中文说明：
ofdm信道特性OFDM信道传输模拟器的信道特性信道传输模拟器输入：sig2-噪声方差Mt-Tx天线数Mr-Rx天线数x-复输入符号矢量（对于MIMO，这是一个矩阵，其中，每列是在单个时间实例中天线输出的值）H-频率选择性信道-以块Toeplitz形式表示用于MIMO传输N-在OFDM帧输出中传输的符号数：y-信道输出的向量（再次用于MIMO的矩阵，就像x矩阵）创建噪声矢量序列（每行是不同的天线，每列是不同的时间索引）注意：噪声在空间和时间上都是白色的
English Description：
OFDM channel characteristics channel characteristics of OFDM channel transmission simulator input of channel transmission simulator: sig2 noise variance MT TX number of antennas Mr RX number of antennas x-complex input symbol vector (for MIMO, this is a matrix, where, Each column is the value of the antenna output in a single time instance) h-frequency selective channel - in the form of block Toeplitz for MIMO transmission n-the number of symbols transmitted in the OFDM frame output: y-the vector of the channel output (again used for MIMO matrix, like x matrix) creates a noise vector sequence (each row is a different antenna, Note: noise is white in space and time