面向5G的3D MIMO预编码和用户调度技术研究
发布时间：2019-05-11 18:06
【摘要】：随着系统带宽和数据速率的增加,移动网络的速率也飞速提升。无线移动通信正处于一个快速发展的时期,在不久的将来会进入5G时代。3D MIMO技术,通过充分利用空间资源,使基站能够更加有效地区分不同用户,提高系统性能,现已成为5G移动通信中的关键技术之一。本文首先介绍了MIMO的相关理论知识,简单分析了MIMO传输模型。并且着重对三种技术:单用户3D MIMO的预编码、单用户3D MIMO基于CSI-RS的预编码以及多用户调度技术进行了研究,全文具体工作如下:第一,研究3D MIMO系统下四种典型单用户预编码方案,分别是:基于点乘的预编码方案,基于等价信道的预编码方案,基于克罗内克积的预编码方案和基于信道转化的预编码方案。并且在URA天线阵列模型下,对四种预编码方案进行了仿真分析和比较,仿真显示,基于信道转化的预编码方案的系统性能较优于其他三种方案。第二,研究单用户下基于CSI-RS的预编码方案,由于大幅增加发射天线数目,但导频资源开销受限,可得的系统增益也会受到阻碍,这将对预编码方案的设计提出更高的要求,并且在现有的方法中,发射端往往在垂直方向提供一个数据流,没有有效地提高系统性能。为了解决上述问题,提出了两种基于CSI-RS的预编码方案。第三,研究多用户调度和正交码本联合设计方案,首先证明了3D MIMO系统下基于Kronecker码本的正交成立条件。为了充分利用码字间的正交性,提出了一种通过对DFT矩阵进行Fourier扰动的3D正交码本,对多用户系统下的不同用户之间的干扰有较强的抑制作用,并且本文提出了一种与之相适应的用户调度方案。仿真结果表明,本文提出的多用户调度和正交码本联合设计方案能获得更高的系统和速率。
[Abstract]:With the increase of system bandwidth and data rate, the rate of mobile network also increases rapidly. Wireless mobile communication is in a period of rapid development, and will enter the 5G era in the near future. 3D MIMO technology, by making full use of space resources, enables base stations to distinguish different users more effectively and improve system performance. Now it has become one of the key technologies in 5G mobile communication. In this paper, the theory of MIMO is introduced, and the transmission model of MIMO is simply analyzed. And focus on three technologies: single-user 3D MIMO precoding, single-user 3D MIMO precoding based on CSI-RS and multi-user scheduling technology. The specific work of this paper is as follows: first, Four typical single-user precoding schemes in 3D MIMO system are studied, which are: precoding scheme based on point multiplication, precoding scheme based on equivalent channel, precoding scheme based on Cronecker product and precoding scheme based on channel transformation. Under the URA antenna array model, the simulation analysis and comparison of the four precoding schemes are carried out. The simulation results show that the system performance of the precoding scheme based on channel conversion is better than that of the other three schemes. Secondly, the precoding scheme based on CSI-RS in single user is studied. Due to the large increase of the number of transmit antennas, but the limited overhead of pilot resources, the available system gain will also be hindered, which will put forward higher requirements for the design of precoding scheme. And in the existing methods, the transmitter often provides a data stream in the vertical direction, which does not effectively improve the system performance. In order to solve the above problems, two precoding schemes based on CSI-RS are proposed. Thirdly, the joint design scheme of multi-user scheduling and orthogonal codebook is studied. firstly, the orthogonal establishment condition based on Kronecker codebook in 3D MIMO system is proved. In order to make full use of the orthogonality between code words, a 3D orthogonal codebook perturbed by Fourier on DFT matrix is proposed, which has a strong suppression effect on the interference between different users in multi-user system. And a corresponding user scheduling scheme is proposed in this paper. The simulation results show that the proposed joint design scheme of multi-user scheduling and orthogonal codebook can obtain higher system and rate.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3;TN929.5
本文编号：2474725
[Abstract]:With the increase of system bandwidth and data rate, the rate of mobile network also increases rapidly. Wireless mobile communication is in a period of rapid development, and will enter the 5G era in the near future. 3D MIMO technology, by making full use of space resources, enables base stations to distinguish different users more effectively and improve system performance. Now it has become one of the key technologies in 5G mobile communication. In this paper, the theory of MIMO is introduced, and the transmission model of MIMO is simply analyzed. And focus on three technologies: single-user 3D MIMO precoding, single-user 3D MIMO precoding based on CSI-RS and multi-user scheduling technology. The specific work of this paper is as follows: first, Four typical single-user precoding schemes in 3D MIMO system are studied, which are: precoding scheme based on point multiplication, precoding scheme based on equivalent channel, precoding scheme based on Cronecker product and precoding scheme based on channel transformation. Under the URA antenna array model, the simulation analysis and comparison of the four precoding schemes are carried out. The simulation results show that the system performance of the precoding scheme based on channel conversion is better than that of the other three schemes. Secondly, the precoding scheme based on CSI-RS in single user is studied. Due to the large increase of the number of transmit antennas, but the limited overhead of pilot resources, the available system gain will also be hindered, which will put forward higher requirements for the design of precoding scheme. And in the existing methods, the transmitter often provides a data stream in the vertical direction, which does not effectively improve the system performance. In order to solve the above problems, two precoding schemes based on CSI-RS are proposed. Thirdly, the joint design scheme of multi-user scheduling and orthogonal codebook is studied. firstly, the orthogonal establishment condition based on Kronecker codebook in 3D MIMO system is proved. In order to make full use of the orthogonality between code words, a 3D orthogonal codebook perturbed by Fourier on DFT matrix is proposed, which has a strong suppression effect on the interference between different users in multi-user system. And a corresponding user scheduling scheme is proposed in this paper. The simulation results show that the proposed joint design scheme of multi-user scheduling and orthogonal codebook can obtain higher system and rate.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3;TN929.5
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