索引调制OFDM系统链路自适应技术研究与仿真
发布时间：2018-11-04 14:28
【摘要】：随着无线通信技术的不断发展,人们对下一代移动通信系统提出了越来越高的要求。在这样的时代背景下,具有低峰均比,强频偏对抗能力和高能量效率的索引调制OFDM系统(Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM)逐渐引起学者们的关注。为了进一步提高索引调制OFDM的传输性能,本文从传输性能出发,对索引调制OFDM系统的误码率和可达速率进行了理论分析和推导,并进一步将链路自适应技术运用于索引调制OFDM系统中,分别提出了以优化系统误码率和可达速率为目的的自适应调制算法和自适应功率分配算法。具体工作可以总结如下:第一章首先介绍了索引调制OFDM系统的发展历程,基本原理和优缺点,阐述了索引调制OFDM系统的研究现状,并对本文的主要研究内容进行概括性总结。第二章首先给出了索引调制OFDM系统的基本模型,通过理论推导和数值仿真分析了理想信道条件下索引调制OFDM系统的误码率和可达速率,并进一步分析了非理想信道估计下索引调制OFDM系统的误码性能及其影响因素。最后,在已有理想信道估计可达速率的基础上,分析信道估计误差对它的影响,并给出理论推导和仿真性能比较。第三章研究了索引调制OFDM系统的自适应调制技术。首先讨论索引调制OFDM系统自适应调制的基本原理及优化准则,并通过分析调制星座图对误码率的影响,提出一种针对索引调制OFDM系统自适应调制的星座图设计准则。基于所提星座图设计方案,提出了一种基于自适应星座点调制的调制方式选择算法及相应的检测算法,并进一步提出了一种多子载波块联合自适应星座点调制的收发端设计。最后,通过仿真验证所提算法均能达到提升系统误码率的目的。第四章研究了索引调制OFDM系统的自适应功率分配算法。首先,以误码率性能为优化目标,提出了一种基于最小欧氏距离准则的功率分配算法和一种基于归一化欧氏距离准则的低复杂度功率分配算法,两种算法通过在每个块的各个载波之间调节功率达到提升系统误码率的目的。然后,从可达速率性能出发,基于可达速率下界表达式提出了一种在块与块之间灵活调节资源的功率分配方式,该算法通过在各块之间均衡分配系统资源以到达提升系统可达速率的目的。第五章总结本文主要贡献,并指出未来可能的研究方向。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.53
本文编号：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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.53
【参考文献】
相关硕士学位论文 前1条
1 余晶晶;无线链路自适应技术研究[D];北京交通大学;2007年
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