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

【摘要】：隨著無線通信技術(shù)的發(fā)展和多媒體新業(yè)務(wù)的出現(xiàn),IP化、扁平化正在成為未來無線通信網(wǎng)絡(luò)的主要特征,而分布式無線多跳網(wǎng)絡(luò)則是推動(dòng)這一趨勢(shì)的強(qiáng)勁動(dòng)力。多跳無線網(wǎng)絡(luò)支持多跳連接,具有覆蓋范圍廣、組網(wǎng)靈活、抗毀性強(qiáng)以及快速部署等優(yōu)點(diǎn),已經(jīng)被業(yè)內(nèi)人士普遍認(rèn)為是無線網(wǎng)絡(luò)技術(shù)的一個(gè)發(fā)展方向。與此同時(shí),多跳中繼技術(shù)逐漸成為未來分布式無線網(wǎng)絡(luò)的重要支撐技術(shù)。通常研究的分布式網(wǎng)絡(luò)中繼策略大都是基于兩跳的中繼轉(zhuǎn)發(fā),但實(shí)際的分布式網(wǎng)絡(luò)中存在多個(gè)用戶節(jié)點(diǎn),當(dāng)不在彼此通信范圍內(nèi)的兩個(gè)節(jié)點(diǎn)要通信時(shí)需要經(jīng)過多個(gè)節(jié)點(diǎn)轉(zhuǎn)發(fā)。因此本文首先歸納總結(jié)了適用于任意跳數(shù)雙向中繼轉(zhuǎn)發(fā)的節(jié)點(diǎn)收發(fā)過程,以此為理論算法,設(shè)計(jì)了無線分布式多跳網(wǎng)絡(luò)通信系統(tǒng)方案,然后利用軟件無線電外設(shè)USRP實(shí)現(xiàn)并演示該系統(tǒng)的通信過程。同時(shí)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(duì)于雙向中繼的無線多跳網(wǎng)絡(luò)系統(tǒng),頻譜分配機(jī)制直接關(guān)系到網(wǎng)絡(luò)中信息的正確傳輸,決定了系統(tǒng)運(yùn)行的可靠性和組網(wǎng)的靈活性。認(rèn)知無線電技術(shù)通過頻譜感知可動(dòng)態(tài)地在授權(quán)頻譜中尋找頻譜空洞,并在不影響授權(quán)用戶的情況下對(duì)空閑頻譜資源進(jìn)行伺機(jī)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(duì)原無線分布式網(wǎng)絡(luò)系統(tǒng)實(shí)現(xiàn)過程中的不足進(jìn)行改進(jìn),將無線分布式網(wǎng)絡(luò)中的節(jié)點(diǎn)加入認(rèn)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(shí)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(jìn)行推廣,歸納總結(jié)了一種適用于任意跳數(shù)中繼轉(zhuǎn)發(fā)的節(jié)點(diǎn)收發(fā)過程,以此為工程實(shí)現(xiàn)的理論基礎(chǔ),利用USRP軟件無線電外設(shè),實(shí)現(xiàn)無線分布式多跳網(wǎng)絡(luò)系統(tǒng),并進(jìn)行演示。(2)針對(duì)無線分布式網(wǎng)絡(luò)系統(tǒng)實(shí)現(xiàn)過程中頻譜分配機(jī)制的不足做出改進(jìn),研究分析認(rèn)知無線分布式網(wǎng)絡(luò)基于協(xié)商的頻譜分配機(jī)制。針對(duì)網(wǎng)絡(luò)在運(yùn)行過程中系統(tǒng)穩(wěn)定性不高、鏈路可靠性較差等特點(diǎn),提出基于節(jié)點(diǎn)同頻的分布式協(xié)商的網(wǎng)絡(luò)頻譜分配機(jī)制。該機(jī)制的最大特點(diǎn)是在保證網(wǎng)絡(luò)基本可用的基礎(chǔ)上,提高了無線鏈路連接的可靠性和系統(tǒng)運(yùn)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(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
【分類號(hào)】：TN925

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