本文選題：FTN + OVTDM��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：超奈奎斯特(FTN)傳輸和時域重疊復(fù)用(OVTDM)技術(shù)是突破傳統(tǒng)Nyquist傳輸準(zhǔn)則的兩種思想,其特點(diǎn)就是能夠在提升數(shù)據(jù)速率的同時,獲得高效的頻譜利用率。FTN側(cè)重于加快符號速率,通過人為縮短符號間隔讓其小于Nyquist的傳輸間隔,以達(dá)到提升頻譜效率的效果,同時通過盡量保持最小歐氏距離來保障差錯概率。OVTDM技術(shù)則通過采用移位疊加傳輸,人為引入可控的符號間干擾,以改善信號輸出電平分布。OVTDM強(qiáng)調(diào)采用波形分割的思想來區(qū)分不同信號,以獲得盡可能大的編碼增益和較高的頻譜利用率。由于OVTDM采用的不是電平而是波形分割,因而也屬于一種波形編碼。已有研究表明,雖然FTN和OVTDM系統(tǒng)都對不同系統(tǒng)的譯碼性能進(jìn)行了分析,不過都是基于AWGN信道或者低速時變信道場景的分析,有關(guān)高速場景下FTN或者OVTDM系統(tǒng)的性能表現(xiàn),尚未有文獻(xiàn)進(jìn)行研究。為此,有必要進(jìn)行接收機(jī)設(shè)計(jì)的改進(jìn),以更好地估計(jì)由高移動性產(chǎn)生的快時變信道狀態(tài)和有效地消除符號間干擾(ISI,Inter Symbol Interference)和載波間干擾(ICI,Inter carrier Interference),等等�？紤]到高移動場景下的快時變信道干擾的影響,本論文對已有FTN和OVTDM接收機(jī)的結(jié)構(gòu)進(jìn)行了改進(jìn),增加了基于迭代算法的快時變干擾估計(jì)和預(yù)消除模塊,對由信道快時變特性和非正交傳輸引入的干擾預(yù)先進(jìn)行粗略估計(jì)和消除。仿真分析表明,FTN系統(tǒng)中的加速因子對于系統(tǒng)性能的影響較大。論文對于在數(shù)據(jù)傳輸速率提升和保證系統(tǒng)誤碼性能的折衷方案進(jìn)行了分析,重點(diǎn)研究了FTN系統(tǒng)和OVTDM系統(tǒng)的誤碼性能,并基于實(shí)際應(yīng)用采用噪聲白化機(jī)制來消除有色噪聲的強(qiáng)相關(guān)性的影響,以改進(jìn)高移動場景下接收機(jī)系統(tǒng)性能。
[Abstract]:Ultra-Nyquist FTNN transmission and time-domain overlapping multiplexing (TDM) technology are two ideas that break through the traditional Nyquist transmission criterion. Its characteristic is that it can increase the data rate and achieve efficient spectral efficiency. FTN focuses on accelerating the symbol rate.By artificially shortening the symbol interval so that it is smaller than the transmission interval of Nyquist, the spectral efficiency can be improved, and the error probability can be guaranteed by keeping the minimum Euclidean distance. OVTDM technology adopts shift superposition transmission.In order to improve the signal output level distribution. OVTDM emphasizes the idea of waveform segmentation to distinguish different signals in order to obtain as much coding gain as possible and high spectral efficiency.OVTDM is also a waveform coding because it uses waveform segmentation instead of level.Previous studies have shown that, although both FTN and OVTDM systems have analyzed the decoding performance of different systems, they are based on the analysis of AWGN channel or low-speed time-varying channel scenarios, and the performance of FTN or OVTDM systems in high-speed scenarios.No literature has been studied.Therefore, it is necessary to improve the receiver design in order to better estimate the fast time-varying channel state generated by high mobility and effectively eliminate the ISI I / I Symbol interference and ICI / Inter carrier interference, and so on.Considering the influence of fast time-varying channel interference in high mobile scene, the structure of existing FTN and OVTDM receivers is improved in this paper, and the modules of fast time-varying interference estimation and pre-cancellation based on iterative algorithm are added.The interference introduced by fast time-varying channel and non-orthogonal transmission is estimated and eliminated in advance.The simulation results show that the acceleration factor in FTN system has a great influence on the performance of the system.In this paper, the tradeoff between improving the data transmission rate and ensuring the error performance of the system is analyzed, and the error performance of the FTN system and the OVTDM system is mainly studied.Based on the practical application, noise whitening mechanism is adopted to eliminate the influence of strong correlation of colored noise in order to improve the performance of receiver in high mobile scene.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.5

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本文編號：1752891