【摘要】：認(rèn)知無線電(CR)是智能無線通信領(lǐng)域的新技術(shù),它能感知周圍無線環(huán)境的信息,動(dòng)態(tài)調(diào)整無線電運(yùn)行參數(shù),以滿足用戶需求,改善通信系統(tǒng)性能。認(rèn)知無線電技術(shù)為解決逐漸增長無線業(yè)務(wù)需求與頻譜資源缺乏的矛盾提供了一個(gè)可行的思路,對(duì)環(huán)境的學(xué)習(xí)、動(dòng)作決策和參數(shù)重配置是認(rèn)知無線電的關(guān)鍵技術(shù)。本文通過分析、總結(jié)認(rèn)知無線電網(wǎng)絡(luò)中相關(guān)技術(shù)的研究現(xiàn)狀,使用USRP(Universal Software Radio Peripheral,通用軟件無線電外部設(shè)備)建立了一套認(rèn)知無線電數(shù)據(jù)傳輸實(shí)驗(yàn)系統(tǒng)。同時(shí)針對(duì)用戶信號(hào)的出現(xiàn),提出了一種檢測(cè)間隔的自適應(yīng)調(diào)節(jié)方法,以適應(yīng)多變的無線環(huán)境,減小了系統(tǒng)的檢測(cè)延遲和檢測(cè)次數(shù),從而降低了系統(tǒng)的檢測(cè)開銷。具體工作總結(jié)如下:第一,在總結(jié)已有文獻(xiàn)對(duì)認(rèn)知無線電各種定義和解釋的基礎(chǔ)上,本文設(shè)計(jì)了一種實(shí)現(xiàn)簡單、具有開放性和可擴(kuò)展性的通用認(rèn)知無線電功能實(shí)現(xiàn)架構(gòu),將認(rèn)知無線電數(shù)據(jù)傳輸系統(tǒng)的搭建集中在可重構(gòu)波形組件的設(shè)計(jì)與實(shí)現(xiàn)上。可重構(gòu)波形利用GNU Radio開源軟件無線電技術(shù)實(shí)現(xiàn)一個(gè)波形開發(fā)平臺(tái),具備多項(xiàng)可調(diào)波形參數(shù)、快速波形重構(gòu)能力。第二,在應(yīng)用場(chǎng)景中,檢測(cè)間隔的設(shè)計(jì)成為一個(gè)關(guān)鍵點(diǎn)。本文在充分考慮用戶信號(hào)對(duì)數(shù)據(jù)傳輸?shù)挠绊懞?提供一種檢測(cè)間隔的自適應(yīng)調(diào)節(jié)方法,旨在通過結(jié)合用戶信號(hào)和噪聲信號(hào)分布特征,考慮CR網(wǎng)絡(luò)的特性對(duì)數(shù)據(jù)傳輸?shù)挠绊?將CUSUM算法與可變間隔檢測(cè)算法相結(jié)合,設(shè)計(jì)一種新的檢測(cè)間隔的自適應(yīng)調(diào)節(jié)方法,該方法可在不對(duì)其他用戶造成影響的同時(shí),提升數(shù)據(jù)傳輸?shù)姆⻊?wù)質(zhì)量。第三,在開發(fā)的數(shù)據(jù)傳輸系統(tǒng)平臺(tái)上,設(shè)計(jì)了基于認(rèn)知無線電技術(shù)的抗干擾通信場(chǎng)景實(shí)驗(yàn)。數(shù)據(jù)傳輸系統(tǒng)可快速感知干擾信號(hào)(感知),根據(jù)用戶的抗干擾需求(計(jì)劃),迅速做出推理判斷(決策),調(diào)整波形參數(shù)(執(zhí)行),改善通信效能,降低干擾影響。場(chǎng)景實(shí)驗(yàn)充分表明了認(rèn)知無線電技術(shù)用于抗干擾通信的可行性。
[Abstract]:Cognitive radio (CR) is a new technology in the field of intelligent wireless communication. It can perceive the information of the surrounding wireless environment and dynamically adjust the radio operating parameters to meet the needs of users and improve the performance of communication systems. Cognitive radio technology provides a feasible way to solve the contradiction between the increasing demand for wireless services and the lack of spectrum resources. The key technologies of cognitive radio are environment learning, action decision making and parameter reconfiguration. By analyzing and summarizing the research status of related technologies in cognitive radio network, a set of experimental system for data transmission of cognitive radio is established by using USRP (Universal Software Radio Peripheral, (General Software Radio Peripheral). At the same time, an adaptive adjustment method of the detection interval is proposed to adapt to the changeable wireless environment, and reduce the detection delay and detection times of the system, thus reducing the detection cost of the system. The specific work is summarized as follows: first, on the basis of summarizing all kinds of definitions and interpretations of cognitive radio in existing literature, this paper designs a simple, open and extensible implementation framework of general cognitive radio function. The construction of cognitive radio data transmission system is focused on the design and implementation of reconfigurable waveform components. The reconfigurable waveform uses GNU Radio open source software radio technology to realize a waveform development platform. It has many adjustable waveform parameters and the ability of fast waveform reconstruction. Second, in the application scenario, the design of detection interval becomes a key point. After fully considering the influence of user signal on data transmission, this paper provides an adaptive adjustment method of detection interval. The purpose of this paper is to consider the influence of the characteristics of CR network on data transmission by combining the distribution characteristics of user signal and noise signal. By combining CUSUM algorithm with variable interval detection algorithm, a new adaptive adjustment method of detection interval is designed, which can improve the quality of service of data transmission without affecting other users. Thirdly, the anti-jamming communication scene experiment based on cognitive radio technology is designed on the platform of data transmission system. The data transmission system can quickly perceive the interference signal (perception), according to the user's anti-interference requirement (plan), quickly make the inference judgment (decision), adjust the waveform parameter (execution), improve the communication efficiency, reduce the interference influence. The scene experiment shows the feasibility of using cognitive radio technology in anti-jamming communication.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN925

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本文編號(hào)：2390355