论文部分内容阅读
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。
Multi-point cooperation can effectively improve the system spectrum efficiency. However, due to different transmission channels from different base stations to users participating in the collaboration, the number of equivalent channel multipaths experienced by users increases and the multipath delay increases, and each user occupies only The number of sub-bands and sub-band reference signals is very small, which increases the difficulty of channel estimation, especially channel interpolation. Therefore, this paper proposes a method for the UE to estimate the average transmission delay using a small number of reference signals in a sub-band and to perform channel interpolation on the basis of this to estimate the coordinated multi-point channel. The simulation results show that this method can effectively estimate the average delay of equivalent channels and improve the accuracy of channel estimation significantly.