【摘要】：隨著無線接入技術(shù)的飛速發(fā)展以及無線終端設(shè)備的日益普及,新的無線業(yè)務(wù)源源不斷地產(chǎn)生,使得頻譜資源的使用極度緊張。無線通信系統(tǒng)必須采用更為創(chuàng)新的技術(shù)和手段,提高頻譜資源使用效率,才能滿足日益增長的傳輸速率需求。感知無線電作為一種提高頻譜利用率的技術(shù),它允許感知用戶在保護主用戶正常傳輸?shù)那疤嵯?機會地接入主用戶的授權(quán)頻段。本文以頻譜資源有限、人們對頻譜資源的需求日益增長以及現(xiàn)有頻譜分配方式頻譜利用率低的客觀現(xiàn)實為背景,研究了基于非正交放大轉(zhuǎn)發(fā)協(xié)作及非完整全局信息的非自私感知協(xié)作傳輸系統(tǒng)(NSCRS)的功率優(yōu)化分配問題。第二章中首先闡述了為最大化一個非自私共生感知協(xié)作傳輸容量而進行的感知用戶的功率優(yōu)化分配的模型。該模型中,感知用戶可以通過為主用戶提供非正交放大轉(zhuǎn)發(fā)協(xié)作來獲得激勵時間,并用于自身數(shù)據(jù)的傳輸。該章節(jié)中針對該模型提出了基于完整全局信息的最優(yōu)功率分配算法,高效利用了頻譜資源,提高了系統(tǒng)的吞吐量。同時本文中還提出了一個基于非完整全局信息的次優(yōu)功率分配算法。該算法在一定的信道狀態(tài)下可以達到與最優(yōu)算法近似的效果。除此之外,本文另外還以NSCRS為基礎(chǔ),在基站與感知用戶能量受限的條件下提出了一個以能量高效為目的的感知用戶時間與能量聯(lián)合分配優(yōu)化算法,并以一個新的單位“比特/秒/焦耳”來衡量能量效率,兼顧了系統(tǒng)的數(shù)據(jù)吞吐量和能量效率。在該模型中,感知網(wǎng)絡(luò)中的接入點可以控制感知用戶輔助主用戶傳輸?shù)臅r間和用于協(xié)作傳輸?shù)哪芰渴褂�。以此在完成最低吞吐量的基礎(chǔ)上提高系統(tǒng)的全局能量效率。同樣的,算法分為完整全局信息的分配算法和非完整全局信息的分配算法,后者在假設(shè)的信道狀態(tài)下同樣可以達到前者的性能標準。
[Abstract]:With the rapid development of wireless access technology and the increasing popularity of wireless terminal devices, new wireless services are constantly generated, which makes the use of spectrum resources extremely tight. In order to meet the increasing demand of transmission rate, wireless communication system must adopt more innovative technology and means to improve the efficiency of spectrum resources. As a technology to improve spectrum efficiency, perceptual radio allows the sensing user to access the authorized frequency band of the host user on the premise of protecting the normal transmission of the primary user. This paper is based on the objective reality of limited spectrum resources, increasing demand for spectrum resources and low spectral efficiency of existing spectrum allocation methods. In this paper, the optimal power allocation of (NSCRS) based on nonorthogonal amplification and forwarding cooperation and nonholonomic global information is studied. In the second chapter, a model of optimal power allocation for perceptual users is presented to maximize the cooperative transmission capacity of a non-selfish symbiotic perception. In this model, the perceptual user can obtain the excitation time by providing non-orthogonal amplification and forwarding cooperation, and it can be used for the transmission of its own data. In this chapter, an optimal power allocation algorithm based on complete global information is proposed, which makes efficient use of spectrum resources and improves the throughput of the system. At the same time, a suboptimal power allocation algorithm based on nonholonomic global information is proposed. The algorithm can achieve the same effect as the optimal algorithm in a certain channel state. In addition, on the basis of NSCRS, this paper proposes a joint allocation algorithm of sensing user time and energy for the purpose of energy efficiency under the condition that the energy of the base station and the perceptual user is limited. A new unit of bit / second / joule is used to measure energy efficiency, which takes into account the data throughput and energy efficiency of the system. In this model, the access point in the perceptual network can control the time of sensing the primary user's transmission and the energy used for cooperative transmission. Therefore, the global energy efficiency of the system is improved on the basis of the minimum throughput. Similarly, the algorithm is divided into complete global information allocation algorithm and non-holonomic global information allocation algorithm, the latter can also meet the performance standard of the former under the assumed channel state.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN014

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