A numerical simulation method based on inverse discrete Fourier transform(IDFT)is presented for generating Gaussian rough surface with a desired autocorrelation function(ACF). The probability density function of the h...A numerical simulation method based on inverse discrete Fourier transform(IDFT)is presented for generating Gaussian rough surface with a desired autocorrelation function(ACF). The probability density function of the height distribution of the generated Gaussian surface and the root-mean-square height of the rough surface are also considered. It is found that the height distribution of the generated surface follows the Gaussian distribution, the deviation of the root-mean-square height of the modeled rough surface from the desired value is smaller than that of Patir's method, and the autocorrelation function of the modeled surface is also in good agreement with the desired autocorrelation function. Compared with Patir's method, the modeled surface generated by the IDFT method is in better agreement with the desired autocorrelation function, especially when the correlation length is relatively large.展开更多
OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)是第四代移动通信技术的核心技术。首先简要介绍了OFDM的基本原理,分析了两种OFDM信号生成方法,建立了系统仿真模型,对两种信号实现方法进行了分析比较。并基于所建模型...OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)是第四代移动通信技术的核心技术。首先简要介绍了OFDM的基本原理,分析了两种OFDM信号生成方法,建立了系统仿真模型,对两种信号实现方法进行了分析比较。并基于所建模型,给出了OFDM信号频谱及解码星座图。仿真结果表明,所建模型很好地完成OFDM的实现与解调。展开更多
基金Supported by the National Basic Research Program of China("973"Program,No.2013CB632305)
文摘A numerical simulation method based on inverse discrete Fourier transform(IDFT)is presented for generating Gaussian rough surface with a desired autocorrelation function(ACF). The probability density function of the height distribution of the generated Gaussian surface and the root-mean-square height of the rough surface are also considered. It is found that the height distribution of the generated surface follows the Gaussian distribution, the deviation of the root-mean-square height of the modeled rough surface from the desired value is smaller than that of Patir's method, and the autocorrelation function of the modeled surface is also in good agreement with the desired autocorrelation function. Compared with Patir's method, the modeled surface generated by the IDFT method is in better agreement with the desired autocorrelation function, especially when the correlation length is relatively large.
文摘OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)是第四代移动通信技术的核心技术。首先简要介绍了OFDM的基本原理,分析了两种OFDM信号生成方法,建立了系统仿真模型,对两种信号实现方法进行了分析比较。并基于所建模型,给出了OFDM信号频谱及解码星座图。仿真结果表明,所建模型很好地完成OFDM的实现与解调。
