本文選題：分布式無線網(wǎng)絡　切入點：多跳中繼　出處：《西安電子科技大學》2014年碩士論文

【摘要】：隨著無線通信技術的發(fā)展和多媒體新業(yè)務的出現(xiàn),IP化、扁平化正在成為未來無線通信網(wǎng)絡的主要特征,而分布式無線多跳網(wǎng)絡則是推動這一趨勢的強勁動力。多跳無線網(wǎng)絡支持多跳連接,具有覆蓋范圍廣、組網(wǎng)靈活、抗毀性強以及快速部署等優(yōu)點,已經(jīng)被業(yè)內(nèi)人士普遍認為是無線網(wǎng)絡技術的一個發(fā)展方向。與此同時,多跳中繼技術逐漸成為未來分布式無線網(wǎng)絡的重要支撐技術。通常研究的分布式網(wǎng)絡中繼策略大都是基于兩跳的中繼轉發(fā),但實際的分布式網(wǎng)絡中存在多個用戶節(jié)點,當不在彼此通信范圍內(nèi)的兩個節(jié)點要通信時需要經(jīng)過多個節(jié)點轉發(fā)。因此本文首先歸納總結了適用于任意跳數(shù)雙向中繼轉發(fā)的節(jié)點收發(fā)過程,以此為理論算法,設計了無線分布式多跳網(wǎng)絡通信系統(tǒng)方案,然后利用軟件無線電外設USRP實現(xiàn)并演示該系統(tǒng)的通信過程。同時由于無線頻譜資源是無線通信系統(tǒng)中最寶貴的資源,尤其對于雙向中繼的無線多跳網(wǎng)絡系統(tǒng),頻譜分配機制直接關系到網(wǎng)絡中信息的正確傳輸,決定了系統(tǒng)運行的可靠性和組網(wǎng)的靈活性。認知無線電技術通過頻譜感知可動態(tài)地在授權頻譜中尋找頻譜空洞,并在不影響授權用戶的情況下對空閑頻譜資源進行伺機利用,從而極大地提高頻譜使用效率。這種方法能夠有效緩解頻譜資源緊張與無線通信頻譜需求之間的矛盾。在本文中,針對原無線分布式網(wǎng)絡系統(tǒng)實現(xiàn)過程中的不足進行改進,將無線分布式網(wǎng)絡中的節(jié)點加入認知功能,通過頻譜感知和協(xié)商過程,提高頻譜分配的成功率,并利用USRP實現(xiàn)頻譜分配的過程。論文主要工作如下:(1)將雙向兩跳中繼方式進行推廣,歸納總結了一種適用于任意跳數(shù)中繼轉發(fā)的節(jié)點收發(fā)過程,以此為工程實現(xiàn)的理論基礎,利用USRP軟件無線電外設,實現(xiàn)無線分布式多跳網(wǎng)絡系統(tǒng),并進行演示。(2)針對無線分布式網(wǎng)絡系統(tǒng)實現(xiàn)過程中頻譜分配機制的不足做出改進,研究分析認知無線分布式網(wǎng)絡基于協(xié)商的頻譜分配機制。針對網(wǎng)絡在運行過程中系統(tǒng)穩(wěn)定性不高、鏈路可靠性較差等特點,提出基于節(jié)點同頻的分布式協(xié)商的網(wǎng)絡頻譜分配機制。該機制的最大特點是在保證網(wǎng)絡基本可用的基礎上,提高了無線鏈路連接的可靠性和系統(tǒng)運行的可靠度。
[Abstract]:With the development of wireless communication technology and the emergence of new multimedia services, flattening is becoming the main feature of wireless communication network in the future, and distributed wireless multi-hop network is the powerful driving force to promote this trend.Multi-hop wireless network supports multi-hop connection, which has the advantages of wide coverage, flexible networking, strong invulnerability and rapid deployment. It has been widely regarded as a developing direction of wireless network technology.At the same time, multi-hop relay technology has gradually become an important support technology for distributed wireless networks in the future.Most of the distributed network relay strategies are based on two-hop relay forwarding. However, there are many user nodes in the distributed network. When two nodes are not in the range of communication with each other, they need to be forwarded by multiple nodes.Therefore, this paper first summarizes the node transceiver process suitable for arbitrary hops bidirectional relay forwarding, and designs a wireless distributed multi-hop network communication system scheme based on the theoretical algorithm.Then the communication process of the system is realized and demonstrated by software radio peripheral USRP.At the same time, the wireless spectrum resource is the most valuable resource in wireless communication system, especially for the two-way relay wireless multi-hop network system, the spectrum allocation mechanism is directly related to the correct transmission of information in the network.The reliability of the system and the flexibility of networking are determined.Cognitive radio technology can dynamically search for spectrum holes in authorized spectrum through spectrum sensing and make use of idle spectrum resources without affecting authorized users, thus greatly improving the efficiency of spectrum utilization.This method can effectively alleviate the contradiction between spectrum resource shortage and wireless communication spectrum demand.In this paper, aiming at the shortcomings of the original wireless distributed network system, the nodes in the wireless distributed network are added to the cognitive function to improve the success rate of spectrum allocation through spectrum sensing and negotiation.And use USRP to realize the process of spectrum allocation.The main work of this paper is as follows: (1) the bidirectional two-hop relay mode is generalized, and a node transceiver process suitable for arbitrary hop relay forwarding is summarized, which is the theoretical basis of engineering implementation and the use of USRP software radio peripherals.Implement wireless distributed multi-hop network system, and demonstrate. 2) aiming at the deficiency of spectrum allocation mechanism in the implementation of wireless distributed network system, the paper studies and analyzes the spectrum allocation mechanism based on negotiation in cognitive wireless distributed network.In view of the low system stability and poor link reliability during the operation of the network, a distributed network spectrum allocation mechanism based on the same frequency of nodes is proposed.The main characteristic of this mechanism is to improve the reliability of the wireless link connection and the operation of the system on the basis of the basic availability of the network.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN925

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