基于大规模天线的多用户MISO下行链路频谱效率分析

发布时间：2018-01-07 00:37

本文关键词：基于大规模天线的多用户MISO下行链路频谱效率分析　出处：《通信学报》2014年02期 　论文类型：期刊论文

【摘要】：在大规模天线时分双工通信系统中,分析了多用户MISO下行链路的频谱效率。假定用户数固定且基站天线数M无限增大,通过理论推导分析发现,当基站发送功率减小到单天线基站的1/M时,随着M的增加系统频谱效率趋于一个恒值;并且简单的预处理即可消除用户间干扰和快衰落的影响。虽然多小区系统会受导频污染的影响,致使小区间干扰不能被完全消除,但是降低后的发送功率可使系统由干扰受限转变为噪声受限。采用迫零单位预编码与采用最大比发送单位预编码的系统频谱效率极限表达式相同。最后给出采用空时分组码的多用户下行链路的频谱效率下限值,并通过仿真分析证实了以上结论的正确性。
[Abstract]:In large scale antenna time division duplex communication system, the spectrum efficiency of multiuser MISO downlink is analyzed. Assuming that the number of users is fixed and the number of base station antenna M is infinite, it is found by theoretical deduction and analysis. When the transmission power of the base station is reduced to 1 / M of that of the single antenna base station, the spectral efficiency of the system tends to a constant value with the increase of M; And simple preprocessing can eliminate the impact of inter-user interference and fast fading. Although the multi-cell system will be affected by pilot pollution, the inter-cell interference can not be completely eliminated. However, the reduced transmission power can change the system from interference limitation to noise limitation. The zero-forcing unit precoding is the same as the system spectrum efficiency limit expression using maximum ratio transmission unit precoding. A lower limit of spectrum efficiency for a multiuser downlink of a space-time block code. The correctness of the above conclusions is verified by simulation analysis.
【作者单位】：华侨大学信息科学与工程学院;东南大学信息科学与工程学院;
【基金】：国家自然科学基金资助项目(61372101,61271018,61201171,61071113) 中央高校基本科研业务费专项基金资助项目(JB-ZR1205) 福建省科技创新平台建设基金资助项目(2012H2002) 华侨大学高层次人才科研启动费基金资助项目(11BS112)~~
【分类号】：TN929.5
【正文快照】： 1引言多天线技术又称多输入多输出(MIMO)技术,因其在提高频谱效率和链路可靠性上存在巨大潜能而备受关注。文献[1,2]给出了单用户多输入多输出(SU-MIMO)系统的频谱效率分析,发现系统频谱效率随着收发天线数中较小的那个数呈线性增长。然而在实际系统中,由于天线间的相关性及周

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