一种基于Gold码的分布式MIMO-CDMA系统的下行同步方案  

A downlink synchronization scheme for distributed MIMO-CDMA systems based on gold sequence

作　　者：钟明华[1] 李立华[1] 刘培植[1] 张平[1] 王朝炜[1] 

机构地区：[1]北京邮电大学泛网无线通信教育部重点实验室,北京100876

出　　处：《高技术通讯》2009年第5期466-470,共5页Chinese High Technology Letters

基　　金：863计划(2007AA01Z261);国家自然科学基金(60702051);高等学校博士学科点专项科研基金(20070013028);新世纪优秀人才支持计划(NCET-08-0735)资助项目

摘　　要：针对下一代通信系统核心点之一的分布式MIMO架构,提出了一种新型双级地址码分配方案及相应同步过程。此方案以现有CDMA同步技术为基础,可以实现从现有集中式单天线向分布式多天线的平滑过渡;同时针对基站下多天线阵分布布局,采用双级地址码结构实现对基站和基站下各天线的逐级同步。以一对优选PN码为基础设计分配基站地址和基站下各天线阵地址,同时具备低实现复杂度和高同步速率。基于PN码部分相关性的固定相关码长FFS算法仿真表明,此新型同步方案能够实现分布式MIMO的高效同步检测。A layered-access-code allocation and corresponding synchronization scheme is proposed for distributed multi-input multi-output code division multiple access （MIMO-CDMA） systems. The distributed MIMO is considered to be one of the key technologies of next generation mobile communications. Based on the synchronization technology of CDMA systems, the proposed scheme can facilitate the transition from centralized single-antennas to distributed multi-antennas. And in consideration of the distributed layout of base stations and multi-antenna arrays, the scheme can implement the synchronization of base stations and their antennas step by step utilizing the proposed layered-access-codes. The allocation of access-codes for base stations and their antennas is based on one preferred pair of m sequence, and it can make the synchronization process faster with lower complexity. The results of the simulation with the fixed sample size （FFS） algorithm, based on the partial correlation of pseudo noise （PN） codes, indicate that the proposed scheme can achieve that the synchronization detection of distributed MIMO systems efficiently.

关 键 词：分布式MIMO 码分多址(CDMA) 分层地址码 天线同步 

分 类 号：TN929.533[电子电信—通信与信息系统] V241.62[电子电信—信息与通信工程]