面向5G移动通信系统的MIMO-SCMA技术仿真研究

发布时间：2018-04-09 14:52

本文选题：5G　切入点：SCMA　出处：《西南交通大学》2017年硕士论文

【摘要】：全球移动通信的发展已步入5G研究时代,4G最高的传输速率可以达到100Mbps,而第五代移动通信需要满足人们对更高速率的要求。同时,第五代移动通信网络在信息传输过程当中还应该展现出短时延、低功耗、高可靠的特点。在当前的5G研究领域中,非正交多址接入已成为物理层关键技术,其中华为公司提出的稀疏编码多址(SCMA)技术实现了频域的非正交复用,从而有效提升了频带利用率。另一方面,多输入多输出(MIMO)技术能够在不增加频谱资源前提下有效提升系统容量。本论文主要针对5G移动通信系统,通过仿真对SCMA技术及其与MIMO技术的结合展开研究。论文首先简要介绍了SCMA的系统模型与工作原理,通过系统级仿真对SCMA和OFDMA技术进行了性能对比,发现SCMA作为下一代无线通信的空口技术,在吞吐量性能上明显优于OFDMA。在此基础上,论文针对下行SCMA系统,采用不同调度算法进行仿真,分析了SCMA系统调度公平性与吞吐量之间的折中。论文进一步地仿真了基于空时编码的下行链路MIMO-SCMA系统,将多天线SCMA与单天线SCMA进行误码性能对比,发现MIMO分集技术与SCMA技术结合大大提升了下行链路的误码性能。此外,文章还研究了不同MIMO接收检测技术和不同信道模型对接收端误码性能的影响。结果表明基于MIMO的SCMA技术,不仅能够有效提升频谱利用率,同时还具有更高可靠性,因而具有较好应用前景。
[Abstract]:The development of global mobile communication has entered the era of 5G research, the highest transmission rate of 4G can reach 100 Mbpss, and the fifth generation mobile communication needs to meet the demand of higher speed.At the same time, the fifth generation mobile communication network should have the characteristics of short time delay, low power consumption and high reliability in the process of information transmission.In the current 5G research field, non-orthogonal multiple access (NOAA) has become the key technology in physical layer. The sparse coded multiple access (SCMA) technology proposed by Huawei has realized non-orthogonal multiplexing in frequency domain, thus effectively improving the frequency band efficiency.On the other hand, multiple input multiple output (MIMO) technology can effectively enhance the system capacity without increasing spectrum resources.In this paper, SCMA technology and its combination with MIMO technology are studied by simulation for 5G mobile communication system.Firstly, this paper briefly introduces the system model and working principle of SCMA, and compares the performance of SCMA and OFDMA through system-level simulation. It is found that SCMA, as the empty port technology of next generation wireless communication, is obviously superior to OFDMA in throughput performance.On this basis, different scheduling algorithms are used to simulate the downlink SCMA system, and the trade-off between scheduling fairness and throughput of SCMA system is analyzed.This paper further simulates the downlink MIMO-SCMA system based on space-time coding, compares the error performance of multi-antenna SCMA and single-antenna SCMA, and finds that the combination of MIMO diversity and SCMA technology greatly improves the error performance of downlink.In addition, the effects of different MIMO receiver detection techniques and different channel models on the performance of the receiver are also studied.The results show that the SCMA technology based on MIMO can not only effectively improve the spectral efficiency, but also has a higher reliability, so it has a better application prospect.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3

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