索引調制OFDM系統(tǒng)鏈路自適應技術研究與仿真
發(fā)布時間：2018-11-04 14:28
【摘要】：隨著無線通信技術的不斷發(fā)展,人們對下一代移動通信系統(tǒng)提出了越來越高的要求。在這樣的時代背景下,具有低峰均比,強頻偏對抗能力和高能量效率的索引調制OFDM系統(tǒng)(Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM)逐漸引起學者們的關注。為了進一步提高索引調制OFDM的傳輸性能,本文從傳輸性能出發(fā),對索引調制OFDM系統(tǒng)的誤碼率和可達速率進行了理論分析和推導,并進一步將鏈路自適應技術運用于索引調制OFDM系統(tǒng)中,分別提出了以優(yōu)化系統(tǒng)誤碼率和可達速率為目的的自適應調制算法和自適應功率分配算法。具體工作可以總結如下:第一章首先介紹了索引調制OFDM系統(tǒng)的發(fā)展歷程,基本原理和優(yōu)缺點,闡述了索引調制OFDM系統(tǒng)的研究現(xiàn)狀,并對本文的主要研究內(nèi)容進行概括性總結。第二章首先給出了索引調制OFDM系統(tǒng)的基本模型,通過理論推導和數(shù)值仿真分析了理想信道條件下索引調制OFDM系統(tǒng)的誤碼率和可達速率,并進一步分析了非理想信道估計下索引調制OFDM系統(tǒng)的誤碼性能及其影響因素。最后,在已有理想信道估計可達速率的基礎上,分析信道估計誤差對它的影響,并給出理論推導和仿真性能比較。第三章研究了索引調制OFDM系統(tǒng)的自適應調制技術。首先討論索引調制OFDM系統(tǒng)自適應調制的基本原理及優(yōu)化準則,并通過分析調制星座圖對誤碼率的影響,提出一種針對索引調制OFDM系統(tǒng)自適應調制的星座圖設計準則�；谒嵝亲鶊D設計方案,提出了一種基于自適應星座點調制的調制方式選擇算法及相應的檢測算法,并進一步提出了一種多子載波塊聯(lián)合自適應星座點調制的收發(fā)端設計。最后,通過仿真驗證所提算法均能達到提升系統(tǒng)誤碼率的目的。第四章研究了索引調制OFDM系統(tǒng)的自適應功率分配算法。首先,以誤碼率性能為優(yōu)化目標,提出了一種基于最小歐氏距離準則的功率分配算法和一種基于歸一化歐氏距離準則的低復雜度功率分配算法,兩種算法通過在每個塊的各個載波之間調節(jié)功率達到提升系統(tǒng)誤碼率的目的。然后,從可達速率性能出發(fā),基于可達速率下界表達式提出了一種在塊與塊之間靈活調節(jié)資源的功率分配方式,該算法通過在各塊之間均衡分配系統(tǒng)資源以到達提升系統(tǒng)可達速率的目的。第五章總結本文主要貢獻,并指出未來可能的研究方向。
[Abstract]:With the continuous development of wireless communication technology, people put forward more and more high requirements for the next generation mobile communication system. Under this background, the index modulation OFDM system (Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM) with low PAPR, strong frequency offset antagonism and high energy efficiency has gradually attracted the attention of scholars. In order to further improve the transmission performance of indexed modulation OFDM, the error rate and reachable rate of index modulated OFDM system are theoretically analyzed and deduced in this paper. Furthermore, the link adaptive technique is applied to index modulation OFDM system. An adaptive modulation algorithm and an adaptive power allocation algorithm are proposed to optimize the system bit error rate and reachable rate, respectively. The specific work can be summarized as follows: the first chapter introduces the development history, basic principle, advantages and disadvantages of index modulation OFDM system, describes the research status of index modulation OFDM system, and summarizes the main research content of this paper. In the second chapter, the basic model of indexed modulation OFDM system is given, and the error rate and reachable rate of index modulated OFDM system under ideal channel conditions are analyzed by theoretical derivation and numerical simulation. Furthermore, the error performance and its influencing factors of indexed modulation OFDM systems under non-ideal channel estimation are analyzed. Finally, on the basis of the available ideal channel estimation reachable rate, the influence of channel estimation error on it is analyzed, and the theoretical derivation and simulation performance comparison are given. In chapter 3, the adaptive modulation technology of indexed modulation OFDM system is studied. The basic principle and optimization criteria of adaptive modulation in indexed modulation OFDM system are discussed. By analyzing the influence of modulation constellation on bit error rate, a constellation design criterion for adaptive modulation of index modulated OFDM system is proposed. Based on the proposed constellation scheme, a modulation selection algorithm based on adaptive constellation modulation and its corresponding detection algorithm are proposed, and a multi-subcarrier block combined adaptive constellation modulation transceiver design is proposed. Finally, the simulation results show that the proposed algorithm can improve the BER of the system. In chapter 4, the adaptive power allocation algorithm for indexed modulation OFDM systems is studied. Firstly, a power allocation algorithm based on minimum Euclidean distance criterion and a low complexity power allocation algorithm based on normalized Euclidean distance criterion are proposed. The two algorithms improve the bit error rate by adjusting the power between the carriers of each block. Then, based on the lower bound expression of reachable rate, a flexible power allocation method is proposed to adjust the resource between blocks. The algorithm achieves the goal of increasing the reachability rate by allocating the system resources evenly among the blocks. The fifth chapter summarizes the main contributions of this paper and points out the possible research direction in the future.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.53
本文編號：2310092
[Abstract]:With the continuous development of wireless communication technology, people put forward more and more high requirements for the next generation mobile communication system. Under this background, the index modulation OFDM system (Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM) with low PAPR, strong frequency offset antagonism and high energy efficiency has gradually attracted the attention of scholars. In order to further improve the transmission performance of indexed modulation OFDM, the error rate and reachable rate of index modulated OFDM system are theoretically analyzed and deduced in this paper. Furthermore, the link adaptive technique is applied to index modulation OFDM system. An adaptive modulation algorithm and an adaptive power allocation algorithm are proposed to optimize the system bit error rate and reachable rate, respectively. The specific work can be summarized as follows: the first chapter introduces the development history, basic principle, advantages and disadvantages of index modulation OFDM system, describes the research status of index modulation OFDM system, and summarizes the main research content of this paper. In the second chapter, the basic model of indexed modulation OFDM system is given, and the error rate and reachable rate of index modulated OFDM system under ideal channel conditions are analyzed by theoretical derivation and numerical simulation. Furthermore, the error performance and its influencing factors of indexed modulation OFDM systems under non-ideal channel estimation are analyzed. Finally, on the basis of the available ideal channel estimation reachable rate, the influence of channel estimation error on it is analyzed, and the theoretical derivation and simulation performance comparison are given. In chapter 3, the adaptive modulation technology of indexed modulation OFDM system is studied. The basic principle and optimization criteria of adaptive modulation in indexed modulation OFDM system are discussed. By analyzing the influence of modulation constellation on bit error rate, a constellation design criterion for adaptive modulation of index modulated OFDM system is proposed. Based on the proposed constellation scheme, a modulation selection algorithm based on adaptive constellation modulation and its corresponding detection algorithm are proposed, and a multi-subcarrier block combined adaptive constellation modulation transceiver design is proposed. Finally, the simulation results show that the proposed algorithm can improve the BER of the system. In chapter 4, the adaptive power allocation algorithm for indexed modulation OFDM systems is studied. Firstly, a power allocation algorithm based on minimum Euclidean distance criterion and a low complexity power allocation algorithm based on normalized Euclidean distance criterion are proposed. The two algorithms improve the bit error rate by adjusting the power between the carriers of each block. Then, based on the lower bound expression of reachable rate, a flexible power allocation method is proposed to adjust the resource between blocks. The algorithm achieves the goal of increasing the reachability rate by allocating the system resources evenly among the blocks. The fifth chapter summarizes the main contributions of this paper and points out the possible research direction in the future.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.53
【參考文獻】
相關碩士學位論文 前1條
1 余晶晶;無線鏈路自適應技術研究[D];北京交通大學;2007年
，本文編號：2310092
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