基于频谱效率提升的FMT系统实现方法

Implementation of the filtered multi-tone based on the improved spectral efficiency

本文基于快速卷积方案实现滤波多音调制(filtered multi-tone,FMT)系统,可以对子载波的中心频率及宽度进行灵活配置.针对传统FMT系统频谱效率低下的问题,提出以频率点为单位引入频谱重叠的新型FMT系统(overlapped FMT,O-FMT)研究方法.通过实验方法分析了O-FMT系统中重叠因子、频率点重叠点数及滚降因子与系统性能间的关系.仿真结果证明该方法可以同时处理多种波形,并能通过几个参数的最优配置满足多种业务场景对系统运算复杂度、频谱利用率、均方误差等不同的性能需求.

This paper proposes a frequency domain implementation method for the filtered multi-tone（FMT） based on fast convolution called FC-FMT, which can adjust the center frequencies flexibly. Aiming at the low spectral efficiency of the FMT, spectral-overlapping in frequency bins is introduced in FC-FMT called Overlapped FC-FMT（O-FMT）. We then analyze the relationships between the overlap factor, overlap frequency bins, roll-off factor, and system performance using models and simulations. The simulation results show that O-FMT can be used to simultaneously process multiple waveforms. It also has superiority in meeting a variety of transport requirements, such as computation complexity, spectrum efficiency, and mean squared error, for multiple services due to simple parameters.