LTE系统中的分布式空时中继技术  

Distributed Space-Time Coding in LTE System

作　　者：卫国[1] 张超[1] 王磊[1] 

机构地区：[1]中国科学技术大学,无线网络通信安徽省重点实验室,安徽合肥230027

出　　处：《中兴通讯技术》2010年第1期18-22,共5页ZTE Technology Journal

基　　金：国家重点基础研究发展规划("973"计划)课题(2007CB310602)

摘　　要：中继技术作为LTE-Advanced系统的关键候选技术可为小区带来更大的覆盖范围和系统容量。分布式空时中继技术不仅可以充分利用中继技术带来的空间分集,又可以引入部分编码增益,是中继技术中最直接的应用技术。比较目前提出的分布式空时中继方案,得出基于解调-转发方式的空时中继编码方案最适合LTE-Advanced系统的方案。同时,针对解调-转发方式中存在的错误传递问题,提出基于门限的选择性空时中继方案,该方案以很小的系统复杂度换取了优异的性能增益。Relay is considered as one of the candidate key technologies for LTE-advanced system because it may enlarge cell coverage and enhance system capacity. Distributed Space-Time Coding （DSTC） not only exploits the spatial diversity from the relay structure, but also introduces partial coding gains. According to the performances of existing DSTC schemes, the Demodulate-and-Forward （DMF） scheme is the best candidate for DSTC in LTE-Advanced system. Moreover, a threshold-based selective relaying scheme for DSTC is proposed to solve the error propagation of DMF. This scheme can achieve excellent performance gains with very low system complexity.

关 键 词：长期演进 中继技术 分布式空时编码 解调转发 

分 类 号：TN929.5[电子电信—通信与信息系统]