本文選題：FBMC + OFDM��； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：5G通信的迅速發(fā)展和場(chǎng)景的多樣化對(duì)上行通信鏈路的傳輸提出了更高的要求:希望能夠?qū)崿F(xiàn)更多設(shè)備之間的隨時(shí)隨地的互聯(lián)、獲得更快的數(shù)據(jù)速率、達(dá)到更高的系統(tǒng)容量、消耗更小的終端功耗以及具有更低的傳輸時(shí)延等。正交頻分復(fù)用技術(shù)(Orthogonal Frequency Division Multiplexing,OFDM)因?qū)ν揭蟾�、旁瓣大和頻譜資源利用率較低等限制已不能滿足5G通信的新需求。濾波器組多載波技術(shù)(Filter Bank Multicarrier,FBMC)是5G物理層研究的關(guān)鍵技術(shù)之一,作為一種非正交波形技術(shù),它具有頻譜效率高、旁瓣小和時(shí)頻聚焦性好等特點(diǎn)。目前,5G應(yīng)用的波形技術(shù)仍沒(méi)有定論,評(píng)判新波形技術(shù)需要考慮的因素亦呈多樣性;FBMC在5G上行鏈路的研究仍處于理論研究階段,FBMC在該場(chǎng)景下性能缺乏完整的鏈路級(jí)仿真的驗(yàn)證;針對(duì)多用戶傳輸中存在的時(shí)頻異步的問(wèn)題,FBMC對(duì)同步誤差的魯棒性能仍缺乏充分驗(yàn)證;FBMC應(yīng)用于上行鏈路時(shí),抑制其高峰均功率比(Peak to Average Power Ratio,PAPR)的方案目前有多種,但各種方案的有效性和復(fù)雜度仍有待評(píng)估。針對(duì)以上情況,本文通過(guò)搭建MATLAB鏈路級(jí)仿真平臺(tái)對(duì)FBMC進(jìn)行仿真,其中主要工作和具體貢獻(xiàn)如下:(1)分析FBMC的發(fā)射機(jī)和接收機(jī)原理,并推導(dǎo)基于奈奎斯特原理的原型濾波器的定義式,分析滾降因子對(duì)濾波器的時(shí)頻聚焦特性的影響,進(jìn)而得出使用PHYDYAS原型濾波器的優(yōu)勢(shì)。分析FBMC和OFDM的功率譜密度,PHYDYAS濾波器組的應(yīng)用能夠有效的減小發(fā)射機(jī)帶外功率泄露。(2)研究FBMC在同步傳輸場(chǎng)景下的多種性能,首先本文對(duì)FBMC和OFDM系統(tǒng)的復(fù)雜度進(jìn)行理論的推導(dǎo)和仿真驗(yàn)證,因?yàn)橛?jì)算復(fù)雜度會(huì)導(dǎo)致更高的硬件要求和更長(zhǎng)的通信時(shí)延,因此我們研究重疊因子和傅里葉變換點(diǎn)數(shù)對(duì)FBMC計(jì)算復(fù)雜度的影響。進(jìn)而基于譜效率和時(shí)間效率的理論推導(dǎo),分析FBMC與OFDM的性能差異性,并得出二者對(duì)不同長(zhǎng)度的數(shù)據(jù)包的適用性。最后分析應(yīng)用不同調(diào)制階數(shù)的兩種波形技術(shù)對(duì)上行通信系統(tǒng)誤塊概率和吞吐量的影響。(3)對(duì)5G上行多用戶異步場(chǎng)景進(jìn)行建模,分別研究符號(hào)偏差和頻率偏差對(duì)通信系統(tǒng)的影響,定量分析FBMC對(duì)同步誤差的魯棒性。分析相鄰用戶間的保護(hù)帶寬對(duì)通信系統(tǒng)的影響,時(shí)頻聚焦性較好的原型濾波器有助于減小保護(hù)子載波的開(kāi)銷(xiāo)且有效提高頻譜資源的利用率。(4)基于兩種已有的PAPR抑制方案——即基于離散傅里葉變換(Discrete Fourier Transform,DFT)的擴(kuò)展方案和基于濾波器組(Filter Bank,FB)的擴(kuò)展方案來(lái)降低FBMC的PAPR,分析這兩種方案在實(shí)現(xiàn)原理、性能和復(fù)雜度的差異性。
[Abstract]:The rapid development of 5G communication and the diversification of scenarios put forward higher requirements for uplink transmission: it is hoped that more devices can be interconnected at any time, anywhere and anytime, and faster data rates can be obtained to achieve higher system capacity. Lower terminal power consumption and lower transmission delay. Orthogonal Frequency Division Multiplexing (OFDM) can not meet the new requirements of 5G communication due to its high requirement for synchronization, large sidelobe and low utilization of spectrum resources. Filter Bank Multicarrier Bank (FBMC) is one of the key techniques in the 5G physical layer research. As a non-orthogonal waveform technology, it has the characteristics of high spectral efficiency, small sidelobe and good time-frequency focusing. At present, the waveform technology of 5G application is still uncertain, and the factors to be considered in judging the new waveform technology are also diverse. The research of FBMC in 5G uplink is still in the theoretical research stage, and the performance of FBMC in this scenario is not verified by link level simulation. Aiming at the problem of time-frequency asynchronous in multi-user transmission, the robust performance of FBMC against synchronous error is still not fully verified. When FBMC is used in uplink, there are many schemes to suppress its peak to Average Power ratio (PAPR). However, the effectiveness and complexity of various schemes still need to be evaluated. In view of the above situation, this paper simulates FBMC by building MATLAB link-level simulation platform, in which the main work and specific contribution are as follows: (1) analyzing the transmitter and receiver principle of FBMC. The definition of prototype filter based on Nyquist principle is derived, and the influence of rolling factor on the time-frequency focusing characteristic of filter is analyzed, and the advantage of using PHYDYAS prototype filter is obtained. This paper analyzes the power spectral density of FBMC and OFDM. The application of PHYDYAS filter bank can effectively reduce the out-of-band power leakage of transmitter. First of all, the complexity of FBMC and OFDM systems is theoretically deduced and verified by simulation, because the computational complexity will lead to higher hardware requirements and longer communication delay. So we study the influence of overlap factor and Fourier transform points on the computational complexity of FBMC. Then, based on the theoretical derivation of spectral efficiency and time efficiency, the difference of performance between FBMC and OFDM is analyzed, and their applicability to data packets of different lengths is obtained. Finally, the effects of two waveform techniques of different modulation order on the block error probability and throughput of uplink communication system are analyzed. The 5G uplink multi-user asynchronous scene is modeled, and the effects of symbol deviation and frequency deviation on the communication system are studied respectively. The robustness of FBMC to synchronization error is quantitatively analyzed. The influence of the protection bandwidth between adjacent users on the communication system is analyzed. A prototype filter with better time-frequency focusing can reduce the cost of protecting subcarriers and improve the efficiency of spectrum resources efficiently. It is based on two existing PAPR suppression schemes: discrete Fourier transform (DFT) based on discrete Fourier transform (DFT). The scheme and the extended scheme based on filter bank are used to reduce the FBMC, and the implementation principle of these two schemes is analyzed. The difference between performance and complexity.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.5

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 何賢杰;濾波器組多載波系統(tǒng)信道估計(jì)技術(shù)研究[D];浙江大學(xué);2013年

2 蘆世先;降低FBMC-OQAM信號(hào)峰均功率比的無(wú)失真方法[D];華中科技大學(xué);2013年

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本文編號(hào)：1862557