空间相关信道下异构多用户MIMO跨层设计性能研究

发布时间：2018-04-27 05:29

  本文选题：MIMO + 跨层设计　； 参考：《南京航空航天大学》2014年硕士论文

【摘要】：多输入多输出(MIMO)技术能够在不增加带宽的条件下极大地提高链路健壮性、系统容量和频谱效率,因而得到广泛的关注。与单用户MIMO相比,多用户MIMO能够充分利用多用户分集增益和复用增益,进一步提高整个系统的频谱利用率和可靠性。跨层设计(CLD)通过网络各层间交互信息进行统一协调,从而实现网络资源的合理有效分配。因此,针对MIMO系统提出了联合物理层自适应调制(AM)和数据链路层自动重传请求(ARQ)的多用户跨层设计方案。本文针对实际场景中用户的统计特性是独立非同分布的,以及发送端天线存在空间相关性,研究空间相关信道下异构多用户MIMO基于不完全信道估计的跨层设计性能,为提高跨层设计的实用性提供必要的理论依据。全文的主要工作安排如下:1、研究异构多用户MIMO系统基于公平调度的跨层设计。在实际的通信中,用户的信噪比的统计特性是独立非同分布的,传统的调度策略不能保证用户间的公平性,为此提出一种联合发送天线选择、自适应调制、自动重传请求及比例公平调度的多用户MIMO跨层设计方案。该方案可以在保证小区内所有用户被公平调度的前提下,充分利用多用户分集提高系统性能。2、研究空间相关信道下异构多用户MIMO系统跨层设计。在实际的无线通信环境中,由于发射机天线尺寸的限制或散射体不够丰富等原因,MIMO无线信道不再相互独立,而是存在着空间相关性。基于此,提出一种空间相关信道下异构多用户MIMO跨层设计方案,并对系统性能进行了分析,仿真结果验证了理论分析的正确性。3、研究基于不完信道估计信息的异构多用户MIMO系统跨层设计。针对信息反馈链路的不稳定或者接收端信道有估计错误等因素,接收端获得的信息是不完全的,提出研究信道估计错误对跨层设计系统性能的影响,并推导了系统平均频谱效率(ASE)和平均误包率(PER),为提高跨层设计的实用性提供理论依据。
[Abstract]:Multi-Input-Multiple-Output (MIMO) technology can greatly improve link robustness, system capacity and spectral efficiency without increasing bandwidth, so it has attracted wide attention. Compared with single user MIMO, multiuser MIMO can make full use of multiuser diversity gain and multiplexing gain, and further improve the spectrum efficiency and reliability of the whole system. Cross-layer design (CLD) coordinates the interactive information among different layers of the network to realize the rational and effective allocation of network resources. Therefore, a multi-user cross-layer design scheme for MIMO systems is proposed, which is based on the combination of physical layer adaptive modulation (AM) and data link layer automatic retransmission request (ARQ). In this paper, the cross-layer design performance of heterogeneous multi-user MIMO based on incomplete channel estimation is studied in view of the fact that the statistical characteristics of users are independent and heterogeneous, and the antenna at the transmitter has spatial correlation. It provides the necessary theoretical basis for improving the practicability of cross-layer design. The main work of this paper is as follows: 1. The cross-layer design of heterogeneous multi-user MIMO systems based on fair scheduling is studied. In practical communication, the statistical characteristics of the signal-to-noise ratio (SNR) of users are independent and heterogeneous, and the traditional scheduling strategy can not guarantee the fairness between users. Therefore, a joint transmit antenna selection, adaptive modulation, is proposed. Multi-user MIMO cross-layer design for automatic retransmission request and proportional fair scheduling. This scheme can make full use of multi-user diversity to improve the performance of the system, and study the cross-layer design of heterogeneous multi-user MIMO system in spatially correlated channels on the premise that all users in the cell are fairly scheduled. In the actual wireless communication environment, due to the limitation of transmitter antenna size or the lack of abundant scatterers, MIMO wireless channels are no longer independent of each other, but have spatial correlation. Based on this, a cross-layer design scheme of heterogeneous multi-user MIMO in spatial correlation channel is proposed, and the performance of the system is analyzed. The simulation results verify the correctness of the theoretical analysis. The cross-layer design of heterogeneous multi-user MIMO systems based on channel estimation information is studied. Considering the instability of the information feedback link or the error in the channel estimation of the receiver, the information obtained by the receiver is incomplete. This paper studies the influence of the channel estimation error on the performance of the cross-layer design system. The system average spectral efficiency (ASE) and the average packet error rate (per) are derived, which provides a theoretical basis for improving the practicability of cross-layer design.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3
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本文编号：1809408