基于OPNET的分集与复用性能研究

发布时间：2018-03-09 15:12

本文选题：多天线　切入点：空间分集　出处：《内蒙古大学》2017年硕士论文　论文类型：学位论文

【摘要】：多天线技术是通信技术发展的关键技术之一,LTE通信系统的多天线技术主要包括空间分集、空间复用和波束赋形技术。其中,空间分集和空间复用技术不仅能够很好地解决通信过程中的多径影响,还能够整体提升通信系统的性能。空间分集能够提供分集增益,在提高信号稳定性方面得到了广泛应用;而空间复用能够提供复用增益,从而充分利用频带资源。同时,在两种增益之间也存在一种折中关系。本文在理论基础上,利用软件OPNET18.0搭建仿真平台,主要针对LTE系统8种传输模式中的开环发射分集和开环空间复用技术进行研究。首先,对空间复用技术在单小区场景和多小区场景下的研究,通过信道利用率、时延和吞吐量等分析网络性能,验证了空间复用技术在提升系统吞吐量/频谱利用率方面的优势。其次,对用户处于小区边缘的情况下,通过对信噪比和丢包率等参数的分析,验证了空间分集技术在提升通信稳定性方面的优势。最后,根据空间分集与空间复用的技术特点,从网络层面分析和研究了空间分集和空间复用的折中问题,并通过仿真分析了多小区场景下的性能及其可行性。仿真结果表明:空间分集和空间复用在网络层面的折中,能够对整体的通信性能带来一定的提升。
[Abstract]:Multi-antenna technology is one of the key technologies in the development of communication technology. The multi-antenna technology of LTE communication system mainly includes spatial diversity, spatial multiplexing and beamforming. Spatial diversity and spatial multiplexing can not only solve the multipath influence in the communication process, but also improve the performance of the communication system as a whole. Spatial diversity can provide diversity gain and is widely used in improving the signal stability. Spatial multiplexing can provide the multiplexing gain and make full use of the frequency band resources. At the same time, there is a compromise relationship between the two gains. Based on the theory, this paper uses the software OPNET18.0 to build a simulation platform. This paper focuses on the open loop transmit diversity and open loop spatial multiplexing technology in 8 transmission modes of LTE system. Firstly, the research of spatial multiplexing technology in single cell scene and multi cell scenario is carried out through channel utilization. The analysis of network performance such as delay and throughput verifies the superiority of spatial multiplexing in improving the throughput / spectrum efficiency of the system. Secondly, when the user is on the edge of the cell, the SNR and packet loss rate are analyzed. The advantages of spatial diversity in improving communication stability are verified. Finally, according to the technical characteristics of spatial diversity and spatial multiplexing, the compromise between spatial diversity and spatial multiplexing is analyzed and studied from the network level. The simulation results show that the compromise between spatial diversity and spatial reuse in the network level can improve the overall communication performance.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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