本文選題：認(rèn)知無(wú)線電　切入點(diǎn)：協(xié)作傳輸　出處：《山西大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：移動(dòng)終端尤其是智能終端和無(wú)線應(yīng)用的廣泛使用,使無(wú)線通信技術(shù)和移動(dòng)通信產(chǎn)業(yè)得到飛速發(fā)展,但同時(shí)也給我們帶來(lái)了很多挑戰(zhàn)。比如作為移動(dòng)通信中不可再生的稀缺資源,無(wú)線頻譜的需求也呈指數(shù)型增長(zhǎng)。因此如何有效地使用頻譜來(lái)提高提高頻譜利用率是目前重要的問(wèn)題。認(rèn)知無(wú)線電(Cognitive Radio, CR)技術(shù)和協(xié)作中繼傳輸(Cooperative Relay Transmission, CRT)技術(shù)作為能夠解決上述問(wèn)題的新型技術(shù)受到廣泛的關(guān)注。認(rèn)知無(wú)線電技術(shù)是一種允許認(rèn)知用戶感知周圍環(huán)境,通過(guò)檢測(cè)找到周圍的空閑授權(quán)頻譜并智能地利用這些頻譜來(lái)傳輸數(shù)據(jù)的技術(shù)。協(xié)作傳輸技術(shù)是指用戶通過(guò)中繼的協(xié)作增大傳輸距離,提高分集增益,有效地抵抗信道衰落。將協(xié)作傳輸技術(shù)應(yīng)用于認(rèn)知網(wǎng)絡(luò)中不僅能夠提高系統(tǒng)的頻譜利用率,而且還使用戶在中繼節(jié)點(diǎn)的協(xié)助下提高了傳輸速率。因此,本論文以基于協(xié)作中繼的認(rèn)知網(wǎng)絡(luò)為研究對(duì)象,研究了以下內(nèi)容：首先,本文研究了一種次用戶通過(guò)幫助主用戶傳輸數(shù)據(jù)獲得頻譜接入機(jī)會(huì)的協(xié)作模型。研究結(jié)果表明,這種協(xié)作模型將頻譜分成兩部分來(lái)分別傳輸主用戶和次用戶的數(shù)據(jù),既可以避免用戶之間的相互影響,又可以提高資源的使用率,而且還提高了增加了次用戶的傳輸速率。本論文第三章詳細(xì)敘述了這種模型中數(shù)據(jù)傳輸過(guò)程和數(shù)值仿真結(jié)果。此外,本論文還研究了一種主用戶與多個(gè)次用戶共存的協(xié)作模型,并且基于此模型提出了協(xié)作功率和頻譜資源分配算法,并在改變主用戶傳輸距離情況下對(duì)次用戶的傳輸速率和主用戶的中斷概率進(jìn)行了數(shù)值仿真。研究結(jié)果表明,這種協(xié)作模型可以在不增加發(fā)射功率的條件下提高系統(tǒng)性能。本論文第四章詳細(xì)敘述了這種模型中數(shù)據(jù)傳輸過(guò)程和數(shù)值仿真結(jié)果。
[Abstract]:With the wide use of mobile terminals, especially intelligent terminals and wireless applications, the wireless communication technology and the mobile communication industry have developed rapidly, but at the same time, it has brought us many challenges, such as being a scarce and non-renewable resource in mobile communications. The demand for wireless spectrum is also increasing exponentially. Therefore, how to use spectrum effectively to improve spectrum efficiency is an important issue. Cognitive Radio Cognitive Radiotechnology and Cooperative Relay Transmission (CRT) Technology. New technologies that can solve these problems have received widespread attention. Cognitive radio is a technology that allows cognitive users to perceive the surrounding environment. Technology that detects the free spectrum around it and uses it intelligently to transmit data. Cooperative transmission means that users increase transmission distance and diversity gain through relay cooperation. The application of cooperative transmission technology in cognitive networks can not only improve the spectral efficiency of the system, but also increase the transmission rate with the assistance of relay nodes. In this thesis, the cognitive network based on cooperative relay is taken as the research object, and the following contents are studied: firstly, this paper studies a cooperative model for secondary users to obtain spectrum access opportunities by helping primary users to transmit data. The results show that:. This collaboration model divides the spectrum into two parts to transmit the data of the primary and secondary users, which can avoid the interaction between users and increase the utilization of resources. In chapter 3, the data transmission process and numerical simulation results of this model are described in detail. In addition, this paper also studies a cooperative model in which primary users and multiple secondary users coexist. Based on this model, a cooperative power and spectrum resource allocation algorithm is proposed, and the secondary user's transmission rate and the primary user's interrupt probability are numerically simulated under the condition of changing the transmission distance of the primary user. This cooperative model can improve the system performance without increasing the transmission power. The data transmission process and numerical simulation results of this model are described in detail in Chapter 4th of this paper.
【學(xué)位授予單位】：山西大學(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)：1618212