本文選題：5G　切入點：SCMA　出處：《西南交通大學》2017年碩士論文

【摘要】：全球移動通信的發(fā)展已步入5G研究時代,4G最高的傳輸速率可以達到100Mbps,而第五代移動通信需要滿足人們對更高速率的要求。同時,第五代移動通信網絡在信息傳輸過程當中還應該展現(xiàn)出短時延、低功耗、高可靠的特點。在當前的5G研究領域中,非正交多址接入已成為物理層關鍵技術,其中華為公司提出的稀疏編碼多址(SCMA)技術實現(xiàn)了頻域的非正交復用,從而有效提升了頻帶利用率。另一方面,多輸入多輸出(MIMO)技術能夠在不增加頻譜資源前提下有效提升系統(tǒng)容量。本論文主要針對5G移動通信系統(tǒng),通過仿真對SCMA技術及其與MIMO技術的結合展開研究。論文首先簡要介紹了SCMA的系統(tǒng)模型與工作原理,通過系統(tǒng)級仿真對SCMA和OFDMA技術進行了性能對比,發(fā)現(xiàn)SCMA作為下一代無線通信的空口技術,在吞吐量性能上明顯優(yōu)于OFDMA。在此基礎上,論文針對下行SCMA系統(tǒng),采用不同調度算法進行仿真,分析了SCMA系統(tǒng)調度公平性與吞吐量之間的折中。論文進一步地仿真了基于空時編碼的下行鏈路MIMO-SCMA系統(tǒng),將多天線SCMA與單天線SCMA進行誤碼性能對比,發(fā)現(xiàn)MIMO分集技術與SCMA技術結合大大提升了下行鏈路的誤碼性能。此外,文章還研究了不同MIMO接收檢測技術和不同信道模型對接收端誤碼性能的影響。結果表明基于MIMO的SCMA技術,不僅能夠有效提升頻譜利用率,同時還具有更高可靠性,因而具有較好應用前景。
[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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN919.3

【參考文獻】

相關期刊論文 前1條

1 MA Zheng;ZHANG ZhengQuan;DING ZhiGuo;FAN PingZhi;LI HengChao;;Key techniques for 5G wireless communications:network architecture, physical layer,and MAC layer perspectives[J];Science China(Information Sciences);2015年04期

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本文編號：1726899