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, fr a me,, through the FIR filter　through Gauss channel, and then through the low pass FIR filter, sampling, demolition of fr a me, FFT, QPSK demodulation, the received data　bit error rate calculation