第五代移动通信新型调制及非正交多址传输技术研究及设计

发布时间：2018-07-14 21:43

【摘要】：移动通信从第一代(1G)发展到第四代(4G)的过程,是一个从声音传输到多媒体信息传输的过程。随着4G进入规模商用阶段,面向2020年的5G移动通信已成为全球研发热点。本课题依托国家高技术研究发展计划(863计划)重点基金资助项目“5G新型调制编码技术研究开发”,开展了第五代移动通信新型调制及非正交多址传输技术的研究及设计。本文首先分析了正交频分多址(OFDM)调制技术,重点分析了国外研究较多的滤波多音(FMT)技术的原理和关键技术,FMT技术通过滤波器组调制技术使各子信道之间的频谱不重叠,可以有效克服OFDM系统对频偏敏感的缺点,并且FMT系统可以像OFDM系统一样采用快速傅里叶变换(FFT),从而大幅降低系统实现的复杂度,但由于FMT子信道滤波器采用不满足理想重构条件的有限冲激响应滤波器,使FMT系统接收端需要复杂的均衡技术。在理论分析的基础上,本文通过搭建matlab仿真环境,完成了FMT仿真平台的设计、实现与优化。并且,通过对FMT系统收、发端公式的推导,设计和实现了FMT的高效传输结构,实现了滤波器的多相分解,降低了每个子滤波器的采样率,减少了系数和计算量。其次,本文针对OFDM和FMT的系统构成和优缺点,提出了新型的调制技术方案——基于循环前缀的滤波多音调制技术(CP-FMT)方案,推导出CP-FMT技术的时域收发机实现方法,通过使用数据循环成块的方法,有效的预防了接收信号的失真和发射信号的频谱泄露,实现了CP-FMT系统帧结构与3GPP-LTE帧结构的兼容,完成了基于CP-FMT调制方案仿真平台的搭建。仿真及理论分析结果表明,在理想信道估计条件下,CP-FMT调制技术提高了系统的分集增益,误码率性能更好,且多址干扰性能优于CP-OFDM系统。
[Abstract]:The development of mobile communication from the first generation (1G) to the fourth generation (4G) is a process from sound transmission to multimedia information transmission. With 4G entering the stage of scale commerce, 5 G mobile communication for 2020 has become a global research and development hotspot. Based on the National High Technology Research and Development Program (863 Program), the research and design of the new modulation and non-orthogonal multiple access transmission technology for the fifth generation mobile communication is carried out. The project is supported by the National High Technology Research and Development Program (863 Program), "Research and Development of 5G New Modulation and coding Technology". In this paper, the orthogonal Frequency Division multiple access (OFDM) modulation technology is first analyzed, and the principle and key technology of the filter Multitone (FMT) technique, which is widely studied abroad, are analyzed. The FMT technology makes the frequency spectrum of each subchannel not overlap through the filter bank modulation technology. It can effectively overcome the shortcomings of OFDM system which is sensitive to frequency offset, and FMT system can use fast Fourier transform (FFT) as OFDM system, thus greatly reducing the complexity of system implementation. However, because the FMT subchannel filter uses a finite impulse response filter which does not satisfy the ideal reconstruction condition, the receiver of FMT system needs complex equalization techniques. On the basis of theoretical analysis, the design, realization and optimization of matlab simulation platform are completed by setting up a simulation environment. In addition, the efficient transmission structure of FMT is designed and realized through the derivation of the formula of receiving and sending of FMT system, the polyphase decomposition of filter is realized, the sampling rate of each sub-filter is reduced, and the coefficient and computation are reduced. Secondly, aiming at the system structure, advantages and disadvantages of OFDM and FMT, a new modulation scheme, CP-FMT based on cyclic prefix, is proposed, and the realization method of CP-FMT in time domain transceiver is deduced. By using the method of data cycle block, the distortion of received signal and spectrum leakage of transmitted signal are effectively prevented, the compatibility of frame structure of CP-FMT system and 3GPP-LTE frame structure is realized, and the simulation platform based on CP-FMT modulation scheme is built. Simulation and theoretical analysis show that CP-FMT modulation improves the diversity gain and bit error rate of the system under the condition of ideal channel estimation, and the performance of multiple access interference (mai) is better than that of CP-OFDM.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5

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