计算机科学 ›› 2018, Vol. 45 ›› Issue (8): 88-93.doi: 10.11896/j.issn.1002-137X.2018.08.016
王磊, 梁燕, 孙尚勇, 王光宇
WANG Lei, LIANG Yan, SUN Shang-yong, WANG Guang-yu
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 Ave-rage 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MC-TDMA。
中图分类号:
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