基于SCMA的D2D蜂窝混合网络性能仿真及用户配对研究

发布时间：2018-04-25 01:04

本文选题：稀疏码分多址接入 + D2D　；参考：《西南交通大学》2017年硕士论文

【摘要】：频谱资源短缺和海量用户接入是下一代移动通信系统(5G)面临的重大难题。稀疏码分多址接入(Sparse Code Multiple Access,SCMA)技术是一种新型非正交多址接入方式,其非正交性允许用户过载接入,其码字的稀疏性保证接收端可以以较低复杂度检测用户信息,是5G多址接入的重要候选技术之一。另一方面,D2D技术作为一种直连通信方式,可以有效提升系统的频谱利用率,是5G关键技术之一。本文主要研究基于SCMA的D2D蜂窝混合网络。首先,本文在基于SCMA的D2D蜂窝混合网络中引入了空间点过程的(硬核过程HCP)并建立了相应的干扰模型。通过搭建Matlab仿真平台,对上述混合网络的覆盖率、平均速率和区域面积频谱效率等性能进行了仿真分析,验证了 SCMA相比OFDMA的性能提升。同时,本文对不同网络拓扑结构进行了仿真,对比分析了 HCP结构、传统六边形蜂窝结构和PPP结构的各项性能。结果表明,HCP可以更好地描述网络的拓扑结构。此外,本文研究了基于SCMA的D2D蜂窝混合网络单小区上行链路用户配对算法。根据SCMA码本性质,提出了一种以优化系统平均和速率为目标的用户正交配对算法,该算法在码本尺寸较大时仍具有复杂度低的优势。仿真结果表明,与用户随机配对算法和贪婪算法相比,本文提出的优化算法可以有效地降低系统内干扰并提高系统的平均和速率。
[Abstract]:The shortage of spectrum resources and mass user access are the major problems facing the next generation mobile communication system. Sparse Code Division multiple access (Sparse Code Multiple access) is a new type of non-orthogonal multiple access method. Its nonorthogonality allows users to overload access, and the sparsity of the code word ensures that the receiver can detect user information with low complexity. It is one of the important candidate technologies for 5G multiple access. On the other hand, as a direct communication mode, D2D technology can effectively improve the spectral efficiency of the system, which is one of the key technologies of 5G. This paper focuses on D2D cellular hybrid networks based on SCMA. Firstly, in the D2D cellular hybrid network based on SCMA, the spatial point process (hard core process) is introduced and the corresponding interference model is established. By building the Matlab simulation platform, the performance of the hybrid network such as coverage, average rate and area area spectrum efficiency is simulated and analyzed, which verifies that the performance of SCMA is better than that of OFDMA. At the same time, different network topologies are simulated, and the performances of HCP structure, traditional hexagonal cellular structure and PPP structure are compared and analyzed. The results show that HCP can better describe the topology of the network. In addition, this paper studies a single cell uplink user pairing algorithm based on SCMA in D2D cellular hybrid networks. According to the properties of SCMA codebook, a user orthogonal pairing algorithm aiming at optimizing the average and rate of the system is proposed. The algorithm still has the advantage of low complexity when the codebook size is large. The simulation results show that compared with the random pairing algorithm and greedy algorithm, the proposed optimization algorithm can effectively reduce the intra-system interference and improve the average and speed of the system.
【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】：TN929.5

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