本文選題：衛(wèi)星通信　切入點(diǎn)：DVB-RCS　出處：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：隨著全球網(wǎng)絡(luò)化、信息化的不斷發(fā)展,地面通信網(wǎng)絡(luò)已經(jīng)不能滿足人們?nèi)找嬖鲩L(zhǎng)的通信需求,通過(guò)衛(wèi)星通信系統(tǒng)向固定和移動(dòng)用戶提供多媒體寬帶服務(wù)已經(jīng)成為一種重要的技術(shù)選擇。為了使用戶的資源請(qǐng)求得到最大限度的滿足,同時(shí)優(yōu)化帶寬利用率和網(wǎng)絡(luò)的服務(wù)質(zhì)量,迫切需要采用高效的無(wú)線資源管理(RRM)技術(shù)。無(wú)線資源管理的關(guān)鍵技術(shù)主要包括：呼叫接入控制算法、帶寬分配算法以及時(shí)隙位置分配算法等。本文提出了基于DVB-RCS協(xié)議下的寬帶衛(wèi)星通信系統(tǒng)方案,重點(diǎn)研究了適合本系統(tǒng)方案的呼叫接入控制算法以及帶寬分配算法。本文的主要工作如下：1、給出了基于DVB-RCS的寬帶衛(wèi)星通信系統(tǒng)方案,該方案上行采用MF-TDMA的接入方式,下行采用CWTDM連續(xù)波時(shí)分復(fù)用的方法。對(duì)DVB-RCS協(xié)議進(jìn)行了相關(guān)介紹,給出了基于DVB-RCS的寬帶衛(wèi)星通信系統(tǒng)資源管理體系。2、在綜合考慮衛(wèi)星通信系統(tǒng)網(wǎng)絡(luò)中不同類(lèi)型的業(yè)務(wù)情況下,提出了適用于寬帶衛(wèi)星通信系統(tǒng)的基于網(wǎng)絡(luò)效益最大同時(shí)保證QoS的CAC策略。相比于BNP算法,本文算法具有更高的系統(tǒng)資源利用率,在系統(tǒng)負(fù)載飽和的情況下可以達(dá)到95%,并在一定程度上降低了呼叫請(qǐng)求拒絕率。3、針對(duì)傳統(tǒng)的QoS帶寬分配算法未考慮物理層信道條件而導(dǎo)致系統(tǒng)吞吐量不高,以及現(xiàn)有的基于效用函數(shù)的跨層帶寬分配算法系統(tǒng)公平性下降的問(wèn)題,提出了一種跨層效用公平算法。該算法利用跨層設(shè)計(jì)的思想,聯(lián)合MAC層、應(yīng)用層的QoS參數(shù)和物理層的信道狀態(tài)條件構(gòu)造效用函數(shù),將問(wèn)題轉(zhuǎn)化為求解非線性整數(shù)規(guī)劃問(wèn)題。仿真結(jié)果表明,跨層效用公平算法在公平性僅下降0.006的前提下,可以使得系統(tǒng)的吞吐量增加21個(gè)MPEG-TS包。從而在保證用戶公平性的前提下,最大化系統(tǒng)的吞吐量,實(shí)現(xiàn)了系統(tǒng)公平性和資源利用率的折中。
[Abstract]:With the continuous development of the global network and information technology, the terrestrial communication network can no longer meet the increasing communication needs of people. Providing multimedia broadband services to fixed and mobile users through satellite communication systems has become an important technology choice. It is urgent to adopt efficient RRM technology. The key technologies of RRM mainly include: call access control algorithm. Bandwidth allocation algorithm and slot location allocation algorithm etc. In this paper, a broadband satellite communication system based on DVB-RCS protocol is proposed. This paper focuses on the call access control algorithm and bandwidth allocation algorithm suitable for this system. The main work of this paper is as follows: 1. A broadband satellite communication system scheme based on DVB-RCS is presented. The scheme adopts MF-TDMA access mode in uplink. In this paper, the CWTDM continuous wave time division multiplexing method is used in the downlink. The DVB-RCS protocol is introduced, and the resource management system of broadband satellite communication system based on DVB-RCS. 2. Considering the different types of services in the satellite communication system network synthetically, A CAC strategy based on maximum network efficiency and guaranteed QoS is proposed for broadband satellite communication systems. Compared with the BNP algorithm, the proposed algorithm has a higher system resource utilization ratio. When the system load is saturated, it can reach 95%, and reduce the call rejection rate to a certain extent. The traditional QoS bandwidth allocation algorithm does not consider the physical layer channel condition, so the system throughput is not high. And the problem that the fairness of the existing cross-layer bandwidth allocation algorithm based on utility function is reduced, a cross-layer utility fairness algorithm is proposed, which combines the MAC layer with the idea of cross-layer design. The utility function is constructed by using the QoS parameters of the layer and the channel state condition of the physical layer, and the problem is transformed into a nonlinear integer programming problem. The simulation results show that the cross-layer utility fairness algorithm is only reduced by 0.006 in fairness. The throughput of the system can be increased by 21 MPEG-TS packets, thus maximizing the throughput of the system under the premise of ensuring the fairness of the user, and realizing the compromise between the fairness of the system and the utilization of resources.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN927.2

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