本文選題：稀疏碼分多址接入 + D2D��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：頻譜資源短缺和海量用戶接入是下一代移動(dòng)通信系統(tǒng)(5G)面臨的重大難題。稀疏碼分多址接入(Sparse Code Multiple Access,SCMA)技術(shù)是一種新型非正交多址接入方式,其非正交性允許用戶過載接入,其碼字的稀疏性保證接收端可以以較低復(fù)雜度檢測用戶信息,是5G多址接入的重要候選技術(shù)之一。另一方面,D2D技術(shù)作為一種直連通信方式,可以有效提升系統(tǒng)的頻譜利用率,是5G關(guān)鍵技術(shù)之一。本文主要研究基于SCMA的D2D蜂窩混合網(wǎng)絡(luò)。首先,本文在基于SCMA的D2D蜂窩混合網(wǎng)絡(luò)中引入了空間點(diǎn)過程的(硬核過程HCP)并建立了相應(yīng)的干擾模型。通過搭建Matlab仿真平臺(tái),對上述混合網(wǎng)絡(luò)的覆蓋率、平均速率和區(qū)域面積頻譜效率等性能進(jìn)行了仿真分析,驗(yàn)證了 SCMA相比OFDMA的性能提升。同時(shí),本文對不同網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)進(jìn)行了仿真,對比分析了 HCP結(jié)構(gòu)、傳統(tǒng)六邊形蜂窩結(jié)構(gòu)和PPP結(jié)構(gòu)的各項(xiàng)性能。結(jié)果表明,HCP可以更好地描述網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)。此外,本文研究了基于SCMA的D2D蜂窩混合網(wǎng)絡(luò)單小區(qū)上行鏈路用戶配對算法。根據(jù)SCMA碼本性質(zhì),提出了一種以優(yōu)化系統(tǒng)平均和速率為目標(biāo)的用戶正交配對算法,該算法在碼本尺寸較大時(shí)仍具有復(fù)雜度低的優(yōu)勢。仿真結(jié)果表明,與用戶隨機(jī)配對算法和貪婪算法相比,本文提出的優(yōu)化算法可以有效地降低系統(tǒng)內(nèi)干擾并提高系統(tǒng)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.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5

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本文編號(hào)：1799052