一种基于离散辛傅里叶变换的多载波调制方法
首发时间:2017-10-26
摘要:本文介绍一种基于离散辛傅里叶变换(DSFT)的多载波调制方法,该方法建立了与时频域坐标系统不同的延迟-多普勒坐标系。该方案通过将正交频分复用(OFDM)的调制符号所经历的衰落时变信道转变为与时间无关的信道结构,从而能够获得时频域分集。时频域的获得使得系统在对抗多普勒方面有良好的表现。仿真结果显示,在高多普勒信道条件下(例如,500km/h),基于DSFT的多载波方案比OFDM系统有5dB的增益甚至更高。
关键词: DSFT 二维扩展 延迟-多普勒 时间频率分集增益
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A Multi-Carrier Modulation method based on Discrete Symplectic Fourier Transform
Abstract:In this paper, a new multi-carrier modulation method based on Discrete Symplectic Fourier Transform is introduced. This method sets up a new coordinate system named Delay-Doppler coordinate system, which is different from the original time-frequency coordinate system. The scheme can convert the fading, time-varying wireless channel experienced by Orthogonal Frequency Division Multiplexing(OFDM) symbols into a time-irrelevant channel. Then the system can attain the diversity over time and frequency domain. The capability of exploiting the diversity of the channel makes the system perform well in high speed scenarios. Simulation results show that even at very high speed(500km/h), the new method can achieve 5dB higher than the OFDM system.
Keywords: DSFT Two-dimensional Spreading Delay-Doppler time-frequency diversity gain
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一种基于离散辛傅里叶变换的多载波调制方法
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