通信OFDM传输，信号通过加入导频，循环前缀，交织变换，经过瑞丽信道，通过QPSK解调，译码，判断误码率。(Communication OFDM transmission, the signal by adding pilots, cyclic prefix, interleaved transform, after Rayleigh channel, demodulated by QPSK, decoding, to determine the bit error rate.)