5G新型非正交多址技术研究

发布时间：2018-05-19 23:36

本文选题：5G + 非正交多址　；参考：《北京交通大学》2017年硕士论文

【摘要】：为了支撑移动互联网以及物联网的未来发展,面向2020年及未来的第五代移动通信(Fifth Generation,5G),将逐渐成为用于人与人之间通信以及人与物之间通信中无线网络接入的首要渠道。这就意味着未来的5G无线通信网络将满足多样化入网设备的无线连接需求,以及其各项业务特征的匹配,如极速无线宽带接入、超大系统容量、超高峰值速率、超低端到端延迟、超低功率消耗、"海"量设备连接、"海"量应用场景支持以及超高可靠性等等。然而现有4G通信中针对宽带设计的正交多址技术(Orthogonal Frequency Division Multiple Access,OFDMA)已经不再适用,特别是对于5G大规模机器式通信(massive Machine Type Communication,mMTC)场景来说,这种零星过载系统传输的都是一些小数据包,继续沿用正交多址接入(Orthogonal Multiple Access,OMA)势必会造成资源的浪费以及过度的调度开销。因此为了避免空口资源的浪费,就需要研究新型的非正交多址技术来提高小数据包传输的空口效率。本文对现有5G新型非正交多址技术的原理以及接收机算法进行了调研评估,提出了新的非正交多址方案和相应接收机算法,同时搭建链路级仿真平台进行一系列性能评估,具体内容如下:1.针对新提出的非正交多址技术,如低密度签名多址(Low Density Signature,LDS)、稀疏码多址(Sparse Code Multiple Access,SCMA)、图样分割多址(Pattern Division Multiple Access,PDMA)、多用户共享多址(Multi-user Shared Access,MUSA)、基于功率域的非正交多址(Non-orthogonal Multiple Access,NOMA)、资源扩频多址(Resource Spread Multiple Access,RSMA)等多址方案进行调研,并对主流的消息传递算法(Message Passing Algorithm,MPA)、最小均方误差(Minimum Mean Square Error,MMSE)及串行干扰消除(Successive Interference Cancellation,SIC)等接收机算法进行深入分析研究;2.基于Zadoff-Chu扩频序列的研究,提出新的非正交编码多址接入(Non-orthogonal coded access,NOCA)方案,并且根据现有非正交多址的接收机方案,设计适用于NOCA方案的基于迭代干扰消除的联合最小均方误差(Minimum Mean Square Error with Interference Cancellation,MMSE+IC)接收检测算法;3.基于LTE(Long Term Evolution)平台搭建链路级仿真,对NTT DoCoMo公司提出的NOMA以及华为提出LDS\SCMA技术进行性能评估,同时以OFDMA和SCMA性能作为参考,对新方案NOCA进行了性能评估及理论分析;4.考虑mMTC上行异步接入场景,针对NOCA提出新的抗异步干扰的接收检测改进算法,同时基于成熟的链路平台,分别对SCMA和NOCA这两种非正交多址的抗异步性能进行比较分析;5.考虑实际基站和用户终端的硬件实现的约束条件,本文对现有的5G非正交多址方案用到的接收机进行了详细地接收机分类和计算复杂度分析。
[Abstract]:In order to support the future development of the mobile Internet and the Internet of things, the fifth generation mobile communication facing 2020 and the future will gradually become the primary channel for wireless network access in the communication between people and objects. This means that the future 5G wireless communication network will meet the wireless connection requirements of a variety of access devices and the matching of its various service features, such as extremely fast wireless broadband access, super-large system capacity, ultra-high peak rate, Ultra-low-end-to-end delay, ultra-low power consumption, "sea" equipment connection, "sea" volume application scenario support and ultra-high reliability, and so on. However, orthogonal Frequency Division Multiple access OFDMA (OFDMA) for broadband design in 4G communication is no longer applicable, especially for 5G large-scale machine communication systems with massive Machine Type communication. The continuation of orthogonal Multiple OMA (orthogonal Multiple access OMA) is bound to lead to waste of resources and excessive scheduling overhead. Therefore, in order to avoid the waste of empty port resources, it is necessary to study a new non-orthogonal multiple access technology to improve the efficiency of small packet transmission. In this paper, the principles and receiver algorithms of 5G new non-orthogonal multiple access technology are investigated and evaluated. A new non-orthogonal multiple access scheme and corresponding receiver algorithm are proposed, and a series of performance evaluation is carried out by building a link level simulation platform. The details are as follows: 1. For the newly proposed non-orthogonal multiple access technology, For example, low Density Density signature LDSs, sparse Code multiple access (Sparse Code Multiple access), pattern split multiple access Division Multiple access (PDMAA), Multi-user Shared access MUSA, Non-orthogonal multiple access Multiple (NOMAA) based on power domain, Resource Spread Multiple access (RSMAA), etc., are used to investigate the multiple access schemes, such as low density signature multiple access, sparse code multiple access, pattern partition multiple access Division Multiple, multi-user sharing multi-user Shared access MUSA, non-orthogonal multiple access Multiple based on power domain, resource spread multiple access, Resource Spread Multiple access, and so on. The main algorithms of message Passing algorithm, minimum mean square error (MMSE) and serial interference cancellation (sic) are analyzed and studied in detail. Based on the research of Zadoff-Chu spread spectrum sequence, a new non-orthogonal coded multiple access coded access (NOCA) scheme is proposed, which is based on the existing non-orthogonal multiple access receiver schemes. A joint minimum mean square error (MMSE) receiver detection algorithm based on iterative interference cancellation is designed for NOCA scheme. Based on the LTE(Long Term Evolution platform, the link-level simulation is built to evaluate the performance of NOMA proposed by NTT DoCoMo Company and LDS\ SCMA technology proposed by Huawei. At the same time, the performance evaluation and theoretical analysis of the new scheme NOCA are carried out based on the performance of OFDMA and SCMA. Considering the mMTC uplink asynchronous access scenario, a new anti-asynchronous interference receiving detection improved algorithm is proposed for NOCA. Based on the mature link platform, the anti-asynchronous performance of SCMA and NOCA are compared and analyzed respectively. Considering the constraints of the hardware implementation of real base stations and user terminals, this paper makes a detailed classification and computational complexity analysis of the receivers used in the existing 5G non-orthogonal multiple access schemes.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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