Massive MIMO收发技术联合设计研究

发布时间：2018-06-24 00:53

本文选题：Massive + MIMO　；参考：《北京邮电大学》2015年硕士论文

【摘要】：为满足下一代移动通信系统对传输速率及频谱效率更高的需求,Massive MIMO技术作为第五代移动通信关键技术受到了广泛的关注。Massive MIMO技术即在传统MIMO技术的收发两端配置更多的天线数目,利用天线数目的优势,在相同的时频资源上同时服务多个用户,以获得更高的空间服用增益、频谱效率及系统鲁棒性。本论文主要针对多用户Massive MIMO场景下的收发技术方案进行了研究。在已有的Massive MIMO系统的研究通常采用TDD双工模式,利用信道互易性降低CSI获取的资源消耗量,然而对于FDD双工模式研究的较少,主要原因在于随着发射端天线数目的增加,FDD系统中需要更多的CSI,而系统中利用导频辅助的CSI获取方式将消耗大量的系统资源。基于以上背景,本论文针对多用户Massive MIMO系统FDD双工模式下的应用问题,通过研究分析Massive MIMO系统中的收发技术及空间相关性,提出了一种基于空间相关性的Massive MIMO下行分组传输方案。本论文所提出的下行分组传输方案,主要思想是利用相似的空间相关性对用户进行分组,然后在每一组内进行用户调度及多用户预编码。该方案采用两阶段预编码策略,第一阶段为预处理,利用系统信道二阶统计信息进行矩阵设计；第二阶段为多用户预编码,利用经过预处理的等效信道矩阵进行设计。通过在传统多用户预编码之间串联预处理矩阵,可以有效地降低等效信道矩阵的维度,减少系统传输所必须的CSI。此外,当天线数目有限时,需要对不同用户组中用户进行调度,本论文还提出了一种联合随机波束赋形及半正交化用户调度的用户选择方案。最后本论文利用Matlab软件进行了方案性能分析,性能分析验证了本下行分组传输方案,在系统容量损失较小的情况下,极大地降低了系统传输所需的信息反馈量。
[Abstract]:In order to meet the demand of the next generation mobile communication system for higher transmission rate and higher spectral efficiency, passive MIMO technology, as the key technology of the fifth generation mobile communication, has received extensive attention. The passive MIMO technology is configured at both ends of the traditional MIMO technology. More antennas, Taking advantage of the number of antennas, multiple users are simultaneously served on the same time-frequency resources to achieve higher spatial access gain, spectral efficiency and system robustness. In this thesis, the transceiver scheme of multi-user passive MIMO scene is studied. In existing passive MIMO systems, TDD duplex mode is usually used to reduce the resource consumption obtained by CSI by using channel reciprocity. However, the FDD duplex mode is seldom studied. The main reason is that more CSI is needed in the FDD system with the increase of the number of antennas at the transmitter, and a large amount of system resources will be consumed by the pilot-assisted CSI acquisition method in the system. Based on the above background, this thesis aims at the application of FDD duplex mode in multi-user passive MIMO system, and analyzes the transceiver technology and spatial correlation of passive MIMO system. A scheme of passive MIMO downlink packet transmission based on spatial correlation is proposed. The main idea of the downlink packet transmission scheme proposed in this paper is to use similar spatial correlation to group users and then to schedule users and precode users in each group. The scheme adopts two-stage precoding strategy, the first stage is pre-processing, the second stage is multi-user pre-coding, and the second stage is multi-user pre-coding, using the pre-processed equivalent channel matrix to design the matrix. The dimension of the equivalent channel matrix can be effectively reduced and the CSIs necessary for the transmission of the system can be reduced by using the series preprocessing matrix between the traditional multi-user precoding systems. In addition, when the number of antennas is limited, users in different user groups need to be scheduled. In this paper, a user selection scheme for joint random beamforming and semi-orthogonal user scheduling is proposed. Finally, the performance analysis of the scheme is carried out by using Matlab software. The performance analysis verifies the scheme of downlink packet transmission, which greatly reduces the amount of information feedback needed by the system when the capacity loss of the system is small.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN919.3

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