基于链路自适应的D2D系统跨层优化的研究  

A link-adaptive cross-layer optimization scheme for D2D systems

作　　者：赵夙[1] 安然 邵世祥[3] 

机构地区：[1]南京邮电大学宽带无线通信与传感网技术教育部重点实验室,江苏南京210003 [2]上海航天电子技术研究所,上海201109 [3]南京邮电大学江苏省无线通信重点实验室,江苏南京210003

出　　处：《光通信研究》2014年第2期51-54,58,共5页Study on Optical Communications

基　　金：江苏省高校优势学科建设工程资助项目"信息与通信工程"(YX002001);国家重大专项资助项目(2012ZX03003011-005);国家"九七三"计划资助项目(2013CB329104)

摘　　要：D2D(终端直通)技术以非正交复用资源的方式引入LTE(长期演进)系统会带来干扰问题,即导致系统中蜂窝用户和D2D用户间存在互相干扰。在D2D系统中,跨层的资源优化能应对蜂窝用户因干扰影响瞬时变差的信道情况,从而提高蜂窝用户的平均频谱效率,提高系统容量。文章研究了基于链路自适应的跨层优化方案,并结合了物理层的自适应调制编码技术和数据链路层的自动选择重传技术,旨在降低D2D技术引入的干扰。仿真结果表明,在4个蜂窝用户、4对D2D用户的单小区场景中,采用基于链路自适应的跨层优化方案后,D2D通信系统的总容量提升了约5%。The introduction of Device-to-Device （D2D）technology into the LTE systems in a non-orthogonal way of reusing re-sources may bring about interferences,i.e.mutual interferences between the cellular users and the D2D users.In the D2D sys-tems,cross-layer resource optimization can cope with instantaneous channel worsening arising from the interferences for the cellular users,thus improving their average spectral efficiency and increasing the system capacity.This thesis studies a link-a-daptive cross-layer optimization scheme for the D2D system,which combines the adaptive modulation and coding technology in the physical layer with the auto repeat request technology in the data link layer,aiming at lowering the interferences arising from the introduction of the D2D technology.Simulation results indicate that in a single cell scenario with 4 cellular users and 4 pair of D2D users,the total capacity of the D2D communication system is increased by about 5% when the link-adaptive cross-layer optimization scheme is adopted.

关 键 词：终端直通技术 跨层优化 链路自适应技术 

分 类 号：TN929.5[电子电信—通信与信息系统]