通信工程文献翻译——摘要

多跳D2D的通信可以显着提高系统的性能。本文研究了 D2D通信由另一个 D2D用户使用三个时隙双向放大和转发中继协议在瑞利衰落信道的中断性能。考虑同信道干扰蜂窝用户在 D2D节点辅助的中断性能，给出了整体的中断概率的近似表达式。此外，功率分配的最佳方法，以尽量减少中断概率的开发，并推导出的最佳功率分配系数在继电器的封闭形式的表达式。仿真结果表明，派生的中断概率表达式的准确性。仿真结果还表明，中断性能可以提高使用所提出的最优功率分配方法。

关键词：D2D通信;中断概率性;功率分配;放大转发协议

1.介绍

随着越来越多的新的移动多媒体服务成为可能，未来的应用在高数据速率和频谱效率有一个不断增长的需求[1-2 ]，然而，拥挤的频谱已经抑制了无线通信的进一步增长。应对移动宽带数据流量的指数级增长和提高本地服务的灵活性，开发的 D2D通信被看作是增加频谱效率的一种很潜力的技术，卸载移动通信，提高蜂窝覆盖，并降低功耗的用户设备[3-6]。

本文研究了中断 D2D通信与其他 D2D用户使用三个时隙双向放大和转发中继协议在瑞利衰落信道辅助性能。考虑到信道在 D2D节点到蜂窝用户间干扰。推导出整体的中断概率的近似表达式。

D2D 通信使两邻近用户设备信息（UEs）传输信号直接由传统的蜂窝基站（BSs）无线资源复用控制。一般情况下，D2D 用户设备费（DUEs）可以利用正交无线电资源或使用全光谱与蜂窝利用的线索（CUEs），分别在文献[ 6 ]中给出。覆盖的情况下，可以限制 D2D传输的干扰，但导致资源利用率低的资源，特别对于大系统带宽的高级 LTE-A网络部署更为适用。由于无线资源的稀缺性，底层的情况是适合未来移动通信系统，如 LET-A 网络[6,7]。

最近，D2D下蜂窝网络已由第三代合作伙伴计划（3GPP）标准[ 8 ]。与电子标准化......

Abstract: Multi-hop device-to-device (D2D) communication can significantly improve the system performance. This paper studied the outage performance of D2D communication assisted by another D2D user using three-timeslot two-way amplify-and-forward relaying protocol over Rayleigh fading channels. 

Considering the co-channel interference from cellular user at the D2D node, the approximate expression for the overall outage probability was derived. Furthermore, a power allocation optimum method to minimize the outage probability was developed, and the closed form expression for the optimal power allocation coefficient at the relay was derived. Simulation results demonstrate accuracy of the derived outage probability expressions. Simulation results also demonstrate that the outage performance can be improved using the proposed optimal power allocation method. 

Keywords: D2D communication; outage probability; power allocation; amplify-and-forward relaying protocol

I. INTRODUCTION

As more and more new mobile multi-media services are becoming available, there is an increasing demand for future applications on high data rate and spectral efficiency[1-2]. However, the crowded spectrum has already inhibited the further growth of wireless communication. To cope with the exponential growth of mobile broadband data traffi c and improve local service flexibility, D2D communication has been proposed as a promising technology due to the......