本文選題：衛(wèi)星多媒體網(wǎng)絡(luò)　切入點(diǎn)：跨層設(shè)計(jì)　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著無(wú)線通信技術(shù)的不斷發(fā)展，空天地一體化已經(jīng)成為了未來(lái)無(wú)線通信領(lǐng)域的發(fā)展趨勢(shì)。衛(wèi)星網(wǎng)絡(luò)由于其具有覆蓋范圍廣和對(duì)距離不敏感等特點(diǎn)，可以很好地填補(bǔ)了地面蜂窩網(wǎng)絡(luò)覆蓋范圍的空白，已經(jīng)成為了空天地一體化信息融合網(wǎng)絡(luò)體系的重要組成部分。衛(wèi)星網(wǎng)絡(luò)現(xiàn)在可以承載各種各樣的多媒體業(yè)務(wù)，，而多媒體業(yè)務(wù)的傳輸對(duì)于衛(wèi)星系統(tǒng)所能夠提供的帶寬資源提出了更高的要求。因此，如何在衛(wèi)星通信系統(tǒng)中對(duì)無(wú)線網(wǎng)絡(luò)資源進(jìn)行管理，保障用戶(hù)終端的業(yè)務(wù)服務(wù)質(zhì)量需求是當(dāng)前面臨的問(wèn)題之一。在衛(wèi)星這種網(wǎng)絡(luò)環(huán)境處于動(dòng)態(tài)變化的通信系統(tǒng)中，傳統(tǒng)的分層協(xié)議設(shè)計(jì)方式很難實(shí)現(xiàn)數(shù)據(jù)傳輸?shù)淖顑?yōu)化設(shè)計(jì)。為了解決衛(wèi)星網(wǎng)絡(luò)資源的優(yōu)化設(shè)計(jì)問(wèn)題，人們提出將跨層設(shè)計(jì)的思想應(yīng)用在衛(wèi)星通信系統(tǒng)中，打破傳統(tǒng)協(xié)議層固定的傳輸模式，通過(guò)層與層之間信息的綜合利用，實(shí)現(xiàn)系統(tǒng)資源利用率的提高。 本文主要研究了DVB-RCS(Digital Video Broadcasting-Return ChannelSatellite)協(xié)議下的衛(wèi)星通信跨層系統(tǒng)的資源管理問(wèn)題。詳細(xì)論述了跨層技術(shù)的實(shí)現(xiàn)原理，對(duì)于OSI(Open System Interconnection, OSI)七層協(xié)議中的各個(gè)協(xié)議層功能進(jìn)行了分析，研究的重點(diǎn)是該傳輸系統(tǒng)的上行鏈路帶寬分配和下行鏈路數(shù)據(jù)包調(diào)度問(wèn)題。首先，針對(duì)衛(wèi)星通信系統(tǒng)的資源有限性和用戶(hù)需求之間的矛盾，提出了一種基于效用函數(shù)最大化的跨層帶寬分配優(yōu)化模型，設(shè)計(jì)了一種可以將不同層間參數(shù)聯(lián)合的跨層效用函數(shù)，即將應(yīng)用層的服務(wù)質(zhì)量要求，物理層和信道狀態(tài)相關(guān)的自適應(yīng)調(diào)制編碼方式，數(shù)據(jù)鏈路層排隊(duì)的優(yōu)先級(jí)等參數(shù)結(jié)合。在求解該基于效用函數(shù)最大化的數(shù)學(xué)模型的過(guò)程中，兼顧考慮系統(tǒng)的效用以及公平性，提出了一種優(yōu)化迭代算法，將有限的帶寬資源優(yōu)化分配給多個(gè)用戶(hù)。對(duì)這種效用函數(shù)最大化跨層優(yōu)化帶寬分配算法的系統(tǒng)性能進(jìn)行了仿真分析，本文提出的效用函數(shù)以及相應(yīng)的優(yōu)化算法在公平性和吞吐量上都優(yōu)于一般化的效用函數(shù)最大化方法和經(jīng)典的注水迭代算法。其次，本文對(duì)于該系統(tǒng)的下行鏈路的數(shù)據(jù)包調(diào)度器進(jìn)行了優(yōu)化，提出了一種考慮了物理層自適應(yīng)調(diào)制編碼技術(shù)，數(shù)據(jù)鏈路層排隊(duì)方法以及應(yīng)用層服務(wù)質(zhì)量結(jié)合的跨層調(diào)度策略。該系統(tǒng)中地面控制中心的調(diào)度結(jié)構(gòu)主要包括優(yōu)化調(diào)度模塊和自適應(yīng)模塊，調(diào)度模塊結(jié)合了輪詢(xún)調(diào)度算法和自適應(yīng)加權(quán)調(diào)度算法，經(jīng)過(guò)跨層優(yōu)化后的系統(tǒng)仿真結(jié)果表明，誤碼率性能明顯優(yōu)于僅采用輪詢(xún)調(diào)度方法的調(diào)度器，吞吐量也有所提高。
[Abstract]:With the continuous development of wireless communication technology, the integration of space, earth and earth has become the development trend of wireless communication field in the future. It can fill the gap in the coverage of terrestrial cellular network, and has become an important part of the integrated information fusion network system. Satellite network can now carry a variety of multimedia services. The transmission of multimedia services requires higher bandwidth resources provided by satellite systems. Therefore, how to manage wireless network resources in satellite communication systems, It is one of the problems to guarantee the service quality of service requirement of user terminal. In the communication system which is in the dynamic change of network environment such as satellite, In order to solve the problem of optimal design of satellite network resources, it is proposed to apply the idea of cross-layer design to satellite communication system. By breaking the fixed transmission mode of the traditional protocol layer and utilizing the information between the layers, the system resource utilization ratio can be improved. In this paper, the problem of resource management in cross-layer system of satellite communication under DVB-RCS(Digital Video Broadcasting-Return Channel Satellite is studied in detail. The implementation principle of cross-layer technology is discussed in detail, and the functions of each layer in OSI(Open System Interconnection (OSI) protocol are analyzed. The research focuses on the uplink bandwidth allocation and downlink packet scheduling of the transmission system. Firstly, the contradiction between the limited resources and the user requirements of the satellite communication system is discussed. A cross-layer bandwidth allocation optimization model based on maximizing utility function is proposed, and a cross-layer utility function is designed, which can combine the parameters of different layers, that is, the quality of service requirements of the application layer. The adaptive modulation coding method related to the physical layer and the channel state, the priority of the data link layer queueing and so on are combined. In solving the mathematical model based on the maximization of utility function, the utility and fairness of the system are taken into account. An optimal iterative algorithm is proposed to optimize the allocation of limited bandwidth resources to multiple users. The system performance of the utility function maximization cross-layer optimal bandwidth allocation algorithm is simulated and analyzed. The utility function proposed in this paper and the corresponding optimization algorithm are superior to the generalized utility function maximization method and the classical water injection iterative algorithm in fairness and throughput. In this paper, the downlink packet scheduler of the system is optimized, and a new adaptive modulation coding technique considering the physical layer is proposed. Data link layer queuing method and cross-layer scheduling strategy combined with application layer quality of service. The scheduling structure of ground control center in this system mainly includes optimal scheduling module and adaptive module. The scheduling module combines polling scheduling algorithm and adaptive weighted scheduling algorithm. The system simulation results show that the BER performance is obviously better than that of the scheduler only using polling scheduling method, and the throughput is also improved.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN927.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 朱析;朱立東;吳詩(shī)其;;衛(wèi)星通信網(wǎng)絡(luò)的跨層設(shè)計(jì)[J];數(shù)字通信世界;2007年04期

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