无线分布式网络的多跳中继与频谱分配研究

发布时间：2018-04-05 17:38

本文选题：分布式无线网络　切入点：多跳中继　出处：《西安电子科技大学》2014年硕士论文

【摘要】：随着无线通信技术的发展和多媒体新业务的出现,IP化、扁平化正在成为未来无线通信网络的主要特征,而分布式无线多跳网络则是推动这一趋势的强劲动力。多跳无线网络支持多跳连接,具有覆盖范围广、组网灵活、抗毁性强以及快速部署等优点,已经被业内人士普遍认为是无线网络技术的一个发展方向。与此同时,多跳中继技术逐渐成为未来分布式无线网络的重要支撑技术。通常研究的分布式网络中继策略大都是基于两跳的中继转发,但实际的分布式网络中存在多个用户节点,当不在彼此通信范围内的两个节点要通信时需要经过多个节点转发。因此本文首先归纳总结了适用于任意跳数双向中继转发的节点收发过程,以此为理论算法,设计了无线分布式多跳网络通信系统方案,然后利用软件无线电外设USRP实现并演示该系统的通信过程。同时由于无线频谱资源是无线通信系统中最宝贵的资源,尤其对于双向中继的无线多跳网络系统,频谱分配机制直接关系到网络中信息的正确传输,决定了系统运行的可靠性和组网的灵活性。认知无线电技术通过频谱感知可动态地在授权频谱中寻找频谱空洞,并在不影响授权用户的情况下对空闲频谱资源进行伺机利用,从而极大地提高频谱使用效率。这种方法能够有效缓解频谱资源紧张与无线通信频谱需求之间的矛盾。在本文中,针对原无线分布式网络系统实现过程中的不足进行改进,将无线分布式网络中的节点加入认知功能,通过频谱感知和协商过程,提高频谱分配的成功率,并利用USRP实现频谱分配的过程。论文主要工作如下:(1)将双向两跳中继方式进行推广,归纳总结了一种适用于任意跳数中继转发的节点收发过程,以此为工程实现的理论基础,利用USRP软件无线电外设,实现无线分布式多跳网络系统,并进行演示。(2)针对无线分布式网络系统实现过程中频谱分配机制的不足做出改进,研究分析认知无线分布式网络基于协商的频谱分配机制。针对网络在运行过程中系统稳定性不高、链路可靠性较差等特点,提出基于节点同频的分布式协商的网络频谱分配机制。该机制的最大特点是在保证网络基本可用的基础上,提高了无线链路连接的可靠性和系统运行的可靠度。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925

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