本文選題：正交頻分復用 + 峰均比　； 參考：《東北大學》2012年碩士論文

【摘要】：正交頻分復用(OFDM, Orthogonal Frequency Division Multiplexing)技術因其具有較高的頻譜利用率、能有效對抗多徑衰落、消除符號間干擾等優(yōu)勢已成為未來第四代多媒體移動通信系統(tǒng)的關鍵傳輸技術之一,在天線、導航、航空航天等領域具有廣闊的應用前景。然而,OFDM技術傳輸過程中存在峰均比(PAPR, Peak-to-Average Power Ratio)較高的問題,對功率放大器、A/D轉(zhuǎn)換器等設備的線性范圍提出很高的要求,嚴重影響整個通信系統(tǒng)的運行成本和效率。因此,研究峰均比抑制技術具有深刻的理論意義和應用價值。 本文深入研究了OFDM系統(tǒng)的基本原理,詳細介紹了各部分的實現(xiàn)及系統(tǒng)基本參數(shù)的選擇,針對其特點闡述了OFDM系統(tǒng)中的關鍵技術,概括了OFDM系統(tǒng)的主要優(yōu)缺點,重點分析了高峰均比問題產(chǎn)生的原因及其對系統(tǒng)性能的影響。在此基礎上,詳細分析了峰均比抑制的各類技術,包括預畸變技術、編碼類技術和概率類技術,并簡單介紹了三類技術中的典型算法,為峰均比抑制算法的提出提供理論基礎。 本文重點研究了選擇性映射(Selected Mapping, SLM)算法,針對SLM算法中需要傳送額外邊帶信息的缺點,本文提出了基于邊帶信息隱藏的SLM算法,該算法通過在發(fā)送端插入導頻符號,在接收端利用導頻符號本身攜帶的信息來確定隨機相位序列,從而避免傳輸邊帶信息,節(jié)省了帶寬資源。進一步考慮改善系統(tǒng)峰均比性能,本文提出了基于子塊分割的SLM算法,該算法采用不同的分割方式對數(shù)據(jù)流進行分塊,通過對不同子塊分別進行相位優(yōu)化,選擇具有最小峰均比性能的組合信號進行傳輸,顯著擴大相位因子搜索空間,從而獲得良好的峰均比性能。仿真實驗證明了所提兩種算法的有效性。
[Abstract]:Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiplexing) (orthogonal Frequency Division Multiplexing) (OFDM) have become one of the key transmission technologies in the fourth generation multimedia mobile communication systems in the future because of their high spectral efficiency, which can effectively resist multipath fading and eliminate inter-symbol interference. Navigation, aerospace and other fields have a broad application prospects. However, the problem of high peak to average ratio (PAPR), Peak-to-Average Power Ratio (peak to average ratio) exists in the transmission process of OFDM.The linear range of power amplifier / A / D converter is very high, which seriously affects the operation cost and efficiency of the whole communication system. Therefore, the study of PAPR suppression technology has profound theoretical significance and application value. In this paper, the basic principle of OFDM system is deeply studied, the realization of each part and the selection of system basic parameters are introduced in detail. According to its characteristics, the key technologies in OFDM system are expounded, and the main advantages and disadvantages of OFDM system are summarized. The reason of peak to average ratio problem and its influence on system performance are analyzed. On this basis, various techniques of PAPR suppression, including predistortion, coding and probabilistic techniques, are analyzed in detail. The typical algorithms of the three kinds of techniques are briefly introduced, which provide a theoretical basis for the PAPR suppression algorithm. This paper focuses on the selective mapping selected Mapping (SLM) algorithm. In view of the disadvantages of the SLM algorithm which needs to transmit extra sideband information, this paper proposes a SLM algorithm based on sideband information hiding, which inserts pilot symbols at the sending end. The random phase sequence is determined by using the information carried by the pilot symbols at the receiving end, thus avoiding the transmission of sideband information and saving bandwidth resources. In order to improve the PAPR performance of the system, a new SLM algorithm based on sub-block segmentation is proposed in this paper. The algorithm uses different segmentation methods to divide the data stream into blocks and optimizes the phase of different sub-blocks. A combination signal with minimum peak-to-average ratio (PAPR) is selected for transmission and the phase factor search space is significantly expanded to obtain good PAPR performance. Simulation results show the effectiveness of the proposed two algorithms.
【學位授予單位】：東北大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TN929.53

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