【摘要】：網(wǎng)絡(luò)信息化和技術(shù)化推動下,無線通信技術(shù)不斷發(fā)展,對通信業(yè)務(wù)的需求日益增長,現(xiàn)有技術(shù)約束下,頻譜資源日益緊張,這也成為無線通信業(yè)務(wù)發(fā)展的桎梏。在現(xiàn)有頻譜資源基礎(chǔ)上,如何動態(tài)、高效地提高頻譜的二次利用成為人們關(guān)注的焦點(diǎn)。認(rèn)知無線電在提高頻譜資源利用率方面的優(yōu)勢,成為緩解頻譜資源緊張的主要渠道之一。通過認(rèn)知無線電的頻譜分配可緩解頻譜資源的緊張,提高資源利用效率,從而改善整個認(rèn)知無線電系統(tǒng)的性能。有效利用頻譜、緩解頻譜資源的緊張,提高系統(tǒng)效用,是認(rèn)知無線電的關(guān)鍵技術(shù),對改善認(rèn)知無線電系統(tǒng)的性能起著關(guān)鍵性的作用。本文基于頻譜資源分配和使用的相關(guān)理論,研究認(rèn)知無線電動態(tài)頻譜的分配和接入問題。具體分析中,首先對認(rèn)知無線電及動態(tài)頻譜的分配和接入問題進(jìn)行系統(tǒng)描述,歸納幾種經(jīng)典的頻譜分配模型和接入算法；然后根據(jù)我國城市無線電頻譜資源分配現(xiàn)狀和存在的主要問題,結(jié)合強(qiáng)化學(xué)習(xí)理論提出動態(tài)頻譜分配的具體方案,并進(jìn)行相應(yīng)的仿真；最后根據(jù)頻譜接入關(guān)鍵技術(shù),進(jìn)一步利用Q學(xué)習(xí)方法對動態(tài)頻譜接入進(jìn)行優(yōu)化設(shè)計(jì)和計(jì)算。本文的研究表明,一方面,認(rèn)知無線電的應(yīng)用可在一定程度上提高信道的使用率,從而緩解有限頻譜資源帶來的通信壓力；另一方面,頻譜分配方案和接入技術(shù)的關(guān)鍵在于減少CR用戶與主用戶之間的沖突,提高CR用戶的有效信息支付率,改善CR用戶的服務(wù)質(zhì)量,從而有效提升系統(tǒng)性能,故需要權(quán)衡實(shí)際需求來選擇不同的頻譜分配方案和接入方法。
[Abstract]:With the promotion of network information and technology, wireless communication technology continues to develop, and the demand for communication services is growing day by day. Under the constraints of existing technology, the spectrum resources are increasingly tight, which has become the shackles of the development of wireless communication services. Based on the existing spectrum resources, how to improve the secondary utilization of spectrum dynamically and efficiently has become the focus of attention. Cognitive radio is one of the main channels to alleviate the shortage of spectrum resources because of its advantages in improving the efficiency of spectrum resources. The spectrum allocation of cognitive radio can alleviate the shortage of spectrum resources, improve the efficiency of resource utilization, and improve the performance of the whole cognitive radio system. It is the key technology of cognitive radio to use spectrum effectively, to alleviate the shortage of spectrum resources and to improve the system utility. It plays a key role in improving the performance of cognitive radio system. Based on the theory of spectrum resource allocation and utilization, this paper studies the dynamic spectrum allocation and access of cognitive radio. In the specific analysis, firstly, the problem of cognitive radio and dynamic spectrum allocation and access is systematically described, and several classical spectrum allocation models and access algorithms are summarized. Then according to the current situation and main problems of urban radio spectrum resource allocation in our country, combined with reinforcement learning theory, the specific scheme of dynamic spectrum allocation is put forward, and the corresponding simulation is carried out. Finally, according to the key technology of spectrum access, Furthermore, the Q learning method is used to optimize the design and calculation of dynamic spectrum access. The research in this paper shows that, on the one hand, the application of cognitive radio can improve the channel utilization to a certain extent, thereby alleviating the communication pressure caused by limited spectrum resources; on the other hand, The key of spectrum allocation and access technology is to reduce the conflicts between CR users and primary users, to improve the effective information payment rate of CR users, and to improve the quality of service of CR users, so as to effectively improve the system performance. Therefore, it is necessary to choose different spectrum allocation schemes and access methods.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN925

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本文編號：2251703