本文關(guān)鍵詞：基于OFDM的認(rèn)知無(wú)線電技術(shù)研究　出處：《吉林大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 認(rèn)知無(wú)線電 正交頻分復(fù)用 頻譜感知 頻譜資源分配

【摘要】：目前，無(wú)線通信技術(shù)發(fā)展十分迅速，迫切需要大量的無(wú)線頻譜資源，而頻譜資源的匱乏極大地阻礙了無(wú)線通信技術(shù)的發(fā)展。目前固定頻率的靜態(tài)頻譜資源分配技術(shù)使頻譜資源利用率極低。認(rèn)知無(wú)線電為動(dòng)態(tài)的頻譜資源管理策略，它被認(rèn)為是一種提高頻譜資源使用效率和擴(kuò)大系統(tǒng)容量，緩解頻譜資源使用壓力的新方法。本文將認(rèn)知無(wú)線電技術(shù)和OFDM技術(shù)兩者結(jié)合，提高了頻譜利用率。 本文首先介紹了認(rèn)知無(wú)線電系統(tǒng)中的一些常見(jiàn)概念和關(guān)鍵技術(shù)，基于常見(jiàn)概念和關(guān)鍵技術(shù)對(duì)認(rèn)知無(wú)線電頻譜感知技術(shù)進(jìn)行研究，介紹單用戶感知和協(xié)作檢測(cè)這兩類頻譜檢測(cè)方法，并對(duì)它們進(jìn)行性能仿真比較。每種頻譜檢測(cè)方式都有各自的優(yōu)缺點(diǎn)，只有根據(jù)認(rèn)知用戶的性質(zhì)及需求來(lái)選取合適的檢測(cè)方法才能得到最優(yōu)檢測(cè)結(jié)果。然后，闡述了OFDM技術(shù)的基本工作原理及資源分配方式，，建立基于OFDM的認(rèn)知無(wú)線電系統(tǒng)模型，分析系統(tǒng)中認(rèn)知用戶對(duì)主用戶的干擾及主用戶對(duì)認(rèn)知用戶的干擾。最后，通過(guò)研究學(xué)習(xí)認(rèn)知無(wú)線電頻譜資源分配的分類及分配原則，基于建立的基于OFDM的認(rèn)知無(wú)線電系統(tǒng)模型，介紹頻譜資源分配方案中的四種子載波分配算法和基于線性注水機(jī)制的功率分配算法，提出了PI算法的簡(jiǎn)化算法PIA和PIB，簡(jiǎn)化算法的復(fù)雜度低但性能接近原算法。結(jié)尾對(duì)全文進(jìn)行總結(jié)和展望，對(duì)文中所做研究工作進(jìn)行了初步歸納，并對(duì)研究工作中存在的不足進(jìn)行了分析，對(duì)以后需要進(jìn)一步開(kāi)展的研究工作進(jìn)行了簡(jiǎn)要描述。
[Abstract]:At present, wireless communication technology is developing very rapidly, and a large number of wireless spectrum resources are urgently needed. The lack of spectrum resources greatly hinders the development of wireless communication technology. At present, the static spectrum resource allocation technology with fixed frequency makes the spectrum resource efficiency extremely low. Cognitive radio is a dynamic spectrum resource management strategy. It is considered to be a new method to improve the efficiency of spectrum resources, expand the system capacity and relieve the pressure of spectrum resources. This paper combines cognitive radio technology and OFDM technology. The spectrum efficiency is improved. This paper first introduces some common concepts and key technologies in cognitive radio system. Based on common concepts and key technologies, the spectrum sensing technology of cognitive radio is studied. Two kinds of spectrum detection methods, single user sensing and cooperative detection, are introduced, and their performance is simulated and compared. Each spectrum detection method has its own advantages and disadvantages. Only according to the nature and needs of cognitive users to select the appropriate detection method can get the optimal detection results. Then, the basic working principle and resource allocation of OFDM technology are expounded. A cognitive radio system model based on OFDM is established to analyze the interference of cognitive users to primary users and the interference of primary users to cognitive users. Finally. By studying the classification and allocation principle of learning cognitive radio spectrum resource allocation, a cognitive radio system model based on OFDM is established. The four subcarrier allocation algorithms and the power allocation algorithm based on linear water injection mechanism are introduced in the spectrum resource allocation scheme. A simplified Pi algorithm, PIA and PIB, is proposed. The simplified algorithm has a low complexity but its performance is similar to the original algorithm. At the end of the paper the paper summarizes and prospects the research work and analyzes the shortcomings of the research work. The further research work needed to be carried out in the future is briefly described.
【學(xué)位授予單位】：吉林大學(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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本文編號(hào)：1430881