莱斯信道下大规模MIMO系统传输速率研究

发布时间：2018-01-21 21:41

  本文关键词： 大规模MIMO 莱斯信道 视距分量 可达速率 功率缩减　出处：《大连海事大学》2017年硕士论文　论文类型：学位论文

【摘要】：传统小规模多输入多输出(MIMO)无线通信技术已日趋成熟,但其在频谱效率、能量效率和可靠性等方面仍存在局限性。因此,2010年Marzetta提出了大规模MIMO技术,该技术通过显著增加基站天线数,以深度挖掘空间维度无线资源,改善小规模MIMO性能的局限性,提高系统容量。由于大规模MIMO具有能够减小用户发送功率有效提升系统性能等多方面的优势,目前已成为5G移动通信最具挑战也是最具潜力的研究方向之一。然而这项技术在很多方面都处于起步阶段,尤其是在莱斯信道模型下系统性能分析与方案设计方面。本文首先对多用户莱斯衰落信道上行系统性能进行了分析。对于系统具有非完美信道状态信息(CSI)和完美CSI两种情况,在接收端使用MRC和ZF两种线性检测技术进行检测下,详细分析了其可达速率和功率缩减特性,并进行仿真比较。仿真结果表明,不论是在完美CSI下还是非完美CSI下,在不减小速率性能的同时每个用户的发送功率最多可被缩减为原来的1/M,这里M为基站天线数。随着莱斯因子的增加,除了完美CSI下ZF检测技术的可达速率逐渐减小且趋于一个定值,其他情况下可达速率先是逐渐增大最后趋于一个定值。为了避免导频污染,本文之后提出基于视距分量(LOS)的系统方案,并对其速率性能进行了分析。特别在等增益合并检测技术下,并分析了新方案的功率缩减特性,发现每个用户的发送功率最多也可被缩减为原来的1/M。接着又推广到中继系统,首先给出了单对双向放大转发系统方案及其可达速率表达式并导出了三种功率收缩律下的速率上界表达式,然后延伸到多对系统中。接着对理论结果进行仿真分析。结果表明,分别随着中继端天线数、莱斯因子和用户发送功率的增加,三种功率收缩情况下的可达速率最后会趋于一个稳定的值。当M → ∞时,在保证可达速率的同时,用户的发送功率也可以被缩减为原来的1/M,或者中继端功率被缩减为原来的1/M。
[Abstract]:Traditional small scale MIMO (Multi-Input-Multiple-Output) wireless communication technology has become more and more mature, but its spectral efficiency, energy efficiency and reliability are still limited. In 2010, Marzetta proposed the large-scale MIMO technology, which can mine the wireless resources of spatial dimension by increasing the number of base station antennas significantly. To improve the performance of small-scale MIMO, improve the system capacity. Because of the large-scale MIMO can reduce the user transmission power and improve the system performance and other advantages. At present, it has become one of the most challenging and potential research directions for 5G mobile communication. However, this technology is still in its infancy in many aspects. Especially in the aspect of system performance analysis and scheme design under Rice channel model. Firstly, the performance of uplink system in multi-user Rice fading channel is analyzed. CSI) and perfect CSI. In the receiver using MRC and ZF two linear detection techniques to detect, the reachable rate and power reduction characteristics are analyzed in detail, and the simulation results show that. Whether in perfect CSI or imperfect CSI, the transmission power of each user can be reduced to up to 1 / M of the original without reducing the rate performance. M is the number of base station antennas. With the increase of Rice factor, the reachable rate of ZF detection technology under perfect CSI gradually decreases and tends to a fixed value. In other cases, the reachable rate increases gradually and then tends to a fixed value. In order to avoid pilot pollution, this paper proposes a system scheme based on LOS (line-of-sight component). The rate performance is analyzed, especially in the equal gain combination detection technology, and the power reduction characteristics of the new scheme are analyzed. It is found that the transmission power of each user can also be reduced to 1 / 1 / M of the original, which is then extended to the relay system. Firstly, the scheme of single-pair bidirectional amplification and forward transmission system and its reachable rate expression are given, and the rate upper bound expressions under three kinds of power contraction laws are derived. Then it is extended to the multi-pair system. Then the theoretical results are simulated and analyzed. The results show that with the increase of the antenna number of relay terminals, the Rice factor and the transmission power of the user, respectively. The reachability rate of three kinds of power shrinkage will eventually tend to a stable value. 鈫扐t 鈭，

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