中文说明：本文通过MATLAB编程实现正交频分复用（OFDM）的系统仿真，系统采用卷积码和交织码级连的差错控制编码。以高斯噪声信道和电力线信道为例，用本仿真系统分别计算出了无差错控制编码和有差错控制编码情况下误码率与信噪比的关系。结果表明，加入差错控制编码使误码率达到10-3时对信噪比的要求有很大减小。系统误码率随信噪比增加以近似二次曲线下降或部分近似二次曲线下降，以不同系数的二次曲线分别进行模拟，可以控制差值在0.005~0.02范围内。
English Description：
In this paper, orthogonal frequency division multiplexing (OFDM) system simulation is realized by MATLAB programming. The system adopts convolutional code and interleaved code concatenation error control coding. Taking Gaussian noise channel and power line channel as examples, the relationship between BER and SNR in the case of no error control coding and error control coding is calculated respectively. The results show that the requirement of SNR is greatly reduced when the BER reaches 10-3 by adding error control coding. With the increase of signal-to-noise ratio, the bit error rate of the system decreases in the form of approximate conic curve or partial approximate conic curve, and the difference can be controlled in the range of 0.005 ~ 0.02 by simulating the conic curves with different coefficients.