中文说明：OFDM的仿真，涉及信噪比取值，dB为单位，设置FFT长度，设置一个帧结构中OFDM信号的个数，设置并行传输的子载波个数，设置保护时隙的长度，产生0,1随机数列，符号个数为para*2*Ns，串并转换，将随机产生的二进制矩阵变换为行数为para，列数为2*Ns的矩阵，通过傅里叶反变换，将频域数据转换
English Description：
OFDM simulation, involving the SNR value dB unit, set the FFT length, set the number of OFDM signals in a frame structure, set the number of subcarriers transmitted in parallel, sets the length of protected time slots,0, 1 random numbers, number symbol para*2*Ns, string and converted, random binary matrix transformation for row count of para, the number of columns for 2*Ns matrices, by inverse Fourier transform, frequency-domain data conversion