OFDM仿真包括信号源,卷积码编码，交织，qpsk调制，IFFT，组帧，上采样，通过FIR滤波器 通过高斯信道，再经过低通FIR滤波器，下采样，拆帧，FFT，qpsk解调，接收数据；计算误比特率-OFDM simulation including the signal source, sampling convolutional encoding, interleaving, QPSK modulation, IFFT, frame,, through the FIR filter　through Gauss channel, and then through the low pass FIR filter, sampling, demolition of frame, FFT, QPSK demodulation, the received data　bit error rate calculation