宽带无线通信系统中的单载波频分多址技术研究
发布时间：2018-11-04 10:26
【摘要】：在长期演进(Long Term Evolution,LTE)技术的上行系统中,过高的峰均功率比要求系统具有极高的设计复杂度来预防非线性失真,这就要求系统内要拥有很大线性动态范围的功率放大器等器件,这就会大大提高用户终端的生产成本和削弱终端电池的续航能力,单载波频分多址(Single-Carrier Frequency Division Multiple Access,SC-FDMA)系统是在正交频分多址(Orthogonal Frequency Division Multiple Access,OFDMA)系统的基础上发展演变而来,结合了单载波频域均衡(Single-Carrier Frequency Domain Equalizer,SC-FDE)技术和OFDMA系统的优点,表现出单载波峰均功率比(Peak to Average Power Ratio,PAPR)极低的性质,成功的避免了上述问题,最终成为LTE上行链路所选择的多址接入方案。本文主要就现代无线通信系统中单载波频分多址系统的子载波分配模式,迫零(Zero Forcing,ZF),最小均方误差(Minimum Mean Square Error,MMSE),判决反馈均衡(Decision Feedback Equalizer,DFE)以及Turbo均衡等检测算法误码率性能,PAPR性能,带外泄漏性能等方面进行了研究和仿真。本文具体内容安排如下:第一章介绍了LTE上下行系统的一些基本概念和原理,并给出了本文的主要内容安排。第二章主要介绍SC-FDE技术,给出其系统原理,并介绍几种频域均衡技术,最后给出了SC-FDE系统频域均衡算法仿真结果。第三章主要介绍SC-FDMA的系统原理,分别介绍SC-FDMA的三种分配模式,并详细分析灵活性较高的新型块交织频分多址(Block-Interleaved Frequency Division Multiple Access,B-IFDMA)系统,仿真用户数,块子载波数,交织程度对系统性能影响,给出三种单载波频分多址系统结合ZF,MMSE和DFE以及Turbo均衡算法后的误码率性能仿真结果,最后还给出了集中式频分多址(Localized Frequency Division Multiple Access,LFDMA)系统的两种跳频方法的系统原理和性能仿真结果。第四章重点研究了SC-FDMA系统的相关特性,包括三种分配模式下的PAPR,加频率偏移性能仿真,并成功将N-continuous技术引用到SC-FDMA系统中,给出了优化后的带外泄漏性能和误码率(Bit Error Rate,BER)性能仿真结果。论文的最后一章是对本文贡献的归纳,并给出后续研究工作的建议,分析未来SC-FDMA系统可能的研究方向。
[Abstract]:In the uplink system of long term evolving (Long Term Evolution,LTE, too high PAPR requires a high design complexity to prevent nonlinear distortion. This requires a large linear dynamic range of power amplifiers and other devices in the system, which will greatly increase the production cost of user terminals and weaken the terminal battery capacity, single carrier frequency division multiple access (Single-Carrier Frequency Division Multiple Access,) SC-FDMA) system is developed on the basis of orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access,OFDMA) system. It combines the advantages of single carrier frequency domain equalization (Single-Carrier Frequency Domain Equalizer,SC-FDE) technology and OFDMA system. The PAPR (single carrier peak-to-average power ratio) (Peak to Average Power Ratio,PAPR) is very low, which avoids the problem mentioned above and becomes the multiple access scheme for LTE uplink. In this paper, the subcarrier allocation mode, zero forcing (Zero Forcing,ZF), minimum mean square error (Minimum Mean Square Error,MMSE) and decision feedback equalization (Decision Feedback Equalizer,) for single carrier frequency division multiple access systems in modern wireless communication systems are discussed. DFE), Turbo equalization and other detection algorithms, such as bit error rate (BER) performance, PAPR performance, out-of-band leakage performance and so on, are studied and simulated. The main contents of this paper are as follows: the first chapter introduces some basic concepts and principles of LTE uplink and downlink system, and gives the main contents of this paper. The second chapter mainly introduces the SC-FDE technology, gives the system principle, and introduces several frequency domain equalization techniques. Finally, the simulation results of the SC-FDE system frequency domain equalization algorithm are given. The third chapter mainly introduces the system principle of SC-FDMA, introduces the three distribution modes of SC-FDMA, and analyzes in detail the new block interleaving frequency division multiple access (Block-Interleaved Frequency Division Multiple Access,B-IFDMA) system with high flexibility and the number of simulation users. The number of block subcarriers and the degree of interleaving affect the performance of the system. The simulation results of BER performance of three single-carrier frequency division multiple access systems combined with ZF,MMSE, DFE and Turbo equalization algorithm are given. Finally, the centralized frequency division multiple access (Localized Frequency Division Multiple Access, is given. LFDMA) the system principle and performance simulation results of two frequency hopping methods. The fourth chapter focuses on the related characteristics of SC-FDMA system, including the simulation of PAPR, plus frequency offset performance under three allocation modes, and successfully applies N-continuous technology to SC-FDMA system. The simulation results of optimized out-of-band leakage performance and bit error rate (Bit Error Rate,BER) performance are given. The last chapter is a summary of the contribution of this paper, and gives some suggestions for further research work, and analyzes the possible research direction of SC-FDMA system 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】：2014
【分类号】：TN929.5
本文编号：2309547
[Abstract]:In the uplink system of long term evolving (Long Term Evolution,LTE, too high PAPR requires a high design complexity to prevent nonlinear distortion. This requires a large linear dynamic range of power amplifiers and other devices in the system, which will greatly increase the production cost of user terminals and weaken the terminal battery capacity, single carrier frequency division multiple access (Single-Carrier Frequency Division Multiple Access,) SC-FDMA) system is developed on the basis of orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access,OFDMA) system. It combines the advantages of single carrier frequency domain equalization (Single-Carrier Frequency Domain Equalizer,SC-FDE) technology and OFDMA system. The PAPR (single carrier peak-to-average power ratio) (Peak to Average Power Ratio,PAPR) is very low, which avoids the problem mentioned above and becomes the multiple access scheme for LTE uplink. In this paper, the subcarrier allocation mode, zero forcing (Zero Forcing,ZF), minimum mean square error (Minimum Mean Square Error,MMSE) and decision feedback equalization (Decision Feedback Equalizer,) for single carrier frequency division multiple access systems in modern wireless communication systems are discussed. DFE), Turbo equalization and other detection algorithms, such as bit error rate (BER) performance, PAPR performance, out-of-band leakage performance and so on, are studied and simulated. The main contents of this paper are as follows: the first chapter introduces some basic concepts and principles of LTE uplink and downlink system, and gives the main contents of this paper. The second chapter mainly introduces the SC-FDE technology, gives the system principle, and introduces several frequency domain equalization techniques. Finally, the simulation results of the SC-FDE system frequency domain equalization algorithm are given. The third chapter mainly introduces the system principle of SC-FDMA, introduces the three distribution modes of SC-FDMA, and analyzes in detail the new block interleaving frequency division multiple access (Block-Interleaved Frequency Division Multiple Access,B-IFDMA) system with high flexibility and the number of simulation users. The number of block subcarriers and the degree of interleaving affect the performance of the system. The simulation results of BER performance of three single-carrier frequency division multiple access systems combined with ZF,MMSE, DFE and Turbo equalization algorithm are given. Finally, the centralized frequency division multiple access (Localized Frequency Division Multiple Access, is given. LFDMA) the system principle and performance simulation results of two frequency hopping methods. The fourth chapter focuses on the related characteristics of SC-FDMA system, including the simulation of PAPR, plus frequency offset performance under three allocation modes, and successfully applies N-continuous technology to SC-FDMA system. The simulation results of optimized out-of-band leakage performance and bit error rate (Bit Error Rate,BER) performance are given. The last chapter is a summary of the contribution of this paper, and gives some suggestions for further research work, and analyzes the possible research direction of SC-FDMA system 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】：2014
【分类号】：TN929.5
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