本文選題：FMT調(diào)制 + 多相分解�。� 參考：《重慶郵電大學》2016年碩士論文

【摘要】：為適應未來海量移動數(shù)據(jù)流量的飛速增長,第五代移動通信要求最大限度地利用各種頻帶資源,這對物理層的傳輸波形提出了更高頻域分辨率、更高頻帶效率等苛刻的特性要求。濾波多音(Filtered MultiTone,FMT)調(diào)制是一種基于濾波器組的多載波調(diào)制系統(tǒng)。與第四代移動通信物理層核心技術(shù)——正交頻分復用(Orthogonal Frequency Division Multiplexing,OFDM)相比,FMT可以靈活地選擇平滑的濾波函數(shù)代替OFDM中的矩形函數(shù),從而達到更高的頻譜分辨率和更好的頻譜約束能力,避免了循環(huán)前綴和虛載波等額外開銷。但為了滿足特定的頻率特性要求,濾波器的設(shè)計長度往往大于系統(tǒng)符號周期,造成FMT實現(xiàn)工作頻率高,運算復雜度大,靈活性差,極大地約束了其在未來下一代網(wǎng)絡物理層的應用前景。針對這些問題,本文對FMT系統(tǒng)進行了詳細的研究,研究成果如下:1.研究了基于快速卷積的FMT(Fast-Convolution FMT,FC-FMT)實現(xiàn)方案。該方案放棄傳統(tǒng)時域?qū)崿F(xiàn)方式,從FMT系統(tǒng)輸入輸出信號的頻域變化分析出發(fā),利用基于重疊保留法的快速卷積原理,將時域卷積轉(zhuǎn)換為頻域乘積,并采用頻率抽樣法設(shè)計原型濾波器,在頻域?qū)崿F(xiàn)了FMT調(diào)制系統(tǒng)。通過對子載波濾波器互不重疊的FC-FMT系統(tǒng)進行仿真,驗證了該實現(xiàn)方案的有效性,表明了原型濾波器的設(shè)計和重疊因子的大小是影響系統(tǒng)的主要因素。2.比較了直接實現(xiàn)、多相實現(xiàn)和快速卷積實現(xiàn)三種FMT系統(tǒng)方案。通過比較得出,快速卷積實現(xiàn)方案因需要引入過采樣因子,其頻譜利用率低于其他兩種實現(xiàn)方案,但其運算速率較低,運算量較少,更適用于實際的高速數(shù)據(jù)傳輸。同時,該實現(xiàn)方案可以靈活地選擇使用或關(guān)閉某段頻譜,也可以靈活地控制子信道的中心頻率和帶寬,具有更好的靈活性。3.提出了一種提高FC-FMT系統(tǒng)頻譜利用率的方案(Overlapping FC-FMT)。該方案針對FC-FMT系統(tǒng)頻帶效率低下的問題,通過控制相鄰濾波器間重疊點數(shù)來提高系統(tǒng)頻譜利用率。首先從理論上推導了由頻譜重疊引入的干擾濾波器,并通過仿真驗證了在提高頻譜利用率的前提下,額外增加的載波間干擾可被控制在一定范圍內(nèi)。然后建立Overlapping FC-FMT系統(tǒng)仿真平臺,仿真結(jié)果表明在參數(shù)(重疊因子、重疊點數(shù)、滾降系數(shù))配置不同的情況下,系統(tǒng)表現(xiàn)出不同的性能(運算復雜度、頻譜利用率、均方誤差等)。正因為Overlapping FC-FMT系統(tǒng)具有這種良好的靈活性的特點,因而在實際應用中,可通過簡單地配置最優(yōu)參數(shù)以滿足各種業(yè)務的不同需求。
[Abstract]:In order to adapt to the rapid growth of mass mobile data flow in the future, the fifth generation mobile communication needs to maximize the use of various frequency band resources, which brings forward a higher frequency domain resolution for the transmission waveform of physical layer. Higher bandwidth efficiency and other demanding characteristics. Filtered multitone FMTM modulation is a multi-carrier modulation system based on filter banks. Compared with the core technology of the physical layer of the fourth generation mobile communication, orthogonal Frequency Division Multiplexing OFDM (OFDM), FMT can flexibly select smooth filtering functions instead of rectangular functions in OFDM, thus achieving higher spectral resolution and better spectral constraint. The overhead of cyclic prefix and virtual carrier is avoided. However, in order to meet the requirements of specific frequency characteristics, the design length of the filter is often longer than the symbol period of the system, which results in the high frequency, high computational complexity and poor flexibility of the FMT implementation. It greatly restricts its application prospect in the next generation network physical layer in the future. In order to solve these problems, this paper studies the FMT system in detail, and the research results are as follows: 1. The implementation scheme of FMT(Fast-Convolution FMT FC-FMT based on fast convolution is studied. This scheme gives up the traditional time domain realization, starting from the frequency domain variation analysis of the input and output signal of FMT system, using the fast convolution principle based on the overlapping reservation method, the time domain convolution is converted into the frequency domain product. The prototype filter is designed by frequency sampling method, and the FMT modulation system is implemented in frequency domain. The effectiveness of the scheme is verified by the simulation of the FC-FMT system where the subcarrier filter is not overlapped. It is shown that the design of the prototype filter and the magnitude of the overlap factor are the main factors affecting the system. Three kinds of FMT system schemes, direct realization, multiphase realization and fast convolution realization, are compared. By comparison, it is concluded that the spectrum efficiency of the fast convolution scheme is lower than that of the other two schemes because of the need to introduce oversampling factor, but its operation rate is lower and the calculation amount is less, so it is more suitable for the practical high-speed data transmission. At the same time, the scheme can flexibly choose to use or close a certain section of the spectrum, but also can flexibly control the central frequency and bandwidth of the subchannel, so it has better flexibility. 3. A scheme to improve the spectral efficiency of FC-FMT system is proposed. Aiming at the problem of low bandwidth efficiency in FC-FMT system, the scheme improves the spectral efficiency by controlling the overlap points between adjacent filters. Firstly, the interference filter introduced by spectrum overlap is deduced theoretically, and the simulation results show that the additional inter-carrier interference can be controlled in a certain range on the premise of improving spectrum efficiency. Then the Overlapping FC-FMT system simulation platform is established. The simulation results show that the system has different performance (computational complexity, spectrum efficiency, mean square error, etc.) when the parameters (overlap factor, overlap number, roll down coefficient) are different. Because of the good flexibility of Overlapping FC-FMT system, in practical applications, the optimal parameters can be simply configured to meet the different needs of various services.
【學位授予單位】：重慶郵電大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN929.5;TN911.3

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相關(guān)期刊論文 前1條

1 尤肖虎;潘志文;高西奇;曹淑敏;鄔賀銓;;5G移動通信發(fā)展趨勢與若干關(guān)鍵技術(shù)[J];中國科學:信息科學;2014年05期

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本文編號：1878204