同频无线回传小基站系统中的协作传输优化  

Cooperative transmission optimization for inband wireless-backhauled small cell systems

作　　者：徐霄飞[1] 肖立民[1] 赵明[1] 粟欣[1] 许希斌[1] 王京[1] 

机构地区：[1]清华大学电子工程系,微波与数字通信国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2014年第12期1604-1608,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(2012CB316000);国家"八六三"高技术项目(2014AA01A703);国家自然科学基金重点项目(61201192);国家科技重大专项项目(2015ZX03001023-002);教育部科学研究重大项目(313005);清华自主科研项目(2011THZ02-2);东南大学移动通信国家重点实验室开放研究基金(2012D02)

摘　　要：全双工的同频无线回传小基站可应用于阴影衰落严重区域的覆盖。在密集部署场景下,自干扰和小区间干扰严重影响系统传输性能。该文提出了一种基于集中式处理的同频无线回传小基站系统方案,采用空域和时域处理联合实现自干扰抑制和协作传输,并设计了一种基于连续凸近似和半正定松弛的迭代算法,对前向链路和回传链路上的波束成形/预编码及功率分配进行优化,从而降低系统发送功率。针对天线收发可切换的系统提出了一种复合算法,能够对收发天线进行高效选择。仿真结果表明:该方案能够有效抑制自干扰和小区间干扰,减小系统发送功率。Full-duplex in-band wireless-backhauled small cells can provide coverage in areas suffering from deep shadow fading.Self interference and intercell interference severely degrade overall performance when such systems are very dense. A in-band wireless-backhauled small cell system design is given that features centralized processing. This design combines space-domain and time-domain techniques to mitigate self interference and improve cooperative transmissions. An efficient algorithm based on successive convex approximation and semi-definite relaxation is used to optimize the beamformer/precoder and the power allocation on the fronthaul and backhaul. A composite algorithm incorporating transmit/receive antenna selection is also given for systems with configurable antennas.Simulations show that this scheme efficiently suppresses self interference and intercell interference,resulting in lower transmission power.

关 键 词：移动通信 小基站系统 同频无线回传 协作传输 自干扰 

分 类 号：TN929.5[电子电信—通信与信息系统]