基于混合OFDM调制的认知网络快速组网技术

发布时间：2018-01-12 08:27

本文关键词：基于混合OFDM调制的认知网络快速组网技术　出处：《东南大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为了使节点设备在日益复杂的网络环境下具备快速组网能力,提出一种基于信号循环谱特征的混合OFDM调制算法,并将其应用到协同认知网络中.该算法利用信号内在的循环平稳特性,并人工嵌入唯一的循环平稳标示,可以强化信号的频谱特征,从而能够快速识别出信道空闲、认知信号传输、主用户信号传输和2种信号混叠4种状态,为认知信号的快速可靠接入和退出提供保障.进一步地利用混合调制的位置来标记不同的认知网络,使认知节点可以区分来自不同网络的信号,从而使系统具备快速组网的能力.仿真结果显示,所提算法在提高频谱利用率的基础上,能够实时地辨识出节点的调制方式和网络标识号,实现了快速组网的目的.
[Abstract]:A hybrid OFDM modulation algorithm based on the characteristics of signal cyclic spectrum is proposed in order to make the node equipment have fast networking capability in the increasingly complex network environment. The algorithm utilizes the inherent cyclic stationary characteristic of the signal and embeds the unique cyclic stationary label artificially, which can enhance the spectrum characteristics of the signal. Thus, we can quickly identify four states of channel idle, cognitive signal transmission, primary user signal transmission and two signal aliasing. It provides a guarantee for the fast and reliable access and exit of cognitive signals, and further uses the position of mixed modulation to mark different cognitive networks, so that the cognitive nodes can distinguish the signals from different networks. The simulation results show that the proposed algorithm can identify the modulation mode and the network identification number of the nodes in real time on the basis of improving the spectrum efficiency. The purpose of fast networking is realized.
【作者单位】：南京理工大学电子工程与光电技术学院;南京理工大学紫金学院;中国航空无线电电子研究所;
【基金】：国家海洋公益重大专项资助项目(201205035)
【分类号】：TN925
【正文快照】： 在信息化网络中,节点之间存在不断变化的主从和协同关系,随着网络信息化程度的不断提高,节点类型更加多元并且数量巨大,节点之间关系更加错综复杂.在异构网络环境下,节点之间存在多种通信标准和体制,各种无线网络难以主动感知无线频谱环境进而调整自身的工作参数.这些问题的根

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