本文選題：多載波　切入點：正交頻分復用　出處：《電子科技大學》2017年博士論文

【摘要】：以正交頻分復用(Orthogonal Frequency Division Multiplexing,OFDM)為代表的多載波系統(tǒng)具有抗窄帶干擾、抗頻率選擇性衰落和頻譜效率高的優(yōu)點,是無線通信物理層的重要傳輸技術。然而,OFDM傳輸波形在非正交頻點存在較高的旁瓣,旁瓣疊加會導致嚴重的頻譜泄露,從而對相鄰頻段造成干擾,影響了系統(tǒng)的頻譜利用率。因而,如何高效地抑制多載波旁瓣,降低頻譜泄露,從而提升頻譜利用率,是未來移動通信物理層亟待解決的問題。針對上述問題,本文研究了基于旁瓣抑制的新型多載波傳輸技術,分別對子載波塊和單個子載波進行了高效的旁瓣抑制,提出了一系列降低頻譜泄露的信號處理方法,力求在誤碼率性能、頻譜泄露、計算復雜度等因素之間取得較好的平衡。本文的研究內(nèi)容如下:第一,研究了基于子載波塊的旁瓣抑制技術。本文提出了一種時域構造的N連續(xù)OFDM(Time-Domain N-continuous OFDM,TD-NC-OFDM)方法:首先,探索了時域基向量的設計準則,設計了基于基集合的旁瓣抑制信號和收發(fā)信機結(jié)構;其次,探討了時域平滑性和頻域旁瓣的關系,給出了時域N連續(xù)OFDM信號的頻譜表達式;最后,通過理論分析,推導出了新系統(tǒng)中信干噪比的閉合表達式。為了改善時域N連續(xù)OFDM的誤碼率,簡化信號檢測的復雜度,本文進一步提出了一種低干擾的時域N連續(xù)OFDM算法:該算法根據(jù)旁瓣抑制信號的時域分布特征,優(yōu)化了旁瓣抑制信號的時域波形,降低了旁瓣抑制信號引入的干擾,從而顯著提升了系統(tǒng)的傳輸性能。第二,研究了基于單個子載波的旁瓣抑制技術。本文針對低旁瓣的廣義頻分復用(Generalized Frequency Division Multiplexing,GFDM)系統(tǒng),通過引入離散Gabor變換(Discrete Gabor Transform,DGT)的數(shù)學構造,提出了一種高效的頻域DGT信號檢測算法,并理論推導了信號干擾、信道特性和GFDM濾波器的制約關系。此外,為了進一步降低GFDM的實現(xiàn)復雜度,本文基于合成窗和解析窗的頻域局部特性,提出了一種簡化的頻域DGT檢測算法,通過理論分析,證明了簡化算法具有最優(yōu)解析窗,能夠在無線衰落信道下獲得較好的誤碼率性能。第三,研究了基于子載波塊和單個子載波的聯(lián)合旁瓣抑制技術�；贜連續(xù)OFDM和GFDM技術,本文提出了一種時域N連續(xù)GFDM(Time-Domain N-continuous GFDM,TD-NC-GFDM)方法:首先,研究了適合GFDM波形的基集合和旁瓣抑制信號結(jié)構;其次,分析了時域N連續(xù)GFDM信號的低干擾特性;最后,提出了迭代的干擾消除算法。最后,研究了頻域旁瓣和時域峰均比的聯(lián)合抑制技術。本文將N連續(xù)OFDM與串行峰值抵消相結(jié)合,提出了一種高效的聯(lián)合抑制方法,并通過凸集映射的理論,分析了頻域旁瓣抑制處理和時域峰均比抑制處理在時頻域特性的制約關系;本文還提出了相應的接收端信號恢復算法,以改善系統(tǒng)的誤碼率性能。
[Abstract]:The multicarrier system, represented by orthogonal Frequency Division Multiplexing OFDM (OFDM), has the advantages of anti-narrowband interference, anti-frequency selective fading and high spectral efficiency. It is an important transmission technology in the physical layer of wireless communication.However, OFDM transmission waveforms have high sidelobe at non-orthogonal frequency points, the superposition of sidelobe will lead to serious spectrum leakage, which will interfere with adjacent frequency bands and affect the spectrum efficiency of the system.Therefore, how to efficiently suppress multi-carrier sidelobe, reduce spectrum leakage and improve spectrum efficiency is an urgent problem to be solved in the physical layer of mobile communication in the future.In order to solve the above problems, a new multi-carrier transmission technology based on sidelobe suppression is studied in this paper. The efficient sidelobe suppression for sub-carrier block and single sub-carrier is carried out, and a series of signal processing methods to reduce spectrum leakage are proposed.We strive to achieve a good balance between error rate performance, spectrum leakage, computational complexity and other factors.The main contents of this paper are as follows: first, the sidelobe suppression technique based on subcarrier block is studied.In this paper, a time-domain constructed N-continuous OFDM(Time-Domain N-continuous OFDM TD-NC-OFDM method is proposed. Firstly, the design criteria of the time-domain basis vector are explored, and the sidelobe suppression signal and transceiver structure based on the basis set are designed.The relationship between time domain smoothness and frequency domain sidelobe is discussed, and the spectrum expression of time domain N continuous OFDM signal is given. Finally, through theoretical analysis, the closed expression of CITIC signal-to-noise ratio is derived.In order to improve the bit error rate of N-continuous OFDM in time domain and simplify the complexity of signal detection, a low-interference N-continuous OFDM algorithm in time domain is proposed in this paper. The algorithm is based on the time-domain distribution characteristics of sidelobe suppression signal.The time domain waveform of sidelobe suppression signal is optimized, and the interference induced by sidelobe suppression signal is reduced, thus improving the transmission performance of the system.Secondly, the sidelobe suppression technique based on single subcarrier is studied.In this paper, for generalized Frequency Division multiplexing (GFDM) system with low sidelobe, an efficient frequency domain DGT signal detection algorithm is proposed by introducing discrete Gabor transform (discrete Gabor transform), and signal interference is derived theoretically.The relationship between channel characteristics and GFDM filters.In addition, in order to further reduce the complexity of GFDM implementation, this paper proposes a simplified frequency-domain DGT detection algorithm based on the local characteristics of synthetic and analytic windows in frequency domain. Through theoretical analysis, it is proved that the simplified algorithm has an optimal analytic window.It can obtain better bit error rate performance in wireless fading channel.Thirdly, the joint sidelobe suppression technique based on subcarrier block and single subcarrier is studied.Based on N continuous OFDM and GFDM techniques, a time domain N continuous GFDM(Time-Domain N-continuous GFDM TD-NC-GFDM method is proposed. Firstly, the base set and sidelobe suppression signal structure suitable for GFDM waveforms are studied; secondly, the low interference characteristics of time domain N continuous GFDM signals are analyzed.Finally, an iterative interference cancellation algorithm is proposed.Finally, the joint suppression technique of side lobe and time domain peak-to-average ratio (PAPR) in frequency domain is studied.In this paper, an efficient joint suppression method is proposed by combining N continuous OFDM with serial peak cancellation. By using the theory of convex set mapping, the constraints of frequency domain sidelobe suppression and time domain peak-to-average ratio suppression are analyzed.In order to improve the bit error rate (BER) performance of the system, a corresponding signal recovery algorithm is proposed in this paper.
【學位授予單位】：電子科技大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TN929.53

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