多载波时分多址及其快速卷积实现  

Multicarrier Time Division Multiple Access and System Implementation Based on Fast Convolution Scheme

作　　者：王磊[1] 梁燕[1] 孙尚勇[1] 王光宇[1] WANG Lei;LIANG Yan;SUN Shang-yong;WANG Guang-yu(Chongqing Key Laboratory of Mobile Communication Technology,Chongqing University of Postsand Telecommunications,Chongqing 400065,Chin)

机构地区：[1]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065

出　　处：《计算机科学》2018年第8期88-93,130,共7页Computer Science

基　　金：国家科技重大专项(2016ZX03001010);重庆市教委科学技术研究项目(KJ1704098)资助

摘　　要：为了解决正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统峰均功率比(Peak Average Power Ratio,PAPR)过高以及对频率偏移敏感的问题,提出了多载波时分多址(Multicarrier Time Division Multiple Access,MC-TDMA),其采用交织映射和改进离散傅里叶变换(Modified Discrete Fourier Transform,MDFT)滤波器组技术,可以有效地降低系统的峰均功率比,增强系统的抗频率偏移的性能,并且可以同时用于上行和下行通信中。文中分别从交织映射和MDFT滤波器组两个方面研究了MC-TDMA系统的实现。为了增强系统的灵活性,采用快速卷积方案实现MC-TDMA,使其能够更好地应对5G复杂的应用场景。分别从系统结构、频域采样滤波器等方面对系统进行设计,并且对快速卷积MC-TDMA系统的性能进行仿真,并与MC-TDMA进行比较。研究表明,使用快速卷积方案实现的MC-TDMA系统,通过灵活地调整重叠因子、抽取因子和滚降因子等参数,可以使其性能优于MCTDMA。In order to solve the problems that peak average power ratio（PAPR）of orthogonal frequency division multiplexing（OFDM）is too high,and it is sensitive to the frequency offset,a multicarrier time division multiple access（MCTDMA）scheme was put forward in this paper.The interleaving mapping and modified discrete Fourier transform（MDFT）filter banks technology can effectively reduce the peak average power ratio（PAPR）,and enhance the performance of system against frequency offset.MC-TDMA can be used in the uplink and downlink communication.MC-TDMA was implemented from interleaving mapping and MDFT filter banks in this paper.In order to enhance the flexibility of system,fast convolution scheme was used to achieve MC-TDMA,so that it can better deal with the 5G complex application scenarios.The fast convolution system MC-TDMA was designed from the aspects of system structure and frequency domain sampling filter.The performance of fast convolution MC-TDMA system was simulated and compared with MCTDMA.The results show that the MC-TDMA system can be realized by the fast convolution scheme,and the performance of the system is better than that of the MC-TDMA system by flexibly adjusting the parameters such as the overlap factor,the decimation factor and the roll-off factor.

关 键 词：多载波时分多址 快速卷积 重叠因子 抽取因子 滚降因子 

分 类 号：TN911[电子电信—通信与信息系统]