多点协作传输的信道估计  

Channel estimation for coordinated multi-point transmissions

作　　者：杨海斌[1] 张秀军[1] 周春晖[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技术国家重点实验室清华信息科学与技术国家实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2013年第7期977-981,990,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家科技重大专项课题(2012ZX03001017-002);国家“九七三”重点基础研究项目(2012CB316000);国家自然科学基金创新研究群体项目(61021001);科技部国际合作项目(2012DFG12010)

摘　　要：多点协作可以有效地提高系统频谱效率,但由于参与协作的不同基站到用户的传输信道不同,导致用户经历的等效信道多径个数增多且多径时延扩大,而且每个用户只占用部分子带,子带内参考信号数量很少,从而增加了信道估计尤其是信道插值的难度。为此该文提出用户端利用子带内少量参考信号估计平均传输时延,并以此为基础进行信道插值,从而估计多点协作等效信道的方法。仿真结果表明:该方法可以有效地估计出等效信道的平均时延,并显著地提高信道估计的准确性。Coordinated multi-point （CoMP） transmission have been proposed as a promising approach to increase the spectral efficiency of normal transmissions. However, when transmissions from cooperative base stations to a user equipment （UE） are transmitted over different channels, the UE will experience more channel paths and larger equivalent multi-path delays, with only a few reference signals in the sub-band assigned to each UE, so the system can not estimate the UE-speeific channels. This paper describes an algorithm to estimate the mean delay based on the reference signals of the assigned sub-band. The estimation is then used to interpolate of the UE-specific channel estimation. Tests show that the algorithm can effectively estimate the mean delay and performs well in channel estimation.

关 键 词：多点协作 信道估计 用户特定参考信号 

分 类 号：TN929.53[电子电信—通信与信息系统]