本文選題：OFDMA + 小區(qū)間中繼�。� 參考：《南京郵電大學(xué)》2017年碩士論文

【摘要】：基于正交頻分復(fù)用(OFDM)調(diào)制技術(shù)的OFMDA技術(shù)較傳統(tǒng)蜂窩通信網(wǎng)絡(luò)小區(qū)內(nèi)抗干擾能力更強并且能夠提高頻譜資源利用率,其通過給小區(qū)用戶分配子信道的方式獲得用戶分集效益,為小區(qū)內(nèi)用戶提供了更高的數(shù)據(jù)傳輸速率。然而,由于嚴(yán)重的小區(qū)間干擾(ICI)和系統(tǒng)負(fù)載的分布不均衡導(dǎo)致蜂窩小區(qū)系統(tǒng)資源利用不平衡以及小區(qū)系統(tǒng)公平性和用戶的服務(wù)質(zhì)量(QoS)特別是小區(qū)邊緣用戶難以得到有效保證。所以,對OFDMA蜂窩網(wǎng)絡(luò)的負(fù)載均衡的研究也逐漸成為熱點問題。在傳統(tǒng)蜂窩通信基礎(chǔ)上加入中繼技術(shù),不僅能夠在現(xiàn)有網(wǎng)絡(luò)架構(gòu)的基礎(chǔ)上實現(xiàn)網(wǎng)絡(luò)通信系統(tǒng)覆蓋范圍的拓展以提升小區(qū)容量而且能夠在高頻段有效克服陰影衰落的影響以提升信號質(zhì)量以及減少網(wǎng)絡(luò)建設(shè)成本。然而,引入中繼使得蜂窩網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)和傳輸時隙發(fā)生了變化,并且中繼節(jié)點也可能為新干擾源。在基于采用小區(qū)間中繼的下行OFDMA蜂窩網(wǎng)絡(luò)負(fù)載均衡分析中,我們首先提出了一種基于頻譜和時隙劃分的資源分配方案,并且在該通信模型上分析了干擾情況,從下行鏈路出發(fā)分別分析了基站(BS)和中繼(RS)區(qū)域的子載波剩余情況及再平均分配后系統(tǒng)吞吐率的變化。最后的仿真表明,該方案可以有效緩解過載小區(qū)資源緊張和鄰近小區(qū)資源利用率低的問題,提升了小區(qū)系統(tǒng)的吞吐率。在結(jié)合下行OFDMA蜂窩網(wǎng)絡(luò)的小區(qū)間中繼負(fù)載均衡分析的基礎(chǔ)上,我們進一步對該系統(tǒng)下的用戶公平性進行了分析。在現(xiàn)有模型下,我們首先提出了基于距離的公平調(diào)度算法,分別對BS區(qū)域以及RS區(qū)域進行了剩余子載波的再分配。其次,我們在保證小區(qū)系統(tǒng)公平性盡可能最優(yōu)時,考慮了中繼半徑的最優(yōu)化分析。最后的仿真計算驗證了我們的理論正確性,在原系統(tǒng)的基礎(chǔ)上進一步提升了系統(tǒng)的用戶公平性。
[Abstract]:The OFMDA technology based on orthogonal frequency division multiplexing (OFDM) modulation technology is more powerful than the traditional cellular communication network in anti-jamming ability and can improve the efficiency of spectrum resources. The OFMDA technology obtains the benefits of user diversity by assigning sub-channels to the cell users. It provides higher data transmission rate for the users in the cell. However, due to the severe intercellular interference (ICI) and the uneven distribution of system load, the resource utilization of cellular system is unbalanced, and the fairness of cell system and the quality of service (QoS) of users, especially the edge users, are difficult to be effectively guaranteed. Therefore, the research on load balancing of OFDMA cellular networks has gradually become a hot issue. Adding relay technology to traditional cellular communication, It can not only extend the coverage of network communication system on the basis of the existing network architecture, but also effectively overcome the influence of shadow fading in high frequency band to improve the signal quality and reduce the cost of network construction. However, the introduction of relay makes the topology and transmission time slot of cellular network change, and the relay node may also be a new interference source. In the load balancing analysis of downlink OFDMA cellular network based on inter-cell relay, we first propose a resource allocation scheme based on spectrum and slot division, and analyze the interference on the communication model. Based on the downlink, the sub-carrier residual in the base station (BS) region and the relay (RS) region and the change of the system throughput after redistribution are analyzed respectively. Finally, the simulation results show that the proposed scheme can effectively alleviate the problem of overloaded cell resource shortage and low utilization of adjacent cell resources, and improve the throughput of the cell system. Based on the analysis of inter-cell relay load balancing in downlink OFDMA cellular network, we further analyze the user fairness in this system. Under the existing model, we first propose a distance-based fair scheduling algorithm, which redistributes the residual subcarriers to the BS region and the RS region respectively. Secondly, we consider the optimal analysis of relay radius in order to ensure the fairness of cell system as best as possible. Finally, the simulation results verify the correctness of our theory, and further improve the user fairness of the system based on the original system.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.5

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本文編號：2111581