2D链路对蜂窝网络的干扰。阐述了一种新颖的半双工放大转发双向中继协助D2D通信方案,提出了对应的最优中继选择及功率分配算法。该算法能够在满足蜂窝系统所受干扰小于一定门限值的约束下最大化D2D链路的吞吐量。该算法优化了D2D链路上各发送节点的发送功率;选出了可以使D2D链路吞吐量最大化的中继节点作为最优中继节点。其中,在计算最优功率分配的时候,利用拉格朗日对偶理论以及最速下降法对原功率分配优化问题的对偶问题进行了分层迭代求解。仿真结果表明,提出的策略与已有的方案相比可以显著提高D2D链路的吞吐量。
[Abstract]:In a scenario where D2DDdevice-to-device) communication systems coexist with cellular networks, The introduction of relay nodes can effectively improve the throughput of D2D links and reduce the interference of D2D links to cellular networks. A novel half-duplex amplification and forwarding bidirectional relay assisted D2D communication scheme is presented. A corresponding optimal relay selection and power allocation algorithm is proposed. The algorithm can maximize the throughput of D2D links under the constraints of satisfying the interference of cellular systems less than a certain threshold. The algorithm optimizes the transmission of D2D links. The transmission power of the sending node; The relay node which can maximize D2D link throughput is selected as the optimal relay node. Using Lagrangian duality theory and the steepest descent method, the dual problem of the original power allocation optimization problem is solved by hierarchical iteration. The simulation results show that the proposed strategy can significantly improve the throughput of D2D link compared with the existing scheme.
【作者单位】：重庆电子工程职业学院;
【基金】：重庆市教委2013年度科学技术研究项目(KJ132206)~~
【分类号】：TN929.5

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