MIMO系统中的NOMA技术研究

RESEARCH ON NOMA TECHNOLOGY IN MIMO SYSTEM

杨丽园

11649128

硕士

信息与通信工程

王锐

2018-06-05

2018-07-06

哈尔滨工业大学

深圳

本文主要对非正交多址接入技术（Non-Orthogonal Multiple Access NOMA展开了研究 利用 软件无线电设备（ Universal Software Radio Peripheral USRP和软件平台（ Laboratory Virtual Instrument Engineering Workbench LabVIEW）搭建了实测平台，并对典型的 NOMA技术进行了验证与实测并在此基础上提出了新的与多天线（ Multiple Input Multiple Output MIMO）技术相结合的 NOMA方案。本论文主要包含以下四个部分内容 。首先，介绍了NOMA技术的原理，以典型的两用户下行链路通信系统为例对NOMA技术进行了详细的阐述。接收端接收算法的研究是 NOMA的研究重点。本文对 NOMA技术接收端经典的串行干扰消除（ Successive Interference Cancellation SIC）算法进行了详细的介绍，同时，又介绍了可以弥补 SIC不足的联合检测（ Joint Detection JD）算法。与 MIMO技术相结合也是 NOMA技术的研究重点之一。因此，本文对 MIMO技术进行了介绍，并重点介绍了 MIMO的正交空时编码技术 ——Alamouti算法 。然后，对典型的两用户上行链路 NOMA系统用基于 USRP的软件无线电平台进行了实测。通过对 NOMA系统接收端分别采用 SIC和 JD-SIC两种干扰消除算法实测到的误码率性能进行分析，得出将联合检测与串行干扰消除相结合的 JD-SIC算法具有较好的误码率性能的结论。接着，在 JD-SIC算法的基础上，提出了一种 MIMO系统上行链路 与 Alamouti算法相结合 的 NOMA技术方案，并通过软件无线电实测平台进行了验证。同时，针对该方案实测过程中出现的问题，提出了一种新的帧结构设计。新的帧结构使接收端 用 SIC方法进行中心用户信息检测时，通过第二段导频对信道进行重新估计，保证了信道估计的准确性与实时性，并通过实测证明新的帧结构的设计可以明显提升系统的误码率性能。最后，针对现有方案根据远近用户信道相似进行 NOMA存在的不足，提出了一种与干扰对齐消除技术相结合的 MIMO系统中下行 NOMA传输方法。并对提出的方案进行了仿真验证，从误码率和系统总的实际吞吐量性能方面与现有方案进行了分析与比较 。

This paper mainly talked about the technology of Non-Orthogonal Multiple Access and implemented the classical NOMA system based on the testbed consisting of Universal Software Radio Peripheral and Laboratory Virtual Instrument Engineering Workbench. And a new scheme which is the combination of MIMO and NOMA was also proposed. The following four parts are mainly talking about in the paper.Firstly, the concept of NOMA was introduced, and the explanation was given in detail by the example of two user downlink NOMA communication system. Researching on the receiving scheme is very important for NOMA system. This paper introduced the Successive Interference Cancellation scheme and the Joint Detection scheme which can improve the advantages of the SIC. Combination with MIMO is also one of the significant researches. Therefore, the paper also introduced the MIMO technology, especially the Alamouti scheme.Then, the typical two user NOMA uplink system based on the USRP and LabVIEW testbed was implemented. By analyzing the BER of the SIC and JD-SIC, the performance JD-SIC was found outperformed the conventional SIC scheme.Later, based on the JD-SIC scheme, a new uplink MIMO-NOMA scheme which is the combination of NOMA and Alamouti was shown in detail. And it was proved by the USRP and LabVIEW testbed. While for the problem rose during the testing, a novel frame of physical layer was proposed, and it got a better performance.Finally, a new downlink MIMO-NOMA scheme based on the interference alignment and cancellation was proposed which can improve the shortcoming that according to the similar of the channel gain between edge users and center users. And the BER and throughput performance of the scheme was proved by simulating using MATLAB.

MIMO NOMA 干扰消除 USRP LabVIEW

NOMA USRP MIMO Interference Cancellation LabVIEW

中文

联合培养

南方科技大学

杨丽园. MIMO系统中的NOMA技术研究[D]. 深圳. 哈尔滨工业大学,2018.