Cooley-TukeyFFT算法在LTE系统中的研究与应用

快速傅里叶变换（FFT）作为数字信号处理的核心技术,使离散傅里叶变换（DFT）的运算时间缩短了几个数量级,并在LTE系统中有着重要的应用。在LTE系统中,上行链路采用单载波频分多址技术（SC-FDMA）,下行链路采用正交频分多址技术（OFDMA）。在这两种技术实现的过程中,都采用了离散傅里叶变换进行处理,而直接计算DFT的计算量太大。通过对LTE系统中Cooley-Tukey FFT算法进行了研究,同时利用Verilog HDL描述的方式实现了不定点FFT系统设计,并以FPGA芯片virtex5为硬件平台,进行了仿真、综合等工作,仿真结果表明其计算结果达到了一定的精度。

The Cooley-Tukey FFT Algorithm Research and Application in LTE System

Fast fourier transform is the core technique of DSP,and its performing time is shorter a few stages than DFTs,and in the LTE system FFT has important applications.In the process of LTE system design,in order to meet the performance requirements of LTE,the uplink adopt the single-carrier frequency division multiple access technolog,the downlink adopt the orthogonal frequency division multiple access technolog.in the process of achieving the LTE,have adopted DFT or FFT approach.However,calculation of direct calculation the DFT,is proportional to the square of the length of N.Herefore,first introduce and study the Cooley-Tukey FFT algorithms,and realizes a variable points FFT system by using verilog HDL.Then it finishes simulation and synthesis of the system on virtex5.The simulation indicates that the result of calculation can reach equivalent precision.